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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549





Form 10-K





ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF

THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended
December 31, 2010

Commission File Number 001-08106





LOGO

MasTec, Inc.

(Exact Name of Registrant as Specified in Its Charter)







|                                                               |  |                                     
|-------------------------------------------------------------- |  | ------------------------------------
|Florida                                                        |  | 65-0829355                          
|(State or Other jurisdiction of
Incorporation or Organization) |  | (I.R.S. Employer Identification No.)
|                                                               | 
|800 S. Douglas Road, 12th Floor,                               |  |                                     
|Coral Gables, FL                                               |  | 33134                               
|(Address of Principal Executive Offices)                       |  | (Zip Code)                          

(305)
599-1800

(Registrants Telephone Number, Including Area Code)

Securities registered pursuant to Section 12(b) of the Exchange Act:



|                              |  |                                          
|----------------------------- |  | -----------------------------------------
|Title of Each Class           |  | Name of Each Exchange on Which Registered
|Common Stock, $0.10 Par Value |  | New York Stock Exchange                  

Securities registered pursuant to Section 12(g) of the Exchange Act: None





Indicate by check mark if the registrant is a well-known seasoned issuer; as defined in rule 405 of the Securities
Act.    Yes  x    No   ̈

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the
Act.    Yes   ̈    No  x

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the
Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90
days.    Yes  x    No   ̈

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every
Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such
files).    Yes   ̈    No   ̈

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (Section 229.405 of this chapter)
is not contained herein, and will not be contained, to the best of registrants knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  x

Indicate by check mark if the registrant is a large accelerated filer, an
accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of large accelerated filer, accelerated filer, and smaller reporting company in Rule 12b-2 of the Exchange Act.
(Check one):



|                        |  |   |  |                           |  |  
|----------------------- |  | - |  | ------------------------- |  | -
|Large accelerated filer |  |  ̈ |  | Accelerated filer         |  | x
|                        |  |   | 
|Non-accelerated filer   |  |  ̈ |  | Smaller reporting company |  |  ̈

Indicate by check mark whether the registrant is shell company (as defined in Rule 12b-2 of the
Act.)    Yes   ̈    No  x

The aggregate market value of the registrants outstanding common stock held by non-affiliates of the registrant computed by
reference to the price at which the common stock was last sold as of the last business day of the registrants most recently completed second fiscal quarter was $516,382,533 (based on a closing price of $9.40 per share for the registrants
common stock on the New York Stock Exchange on June 30, 2010).

There were 78,246,126 shares of common stock outstanding
as of February 21, 2011.

The registrants definitive proxy statement to be filed with the Securities and Exchange
Commission pursuant to Regulation 14A for the 2011 annual meeting of shareholders is incorporated by reference in Part III of this Form 10-K to the extent stated herein.









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TABLE OF CONTENTS



|           |  |                                                                                                                  |     |  |    | 
|---------- |  | ---------------------------------------------------------------------------------------------------------------- | --- |  | -- | 
|           |  | Page                                                                                                             |    
|Part I     |  |                                                                                                                  | 4   | 
|Item 1     |  | Business                                                                                                         |     |  | 4  | 
|Item 1A    |  | Risk Factors                                                                                                     |     |  | 14 | 
|Item 1B    |  | Unresolved Staff Comments                                                                                        |     |  | 29 | 
|Item 2     |  | Properties                                                                                                       |     |  | 29 | 
|Item 3     |  | Legal Proceedings                                                                                                |     |  | 29 | 
|Item 4     |  | Submission of Matters to a Vote of Security Holders                                                              |     |  | 30 | 
|Part II    |  |                                                                                                                  | 30  | 
|Item 5     |  | Market for the Registrants Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities |     |  | 30 | 
|Item 6     |  | Selected Financial Data                                                                                          |     |  | 32 | 
|Item 7     |  | Managements Discussion and Analysis of Financial Condition and Results of Operations                            |     |  | 33 | 
|Item 7A    |  | Quantitative and Qualitative Disclosures About Market Risk                                                       |     |  | 52 | 
|Item 8     |  | Financial Statements and Supplementary Data                                                                      |     |  | 54 | 
|Item 9     |  | Changes in and Disagreements with Accountants on Accounting and Financial Disclosure                             |     |  | 96 | 
|Item 9A    |  | Controls and Procedures                                                                                          |     |  | 96 | 
|Item 9B    |  | Other Information                                                                                                |     |  | 98 | 
|Part III   |  |                                                                                                                  | 98  | 
|Item 10    |  | Directors, Executive Officers and Corporate Governance                                                           |     |  | 98 | 
|Item 11    |  | Executive Compensation                                                                                           |     |  | 98 | 
|Item 12    |  | Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters                   |     |  | 98 | 
|Item 13    |  | Certain Relationships and Related Transactions, and Director Independence                                        |     |  | 99 | 
|Item 14    |  | Principal Accounting Fees and Services                                                                           |     |  | 99 | 
|Part IV    |  |                                                                                                                  | 99  | 
|Item 15    |  | Exhibits and Financial Statement Schedules                                                                       |     |  | 99 | 
|Signatures |  |                                                                                                                  | 104 | 



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Cautionary Statement Regarding Forward-Looking Statements

We are making this statement pursuant to the safe harbor provisions for forward-looking statements described in the Private Securities
Litigation Reform Act of 1995. We make statements in this Annual Report on Form 10-K and in the documents that we incorporate by reference into this Annual Report that are forward-looking. When used in this Annual Report or in any other
presentation, statements which are not historical in nature, including the words anticipate, estimate, could, should, may, plan, seek, expect,
believe, intend, target, will, project and variations of these words and negatives thereof and similar expressions are intended to identify forward-looking statements. They also include
statements regarding:



| |  |  | our future growth and profitability;
| | - |  | ------------------------------------



| |  |  | our competitive strengths; and
| | - |  | ------------------------------



| |  |  | our business strategy and the trends we anticipate in the industries and economies in which we operate.
| | - |  | -------------------------------------------------------------------------------------------------------

These forward-looking statements are based on our current expectations and are subject to a number of risks, uncertainties and
assumptions. These statements are not guarantees of future performance and are subject to risks, uncertainties and other factors, some of which are beyond our control, are difficult to predict, and could cause actual results to differ materially
from those expressed or forecasted in the forward-looking statements. Important factors that could cause actual results to differ materially from those in forward-looking statements include:



| |  |  | market conditions, technical and regulatory changes that affect us or our customers industries;
| | - |  | ------------------------------------------------------------------------------------------------



| |  |  | further or continued economic downturns, reduced capital expenditures, reduced financing availability, customer consolidation and technological and
regulatory changes in the industries we serve;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the highly competitive nature of our industry;
| | - |  | ----------------------------------------------



| |  |  | the effect of state and federal regulatory initiatives, including costs of compliance with existing and future environmental requirements;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the impact of the American Recovery and Reinvestment Act of 2009 and any federal, state or local incentives or regulations affecting renewable energy,
electrical transmission, broadband and related projects and expenditures;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | trends in electricity, oil and natural gas prices;
| | - |  | --------------------------------------------------



| |  |  | the timing and extent of fluctuations in geographic, weather, equipment and operational factors affecting the industries in which we operate;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | risks associated with operating in international markets, which could restrict our ability to expand globally and harm our business and prospects or
any failure to comply with laws applicable to our foreign activities;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our ability to estimate the costs associated with our fixed price and other contracts and performance on such projects;
| | - |  | -----------------------------------------------------------------------------------------------------------------------



| |  |  | our ability to replace non-recurring projects with new projects;
| | - |  | ----------------------------------------------------------------



| |  |  | the ability of our customers, including our largest customers, to terminate or reduce the amount of work, or in some cases prices paid for services on
short or no advance notice under our contracts;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our dependence on a limited number of customers;
| | - |  | ------------------------------------------------



| |  |  | the impact of any unionized workforce, or related labor organization efforts, on our operations, including labor availability and relations;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | liabilities associated with multiemployer union pension plans, including underfunded liabilities, for our operations that employ unionized workers;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our ability to retain qualified personnel and key management, including from acquired businesses, enforce any noncompetition agreements, integrate
acquired businesses within expected timeframes and achieve the revenue, cost savings and earnings levels from such acquisitions at or above the levels projected;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our ability to attract and retain qualified managers and skilled employees;
| | - |  | ---------------------------------------------------------------------------



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| |  |  | the outcome of our plans for future operations, growth and services, including business development efforts, backlog and acquisitions;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our ability to obtain performance and surety bonds;
| | - |  | ---------------------------------------------------



| |  |  | restrictions imposed by our credit facility, senior notes, convertible notes and any future loans or securities;
| | - |  | ----------------------------------------------------------------------------------------------------------------



| |  |  | increases in fuel, maintenance, materials, labor and other costs;
| | - |  | -----------------------------------------------------------------



| |  |  | any material changes in estimates for legal costs or case settlements or adverse determinations on any claim, lawsuit or proceeding;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the adequacy of our insurance, legal and other reserves and allowances for doubtful accounts;
| | - |  | ---------------------------------------------------------------------------------------------



| |  |  | liquidity issues related to our investment in securities available for sale;
| | - |  | ----------------------------------------------------------------------------



| |  |  | any exposure related to our divested state Department of Transportation projects and assets;
| | - |  | --------------------------------------------------------------------------------------------



| |  |  | any dilution or stock price volatility that shareholders may experience in connection with shares we may issue as consideration for earn-out
obligations or as purchase price consideration in connection with past or future acquisitions, or as a result of conversions of convertible notes or other stock issuances;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our ability to settle conversions of our convertible notes in cash due to contractual restrictions, including those contained in our credit facility,
and the availability of cash; and
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the other factors referenced in this Annual Report, including, without limitation, under Item 1. Business, Item 1A Risk
Factors, Item 7. Managements Discussion and Analysis of Financial Condition and Results of Operations and other factors detailed from time to time in the reports and other filings we make with the Securities and Exchange
Commission.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

We believe these forward-looking statements are reasonable; however, you should not place undue
reliance on any forward-looking statements, which are based on current expectations. Furthermore, forward-looking statements speak only as of the date they are made. If any of these risks or uncertainties materialize, or if any of our underlying
assumptions are incorrect, our actual results may differ significantly from the results that we express in, or imply by, any of our forward-looking statements. These and other risks are detailed in this Annual Report on Form 10-K, in the documents
that we incorporate by reference into this Annual Report on Form 10-K and in other documents that we file with the Securities and Exchange Commission. We do not undertake any obligation to publicly update or revise these forward-looking statements
after the date of this Annual Report on Form 10-K to reflect future events or circumstances, except as required by applicable law. We qualify any and all of our forward-looking statements by these cautionary factors.

PART I



|ITEM 1. | BUSINESS
|------- | --------

Overview

We are a leading national infrastructure construction company operating mainly throughout the United States across a range of industries.
Our activities include, but are not limited to, the engineering, building, installation, maintenance and upgrade of energy, communication and utility infrastructure, including: electrical utility transmission and distribution, wind farms, solar
farms, other renewable energy, natural gas and petroleum pipeline infrastructure, wireless, wireline and satellite communications, industrial infrastructure and water and sewer systems. Our customers are primarily in the utility, communications and
government industries.

Including our predecessor companies, we have been in business for more than 80 years. We offer our
services primarily under the MasTec service mark and operate through a network of over 260 locations and approximately 9,400 employees as of December 31, 2010. We have consistently ranked among the top specialty contractors by Engineering
News-Record over the past five years.

We serve a diversified domestic customer base, and our top ten
customers include some of the largest communications, utility and pipeline companies in the United States, including
DIRECTV®, AT&T, El Paso Corporation, Enbridge, Edison Mission Energy, Tenaska Energy, Duke Energy, Talisman
Energy, Great River Energy and CenturyLink. We have longstanding relationships with many customers and often provide services under multi-year master service agreements and other service agreements.



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We have actively pursued a diversification and expansion strategy since 2007. This strategy
has enabled us to deepen our presence in key markets and expand our service offerings through several complementary acquisitions and investments in the wind energy, wireless, oil and natural gas pipeline, heavy industrial and high voltage
transmission markets, among others. In addition to integration and growth opportunities associated with acquired businesses and the corresponding end markets, we continue to seek new opportunities in traditional business areas, such as
telecommunications and install-to-the-home services.

For additional information and recent developments refer to Part II,
Item 7, Managements Discussion and Analysis of Financial Condition and Results of Operations.

Industry Trends

Our industry is composed of national, regional and local companies that provide outsourced infrastructure services to
customers in the utilities, pipeline and communications industries as well as to government customers.

We believe the
following industry trends impact demand for our services:

Increased Production and Demand for Natural Gas

Natural gas is one of the cleanest burning hydrocarbon fuels and is in demand because of its relative cost advantage
over other fossil fuel sources. The level of natural gas pipeline construction activity in the United States is expected to increase due to the desire to promote domestic sources of energy. According to the 2010 North American Electric Reliability
Corporation (NERC, which is the organization of U.S. electric grid operators), Long-Term Reliability Assessment, natural gas has become the predominant option for new build power generation as gas-fired plants are typically easy to
construct, require little lead-time, emit less carbon dioxide, and are generally less expensive to construct when compared to coal and oil generation facilities. In its report, NERC notes that certain states have placed or are expected to place a
moratorium on building new coal plants, citing environmental and emissions concerns as justification. These trends are anticipated to continue over the next several years, further increasing the expected number of new build natural gas plants.

According to NERCs 2010 report, development of unconventional gas production in North America has the potential to
increase availability of gas supply in the future. Higher estimates of available North American natural gas come from access to unconventional sources such as shale formations, which previously had been difficult and expensive to reach. Gas in shale
formations represents an estimated two-thirds of North Americas potentially recoverable gas reserves. NERC estimates that natural gas-fired on-peak capacity will exceed coal-fired on-peak capacity during 2011. Coupled with higher availability
of unconventional natural gas supplies, developers could substantially increase gas-fired plant additions, changing the North American fuel mix while increasing dependency on a single, largely domestic fuel type. Natural gas consumption is at
all-time highest levels and is expected to increase over the next ten years. The U.S Department of Energy (DOE) expects 900 of the next 1,000 U.S. power plants to be natural gas powered, and according to the Federal Energy Regulatory
Commissions (FERC) Major Pipeline Project Report, there are almost 4,000 miles of major pipeline projects pending as of February 2011.

We believe that as new unconventional shale gas reserves are developed, the demand for additional gas transport projects will grow. We also believe that U.S. energy policy goals will continue to promote
domestic sources of energy in order to reduce U.S dependence on foreign energy sources, both for economic and national security reasons. According to the Interstate Natural Gas Association of Americas (INGAA) Natural Gas Pipeline
and Storage Infrastructure Projections Through 2030 report, the U.S. and Canada will need from 28,900 to 61,900 miles of additional natural gas pipeline by 2030 to accommodate the anticipated changes in natural gas supply and demand. The INGAA
report estimates that annual expenditures for pipeline infrastructure will average between $5 billion and $7.5 billion per year.

Our recent acquisitions have expanded our presence and deepened our capabilities in natural gas and petroleum pipeline infrastructure, including the construction and maintenance of large diameter
pipeline, mid-stream pipeline, compressor and pump stations and treatment plants. We anticipate that increased demand for, and development of, natural gas and petroleum pipeline infrastructure will provide robust pipeline and heavy industrial
construction opportunities, and we believe that our diverse capabilities and expertise in this sector will enable us to be a leading player in this growing market.



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Renewable Energy Projects

The desire to decrease the countrys dependence on foreign oil imports and the focus on a clean environment have created demand for
more domestic, environmentally sensitive electrical power production such as wind and solar collection farms. According to a January 2011 report published by the U.S. Environmental Protection Agency (EPA), as of September 2010, 36 states
plus the District of Columbia and Puerto Rico have enacted a renewable portfolio standard or goal. These standards require or target that certain specified percentages of energy sales or installed capacity come from renewable sources such as wind,
solar, geothermal or biofuel. NERCs 2010 Long-Term Reliability Assessment projects approximately 180,000 megawatts (MW) of new wind and solar capacity over the next ten years, and indicates that wind and solar resources account for
95 percent of anticipated renewable resource additions by 2019. Through our most recent acquisitions, we have deepened our expertise in wind, solar and industrial plant construction and expect to be a leading player in renewable energy
infrastructure projects, resulting from increased demand for domestic sources of clean power generation. We also believe that the American Recovery and Reinvestment Act of 2009 (the ARRA), which calls for expansion of domestic renewable
energy sources through tax incentives and loan guarantees, has and will provide our business with the potential for sustained growth from wind, solar and biofuel infrastructure development.

Wind Opportunities

The new generation of wind turbines can produce electrical power at more competitive rates as compared with older turbines. Currently, approximately 2% of the United States electrical needs are met
by wind power generation. Wind power generation is only feasible where adequate average wind speed and consistency are present. The principal onshore wind resource in the United States is located in the central plains area of the country, roughly
from the Texas panhandle to the Canadian border. This wind corridor is a relatively remote area where population density and industrial energy demand are relatively low. As a result, relatively few traditionally fueled generation facilities exist in
these areas; therefore, extensive collection and transmission projects are necessary to connect these renewable energy generation projects to the electrical grid. A July 2008 report by the DOE, however, presents a roadmap for increasing wind power
generation to 20% of demand by 2030, which would require hundreds of billions of dollars in new wind farm investment and transmission lines. In July 2009, the DOE announced the selection of 28 new wind energy projects, which will help address market
and deployment challenges, including wind turbine research, testing and transmission analysis, planning and assessments.

According to the American Wind Energy Association, as of December 31, 2010, the United States had approximately 40,200 MW of
installed wind farm generating capacity, with approximately 5,100 MW added in 2010. There were approximately 5,600 MW under construction as of December 31, 2010, and NERC projects that approximately 166,000 MW of new wind resources will be
added to the power system by 2019. In connection with this growth, Emerging Energy Research forecasts that more than $66 billion will be invested in additional wind energy capacity in the United States through 2013. We believe that demand for new
domestic sources of clean power generation and the related substations and transmission lines necessary to connect them to the electrical grid will provide significant growth prospects for the foreseeable future.

Solar Opportunities

The U.S. photovoltaic (PV) market has grown at an average annual rate of 69% over the past ten years, rising from 3.9 MW in 2000 to 435 MW in 2009. According to the Solar Energy Industries
Association (SEIA), as of the end of the third quarter of 2010, the U.S. had already achieved a record year for PV installations. Total additions in 2010 are expected to exceed 800 MW. The increase in demand has been driven, in part, by
federal and state-level incentives as well as improved project economics. With continued declines in PV manufacturing costs and strong renewable energy incentives, SEIA believes that the U.S. could become the next major PV growth market. In addition
to PV market growth, approximately 80 MW of concentrating solar power (CSP) are projected to be added in 2010. In its 2010 report, NERC projects over 12,000 MW of solar power additions over the next ten years. We believe that we are well
positioned with our solar customers for future projects.

American Recovery and Reinvestment Act Incentives

The ARRA was enacted in February 2009 and contained federal tax incentives applicable to the renewable energy industry. Certain key
renewable energy provisions contained in the ARRA were extended in December 2010. These provisions should have a positive impact on our customers spending in a number of important areas and offer additional incentives that should benefit our
business. One of the federal tax incentives contained in the ARRA is the extension of the production tax credit for wind projects placed into service before 2013. The production tax credit provides the owner of a U.S. wind facility with a
ten-year credit against its federal income tax obligations based on the amount of electricity produced at such facility by the owner and sold to unrelated persons



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during that period. The ARRA allows wind and solar projects to elect to claim the investment tax credit equal to 30% of the cost of certain qualifying assets in lieu of claiming the production
tax credit. The ARRA also includes a U.S. Treasury grant program which allows taxpayers that own production tax credit-eligible and investment tax credit-eligible facilities to receive grants from the U.S. Treasury equal to the amount of the
investment tax credit that would otherwise be available to the facility. The accelerated depreciation provision for renewable energy generation assets provides for a five year depreciable life for these assets, rather than the 15 to 20 year
depreciable lives of many non-renewable energy assets. First year bonus depreciation is also available for eligible renewable energy systems. Under this provision, 100% of the eligible basis may be deducted in the first year for eligible systems
acquired and placed in service between September 8, 2010 and December 31, 2011 and 50% of the eligible basis may be deducted in the first year for eligible systems acquired and placed in service during 2012. Historically, incentives such
as these have increased the construction activity in this sector and are expected to do so in the future. The ARRA also contains several provisions aimed at improving the electrical transmission system in the U.S., in part to facilitate the transfer
of renewable energy from rural areas to high demand areas, including at least $6 billion in funds for renewable energy and transmission loan guarantees, which are expected to facilitate more than $60 billion in loans for these projects.

Inadequacy of Existing Electric Power Transmission and Distribution Networks

The United States electric transmission and distribution infrastructure requires significant ongoing maintenance, upgrades and
extensions to manage power line congestion and avoid delivery failures. Demand for electricity is expected to continue to grow as the economy recovers and as the population grows. According to the 2010 Annual Energy Outlook published by the U.S.
DOEs Energy Information Administration, the population of the United States will increase by about 28% from 2008 to 2035, with energy consumption increasing by a corresponding 14%. NERC reports in its 2010 Long-Term Reliability Assessment that
peak demand for electricity in the U.S. is forecast to increase by approximately 14% over the next ten years. To accommodate the increase in demand, NERC estimates that 34,000 circuit miles will need to be added to the electrical transmission system
in the U.S. over the next ten years. Significant capital investment in the U.S. transmission and distribution system will be required to meet the needs of the growing population as well as the projected increase in use of renewable resources. In
2008, the Edison Electric Institute (EEI) projected that $27 billion of investments in new transmission systems will be made from 2009 to 2013 and that approximately $300 billion of investments are expected over the twenty year period
from 2010 to 2030.

New renewable energy generation projects, including wind and solar collection farms, are typically located
in remote areas. Significant investment in new transmission lines will be required to connect this power to the electrical grid and transport it to more populated or industrial areas with higher demand. In a February 2010 report, the EEI estimated
that $37 billion will be invested from 2009 through 2020 to address the integration of renewable resources through the addition or upgrade of nearly 13,000 circuit miles of transmission. One example of this is the Texas Public Utility
Commissions 2008 approval of approximately $4.9 billion for the construction of electric transmission lines to carry power generated by new wind farms in remote western and northern parts of the state to major population and industrial centers
in Texas. Also driving the growth in renewable energy related transmission growth are the current state level renewable portfolio standards. According to an October 2010 report by The Brattle Group, if the current renewable portfolio standards were
increased to a 20% federal renewable portfolio standard, the investment requirement over the next 10 to 15 years would increase to between $80 billion and $130 billion.

In addition to projects aimed at increasing electric power transmission capacity and the integration of new renewable energy resources, efforts to modernize the transmission system are also expected. The
category of projects using digital technology to improve reliability, security and efficiency of the electric system are known as Smart Grid projects. The ARRA allocates $11 billion in funds for modernization and expansion of the
nations electrical grid in order to develop a Smart Grid.

We believe that spending levels will continue to increase as
utilities work to address infrastructure maintenance, reliability and capacity requirements as well as future reliability standards required by the Energy Policy Act of 2005 and state mandated renewable portfolio standards.

Demand for Increased Wireless and Wired Voice, Video and Data Services

Demand for faster and more robust voice, video and data service has increased significantly with the proliferation of the internet,
broadband, video and music download services, high definition television and other advanced video services. Data usage over wireless networks is rapidly increasing as more consumers surf the web, check email and watch video on mobile devices. As
smartphones, laptops and other devices become increasingly important to consumers, an October 2010 study by the Federal Communications Commission (FCC) estimates that mobile data demand will exceed available wireless capacity in the
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growing to between 25 and 50 times current level of demand within 5 years. To serve this developing market and the ever-increasing need for more and faster bandwidth, voice, video and data
services for fixed and mobile devices, service providers continue to upgrade the capacity and performance of their wired and wireless networks and are deploying competing networks using new technologies such as Worldwide Interoperability for
Microwave Access, or WiMax. Investment is facilitated by declining equipment costs and expanded capabilities of wireline and wireless network equipment. At the same time, major regional and rural telecommunication companies are upgrading their
networks from copper line to fiber optic line in order to enhance their ability to provide customers with bundled services that include video, voice and data. Similar dynamics of providers seeking to improve their offerings are prevalent in the
cable and satellite markets as well. The ARRA has allocated $7.2 billion for the development of broadband facilities throughout the U.S. and the expansion of broadband access into areas that are currently not served by high-speed data networks, with
$4 billion in grants awarded through September 30, 2010.

Competitive Strengths

Our competitive strengths include:

Diverse Customer Relationships. We serve a diversified customer and industry base. Our customers include some of the largest contractors, communications, utility and energy companies
in the United States, including DIRECTV®, AT&T, El Paso Corporation, Enbridge, Edison Mission Energy,
Tenaska Energy, Duke Energy, Talisman Energy, Great River Energy, CenturyLink, Verizon, Iberdrola Renewables and NextEra Energy. We have longstanding relationships with many customers and often provide services to many of our significant customers
under multi-year master service agreements and other service agreements. We believe that as a result of our expansion and diversification efforts, it is unlikely that a single customer will account for greater than 30% of our revenue in the near
future.

National Footprint. Including our predecessor companies, we have been in business for more than
80 years and are one of the largest companies in the infrastructure construction services industry. Through our network of over 260 locations and approximately 9,400 employees as of December 31, 2010, we offer consistent, comprehensive
infrastructure services to our customers nationwide. We believe our experience, technical expertise, geographic reach and size are important to our customers.

Ability to Respond Quickly and Effectively. The skills required to serve our end markets are similar, which allows us to utilize qualified personnel across multiple end markets and
projects. We are able to respond quickly and effectively to industry changes, demand, and major weather events by allocating our employees, fleet and other assets as and where they are needed, enabling us to provide cost effective and timely
services for our customers.

Reputation for Reliable Customer Service and Technical Expertise. We believe that
over the years we have established a reputation for quality customer service and technical expertise. We also believe our reputation for technical expertise gives us an advantage in competing for new work from both our existing and potential
customers. Additionally, the technical expertise gained through our most recent acquisitions has broadened our capabilities in areas of wind power and renewable energy, wireless technology, heavy industrial and pipeline infrastructure.

Experienced Management Team. Our management team, including our chief executive officer, president, chief operating
officer, business unit presidents and financial officers, plays a significant role in establishing and maintaining long-term relationships with our customers, supporting the growth of our business, integrating acquired businesses and managing the
financial aspects of our operations. Our chief executive officer, president, chief operating officer and business unit presidents average 20 plus years of industry experience and have a deep understanding of our customers and their requirements.
Generally, key managers and founders of our recently acquired companies continue to work for us under long-term employment agreements or services agreements.

Strategy

The key elements of our business strategy are as follows:

Focus on Growth Opportunities. We believe that our end markets offer several compelling growth
opportunities. We expect increased spending by key customers in the industries we serve. We expect development of renewable energy infrastructure, including wind and solar farm development and maintenance, natural gas and petroleum pipeline
infrastructure development, expansion of wireless infrastructure, heavy industrial construction and electrical transmission and distribution grid upgrades and expansions to be areas of high investment and opportunity in the coming years. We intend
to use our national presence, technical expertise, customer relationships and full range of services to capitalize on these trends to grow our business.



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Operational Excellence. We intend to continue improving our operating
margins and cash flows by focusing on profitable services and on projects that have higher margins, and by seeking leveraging opportunities within our business, while maintaining strong working capital management practices. We intend to continue to
improve our operating effectiveness and utilization rates by allocating resources across multiple customers and projects, where possible. We intend to continue actions and programs that have been instituted to improve operating efficiencies and
working capital management, such as increasing accountability throughout our organization, managing customer contract bidding procedures more effectively and increasing individual project profitability, hiring additional experienced operating and
financial professionals, and expanding the use of our financial and other management information systems.

Maintain
Conservative Capital Structure. We have increased our financial resources in recent years with the offering of our senior notes in 2007, the expansion of our credit facility in 2008 and two separate senior convertible note offerings
in 2009. Further, during the past two years, two of the major ratings agencies reaffirmed our credit ratings. We intend to maintain a prudent capital structure.

Focus on Acquisition Integration. Through several acquisitions in the last few years, we have diversified our business and expanded our service offerings to our customers. Our
strategy includes timely and efficient integration of these acquisitions to best fit into our internal control environment and to maximize the potential of the acquisitions.

Leverage Core Expertise Through Acquisitions and Strategic Alliances. We may pursue selected acquisitions and strategic alliances that allow us to expand our operations into targeted
geographic areas or allow us to expand our service offerings in related fields.

Services

Our core services are the engineering, building, installing, maintaining and upgrading of infrastructure for communications, utility and
government customers. We provide similar services to each of these customers, including:

Build. We build
renewable energy infrastructure, including wind and solar farms, natural gas, crude oil and refined product transport pipelines, compressor and pump stations and treatment plants, underground and overhead distribution systems, such as trenches,
conduits, cable, power lines and pipelines, which provide wireless and wireline communications and electrical power generation, transmission and distribution.

Install. We install buried and aerial fiber optic cables, coaxial cables, copper lines, electrical and other energy distribution systems, transmission systems and satellite dishes in
a variety of environments for our customers. In connection with our installation work, we deploy and manage network connections that involve our customers hardware, software and network equipment.

Maintain and Upgrade. We offer 24-hours-a-day, 7-days-a-week and 365-days-a-year maintenance and upgrade support to
our customers. Our comprehensive service offerings include the regular maintenance of our customers distribution facilities, networks and infrastructure, including renewable energy and natural gas and petroleum pipeline infrastructure. We also
provide emergency services for accidents or storm damage. Our upgrade work ranges from routine replacements and upgrades to major overhauls.

Customers

We provide
engineering, building, installation, maintenance and upgrade services to our customers, which are companies in the communications and utilities industries, as well as government entities.

We have longstanding relationships with many customers, and approximately half of our revenue is derived from projects performed under
service agreements and master service agreements, which are generally multi-year agreements. Certain of our master service agreements are exclusive up to a specified dollar amount per work order for each defined geographic area but do not obligate
our customers to undertake any infrastructure projects or other work with us. Work performed under master service and other service agreements is typically generated by work orders, each of which is performed for a fixed fee. Services provided under
master service and other service agreements range from engineering and installation work to maintenance and upgrade services. These master service agreements and other service agreements are frequently awarded on a competitive bid basis, although
customers may negotiate contract extensions beyond their original terms without re-bidding. Our master service and other service agreements have various terms, depending upon the nature of the services provided and are typically subject to
termination on short or no advance notice.



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The remainder of our work is generated pursuant to contracts for specific projects that may
require the construction and installation of specified units within an infrastructure system or an entire infrastructure system. Customers are billed with varying frequency: weekly, monthly or upon attaining specific milestones. Such contracts
generally include retainage provisions under which 2% to 15% of the contract price is withheld until the work has been completed and accepted by the customer.

We believe that our industry experience, technical expertise and customer service are important to our being retained by large utility and communications companies as well as government entities. The
relationships developed between our customers and our senior management and project management teams are also important to our being retained.

Revenue concentration information, as a percent of total consolidated revenue, is as follows:



|                                 |  |                                  |    |   |      |  |    |      |  |  |    |  
|-------------------------------- |  | -------------------------------- | -- | - | ---- |  | -- | ---- |  |  | -- | -
|                                 |  | For the Years Ended December 31, |   
|                                 |  | 2010                             |    |   | 2009 |  |    | 2008 | 
|Revenue from top ten customers   |  |                                  | 72 | % |      |  | 72 | %    |  |  | 72 | %
|                                 |  |                                  |   
|Revenue from specific customers: |  |                                  |    |   |      |  |    |      |  |  |    |  
|DIRECTV®                         |  |                                  | 24 | % |      |  | 30 | %    |  |  | 34 | %
|AT&T                             |  |                                  | 20 | % |      |  | 16 | %    |  |  | 12 | %

Refer
to Part II, Item 7, Managements Discussion and Analysis of Financial Condition and Results of Operations - Recent Developments for additional information regarding our purchase option agreement with Red Ventures LLC, which
could adversely affect future revenues from DIRECTV®.

Backlog

Our 18-month backlog was approximately $2.4 billion as of
December 31, 2010 and $2.1 billion as of December 31, 2009. We expect to realize approximately 72% of our year end 2010 backlog in 2011. Our backlog as of December 31, 2010 does not include approximately $0.3 billion of revenues from
a project we have been awarded that is subject to financing contingencies. See Item 1A. Risk Factors - Amounts included in our backlog may not result in actual revenue or translate into profits and our backlog is subject to cancellation
and unexpected adjustments and therefore is an uncertain indicator of future operating results.

Sales and Marketing

Our customers increasingly require resources from multiple disciplines. Therefore, we market our services individually
or in combination with other companies to provide what we believe is the most efficient and effective solution to meet our customers demands. Through our unified MasTec® brand and an integrated organizational structure designed to permit rapid deployment of labor, equipment and materials, we are able to quickly and efficiently
allocate resources to meet customer needs.

We have developed a marketing plan emphasizing the MasTec® registered service mark and tradenames of certain acquired companies, as well as an integrated service offering to
position ourselves as a provider of a full range of service solutions, providing services ranging from basic installation to sophisticated engineering, design and integration. We believe our long-standing relationships with our customers and
reputation for reliability and efficiency facilitate our recurring business. Our marketing efforts are principally carried out by the management of our business units and project groups in coordination with our corporate marketing organization. Our
management team has many years of industry experience, both at the service provider level and in some cases with the customers we serve. Our business unit and project group managers market directly to existing and potential customers for new
contracts and also market our company to be placed on lists of vendors invited to submit proposals for service agreements and individual projects. Our executive management supplements these efforts at the national level.



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Safety and Insurance/Risk Management

We strive to instill safe work habits in our employees. We require our employees to participate in training programs relevant to their
employment and to complete any training programs required by law. We evaluate employees in part based upon their safety records and the safety records of the employees they supervise. We have established a company-wide safety program to share best
practices and to monitor and improve compliance with safety procedures and regulations.

Our business involves the use of
heavy equipment and exposure to various workplace conditions that can be dangerous. While we are committed to operating safely and prudently, we are subject to claims by employees, customers and third parties for property damage and personal
injuries that occur in connection with our work. See Item 1A. Risk Factors - Our business is subject to hazards that could result in substantial liabilities and weaken our financial condition.

We presently maintain insurance policies subject to per claim deductibles of $1 million for our workers compensation policy, $2
million for our general liability policy and $2 million for our automobile liability policy. We have excess umbrella coverage of up to $100 million per claim and in the aggregate. We also maintain an insurance policy with respect to employee group
health claims subject to annual per employee maximum losses of $0.4 million. See Item 1A. Risk Factors - We are self-insured against many potential liabilities. We are required to post letters of credit and provide cash collateral
to our insurance carriers related to our insurance programs. Total outstanding letters of credit related to our insurance programs amounted to $59.5 million and cash collateral deposited with insurance carriers amounted to $2.2 million at
December 31, 2010. See Item 7. Managements Discussion and Analysis of Financial Condition and Results of Operations - Critical Accounting Policies and Estimates - Insurance Reserves.

Suppliers, Materials and Working Capital

Under many of our contracts, our customers supply the necessary materials and supplies for a project and we are responsible for the installation of, but not the cost or warranty, of those materials. Under
certain of our other projects, we acquire materials and supplies for our own account from third-party providers. We are not dependent on any one supplier for materials or supplies and have not experienced any significant difficulty in obtaining an
adequate supply of materials and supplies.

We utilize independent contractors to assist on projects and to help us manage
work flow. Our independent contractors are typically sole proprietorships or small business entities that provide their own vehicles, tools and insurance coverage. We are not dependent on any single independent contractor. See Item 1A. Risk
Factors - We may choose, or be required, to pay our subcontractors even if our customers do not pay, or delay paying us for the related services.

We need working capital to support seasonal variations in our business, primarily due to the impact of weather conditions on external construction and maintenance work and the spending patterns of our
customers, both of which influence the timing of associated spending to support related customer demand. Our business is typically slower in the first quarter of each calendar year. Accordingly, we generally experience seasonal working capital needs
from approximately April through December to support growth in unbilled revenue and accounts receivable, and to a lesser extent, inventory. Our billing terms are generally net 30 days, although some contracts allow our customers to retain a portion
(from 2% to 15%) of the contract amount until the contract is completed. We maintain inventory to meet the material requirements of some of our contracts. Occasionally, certain of our customers pay us in advance for a portion of the materials we
purchase for their projects, or allow us to pre-bill them for materials purchases up to a specified amount. Vendor terms are generally 30 days. Our agreements with subcontractors often contain a pay-when-paid provision, whereby our
payments to subcontractors are made only after we are paid by our customers.

Competition

Our industry is highly competitive and highly fragmented. We often compete with a number of companies in markets in which we operate,
ranging from small local independent companies to large national firms. The national or large regional firms that compete with us include Quanta Services, Inc., MYR Group, Inc., Dycom Industries, Inc., Pike Electric, Inc., Bechtel Corporation, M.A.
Mortenson Company and D.H. Blattner & Sons, Inc.

Relatively few significant barriers to entry exist in the markets
in which we operate and, as a result, any organization that has adequate financial resources and access to technical expertise may become a competitor. Some of our customers employ personnel to perform infrastructure services of the type we provide.
We compete based upon our industry experience, technical expertise, financial and operational resources, nationwide presence, industry reputation and customer service. While we believe our customers consider a number of factors when selecting a
service provider, most of their work is awarded through a bid process. Consequently, price is often a principal factor in determining which service provider is selected. See Item 1A. Risk Factors - Our industry is highly competitive which
may reduce our market share and harm our financial performance.



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Regulation and Environmental Matters

We are subject to state and federal laws that apply to businesses generally, including laws and regulations related to labor relations,
worker safety and environmental protection. While many of our customers operate in regulated industries (for example, utilities regulated by the public service commission or broadband companies regulated by franchise agreements with various
municipalities), we are not generally subject to such regulation and oversight.

As a contractor, our operations are subject
to various laws, including:



| |  |  | regulations related to vehicle registrations, including those of state and the United States Departments of Transportation;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------



| |  |  | regulations related to worker safety and health, including those established by the Occupational Safety and Health Administration;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------



| |  |  | contractor licensing requirements;
| | - |  | ----------------------------------



| |  |  | building and electrical codes; and
| | - |  | ----------------------------------



| |  |  | permitting and inspection requirements.
| | - |  | ---------------------------------------

We are also subject to numerous environmental laws governing our operations, including the handling, transportation and disposal of non-hazardous and hazardous substances and wastes, as well as emissions
and discharges into the environment, including discharges into air, surface water and groundwater and soil. We also are subject to laws and regulations that impose liability and cleanup responsibility for releases of hazardous substances into the
environment. Under certain of these laws and regulations, liabilities can be imposed for cleanup of properties, regardless of whether we directly caused the contamination or violated any law at the time of discharge or disposal. The presence of
contamination from such substances or wastes could interfere with ongoing operations or adversely affect our business. In addition, we could be held liable for significant penalties and damages under certain environmental laws and regulations. For
example,



| |  |  | Some of the work we perform is in underground environments. If the field location maps supplied to us are not accurate, or if objects are present in
the soil that are not indicated on the field location maps, our underground work could strike objects in the soil containing pollutants and result in a rupture and discharge of pollutants. In such a case, we may be liable for fines and damages.
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | We own and lease several facilities at which we store our equipment. Some of these facilities contain fuel storage tanks which may be above or below
ground. If these tanks were to leak, we could be responsible for the cost of remediation as well as potential fines.
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | We sometimes perform directional drilling operations in certain environmentally sensitive terrains and water bodies. Due to the inconsistent nature of
the terrain and water bodies, it is possible that such directional drilling may cause a surface fracture releasing subsurface materials. These releases may contain contaminants in excess of amounts permitted by law, potentially exposing us to
remediation costs and fines.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

See Item 1A. Risk Factors - Our failure to comply with
environmental laws could result in significant liabilities.

We believe we have all licenses and permits needed to
conduct operations and that we are in compliance with all material applicable regulatory requirements. However, if we fail to comply with any material applicable regulatory requirements, we could incur significant liabilities. See Item 1A. Risk
Factors - Our failure to comply with regulations of the U.S. Occupational Safety and Health Administration, the U.S. Department of Transportation and other state and local agencies that oversee transportation and safety compliance could reduce
our revenue, profitability and liquidity.

We offer services and are branded under the MasTec® service mark and other service marks.



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Financial Information About Geographic Areas

We operate primarily in the United States, however, we derived $2.8 million and $5.1 million of our revenues from foreign operations,
primarily in Latin America and the Caribbean, during the years ended December 31, 2010 and 2009, respectively. During the year ended December 31, 2008, foreign revenues were immaterial. In addition, we held property and equipment of $1.4
million and $0.3 million in foreign countries as of December 31, 2010 and 2009, respectively.

Our business, financial
condition and results of operations in foreign countries may be adversely affected by monetary and fiscal policies, currency fluctuations, energy shortages, regulatory requirements and other political, social and economic developments or
instability. Refer to Item 1A - Risk Factors for additional information.

Employees

As of December 31, 2010, we had approximately 9,400 employees, 1,100 of which were represented by a union or were subject to
collective bargaining agreements. These collective bargaining agreements require us to pay specified wages and provide certain benefits to these employees, including contributions to multi-employer pension plans and employee benefit trusts. The
collective bargaining agreements expire at various times and have typically been renegotiated and renewed on terms that are similar to the ones contained in the expiring agreements. See Item 1A, Risk Factors - Certain of our businesses
have employees who are represented by a union or are subject to collective bargaining agreements; the unionized workforce and any related obligations could adversely affect our operations.

We hire employees from a number of sources, including our industry, trade schools and colleges. Our primary sources for employees include
promotion from within, team member referrals, print and internet advertising and direct recruiting. We attract and retain employees by offering technical training opportunities, bonus opportunities, stock ownership, competitive salaries and a
comprehensive benefits package.

We believe that our focus on training and career development helps us to attract and retain
employees. Our employees participate in ongoing educational programs, many of which are internally developed, to enhance their technical and management skills through classroom and field training. We provide opportunities for promotion and mobility
within our organization, which we also believe helps us to retain our employees. We believe our relations with our employees are good.

Available Information

A
copy of this Annual Report on Form 10-K, as well as our Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and any amendments to those reports filed or furnished pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934,
are available free of charge on the internet at our website, www.mastec.com, as soon as reasonably practicable after we electronically file these reports with, or furnish these reports to, the Securities and Exchange Commission, which we refer to as
the SEC. Copies of our Board of Directors Governance Principles and Code of Business Conduct and Ethics, which applies to all directors and employees and includes a code of ethics for our CEO, CFO and other senior executives, and which expressly
applies to our senior financial officers (including our principal executive officer, principal financial officer and our controller), and the charters for each of our Audit, Compensation and Nominating and Corporate Governance Committees are also
available on the Internet in the Investor section of our website under the tab Corporate Governance, or may be obtained by contacting our Vice President of Investor Relations by phone at (305) 406-1815, or by email at
investor.relations@mastec.com. We intend to provide any amendments or waivers to our Code of Business Conduct and Ethics for any of our directors and senior officers on our website within four business days of any such amendment or waiver. The
reference to our website address does not constitute incorporation by reference of the information contained on the website and should not be considered part of this report. Our reports filed with the SEC may be read or copied at the SECs
Public Reference Room at 100 F Street, NE, Washington, D.C. 20549. Information on the operation of the SECs Public Reference Room may be obtained by calling the SEC at 1-800-SEC-0330. Alternatively, you may access these reports
at the SECs website at www.sec.gov.



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|ITEM 1A. | RISK FACTORS
|-------- | ------------

You
should carefully consider the risks described below, together with all of the other information in this Annual Report on Form 10-K. The risks described below are not the only risks facing us. Additional risks and uncertainties not currently known to
us or that we currently deem to be immaterial may also materially and adversely affect our business operations. If any of these risks actually occurs, our business, financial condition and results of operations could suffer and the trading price of
our common stock could decline.

Risks Related to Our Industry and Our Customers Industries

Economic downturns could reduce capital expenditures in the industries we serve, which may result in a decrease in demand for our services.

The demand for our services has been, and will likely continue to be, cyclical in nature and vulnerable to general
downturns in the U.S. economy. Given the recent financial market turmoil, our customers may not have the ability to fund capital expenditures for infrastructure, or may have difficulty in obtaining financing, which may result in cancellations of
projects or deferral of projects to a later date. Such cancellations or deferrals could result in decreased demand for our services and could materially adversely affect our results of operations, cash flows and liquidity.

In addition, our customers are affected by economic downturns that decrease the need for their services or the profitability of their
services. Slow-downs in real estate, fluctuations in commodity prices and decreased demand by end-customers for services could affect our customers and their capital expenditure plans. Because we have been negatively impacted by previous economic
downturns, we constantly monitor our customers industries and their relative health compared to the economy as a whole. Reductions in new housing starts, for example, have negatively affected our customers who utilize our services to construct
their last mile of communications infrastructure, as well as other industries we serve, including electric utility transmission and grid connection, water and sewer and natural gas pipeline construction. Additionally, our customers who
provide satellite and broadband communications to consumers across the country could be adversely impacted by an economic downturn if new subscriptions and upgrades for new and existing consumers are not ordered at the rate that our customers
anticipate. During an economic downturn, like the current economic downturn, our customers also may not have the ability or desire to continue to fund capital expenditures for infrastructure or may determine to outsource less work. A decrease in any
of these projects, new subscriptions and upgrades or any other services we provide could materially adversely affect our results of operations, cash flows and liquidity.

Our industry is highly competitive, which may reduce our market share and harm our financial performance.

Our industry is highly fragmented, and we compete with other companies in most of the markets in which we operate, ranging from small independent firms servicing local markets to larger firms servicing
regional and national markets. We also face competition from existing or prospective customers that employ in-house personnel to perform some of the same types of services we provide. There are relatively few barriers to entry into certain of the
markets in which we operate and, as a result, any organization that has adequate financial resources and access to technical expertise and skilled personnel may become one of our competitors.

Most of our customers work is awarded through a bid process. Consequently, price is often the principal factor in determining which
service provider is selected, especially on smaller, less complex projects. Smaller competitors are sometimes able to win bids for these projects based on price alone due to their lower costs and financial return requirements. If we are unsuccessful
in bidding on these projects, or if our ability to win such projects requires that we accept lesser margins, then our results of operations, cash flows and liquidity could be materially and adversely affected.

Many of the industries we serve are subject to consolidation and rapid technological and regulatory change, and our inability or failure to adjust
to our customers changing needs could reduce demand for our services.

We derive, and anticipate that we will
continue to derive, a substantial portion of our revenue from customers in the communications and utilities industries. The communications and utilities industries are subject to rapid changes in technology and governmental regulation. Changes in
technology may reduce the demand for the services we provide. For example, new or developing technologies could displace the wireline systems used for the transmission of voice, video and data, and improvements in existing technology may allow
communications providers to significantly improve their networks without physically upgrading them. Technological advances may also result in lower costs for sources of energy, which may render existing wind energy, solar energy and natural gas
projects and technologies uncompetitive or obsolete. Additionally, the communications and utilities industries have



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been characterized by a high level of consolidation that may result in the loss of one or more of our
customers. Our failure to rapidly adopt and master new technologies as they are developed in any of the industries we serve or the consolidation of one or more of our significant customers could have a material adverse effect on our results of
operations, cash flows and liquidity.

Risks Related to Our Business

We derive a significant portion of our revenue from a few customers, and the loss of one of these customers or a reduction in their demand for our services could impair our financial performance.

For the year ended December 31, 2010, we derived approximately 24%, 20% and 9% of our
revenue from DIRECTV®, AT&T and El Paso Corporation, respectively. For the year ended December 31,
2009, we derived approximately 30%, 16%, 7% and 5% of our revenue from DIRECTV®, AT&T, Enbridge and Verizon,
respectively, and for the year ended December 31, 2008, we derived approximately 34%, 12% and 8% of our revenue from
DIRECTV®, AT&T and Verizon, respectively. In addition, our ten largest customers accounted for approximately
72% of our revenue in each of the three years ended December 31, 2010, 2009 and 2008, respectively. Because our business is concentrated among relatively few major customers, and certain of our services are provided on a non-recurring, project
by project basis, we could experience a reduction in our results of operations, cash flows and liquidity if the amount of business we obtain from these customers is reduced, or if we complete the required work on our projects and cannot replace them
with similar projects. We have recently experienced an increase in the proportion of our revenues from non-recurring project specific work, which may further increase this risk if we are not able to replace completed project work with new work. In
addition, many of the contracts with our largest customers may be canceled on short or no advance notice. Any of these factors could negatively impact our results of operations, cash flows and liquidity.

Additionally, pursuant to our February 2011 amended and restated purchase option agreement with Red Ventures LLC
(Red Ventures), Red Ventures has an option to purchase DirectStar TV LLC (DirectStar) and its subsidiaries (which, in support of the DIRECTV® installation business, provides marketing and sales services on behalf of DIRECTV®) from MasTec at any time from March 1, 2012 to November 30, 2012, for an amount equal to the sum of: (i) the shareholders equity of DirectStar as
of May 31, 2010, (ii) five percent (5%) of adjusted net income (generally, the net income (loss) before provision for income taxes) of DirectStar from January 1, 2010 until the last day of the month immediately prior to the date
of the sale and (iii) $25,600,000. Should Red Ventures exercise its purchase option, our revenues and profits from
DIRECTV® would be reduced.

Most of our contracts do not obligate our customers to undertake any infrastructure projects or other work with us.

More than half of our revenue is derived from multi-year master service agreements and other service agreements. Under our multi-year master service agreements and other service agreements, we contract to
provide customers with individual project services, through work orders, within defined geographic areas on a fixed fee basis. Under these agreements, our customers have no obligation to undertake any infrastructure projects or other work with us. A
significant decline in the projects customers assign us under these service agreements could result in a decline in our results of operations, cash flows and liquidity.

Most of our contracts may be canceled on short or no advance notice, so our revenue is not guaranteed. Additionally, certain of our contracts with customers are subject to their ability to secure
financing or other conditions and therefore may not result in revenues or profits.

Most of our contracts are
cancelable on short or no advance notice, ranging from immediate cancellation to cancellation upon 180 days notice, even if we are not in default under the contract. Many of our contracts, including our service agreements, are periodically open to
public bid. We may not be the successful bidder on our existing contracts that are re-bid. We also provide a significant portion of our services on a non-recurring, project-by-project basis. We could experience a reduction in our revenue,
profitability and liquidity if:



| |  |  | our customers cancel a significant number of contracts;
| | - |  | -------------------------------------------------------



| |  |  | we fail to win a significant number of our existing contracts upon re-bid; or
| | - |  | -----------------------------------------------------------------------------



| |  |  | we complete the required work under a significant number of our non-recurring projects and cannot replace them with similar projects.
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------



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Additionally, from time to time, we may announce the award of certain contracts. These
contracts may contain financing or other conditions and therefore may not result in revenues or profits if our customers are unable to obtain the associated financing or any other conditions associated with such projects are otherwise not met.

Amounts included in our backlog may not result in actual revenue or translate into profits, and our backlog is subject to cancellation
and unexpected adjustments and therefore is an uncertain indicator of future operating results.

A significant portion
of our 18-month backlog at December 31, 2010 was composed of master service agreements and other service agreements, none of which require our customers to purchase a minimum amount of services and are cancelable on short or no advance notice.
The balance of our backlog is our estimate of work to be completed on long-term installation/construction fixed price agreements. These backlog amounts are based on our estimates and therefore may not result in actual receipt of revenue in the
originally anticipated period, or at all. In addition, contracts included in our backlog may not be profitable. We may experience variances in the realization of our backlog because of project delays or cancellations resulting from weather
conditions, other project deferrals or delays, scope adjustments, external market factors and economic factors beyond our control. If our backlog fails to materialize, our results of operations, cash flows and liquidity would be materially and
adversely affected. Accordingly, our backlog as of any particular date is an uncertain indicator of future earnings.

Our business is
seasonal and is affected by adverse weather conditions and the spending patterns of our customers, exposing us to variable quarterly results.

Some of our customers reduce their expenditures and work order requests towards the end of the year. Adverse weather conditions, particularly during the winter season, also affect our ability to perform
outdoor services in certain regions of the United States. As a result, we experience reduced revenue in the first quarter of each calendar year. Natural catastrophes such as hurricanes could also have a negative impact on the economy overall and on
our ability to perform outdoor services in affected regions or utilize equipment and crews stationed in those regions, which could result in a decline in results of operations, cash flows and liquidity.

We may not accurately estimate the costs associated with our services provided under fixed price contracts, which could impair our financial
performance.

A substantial portion of our revenue is derived from master service agreements and other service
agreements that are fixed price contracts. Under these contracts, we set the price of our services on a per unit or aggregate basis and assume the risk that the costs associated with our performance may be greater than we anticipated. In addition to
master or other service agreements, we enter into contracts that require installation or construction of specified units within an infrastructure system. Under those agreements, we have also contractually agreed to a price per unit. Profitability
will be reduced if the actual costs to complete each unit exceed original estimates. We are also required to immediately recognize the full amount of any expected losses on these projects if estimated costs to complete the remaining units for the
projects exceed the revenue to be earned on such units. Our profitability is therefore dependent upon our ability to accurately estimate the costs associated with our services. These costs may be affected by a variety of factors, such as lower than
anticipated productivity, conditions at the work sites differing materially from what was anticipated at the time we bid on the contract and higher costs of materials and labor. These variations, along with other risks inherent in performing fixed
price contracts, may cause actual revenue and gross profits for a project to differ from those originally estimated, and as a result, certain agreements or projects could have lower margins than anticipated, or losses if actual costs for our
contracts exceed our estimates, which could reduce our profitability, cash flows and liquidity.

We recognize revenue for our
installation/construction fixed price contracts using the percentage-of-completion method, therefore, variations of actual results from our assumptions may reduce our profitability.

We recognize revenue on long-term installation/construction fixed price contracts using the percentage-of-completion method. Under the
percentage-of-completion method, we record revenue as work on the contract progresses. The cumulative amount of revenue recorded on a contract at a specified point in time is that percentage of total estimated revenue that incurred costs to date
bear to estimated total contract costs. The percentage-of-completion method therefore relies on estimates of total expected contract costs. Contract revenue and total cost estimates are reviewed and revised periodically as the work progresses.
Adjustments are reflected in contract revenue in the fiscal period in which such estimates are revised. Estimates are based on managements reasonable assumptions and experience, but are only estimates. Variation of actual results from
estimates on a large project or on a number of smaller projects could be material. We immediately recognize the full amount of the estimated loss on a contract when our estimates indicate such a loss. Such adjustments and accrued losses could result
in reduced profitability, which could negatively impact our liquidity. For the years ended December 31, 2010 and 2009, we incurred approximately $6.2 million and $5.6 million, respectively, of losses on percentage-of-completion contracts.



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Our failure to properly manage projects, or project delays, may result in additional costs or claims,
which could have a material adverse effect on our operating results, cash flows and liquidity.

Certain of our
engagements involve large-scale, complex projects. The quality of our performance on such a project depends in large part upon our ability to manage our client relationship and the project itself and to timely deploy appropriate resources, including
third-party contractors and our own personnel. Our results of operations, cash flows and liquidity could be adversely affected if we miscalculate the resources or time needed to complete a project with capped or fixed fees, or the resources or time
needed to meet contractual milestones. Additionally, delays on a particular project, including permitting delays, may cause us to incur costs for standby pay, and may lead to personnel shortages on other projects scheduled to commence at a later
date. In addition, some of our agreements require that we share in cost overages or pay liquidated damages if we do not meet project deadlines; therefore, any failure to properly estimate or manage cost, or delay in the completion of projects could
subject us to penalties which could further adversely affect our results of operations, cash flows and liquidity. Further, any defects or errors, or failures to meet our customers expectations could result in large damage claims against us,
and because of the substantial cost of, and potentially long lead-time necessary to acquire certain of the materials and equipment used in our complex projects, particularly our wind farm and pipeline projects, damage claims may substantially exceed
the amount we can charge for our associated services.

We may be unable to obtain sufficient bonding capacity to support certain service
offerings, and the need for performance and surety bonds may reduce our availability under our credit facility.

Some
of our contracts require performance and payment bonds. In August 2010, we increased our performance bonding capacity to accommodate growth on projects with bonding requirements. If our business continues to grow, our bonding requirements may
increase. If we are not able to renew or obtain a sufficient level of bonding capacity in the future, we may be precluded from being able to bid for certain contracts or successfully contract with certain customers. In addition, even if we are able
to successfully renew or obtain performance or payment bonds, we may be required to post letters of credit in connection with the bonds, which would reduce availability under our credit facility.

Increases in our insurance premiums or collateral requirements could significantly reduce our profitability, liquidity and availability under our
credit facility.

Because of factors such as increases in claims, projected significant increases in medical costs and
wages, lost compensation and reductions in coverage, insurance carriers may be unwilling to continue to provide us with our current levels of coverage without a significant increase in insurance premiums or collateral requirements to cover our
deductible obligations. An increase in premiums or collateral requirements could significantly reduce our profitability and liquidity as well as reduce availability under our revolving credit facility.

We are self-insured against many potential liabilities.

Although we maintain insurance policies with respect to automobile liability, general liability, workers compensation and employee group health claims, those policies are subject to high
deductibles, and we are self-insured up to the amount of the deductible. Since most claims against us do not exceed the deductibles under our insurance policies, we are effectively self-insured for substantially all claims. We actuarially determine
any liabilities for unpaid claims and associated expenses, including incurred but not reported losses, and reflect the present value of those liabilities in our balance sheet as other current and non-current liabilities. The determination of such
claims and expenses and the appropriateness of the related liability is reviewed and updated quarterly. However, insurance liabilities are difficult to assess and estimate due to the many relevant factors, the effects of which are often unknown,
including the severity of an injury, the determination of our liability in proportion to other parties, the number of incidents not reported and the effectiveness of our safety program. If our insurance claims increase or if costs exceed our
estimates of insurance liabilities, we could experience a decline in profitability and liquidity.



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Warranty claims resulting from our services could have a material adverse effect on our business.

We generally warrant the work we perform for a one to two-year period following substantial completion of a project,
subject to further extensions of the warranty period following repairs or replacements. We have not historically accrued reserves for potential warranty claims as they have been immaterial. The costs associated with such warranties, including any
warranty related legal proceedings, could have a material adverse effect on our results of operations, cash flows and liquidity.

Demand
for pipeline construction services depends on oil and natural gas industry activity and expenditure levels that are directly affected by trends in oil, natural gas and other fuel prices and the cost of energy infrastructure projects.

Demand for our pipeline construction services is particularly sensitive to the level of exploration, development, and
production activity of, and the corresponding capital spending by, oil and natural gas companies. Prices for oil and natural gas are subject to large fluctuations in response to relatively minor changes in the supply of and demand for oil and
natural gas, market uncertainty, and a variety of other factors that are beyond our control. Low prices for oil and natural gas generally depress levels of exploration, development and production activity, resulting in a corresponding decline in the
demand for pipeline construction services. Factors affecting the prices of oil and natural gas include:



| |  |  | the levels of supply and demand for oil and natural gas, especially demand for natural gas in the United States;
| | - |  | ----------------------------------------------------------------------------------------------------------------



| |  |  | governmental regulations, including policies regarding the exploration, production and development of oil and natural gas reserves as well as
environmental laws and initiatives to control global warming;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | global weather conditions and natural disasters;
| | - |  | ------------------------------------------------



| |  |  | worldwide political, military, and economic conditions; the level of oil production by non-OPEC countries and available excess production capacity
within OPEC;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | oil refining capacity and shifts in end-customer preferences toward fuel efficiency and the use of natural gas;
| | - |  | ---------------------------------------------------------------------------------------------------------------



| |  |  | the cost of producing and delivering oil and gas; and
| | - |  | -----------------------------------------------------



| |  |  | potential acceleration of development of alternative fuels.
| | - |  | -----------------------------------------------------------

Historically, the markets for oil and gas have been volatile and are likely to continue to be volatile. Spending on exploration and production activities by large oil and gas companies has a significant
impact on the activity levels of pipeline construction services.

In addition, demand for pipeline construction services may
be affected by the costs of energy exploration and constructing energy infrastructure projects. For example, while high oil and gas prices may increase oil and gas exploration, production and transportation activity, high demand for equipment,
materials and labor required for such projects may increase the costs of such projects and dampen demand for our services. Furthermore, increased costs for raw materials such as steel and other commodities may make some projects uneconomical despite
robust oil and gas prices, thus reducing demand for our pipeline construction services. A decrease in demand for our pipeline construction services could materially and adversely affect our results of operations, cash flows and liquidity.

Legislative actions and incentives relating to electric power and renewable energy may fail to result in increased demand for our
services.

While we believe the Energy Policy Act of 2005 (the Energy Act) will provide opportunities in
the industries we serve, implementation of the Energy Act is still subject to considerable fiscal and regulatory uncertainty. Regulations implementing the components of the Energy Act that may affect demand for our services remain, in some cases,
subject to review in various federal courts. In one such case, decided in February 2009, a federal court of appeals vacated FERCs interpretation of the scope of its backstop siting authority. Accordingly, the effect of these regulations, once
finally implemented, is uncertain. As a result, the Energy Act may not result in increased spending on electric power transmission infrastructure. Continued uncertainty regarding the implementation of the Energy Act may result in slower than
anticipated growth in demand for our services.



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Changes to renewable portfolio standards could, and decreased demand for renewable energy projects
would, negatively impact our results of operations, cash flows and liquidity.

A significant portion of our business
is currently focused on providing construction and/or installation services to owners and operators of wind power, solar power and other renewable energy facilities. The development of wind, solar and other renewable energy facilities is highly
dependent upon the federal production tax credit associated with the ARRA and the existence of renewable portfolio standards and other state incentives. Renewable portfolio standards are state specific statutory provisions requiring that electric
utilities generate a certain amount of electricity from renewable energy sources or devote a certain portion of operational/development capacity to renewable energy sources. Additionally, certified renewable energy generators earn certificates for
every unit of electricity they produce and can sell these along with their electricity to supply companies. These standards have spurred significant growth in the wind and renewable energy industry and a corresponding increase in demand for
renewable energy infrastructure construction services. Currently, 36 states as well as the District of Columbia and Puerto Rico have adopted renewable portfolio standards or goals. Elimination of, or changes to, existing renewable portfolio
standards or similar environmental policies may negatively affect demand for our services.

Additionally, renewable energy is
generally more expensive to produce and may require additional power generation sources as backup. The locations of renewable energy projects are often remote and are not viable unless connectivity to the grid to transport the power to demand
centers is economically feasible. Furthermore, funding for renewable energy initiatives may not be available. These factors could result in fewer renewable energy projects than anticipated or a delay in the timing of construction of these projects
and the related infrastructure, which would negatively affect demand for our services.

The impact of the American Recovery and
Reinvestment Act of 2009 is uncertain.

The recent economic downturn, coupled with a lack of available capital,
resulted in a tremendous amount of uncertainty, with numerous renewable energy projects being delayed or canceled. While we believe that the ARRA, which was enacted into law in February 2009, should aid renewable energy, electrical transmission and
rural broadband market opportunities, the extent to which it will result in future revenues is uncertain. We cannot predict when programs under the ARRA will be implemented, or the timing and scope of investments to be made under these programs.
Investments for renewable energy, electric power infrastructure rural broadband facilities under ARRA programs may not occur, may be less than anticipated or may be delayed, which would negatively impact demand for our services.

Additionally, the tax incentives provided by the ARRA have a finite duration. Currently, the election to claim the investment tax credit
in lieu of the production tax credit is only available for qualified wind facilities placed in service from 2009 to December 31, 2012; the U.S. Treasury grant program will only be applicable to wind and solar projects placed in service in 2010
or 2011 (or after 2011 so long as construction begins in 2010 or 2011 and is completed before the termination date of the credit otherwise available for the property); and the production tax credit is scheduled to expire on December 31, 2012
and will not be available for energy generated from wind facilities placed in service after that date unless the credit program is extended or renewed. Whether the investment tax credit or U.S. Treasury grant program will be effective for wind,
solar or other renewable energy projects is uncertain, as are any future efforts to extend or renew the production tax credit, the investment tax credit, and/or the U.S. Treasury grant program. Furthermore, the provisions regarding any extension or
renewal may not be as favorable as those that currently exist. In addition, we cannot assure you that any extension or renewal of the production tax credit, the investment tax credit, and/or the U.S. Treasury grant program would be enacted prior to
its expiration or, if allowed to expire, that any extension or renewal enacted thereafter would be enacted with retroactive effect. We also cannot assure you that the tax laws providing for accelerated and bonus depreciation with respect to wind or
solar energy generation assets will not be modified, amended or repealed in the future. If the investment tax credit or the U.S. Treasury grant program are not effective or if the federal production tax credit is not extended or renewed, or is
extended or renewed at a lower rate, the ability of our customers to obtain financing for these projects may be impaired or eliminated. In addition, changes to, or ineffectiveness of, the ARRA incentives could cause wind and solar farms to be less
profitable, thereby potentially reducing demand for our wind and solar farm infrastructure construction services. Our revenue and results of operations could be materially adversely affected if demand for our services or the tax incentives were
reduced.



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Many of our customers are highly regulated and the addition of new regulations or changes to existing
regulations may adversely impact their demand for our specialty contracting services and the profitability of those services.

Many of our communications customers are regulated by the FCC, and our energy customers are regulated by FERC. In addition, our utility customers are regulated by state public utility commissions. These
agencies may interpret the application of their regulations in a manner that is different than the way such regulations are currently interpreted and may impose additional regulations. If existing or new regulations have an adverse affect on our
customers and adversely impact the profitability of the services they provide, demand for our specialty contracting services may be reduced.

Our business may be affected by difficult work sites and environments, which could cause delays and result in additional costs.

We perform work under a variety of conditions, including, but not limited to, difficult and hard to reach terrain and difficult site
conditions. Performing work under such conditions can result in project delays or cancellations, potentially causing us to incur additional, unanticipated costs, reductions in revenues or the payment of liquidated damages. In addition, some of our
contracts require that we assume the risk should actual site conditions vary from those expected.

Some of our projects
involve challenging engineering, procurement and construction phases that may occur over extended time periods, sometimes over several years. We may encounter difficulties in engineering, delays in designs or materials provided by the customer or a
third party, equipment and material delivery delays, schedule changes, delays from customer failure to timely obtain rights-of-way, weather-related delays, delays by subcontractors in completing their portion of the project and other factors, some
of which are beyond our control, but which impact our ability to complete a project within the original delivery schedule. In some cases, delays and additional costs may be substantial, and we may be required to cancel a project and/or compensate
the customer for the delay. We may not be able to recover any of such costs. Any such delays or cancellations, defects or errors or other failures to meet customer expectations could result in damage claims substantially in excess of the revenue
associated with a project. Delays or cancellations could also negatively impact our reputation or relationships with our customers, which could adversely affect our ability to secure new contracts.

Our failure to comply with environmental laws could result in significant liabilities.

Some of the work we perform is in underground environments. If the field location maps supplied to us are not accurate, or if objects are
present in the soil that are not indicated on the field location maps, our underground work could strike objects in the soil containing pollutants and result in a rupture and discharge of pollutants. In such a case, we may be liable for fines and
damages.

We own and lease several facilities at which we store our equipment. Some of these facilities contain fuel storage
tanks which may be above or below ground. If these tanks were to leak, we could be responsible for the cost of remediation as well as potential fines. Additionally, we sometimes perform directional drilling operations below certain environmentally
sensitive terrains and water bodies. Due to the inconsistent nature of the terrain and water bodies, it is possible that such directional drilling may cause a surface fracture releasing subsurface materials. These releases may contain contaminants
in excess of amounts permitted by law, potentially exposing us to remediation costs and fines. In addition, new environmental laws and regulations, stricter enforcement of existing laws and regulations, the discovery of previously unknown
contamination or leaks, or the imposition of new clean-up requirements could require us to incur significant costs or become the basis for new or increased liabilities that could have a material negative impact on our results of operations, cash
flows and liquidity.

Our business is subject to hazards that could result in substantial liabilities and weaken our financial
condition.

Construction projects undertaken by us expose our employees to electrical lines, pipelines carrying
potentially explosive materials, heavy equipment, mechanical failures, transportation accidents, adverse weather conditions and the risk of damage to equipment and property. These hazards can cause personal injuries and loss of life, severe damage
to or destruction of property and equipment and other consequential damages and could lead to suspension of operations and large damage claims which could, in some cases, substantially exceed the amount we charge for the associated services. In
addition, if serious accidents or fatalities occur, or our safety records were to deteriorate, we may be restricted from bidding on certain work and obtaining other new contracts and certain existing contracts could be terminated. Our safety
processes and procedures are monitored by various agencies and rating bureaus. See Risk Factors - Our failure to comply with the regulations of the U.S. Occupational Safety and Health Administration, the U.S. Department of Transportation and
other state and local agencies that oversee transportation and safety compliance could



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reduce our revenue, profitability and liquidity. The occurrence of accidents in our business could
result in significant liabilities, employee turnover, increase the costs of our projects, or harm our ability to perform under our contracts or enter into new contracts with customers, which could materially reduce our revenue, profitability and
liquidity.

Our operations may impact the environment or cause exposure to hazardous substances, and our properties may have
environmental contamination, which could result in material liabilities.

Our operations are subject to various
environmental laws and regulations, including those dealing with the handling and disposal of waste products, PCBs, fuel storage and air quality. Certain of our current and historical construction operations have used hazardous materials and, to the
extent that such materials are not properly stored, contained or recycled, they could become hazardous waste. Additionally, some of our contracts require that we assume the environmental risk of site conditions and require that we indemnify our
customers for any damages, including environmental damages incurred in connection with our projects. We may be subject to claims under various environmental laws and regulations federal and state statutes and/or common law doctrines for toxic torts
and other damages, as well as for natural resource damages and the investigation and clean up of soil, surface water, groundwater, and other media under laws such as the Comprehensive Environmental Response, Compensation, and Liability Act. Such
claims may arise, for example, out of current or former conditions at project sites, current or former properties owned or leased by us, and contaminated sites that have always been owned or operated by third parties. Liability may be imposed
without regard to fault and may be strict, joint and several, such that we may be held responsible for more than our share of any contamination or other damages, or even for the entire share, and may be unable to obtain reimbursement from the
parties causing the contamination.

Our failure to comply with the regulations of the U.S. Occupational Safety and Health
Administration, the U.S. Department of Transportation and other state and local agencies that oversee transportation and safety compliance could reduce our revenue, profitability and liquidity.

The Occupational Safety and Health Act of 1970, as amended, or OSHA, establishes certain employer responsibilities, including maintenance
of a workplace free of recognized hazards likely to cause death or serious injury, compliance with standards promulgated by the Occupational Safety and Health Administration and various recordkeeping, disclosure and procedural requirements. Various
standards, including standards for notices of hazards and safety in excavation and demolition work may apply to our operations. We have incurred, and will continue to incur, capital and operating expenditures and other costs in the ordinary course
of business in complying with OSHA and other state and local laws and regulations, and could incur penalties and fines in the future, including in extreme cases, criminal sanctions.

While we have invested, and will continue to invest, substantial resources in occupational health and safety programs, our industry
involves a high degree of operational risk, and there can be no assurance that we will avoid significant liability exposure. Although we have taken what are believed to be appropriate precautions, we have suffered employee injuries and fatalities in
the past and may suffer additional injuries or fatalities in the future. Serious accidents of this nature may subject us to substantial penalties, civil litigation or criminal prosecution. Personal injury claims for damages, including for bodily
injury or loss of life, could result in substantial costs and liabilities, which could materially and adversely affect our financial condition, results of operations or cash flows. In addition, if our safety record were to substantially deteriorate,
or if we suffered substantial penalties or criminal prosecution for violation of health and safety regulations, customers could cancel existing contracts and not award future business to us, which could materially adversely affect our liquidity,
cash flows and results of operations.

We have, from time to time, received notice from the U.S. Department of Transportation
that our motor carrier operations will be monitored and that the failure to improve our safety performance could result in suspension or revocation of vehicle registration privileges. If we were not able to successfully resolve these issues, our
ability to service our customers could be damaged, which could lead to a material adverse effect on our results of operations, cash flows and liquidity.

Risks associated with operating in international markets could restrict our ability to expand globally and harm our business and prospects, and we could be adversely affected by our failure to
comply with the laws applicable to our foreign activities, including the U.S. Foreign Corrupt Practices Act and other similar worldwide anti-bribery laws.

While only a small percentage of our revenue is currently derived from international markets, we may expand the volume of services we provide internationally. Our international operations are presently
conducted primarily in Latin America and the Caribbean, but we have performed work in Canada and various other foreign countries, and revenues derived from, or the number of countries in which we operate, could expand over the next few years.
Economic conditions, including those resulting from wars, civil unrest, acts of terrorism and other conflicts or volatility in the global markets, may adversely affect our customers, their demand for



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our services and their ability to pay for our services. In addition, there are numerous risks inherent in
conducting our business internationally, including, but not limited to, potential instability in international markets, changes in regulatory requirements applicable to international operations, foreign currency fluctuations, exchange controls and
other limits on our ability to repatriate earnings, political, economic and social conditions in foreign countries and complex U.S. and foreign laws and treaties, including tax laws and the U.S. Foreign Corrupt Practices Act (the
FCPA). These risks could restrict our ability to provide services to international customers or to operate our international business profitably, and our overall business and results of operations could be negatively affected by our
foreign activities.

The FCPA and similar anti-bribery laws in other jurisdictions prohibit U.S.-based companies and their
intermediaries from making improper payments for the purpose of obtaining or retaining business. We pursue opportunities in certain parts of the world that experience government corruption to some degree, and, in certain circumstances, compliance
with anti-bribery laws may conflict with local customs and practices. Our policies mandate compliance with these anti-bribery laws. Further, we require our subcontractors, agents and others who work for us or on our behalf to comply with the FCPA
and other anti-bribery laws. Although we have policies and procedures designed to ensure that we, our employees and our agents comply with the FCPA and other anti-bribery laws, there is no assurance that such policies or procedures will protect us
against liability under the FCPA or other laws for actions taken by our agents, employees and intermediaries. If we are found to be liable for FCPA violations (either due to our own acts or our inadvertence, or due to the acts or inadvertence of
others), we could suffer from severe criminal or civil penalties or other sanctions, which could have a material adverse effect on our reputation, business, results of operations or cash flows. In addition, detecting, investigating, and resolving
actual or alleged FCPA violations is expensive and can consume significant time and attention of our senior management.

Our
subcontractors may fail to satisfy their obligations to us or other parties, or we may be unable to maintain these relationships, either of which may have a material adverse effect on our results of operations, cash flows and liquidity.

We depend on subcontractors to complete certain work on some of our projects. There is a risk that we may have
disputes with subcontractors arising from, among other things, the quality and timeliness of work performed by the subcontractor, customer concerns about the subcontractor or our failure to extend existing task orders or issue new task orders under
a subcontract. In addition, if any of our subcontractors fail to deliver on a timely basis the agreed-upon supplies and/or perform the agreed-upon services, then our ability to fulfill our obligations as a prime contractor may be jeopardized. In
addition, the absence of qualified subcontractors with whom we have a satisfactory relationship could adversely affect the quality of our service and our ability to perform under some of our contracts. Any of these factors may have a material
adverse effect on our results of operations, cash flows and liquidity.

We may choose, or be required, to pay our subcontractors even if
our customers do not pay, or delay paying us for the related services.

We use subcontractors to perform portions of
our services and to manage work flow. In some cases, we pay our subcontractors before our customers pay us for the related services. If we choose, or are required, to pay our subcontractors for work performed for customers who fail to pay, or delay
paying us for the related work, we could experience a material decrease in profitability and liquidity.

Increases in the costs of fuel
could reduce our operating margins.

The price of fuel needed to run our vehicles and equipment is unpredictable and
fluctuates based on events outside our control, including geopolitical developments, supply and demand for oil and gas, actions by the OPEC and other oil and gas producers, war and unrest in oil producing countries, regional production patterns and
environmental concerns. Most of our contracts do not allow us to adjust our pricing. Accordingly, any increase in fuel costs could materially reduce our profitability and liquidity.

Our profitability and liquidity could decline if certain customers reduce the amounts they pay for our services or if our customers are unable to pay for our services.

In the past, we incurred significant losses after a number of customers filed for bankruptcy or experienced financial difficulties
following a general economic downturn, in which certain industry factors worsened the impact of the overall economic downturn on those customers. In 2010, 2009 and 2008, total provisions for bad debts aggregated $2.9 million, $2.4 million and $3.5
million, respectively. In 2010, there was no additional provision for bad debts related to customers in bankruptcy. In 2009 and 2008, we recognized additional provisions related to customers in bankruptcy of $0.3 million and $0.9 million,
respectively. As of December 31, 2010, we had remaining receivables from customers undergoing bankruptcy reorganization totaling $0.9 million, of which $0.6 million is included in specific reserves for bad debts, with the remaining amounts
expected to be recovered through secured and unsecured claims and enforcement of liens or bonds.



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Our financial results are based, in part, upon estimates and assumptions that may differ from actual
results.

In preparing our consolidated financial statements in conformity with accounting principles generally
accepted in the United States, a number of estimates and assumptions are made by management that affect the amounts reported in the financial statements. These estimates and assumptions must be made because certain information that is used in the
preparation of our financial statements is either dependent on future events or cannot be calculated with a high degree of precision from data available. In some cases, these estimates are particularly uncertain and we must exercise significant
judgment. Estimates are primarily used in our assessment of revenue recognition, provisions for contract losses, allowances for doubtful accounts, securities available for sale, valuation of goodwill and intangible assets, acquisition-related
contingent consideration, other reserves and accruals, impairment of assets, income taxes, insurance reserves and litigation and contingencies. Actual results could differ materially from the estimates and assumptions that we use, which could have a
material adverse effect on our results of operations, cash flows and liquidity.

We may incur goodwill impairment charges which could
harm our profitability.

When we acquire a business, we record goodwill equal to the excess amount we pay for the
business, including anticipated future liabilities and liabilities assumed, over the fair value of the tangible and intangible assets of that business. As a result of acquisitions, we have $691.6 million of goodwill and other identifiable intangible
assets recorded as of December 31, 2010. We expect to continue to record additions to goodwill in future periods in connection with completed acquisitions, particularly as a result of future earn-out payments for acquisitions completed prior to
December 15, 2008.

We periodically review the carrying values of our goodwill to determine whether such carrying values
exceed their fair market values. We may incur impairment charges related to goodwill in connection with any of our acquisitions in the future if the markets they serve or their businesses deteriorate.

We may incur restructuring or impairment charges, which could reduce our profitability.

From time to time we review our operations in an effort to improve profitability. We could incur charges in the future as a result of:



| |  |  | eliminating service offerings that no longer fit into our business strategy;
| | - |  | ----------------------------------------------------------------------------



| |  |  | reducing or eliminating services or operations that do not produce adequate revenue or margin;
| | - |  | ----------------------------------------------------------------------------------------------



| |  |  | reducing costs of reporting units that need margin improvements; and
| | - |  | --------------------------------------------------------------------



| |  |  | reviewing new business opportunities capable of utilizing our existing human and physical resources.
| | - |  | ----------------------------------------------------------------------------------------------------

Any charges related to restructuring or impairment would be reflected as operating expenses and could materially reduce our profitability
and liquidity.

If we are unable to attract and retain qualified managers and skilled employees, we will be unable to operate
efficiently, which could reduce our revenue, profitability and liquidity.

Our business is labor intensive, and some
of our operations experience a high rate of employee turnover. In addition, given the nature of the highly specialized work we perform, many of our employees are trained in and possess specialized technical skills. At times of low unemployment rates
in the areas we serve, it can be difficult for us to find qualified and affordable personnel. We may be unable to hire and retain a sufficient skilled labor force necessary to support our operating requirements and growth strategy. Our labor
expenses may increase as a result of a shortage in the supply of skilled personnel. We may also be forced to incur significant training expenses if we are unable to hire employees with the requisite skills. Additionally, our business is managed by a
number of key executive and operational officers and is dependent upon retaining and recruiting qualified management. Labor shortages, increased labor or training costs, or the loss of key personnel could materially adversely affect our results of
operations, cash flows and liquidity.



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Certain of our businesses have employees who are represented by a union or are subject to collective
bargaining agreements; the unionized workforce and any related obligations could adversely affect our operations.

Certain of our employees are represented by labor unions and collective bargaining agreements. Although all of these agreements prohibit
strikes and work stoppages, we cannot be certain that strikes or work stoppages will not occur in the future despite the terms of these agreements. Strikes or work stoppages would adversely impact relationships with our customers and could cause us
to lose business and decrease our revenue. Additionally, as current agreements expire, the labor unions may not be able to negotiate extensions or replacements on terms favorable to their members, or at all, or avoid strikes, lockouts or other labor
actions from time to time that may affect their members. Therefore, it cannot be assured that new agreements will be reached with employee labor unions as existing contracts expire, or on terms that we find desirable. Any labor action against us
relating to failure to reach an agreement with employee labor unions could have a material adverse effect on our liquidity, cash flows and results of operations

Our participation in multi-employer pension plans may subject us to liabilities that could materially adversely affect our liquidity, cash flows and results of operations.

Substantially all of our union and collective bargaining agreements require us to participate with other companies in multi-employer
pension plans. To the extent that those plans are underfunded, the Employee Retirement Income Security Act of 1974, as amended by the Multi-Employer Pension Plan Amendments Act of 1980, may subject us to substantial liabilities under those plans if
we withdraw from them or they are terminated. Furthermore, the Pension Protection Act of 2006 added new funding rules generally applicable to plan years beginning after 2007 for multi-employer plans that are classified as endangered,
seriously endangered, or critical status. For a plan in critical status, benefit reductions may apply and/or we may be required to make additional contributions if a plan is determined to be underfunded, which
could materially adversely affect our liquidity, cash flows and results of operations. We have been notified that certain plans to which our subsidiaries contribute are in critical status and require additional contributions in the form
of a surcharge on future benefit contributions required for future work performed by union employees covered by these plans. The amount of additional funds we may be obligated to contribute in the future cannot be estimated.

Our revolving credit facility, senior notes and senior convertible notes impose restrictions on us which may prevent us from engaging in
transactions that might benefit us, including responding to changing business and economic conditions or securing additional financing, if needed.

At December 31, 2010, we had $365 million aggregate principal amount outstanding on our senior notes due 2017 and our senior convertible notes due 2014. We also have a revolving credit facility with
no outstanding balance at December 31, 2010 and availability was approximately $124.2 million, net of outstanding standby letters of credit aggregating $85.8 million.

The terms of our indebtedness contain customary events of default and covenants that prohibit us from taking certain actions without satisfying certain financial tests or obtaining the consent of the
lenders. The prohibited actions include, among other things:



| |  |  | buying back shares in excess of specified amounts;
| | - |  | --------------------------------------------------



| |  |  | making investments and acquisitions in excess of specified amounts;
| | - |  | -------------------------------------------------------------------



| |  |  | incurring additional indebtedness in excess of specified amounts;
| | - |  | -----------------------------------------------------------------



| |  |  | paying cash dividends;
| | - |  | ----------------------



| |  |  | creating certain liens against our assets;
| | - |  | ------------------------------------------



| |  |  | prepaying subordinated indebtedness;
| | - |  | ------------------------------------



| |  |  | engaging in certain mergers or combinations; and
| | - |  | ------------------------------------------------



| |  |  | engaging in transactions that would result in a change of control (as defined in the credit facility and the indenture governing our senior
notes).
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------

Additionally, certain provisions of our convertible notes could make it more expensive for a third
party to acquire us or require us to repurchase the convertible notes for cash when required by the holders, including following a fundamental change (as defined in the indenture).



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Our credit facility requires us to comply with a minimum fixed charge coverage ratio. Should
we be unable to comply with the terms and covenants of our credit facility, we would be required to obtain further modifications of the facility or secure another source of financing to continue to operate our business. A default could also result
in the acceleration of our obligations under the credit facility, or under the indenture relating to the senior notes and the indenture relating to our convertible notes. In addition, these covenants may prevent us from engaging in transactions that
benefit us, including responding to changing business and economic conditions or securing additional financing, if needed. Our business is capital intensive and, to the extent we need additional financing, we may not be able to obtain such financing
at all or on favorable terms, which may materially decrease our profitability, cash flows and liquidity.

Our inability to enforce
non-competition agreements with former principals and key management of the businesses we acquire may adversely affect our operating results, cash flows and liquidity.

In connection with our acquisitions, we generally require that key management and the former principals of the businesses we acquire enter into non-competition agreements in our favor. The laws of each
state differ concerning the enforceability of non-competition agreements. Generally, state courts will examine all of the facts and circumstances at the time a party seeks to enforce a non-competition agreement; consequently, we cannot predict with
certainty whether, if challenged, a court will enforce any particular non-competition agreement. If one or more former principals or members of key management of the businesses we acquire leave and the courts refuse to enforce the non-compete
agreement entered into by such person or persons, we might be subject to increased competition, which could materially and adversely affect our operating results, cash flows and liquidity.

Acquisitions involve risks that could result in a reduction of our operating results, cash flows and liquidity.

We have made, and in the future may continue to make strategic acquisitions or investments. However, we may not be able to identify suitable acquisition or strategic investment opportunities, or may be
unable to obtain the consent of our lenders and therefore, may not be able to complete such acquisition or strategic investments. We may pay for acquisitions or strategic investments with our common stock or with convertible securities, which may
dilute your investment in our common stock, or we may decide to pursue acquisitions, that investors may not agree with. In connection with most of our acquisitions, we have also agreed to substantial earn-out arrangements. To the extent we defer the
payment of the purchase price for any acquisition through a cash earn-out arrangement, it will reduce our cash flows in subsequent periods. In addition, acquisitions may expose us to operational challenges and risks, including:



| |  |  | the ability to profitably manage acquired businesses or successfully integrate the acquired business operations and financial reporting and
accounting control systems into our business;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | increased indebtedness and contingent purchase price obligations associated with an acquisition;
| | - |  | ------------------------------------------------------------------------------------------------



| |  |  | the ability to fund cash flow shortages that may occur if anticipated revenue is not realized or is delayed, whether by general economic or market
conditions, or unforeseen internal difficulties;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the availability of funding sufficient to meet increased capital needs;
| | - |  | -----------------------------------------------------------------------



| |  |  | diversion of managements attention; and
| | - |  | ----------------------------------------



| |  |  | the ability to retain or hire qualified personnel required for expanded operations.
| | - |  | -----------------------------------------------------------------------------------

In addition, acquired companies may have liabilities that we failed, or were unable, to discover in the course of performing due
diligence investigations. We cannot assure you that the indemnification granted to us by sellers of acquired companies will be sufficient in amount, scope or duration to fully offset the possible liabilities associated with businesses or properties
we assume upon consummation of an acquisition. We may learn additional information about our acquired businesses that materially adversely affect us, such as unknown or contingent liabilities and liabilities related to compliance with applicable
laws. Any such liabilities, individually or in the aggregate, could have a material adverse effect on our business.

Failure
to successfully manage the operational challenges and risks associated with, or resulting from, acquisitions could adversely affect our results of operations, cash flows and liquidity. Borrowings or issuances of convertible securities associated
with these acquisitions may also result in higher levels of indebtedness which could impact our ability to service our debt within the scheduled repayment terms.



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Claims, lawsuits and proceedings could reduce our profitability, cash flows and liquidity.

We are subject to various claims, lawsuits and proceedings which arise in the ordinary course of business. These
actions may seek, among other things, compensation for alleged personal injury, workers compensation, employment discrimination, breach of contract, property damage, punitive damages, civil penalties or other losses, consequential damages, or
injunctive or declaratory relief. In addition, pursuant to our service agreements, we generally indemnify our customers for claims related to the services we provide. Claimants may seek large damage awards and defending claims can involve
significant costs. When appropriate, we establish reserves against these items that we believe to be adequate in light of current information, legal advice and professional indemnity insurance coverage, and we adjust such reserves from time to time
according to case developments. If our reserves are inadequate, or if in the future our insurance coverage proves to be inadequate or unavailable, or if there is an increase in liabilities for which we self-insure, we could experience a reduction in
our profitability and liquidity. An adverse determination on any such claim, lawsuit or proceeding could have a material adverse effect on our business, financial condition or results of operations. In addition, claims, lawsuits and proceedings may
harm our reputation or divert management resources away from operating our business.

We have recorded unrealized losses to reduce the
carrying value of certain auction rate securities we hold, and may incur additional impairment charges with respect to auction rate securities in future periods.

The continuing illiquidity of the auction rate securities market may affect our ability to liquidate certain auction rate securities that we classify as securities available for sale on our balance sheet.
Our securities available for sale consist of auction rate securities, which represent interests in pools of student loans guaranteed by the U.S. government under the Federal Family Education Loan Program and a structured finance security. The
structured finance security has an attached credit default swap on corporate debt obligations with remaining terms of 6 years. The structured finance security and the credit default swap are collateralized by investment grade credit-linked notes
made up of floating rate international bank notes or credit card receivable notes. We sold two of our three structured finance securities in the fourth quarter of 2010 for $7.0 million. These securities had a par value of $11.2 million and an
adjusted cost basis of $6.6 million. All of our securities available for sale as of December 31, 2010, with a par value of $22.5 million and an estimated fair value and carrying amount of $19.0 million, had insufficient bidders at the scheduled
rollover dates, indicating that immediate liquidity at par was unavailable. As of December 31, 2010, we had recognized cumulative credit and other losses of $6.9 million on our auction rate securities, net of realized gains, and had cumulative
unrealized losses, net, of $0.8 million on the $19.8 million remaining cost basis of these auction rate securities, which are recognized in other comprehensive income, net of applicable income taxes.

Our valuation is sensitive to market conditions and managements judgment and can change significantly based on the assumptions
used. Factors that may impact our valuation include changes to credit ratings of the applicable securities, and for structured finance securities, changes to the credit ratings of the underlying assets supporting the securities as well as rates of
default of the underlying assets, underlying collateral values, discount rates, counterparty risk and ongoing strength and quality of market credit and liquidity. We are uncertain as to when and if liquidity associated with these investments will
improve, whether we will be able to exit these investments at their respective cost bases, or whether we will incur additional temporary or other-than-temporary losses as a result of these investments. As a result of this uncertainty, our auction
rate securities are classified as a long-term assets as of December 31, 2010.

We have agreed to keep certain liabilities related
to the state Department of Transportation related projects and assets that were sold in February 2007.

Effective
February 1, 2007, we sold our state Department of Transportation related projects and assets. On January 24, 2008, we entered into a settlement agreement with the buyer of our state Department of Transportation projects and assets to
settle previously disclosed warranty, indemnification and other claims primarily relating to work we had performed on the state Department of Transportation projects we sold. In connection with the settlement agreement, the parties also agreed to
further amend and restate the Amended Asset Purchase Agreement effective as of January 24, 2008, which we refer to as the Revised Amended Agreement. In connection with the sale of our state Department of Transportation related
projects and assets and the related settlement, we agreed to keep certain liabilities, mainly related to the cost to maintain and continue certain performance and payment bonds, certain obligations under leases between the parties and certain other
litigation matters. We may also be unable to recover any losses we incur as a result of any third party claims to the extent any third parties seek payment from us directly and we are unable to recover such losses from the buyer pursuant to the
indemnification obligations contained in the Revised Amended Agreement, including any losses resulting from creditor claims, in the event the buyer was financially unable to meet certain obligations.



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##### Table of Contents

Under the terms of the Revised Amended Agreement, the buyer is no longer required to issue a
standby letter of credit in our favor to cover any remaining exposure related to our bonded obligations. Instead, pursuant to the terms of the settlement agreement, the buyer entered into indemnity agreements directly with certain surety bonding
companies in connection with our bonded obligations. Therefore, if the buyer is unable to meet its contractual obligations, the surety bonding company can seek its remedies under the indemnity agreement. If the surety bonding company, however, pays
the amounts due under the bonds, the surety bonding company will seek reimbursement of such payment from us. Accordingly, we may incur losses in the future related to these contingent liabilities if the buyer does not complete the bonded contracts
and we are unable to recover such losses from the buyer pursuant to the indemnification provisions contained in the Revised Amended Agreement. The buyer of the Department of Transportation related projects and assets filed for bankruptcy protection
in October 2009, which increases the likelihood that we will be required to assume certain obligations associated with these projects. At December 31, 2010, we estimated that the remaining cost to complete these state Department of
Transportation projects was $0.1 million on the related $3.0 million in performance and payment bonds. Should actual costs to complete exceed estimates, we could incur future losses which could adversely affect our results of operations, cash flows
and liquidity.

Risks Related to Our Company and Our Common Stock

We have a significant amount of debt. Our substantial indebtedness could adversely affect our business, financial condition and results of operations and our ability to meet our payment obligations.

We have a significant amount of debt and substantial debt service requirements. As of December 31, 2010, we had
approximately $412.6 million of outstanding debt.

This level of debt could have significant consequences on our future
operations, including:



| |  |  | making it more difficult for us to meet our payment and other obligations;
| | - |  | --------------------------------------------------------------------------



| |  |  | our failing to comply with the financial and other restrictive covenants contained in our debt agreements, which could trigger an event of default that
results in all of our debt becoming immediately due and payable;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | reducing the availability of our cash flow to fund working capital, capital expenditures, acquisitions or strategic investments and other general
corporate requirements, and limiting our ability to obtain additional financing for these purposes;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | subjecting us to the risk of increased sensitivity to interest rate increases on our indebtedness with variable interest rates, including borrowings
under our credit facility;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | preventing us from paying dividends;
| | - |  | ------------------------------------



| |  |  | limiting our flexibility in planning for, or reacting to, and increasing our vulnerability to changes in our business, the industry in which we operate
and the general economy; and
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | placing us at a competitive disadvantage compared to our competitors that have less debt or are less leveraged.
| | - |  | ---------------------------------------------------------------------------------------------------------------

Any of the above-listed factors could have an adverse effect on our business, financial condition and results of operations and our
ability to meet our payment obligations.

Our ability to meet our payment and other obligations under our debt instruments
depends on our ability to generate significant cash flow in the future. This, to some extent, is subject to general economic, financial, competitive, legislative and regulatory factors as well as other factors that are beyond our control. We cannot
assure you that our business will generate cash flow from operations, or that future borrowings will be available to us under our credit facility or otherwise, in an amount sufficient to enable us to meet our payment obligations and to fund other
liquidity needs. If we are not able to generate sufficient cash flow to service our debt obligations, we may need to refinance or restructure our debt, sell assets, reduce or delay capital investments, or seek to raise additional capital, and some
of these activities may on terms that are unfavorable or highly dilutive. Our ability to refinance our indebtedness will depend on the capital markets and our financial condition at such time. If we are unable to implement one or more of these
alternatives, we may not be able to meet our payment obligations.



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There may be future sales or other dilution of our equity, which may adversely affect the market price
of our common stock. In connection with certain completed acquisitions and financing transactions, we have issued shares of our common stock or securities that are convertible into shares of our common stock, and in addition, we have the option to
issue shares of our common stock instead of cash as consideration for future earn-out obligations. We may agree to issue additional securities in connection with other future acquisition or financing transactions; which, if issued, would dilute your
share ownership and could lead to volatility in our common stock price.

We grow our business organically as well as
through acquisitions. One method of acquiring companies or otherwise funding our corporate activities is through the issuance of additional equity securities. In connection with certain completed acquisitions, we have the option to issue shares of
our common stock instead of cash for certain earn-out obligations. Additionally, if we exercise our option to acquire EC Source Services LLC (EC Source) pursuant to the terms of the EC Source option agreement we entered into in November
2010, we will be required to deliver to the other EC Source equity holders 5,153,846 shares of our common stock, subject to certain adjustments. Such issuances could have the effect of diluting our earnings per share as well as our existing
shareholders individual ownership percentages and could lead to volatility in our common stock price. Our Amended and Restated Articles of Incorporation provide that we may issue up to a total 145,000,000 shares of common stock, of which
78,215,189 shares were outstanding as of December 31, 2010.

We are not restricted from issuing additional common stock.
The issuance of additional shares of our common stock upon conversion of any of our $215 million aggregate principal amount of convertible notes, in connection with future acquisitions or other issuances of our common stock or convertible
securities, including outstanding options and warrants, or otherwise, will dilute the ownership interest of our common shareholders. Sales of a substantial number of shares of our common stock or other equity-related securities in the public market
could depress the market price of our common stock and impair our ability to raise capital through the sale of additional equity or equity-linked securities. We cannot predict the effect that future sales of our common stock or other equity-related
securities would have on the market price of our common stock.

A small number of our existing shareholders have the ability to
influence major corporate decisions.

Jorge Mas, our Chairman, Jose Mas, our Chief Executive Officer and other members
of the Mas family who are employed by MasTec, beneficially owned approximately 27.6% of the outstanding shares of our common stock as of December 31, 2010. Accordingly, they are in a position to influence:



| |  |  | the vote of most matters submitted to our shareholders, including any merger, consolidation or sale of all or substantially all of our assets;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the nomination of individuals to our Board of Directors; and
| | - |  | ------------------------------------------------------------



| |  |  | a change in our control.
| | - |  | ------------------------

These factors may discourage, delay or prevent a takeover attempt that shareholders might consider in their best interests or that might result in shareholders receiving a premium for their common stock.

The market price of our common stock has been, and may continue to be, highly volatile.

During the three years ended December 31, 2010, our common stock fluctuated from a high of $15.74 per share to a low of $5.55 per
share. We may continue to experience significant volatility in the market price of our common stock. Numerous factors could have a significant effect on the price of our common stock, including:



| |  |  | announcements of fluctuations in our operating results or the operating results of one of our competitors;
| | - |  | ----------------------------------------------------------------------------------------------------------



| |  |  | future sales of our common stock or other securities, including any shares issued in connection with earn-out obligations for any past or future
acquisition;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | announcements by us or one of our competitors of new or terminated customers or new, amended or terminated contracts;
| | - |  | ---------------------------------------------------------------------------------------------------------------------



| |  |  | market conditions for providers of services to communications, utilities and government customers;
| | - |  | --------------------------------------------------------------------------------------------------



| |  |  | conversions or anticipated conversions of our senior convertible notes, or any sales in the public market of any of our common stock issuable upon such
conversion;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------



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| |  |  | changes in recommendations or earnings estimates by securities analysts; and
| | - |  | ----------------------------------------------------------------------------



| |  |  | announcements of acquisitions by us or one of our competitors.
| | - |  | --------------------------------------------------------------

In addition, the stock market has experienced significant price and volume fluctuations in recent years, which have sometimes been
unrelated or disproportionate to operating performance. The market price for our common stock has been volatile, and such volatility could cause the market price of our common stock to decrease and could cause shareholders to lose some or all of
their investment in our common stock.

Our articles of incorporation and certain provisions of Florida law contain anti-takeover
provisions that may make it more difficult to effect a change in our control.

Certain provisions of our articles of
incorporation, by-laws and the Florida Business Corporation Act could delay or prevent an acquisition or change in control and the replacement of our incumbent directors and management, even if doing so might be beneficial to our shareholders by
providing them with the opportunity to sell their shares possibly at a premium over the then market price of our common stock. For example, our Board of Directors is divided into three classes. At any annual meeting of our shareholders, our
shareholders only have the right to appoint approximately one-third of the directors on our Board of Directors. Consequently, it will take at least two annual shareholder meetings to effect a change in control of our Board of Directors, which may
discourage hostile takeover bids. In addition, our articles of incorporation authorize our Board of Directors, without further shareholder approval, to issue preferred stock. The issuance of preferred stock could also dilute the voting power of
holders of our common stock, including the granting of voting control to others, which could delay or prevent an acquisition or change in control.



|ITEM 1B. | UNRESOLVED STAFF COMMENTS
|-------- | -------------------------

None.



|ITEM 2. | PROPERTIES
|------- | ----------

Our corporate
headquarters is a 24,200 square foot leased facility located in Coral Gables, Florida.

As of December 31, 2010, our
operations were conducted from more than 260 locations. None of these facilities is material to our operations because most of our services are performed on customers premises or on public rights of way and suitable alternative locations are
available in substantially all areas where we currently conduct business.

We also own property and equipment that had a net
book value of $180.8 million at December 31, 2010. This property and equipment includes land, buildings, vans, trucks, tractors, trailers, bucket trucks, backhoes, bulldozers, directional boring machines, digger derricks, cranes, networks,
computers, computer software, office and other equipment. Our equipment is acquired from various third-party vendors, none of which we depend upon, and we did not experience any difficulties in obtaining desired equipment in 2010.



|ITEM 3. | LEGAL PROCEEDINGS
|------- | -----------------

Legacy Litigation

We are subject to litigation, some of which dates from the period from 2001 through 2006 and which we refer to as legacy
litigation. The legacy litigation is set forth below.

We are vigorously pursuing claims in excess of $5.0 million against Aon
Risk Services, Inc. of Florida, an insurance broker, for breach of contract and breach of fiduciary duty for the losses arising from a denial of insurance coverage. Discovery is ongoing.

We provided telecommunication infrastructure services to Adesta Communications, Inc. (Adesta) in 2000 and 2001. Adesta filed
for bankruptcy in 2001. Adestas bankruptcy trustee sold Adestas assets in the trust, and we are waiting for a distribution from that trust. Based on our current understanding of the expected distribution, we have reduced our receivable
to approximately $0.9 million, which is recorded in other current assets on our consolidated balance sheet as of December 31, 2010.



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##### Table of Contents

The labor union representing the workers of Sistemas e Instalaciones de
Telecomunicación S.A. (Sintel), a former MasTec subsidiary that was sold in 1998, filed a claim that initiated an investigative action with the Audiencia Nacional, a Spanish federal court, against Telefonica and dozens of other
defendants including current and former officers and directors of MasTec (including Jorge Mas, Chairman of the Companys Board of Directors) relating to Sintels 2000 bankruptcy. The union alleged Sintel and its creditors were damaged in
the approximate amount of 300 million euros (approximately $398 million as of December 31, 2010). In June 2009, the Audiencia Nacional issued an order that the trial phase was commencing against the MasTec defendants and other defendants.
In June 2010, the investigative court issued an order for letters rogatory to the United States for assistance in obtaining evidence from and seizing the assets of the MasTec defendants and MasTec. We believe that the order violates U.S. and
international law and we are opposing the order. We and the MasTec defendants believe the claims are frivolous and are vigorously defending the matter. We will vigorously defend any potential liability. Neither MasTec nor Jorge Mas were directly
involved in any of the transactions the Spanish prosecutor alleges led to Sintels bankruptcy. Our directors and officers insurance carrier has agreed to fund legal expenses under a reservation of rights. The amount of loss to us,
if any, relating to this matter cannot presently be determined.

In addition to the legacy litigation matters discussed above,
we are subject to a variety of legal cases, claims and other disputes that arise from time to time in the ordinary course of business. We cannot provide assurance that it will be successful in recovering all or any of the potential damages it has
claimed or in defending claims against it.

Accrued aggregate liabilities related to the matters described above and other
litigation matters amounted to $2.4 million at December 31, 2010. See Note 16 - Commitment and Contingencies in the notes to the consolidated financial statements.



|ITEM 4. | SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS
|------- | ---------------------------------------------------

None.

PART II



|ITEM 5. | MARKET FOR THE REGISTRANTS COMMON EQUITY, RELATED SHAREHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES
|------- | ----------------------------------------------------------------------------------------------------------------

Market Information

Our
common stock is listed on the New York Stock Exchange under the symbol MTZ. The following table sets forth, for the quarters indicated, the high and low sale prices of our common stock, as reported by the New York Stock Exchange.



|               |  |                                  |       |  |      |   |       |      |  |   |       |  |  |   |       | 
|-------------- |  | -------------------------------- | ----- |  | ---- | - | ----- | ---- |  | - | ----- |  |  | - | ----- | 
|               |  | For the Years Ended December 31, |      
|               |  | 2010                             |       |  | 2009 |  
|               |  | High                             |       |  | Low  |   |       | High |  |   | Low   | 
|First Quarter  |  | $                                | 13.92 |  |      | $ | 11.73 |      |  | $ | 13.00 |  |  | $ | 8.90  | 
|Second Quarter |  | $                                | 13.24 |  |      | $ | 9.33  |      |  | $ | 14.00 |  |  | $ | 11.26 | 
|Third Quarter  |  | $                                | 11.37 |  |      | $ | 9.26  |      |  | $ | 12.78 |  |  | $ | 9.15  | 
|Fourth Quarter |  | $                                | 15.48 |  |      | $ | 10.04 |      |  | $ | 13.45 |  |  | $ | 11.11 | 

Holders. As of February 21, 2011, there were 4,192 shareholders of record of our common stock.



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Performance Graph

The performance graph below compares the cumulative total returns for our common stock with the cumulative total return (including reinvestment of dividends) of the Standard and Poors 500 Composite
Stock Index (S&P 500), and with that of our Peer Group, comprised of Dycom Industries, Inc., MYR Group, Inc., Quanta Services, Inc. and Pike Electric, Inc. We added MYR Group, Inc. to our Peer Group comparison beginning in 2010.

The graph assumes an investment of $100 in our common stock and in each of the respective indices, for the period from December 31,
2005 to December 31, 2010. The comparisons in the graph are required by the SEC and are not intended to forecast or be indicative of possible future performance of our common stock.

The performance graph shall not be deemed incorporated by reference by any general statement incorporating by reference this annual
report into any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934 except to the extent we specifically incorporate this information by reference, and shall not otherwise be deemed filed under such acts.

LOGO

Dividends. We have never paid any cash dividends and do not anticipate paying any cash
dividends in the foreseeable future. We intend to retain any future earnings for reinvestment. Our Board of Directors will make any future determination as to the payment of dividends at its discretion, and this determination will depend upon our
operating results, financial condition and capital requirements, general business conditions and such other factors that the Board of Directors considers relevant. In addition, our credit agreements prohibit us from paying cash dividends or making
other distributions of our common stock without prior consent of the lender. The indenture governing our senior notes also contains covenants that restrict our ability to make certain payments including the payment of dividends. See Item 7.
Managements Discussion and Analysis of Financial Condition and Results of Operations - Financial Condition, Liquidity and Capital Resources.



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##### Table of Contents

Purchases of Common Stock. The following table provides information about
repurchases of our common stock during the three month period ended December 31, 2010:



|                                           |  |                                    |       |  |                            |   |       |                                                                     |  |  |                                                                              |  |  |  |   | 
|------------------------------------------ |  | ---------------------------------- | ----- |  | -------------------------- | - | ----- | ------------------------------------------------------------------- |  |  | ---------------------------------------------------------------------------- |  |  |  | - | 
|Period                                     |  | Total Numberof SharesPurchased
(1) |       |  | AveragePrice Paidper Share |   |       | Total Number ofShares Purchased asPart of
PubliclyAnnounced Program |  |  | Approximate DollarValue of Shares thatMay Yet be 
Purchasedunder the Program | 
|                                           |  |                                    |       | 
|October 1, 2010 through October 31, 2010   |  |                                    |      |  |                            | $ |      |                                                                     |  |  |                                                                             |  |  |  |  | 
|November 1, 2010 through November 30, 2010 |  |                                    |      |  |                            |   |      |                                                                     |  |  |                                                                             |  |  |  |  | 
|December 1, 2010 through December 31, 2010 |  |                                    | 1,289 |  |                            |   | 14.03 |                                                                     |  |  |                                                                             |  |  |  |  | 



| | (1) | Represents shares of common stock withheld for income tax purposes in connection with shares of restricted stock issued to certain employees and directors. | 
| | --- | ----------------------------------------------------------------------------------------------------------------------------------------------------------- | 



|ITEM 6. | SELECTED FINANCIAL DATA
|------- | -----------------------

The following table states our selected consolidated financial data, which has been derived from our audited consolidated financial
statements. The table reflects our consolidated results of operations for the periods indicated. Our consolidated results of operations are not necessarily comparable from period to period due to the impact of recent acquisitions. See the Notes to
Consolidated Financial Statements, Note 4 - Acquisitions and Joint Ventures for further details. All periods presented reflect our Canadian operations and state Department of Transportation projects as discontinued operations. See the Notes to the
Consolidated Financial Statements, Note 19 - Discontinued Operations.

The following selected financial data should be read
together with our consolidated financial statements and notes thereto as well as Item 7. Managements Discussion and Analysis of Financial Condition and Results of Operations.



|                                                                   |  |                                         |         |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   |       |  
|------------------------------------------------------------------ |  | --------------------------------------- | ------- | - | ---- | - | ------- | ---- |  | - | ------- | - |  | ---- | ------- | - |  | - | ----- | -
|                                                                   |  | Year Ended December 31,                 |        
|                                                                   |  | 2010                                    |         |   | 2009 |   |         | 2008 |  |   | 2007    |   |  | 2006 |        
|                                                                   |  | (In millions, except per share amounts) |        
|Statement of Operations Data                                       |  |                                         |         |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   |       |  
|Revenue                                                            |  | $                                       | 2,308.0 |   |      | $ | 1,623.5 |      |  | $ | 1,378.7 |   |  | $    | 1,037.8 |   |  | $ | 940.4 |  
|Costs of revenue, excluding depreciation and amortization          |  | $                                       | 1,938.9 |   |      | $ | 1,376.1 |      |  | $ | 1,179.2 |   |  | $    | 891.6   |   |  | $ | 808.1 |  
|Income from continuing operations before non-controlling interests |  | $                                       | 90.4    |   |      | $ | 70.7    |      |  | $ | 66.6    |   |  | $    | 6.3     |   |  | $ | 40.1  |  
|Loss from discontinued operations, net of tax                      |  | $                                       |        |   |      | $ |        |      |  | $ | (0.8    | ) |  | $    | (13.6   | ) |  | $ | (90.4 | )
|Net income (loss)                                                  |  | $                                       | 90.4    |   |      | $ | 70.7    |      |  | $ | 65.8    |   |  | $    | (7.3    | ) |  | $ | (50.3 | )
|Net loss from non-controlling interests                            |  | $                                       | (0.1    | ) |      | $ |        |      |  | $ |        |   |  | $    |        |   |  | $ |      |  
|Net income (loss) attributable to MasTec                           |  | $                                       | 90.5    |   |      | $ | 70.7    |      |  | $ | 65.8    |   |  | $    | (7.3    | ) |  | $ | (50.3 | )
|Basic net income (loss) per share attributable to MasTec:          |  |                                         |         |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   |       |  
|Continuing operations                                              |  | $                                       | 1.19    |   |      | $ | 0.93    |      |  | $ | 0.98    |   |  | $    | 0.10    |   |  | $ | 0.63  |  
|Discontinued operations                                            |  | $                                       |        |   |      | $ |        |      |  | $ | (0.01   | ) |  | $    | (0.21   | ) |  | $ | (1.42 | )
|Total basic net income (loss) per share attributable to MasTec     |  | $                                       | 1.19    |   |      | $ | 0.93    |      |  | $ | 0.97    |   |  | $    | (0.11   | ) |  | $ | (0.79 | )
|Diluted net income (loss) per share attributable to MasTec:        |  |                                         |         |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   |       |  
|Continuing operations                                              |  | $                                       | 1.05    |   |      | $ | 0.90    |      |  | $ | 0.97    |   |  | $    | 0.09    |   |  | $ | 0.62  |  
|Discontinued operations                                            |  | $                                       |        |   |      | $ |        |      |  | $ | (0.01   | ) |  | $    | (0.20   | ) |  | $ | (1.39 | )
|Total diluted net income (loss) per share attributable to MasTec   |  | $                                       | 1.05    |   |      | $ | 0.90    |      |  | $ | 0.96    |   |  | $    | (0.11   | ) |  | $ | (0.77 | )
|                                                                   | 
|                                                                   |  | Year Ended December 31,                 |        
|                                                                   |  | 2010                                    |         |   | 2009 |   |         | 2008 |  |   | 2007    |   |  | 2006 |        
|                                                                   |  | (In millions)                           |        
|Balance Sheet Data                                                 |  |                                         |         |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   |       |  
|Working capital                                                    |  | $                                       | 235.1   |   |      | $ | 202.5   |      |  | $ | 105.3   |   |  | $    | 163.8   |   |  | $ | 164.0 |  
|Property and equipment, net                                        |  | $                                       | 180.8   |   |      | $ | 198.8   |      |  | $ | 158.0   |   |  | $    | 81.9    |   |  | $ | 61.2  |  
|Total assets                                                       |  | $                                       | 1,655.8 |   |      | $ | 1,382.2 |      |  | $ | 1,090.9 |   |  | $    | 710.7   |   |  | $ | 646.1 |  
|Total debt                                                         |  | $                                       | 412.6   |   |      | $ | 438.4   |      |  | $ | 304.3   |   |  | $    | 163.0   |   |  | $ | 130.2 |  
|Total shareholders equity                                         |  | $                                       | 653.2   |   |      | $ | 528.2   |      |  | $ | 443.1   |   |  | $    | 314.6   |   |  | $ | 304.7 |  



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|ITEM 7. | MANAGEMENTS DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
|------- | -------------------------------------------------------------------------------------

The following discussion and analysis of our financial condition and results of operations should be read in conjunction with our
historical consolidated financial statements and related notes thereto in Item 8. Financial Statements and Supplementary Data. The discussion below contains forward-looking statements that are based upon our current expectations and
are subject to uncertainty and changes in circumstances. Actual results may differ materially from these expectations due to inaccurate assumptions and known or unknown risks and uncertainties, including those identified in Cautionary
Statement Regarding Forward-Looking Statements and Item 1A. Risk Factors.

We begin with an overview of
our business, recent developments and financial results, a discussion of economic, industry and market factors and a summary of our revenue producing activities and related costs, along with a discussion of key metrics our management team uses when
evaluating our performance. This overview is followed by a summary of critical accounting policies and estimates that we believe are important to understanding the assumptions and judgments incorporated in our reported financial results as well as
our 2011 outlook. We then provide a more detailed analysis of our results of operations, financial condition, liquidity and capital resources.

Business Overview

We
are a leading national infrastructure construction company operating mainly throughout the United States across a range of industries. Our activities include, but are not limited to, the engineering, building, installation, maintenance and upgrade
of energy, communication and utility infrastructure, including: electrical utility transmission and distribution, wind farms, solar farms, other renewable energy, natural gas and petroleum pipeline infrastructure, wireless, wireline and satellite
communication, industrial infrastructure and water and sewer systems. Our customers are primarily in the utility, communications and government industries.

Including our predecessor companies, we have been in business for more than 80 years. We offer our services primarily under the MasTec service mark and operate through a network of over 260 locations and
approximately 9,400 employees as of December 31, 2010. We have consistently ranked among the top specialty contractors by Engineering News-Record over the past five years.

We serve a diversified domestic customer base, and our top ten customers include some of the largest communications
and utility companies in the United States, including DIRECTV®, AT&T, El Paso Corporation, Enbridge, Edison
Mission Energy, Tenaska Energy, Duke Energy, Talisman Energy, Great River Energy and CenturyLink. We have longstanding relationships with many customers and often provide services under multi-year master service agreements and other service
agreements. Because our business is concentrated among relatively few major customers, our business could be negatively impacted if the amount of business we obtain from these customers is reduced, or if we complete the required work on projects and
cannot replace them with similar projects. Revenue concentration information, as a percent of total consolidated revenue, is as follows:



|                                 |  |                                  |    |   |      |  |    |      |  |  |    |  
|-------------------------------- |  | -------------------------------- | -- | - | ---- |  | -- | ---- |  |  | -- | -
|                                 |  | For the Years Ended December 31, |   
|                                 |  | 2010                             |    |   | 2009 |  |    | 2008 | 
|Revenue from top ten customers   |  |                                  | 72 | % |      |  | 72 | %    |  |  | 72 | %
|                                 |  |                                  |   
|Revenue from specific customers: |  |                                  |    |   |      |  |    |      |  |  |    |  
|DIRECTV®                         |  |                                  | 24 | % |      |  | 30 | %    |  |  | 34 | %
|AT&T                             |  |                                  | 20 | % |      |  | 16 | %    |  |  | 12 | %

Our
relationship with DIRECTV® is based upon two agreements to provide installation and maintenance services for
DIRECTV® and, in support of the installation business, to provide marketing and sales services on behalf of
DIRECTV®. Refer to Recent Developments for additional information regarding our purchase option
agreement with Red Ventures LLC, which could reduce future revenues from DIRECTV®. Our relationship with
AT&T is primarily based upon master service agreements, other service agreements and construction/installation contracts for both AT&Ts wireless and wireline infrastructure businesses.

We have actively pursued a diversification and expansion strategy since 2007. This strategy has enabled us to deepen our presence in key
markets and expand our service offerings through several complementary acquisitions and investments in the wind energy, wireless, oil and natural gas pipeline and high voltage transmission markets, among others. In addition to integration and growth
opportunities associated with acquired businesses and the corresponding end markets, we continue to seek new opportunities in traditional business areas, such as telecommunications and install-to-the-home services. While we expect to continue to
grow our business, our future revenues cannot be assured.



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Recent Developments

In November 2010, we entered into a membership interest purchase agreement and invested $10 million to purchase a 33% voting equity interest in EC Source Services LLC (EC Source) and
acquired a two-year option (the Merger Option) that grants us the right, but not the obligation, to acquire EC Source via merger. EC Source is an extra high voltage specialty transmission contractor, and our investment will be utilized
to support working capital and bonding requirements as well as equipment purchases, as necessary, to meet the demands of EC Sources existing and future projects. If we exercise our option to acquire the remaining 67% interest in EC Source, we
will be required to issue to the other EC Source equity holders an aggregate of 5,153,846 shares of MasTec common stock, subject to certain purchase price adjustments, plus a five-year earn-out, payable in MasTec shares, cash, or a combination
thereof, at our election, based on EC Sources earnings before interest, taxes, depreciation and amortization (EBITDA), generally equal to 20% of EC Sources annual EBITDA in excess of $15 million. The MasTec shares will be
subject to transfer restrictions, which lapse 25% on the first anniversary of the closing of the EC Source acquisition, an additional 25% on the second anniversary and the remaining 50% on the third anniversary.

In December 2010, we entered into an amendment to the asset purchase agreement with the seller of Nsoro, LLC (Nsoro). Under
the revised terms, we paid and delivered to the seller a one time $40 million cash payment plus 1,875,000 shares of MasTec common stock, which are restricted for one-year from the date of issuance. These shares were valued at $27 million, based on
the average market price five days before and after the terms of the amendment were agreed to and announced. The amendment effectively reduces potential future earn-out payments in exchange for upfront consideration. The total amount of upfront
consideration, valued at $67 million, was recorded as additional goodwill. Future annual earn-out payments for the five years beginning in 2011 will be reduced to 27.5% of domestic annualized earnings before tax in excess of $40 million. Earn-outs
will be payable, at our option, in either cash, shares of MasTec common stock, or any combination thereof.

In January 2011,
we completed a debt exchange offer associated with our outstanding 4.0% senior convertible notes and 4.25% senior convertible notes (together, the Original Notes). For an exchange fee of 50 basis points, or 0.5% of the aggregate
exchanged principal of Original Notes, we exchanged the Original Notes tendered for a like principal amount of new 4.0% senior convertible notes or 4.25% senior convertible notes, as applicable (together, the New Notes), that are
substantially similar to the Original Notes in all material respects, except that the New Notes have an optional physical, cash or combination settlement feature and contain certain conditional conversion features. Upon completion of the exchange
offer, $100.6 million of the original 4% senior convertible notes and $97.0 million of the 4.25% senior convertible notes, or 87.5% and 97%, respectively, were canceled and exchanged for an identical principal amount of New Notes, plus exchange fees
of approximately $1.0 million. Following the exchange offer, $14.4 million and $3.0 million of the original 4.0% and 4.25% notes, respectively, remain outstanding.

Because the New Notes have an optional cash settlement feature, and we intend to settle the principal amount in cash, the conversion shares underlying the principal amount of the New Notes will not be
included in our diluted share count in the future. If, however, the average stock price per share exceeds the $15.76 conversion price for the new 4.0% notes or the $15.48 conversion price for the new 4.25% notes, then the resulting amount, in
shares, of any premium will be included in our diluted share count. As a result, we anticipate a reduction in our diluted share count, along with a reduction in the dilutive impact of our convertible notes on earnings per share beginning in 2011.
Notwithstanding our present intention to settle conversions of our New Notes in cash, we cannot assure you that we will be able to do so due to restrictions in our credit facility, which prior to its expiration in May 2013, without the consent of
the lenders thereunder, prohibits us from borrowing under the credit facility to settle any conversions of the New Notes and from paying more than $10 million in the aggregate from cash on hand to settle conversions of the New Notes.

In February 2011, we entered into an amended and restated purchase option agreement with Red Ventures and certain of
Red Ventures affiliates, which grants Red Ventures a purchase option to acquire our wholly owned subsidiary, DirectStar, and its subsidiaries. As amended, the purchase option is exercisable from March 1, 2012 through November 30,
2012 and allows Red Ventures to pay up to 35% of the option purchase price in the form of a secured note with a one year term. In connection with the amendment to the purchase option, we agreed to increase certain commissions that DirectStar
presently pays to Red Ventures for managing the DirectStar business. See Note 4 - Acquisitions and Joint Ventures in the notes to the consolidated financial statements for additional details. DirectStar, in support of the DIRECTV® installation business, provides marketing and sales services on behalf of DIRECTV®. Should Red Ventures execute their purchase option agreement, our revenues from DIRECTV® would be reduced. Without DirectStars revenues from services provided to DIRECTV®, our DIRECTV® revenues would have been reduced from 24% to 19% of total consolidated revenue for the year ended December 31, 2010.



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Overview of Financial Results

Our revenue grew over 42% in 2010, including organic revenue growth of 24% versus 2009. Acquisitions contributed an additional 18% to
revenue growth. We experienced strong growth from customers in the wireless, pipeline, install to the home and renewable industries. Net income and diluted earnings per share increased by approximately $19.8 million and $0.15 per diluted share, or
28% and 17.2%, respectively, from 2009. Our net income growth was driven by several factors: revenue growth as previously discussed; improvement in our gross margin percentage; and improved leveraging of depreciation, amortization and general and
administrative expenses as a percentage of revenue. These increases were offset by a large increase in the income tax provision. In 2009, we released our valuation allowance that was initially established against certain deferred tax assets, which
reduced our total income tax expense during that year. As a result, for the year ended December 31, 2010, our effective federal and state tax rate was 41.3%, versus an effective tax rate of 10.6% in the prior year, resulting in an increase of
$55 million in income tax expense. Diluted earnings per share increased as a result of higher net income, however, the per share impact was partially offset by an increase in average diluted shares outstanding. Higher convertible debt balances
versus the prior year led to higher average diluted common shares outstanding.

Economic, Industry and Market Factors

We recognize that we and our customers operate in a challenging business environment. We closely monitor our customers and the effect that
changes in economic and market conditions may have on them. Certain of our customers have reduced capital spending since the economic downturn and these conditions could affect demand for some of our services in the near-term. Despite the
challenging business environment, our business experienced strong performance during 2010, driven by high end-user demand in certain industries, such as wireless and satellite communications. In addition, our business was favorably impacted by
strong demand for new infrastructure in the utilities and energy industries, as well as for ongoing maintenance and upgrades to existing infrastructure in those industries, among others.

General economic conditions, as well as the highly competitive nature of our industry, have resulted in increased pricing pressure for
the services we provide. Work is often awarded through a bidding process. As a result, price is often a principal factor in the selection process. In the face of increased pricing pressure, we strive to maintain our profit margins through
productivity improvements and cost reduction programs.

In addition, we operate in an industry affected by market and
regulatory impacts beyond our control. Changes in renewable portfolio standards, new or changing regulatory requirements affecting the industries we serve, and/or changes in technology can impact demand for our services. In addition, fluctuations in
market prices for oil, gas and other fuel sources can impact demand for our pipeline and renewable energy construction services. Our results for the year ended December 31, 2010 reflect strong growth from pipeline projects, in part due to
favorable market conditions, which has resulted in increased demand for our services. We also experienced strong growth from renewable energy projects despite lower levels of market activity in wind power installation in 2010 as compared with 2009.

Our growth is affected by numerous factors, among them general economic and business conditions, industry trends impacting
our customers, our competitive position and our ability to successfully integrate acquired businesses. We actively monitor economic, industry and market factors affecting our business, however, we cannot predict the impact such factors may have on
our results of operations, liquidity and cash flows.

Revenue

We provide engineering, building, installation, maintenance and upgrade services to our customers, which are companies in the communications and utilities industries, as well as government customers.
Revenue for customers in these industries for the periods indicated is as follows (in millions):



|               |  |                         |         |  |      |  |     |      |  |   |         |  |  |  |     |   |  |   |         |  |  |  |     |  
|-------------- |  | ----------------------- | ------- |  | ---- |  | --- | ---- |  | - | ------- |  |  |  | --- | - |  | - | ------- |  |  |  | --- | -
|               |  | Year Ended December 31, |        
|               |  | 2010                    |         |  | 2009 |  |     | 2008 | 
|Communications |  | $                       | 1,222.1 |  |      |  | 53  | %    |  | $ | 951.2   |  |  |  | 59  | % |  | $ | 860.0   |  |  |  | 62  | %
|Utilities      |  |                         | 1,046.2 |  |      |  | 45  | %    |  |   | 595.3   |  |  |  | 37  | % |  |   | 442.3   |  |  |  | 32  | %
|Government     |  |                         | 39.7    |  |      |  | 2   | %    |  |   | 77.0    |  |  |  | 4   | % |  |   | 76.4    |  |  |  | 6   | %
|               |  |                         |         |  |      |  |     |      |  |   |         |  |  |  |     |   |  |   |         |  |  |  |     |  
|               |  | $                       | 2,308.0 |  |      |  | 100 | %    |  | $ | 1,623.5 |  |  |  | 100 | % |  | $ | 1,378.7 |  |  |  | 100 | %
|               |  |                         |         |  |      |  |     |      |  |   |         |  |  |  |     |   |  |   |         |  |  |  |     |  



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About half of our revenue is derived from projects performed under service agreements and
master service agreements, which are generally multi-year agreements. Certain of our master service agreements are exclusive up to a specified dollar amount per work order for each defined geographic area, but do not obligate our customers to
undertake any infrastructure projects or other work with us. Work performed under master service and other service agreements is typically generated through work orders, each of which is performed for a fixed fee. Services provided under master
service and other service agreements range from engineering, project management and installation work to maintenance and upgrade services. These master service agreements and other service agreements are frequently awarded on a competitive bidding
basis, although customers are sometimes willing to negotiate contract extensions beyond their original terms without re-bidding. Our master service agreements and other service agreements have various terms, depending upon the nature of the services
provided, and typically provide for termination on short or no advance notice.

The remainder of our work is generated
pursuant to contracts for specific projects or jobs that may require the construction and installation of an entire infrastructure system or specified units within an infrastructure system. Customers are billed with varying frequency, generally
monthly or upon attaining specific milestones. Such contracts generally include retainage provisions under which 2% to 15% of the contract price is withheld from us until the work has been completed and accepted by the customer.

Revenue by type of contract for the periods indicated is as follows (in millions):



|                                             |  |                         |         |  |      |  |     |      |  |   |         |  |  |  |     |   |  |   |         |  |  |  |     |  
|-------------------------------------------- |  | ----------------------- | ------- |  | ---- |  | --- | ---- |  | - | ------- |  |  |  | --- | - |  | - | ------- |  |  |  | --- | -
|                                             |  | Year Ended December 31, |        
|                                             |  | 2010                    |         |  | 2009 |  |     | 2008 | 
|Master service and other service agreements  |  | $                       | 1,266.0 |  |      |  | 55  | %    |  | $ | 934.3   |  |  |  | 58  | % |  | $ | 854.7   |  |  |  | 62  | %
|Installation/construction project agreements |  |                         | 1,042.0 |  |      |  | 45  | %    |  |   | 689.2   |  |  |  | 42  | % |  |   | 524.0   |  |  |  | 38  | %
|                                             |  |                         |         |  |      |  |     |      |  |   |         |  |  |  |     |   |  |   |         |  |  |  |     |  
|                                             |  | $                       | 2,308.0 |  |      |  | 100 | %    |  | $ | 1,623.5 |  |  |  | 100 | % |  | $ | 1,378.7 |  |  |  | 100 | %
|                                             |  |                         |         |  |      |  |     |      |  |   |         |  |  |  |     |   |  |   |         |  |  |  |     |  

As shown in the table above, we have an increasing proportion of revenues from non-recurring,
project specific work. If we are not able to replace work from completed projects with new project work, we may not be able to maintain our current revenue levels, or our current level of capacity and resource utilization. We actively review our
backlog of project work and take appropriate action to minimize such exposure.

Costs of Revenue

Our costs of revenue include the costs of providing services or completing the projects under our contracts, including, among others,
operations payroll and benefits, subcontractor costs, equipment rental, fuel, materials not provided by our customers, and insurance. Profitability will be reduced if actual costs to complete a project exceed original estimates on fixed price and
installation/construction service agreements. Estimated losses on contracts are recognized immediately when estimated costs to complete a project exceed the remaining revenue to be received over the remainder of the contract.

General and Administrative Expenses

General and administrative expenses include all costs of our management and administrative personnel, provisions for bad debts, rent, utilities, travel, business development efforts and back office
administration such as financial services, insurance, administration, professional costs and clerical and administrative overhead.

Discontinued Operations

Effective February 2007, we sold the state Department of Transportation related projects and net assets. As a result of this sale, we
recorded impairment charges totaling $2.9 million during the year ended December 31, 2007. On January 24, 2008, we entered into a settlement with the buyer of our state Department of Transportation projects and assets to settle previously
disclosed warranty, indemnification and other claims primarily relating to work we had performed on the projects that were sold. As a result of the settlement, we recorded a charge of $6.0 million, which was reflected as a loss from discontinued
operations for the year ended December 31, 2007. In October 2009, the buyer filed for bankruptcy protection, which increases the likelihood that we will be required to assume certain obligations associated with these projects.

The financial information in this annual report on Form 10-K reflects the above operations as discontinued operations.



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Financial Metrics

Members of our senior management team regularly review key performance metrics and the status of operating initiatives within our business. These key performance indicators include:



| |  |  | revenue and profitability on an overall and individual project basis;
| | - |  | ---------------------------------------------------------------------



| |  |  | monthly, quarterly and annual changes in revenue and profitability on an overall and individual project basis;
| | - |  | --------------------------------------------------------------------------------------------------------------



| |  |  | revenues by customer, by industry and by contract type;
| | - |  | -------------------------------------------------------



| |  |  | costs of revenue, general and administrative expenses, depreciation and amortization, tax and interest expense as a percentage of revenue;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | earnings before interest, taxes, depreciation and amortization (EBITDA), and EBITDA as a percentage of revenue;
| | - |  | -----------------------------------------------------------------------------------------------------------------



| |  |  | days sales and days payable outstanding;
| | - |  | ----------------------------------------



| |  |  | interest and debt service coverage ratios;
| | - |  | ------------------------------------------



| |  |  | liquidity and cash flows;
| | - |  | -------------------------



| |  |  | safety results and productivity; and
| | - |  | ------------------------------------



| |  |  | customer service metrics on an individual project basis.
| | - |  | --------------------------------------------------------

We analyze this information periodically through operating reviews, which include detailed discussions of proposed investments in new business opportunities or property and equipment, integration efforts
and cost reduction efforts. Measuring these key performance indicators is an important tool used by management to make operational decisions. These tools enable our management to make informed and timely decisions about the allocation of costs and
resources, which we believe can help us improve our performance.

Critical Accounting Policies and Estimates

This discussion and analysis of our financial condition and results of operations is based upon our consolidated financial statements,
which have been prepared in accordance with accounting principles generally accepted in the United States. The preparation of these financial statements requires us to make estimates and judgments that affect the amounts reported in our financial
statements and the accompanying notes. On an on-going basis, we evaluate our estimates, including those related to revenue recognition, provisions for contract losses, allowances for doubtful accounts, securities available for sale, goodwill and
intangible assets, acquisition-related contingent consideration, reserves and accruals, impairment of assets, income taxes, insurance reserves and litigation and contingencies. We base our estimates on historical experience and on various other
assumptions that we believe to be reasonable under the circumstances, the results of which form the basis of making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. As management
estimates, by their nature, involve judgment regarding future uncertainties, actual results may differ from these estimates if conditions change or if certain key assumptions used in making these estimates ultimately prove to be materially
incorrect.

We believe the following accounting policies are the most critical in the preparation of our consolidated
financial statements as they are both important to the portrayal of our financial condition and they require significant or complex judgment and estimates on the part of management. Refer to the Notes to Consolidated Financial Statements, Note 2 -
Summary of Significant Accounting Policies, for further description of our significant accounting policies.

Our critical
accounting policies are reviewed frequently with the Audit Committee of the Board of Directors.

Revenue Recognition

Revenue and related costs for master and other service agreements billed on a time and materials basis are recognized as the services are
rendered. Services are also performed under master and other service agreements billed on a fixed fee basis. Under fixed fee master service and similar type service agreements, we furnish various specified units of service for a separate fixed price
per unit of service. For service agreements on a fixed fee basis, profitability will be reduced if the actual costs to complete each unit exceed original estimates.



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Revenues from fixed price contracts are recognized using the percentage-of-completion
method, measured by the percentage of costs incurred to date to total estimated costs for each contract. These contracts provide for a fixed amount of revenues for the entire project. Such contracts provide that the customer accept completion of
progress to date and compensate us for services rendered, which may be measured in terms of units installed, hours expended or some other measure of progress. Contract costs include all direct materials, labor and subcontract costs and those
indirect costs related to contract performance, such as indirect labor, supplies, tools, repairs and the operational costs of capital equipment (excluding depreciation). Much of the materials associated with our work are customer-furnished and are
therefore not included in contract revenues and costs. The cost estimation process is based on the professional knowledge and experience of our engineers, project managers and financial professionals. Changes in job performance, job conditions and
final contract settlements are factors that influence managements assessment of total contract value and the total estimated costs to complete those contracts and therefore, our profit recognition. Changes in these factors may result in
revisions to costs and income, and their effects are recognized in the period in which the revisions are determined. Provisions for losses on uncompleted contracts are made in the period in which such losses are determined to be probable and the
amount can be reasonably estimated.

We may incur costs subject to change orders, whether approved or unapproved by the
customer, and/or claims related to certain contracts. We determine the probability that such costs will be recovered based upon evidence such as engineering studies and legal opinions, past practices with the customer, specific discussions,
correspondence or preliminary negotiations with the customer. We treat items as a cost of contract performance in the period incurred if it is not probable that the costs will be recovered, or defer costs and/or recognize revenue if it is probable
that the contract price will be adjusted and can be reliably estimated. As of December 31, 2010, change orders and/or claims that were in the process of being negotiated in the normal course of business for which costs have been deferred or
that had been included as contract price adjustments were immaterial.

Billings in excess of costs and estimated earnings on
uncompleted contracts are classified as current liabilities. Any costs and estimated earnings in excess of billings are classified as current assets. Work in process on contracts is based on work performed but not yet billed to customers as per
individual contract terms.

Allowance for Doubtful Accounts

We maintain allowance for doubtful accounts for estimated losses resulting from the inability of our customers to make required payments. We analyze the collectibility of accounts receivable and the
adequacy of the allowance for doubtful accounts on a regular basis, based on the aging of account balances, historical bad debt experience, customer concentrations, customer credit-worthiness, customer financial condition and credit reports,
availability of mechanics and other liens, existence of payment bonds and other sources of payment and current economic trends for reporting units where losses have occurred historically and are considered to be ordinary course, reserves are
established for anticipated losses based on statistical analysis of the accounts receivable portfolio. For reporting units where historical losses have been immaterial, an increase in the allowance for doubtful accounts is recorded when it is
probable a receivable is not collectible and the loss can be reasonably estimated. Amounts are written off against the allowance when deemed uncollectible. If our estimates of the collectibility of accounts receivable change, or should customers
experience unanticipated financial difficulties, or if anticipated recoveries in existing bankruptcies or other work-out situations fail to materialize, adjustments to the allowance for doubtful accounts may be required, which could reduce our
profitability and cash flows.

Our estimates for the allowance for doubtful accounts are subject to significant change during
times of economic weakness or uncertainty in either the overall U.S. economy or the industries we serve. To proactively manage accounts receivable aging and collections and evaluate the adequacy of our allowance for doubtful accounts, we continue to
monitor the economic environment and its impact on our customers.

We recorded total provisions against earnings for doubtful
accounts of $2.9 million, $2.4 million and $3.5 million for the years ended December 31, 2010, 2009 and 2008, respectively. In 2010, there was no additional provision for doubtful accounts from anticipated legal settlements for customers in
bankruptcy and discontinued operations. In 2009 and 2008, we recognized additional provisions for customers in bankruptcy and discontinued operations of $0.3 million and $0.9 million, respectively.

Securities Available-for-Sale

Securities available-for-sale are recorded at fair value as long-term assets. Temporary unrealized holding gains and losses are recorded as a separate component of accumulated other comprehensive income
(loss), net of applicable income taxes. Unrealized losses are charged against earnings when a decline in fair value is determined to be other-than-temporary. An impairment is considered to be other-than-temporary if an entity intends to sell a
security, more likely than not will be required to sell a security before recovering its cost, or does not expect to recover a securitys entire amortized cost basis, even if there is no intent to sell the security.



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Our securities available for sale consist of auction-rate securities. Liquidity for auction
rate securities was originally intended to be provided by an auction process that would reset the applicable interest rate at pre-determined intervals, usually every 7, 28 or 35 days. Due to disruptions in the credit markets beginning in 2008, these
auctions have not had sufficient bidders to allow investors to complete a sale, indicating that immediate liquidity at par is unavailable. Given the uncertainty as to when the liquidity issues will improve, we have classified these securities as
long-term assets. Our auction rate securities represent interests in pools of student loans guaranteed by the U.S. government under the Federal Family Education Loan Program and a structured finance security. The structured finance security has an
attached credit default swap under which the principal value would be partially or fully forfeited at net default rates on the underlying corporate debt obligations ranging from 8% to 9% as of December 31, 2010. The actual net default rate as
of December 31, 2010 is 4.89%. Both the structured finance security and the credit default swap are collateralized by investment grade credit-linked notes made up of floating rate international bank notes or credit card receivable notes. During
the fourth quarter of 2010, we sold two of our three structured finance securities.

Due to the liquidity issues associated
with auction rate securities and the corresponding lack of activity in this market, there was insufficient observable market data to determine the fair value of our auction rate securities as of December 31, 2010. Therefore, their fair value
was estimated by an independent valuation firm, Houlihan Capital Advisors, LLC, using a probability weighted discounted cash flow model. The model incorporates assumptions that market participants would use in their estimates of fair value such as
reset interest rates, final stated maturities, collateral values, credit quality and insurance, and applies the probabilities of either (a) a successful auction; (b) a failed auction; or (c) a default; at each auction, which represent
Level 3 fair value inputs. This valuation is sensitive to market conditions and managements judgment and can change significantly based on the assumptions used. Factors that may impact the valuation include: changes to credit ratings of the
securities and, for the structured finance securities, changes to the credit ratings of the underlying assets supporting the securities as well as rates of default of the underlying assets, underlying collateral values, discount rates, counterparty
risk and ongoing strength and quality of market credit and liquidity.

We consider several factors in assessing whether a loss
is other-than-temporary. These factors include, but are not limited to: our intent and more likely than not, our ability to hold a security for a period of time sufficient to allow for recovery of its fair value; the length of time a security is in
an unrealized loss position; the extent to which fair value is less than cost; the financial condition and near term prospects of the issuer; changes to the credit ratings of securities, as well as their underlying assets; and, for our structured
finance security, rates of default on the underlying portfolio of credit default swaps.

In assessing the expectation of
recovering a securitys amortized cost basis, we perform an assessment of the present value of cash flows expected to be collected. If this assessment yields an amount less than the amortized cost basis of the security, even if we have the
intent, and more likely than not, the ability to hold the securities, a credit loss is deemed to exist. The amount of an other-than-temporary impairment attributed to the credit losses is recognized in earnings, while the amount of an
other-than-temporary impairment related to other factors is recognized in other comprehensive income, net of applicable income taxes. We estimate credit losses associated with our auction rate securities using Level 3 inputs. Credit loss estimates
are derived by comparing the estimated fair value of the securities, which are based on a number of factors, including estimated probabilities of default, with the value that would have been derived if the probability of default for the same
securities were zero percent. The difference between the recorded fair value and the estimated fair value assuming a zero probability of default is considered the portion of total decline in fair value attributable to credit losses.

We sold two of our three structured finance securities in the fourth quarter 2010 for $7.0 million. These securities had a par value of
$11.2 million and an adjusted cost basis of $6.6 million. Cumulative credit losses of $4.6 million, $4.0 million of which were recognized in 2009, and $0.6 million of which were recognized in 2010, were offset slightly by a realized gain of $0.4
million on the sale transaction, for a cumulative net realized loss of $4.2 million on disposal of these securities. Gross accumulated losses in other comprehensive income of $0.9 million and their related tax impact were eliminated.

Following the sale, we determined that we no longer met the criteria for intent to hold with respect to our remaining structured finance
auction rate security, which has a par value of $5.0 million and a cost basis of $2.3 million as of December 31, 2010. We recognized cumulative gross unrealized losses of $0.3 million, or $0.2 million, net of tax, associated with this security
in the fourth quarter of 2010. As of December 31, 2010, cumulative losses recognized in earnings for this security total $2.7 million. Future declines in fair value below cost will be charged to earnings, whereas future increases in fair value
will be recorded in other comprehensive income, net of applicable income taxes. As of December 31, 2010, $0.3 million of gross unrealized gains, or $0.2 million, net of tax, were recorded in other comprehensive income related to this security.



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We continue to have the intent and ability to hold our student loan auction rate securities
until maturity, or until their par value can be recovered. As of December 31, 2010, these securities have a par value and cost basis of $17.5 million and a fair value of $16.4 million. Gross accumulated losses of $1.1 million related to our
student loan auction rate securities have been recorded in other comprehensive income, net of applicable income taxes, as of December 31, 2010.

See Note 7 - Securities Available for Sale in the notes to the consolidated financial statements.

Goodwill and Intangible Assets

We perform our annual impairment review of goodwill and certain intangible assets with indefinite lives during the fourth quarter each year at the reporting unit level. Assets of acquired businesses and
related goodwill are allocated to the corresponding reporting units. We identify our reporting units by assessing whether the components holding purchased assets, including goodwill and related assumed liabilities, have discrete financial
information available. To the extent two or more components are deemed economically similar, those components are aggregated into a single reporting unit for purposes of our annual goodwill impairment review. Our reporting units are one level below
our reportable segment.

Our reporting units sell and provide contracting services, including building, installation,
maintenance and upgrade services by primarily digging and drilling trenches and installing poles, pipe, towers, antennae, wire, and equipment. Many of our reporting units perform these services across multiple industries, including
telecommunications, utilities and government, and on behalf of a variety of customers, some of which contract services from multiple reporting units.

We estimate the fair value of each reporting unit and compare the fair value to its carrying value, including goodwill. If the carrying value exceeds the estimated fair value, the value of the reporting
units goodwill or other indefinite-lived intangibles may be impaired and could require a write down. During the three year period ended December 31, 2010, we estimated the fair value of the our reporting units using a discounted cash flow
methodology, which incorporates five-year projection of revenues, operating costs and cash flows considering historical and anticipated future results, general economic and market conditions, as well as the impact of planned business and operational
strategies. We applied a discounted cash flow technique utilizing a terminal value equal to 5.5 times year five earnings before net interest expense, income taxes, depreciation and amortization (EBITDA). Discount rates ranged from 8.5%
to 10.7% per annum and represent our estimated cost of capital at the time of the analysis. A 100 basis point change in the discount rate would not have had a material impact on the results of the impairment analysis.

Based upon the analyses performed, no material impairment charges were recorded in the three years ended December 31, 2010. However,
significant changes in the estimates used in our analysis could result in an impairment charge related to goodwill and/or intangible assets. In addition, we could record impairment losses in the future if profitability and cash flows of our
reporting entities decline to the point where their carrying values exceeded their market values. See Item 1A. Risk Factors - Our reporting entity may incur goodwill impairment charges which could harm our profitability.

Insurance Reserves

We
presently maintain insurance policies subject to per claim deductibles of $1 million for our workers compensation policy, $2 million for our general liability policy and $2 million for our automobile liability policy. We have excess umbrella
coverage up to $100 million per claim and in the aggregate. We also maintain an insurance policy with respect to employee group health claims subject to annual per employee maximum losses of $0.4 million. We actuarially determine any liabilities for
unpaid claims and associated expenses, including incurred but not reported losses, and reflect the present value of those liabilities in our balance sheet as other current and non-current liabilities. The determination of such claims and expenses
and the appropriateness of the related liability is reviewed and updated quarterly. However, insurance liabilities are difficult to assess and estimate due to the many relevant factors, the effects of which are often unknown, including the severity
of an injury, the determination of our liability in proportion to other parties, the number of incidents not reported and the effectiveness of our safety program. We continue to work with our insurance carriers to resolve claims quickly in an effort
to reduce our exposure. We are also attempting to accelerate the claims process where possible so that amounts incurred can be reported rather than estimated. Known amounts for claims that are in the process of being settled, but have been paid in
periods subsequent to those being reported, are recorded in the subsequent reporting period. Our accruals are based upon known facts, historical trends and our reasonable estimate of future expenses and we believe such accruals to be adequate.
However, a change in experience or actuarial assumptions could nonetheless materially affect results of operations in a particular period.



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Income Taxes

We recorded income taxes using the asset and liability method of accounting for deferred income taxes. Under this method, deferred tax assets and liabilities are recognized for the expected future tax
consequence of temporary differences between the financial statement and income tax basis of our assets and liabilities. Income taxes are estimated in each of the jurisdictions in which we operate. This process involves estimating the tax exposure
together with assessing temporary differences resulting from differing treatment of items, such as deferred revenue, for tax and accounting purposes. These differences result in deferred tax assets and liabilities, which are included within the
consolidated balance sheet. The recording of a net deferred tax asset assumes the realization of such asset in the future. Otherwise, a valuation allowance must be recorded to reduce this asset to its net realizable value.

Tax valuation allowances are established to reduce tax assets, such as tax loss carryforwards, to net realizable value. We consider
future pretax income and ongoing prudent and feasible tax planning strategies in assessing the net realizable value of tax assets and the need for such a valuation allowance. In the event that we determine that we may not be able to realize all or
part of the net deferred tax asset in the future, a valuation allowance for the deferred tax asset is charged against income in the period such determination is made. As of December 31, 2010, we no longer have any net operating loss
carryforwards for federal income tax purposes. In prior years, we released the valuation allowance that was previously established against domestic net operating losses. Based on our recent history of profitability and our forecasts for future
periods, we determined that it is more likely than not that the state net operating loss carryforwards and other temporary differences will be realized. As of December 31, 2010 and 2009, we have valuation allowances aggregating $5.6 million and
$5.4 million, respectively. These valuation allowances relate to foreign net operating losses and credit carryforwards that we believe may not be realized in future periods.

Litigation and Contingencies

Litigation and contingencies are reflected in
our consolidated financial statements based on our assessments, along with legal counsel, of the expected outcome of litigation proceedings or the expected resolution of the contingency. An accrual is made when a loss is probable and estimable. If
the final outcome of a litigation proceeding or a contingency differs significantly from our current expectations, a charge to earnings could result. See Part I. Item 3. Legal Proceedings for discussion of current litigation
matters.

2011 Outlook

We believe we have significant market opportunities in 2011 in five areas:

Natural Gas Pipelines - we believe that demand for clean-burning, domestic natural gas will grow in future years in order
to reduce U.S. dependence on foreign energy sources. With recent developments in drilling and completion technologies for oil and gas, we expect new North American producing fields to be developed and old fields to be expanded significantly. We
anticipate the resulting incremental production will provide increasing opportunities for our gas gathering, gas compression, gas treatment, long-haul and mid-stream gas pipeline construction operations. We have made acquisitions in the last few
years to expand our capabilities in these areas.

Alternative and Renewable Energy Projects - we believe this
market will continue to grow in 2011 and we have made acquisitions to expand our capabilities in this area, where our primary focus is the construction of wind farms, solar farms and related infrastructure. The increasing regulatory mandates for
electricity generation from alternative and renewable sources and the ARRA, which calls for expansion of domestic renewable energy sources through tax incentives, cash grants and loan guarantees, should provide our renewable energy operations with
the potential for sustained growth.

Wireless and Fiber Communications Network Upgrades - we believe wireless
and fiber optic communication network upgrades will grow in 2011 and that the major regional and rural telecommunications and other communications companies will continue to expand and enhance their capabilities in these areas, which could increase
demand for our services. We have recently expanded our capabilities in wireless construction. Additionally, the ARRA allocates $7.2 billion for the development of broadband facilities throughout the U.S and the expansion of broadband access into
areas that are currently not served by high-speed data networks.



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Work for Electrical Grid Upgrades - we believe that the nations
electrical grid, which routinely encounters capacity and reliability issues, will be expanded, modernized and upgraded in the coming years. Also, renewable energy, which is often generated in remote areas, will require a significant investment in
new transmission and substation assets in order to deliver this power to population and industrial centers with high electrical power demand. The ARRA allocates $11 billion for modernization and expansion of the national electrical grid in order to
develop a smart grid. Additionally, we believe that cost and labor conditions are making it increasingly attractive for utilities to outsource their construction and maintenance activities.

Install to the Home - we believe the increased number of DIRECTV® subscribers and expansion of high definition video programming provide us with the continuing opportunity to provide
installation, upgrade and maintenance services for new and existing customers. Also, AT&T began a co-marketing agreement with DIRECTV® in February 2009 in which they bundle DIRECTV® services with their voice and data services in numerous markets exclusively serviced by us. Our expertise in home installation also provides opportunities to offer
similar, or unrelated, installation services for new customers.

Our 2011 results could be adversely affected by the matters
discussed in the Cautionary Statement Regarding Forward-looking Statements, Item 1A. Risk Factors and Item 3. Legal Proceedings of this Annual Report on Form 10-K.

Comparisons of Fiscal Year Results

The components of our consolidated statements of operations, expressed in dollars (in thousands) and as a percentage of revenue, are set forth in the following table. Our consolidated results of
operations are not necessarily comparable from period to period due to the impact of recent acquisitions. See the Notes to Consolidated Financial Statements, Note 4 - Acquisitions and Joint Ventures.



|                                                                                    |  |                         |         |   |      |  |       |      |  |   |         |   |  |  |       |   |  |   |         |   |  |  |       |  
|----------------------------------------------------------------------------------- |  | ----------------------- | ------- | - | ---- |  | ----- | ---- |  | - | ------- | - |  |  | ----- | - |  | - | ------- | - |  |  | ----- | -
|                                                                                    |  | Year Ended December 31, |        
|                                                                                    |  | 2010                    |         |   | 2009 |  |       | 2008 | 
|Revenue                                                                             |  | $                       | 2,308.0 |   |      |  | 100.0 | %    |  | $ | 1,623.5 |   |  |  | 100.0 | % |  | $ | 1,378.7 |   |  |  | 100.0 | %
|Costs of revenue, excluding depreciation and amortization                           |  |                         | 1,938.9 |   |      |  | 84.0  |      |  |   | 1,376.1 |   |  |  | 84.8  |   |  |   | 1,179.2 |   |  |  | 85.5  |  
|Depreciation and amortization                                                       |  |                         | 58.0    |   |      |  | 2.5   |      |  |   | 49.5    |   |  |  | 3.1   |   |  |   | 28.5    |   |  |  | 2.1   |  
|General and administrative expenses                                                 |  |                         | 126.7   |   |      |  | 5.5   |      |  |   | 96.9    |   |  |  | 6.0   |   |  |   | 89.7    |   |  |  | 6.5   |  
|Interest expense, net                                                               |  |                         | 29.1    |   |      |  | 1.3   |      |  |   | 24.7    |   |  |  | 1.5   |   |  |   | 14.7    |   |  |  | 1.1   |  
|Other expense (income), net                                                         |  |                         | 1.3     |   |      |  | 0.0   |      |  |   | (2.8    | ) |  |  | (0.3  | ) |  |   | (0.9    | ) |  |  | (0.1  | )
|                                                                                    |  |                         |         |   |      |  |       |      |  |   |         |   |  |  |       |   |  |   |         |   |  |  |       |  
|Income from continuing operations before income taxes and non-controlling interests |  | $                       | 154.0   |   |      |  | 6.7   | %    |  | $ | 79.1    |   |  |  | 4.9   | % |  | $ | 67.5    |   |  |  | 4.9   | %
|Provision for income taxes                                                          |  |                         | (63.6   | ) |      |  | (2.8  | )    |  |   | (8.4    | ) |  |  | (0.5  | ) |  |   | (0.9    | ) |  |  | (0.1  | )
|                                                                                    |  |                         |         |   |      |  |       |      |  |   |         |   |  |  |       |   |  |   |         |   |  |  |       |  
|Income from continuing operations beforenon-controlling interests                   |  | $                       | 90.4    |   |      |  | 3.9   | %    |  | $ | 70.7    |   |  |  | 4.4   | % |  | $ | 66.6    |   |  |  | 4.8   | %
|Loss from discontinued operations, net of tax                                       |  |                         |        |   |      |  |      |      |  |   |        |   |  |  |      |   |  |   | (0.8    | ) |  |  | (0.0  | )
|                                                                                    |  |                         |         |   |      |  |       |      |  |   |         |   |  |  |       |   |  |   |         |   |  |  |       |  
|Net income                                                                          |  | $                       | 90.4    |   |      |  | 3.9   | %    |  | $ | 70.7    |   |  |  | 4.4   | % |  | $ | 65.8    |   |  |  | 4.8   | %
|Net loss attributable to non-controlling interests                                  |  |                         | (0.1    | ) |      |  | (0.0  | )    |  |   |        |   |  |  |      |   |  |   |        |   |  |  |      |  
|                                                                                    |  |                         |         |   |      |  |       |      |  |   |         |   |  |  |       |   |  |   |         |   |  |  |       |  
|Net income attributable to MasTec                                                   |  | $                       | 90.5    |   |      |  | 3.9   | %    |  | $ | 70.7    |   |  |  | 4.4   | % |  | $ | 65.8    |   |  |  | 4.8   | %
|                                                                                    |  |                         |         |   |      |  |       |      |  |   |         |   |  |  |       |   |  |   |         |   |  |  |       |  

The following discussion and analysis of our results of operations should be read in conjunction with our
consolidated financial statements and notes thereto in Item 8 of this Form 10-K.

Comparison of Years Ended December 31, 2010 and
2009

Revenue.Our revenue was approximately $2.3 billion for the year ended
December 31, 2010, compared to $1.6 billion in 2009, representing an increase of approximately $685 million or 42.2%. Of the total increase, approximately $294.0 million resulted from acquisitions. The remaining increase of $390.5 million, or
24%, is attributable to organic growth, primarily from our wireless, renewables, pipeline and install to the home customers. Key customers driving growth in 2010 included AT&T, El Paso Corporation, DIRECTV®, Tenaska Energy, Edison Mission Energy and Talisman Energy. Our organic revenue growth was partially offset by the
impact of economic and competitive pressures, which have negatively impacted pricing and growth in certain components of our business. We actively monitor economic and industry trends and any related impact on our business.





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Costs of revenue.Our costs of revenue were approximately $1.9 billion, or
84.0% of revenue for the year ended 2010, compared to $1.4 billion, or 84.8% of revenue for the year ended 2009, a $562.8 million increase, or 40.9%. The dollar increase is attributable to higher costs associated with increased revenues, as
discussed above. As a percentage of revenue, costs of revenue decreased 80 basis points. This improvement is attributable to higher utilization of resources resulting from our revenue growth. Our margins have also been favorably impacted by business
mix, as well as from productivity gains, such as deployment of resources across multiple reporting units. As discussed above, certain components of our business have been negatively impacted by economic factors, which partially offset our margin
improvements.

Depreciation and amortization. Depreciation and amortization was $58.0 million in 2010, compared
to $49.5 million in 2009, representing an increase of $8.5 million or 17%. The increase was primarily driven by our prior year acquisition of Precision Pipeline LLC (Precision), which resulted in an incremental $11.1 million in
depreciation and $1.5 million in amortization, partially offset by a decrease of $2.9 million in depreciation on past investments in information technology and a decrease of $1.4 million in amortization expense from historical acquisitions.

General and administrative expenses. General and administrative expenses were $126.7 million, or 5.5% of
revenue in 2010, compared to $96.9 million, or 6.0% of revenue in 2009, representing an increase of $29.7 million, or 30.7%. The dollar increase resulted largely from higher labor and other costs in support of the growth in our business, as
discussed above. As a percentage of revenue, general and administrative expenses decreased 50 basis points. Our 2009 general and administrative expenses were partially offset by the receipt of a settlement award of approximately $2.0 million in
connection with the settlement of a legacy litigation matter. Excluding this settlement, general and administrative expenses were 6.1% of revenue in 2009, resulting in a net 60 basis points improvement in general and administrative expenses from
2009 to 2010. This improvement is attributable to improved utilization of investments in labor and technology made in anticipation of growth in the business.

Interest expense, net. Interest expense, net of interest income, was $29.1 million, or 1.3% of revenue in 2010, compared to $24.7 million, or 1.5% of revenue in 2009, representing an
increase of $4.4 million. This increase is primarily attributable to $215 million of senior convertible notes issued in 2009, partially offset by a reduction in interest expense from the repayment of our $55 million 8% convertible note in June 2009
and the October 2010 refinancing of $13.4 million of our 7.05% equipment note with a new equipment note, bearing interest at 3.5267%. Because we have higher average debt balances in 2010, our interest expense has increased versus the prior year.

Other expense (income), net.Other expense, net, was $1.3 million in 2010 compared to other income, net, of
$2.8 million in 2009. The reduction in other income of $4.1 million as compared with 2009 is partially attributable to credit and other losses, net, of $0.8 million recognized during 2010 on our auction rate securities, versus the impact in 2009 of
a $7.0 million settlement on litigation related to our auction rate securities, which was partially offset by $6.1 million of credit losses. Other expense was also impacted by a $0.9 million decrease in gains on sales of assets as compared with
2009. In addition, in 2010, we incurred $0.3 million in lease termination costs, $0.3 million of losses on equity method investments and $0.5 million of expense related to changes in the estimated fair value of acquisition-related contingent
consideration. See Note 4 - Acquisitions and Joint Ventures in the notes to the consolidated financial statements.

Income taxes.Income taxes were $63.6 million in 2010, compared with $8.4 million in 2009, representing an increase
of $55.2 million. This increase is primarily due to a higher effective tax rate. Our 2009 rate was significantly lower because we released valuation allowances that were established against certain deferred tax assets in prior years, including net
operating loss carryforwards. The release of these valuation allowances for the year ended 2009 reduced our total income tax expense, resulting in an effective tax rate of 10.6% as compared with an effective tax rate of 41.3% for year ended 2010.

Comparison of Years Ended December 31, 2009 and 2008

Revenue.Revenue was approximately $1.6 billion for the year ended December 31, 2009, compared to $1.4 billion in 2008, representing an increase of
approximately $245 million or 17.8%. Of the total increase, approximately $435 million resulted from acquisitions. This increase was partially offset by the negative impact on organic revenue of tightened capital expenditures by our customers and
slower developing business resulting from the slowdown in the U.S. economy. Revenues for the year ended December 31, 2009 do not reflect any impact of the federal and state stimulus initiatives as the marketplace was slow to generate
opportunities due to the slow pace of project funding. Key customers driving growth in 2009 included Enbridge, AT&T, Duke Energy, Iberdrola Renewables, Great River Energy and NextEra Energy.



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Costs of revenue. Costs of revenue were approximately $1.4 billion, or 84.8%
of revenue in 2009, compared to $1.2 billion, or 85.5% of revenue in 2008. The dollar increase is driven by our revenue growth as discussed above. As a percentage of revenue, costs of revenue in 2009 decreased 70 basis points. The decrease reflects
productivity gains in a number of operating expense categories as well as decreased fuel and material costs, partially offset by higher labor costs as a percentage of revenues.

Depreciation and amortization.Depreciation and amortization was $49.5 million in 2009, compared to
$28.5 million in 2008, representing an increase of $21 million or 74.0%. The increase was due to acquisitions, which resulted in the addition of $9.1 million in depreciation and $10.3 million in amortization in 2009 as compared to 2008.

General and administrative expenses. General and administrative expenses were $96.9 million, or 6.0% of revenue in
2009, compared to $89.7 million, or 6.5% of revenue in 2008, representing an increase of $7.2 million but a decrease as a percentage of revenue of 50 basis points. The increase in total general and administrative expenses was primarily due to
increased labor and information technology costs to support new business activities, partially offset by our receipt of a settlement award in the fourth quarter of 2009 in connection with the settlement of a legacy litigation matter. Excluding the
settlement, general and administrative expenses were 6.1% of revenue in 2009, a 40 basis point improvement, resulting from scale and productivity gains as well as lower executive compensation expense due to the compensation settlement for our former
CEO in 2008.

Interest expense, net.Interest expense, net of interest income was $24.7 million, or 1.5% of
revenue in 2009, compared to $14.7 million, or 1.1% of revenue in 2008, representing an increase of approximately $10.0 million. This increase resulted from interest expense in the first half of 2009 on the $55 million 8% convertible notes and on
the revolving credit facility in connection with the Wanzek Construction, Inc. (Wanzek) acquisition, as well as interest expense in 2009 on the senior convertible notes that were issued in June and November 2009. Interest expense, net,
also increased as a result of reduced interest income due to lower interest rates on invested cash.

Other income,
net.Other income, net was $2.8 million in 2009, compared to $0.9 million in 2008, representing an increase of approximately $1.9 million. The increase resulted from higher gains on the sale of property and equipment, as
well as a $7.0 million settlement on litigation related to our auction rate securities, partially offset by a $6.1 million credit loss resulting from an other-than-temporary impairment on our corporate debt obligation auction rate securities.

Income taxes. Income taxes were $8.4 million in 2009, compared to $0.9 million in 2008, representing an
increase of $7.5 million. This increase is primarily due to an increase in the effective tax rate from 1.3% in 2008 to 10.6% in 2009. The increase in the rate was attributable to having fully released the valuation allowance related to certain
deferred tax assets prior to the fourth quarter of 2009, which increased our full year tax rate in 2009 as compared with 2008.

Earnings
Before Interest Expense, Taxes, Depreciation and Amortization (EBITDA)

EBITDA is a non-GAAP financial measure
that reflects earnings excluding the impact of interest expense (net of interest income), provision for income taxes, depreciation and amortization. Management considers EBITDA to be an indicator of operating performance because we use it to measure
our ability to service debt, fund capital expenditures and expand our business. We also use EBITDA, as we believe analysts, lenders, investors and others do, to evaluate our performance because it excludes certain items that can vary widely across
different industries or among companies within the same industry. For example, interest expense can be dependent on a companys capital structure, debt levels and credit ratings. Accordingly, the impact of interest expense on earnings can vary
significantly among companies. The tax positions of companies can also vary because of their differing abilities to take advantage of tax benefits and because of the tax policies of the jurisdictions in which they operate. As a result, effective tax
rates and provision for income taxes can vary considerably among companies and over time. For example, our effective tax rate and corresponding income tax provision have increased significantly from 2008 to 2010. The release of our valuation
allowances in 2008 and 2009 significantly reduced our effective tax rates and resulting income tax expense in those years. We believe our tax rate in 2010 is reflective of the tax rate that we would anticipate in the future. See the table below for
a summary of our effective tax rates from 2008 through 2010. EBITDA also excludes depreciation and amortization because companies utilize productive assets of different ages and use different methods of both acquiring and depreciating productive
assets. These differences can result in considerable variability in the relative costs of productive assets and the depreciation and amortization expense among companies.



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EBITDA should not be considered in isolation from, and is not intended to represent an
alternative measure of, operating results or net income as determined in accordance with U.S. GAAP. EBITDA is also not defined the same way in our indentures, and should therefore not be used for purposes of determining our compliance with related
covenants.

The following table reflects a reconciliation of our EBITDA in dollar and percentage of revenue terms for the
periods indicated (dollar amounts in millions). Our consolidated results of operations are not necessarily comparable from period to period due to the impact of recent acquisitions. The table below may contain slight summation differences due to
rounding.



|                                                               |  |                                  |       |  |      |  |      |      |  |   |       |  |  |  |     |   |  |   |       |  |  |  |     |  
|-------------------------------------------------------------- |  | -------------------------------- | ----- |  | ---- |  | ---- | ---- |  | - | ----- |  |  |  | --- | - |  | - | ----- |  |  |  | --- | -
|                                                               |  | For the Years Ended December 31, |      
|                                                               |  | 2010                             |       |  | 2009 |  |      | 2008 | 
|EBITDA Reconciliation                                          |  |                                  |       |  |      |  |      |      |  |   |       |  |  |  |     |   |  |   |       |  |  |  |     |  
|                                                               |  |                                  |       |  |      | 
|Net income                                                     |  | $                                | 90.4  |  |      |  | 3.9  | %    |  | $ | 70.7  |  |  |  | 4.4 | % |  | $ | 65.8  |  |  |  | 4.8 | %
|Loss from discontinued operations                              |  |                                  |      |  |      |  |     |      |  |   |      |  |  |  |    |   |  |   | 0.8   |  |  |  | 0.0 | %
|Interest expense, net of interest income                       |  |                                  | 29.1  |  |      |  | 1.3  | %    |  |   | 24.7  |  |  |  | 1.5 | % |  |   | 14.7  |  |  |  | 1.1 | %
|Provision for income taxes                                     |  |                                  | 63.6  |  |      |  | 2.8  | %    |  |   | 8.4   |  |  |  | 0.5 | % |  |   | 0.9   |  |  |  | 0.1 | %
|Depreciation and amortization                                  |  |                                  | 58.0  |  |      |  | 2.5  | %    |  |   | 49.5  |  |  |  | 3.1 | % |  |   | 28.5  |  |  |  | 2.1 | %
|                                                               |  |                                  |       |  |      |  |      |      |  |   |       |  |  |  |     |   |  |   |       |  |  |  |     |  
|Earnings before interest, taxes, depreciation and amortization |  | $                                | 241.1 |  |      |  | 10.4 | %    |  | $ | 153.4 |  |  |  | 9.4 | % |  | $ | 110.7 |  |  |  | 8.0 | %
|                                                               |  |                                  |       |  |      |  |      |      |  |   |       |  |  |  |     |   |  |   |       |  |  |  |     |  

The table below summarizes our effective tax rates for the years ended December 31, 2010, 2009 and
2008:



|                   |  |                                  |      |   |      |  |      |      |  |  |     |  
|------------------ |  | -------------------------------- | ---- | - | ---- |  | ---- | ---- |  |  | --- | -
|                   |  | For the Years Ended December 31, |     
|                   |  | 2010                             |      |   | 2009 |  |      | 2008 | 
|Effective tax rate |  |                                  | 41.3 | % |      |  | 10.6 | %    |  |  | 1.3 | %

Financial Condition, Liquidity and
Capital Resources

Our primary sources of liquidity are cash flows from continuing operations, availability under our
credit facility and our cash balances. Our primary liquidity needs are for working capital, capital expenditures, insurance collateral in the form of cash and letters of credit, earn-out obligations and debt service. We also evaluate opportunities
for strategic acquisitions and/or investments from time to time that may require cash, and may consider opportunities to either repurchase outstanding debt or repurchase outstanding shares of our common stock in the future.

Capital Expenditures. We estimate that we will spend approximately $40 million in 2011 on capital expenditures. The
increase versus prior year capital expenditures is due to higher expected business activity levels in 2011 as compared with 2010. The nature of our business is equipment intensive and actual capital expenditures can increase or decrease from
estimates depending upon business activity levels. We will continue to evaluate lease versus buy decisions to meet our equipment needs and based on this evaluation, our capital expenditures may increase or decrease in the future. We also expect to
continue to sell older equipment as we upgrade to new equipment.

Earn-out Payments. We
have made certain acquisitions and have agreed to pay earn-out payments to certain of the sellers, generally based on the future performance of the acquired businesses. Certain of these earn-out payments may be made in either cash or, under certain
circumstances, MasTec common stock, or a combination thereof, at our option. During the years ended December 31, 2010, 2009 and 2008, we made cash payments of $80.6 million, $20.6 million and $11.4 million, respectively, related to earn-out
obligations. Of the $80.6 million paid in 2010, $40 million relates to a one time payment in connection with the Nsoro acquisition. In December 2010, we amended the Nsoro purchase agreement and paid the seller of Nsoro a one time payment of $40
million and issued 1.875 million shares of MasTec common stock, which were valued at $27 million. The amendment effectively reduces potential future earn-out payments in exchange for upfront consideration. See Note 4 - Acquisitions and Joint
Ventures in the notes to the consolidated financial statements for additional details.

Income Taxes. Our cash
tax payments increased from $2.1 million in 2009 to $5.7 million in 2010. We expect our cash tax payments to increase in the future as we have fully utilized our federal net operating loss carryforwards as of December 31, 2010.



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Working Capital. We need working capital to support seasonal variations in our
business, primarily due to the impact of weather conditions on external construction and maintenance work and the spending patterns of our customers, both of which influence the timing of associated spending to support related customer demand. Our
business is typically slower in the first quarter of each calendar year and, we generally experience seasonal working capital needs from approximately April through October to support growth in unbilled revenue and accounts receivable, and to a
lesser extent, inventory. Our inventory balances have grown in 2010, from approximately $32 million as of December 31, 2009 to $57 million as of December 31, 2010, primarily to support growth from our wireless customers. Our billing terms
are generally net 30 days, and some of our contracts allow our customers to retain a portion (from 2% to 15%) of the contract amount until the job is completed. For certain customers, we maintain inventory to meet the material requirements of the
contracts. Occasionally, certain of our customers pay us in advance for a portion of the materials we purchase for their projects, or allow us to pre-bill them for materials purchases up to specified amounts. Vendor terms are generally 30 days. Our
agreements with subcontractors often contain a pay-when-paid provision, whereby our payments to subcontractors are made only after we are paid by our customers.

Summary of Financial Condition, Liquidity and Capital Resources

The
general weak economic conditions and slow pace of recovery have not had a significant impact on our overall financial position, results of operations or cash flows for the year ended December 31, 2010, although certain components of our
business have been negatively impacted as discussed in our Results of Operations - Comparisons of Fiscal Year Results. Given the generally good credit quality of our customer base, we do not expect collections issues to materially impact our
liquidity in the next twelve months. In addition, as a result of our current capital structure, including our credit facility, we do not anticipate that current overall market and economic conditions will materially impact our liquidity. We
anticipate that funds generated from our operations, borrowings under our credit facility and our cash balances will be sufficient to meet our working capital requirements, anticipated capital expenditures, insurance collateral requirements,
earn-out obligations, letters of credit and debt service obligations for at least the next twelve months.

Sources and
Uses of Cash

As of December 31, 2010, we had $235.1 million in working capital, defined as current assets less
current liabilities, compared to $202.5 million as of December 31, 2009. Cash and cash equivalents, including approximately $18.0 million and $18.2 million of restricted cash at December 31, 2010 and 2009, respectively, increased from
$88.5 million at December 31, 2009 to $177.6 million at December 31, 2010. Restricted cash related to collateral for certain letters of credit is invested in certificates of deposit with a maturity of 90 days.

Sources and uses of cash are summarized below (in millions):



|                                                    |  |                                  |        |   |      |   |        |      |  |   |        |  
|--------------------------------------------------- |  | -------------------------------- | ------ | - | ---- | - | ------ | ---- |  | - | ------ | -
|                                                    |  | For the Years Ended December 31, |       
|                                                    |  | 2010                             |        |   | 2009 |   |        | 2008 | 
|Net cash provided by operating activities           |  | $                                | 218.0  |   |      | $ | 124.1  |      |  | $ | 58.2   |  
|Net cash used in investing activities               |  | $                                | (104.3 | ) |      | $ | (176.0 | )    |  | $ | (142.0 | )
|Net cash (used in) provided by financing activities |  | $                                | (24.7  | ) |      | $ | 93.3   |      |  | $ | 57.0   |  

Operating
activities. Cash flow from operations is primarily influenced by demand for our services, operating margins and the type of services we provide, but can also be influenced by working capital needs such as the timing of collection of
receivables and the settlement of payables and other obligations. Working capital needs are generally higher from April through October due to the seasonality of our business. Conversely, a portion of working capital assets are typically converted
to cash in the first and fourth quarters. Net cash provided by operating activities increased by $93.9 million to $218.0 million for the year ended December 31, 2010. This increase was primarily driven by an increase in net income adjusted for
non-cash items, such as depreciation and amortization, as well as increases in billings in excess of costs and earnings, accounts payable, accrued expenses and accrued taxes payable. These increases were partially offset by increases in accounts
receivable balances. The increases in billings in excess of costs and earnings, accounts payable and accrued expenses were driven by our revenue growth. The increase in accrued taxes payable is related to our having fully utilized our federal net
operating loss carryforwards as of December 31, 2010. As a result, our cash tax payments will increase in the future.





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Investing activities. Net cash used in investing activities decreased by $71.7
million to $104.3 million for the year ended December 31, 2010 as compared with 2009. The decrease was driven by a decrease in cash used for acquisitions and investments, including payments of earn-out obligations, as well as the receipt in
2010 of $7.0 million from the sale of a portion of our auction rate securities investment. An increase in capital expenditures, including vehicles and equipment, to support growth in our business partially offset the decrease in cash used in
investing activities described above.

Financing activities.Net cash used in financing activities increased by
$118.0 million to $24.7 million for the year ended December 31, 2010 as compared with net cash provided by financing activities of $93.3 million for the year ended December 31, 2009. The change was driven primarily by a reduction in net
proceeds from borrowings. In June 2009, we issued $115 million of 4.0% senior convertible notes, the proceeds of which were used to repay the $55 million convertible notes and approximately $20 million of outstanding borrowings on our credit
facility. In November 2009, the Company issued $100 million of 4.25% senior convertible notes, the proceeds of which were used to fund the acquisition of Precision and for general corporate purposes.

Auction Rate Securities

As of December 31, 2010, we held $22.5 million in par value of auction rate securities, with an estimated fair value and carrying value of $19.0 million. Cumulative unrealized losses, net of
unrealized gains, totaled $0.8 million as of December 31, 2010, which are recorded in other comprehensive income, net of applicable income taxes. In the fourth quarter 2010, we sold two of our three structured finance securities for $7.0
million. These securities had a par value of $11.2 million and an adjusted cost basis of $6.6 million. Cumulative credit losses of $4.6 million, $4.0 million of which were recognized in 2009, and $0.6 million of which were recognized in 2010, were
offset slightly by a realized gain of $0.4 million on the sale transaction, for a cumulative net realized loss of $4.2 million on disposal of these securities. Gross accumulated losses in other comprehensive income of $0.9 million and their related
tax impact were eliminated.

Following the sale, we determined that we no longer met the criteria for intent to hold with
respect to our remaining structured finance auction rate security, which has a par value of $5.0 million and a cost basis of $2.3 million as of December 31, 2010. As a result, we recognized cumulative gross unrealized losses of $0.3 million, or
$0.2 million, net of tax, associated with this security in the fourth quarter of 2010. Cumulative losses recognized in earnings as of December 31, 2010 total $2.7 million. Future declines in fair value below cost will be charged to earnings,
whereas future increases in fair value will be recorded in other comprehensive income, net of applicable income taxes. As of December 31, 2010, $0.3 million of gross unrealized gains, or $0.2 million, net of tax, were recorded in other
comprehensive income related to this security.

We continue to have intent and ability to hold our student loan auction rate
securities until maturity, or until their par value can be recovered. As of December 31, 2010, these securities have a par value and cost basis of $17.5 million. Gross accumulated losses of $1.1 million have been recorded in other comprehensive
income, net of applicable income taxes. We anticipate holding these securities until we can realize their cost basis and believe our existing cash resources will be sufficient to meet our anticipated needs for working capital and capital
expenditures to execute our current business plan.

See Note 7 - Securities Available for Sale and Note 16 - Commitments and
Contingencies in the notes to the consolidated financial statements for additional details.

Credit Facility

We have a senior secured credit facility, which we refer to as our Credit Facility. Our Credit Facility has a maximum
amount of available borrowing capacity of $210 million, subject to certain restrictions, and expires in May 2013. The maximum available borrowing capacity may be increased to $260 million, provided that we are in compliance with all provisions and
covenants of the Credit Facility and that such additional borrowing would not violate the indenture that governs our senior notes. We may consider increasing our borrowing capacity to $260 million as provided under the Credit Facility, and/or
further expanding our borrowing capacity to accommodate future business growth. Because our existing lenders, however, are not obligated to provide additional capacity, our ability to secure additional financing cannot be assured.

Interest on outstanding balances on the Credit Facility accrues at variable rates based, at our option, on the agent banks base
rate (as defined in the Credit Facility) plus a margin of between 1.25% and 1.75%, or at LIBOR plus a margin of between 2.25% and 3.00%, depending on certain financial thresholds. At December 31, 2010, the margin over LIBOR was 2.25% and the
margin over the base rate was 1.25%. In addition, the Credit Facility includes an unused facility fee ranging from 0.5% to 0.75% based on usage. At December 31, 2010, the unused facility fee was 0.75%.



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The amount we can borrow under our Credit Facility at any given time is based upon a formula
that takes into account, among other things, eligible billed and unbilled accounts receivable, equipment, real estate and eligible cash collateral, which can result in borrowing availability of less than the full amount of the Credit Facility. At
December 31, 2010 and 2009, net availability under the Credit Facility totaled $124.2 million and $89.8 million, respectively, net of outstanding standby letters of credit aggregating $85.8 million and $79.8 million at December 31, 2010
and 2009, respectively. These letters of credit mature at various dates and most have automatic renewal provisions subject to prior notice of cancellation. The Credit Facility is collateralized by a first priority security interest in substantially
all of our assets and the assets of our wholly-owned subsidiaries and a pledge of the stock of certain of our operating subsidiaries. At December 31, 2010, we did not have an outstanding balance on the Credit Facility for borrowed money.

In November 2010, we entered into an amendment to our Credit Facility in connection with a debt exchange offer relating to
$115 million of our outstanding 4.0% senior convertible notes and $100 million of our outstanding 4.25% senior convertible notes. Under the amendment, the lenders consented to the exchange offer and to the issuance of new 4.0% senior convertible and
new 4.25% senior convertible notes, subject to, among other things, the condition that, prior to the expiration of the Credit Facility in May 2013, we may not use any borrowings under the Credit Facility, or more than $10 million in the aggregate
from cash on hand to defease, redeem or settle conversions of the new notes without prior consent of the lenders under the Credit Facility. See Note 21 - Subsequent Events in the notes to the consolidated financial statements for additional
information.

Our Credit Facility contains customary events of default (including cross-default) provisions and covenants
related to our operations that prohibit, among other things, making investments and acquisitions in excess of specified amounts, incurring additional indebtedness in excess of specified amounts, creating liens against our assets, prepaying
subordinated indebtedness and engaging in certain mergers or combinations without the prior written consent of the lenders. The Credit Facility also limits our ability to make certain distributions or pay dividends. In addition, we are required to
maintain a minimum fixed charge coverage ratio of 1.2 to 1.0, which is calculated as available cash flow divided by debt carrying costs, as defined in the Credit Facility. Any deterioration in the quality of billed and unbilled receivables,
reduction in the value of our equipment or an increase in our lease expense related to real estate would reduce availability under the Credit Facility. At December 31, 2010, we were in compliance with all provisions and covenants of the Credit
Facility.

Based upon current availability under our Credit Facility, liquidity and cash flow projections, we believe we will
be in compliance with the Credit Facilitys terms and conditions and the minimum availability requirements for the next twelve months. We are dependent upon borrowings and letters of credit under this Credit Facility to fund operations. Should
we be unable to comply with the terms and conditions of the Credit Facility, we would be required to obtain modifications to the Credit Facility or another source of financing to continue to operate. We may also not be able to achieve our
projections; however, we do not expect this to adversely affect our ability to remain in compliance with the Credit Facilitys minimum net availability requirements and minimum fixed charge coverage ratio for at least the next twelve months.

Senior Convertible Notes

In November 2009, we issued $100 million of 4.25% senior convertible notes due December 15, 2014 in a private placement. The senior convertible notes bear interest at a rate of 4.25% per year,
payable semi-annually in arrears, on June 15 and December 15 of each year, commencing on June 15, 2010. On or prior to December 12, 2014, holders may convert their notes into shares of our common stock at an initial conversion
rate of 64.6162 shares of our common stock per $1,000 principal amount of notes, which represents an initial conversion price of approximately $15.48 per share, subject to customary anti-dilution adjustment terms for these types of notes.
Approximately $3.7 million in financing costs were incurred in connection with the issuance of these notes. These deferred financing costs are included in other assets in the consolidated balance sheet and are being amortized over the term of the
notes. The proceeds from the 4.25% senior convertible notes were used to fund the acquisition of Precision and for general corporate purposes.

In June 2009, we issued $115 million of 4% senior convertible notes due June 15, 2014 in a registered offering. The senior convertible notes bear interest at a rate of 4% per year, payable
semi-annually in arrears, on June 15 and December 15 of each year, commencing on December 15, 2009. On or prior to June 13, 2014, holders may convert their notes into shares of our common stock at an initial conversion rate of
63.4417 shares of our common stock per $1,000 principal amount of notes, which represents an initial conversion price of approximately $15.76 per share, subject to customary anti-dilution adjustment terms for these types of notes. Approximately $5.4
million in financing costs were incurred in connection with the issuance of these notes, which are included in other assets in the consolidated balance sheet and are being amortized over the term of the notes. The proceeds from the 4% senior
convertible notes were used to repay the $55 million 8% convertible note issued in connection with the Wanzek acquisition, convertible at $12.00 per share, as well as the outstanding balance on the Credit Facility of approximately $20 million in
June 2009. The remaining net proceeds were used for working capital, the acquisition of Precision and general corporate purposes.



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The 4.25% and 4.0% senior convertible notes are guaranteed by substantially all of our
operating subsidiaries. There are no financial covenants on these notes, however, there are certain nonfinancial provisions and covenants associated with these notes. At December 31, 2010, we were in compliance with all such provisions and
covenants.

In January 2011, we completed a debt exchange offer related to our outstanding 4.0% senior convertible notes and
our outstanding 4.25% senior convertible notes (together, the Original Notes). For an exchange fee of 50 basis points, or 0.5% of the aggregate exchanged principal amount of our Original Notes, we exchanged the Original Notes tendered
for a like principal amount of new 4.0% or 4.25% senior convertible notes, as applicable (together, the New Notes), that are substantially similar in all material respects, except that the New Notes have an optional physical, cash, or
combination, settlement feature and contain certain conditional conversion features. Upon completion of the exchange offer, $100.6 million of the original 4% senior convertible notes and $97.0 million of the 4.25% senior convertible notes, or 87.5%
and 97%, respectively, were canceled and exchanged for an identical principal amount of New Notes, plus exchange fees of approximately $1.0 million, which will be treated as a component of interest expense and recognized over the remaining life of
the New Notes. Approximately $0.5 million of transaction costs were recognized in connection with the exchange transaction within selling, general and administrative expense in the consolidated income statement for the year ended December 31,
2010. Following the exchange offer, $14.4 million and $3.0 million of the original 4.0% and 4.25% notes, respectively, remain outstanding. See Note 21 - Subsequent Events in the notes to the consolidated financial statements for additional details.

Senior Notes

As of December 31, 2010, we had $150 million of outstanding 7.625% senior notes due February 2017, with interest due semi-annually. The notes contain default (including cross-default) provisions
and covenants restricting many of the same transactions as under our Credit Facility. The indenture that governs our 7.625% senior notes allows us to incur additional indebtedness to the extent that our fixed charge coverage ratio, as therein
defined, is at least 2:1. The fixed charge coverage ratio is calculated as consolidated EBITDA for the most recent four fiscal quarters for which internal financial statements are available, divided by fixed charges for such four quarter period, as
such terms are defined in the indenture. If the fixed charge coverage ratio is less than 2:1, we are still permitted to incur the following additional indebtedness, among others: credit facilities under a defined threshold, renewals to existing debt
permitted under the indenture, capital lease obligations up to 5% of our consolidated net assets, plus an additional $50 million of indebtedness at any time the senior notes remain outstanding. The senior notes are guaranteed by substantially all of
our operating subsidiaries. At December 31, we were in compliance with all the provisions and covenants of the 7.625% senior notes.

Convertible Notes

As described in Note 4 - Acquisitions and Joint
Ventures in the notes to the consolidated financial statements, in connection with our acquisition of Wanzek, we issued an 8% convertible note in the principal amount of $55 million due December 2013 with interest payments payable in April, August,
and December of each year, commencing in April 2009 and convertible at the holders election at a conversion price of $12 per share. The 8% convertible note was repaid in June 2009 with the proceeds of our 4% senior convertible notes.

Acquisition Debt

Pumpco

In connection with the acquisition of Pumpco, we entered into an
equipment term loan in the aggregate amount of $22.5 million at 7.05% interest, payable in 60 monthly installments, maturing in 2013. The proceeds from this equipment term loan were used to pay off $8.7 million of Pumpco indebtedness, with the
remaining balance funding a portion of the acquisition purchase price. In October 2010, we repaid the $13.4 million outstanding principal balance of the 7.05% equipment term loan with the proceeds of a new loan in the amount of $13.5 million,
bearing interest at 3.5267%. The 3.5267% equipment term loan is payable in 36 monthly installments, maturing in 2013 and is secured by most of Pumpcos existing equipment and is guaranteed by MasTec. We also assumed approximately $9.5 million
in notes payable for equipment and capital lease obligations in connection with the acquisition of Pumpco.



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Wanzek

In connection with the acquisition of Wanzek, we issued the note described under Convertible Notes above and also assumed approximately $15 million of Wanzeks debt.

Precision

We assumed approximately $34 million in notes payable for equipment and capital lease obligations in connection with the acquisition of
Precision.

Except for one note with an immaterial principal balance at December 31, 2010, there are no financial
covenants associated with the acquisition debt described above.

Debt Guarantees

The subsidiary guarantees related to our senior convertible notes and senior notes are full and unconditional and joint and several, and
there are generally no contractual restrictions on our ability to obtain funds from our subsidiaries. Also, MasTec, Inc. is a holding company with no independent assets or operations, and our subsidiaries that do not guarantee the senior convertible
notes and senior notes are minor, individually, and in the aggregate, as such term is defined under the rules and regulations of the SEC. Accordingly, condensed consolidating financial information for MasTec, Inc. and its subsidiaries is not
presented.

Contractual Payment Obligations

The following table sets forth our contractual payment obligations as of December 31, 2010 during the periods indicated below (in
millions):



|                             |  |       |       |  |                  |   |       |            |  |   |            |  |  |                                |       |  |  |   |       | 
|---------------------------- |  | ----- | ----- |  | ---------------- | - | ----- | ---------- |  | - | ---------- |  |  | ------------------------------ | ----- |  |  | - | ----- | 
|Contractual Obligations      |  | Total |       |  | Less than1 
Year |   |       | 1 - 3Years |  |   | 3 - 5Years |  |  | More than5 Years andThereafter |      
|Senior notes                 |  | $     | 150.0 |  |                  | $ |      |            |  | $ |           |  |  | $                              |      |  |  | $ | 150.0 | 
|Senior convertible notes (1) |  |       | 215.0 |  |                  |   |      |            |  |   |           |  |  |                                | 215.0 |  |  |   |      | 
|Equipment term loan          |  |       | 12.9  |  |                  |   | 4.4   |            |  |   | 8.5        |  |  |                                |      |  |  |   |      | 
|Notes payable for equipment  |  |       | 10.2  |  |                  |   | 5.2   |            |  |   | 4.3        |  |  |                                | 0.7   |  |  |   |      | 
|Earn-out obligations (2)     |  |       | 35.6  |  |                  |   | 35.6  |            |  |   |           |  |  |                                |      |  |  |   |      | 
|Capital leases               |  |       | 24.5  |  |                  |   | 8.8   |            |  |   | 11.3       |  |  |                                | 4.4   |  |  |   |      | 
|Operating leases             |  |       | 106.9 |  |                  |   | 31.0  |            |  |   | 49.0       |  |  |                                | 20.0  |  |  |   | 6.9   | 
|Interest (3)                 |  |       | 118.7 |  |                  |   | 22.1  |            |  |   | 42.2       |  |  |                                | 29.6  |  |  |   | 24.8  | 
|                             |  |       |       |  |                  |   |       |            |  |   |            |  |  |                                |       |  |  |   |       | 
|Total                        |  | $     | 673.8 |  |                  | $ | 107.1 |            |  | $ | 115.3      |  |  | $                              | 269.7 |  |  | $ | 181.7 | 
|                             |  |       |       |  |                  |   |       |            |  |   |            |  |  |                                |       |  |  |   |       | 



|(1) | Amount is comprised of $115 million of 4.0% senior convertible notes due in 2014 and $100 million of 4.25% senior convertible notes due in 2014. See Note 10-Debt in the notes to the consolidated financial statements and Senior Convertible Notes above.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(2) | Under certain acquisition agreements, we have agreed to pay the sellers earn-outs based on the performance of the businesses acquired. Certain of these earn-out
payments may be made in either cash or, under certain circumstances, MasTec common stock, or a combination thereof, at our option. Due to the contingent nature of these earn-out payments, we have only included earn-out obligations that we assume
will be paid in cash, are quantifiable and have been earned as of December 31, 2010.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(3) | Interest represents interest payments due on all debt and capital lease obligations. All of our debt, with the exception of our line of credit, for which we had no
outstanding balance at December 31, 2010, are fixed interest rate obligations.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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Off-balance sheet arrangements

As is common in our industry, we have entered into certain off-balance sheet arrangements in the ordinary course of business that result
in risks not directly reflected in our balance sheets. Our significant off-balance sheet transactions include liabilities associated with non-cancelable operating leases, letter of credit obligations, and performance and payment bonds entered into
in the normal course of business. We have not engaged in any off-balance sheet financing arrangements through special purpose entities.

Leases. We enter into non-cancelable operating leases for certain of our facility, vehicle and equipment needs. These leases allow us to conserve cash by paying a monthly lease rental
fee for use of facilities, vehicles and equipment rather than purchasing them. We may decide to cancel or terminate a lease before the end of its term, in which case we are typically liable to the lessor for the remaining lease payments under the
term of the lease.

Letters of Credit.In the ordinary course of business, we are required to post
letters of credit for our insurance carriers and surety bond providers. Such letters of credit are generally issued by a bank or similar financial institution. The letter of credit commits the issuer to pay specified amounts to the holder of the
letter of credit if the holder claims that we have failed to perform specified actions. If this were to occur, we would be required to reimburse the issuer of the letter of credit. Depending on the circumstances of such a reimbursement, we may also
have to record a charge to earnings for the reimbursement. We do not believe it is likely that any material claims will be made under a letter of credit in the foreseeable future. As of December 31, 2010, we had $85.8 million of standby letters
of credit issued under our Credit Facility, of which $59.5 million were related to our insurance programs. We may be required to post additional letters of credit or other collateral in favor of our insurance carriers, surety bond providers or
customers in the future. Posting letters of credit would reduce the borrowing availability under our Credit Facility.

Performance and Payment Bonds. In the ordinary course of business, we are required by certain customers to post
performance and payment bonds in connection with services we provide to them. These bonds provide a guarantee to the customer that we will perform under the terms of a contract and that we will pay subcontractors and vendors. If we fail to perform
under a contract or to pay subcontractors and vendors, the customer may demand that the surety make payments or provide services under the bond. We must reimburse the surety for any expenses or outlays it incurs. In August 2010, we increased our
performance bonding capacity to accommodate growth in our businesses with bonding requirements. If our business continues to grow, our bonding requirements may increase in the future. If we are unable to successfully renew or obtain sufficient
bonding capacity in the future, it could limit our ability to bid on certain contracts or perform work for certain customers.

As of December 31, 2010, estimated costs to complete projects secured by our $520.0 million of performance and payment bonds was
$93.9 million. We believe it is unlikely that we will have to fund significant claims under performance and payment bonds in the foreseeable future.

Collective Bargaining Agreements.Certain of our subsidiaries are party to various collective bargaining agreements with unions representing certain of their employees. The agreements
require the subsidiaries party to the agreements to pay specified wages, provide certain benefits to their union employees and contribute certain amounts to multi-employer pension plans and employee benefit trusts. The multi-employer pension plan
contribution rates are determined annually and assessed on a pay-as-you-go basis based on union employee payrolls, which cannot be determined for future periods because the number of union employees employed at any given time and the
plans in which they may participate vary depending upon the location and number of ongoing projects and the need for union resources in connection with those projects. The collective bargaining agreements expire at various times and have typically
been renegotiated and renewed on terms similar to the ones contained in the expiring agreements.

The Employee Retirement
Income Security Act of 1974, as amended by the Multi-Employer Pension Plan Amendments Act of 1980, imposes certain liabilities upon employers who are contributors to a multi-employer plan in the event of the employers withdrawal from, or upon
termination of, such plan. In the event of a complete or partial withdrawal from any of these plans, or if the plans were to otherwise become underfunded, the subsidiaries (and potentially MasTec) could be assessed liabilities for the withdrawal or
for additional contributions related to the underfunding of these plans. None of the subsidiaries party to the agreements have any current plans to withdraw from the plans. The Pension Protection Act of 2006 also added new funding rules generally
applicable to plan years beginning after 2007 for multi-employer plans that are classified as endangered, seriously endangered, or critical status. For a plan in critical status, additional required contributions
and benefit reductions may apply. We have been notified that certain plans to which our subsidiaries contribute are in critical status and require additional contributions in the form of a surcharge on future benefit contributions
required for future work performed by union employees covered by these plans. The amount of additional funds we may be obligated to contribute in the future cannot be estimated, as such amounts will be based on future levels of work that require the
specific use of those union employees covered by these plans.



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Other Guarantees. In the ordinary course of business, from time to time, we
guarantee the obligations of our subsidiaries, including obligations under certain contracts with customers, certain lease obligations, and in some states, obligations in connection with obtaining contractors licenses. We also generally
warrant the work we perform for a one- to two year-period following substantial completion of a project. We have not historically accrued any reserves for potential warranty claims as they have been immaterial. We also generally indemnify our
customers for the services we provide under our contracts, as well as other specified liabilities, which may subject us to indemnity claims, liabilities and related litigation. As of December 31, 2010, we are not aware of any asserted claims
for material amounts in connection with these indemnity obligations.

Seasonality

Some of our customers tend to reduce their expenditures and work order requests towards the end of the year. Adverse weather conditions,
particularly during the winter season, also affect our ability to perform outdoor services in certain regions of the United States. As a result, we experience reduced revenue in the first quarter of each calendar year. We expect this pattern to be
more dramatic in the future as a greater proportion of our projects are in northern climates due to our recent acquisitions.

Impact of
Inflation

The primary inflationary factors affecting our operations are labor and fuel costs, and to a lesser extent,
material costs. Although we did experience increases in these costs in 2010 as compared with 2009, the increases in labor and material costs were primarily due to revenue growth and changes in business mix. Fuel costs also increased versus 2009 due,
in part, to higher prices as well as to revenue growth and business mix. The price of fuel is subject to unexpected fluctuations due to events outside of our control, including geopolitical events and fluctuations in global supply and demand.
Significant fuel price increases could adversely impact our operating results in the future. We closely monitor inflationary factors and any impact they may have on our operating results or financial condition.

Recently Issued Accounting Pronouncements

See Note 2 - Summary of Significant Accounting Policies in the notes to the consolidated financial statements.



|ITEM 7A. | QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
|-------- | ----------------------------------------------------------

Interest Rate Risk

None of our outstanding debt at December 31, 2010
was subject to variable interest rates as we had no outstanding draws on our Credit Facility as of December 31, 2010. Interest under the Credit Facility accrues interest at variable rates based, at our option, on the agent banks base rate
(as defined in the Credit Facility) plus a margin of between 1.25% and 1.75%, or at the LIBOR rate plus a margin of between 2.25% and 3.00%, depending on certain financial thresholds. At December 31, 2010, the margin over LIBOR was 2.25% and
the margin over the base rate was 1.25%.

Our fixed interest rate debt primarily includes $150 million in 7.625% senior notes,
$115 million in 4.0% senior convertible notes, $100 million in 4.25% senior convertible notes and a $13.5 million 3.5267% equipment term loan.

Foreign Currency Risk

We have limited operations in certain foreign countries, primarily Latin America and the Caribbean. Due to the limited nature of our
foreign operations, fluctuations in foreign currency exchange rates have not had a material impact on our financial statements. Our exposure to fluctuations in foreign currency exchange rates could increase in the future if our foreign revenues
increase, or if we expand our operations outside of the United States.



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Auction Rate Securities

Our securities available for sale consist of auction rate securities. Our auction rate securities represent interests in pools of student loans guaranteed by the U.S. government under the Federal Family
Education Loan Program and a structured finance security. The structured finance security has an attached credit default swap under which the principal value would be partially or fully forfeited at net default rates on the underlying corporate debt
obligations ranging from 8% to 9% as of December 31, 2010. The actual net default rate as of December 31, 2010 is 4.89%. Both the structured finance security and the credit default swap are collateralized by investment grade credit-linked
notes made up of floating rate international bank notes or credit card receivable notes.

We sold two of our three structured
finance securities for $7.0 million in the fourth quarter 2010. These securities had a par value of $11.2 million and an adjusted cost basis of $6.6 million. As of December 31, 2010, we hold $22.5 million in par value of auction rate
securities, with an estimated fair value and carrying value of $19.0 million. Cumulative unrealized losses, net of gains, total $0.8 million as of December 31, 2010, which are recorded in other comprehensive income, net of applicable income
taxes. To date, we have recognized $6.9 million of losses, net of realized gains of $0.4 million, on our auction rate securities. Of the cumulative losses of $6.9 million, $4.2 million relates to securities disposed of in 2010, and $2.7 million
relates to securities we hold as of December 31, 2010.

See Note 7 - Securities Available for Sale in the notes to
consolidated financial statements.



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|ITEM 8. | FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA
|------- | -------------------------------------------

Index to Consolidated Financial Statements



|                                                                                                                 |  |      |    | 
|---------------------------------------------------------------------------------------------------------------- |  | ---- | -- | 
|                                                                                                                 |  | Page |   
|Report of Independent Registered Public Accounting Firm                                                          |  |      | 55 | 
|                                                                                                                 | 
|Consolidated Statements of Operations for the Years Ended December 31, 2010, 2009 and
2008                       |  |      | 56 | 
|                                                                                                                 | 
|Consolidated Balance Sheets as of December 31, 2010 and 2009                                                     |  |      | 57 | 
|                                                                                                                 | 
|Consolidated Statements of Changes in Shareholders Equity for the Years Ended December 
31, 2010, 2009 and 2008 |  |      | 58 | 
|                                                                                                                 | 
|Consolidated Statements of Cash Flows for the Years Ended December 31, 2010, 2009 and
2008                       |  |      | 59 | 
|                                                                                                                 | 
|Notes to Consolidated Financial Statements                                                                       |  |      | 60 | 



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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and

Shareholders of MasTec, Inc.

We have audited
the accompanying consolidated balance sheets of MasTec, Inc. and subsidiaries as of December 31, 2010 and 2009 and the related consolidated statements of operations, changes in shareholders equity, and cash flows for the three years then
ended. In connection with our audits of the consolidated financial statements, we have also audited the schedule listed in Item 15(a)2. These financial statements and the schedule are the responsibility of the Companys management. Our
responsibility is to express an opinion on these financial statements and schedule based on our audits.

We conducted our audits in accordance
with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements and schedule are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as
well as evaluating the overall presentation of the financial statements and schedule. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in all material respects, the consolidated financial position of MasTec, Inc. as of December 31, 2010 and 2009, and the
consolidated results of their operations and their cash flows for the three years then ended in conformity with accounting principles generally accepted in the United States of America.

The Company adopted FASB 141(R), Business Combinations, codified in ASC 805, Business Combinations, effective January 1, 2009.

Also, in our opinion, the financial statements schedules, when considered in relation to the basic consolidated financial statements takes as a whole, presents fairly, in all material respects, the
information set forth therein.

We also have audited, in accordance with the Standards of the Public Company Accounting Oversight Board
(United States), the effectiveness of MasTec, Inc.s internal control over financial reporting as of December 31, 2010, based on criteria established in Internal Control - Integrated Framework issued by the Committee of Sponsoring
Organizations of the Treadway Commission (COSO) and our report dated February 23, 2011 expressed an unqualified opinion thereon.



|                            
|----------------------------
|/s/ BDO USA, LLP            
|Certified Public Accountants
|                            
|Miami, Florida              
|                            
|February 23, 2011           



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MASTEC, INC.

CONSOLIDATED STATEMENTS OF OPERATIONS

(In thousands, except shares and per share amounts)



|                                                                                                                |  |      |           |   |      |   |           |      |  |   |           |  
|--------------------------------------------------------------------------------------------------------------- |  | ---- | --------- | - | ---- | - | --------- | ---- |  | - | --------- | -
|                                                                                                                |  | 2010 |           |   | 2009 |   |           | 2008 | 
|Revenue                                                                                                         |  | $    | 2,308,031 |   |      | $ | 1,623,502 |      |  | $ | 1,378,663 |  
|Costs of revenue, excluding depreciation and amortization                                                       |  |      | 1,938,882 |   |      |   | 1,376,125 |      |  |   | 1,179,190 |  
|Depreciation and amortization                                                                                   |  |      | 57,966    |   |      |   | 49,539    |      |  |   | 28,465    |  
|General and administrative expenses                                                                             |  |      | 126,658   |   |      |   | 96,932    |      |  |   | 89,705    |  
|Interest expense, net                                                                                           |  |      | 29,105    |   |      |   | 24,690    |      |  |   | 14,758    |  
|Other expense (income), net                                                                                     |  |      | 1,420     |   |      |   | (2,917    | )    |  |   | (927      | )
|                                                                                                                |  |      |           |   |      |   |           |      |  |   |           |  
|Income from continuing operations before provision for income taxes andnon-controlling interests                |  | $    | 154,000   |   |      | $ | 79,133    |      |  | $ | 67,472    |  
|Provision for income taxes                                                                                      |  |      | (63,613   | ) |      |   | (8,385    | )    |  |   | (870      | )
|                                                                                                                |  |      |           |   |      |   |           |      |  |   |           |  
|Income from continuing operations before non-controlling interests                                              |  | $    | 90,387    |   |      | $ | 70,748    |      |  | $ | 66,602    |  
|Loss from discontinued operations, net of tax                                                                   |  |      |          |   |      |   |          |      |  |   | (814      | )
|                                                                                                                |  |      |           |   |      |   |           |      |  |   |           |  
|Net income                                                                                                      |  | $    | 90,387    |   |      | $ | 70,748    |      |  | $ | 65,788    |  
|Net loss attributable to non-controlling interests                                                              |  |      | (141      | ) |      |   |          |      |  |   |          |  
|                                                                                                                |  |      |           |   |      |   |           |      |  |   |           |  
|Net income attributable to MasTec                                                                               |  | $    | 90,528    |   |      | $ | 70,748    |      |  | $ | 65,788    |  
|                                                                                                                |  |      |           |   |      |   |           |      |  |   |           |  
|                                                                                                                |  |      |          
|Earnings per share - basic and diluted (See Note 3 - Earnings Per Share)                                        |  |      |           |   |      |   |           |      |  |   |           |  
|Basic net income (loss) per share attributable to MasTec:                                                       |  |      |           |   |      |   |           |      |  |   |           |  
|Continuing operations                                                                                           |  | $    | 1.19      |   |      | $ | 0.93      |      |  | $ | 0.98      |  
|Discontinued operations                                                                                         |  |      |          |   |      |   |          |      |  |   | (0.01     | )
|                                                                                                                |  |      |           |   |      |   |           |      |  |   |           |  
|Total basic net income per share attributable to MasTec                                                         |  | $    | 1.19      |   |      | $ | 0.93      |      |  | $ | 0.97      |  
|                                                                                                                |  |      |           |   |      |   |           |      |  |   |           |  
|                                                                                                                |  |      |          
|Basic weighted average common shares outstanding                                                                |  |      | 76,132    |   |      |   | 75,701    |      |  |   | 67,983    |  
|                                                                                                                |  |      |           |   |      |   |           |      |  |   |           |  
|                                                                                                                |  |      |          
|Diluted net income (loss) per share attributable to MasTec:                                                     |  |      |           |   |      |   |           |      |  |   |           |  
|Continuing operations                                                                                           |  | $    | 1.05      |   |      | $ | 0.90      |      |  | $ | 0.97      |  
|Discontinued operations                                                                                         |  |      |          |   |      |   |          |      |  |   | (0.01     | )
|                                                                                                                |  |      |           |   |      |   |           |      |  |   |           |  
|Total diluted net income per share attributable to MasTec                                                       |  | $    | 1.05      |   |      | $ | 0.90      |      |  | $ | 0.96      |  
|                                                                                                                |  |      |           |   |      |   |           |      |  |   |           |  
|                                                                                                                |  |      |          
|Diluted weighted average common shares outstanding                                                              |  |      | 90,913    |   |      |   | 81,762    |      |  |   | 68,916    |  
|                                                                                                                |  |      |           |   |      |   |           |      |  |   |           |  
|                                                                                                                |  |      |          
|Supplemental disclosure (See Note 7 - Securities Available for Sale)                                            |  |      |           |   |      |   |           |      |  |   |           |  
|Other expense (income), net:                                                                                    |  |      |           |   |      |   |           |      |  |   |           |  
|Total other-than-temporary impairment (gains) losses on securities available for sale, net                      |  | $    | (233      | ) |      | $ | 8,149     |      |  | $ |          |  
|Less: Unrealized (gains) losses on securities available for sale, recognized in other comprehensive income, net |  |      | (1,397    | ) |      |   | 2,030     |      |  |   |          |  
|                                                                                                                |  |      |           |   |      |   |           |      |  |   |           |  
|Unrealized losses on securities available for sale, recognized in earnings                                      |  | $    | 1,164     |   |      | $ | 6,119     |      |  | $ |          |  
|Other expense (income), net                                                                                     |  |      | 256       |   |      |   | (9,036    | )    |  |   | (927      | )
|                                                                                                                |  |      |           |   |      |   |           |      |  |   |           |  
|Total other expense (income), net                                                                               |  | $    | 1,420     |   |      | $ | (2,917    | )    |  | $ | (927      | )
|                                                                                                                |  |      |           |   |      |   |           |      |  |   |           |  

The accompanying notes are an integral part of these consolidated financial statements.



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MASTEC, INC.

CONSOLIDATED BALANCE SHEETS

(In thousands, except shares and per share amounts)



|                                                                                                                                                                     |  |                  |           |   |                  |   |           |  
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ---------------- | --------- | - | ---------------- | - | --------- | -
|                                                                                                                                                                     |  | December 31,2010 |           |   | December 31,2009 |  
|Assets                                                                                                                                                               |  |                  |           |   |                  |   |           |  
|Current assets:                                                                                                                                                      |  |                  |           |   |                  |   |           |  
|Cash and cash equivalents, including restricted cash of $18,000 at December 31, 2010 and $18,208 at December 31, 2009,
respectively                                  |  | $                | 177,604   |   |                  | $ | 88,521    |  
|Accounts receivable, costs and earnings in excess of billings and retainage, net of allowance                                                                        |  |                  | 444,363   |   |                  |   | 323,008   |  
|Inventories                                                                                                                                                          |  |                  | 57,483    |   |                  |   | 31,770    |  
|Deferred tax assets, net                                                                                                                                             |  |                  | 11,990    |   |                  |   | 56,006    |  
|Prepaid expenses and deposits                                                                                                                                        |  |                  | 17,176    |   |                  |   | 14,221    |  
|Other current assets                                                                                                                                                 |  |                  | 13,058    |   |                  |   | 16,631    |  
|                                                                                                                                                                     |  |                  |           |   |                  |   |           |  
|Total current assets                                                                                                                                                 |  | $                | 721,674   |   |                  | $ | 530,157   |  
|                                                                                                                                                                     |  |                 
|Property and equipment, net                                                                                                                                          |  |                  | 180,786   |   |                  |   | 198,812   |  
|Goodwill                                                                                                                                                             |  |                  | 613,369   |   |                  |   | 504,200   |  
|Other intangible assets, net                                                                                                                                         |  |                  | 78,190    |   |                  |   | 91,217    |  
|Securities available for sale                                                                                                                                        |  |                  | 18,997    |   |                  |   | 24,511    |  
|Other assets                                                                                                                                                         |  |                  | 42,812    |   |                  |   | 33,291    |  
|                                                                                                                                                                     |  |                  |           |   |                  |   |           |  
|Total assets                                                                                                                                                         |  | $                | 1,655,828 |   |                  | $ | 1,382,188 |  
|                                                                                                                                                                     |  |                  |           |   |                  |   |           |  
|                                                                                                                                                                     |  |                 
|Liabilities and Shareholders Equity                                                                                                                                 |  |                  |           |   |                  |   |           |  
|Current liabilities:                                                                                                                                                 |  |                  |           |   |                  |   |           |  
|Current maturities of long-term debt                                                                                                                                 |  | $                | 18,399    |   |                  | $ | 28,473    |  
|Accounts payable                                                                                                                                                     |  |                  | 196,363   |   |                  |   | 152,559   |  
|Accrued salaries and wages                                                                                                                                           |  |                  | 33,079    |   |                  |   | 25,715    |  
|Accrued taxes payable                                                                                                                                                |  |                  | 15,269    |   |                  |   | 1,066     |  
|Accrued insurance                                                                                                                                                    |  |                  | 16,616    |   |                  |   | 10,034    |  
|Other accrued expenses                                                                                                                                               |  |                  | 13,329    |   |                  |   | 12,023    |  
|Acquisition-related contingent consideration, current portion                                                                                                        |  |                  | 35,639    |   |                  |   | 25,137    |  
|Billings in excess of costs and earnings                                                                                                                             |  |                  | 136,070   |   |                  |   | 49,869    |  
|Other current liabilities                                                                                                                                            |  |                  | 21,780    |   |                  |   | 22,759    |  
|                                                                                                                                                                     |  |                  |           |   |                  |   |           |  
|Total current liabilities                                                                                                                                            |  | $                | 486,544   |   |                  | $ | 327,635   |  
|                                                                                                                                                                     |  |                 
|Acquisition-related contingent consideration                                                                                                                         |  |                  | 34,695    |   |                  |   | 44,461    |  
|Other liabilities                                                                                                                                                    |  |                  | 24,789    |   |                  |   | 22,732    |  
|Deferred tax liabilities, net                                                                                                                                        |  |                  | 62,487    |   |                  |   | 49,275    |  
|Long-term debt                                                                                                                                                       |  |                  | 394,151   |   |                  |   | 409,923   |  
|                                                                                                                                                                     |  |                  |           |   |                  |   |           |  
|Total liabilities                                                                                                                                                    |  | $                | 1,002,666 |   |                  | $ | 854,026   |  
|                                                                                                                                                                     |  |                  |           |   |                  |   |           |  
|                                                                                                                                                                     |  |                 
|Commitments and contingencies (See Note 16)                                                                                                                          |  |                  |           |   |                  |   |           |  
|Shareholders equity:                                                                                                                                                |  |                  |           |   |                  |   |           |  
|Preferred stock, $1.00 par value; authorized shares - 5,000,000; issued and outstandingshares - none                                                                 |  | $                |          |   |                  | $ |          |  
|Common stock, $0.10 par value; authorized shares - 145,000,000; issued and outstandingshares - 78,215,189 and 75,954,004 at
December 31, 2010 and 2009, respectively |  |                  | 7,822     |   |                  |   | 7,596     |  
|Capital surplus                                                                                                                                                      |  |                  | 663,927   |   |                  |   | 629,730   |  
|Accumulated deficit                                                                                                                                                  |  |                  | (12,512   | ) |                  |   | (103,040  | )
|Accumulated other comprehensive loss                                                                                                                                 |  |                  | (6,156    | ) |                  |   | (6,124    | )
|                                                                                                                                                                     |  |                  |           |   |                  |   |           |  
|Total MasTec shareholders equity                                                                                                                                    |  | $                | 653,081   |   |                  | $ | 528,162   |  
|                                                                                                                                                                     |  |                  |           |   |                  |   |           |  
|                                                                                                                                                                     |  |                 
|Non-controlling interests                                                                                                                                            |  |                  | 81        |   |                  |   |          |  
|                                                                                                                                                                     |  |                  |           |   |                  |   |           |  
|Total shareholders equity                                                                                                                                           |  | $                | 653,162   |   |                  | $ | 528,162   |  
|                                                                                                                                                                     |  |                  |           |   |                  |   |           |  
|Total liabilities and shareholders equity                                                                                                                           |  | $                | 1,655,828 |   |                  | $ | 1,382,188 |  
|                                                                                                                                                                     |  |                  |           |   |                  |   |           |  

The accompanying notes are an integral part of these consolidated financial statements.



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MASTEC, INC.

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS EQUITY

(In thousands)



|                                                                                                                  |  |                     |        |   |                                            |  |        |        |  |   |                |  |  |                    |         |  |                                             |   |          |                                  |  |   |                          |   |  |                          |         |   |  |   |      |   |  |   |         |  
|----------------------------------------------------------------------------------------------------------------- |  | ------------------- | ------ | - | ------------------------------------------ |  | ------ | ------ |  | - | -------------- |  |  | ------------------ | ------- |  | ------------------------------------------- | - | -------- | -------------------------------- |  | - | ------------------------ | - |  | ------------------------ | ------- | - |  | - | ---- | - |  | - | ------- | -
|                                                                                                                  |  |                     |        |   | Common Stock and AdditionalPaid-In Capital |  |        |        |  |   |                |  |  |                    |         |  |                                             |   |          |                                  | 
|                                                                                                                  |  | ComprehensiveIncome |        |   | Shares                                     |  |        | Amount |  |   | CapitalSurplus |  |  | AccumulatedDeficit |         |  | AccumulatedOtherComprehensiveIncome
 (Loss) |   |          | Total 
MasTecShareholdersEquity |  |   | Non-ControllingInterests |   |  | TotalShareholdersEquity |        
|Balance December 31, 2007                                                                                         |  |                     |        |   |                                            |  | 67,174 |        |  | $ | 6,717          |  |  | $                  | 552,491 |  |                                             | $ | (239,576 | )                                |  | $ | (5,067                   | ) |  | $                        | 314,565 |   |  | $ |     |   |  | $ | 314,565 |  
|                                                                                                                  |  |                     |        |   |                                            |  |        |        |  |   |                |  |  |                    |         |  |                                             |   |          |                                  |  |   |                          |   |  |                          |         |   |  |   |      |   |  |   |         |  
|                                                                                                                  |  |                     |        |   |                                            |  |        |        | 
|Net income                                                                                                        |  | $                   | 65,788 |   |                                            |  |       |        |  | $ |               |  |  | $                  |        |  |                                             | $ | 65,788   |                                  |  | $ |                         |   |  | $                        | 65,788  |   |  | $ |     |   |  | $ | 65,788  |  
|Foreign currency translation adjustment                                                                           |  |                     | (67    | ) |                                            |  |       |        |  |   |               |  |  |                    |        |  |                                             |   |         |                                  |  |   | (67                      | ) |  |                          | (67     | ) |  |   |     |   |  |   | (67     | )
|Unrealized losses on securities available for sale, net of tax                                                    |  |                     | (8,278 | ) |                                            |  |       |        |  |   |               |  |  |                    |        |  |                                             |   |         |                                  |  |   | (8,278                   | ) |  |                          | (8,278  | ) |  |   |     |   |  |   | (8,278  | )
|Non cash stock compensation                                                                                       |  |                     |       |   |                                            |  |       |        |  |   |               |  |  |                    | 3,816   |  |                                             |   |         |                                  |  |   |                         |   |  |                          | 3,816   |   |  |   |     |   |  |   | 3,816   |  
|Issuance of common stock for acquisition                                                                          |  |                     |       |   |                                            |  | 7,500  |        |  |   | 750            |  |  |                    | 58,500  |  |                                             |   |         |                                  |  |   |                         |   |  |                          | 59,250  |   |  |   |     |   |  |   | 59,250  |  
|Stock issued, primarily for stock options exercised                                                               |  |                     |       |   |                                            |  | 781    |        |  |   | 78             |  |  |                    | 7,938   |  |                                             |   |         |                                  |  |   |                         |   |  |                          | 8,016   |   |  |   |     |   |  |   | 8,016   |  
|                                                                                                                  |  |                     |        |   |                                            |  |        |        |  |   |                |  |  |                    |         |  |                                             |   |          |                                  |  |   |                          |   |  |                          |         |   |  |   |      |   |  |   |         |  
|Balance December 31, 2008                                                                                         |  | $                   | 57,443 |   |                                            |  | 75,455 |        |  | $ | 7,545          |  |  | $                  | 622,745 |  |                                             | $ | (173,788 | )                                |  | $ | (13,412                  | ) |  | $                        | 443,090 |   |  | $ |     |   |  | $ | 443,090 |  
|                                                                                                                  |  |                     |        |   |                                            |  |        |        |  |   |                |  |  |                    |         |  |                                             |   |          |                                  |  |   |                          |   |  |                          |         |   |  |   |      |   |  |   |         |  
|                                                                                                                  |  |                     |        |   |                                            |  |        |        | 
|Net income                                                                                                        |  | $                   | 70,748 |   |                                            |  |       |        |  | $ |               |  |  | $                  |        |  |                                             | $ | 70,748   |                                  |  | $ |                         |   |  | $                        | 70,748  |   |  | $ |     |   |  | $ | 70,748  |  
|Foreign currency translation adjustment                                                                           |  |                     | (134   | ) |                                            |  |       |        |  |   |               |  |  |                    |        |  |                                             |   |         |                                  |  |   | (134                     | ) |  |                          | (134    | ) |  |   |     |   |  |   | (134    | )
|Unrealized gains on securities available for sale, net of tax                                                     |  |                     | 3,641  |   |                                            |  |       |        |  |   |               |  |  |                    |        |  |                                             |   |         |                                  |  |   | 3,641                    |   |  |                          | 3,641   |   |  |   |     |   |  |   | 3,641   |  
|Reclassification adjustment for impairment loss on securities available for sale included in earnings, net of tax |  |                     | 3,781  |   |                                            |  |       |        |  |   |               |  |  |                    |        |  |                                             |   |         |                                  |  |   | 3,781                    |   |  |                          | 3,781   |   |  |   |     |   |  |   | 3,781   |  
|Non cash stock compensation                                                                                       |  |                     |       |   |                                            |  |       |        |  |   |               |  |  |                    | 3,065   |  |                                             |   |         |                                  |  |   |                         |   |  |                          | 3,065   |   |  |   |     |   |  |   | 3,065   |  
|Stock issued, primarily for stock options exercised                                                               |  |                     |       |   |                                            |  | 499    |        |  |   | 51             |  |  |                    | 3,920   |  |                                             |   |         |                                  |  |   |                         |   |  |                          | 3,971   |   |  |   |     |   |  |   | 3,971   |  
|                                                                                                                  |  |                     |        |   |                                            |  |        |        |  |   |                |  |  |                    |         |  |                                             |   |          |                                  |  |   |                          |   |  |                          |         |   |  |   |      |   |  |   |         |  
|Balance December 31, 2009                                                                                         |  | $                   | 78,036 |   |                                            |  | 75,954 |        |  | $ | 7,596          |  |  | $                  | 629,730 |  |                                             | $ | (103,040 | )                                |  | $ | (6,124                   | ) |  | $                        | 528,162 |   |  | $ |     |   |  | $ | 528,162 |  
|                                                                                                                  |  |                     |        |   |                                            |  |        |        |  |   |                |  |  |                    |         |  |                                             |   |          |                                  |  |   |                          |   |  |                          |         |   |  |   |      |   |  |   |         |  
|                                                                                                                  |  |                     |        |   |                                            |  |        |        | 
|Net income                                                                                                        |  | $                   | 90,528 |   |                                            |  |       |        |  | $ |               |  |  | $                  |        |  |                                             | $ | 90,528   |                                  |  | $ |                         |   |  | $                        | 90,528  |   |  | $ | (141 | ) |  | $ | 90,387  |  
|Foreign currency translation adjustment                                                                           |  |                     | 75     |   |                                            |  |       |        |  |   |               |  |  |                    |        |  |                                             |   |         |                                  |  |   | 75                       |   |  |                          | 75      |   |  |   |     |   |  |   | 75      |  
|Unrealized losses, net, on securities available for sale, net of tax                                              |  |                     | (1,399 | ) |                                            |  |       |        |  |   |               |  |  |                    |        |  |                                             |   |         |                                  |  |   | (1,399                   | ) |  |                          | (1,399  | ) |  |   |     |   |  |   | (1,399  | )
|Reclassification adjustment for impairment loss on securities available for sale included in earnings, net of tax |  |                     | 714    |   |                                            |  |       |        |  |   |               |  |  |                    |        |  |                                             |   |         |                                  |  |   | 714                      |   |  |                          | 714     |   |  |   |     |   |  |   | 714     |  
|Reclassification adjustment for unrealized loss on sale of securities, net of tax                                 |  |                     | 578    |   |                                            |  |       |        |  |   |               |  |  |                    |        |  |                                             |   |         |                                  |  |   | 578                      |   |  |                          | 578     |   |  |   |     |   |  |   | 578     |  
|Acquisition of non-controlling interest                                                                           |  |                     |       |   |                                            |  |       |        |  |   |               |  |  |                    |        |  |                                             |   |         |                                  |  |   |                         |   |  |                          |        |   |  |   | 222  |   |  |   | 222     |  
|Non cash stock compensation                                                                                       |  |                     |       |   |                                            |  |       |        |  |   |               |  |  |                    | 3,444   |  |                                             |   |         |                                  |  |   |                         |   |  |                          | 3,444   |   |  |   |     |   |  |   | 3,444   |  
|Issuance of common stock in connection with acquisition related earn-out                                          |  |                     |       |   |                                            |  | 1,875  |        |  |   | 188            |  |  |                    | 26,857  |  |                                             |   |         |                                  |  |   |                         |   |  |                          | 27,045  |   |  |   |     |   |  |   | 27,045  |  
|Stock issued, primarily for stock options exercised                                                               |  |                     |       |   |                                            |  | 386    |        |  |   | 38             |  |  |                    | 3,896   |  |                                             |   |         |                                  |  |   |                         |   |  |                          | 3,934   |   |  |   |     |   |  |   | 3,934   |  
|                                                                                                                  |  |                     |        |   |                                            |  |        |        |  |   |                |  |  |                    |         |  |                                             |   |          |                                  |  |   |                          |   |  |                          |         |   |  |   |      |   |  |   |         |  
|Balance December 31, 2010                                                                                         |  | $                   | 90,496 |   |                                            |  | 78,215 |        |  | $ | 7,822          |  |  | $                  | 663,927 |  |                                             | $ | (12,512  | )                                |  | $ | (6,156                   | ) |  | $                        | 653,081 |   |  | $ | 81   |   |  | $ | 653,162 |  
|                                                                                                                  |  |                     |        |   |                                            |  |        |        |  |   |                |  |  |                    |         |  |                                             |   |          |                                  |  |   |                          |   |  |                          |         |   |  |   |      |   |  |   |         |  

The accompanying notes are an integral part of these consolidated financial statements.



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MASTEC, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)



|                                                                                       |  |                         |          |   |      |   |          |      |  |   |          |  
|-------------------------------------------------------------------------------------- |  | ----------------------- | -------- | - | ---- | - | -------- | ---- |  | - | -------- | -
|                                                                                       |  | Year Ended December 31, |         
|                                                                                       |  | 2010                    |          |   | 2009 |   |          | 2008 | 
|Cash flows from operating activities:                                                  |  |                         |          |   |      |   |          |      |  |   |          |  
|Net income                                                                             |  | $                       | 90,387   |   |      | $ | 70,748   |      |  | $ | 65,788   |  
|Adjustments to reconcile net income to net cash provided by operating activities:      |  |                         |          |   |      |   |          |      |  |   |          |  
|Depreciation and amortization                                                          |  |                         | 57,966   |   |      |   | 49,539   |      |  |   | 28,465   |  
|Stock-based compensation expense                                                       |  |                         | 3,872    |   |      |   | 3,065    |      |  |   | 3,816    |  
|Amortization of deferred financing costs                                               |  |                         | 3,252    |   |      |   | 2,098    |      |  |   | 696      |  
|Provision for doubtful accounts                                                        |  |                         | 2,895    |   |      |   | 2,414    |      |  |   | 3,482    |  
|Provision for losses on construction projects, net                                     |  |                         | 434      |   |      |   | 1,301    |      |  |   | 711      |  
|Provision for inventory obsolescence                                                   |  |                         | 300      |   |      |   | 302      |      |  |   | 99       |  
|Credit losses on securities available for sale                                         |  |                         | 1,164    |   |      |   | 6,119    |      |  |   |         |  
|Loss on equity method investments                                                      |  |                         | 321      |   |      |   |         |      |  |   |         |  
|Gain on disposal of assets                                                             |  |                         | (907     | ) |      |   | (1,334   | )    |  |   | (673     | )
|Changes in assets and liabilities, net of assets acquired and liabilities assumed:     |  |                         |          |   |      |   |          |      |  |   |          |  
|Accounts receivable, costs and earnings in excess of billings and retainage            |  |                         | (127,724 | ) |      |   | 85,044   |      |  |   | (13,797  | )
|Inventories                                                                            |  |                         | (25,363  | ) |      |   | 956      |      |  |   | (8,859   | )
|Deferred tax assets and liabilities, net                                               |  |                         | 56,360   |   |      |   | 8,577    |      |  |   | 3,486    |  
|Other assets, current and non-current portion                                          |  |                         | (5,614   | ) |      |   | 12,878   |      |  |   | 8,035    |  
|Accounts payable and accrued expenses                                                  |  |                         | 67,137   |   |      |   | (26,547  | )    |  |   | (8,348   | )
|Other liabilities, current and non-current portion                                     |  |                         | 93,549   |   |      |   | (91,021  | )    |  |   | (24,719  | )
|                                                                                       |  |                         |          |   |      |   |          |      |  |   |          |  
|Net cash provided by operating activities                                              |  | $                       | 218,029  |   |      | $ | 124,139  |      |  | $ | 58,182   |  
|                                                                                       |  |                         |          |   |      |   |          |      |  |   |          |  
|                                                                                       |  |                         |         
|Cash flows used in investing activities:                                               |  |                         |          |   |      |   |          |      |  |   |          |  
|Cash paid for acquisitions, net, including contingent consideration                    |  |                         | (75,896  | ) |      |   | (157,619 | )    |  |   | (123,825 | )
|Capital expenditures                                                                   |  |                         | (30,383  | ) |      |   | (21,859  | )    |  |   | (35,015  | )
|Investments in cost and equity method investees                                        |  |                         | (11,604  | ) |      |   |         |      |  |   |         |  
|Investments in life insurance policies                                                 |  |                         | (478     | ) |      |   | (717     | )    |  |   | (1,107   | )
|Proceeds from sales of investments                                                     |  |                         | 7,044    |   |      |   |         |      |  |   | 31,938   |  
|Purchases of investments                                                               |  |                         |         |   |      |   |         |      |  |   | (16,437  | )
|Proceeds from sale of assets                                                           |  |                         | 7,037    |   |      |   | 4,171    |      |  |   | 2,459    |  
|                                                                                       |  |                         |          |   |      |   |          |      |  |   |          |  
|Net cash used in investing activities                                                  |  | $                       | (104,280 | ) |      | $ | (176,024 | )    |  | $ | (141,987 | )
|                                                                                       |  |                         |          |   |      |   |          |      |  |   |          |  
|                                                                                       |  |                         |         
|Cash flows (used in) provided by financing activities:                                 |  |                         |          |   |      |   |          |      |  |   |          |  
|Proceeds from issuance of senior convertible notes                                     |  |                         |         |   |      |   | 215,000  |      |  |   |         |  
|Proceeds from credit facility                                                          |  |                         |         |   |      |   | 35,682   |      |  |   | 186,345  |  
|Repayments of credit facility                                                          |  |                         |         |   |      |   | (78,150  | )    |  |   | (143,877 | )
|Proceeds from other borrowings                                                         |  |                         | 13,543   |   |      |   |         |      |  |   | 31,491   |  
|Repayments of other borrowings                                                         |  |                         | (27,170  | ) |      |   | (71,436  | )    |  |   | (20,967  | )
|Payments of capital lease obligations                                                  |  |                         | (14,460  | ) |      |   | (2,711   | )    |  |   | (2,041   | )
|Proceeds from stock option exercises                                                   |  |                         | 3,515    |   |      |   | 3,971    |      |  |   | 8,101    |  
|Payments of financing costs                                                            |  |                         | (169     | ) |      |   | (9,079   | )    |  |   | (2,064   | )
|                                                                                       |  |                         |          |   |      |   |          |      |  |   |          |  
|Net cash (used in) provided by financing activities                                    |  | $                       | (24,741  | ) |      | $ | 93,277   |      |  | $ | 56,988   |  
|                                                                                       |  |                         |          |   |      |   |          |      |  |   |          |  
|                                                                                       |  |                         |         
|Net increase (decrease) in cash and cash equivalents                                   |  |                         | 89,008   |   |      |   | 41,392   |      |  |   | (26,817  | )
|Net effect of currency translation on cash                                             |  |                         | 75       |   |      |   | (134     | )    |  |   | (208     | )
|Cash and cash equivalents - beginning of period                                        |  |                         | 88,521   |   |      |   | 47,263   |      |  |   | 74,288   |  
|                                                                                       |  |                         |          |   |      |   |          |      |  |   |          |  
|Cash and cash equivalents - end of period                                              |  | $                       | 177,604  |   |      | $ | 88,521   |      |  | $ | 47,263   |  
|                                                                                       |  |                         |          |   |      |   |          |      |  |   |          |  
|                                                                                       |  |                         |         
|Supplemental cash flow information:                                                    |  |                         |          |   |      |   |          |      |  |   |          |  
|Interest paid                                                                          |  | $                       | 27,385   |   |      | $ | 22,985   |      |  | $ | 13,898   |  
|Income taxes paid, net of refunds                                                      |  | $                       | 5,694    |   |      | $ | 2,147    |      |  | $ | 665      |  
|                                                                                       |  |                         |         
|Supplemental disclosure of non-cash information:                                       |  |                         |          |   |      |   |          |      |  |   |          |  
|Equipment acquired under capital lease                                                 |  | $                       | 2,243    |   |      | $ | 1,901    |      |  | $ | 880      |  
|Shares issued for acquisitions (1.875 million during 2010 and 7.5 million during 2008) |  | $                       | 27,044   |   |      | $ |         |      |  | $ | 59,250   |  
|Notes to sellers of Wanzek                                                             |  | $                       |         |   |      | $ |         |      |  | $ | 55,000   |  

The accompanying
notes are an integral part of these consolidated financial statements.



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MASTEC, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Note 1 - Nature of the Business

MasTec, Inc. (collectively with its
subsidiaries, MasTec or the Company) is a leading national infrastructure construction company operating mainly throughout the United States across a range of industries. The Companys activities include the engineering,
building, installation, maintenance and upgrade of energy, communication and utility infrastructure, including but not limited to: electrical utility transmission and distribution, wind farms, solar farms, other renewable energy, natural gas and
petroleum pipeline infrastructure, wireless, wireline, satellite communications, industrial infrastructure and water and sewer systems. MasTecs customers are primarily in the utility, communications and government industries.

Note 2 - Summary of Significant Accounting Policies

The following is a summary of the significant accounting policies followed in the preparation of the accompanying consolidated financial statements. On July 1, 2009, the Financial Accounting
Standards Board (FASB) issued the FASB Accounting Standards Codification (ASC or the Codification), the single source of authoritative, nongovernmental U.S generally accepted accounting principles
(GAAP), except for rules and interpretive releases of the Securities and Exchange Commission (SEC), which are sources of authoritative GAAP for SEC registrants. All other nongrandfathered, non-SEC accounting literature
not included in the Codification is nonauthoritative. The new guidelines and numbering system prescribed by the Codification are used when referring to GAAP in this Form 10-K. As the Codification was not intended to change or alter existing GAAP, it
has not had any impact on the Companys consolidated financial statements.

Management estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions
that affect the amounts reported in the financial statements and accompanying notes. Key estimates for MasTec include: the recognition of revenue, in particular, on long term construction contracts, including estimates to complete and provisions for
contract losses; allowance for doubtful accounts; accrued self-insured claims; goodwill, acquisition-related contingent consideration, and intangible assets; securities available for sale; asset lives used in computing depreciation and amortization,
including amortization of intangibles; accounting for income taxes; contingencies; and litigation. While management believes that such estimates are fair when considered in conjunction with the consolidated financial position and results of
operations taken as a whole, actual results could differ from those estimates and such differences may be material to the financial statements.

Principles of consolidation

The
accompanying consolidated financial statements include MasTec, Inc. and its subsidiaries and include the assets, liabilities, revenues and expenses of all majority-owned subsidiaries over which the Company exercises control and, when applicable,
entities for which the Company has a controlling financial interest. Intercompany accounts and transactions have been eliminated in consolidation. The Companys investments in nonconsolidated affiliates, with interests ranging between 20% and
50%, are accounted for using the equity method and are recorded within other long-term assets in the consolidated balance sheets. Net income or loss from these investments is recorded in other (income) expense, net, in the consolidated statements of
income. Unrelated third parties hold the remaining ownership interests in these investments. Investments with less than a 20% interest are accounted for using the cost method. Other parties interests in companies for which MasTec has
controlling financial interest are reported as non-controlling interests within total equity. Net income or loss attributable to non-controlling interests is reported as a separate line item below total net income from continuing operations.

Reclassifications

Certain reclassifications were made to the prior year financial statements to conform to the current period presentation.



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Comprehensive income

Comprehensive income is a measure of net income and all other changes in equity that result from transactions other than those with
shareholders. Comprehensive income consists of net income, unrealized gains and losses from securities available for sale, foreign currency translation adjustments and losses from non-controlling interests.

Accumulated other comprehensive losses of $6.2 million and $6.1 million as of December 31, 2010 and 2009, respectively, are
primarily attributable to the Companys investments in securities available for sale. See Note 7 - Securities Available for Sale.

Revenue recognition

Revenue and related costs
for master and other service agreements billed on a time and materials basis are recognized as the services are rendered. Services are also performed under master and other service agreements billed on a fixed fee basis. Under fixed fee master
service and similar type service agreements, MasTec furnishes various specified units of service for a separate fixed price per unit of service. For service agreements on a fixed fee basis, profitability will be reduced if the actual costs to
complete each unit exceed original estimates.

Revenues from fixed price contracts are recognized using the
percentage-of-completion method, measured by the percentage of costs incurred to date to total estimated costs for each contract. These contracts provide for a fixed amount of revenues for the entire project. Such contracts provide that the customer
accept completion of progress to date and compensate the Company for services rendered, which may be measured in terms of units installed, hours expended or some other measure of progress. Contract costs include all direct materials, labor and
subcontract costs and those indirect costs related to contract performance, such as indirect labor, supplies, tools, repairs and the operational costs of capital equipment (excluding depreciation). Much of the materials associated with the
Companys work are customer-furnished and are therefore not included in contract revenues and costs. The cost estimation process is based on the professional knowledge and experience of the Companys engineers, project managers and
financial professionals. Changes in job performance, job conditions and final contract settlements are factors that influence managements assessment of total contract value and the total estimated costs to complete those contracts and
therefore, the Companys profit recognition. Changes in these factors may result in revisions to costs and income, and their effects are recognized in the period in which the revisions are determined. Provisions for losses on uncompleted
contracts are made in the period in which such losses are determined to be probable and the amount can be reasonably estimated.

The Company may incur costs subject to change orders, whether approved or unapproved by the customer, and/or claims related to certain
contracts. Management determines the probability that such costs will be recovered based upon evidence such as engineering studies and legal opinions, past practices with the customer, specific discussions, correspondence or preliminary negotiations
with the customer. The Company treats items as a cost of contract performance in the period incurred if it is not probable that the costs will be recovered, or defers costs and/or recognizes revenue if it is probable that the contract price will be
adjusted and can be reliably estimated. As of December 31, 2010, change orders and/or claims that were in the process of being negotiated in the normal course of business for which costs have been deferred or that had been included as contract
price adjustments were immaterial.

Billings in excess of costs and estimated earnings on uncompleted contracts are classified
as current liabilities. Any costs and estimated earnings in excess of billings are classified as current assets. Work in process on contracts is based on work performed but not yet billed to customers as per individual contract terms.

Allowance for doubtful accounts

The Company maintains an allowance for doubtful accounts for estimated losses resulting from the inability of its customers to make
required payments. Management analyzes the collectibility of accounts receivable and the adequacy of the allowance for doubtful accounts on a regular basis based on the aging of account balances, historical bad debt experience, customer
concentrations, customer credit-worthiness, customer financial condition and credit reports, availability of mechanics and other liens, existence of payment bonds and other sources of payment and current economic trends for reporting units
where losses have occurred historically and are considered to be ordinary course, reserves are established for anticipated losses based on statistical analysis of the accounts receivable portfolio. For reporting units where historical losses have
been immaterial, an increase in the allowance for doubtful accounts is recorded when it is probable a receivable is not collectible and the loss can be reasonably estimated. Amounts are written off against the allowance when deemed uncollectible.



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Cash and cash equivalents

All short-term highly liquid investments with original maturities of three months or less are considered to be cash equivalents and are
stated at cost, which approximates market value. Restricted cash included in cash and cash equivalents represents cash deposited in support of letters of credit issued through the Companys credit facility. The Companys credit facility
provides full availability for those funds, and there is no reduction in liquidity. Restricted cash is invested in certificates of deposit with maturities equal to or less than 90 days.

Fair value of financial instruments

Financial instruments in the Companys consolidated balance sheets include cash and cash equivalents, accounts and notes receivable, cash collateral deposited with insurance carriers, cash surrender
value of life insurance policies, auction rate securities, cost and equity method investments, deferred compensation plan assets and liabilities, accounts payable and other current liabilities, acquisition-related contingent consideration and debt
obligations.

Fair value is the price that would be received to sell an asset or paid to transfer a liability (an exit price)
in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The Company uses a three-tier valuation hierarchy based upon observable and non-observable inputs,
as described below:

Level 1 - Quoted market prices in active markets for identical assets or liabilities at the measurement
date.

Level 2 - Observable market based inputs or other observable inputs corroborated by market data at the measurement date,
other than quoted prices included in Level 1, either directly or indirectly.

Level 3 - Significant unobservable inputs that
cannot be corroborated by observable market data and reflect the use of significant management judgment. These values are generally determined using valuation models for which the assumptions utilize managements estimates of market participant
assumptions.

Fair values of financial instruments are estimated through the use of public market prices, quotes from
financial institutions and other available information. Due to their short-term maturity, the carrying amounts of cash and cash equivalents, accounts and notes receivable and accounts payable and other current liabilities approximate their fair
values. Management believes the carrying values of cash collateral deposited with insurance carriers and deferred compensation plan assets and liabilities approximate their fair values. Cost and equity method investments are initially recorded at
their cost basis. The fair value of the Companys cost and equity method investments are not readily available, however, disclosure of their fair value is not required. Management is not aware of events or changes in circumstances that would
have a material adverse effect on the carrying value of the Companys cost or equity method investments.

See Note 6 -
Fair Value of Financial Instruments for estimated fair values and carrying amounts of the Companys other financial instruments.

Securities Available for Sale

The Companys securities
available for sale consist of auction-rate securities. These auction rate securities represent interests in pools of student loans guaranteed by the U.S. government under the Federal Family Education Loan Program and a structured finance security.
The structured finance security has an attached credit default swap under which the principal value would be partially or fully forfeited at net default rates on the underlying corporate debt obligations ranging from 8% to 9% as of December 31,
2010. The actual net default rate as of December 31, 2010 is 4.89%. Both the structured finance security and the credit default swap are collateralized by investment grade credit-linked notes made up of floating rate international bank notes or
credit card receivable notes.

Securities available-for-sale are recorded at estimated fair value as long-term
assets. Temporary unrealized holding gains and losses are recorded as a separate component of accumulated other comprehensive income (loss), net of applicable income taxes. Unrealized losses are charged against earnings when a decline in fair value
is determined to be other-than-temporary. An impairment is considered to be other-than-temporary if an entity intends to sell a security, more likely than not will be required to sell a security before recovering its cost, or does not expect to
recover a securitys entire amortized cost basis, even if there is no intent to sell the security.



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The Company considers several factors in assessing whether a loss is other-than-temporary.
These factors include, but are not limited to: the intent and more likely than not, the ability to hold a security for a period of time sufficient to allow for recovery of its fair value; the length of time a security is in an unrealized loss
position; the extent to which fair value is less than cost; the financial condition and near term prospects of the issuer; changes to the credit ratings of securities, as well as their underlying assets; and, for the Companys structured
finance security, rates of default on the underlying portfolio of credit default swaps.

In assessing the expectation of
recovering a securitys amortized cost basis, management performs an assessment of the present value of cash flows expected to be collected. If this assessment yields an amount less than the amortized cost basis of the security, even if the
Company has the intent, and more likely than not, the ability to hold the securities, a credit loss is deemed to exist. The amount of an other-than-temporary impairment attributed to the credit losses is recognized in earnings, while the amount of
an other-than-temporary impairment related to other factors is recognized in other comprehensive income, net of applicable deferred income taxes. The Company estimates credit losses associated with its auction rate securities using Level 3 inputs.
Credit loss estimates are derived by comparing the estimated fair value of the securities, which are based on a number of factors, including estimated probabilities of default, with the value that would have been derived if the probability of
default for the same securities were zero percent. The difference between the recorded fair value and the estimated fair value assuming a zero probability of default is considered the portion of total decline in fair value attributable to credit
losses.

Due to the liquidity issues associated with auction rate securities and the corresponding lack of activity in this
market, there was insufficient observable market data to determine the fair value of the Companys auction rate securities as of December 31, 2010. Therefore, their fair value was estimated by an independent valuation firm, Houlihan
Capital Advisors, LLC, using a probability weighted discounted cash flow model. The model incorporates assumptions that market participants would use in their estimates of fair value such as reset interest rates, final stated maturities, collateral
values, credit quality and insurance, and applies the probabilities of either (a) a successful auction; (b) a failed auction; or (c) a default; at each auction, which represent Level 3 fair value inputs. This valuation is sensitive to
market conditions and managements judgment and can change significantly based on the assumptions used. Factors that may impact the valuation include: changes to credit ratings of the securities and, for the structured finance securities,
changes to the credit ratings of the underlying assets supporting the securities as well as rates of default of the underlying assets, underlying collateral values, discount rates, counterparty risk and ongoing strength and quality of market credit
and liquidity.

See Note 7 - Securities Available for Sale for further discussion.

Inventories

Inventories consist of materials and supplies for construction and install to the home projects. Inventories are valued at the lower of cost (using the specific identification method) or market.
Construction projects are completed pursuant to customer specifications. For materials or supplies purchased on behalf of specific customers or projects, loss of the customer or cancellation of the project could result in an impairment of the value
of materials purchased. Technological or market changes can also render certain materials obsolete. Allowances for inventory obsolescence are determined based upon the specific facts and circumstances and market conditions. As of December 31,
2010 and 2009, inventory obsolescence reserves were immaterial.

Property and equipment

Property and equipment are recorded at cost. Depreciation is computed using the straight-line method over the estimated useful
lives of the respective assets. Leasehold improvements are depreciated over the shorter of the term of the lease or the estimated useful lives of the improvements. Expenditures for repairs and maintenance are charged to expense as incurred.
Expenditures for betterments and major improvements are capitalized and depreciated over the remaining useful lives of the assets. The carrying amounts of assets sold or retired and related accumulated depreciation are eliminated in the year of
disposal and the resulting gains and losses are included in other income or expense.



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Deferred costs

Deferred financing costs related to the Companys credit facility, senior notes and senior convertible notes, whose short and
long-term portions are included in other current and non-current assets in the consolidated balance sheets, are amortized over the related terms of the debt using the effective interest method. Net deferred financing costs were $11.2 million and
$14.3 million at December 31, 2010 and 2009, respectively.

Software capitalization

The Company capitalizes certain costs incurred in connection with developing or obtaining internal use software.
These capitalized software costs are included in property and equipment, net, in the consolidated balance sheets and are amortized over a period not to exceed seven years.

Valuation of Long-Lived Assets

Management
reviews long-lived assets, consisting primarily of property and equipment and intangible assets with finite lives, for impairment whenever events or changes in circumstances indicate that their carrying amounts may not be realizable. If an
evaluation is required, the estimated future undiscounted cash flows associated with the asset are compared to the assets carrying amount to determine if there has been an impairment. The amount of an impairment is calculated as the difference
between the fair value of the asset and its carrying value. Estimates of future undiscounted cash flows are based on managements view of growth rates for the related business, anticipated future economic conditions and estimates of residual
values. Estimated fair values take into consideration appropriate discount rates relative to risk. Management believes that these estimates are consistent with assumptions that marketplace participants would use in their estimates of fair value.
During the years ended December 31, 2010, 2009 and 2008, no material impairment charges were incurred relating to the Companys long-lived assets.

Valuation of Goodwill and Intangible Assets

Goodwill acquired in a purchase business combination and determined to have an infinite useful life is not amortized,
but instead tested for impairment at least annually. Management conducts, on at least an annual basis, a review of the Companys reporting units to determine if the carrying values of the reporting units exceed their estimated fair values,
using a discounted cash flow methodology. This analysis requires several estimates, including future cash flows and growth rates for the reporting units, as well as the selection of a discount rate. Goodwill impairment may exist if the net book
value of the reporting unit exceeds its estimated fair value. Should this be the case, the value of goodwill may be impaired and a write down may be required. Acquired intangible assets are recognized and amortized over their useful lives, which
could be based on contractual or legal rights. Management periodically reviews long-lived intangible assets for impairment.

Accrued insurance

MasTec maintains insurance policies subject to per claim deductibles of $1 million for its workers compensation policy, $2 million for its general liability policy and $2 million for
its automobile liability policy. The Company has excess umbrella coverage up to $100 million per claim and in the aggregate. MasTec actuarially determines liabilities for unpaid claims and associated expenses, including incurred but not
reported losses, and reflects the present value of those liabilities in the balance sheet as other current and non-current liabilities. The determination of such claims and expenses and appropriateness of the related liability is reviewed and
updated quarterly. Accruals are based upon known facts, historical trends and a reasonable estimate of future expenses. However, a change in experience or actuarial assumptions could materially affect results of operations in a particular period. As
of December 31, 2010 and 2009, MasTecs liability for unpaid claims and associated expenses, including incurred but not reported losses, was $36.3 million and $31.6 million, respectively, of which $22.9 million and $22.1 million,
respectively, was reflected within non-current other liabilities.

The Company also maintains an insurance policy with respect
to employee group health claims subject to annual per employee maximum losses of $0.4 million. MasTecs liability for employee group claims, which is based on statistical analysis of historical claims experience and specific knowledge of actual
losses that have occurred, as of December 31, 2010 and 2009 was $1.4 million and $0.8 million, respectively.



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The Company is required to post letters of credit and provide cash collateral to its
insurance carriers. As of December 31, 2010 and 2009, these letters of credit amounted to $59.5 million and $66.9 million, respectively, a portion of which is collateralized by $18.0 million of restricted cash at both December 31, 2010 and
2009. In addition, other cash collateral deposited with insurance carriers amounted to $2.2 million and $3.0 million as of December 31, 2010 and 2009, respectively, which is included in other assets in the consolidated balance sheets.

Income taxes

The Company records income taxes using the asset and liability method of accounting for deferred income taxes. Under this method, deferred tax assets and liabilities are recognized for the expected future
tax consequence of temporary differences between the financial statement and income tax basis of the Companys assets and liabilities. Income taxes are estimated in each of the jurisdictions in which the Company operates. This process involves
estimating the tax exposure together with assessing temporary differences resulting from differing treatment of items, such as deferred revenue, for tax and accounting purposes. These differences result in deferred tax assets and liabilities, which
are included within the consolidated balance sheets. The recording of a net deferred tax asset assumes the realization of such asset in the future. Otherwise, a valuation allowance must be recorded to reduce this asset to its net realizable value.
Management considers future pretax income and ongoing prudent and feasible tax planning strategies in assessing the net realizable value of tax assets and the need for such a valuation allowance. In the event that management determines that the
Company may not be able to realize all or part of a net deferred tax asset in the future, a valuation allowance for the deferred tax asset is charged against income in the period such determination is made.

Stock-based compensation

The Company has granted to employees and others restricted stock and options to purchase common stock. Non-cash stock compensation expense for administrative employees is included in general and
administrative expense, and for operational employees, is included within cost of sales in the consolidated statements of operations.

Grants of restricted stock are valued based on the market price of MasTecs common stock on the date of grant. Compensation expense arising from restricted stock grants with graded vesting is
recognized using the ratable method (an accelerated method of expense recognition) over the vesting period. Those shares issued with cliff vesting are amortized on a straight line basis over the vesting period. Vesting periods for grants of
restricted stock range from day of issuance to five years.

During each of the three years ended December 31, 2010, there
were no stock options granted. For stock options granted in prior periods, the Black-Scholes valuation model was used to estimate the fair value of options to purchase MasTecs common stock, and the Company uses the ratable method to amortize
compensation expense over the vesting period of the option grant.

See Note 12 - Stock-Based Compensation Plans for further
discussion.

Multi-employer pensions plans

The Company makes contributions to certain union-administered multi-employer pension plans. Contributions are generally based on fixed
amounts per hour per employee for employees covered under these plans.

See Note 13 - Retirement Plans and Note 16 -
Commitments and Contingencies for additional details.

New accounting pronouncements

Recently adopted accounting pronouncements

In June 2009, the FASB issued SFAS No. 166, Accounting for Transfers of Financial Assets, an amendment to SFAS No. 140 codified in Accounting Standards Update (ASU)
2009-16 (ASU 2009-16). The new standard eliminates the concept of a qualifying special-purpose entity, changes the requirements for derecognizing financial assets, and requires additional disclosures in order to enhance
information reported to users of financial statements by providing greater transparency about transfers of financial assets, including securitization transactions, and an entitys continuing involvement in and exposure to the risks related to
transferred financial assets. ASU 2009-16 is effective for fiscal years beginning after November 15, 2009. The adoption of ASU 2009-16 on January 1, 2010 did not have an impact on MasTecs consolidated financial statements.



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In June 2009, the FASB issued SFAS No. 167, Amendments to FASB Interpretation
No. 46(R) (SFAS 167), codified in ASU 2009-17. SFAS 167 amends FASB Interpretation No. 46(R), Variable Interest Entities,in determining whether an entity is a variable interest entity (VIE) and requires an
enterprise to perform an analysis to determine whether the enterprises variable interest or interests give it a controlling financial interest in a VIE. Under ASU 2009-17, an enterprise has a controlling financial interest when it has
(a) the power to direct the activities of a VIE that most significantly impact the entitys economic performance and (b) the obligation to absorb losses of the entity or the right to receive benefits from the entity that could
potentially be significant to the VIE. ASU 2009-17 requires an enterprise to assess whether it has an implicit financial responsibility to ensure a VIE operates as designed when determining whether it has power to direct the activities of the VIE
that most significantly impact the entitys economic performance. ASU 2009-17 also requires ongoing assessments of whether an enterprise is the primary beneficiary of a VIE, requires enhanced disclosures and eliminates the scope exclusion for
qualifying special-purpose entities. The adoption of ASU 2009-17 on January 1, 2010 did not have a material impact on MasTecs consolidated financial statements.

In October 2009, the FASB ratified EITF consensus No. 09-1 and issued ASU No. 2009-15, Accounting for Own - Share Lending Arrangements in Contemplation of Convertible Debt Issuance or Other
Financing(ASU 2009-15). ASU 2009-15 requires an entity that enters into a share-lending arrangement on its own shares (that are classified in equity pursuant to other authoritative accounting guidance) in contemplation of a
convertible debt issuance or other financing to initially measure the share-lending arrangement at fair value and treat it as an issuance cost and to exclude the shares borrowed under the share-lending arrangement from basic and diluted EPS. In
addition, under ASU 2009-15, if it becomes probable that the share-lending arrangement counterparty will default on the arrangement, the issuing entity should record a loss in current earnings equal to the fair value of the shares outstanding less
any recoveries. The entity will continue to adjust the loss until actual default. Upon an actual default, the issuing entity must include the shares outstanding under the share-lending arrangement (net of any share recoveries) in basic and diluted
EPS. The ASU also requires entities to provide certain disclosures about the share-lending arrangement. The adoption of ASU 2009-15 on January 1, 2010 had no impact on the Companys consolidated financial statements as the Company has not
entered into any share-lending arrangements.

In January 2010, the FASB issued ASU 2010-01, Accounting for Distributions to
Shareholders with Components of Stock and Cash, (ASU 2010-01) which provides guidance on accounting for such distributions, clarifying that in calculating EPS, an entity should account for the share portion of the distribution as a
stock issuance and not as a stock dividend, and therefore include the shares issued or issuable as part of a distribution that is reflected in basic EPS prospectively. The adoption of ASU 2010-01 as of January 1, 2010 had no impact on the
consolidated financial statements as the Company has not made any distributions to shareholders.

In January 2010, the FASB
issued ASU 2010-02, Accounting and Reporting for Decreases in Ownership of a Subsidiary - a Scope Clarification(ASU 2010-02), in response to practice issues entities encountered in applying the decrease in ownership provisions of
SFAS No. 160, Non-controlling Interests in Consolidated Financial Statements (codified in ASC 810-10, Consolidation(ASC 810-10)). ASU 2010-02 clarifies that the decrease in ownership provisions of ASC 810-10 and
related guidance apply to (a) a subsidiary or group of assets that is a business or nonprofit activity, (b) a subsidiary or group of assets that is a business or nonprofit activity for a non-controlling interest in an entity (including an
equity method investee or joint venture) and (c) an exchange of a group of assets that constitutes a business or nonprofit activity for a non-controlling interest in an entity (including an equity method investee or joint venture). In addition,
ASU 2010-02 clarifies that the decrease in ownership guidance does not apply to sales of in-substance real estate or conveyances of oil and gas mineral rights, even if these transactions involve businesses. Finally, the ASU expands the disclosures
required upon deconsolidation of a subsidiary. The adoption of ASU 2010-02 on January 1, 2010 had no impact on the Companys consolidated financial statements as the Company has not had any decreases in ownership of its subsidiaries during
2010.

In January 2010, the FASB issued ASU 2010-06, Improving Disclosures about Fair Value Measurements
(ASU 2010-06) which amends ASC 820 to add new requirements for disclosures about transfers into and out of Levels 1 and 2 and separate disclosures about purchases, sales, issuances, and settlements relating to Level 3 measurements. ASU
2010-06 also clarifies existing fair value disclosures about level of disaggregation and about inputs and valuation techniques used to measure fair value. Further, ASU 2010-06 amends guidance on employers disclosures about postretirement
benefit plan assets under ASC 715, Compensation - Retirement Benefits to require that disclosures be provided by classes of assets instead of by major categories of assets. ASU 2010-06 is effective for the first reporting period beginning
after December 15, 2009, except for the requirement to provide the Level 3 activity of purchases, sales, issuance, and settlements on a gross basis, which will be effective for fiscal years beginning after December 15, 2010, and for
interim periods within those fiscal years. See Note 6 - Fair Value of Financial Instruments for related disclosures.



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In February 2010, the FASB issued ASU 2010-09, Amendments to Certain Recognition and
Disclosure Requirements, (ASU 2010-09) which amends ASC 855,Subsequent Events, to address certain implementation issues related to an entitys requirement to perform and disclose subsequent events procedures. ASU 2010-09
requires SEC filers to evaluate subsequent events through the date the financial statements are issued and exempts SEC filers from disclosing the date through which subsequent events have been evaluated. The ASU was effective immediately upon
issuance. The adoption of ASU 2010-09 did not have a material impact on the Companys consolidated financial statements.

In March 2010, the FASB issued ASU 2010-11, Scope Exception Related to Embedded Credit Derivatives (ASU 2010-11),
which updates ASC Topic 815, Derivatives and Hedging (ASC 815) and addresses the application of the embedded derivative scope exception in ASC 815. ASU 2010-11 primarily affects entities that hold or issue investments in financial
instruments that contain embedded credit derivative features (including entities that consolidate a variable interest entity that issues financial instruments containing embedded credit derivative features). Additionally, ASU 2010-11s
transition provision permits entities to make a special one-time election to apply the fair value option to any investment in a beneficial interest in securitized financial assets, regardless of whether such investments contain embedded derivative
features. ASU 2010-11 is effective for the first fiscal quarter beginning after June 15, 2010. The adoption of ASU 2010-11 as of July 1, 2010 did not have a material impact on the Companys consolidated financial statements.

In October 2009, the FASB issued ASU No. 2009-13,Multiple - Deliverable Revenue Arrangements, (ASU
2009-13). ASU 2009-13 amends existing revenue recognition accounting pronouncements that are currently within the scope of ASC Subtopic 605-25, Multiple - Element Arrangements. ASU 2009-13 provides accounting principles and application
guidance on whether multiple deliverables exist, how the arrangement should be separated and the consideration allocated. This guidance eliminates the requirement to establish the fair value of undelivered products and services and also eliminates
the residual method of allocating arrangement consideration. The new guidance provides for separate revenue recognition based upon managements estimate of the selling price for an undelivered item when there is no other means to determine the
fair value of that undelivered item. Under the previous guidance, if the fair value of all of the elements in the arrangement was not determinable, then revenue was deferred until all of the items were delivered or fair value was determined. This
new approach is effective for fiscal years beginning on or after June 15, 2010. Entities can elect to apply ASU 2009-13 (i) prospectively to new or materially modified arrangements after its effective date or (ii) retrospectively for
all periods presented. The adoption of ASU 2009-13 did not have a material impact on the Companys financial statements.

In July 2010, the FASB issued ASU 2010-20, Disclosures about the Credit Quality of Financing Receivables and the Allowance for Credit
Losses(ASU 2010-20). ASU 2010-20 improves disclosures about the credit quality of an entitys financing receivables and related allowance for credit losses by facilitating evaluation of the nature of credit risk inherent in an
entitys portfolio of financing receivables, how that risk is analyzed and assessed in arriving at the allowance for credit losses and the changes and reasons for those changes in the allowance for credit losses. A financing receivable is
defined as a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the entitys statement of financial position including loans, trade accounts receivable, notes receivable, credit
cards receivables and lease receivables, except for operating leases. Short term trade receivables and receivables measured at fair value or lower of cost or fair value are excluded. Further, the standard defines two levels of disaggregation for
disclosure purposes: portfolio segment and class of financing receivables. The disclosures relating to disaggregated investment balances, allowance for credit losses, nonaccrual status, credit quality indicators, credit risk factors and impairment
of financing receivables are effective for interim and annual periods ending on or after December 15, 2010. The disclosures about activity that occurs during a reporting period are effective for interim and annual reporting periods beginning on
or after December 15, 2011. See Note 8 - Accounts Receivable, Costs and Earnings in Excess of Billings and Retainage, Net of Allowance for related disclosures.



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Recently issued accounting standards, not adopted as of December 31, 2010

In April 2010, the FASB issued ASU 2010-17, Milestone Method of Revenue Recognition, a consensus of the FASB
Emerging Issues Task Force(ASU 2010-17). This update provides guidance on defining a milestone under Topic 605, Revenue Recognition - Milestone Method, and determining when it may be appropriate to apply the milestone
method of revenue recognition for research or development transactions. Consideration that is contingent on achievement of a milestone in its entirety may be recognized as revenue in the period in which the milestone is achieved only if the
milestone is judged to meet certain criteria to be considered substantive. Milestones should be considered substantive in their entirety and may not be bifurcated. An arrangement may contain both substantive and nonsubstantive milestones that should
be evaluated individually. ASU 2010-17 is effective on a prospective basis for milestones achieved in fiscal years, and interim periods within those years, beginning on or after June 15, 2010 with early adoption permitted. The Company is
currently evaluating the potential impact of this standard on its financial position and results of operations.

In December
2010, the FASB issued ASU 2010-28, Intangibles - Goodwill and Other (Topic 350): When to Perform Step 2 of the Goodwill Impairment Test for Reporting Units with Zero or Negative Carrying Amounts (ASU 2010-28). ASU 2010-28 modifies
Step 1 of the goodwill impairment test for reporting units with zero or negative carrying amounts. For those reporting units, an entity is required to perform Step 2 of the goodwill impairment test if it is more likely than not that a goodwill
impairment exists. In determining whether it is more likely than not that a goodwill impairment exists, an entity should consider whether there are any adverse qualitative factors indicating that an impairment may exist. ASU 2010-28 is effective for
fiscal years, and interim periods within those years, beginning after December 15, 2010. The Company is currently evaluating the potential impact of this standard on its financial position and results of operations.

In December 2010, the FASB issued ASU 2010-29, Business Combinations (Topic 805): Disclosure of Supplementary Pro Forma Information
for Business Combinations, a consensus of the FASB Emerging Issues Task Force (ASU 2010-29). The objective of ASU 2010-29 is to address diversity in practice relating to the interpretation of pro forma revenue and earnings disclosure
requirements for business combinations. Under ASU 2010-29, comparative financial statements should disclose revenue and earnings of the combined entity as if the business combinations that have occurred during the current year had been in effect as
of the beginning of the comparable prior annual reporting period only. Additionally, ASU 2010-29 expands the supplemental pro forma disclosures under Topic 805 to include a description of the nature and amount of material, nonrecurring pro forma
adjustments directly attributable to the business combinations included in reported pro forma revenue and earnings. ASU 2010-29 is effective prospectively for business combinations acquired on or after the beginning of the first annual reporting
period beginning on or after December 15, 2010. The Company is currently evaluating the potential impact of this standard on its consolidated financial statements.

Note 3 - Earnings Per Share

Basic earnings per share is computed by
dividing earnings available to MasTecs common shareholders by the weighted average number of common shares outstanding for the period. Diluted earnings per share reflects the potential dilution that could occur if stock options and unvested
restricted stock (common stock equivalents), securities, or other contracts to issue common stock were exercised or converted into common stock or resulted in the issuance of common stock that then shared in the earnings of MasTec.

As described in Note 10 - Debt, the Company had convertible notes outstanding during each of the three years ended
December 31, 2010. The convertible notes are reflected in the calculation of diluted earnings per share for the corresponding periods by application of the if converted method to the extent their effect is dilutive. Under the
if-converted method, in computing the dilutive effect of the Companys convertible notes, net income is adjusted to add back the after-tax amount of interest recognized in the period associated with the convertible notes, and
correspondingly, the convertible notes are assumed to have been converted with the resulting common shares added to weighted average shares outstanding.

The following table summarizes the Companys outstanding convertible notes during the three years ended December 31, 2010, 2009 and 2008, including their respective classification within the
computation of earnings per share for each year (in thousands).



|                                                     |  |      |         |  |      |   |         |      |  |   |        | 
|---------------------------------------------------- |  | ---- | ------- |  | ---- | - | ------- | ---- |  | - | ------ | 
|                                                     |  | 2010 |         |  | 2009 |   |         | 2008 | 
|Dilutive:                                            |  |      |         |  |      |   |         |      |  |   |        | 
|4.0% senior convertible notes, issued June 2009      |  | $    | 115,000 |  |      | $ | 115,000 |      |  |   | N/A    | 
|4.25% senior convertible notes, issued November 2009 |  |      | 100,000 |  |      |   | 100,000 |      |  |   | N/A    | 
|8.0% convertible notes                               |  |      | N/A     |  |      |   | N/A     |      |  | $ | 55,000 | 
|                                                     |  |      |        
|Anti-dilutive:                                       |  |      |         |  |      |   |         |      |  |   |        | 
|8.0% convertible notes                               |  |      | N/A     |  |      | $ | 55,000  |      |  |   | N/A    | 



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The following table represents a reconciliation of MasTecs net income and weighted
average shares outstanding for the calculation of basic and diluted earnings per share (in thousands, except per share amounts):



|                                                               |  |      |        |  |      |   |        |      |  |   |        |  
|-------------------------------------------------------------- |  | ---- | ------ |  | ---- | - | ------ | ---- |  | - | ------ | -
|                                                               |  | 2010 |        |  | 2009 |   |        | 2008 | 
|Basic                                                          |  |      |        |  |      |   |        |      |  |   |        |  
|Net income (loss) attributable to MasTec:                      |  |      |        |  |      |   |        |      |  |   |        |  
|Continuing operations                                          |  | $    | 90,528 |  |      | $ | 70,748 |      |  | $ | 66,602 |  
|Discontinued operations                                        |  |      |       |  |      |   |       |      |  |   | (814   | )
|                                                               |  |      |        |  |      |   |        |      |  |   |        |  
|Net income attributable to MasTec                              |  | $    | 90,528 |  |      | $ | 70,748 |      |  | $ | 65,788 |  
|                                                               |  |      |        |  |      |   |        |      |  |   |        |  
|Shares:                                                        |  |      |        |  |      |   |        |      |  |   |        |  
|Weighted average shares outstanding                            |  |      | 76,132 |  |      |   | 75,701 |      |  |   | 67,983 |  
|                                                               |  |      |        |  |      |   |        |      |  |   |        |  
|                                                               |  |      |       
|Basic earnings (loss) per share attributable to MasTec:        |  |      |        |  |      |   |        |      |  |   |        |  
|Continuing operations                                          |  | $    | 1.19   |  |      | $ | 0.93   |      |  | $ | 0.98   |  
|Discontinued operations                                        |  |      |       |  |      |   |       |      |  |   | (0.01  | )
|                                                               |  |      |        |  |      |   |        |      |  |   |        |  
|Basic earnings per share attributable to MasTec                |  | $    | 1.19   |  |      | $ | 0.93   |      |  | $ | 0.97   |  
|                                                               |  |      |        |  |      |   |        |      |  |   |        |  
|                                                               |  |      |       
|Diluted                                                        |  |      |        |  |      |   |        |      |  |   |        |  
|Net income:                                                    |  |      |        |  |      |   |        |      |  |   |        |  
|Basic net income attributable to MasTec                        |  | $    | 90,528 |  |      | $ | 70,748 |      |  | $ | 65,788 |  
|Interest expense on 4.0% senior convertible notes, net of tax  |  |      | 2,700  |  |      |   | 2,260  |      |  |   |       |  
|Interest expense on 4.25% senior convertible notes, net of tax |  |      | 2,494  |  |      |   | 419    |      |  |   |       |  
|Interest expense on 8% convertible notes, net of tax           |  |      |       |  |      |   |       |      |  |   | 183    |  
|                                                               |  |      |        |  |      |   |        |      |  |   |        |  
|Diluted net income attributable to MasTec                      |  | $    | 95,722 |  |      | $ | 73,427 |      |  | $ | 65,971 |  
|                                                               |  |      |        |  |      |   |        |      |  |   |        |  
|                                                               |  |      |       
|Shares:                                                        |  |      |        |  |      |   |        |      |  |   |        |  
|Basic weighted average shares outstanding                      |  |      | 76,132 |  |      |   | 75,701 |      |  |   | 67,983 |  
|Effect of dilutive common stock equivalents                    |  |      | 1,022  |  |      |   | 1,025  |      |  |   | 744    |  
|Effect of dilutive 4.0% senior convertible notes               |  |      | 7,297  |  |      |   | 4,134  |      |  |   |       |  
|Effect of dilutive 4.25% senior convertible notes              |  |      | 6,462  |  |      |   | 903    |      |  |   |       |  
|Effect of dilutive 8% convertible notes                        |  |      |       |  |      |   |       |      |  |   | 189    |  
|                                                               |  |      |        |  |      |   |        |      |  |   |        |  
|Diluted weighted average shares outstanding                    |  |      | 90,913 |  |      |   | 81,763 |      |  |   | 68,916 |  
|                                                               |  |      |        |  |      |   |        |      |  |   |        |  
|                                                               |  |      |       
|Diluted earnings (loss) per share attributable to MasTec:      |  |      |        |  |      |   |        |      |  |   |        |  
|Continuing operations                                          |  | $    | 1.05   |  |      | $ | 0.90   |      |  | $ | 0.97   |  
|Discontinued operations                                        |  |      |       |  |      |   |       |      |  |   | (0.01  | )
|                                                               |  |      |        |  |      |   |        |      |  |   |        |  
|Diluted earnings per share attributable to MasTec              |  | $    | 1.05   |  |      | $ | 0.90   |      |  | $ | 0.96   |  
|                                                               |  |      |        |  |      |   |        |      |  |   |        |  

As described in Note 21 - Subsequent Events, in January 2011, the Company completed a debt exchange offer
related to its outstanding 4.0% senior convertible notes and 4.25% senior convertible notes. In connection with this debt exchange offer, $100.6 million of its original 4.0% senior convertible notes and $97 million of its original 4.25% senior
convertible notes were canceled and exchanged for identical principal amounts of new 4.0% and 4.25% senior convertible notes (the New Notes) for an exchange fee of 50 basis points, or 0.5%, which totaled approximately $1 million. The
terms of the New Notes are substantially similar to the original notes, except that the New Notes have an optional physical, cash or combination settlement feature and contain certain conditional conversion features. Due to the optional cash
settlement feature and managements intent to settle the principal amount in cash, the conversion shares underlying the principal amount of the New Notes will not be included in the Companys diluted share count in future periods. If the
average stock price per share exceeds the $15.76 conversion price for the new 4.0% senior convertible notes or the $15.48 conversion price for the new 4.25% senior convertible notes, the resulting amount, in shares, of any premium will be included
in the Companys diluted share count. Following the exchange offer, $14.4 million and $3.0 million of the original 4.0% and 4.25% notes, respectively, remain outstanding.

Beginning in January 2011 upon the issuance of the New Notes, the Company will bifurcate the principal balance of the New Notes between the fair value of the common stock conversion feature and the fair
value of the New Notes. As a result, the value of the New Notes will be discounted and the discount will be accreted to interest expense over the remaining term of the New Notes using the effective interest method. This will increase
interest expense during the term of the New Notes above the 4.0% and 4.25% cash coupon interest rates to an effective interest rate of approximately 6.7%. The fair value of the common stock conversion feature will be recorded as a component of
stockholders equity.



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Note 4 - Acquisitions and Joint Ventures

Precision

Effective November 1, 2009, MasTec purchased all of the issued and outstanding membership interests of Precision Pipeline, LLC and Precision Transport Company, LLC (together, Precision)
for approximately $126 million in cash, the assumption of $34 million of Precisions debt and a five-year earn-out equal to 40% of Precisions earnings before interest, taxes, depreciation and amortization (EBITDA) (as defined
in the purchase agreement) for the last two months of 2009 and 30% of Precisions annualized EBITDA in excess of $35 million for the remainder of the earn-out period, payable at MasTecs option in cash or, under certain circumstances,
shares of MasTec common stock or a combination thereof.

Precision, based in Eau Claire, Wisconsin, is a leading energy
infrastructure services provider, specializing in the construction and maintenance of large diameter pipelines. Precisions experience in the long-haul, interstate pipeline industry complements the Companys existing energy infrastructure
service offerings, which include natural gas gathering systems, processing plants and compression stations and mid-stream pipelines. The acquisition of Precision enhances MasTecs end-to-end design and construction capabilities within the
energy industry.

The following table summarizes the estimated fair value of consideration paid for Precision and the
allocation of purchase price to the fair value of assets acquired and liabilities assumed at the date of acquisition (in millions).



|                                                            |  |   |        |  
|----------------------------------------------------------- |  | - | ------ | -
|Purchase Price Consideration:                               |  |   |        |  
|Cash                                                        |  | $ | 126.4  |  
|Debt assumed                                                |  |   | 33.6   |  
|Fair value of contingent consideration (earn-out)           |  |   | 54.2   |  
|                                                            |  |   |        |  
|Total consideration                                         |  | $ | 214.2  |  
|                                                            |  |   |        |  
|Preliminary Purchase Price Allocation:                      |  |   |        |  
|Current assets                                              |  | $ | 94.7   |  
|Non-compete agreements                                      |  |   | 1.8    |  
|Customer contracts                                          |  |   | 14.5   |  
|Goodwill                                                    |  |   | 139.0  |  
|Property and equipment                                      |  |   | 56.3   |  
|                                                            |  |   |        |  
|Total assets acquired                                       |  | $ | 306.3  |  
|                                                            |  |   |        |  
|Current liabilities                                         |  |   | (92.1  | )
|Liability arising from contingent consideration arrangement |  |   | (54.2  | )
|Long-term debt                                              |  |   | (33.6  | )
|                                                            |  |   |        |  
|Total liabilities assumed                                   |  | $ | (179.9 | )
|                                                            |  |   |        |  
|Net assets acquired                                         |  | $ | 126.4  |  
|                                                            |  |   |        |  

The fair value of the earn-out arrangement associated with the Precision acquisition was estimated at $54.2
million using the income approach incorporating significant inputs not observable in the market (Level 3 inputs under ASC 820). Key assumptions include probability adjusted EBITDA projections and the use of the risk-free rate as a discount factor,
as the risk is reflected in the EBITDA probability assessment. The range of potential undiscounted payments that the Company could be required to make under the earn-out arrangement was estimated to be between $0 and $65 million, however, there is
no maximum earn-out payment amount. During 2010, new information about significant opportunities for Precision that existed at the acquisition date resulted in revising the probabilities applied to EBITDA projections upward. Accordingly, the Company
recorded a measurement period adjustment to increase the acquisition date fair value of the contingent consideration liability by $13.9 million. Additionally, the Company remeasured the contingent consideration liability as of December 31, 2010
using currently available facts and circumstances including Precisions 2010 performance, resulting in an incremental increase in the contingent consideration liability of $0.5 million, which was recorded within other expense during the year
ended December 31, 2010. The Company paid $9.7 million of contingent consideration related to this earn-out arrangement during the second quarter of 2010.



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On April 1, 2010, the Precision sellers paid MasTec a purchase price adjustment of
approximately $5.4 million based on Precisions final net working capital as of the closing date as prescribed in the purchase agreement. A total net increase in goodwill of $15.5 million was recorded during 2010 as a result of the following
(in millions):



|                                                                                                          |  |   |      |  
|--------------------------------------------------------------------------------------------------------- |  | - | ---- | -
|Increase in estimated fair value of contingent consideration                                              |  | $ | 13.9 |  
|Reduction in the estimated fair value of accounts receivable and billings in excess of costs and earnings |  |   | 2.5  |  
|Increase in liabilities, excluding billings in excess of costs and earnings                               |  |   | 3.0  |  
|Assignment of joint venture to sellers                                                                    |  |   | 1.5  |  
|Purchase price adjustment                                                                                 |  |   | (5.4 | )
|                                                                                                          |  |   |      |  
|Net increase in goodwill                                                                                  |  | $ | 15.5 |  
|                                                                                                          |  |   |      |  

As required by the Business Combinations Topic of the FASB Codification, balances at December 31, 2009
have been updated to reflect the above purchase accounting adjustments. See the consolidated balance sheet for current period presentation.

The intangible asset related to customer contracts is amortized over the expected remaining term of these contracts, consistent with the pattern in which the related benefits will be consumed, over its
two-year useful life. The intangible asset related to non-compete agreements with the sellers is being amortized over its seven-year term. Goodwill of $139.0 million arising from the acquisition represents the value of the assembled union workforce
as well as the industry-specific project management expertise of Precisions management team.

Current assets of $94.7
million include accounts receivable, costs and earnings in excess of billings and retainage of $83.2 million. The gross contractual amounts due total $85.3 million, of which $2.1 million is not expected to be collected.

In connection with the acquisition of Precision in the fourth quarter of 2009, total acquisition costs of approximately $0.5 million were
recognized within selling, general and administrative expenses.

Tax deductible goodwill for the Precision acquisition as of
December 31 was as follows (in millions):



|                   |  |   |      | 
|------------------ |  | - | ---- | 
|As of
December 31, |  |   |     
|2010               |  | $ | 86.5 | 
|2009               |  | $ | 82.8 | 

Wanzek

In December 2008, MasTec purchased all of the issued and outstanding shares of Wanzek Construction, Inc.,
(Wanzek) for: (i) $50 million in cash, (ii) 7.5 million shares of MasTec common stock, which were valued at $59.3 million based on the average market price five days before and after the date the terms of the acquisition
were agreed to and announced, (iii) an 8% convertible note in the principal amount of $55 million due December 2013 with interest payments payable in April, August, and December of each year, commencing in April 2009 (the Wanzek
convertible notes), (iv) the assumption of up to $15 million of Wanzeks debt and (v) a two-year earn-out equal to 50% of Wanzeks EBITDA over $40 million per year. The purchase agreement provides for piggyback
registration rights without penalty or registration payment arrangements. The acquisition was effective as of December 1, 2008, and accordingly, Wanzeks earnings have been consolidated as of that date.

Wanzek, headquartered in Fargo, North Dakota, has been in business for almost 40 years and manages a team of highly-skilled workers and
tradesmen who are deployed throughout the country and who are capable of working under extreme weather conditions. Wanzek currently derives a significant portion of its revenue from wind farm construction and maintains a fleet of heavy equipment,
including a number of specialized heavy cranes, a critical component for the successful erection of wind turbine towers. With the acquisition of Wanzek, MasTec is capable of providing end-to-end construction services to wind farm owners and
developers. The Wanzek acquisition complements MasTecs existing expertise and contracts in the construction of the electrical collection systems, substations and transmission lines necessary to connect energy from wind farms to the power grid.
Wanzek brings additional experience and capabilities to MasTec in the construction of natural gas processing plants and compression stations, and other heavy/civil and industrial process construction.



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On June 1, 2009, MasTec entered into a note purchase option agreement with Wanzek which
allowed the Company to repurchase all, or part of, the Wanzek convertible notes at any time on or prior to July 31, 2009 for the principal amount thereof plus all accrued interest. Pursuant to the note purchase option agreement, to the extent
that on or prior to July 31, 2009, MasTec completed an offering with net proceeds in excess of the principal amount of the Wanzek convertible notes plus all interest accrued thereon, the Company was required to exercise its option to repurchase
all of the Wanzek convertibles notes. Accordingly, as $115 million of 4% senior convertible notes were issued in June 2009, the Company repurchased the $55 million Wanzek convertible notes plus approximately $2 million of accrued interest.

In connection with the note purchase option agreement, the Company also agreed to remove the six-month transfer restrictions
that would have otherwise been applicable to the 7.5 million shares of MasTec common stock issued to the sellers of Wanzek in connection with the acquisition and allowed the sellers of Wanzek to participate in a secondary offering of a total of
5.175 million shares of MasTec common stock. The common stock offering closed in June 2009, at a price of $12.125 per share. The Company did not receive any proceeds from the sale of the common stock, but did pay certain offering expenses of
approximately $0.2 million on behalf of the selling shareholders, which were recorded as additional goodwill.

Additionally,
during 2009, adjustments were recorded as additional goodwill related to (i) $2.3 million paid to the sellers of Wanzek as a purchase price adjustment based on Wanzeks final net working capital as of the effective closing date as
prescribed in the purchase agreement and (ii) a deferred tax liability of $13.2 million related to the trade name intangible. In 2010, MasTec paid the sellers an additional $0.8 million as a purchase price adjustment related to an adjustment to
the final net working capital.

The purchase price to acquire Wanzek, including transaction costs, has been allocated to the
assets acquired and liabilities assumed at the effective date of the acquisition based on estimated fair values, as summarized below (in millions):



|                                     |  |   |        |  
|------------------------------------ |  | - | ------ | -
|Current assets                       |  | $ | 69.0   |  
|Property and equipment               |  |   | 31.3   |  
|Other assets                         |  |   | 0.8    |  
|Customer contracts and relationships |  |   | 24.2   |  
|Trade name                           |  |   | 34.5   |  
|Non-compete agreement                |  |   | 1.3    |  
|Goodwill                             |  |   | 106.2  |  
|                                     |  |   |        |  
|Total assets acquired                |  | $ | 267.3  |  
|                                     |  |   |        |  
|Current liabilities                  |  |   | (58.2  | )
|Other liabilities                    |  |   | (29.4  | )
|Debt                                 |  |   | (12.8  | )
|                                     |  |   |        |  
|Total liabilities assumed            |  | $ | (100.4 | )
|                                     |  |   |        |  
|Net assets acquired                  |  | $ | 166.9  |  
|                                     |  |   |        |  

The portion of intangible assets related to existing customer contracts is amortized over the remaining term
of these contracts. The remaining portion of the intangible assets related to customer relationships is amortized on an accelerated basis in relation to the benefits received over its weighted average ten-year useful life. The intangible asset
related to the non-compete agreement with the seller is being amortized over its useful life of three years, and the Wanzek trade name has an indefinite life.

There was no tax deductible goodwill associated with the Wanzek acquisition.

DirectStar/Funraisers

On October 1, 2008, MasTec acquired from Red Ventures LLC, (Red Ventures), the same seller that sold DirectStar TV LLC (DirectStar) to MasTec, 100% of the membership interests
of Funraisers PR, LLC (Funraisers), a company engaged in a start-up business that provides marketing, advertising, promotion, and sales activities for internet data delivery service by satellite and certain other broadband companies.
DirectStar, together with its subsidiaries, including Funraisers, is referred to as the DirectStar Business. Funraisers earnings have been consolidated since the date of acquisition. Although MasTec did not pay any upfront consideration
for Funraisers at the closing, in connection with the transaction MasTec agreed to increase the earn-out payable with respect to DirectStar until December 31, 2018. Additionally, the Seller had an option to purchase the DirectStar Business back
from MasTec.



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In July 2010, MasTec entered into a purchase option agreement with Red
Ventures and certain of Red Ventures affiliates, which granted Red Ventures a purchase option to acquire the DirectStar Business and simultaneously terminated Red Ventures prior purchase option for the DirectStar Business described
above. In February 2011, this purchase option agreement was amended and restated, and as amended, grants to Red Ventures an option to purchase the DirectStar Business from MasTec at any time from March 1, 2012 to November 30, 2012, for an
amount equal to the sum of: (i) the shareholders equity of the DirectStar Business as of May 31, 2010, (ii) five percent (5%) of adjusted net income (generally, the net income (loss) before provision for income taxes) of
the DirectStar Business from January 1, 2010 until the last day of the month immediately prior to the date of the sale and (iii) $25,600,000. The purchase option also allows Red Ventures to pay up to 35% of the option purchase price in the
form of a secured note with a one year term. In connection with the amendment to the purchase option, MasTec agreed to increase certain commissions that DirectStar presently pays to Red Ventures for managing the DirectStar Business. DirectStar, in
support of the DIRECTV® installation business, provides marketing and sales services on behalf of DIRECTV®. Should Red Ventures execute its purchase option, the Companys revenues and profits from DIRECTV® would be materially reduced.

As of December 31, 2010 and 2009, the estimated fair value of the purchase option was $0, determined using a probability-weighted market-based approach including Level 3 inputs such as projected
EBITDA and EBITDA multiples. Management does not anticipate a material change in the fair value of the option as a result of the February 2011 option amendment.

Inclusion of pro forma results of operations as if the acquisition of Funraisers had been completed at the beginning of 2008 would not have a material impact on the results of operations for the year
ended December 31, 2008, as presented.

Tax deductible goodwill for the DirectStar/Funraisers acquisition as of
December 31 was as follows (in millions):



|                   |  |   |      | 
|------------------ |  | - | ---- | 
|As of
December 31, |  |   |     
|2010               |  | $ | 57.0 | 
|2009               |  | $ | 30.7 | 

Nsoro

On July 31, 2008, MasTec purchased certain assets of Nsoro, LLC (Nsoro) for a purchase price of $17.5
million, paid in cash at closing, plus the assumption of approximately $12 million in indebtedness and earn-out payments payable over an eight-year period equal to 50% of Nsoros earnings before taxes above certain minimum thresholds. The
earn-out is payable in cash and, in certain circumstances, MasTec common stock or a combination thereof at the Companys discretion.

On December 24, 2010, MasTec entered into an amendment to the asset purchase agreement with the seller of Nsoro. Under the revised terms, MasTec paid and delivered to the seller a one time $40
million cash payment plus 1,875,000 shares of MasTec common stock, which are restricted for one year from the date of issuance. These shares were valued at $27 million, based on the average market price five days before and after the terms of the
amendment were agreed to and announced. The amendment effectively reduces potential future earn-out payments in exchange for upfront consideration. The total payment of upfront purchase price consideration, valued at $67 million, was recorded as
additional goodwill. Future annual earn-out payments for the five years beginning in 2011 will be reduced to 27.5% of domestic annualized earnings before tax in excess of $40 million. Earn-outs will be payable, at MasTecs sole option, in
either cash, shares of MasTec common stock, or any combination thereof.

Nsoro is headquartered in Atlanta, Georgia and
specializes in wireless infrastructure management and construction. The strategic acquisition of Nsoro gives MasTec the opportunity to service its large communications customers wireless capital spending plans.

The initial purchase price to acquire Nsoro (excluding contingent consideration), including transaction costs of $2.4 million, has been
allocated to the assets acquired and liabilities assumed at the effective date of the acquisition based on estimated fair values, as summarized below (in millions).



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|                          |  |   |       |  
|------------------------- |  | - | ----- | -
|Current assets            |  | $ | 85.2  |  
|Property and equipment    |  |   | 0.7   |  
|Customer relationships    |  |   | 10.6  |  
|Trade name                |  |   | 1.0   |  
|Goodwill                  |  |   | 3.2   |  
|Other long-term assets    |  |   | 0.1   |  
|                          |  |   |       |  
|Total assets acquired     |  | $ | 100.8 |  
|                          |  |   |       |  
|Current liabilities       |  |   | (68.8 | )
|Debt                      |  |   | (12.1 | )
|                          |  |   |       |  
|Total liabilities assumed |  | $ | (80.9 | )
|                          |  |   |       |  
|Net assets acquired       |  | $ | 19.9  |  
|                          |  |   |       |  

Analysis of work in process, costs and estimated earnings in excess of billings and billings in excess of
costs resulted in reclassifying entries to gross-up amounts previously netted, and revised estimates in the valuation of acquired assets and liabilities since the initial purchase price allocation, which was finalized in the third quarter of 2009,
resulted in changes to goodwill. The customer relationship and trade name intangible assets are amortized on a straight-line basis over a twenty year and five year life, respectively, consistent with the benefits expected to be received. In
connection with the acquisition of Nsoro, management approved a plan to exit the activities of four Nsoro locations including the termination and/or relocation of the employees at these locations. These exit activities resulted in liabilities
assumed of approximately $0.2 million included in the allocation of purchase price above. These locations were substantially closed at the end of 2008.

Nsoros earnings have been consolidated since the date of acquisition. Inclusion of pro forma results of operations as if the acquisition had been completed at the beginning of 2008 would not have a
material impact on the results of operations for the year ended December 31, 2008, as presented.

Tax deductible goodwill
for the Nsoro acquisition as of December 31 was as follows (in millions):



|                   |  |   |      | 
|------------------ |  | - | ---- | 
|As of
December 31, |  |   |     
|2010               |  | $ | 75.0 | 
|2009               |  | $ | 8.5  | 

Pumpco

In May 2008, MasTec acquired all of the issued and outstanding capital stock of Pumpco, Inc. (Pumpco) for
a purchase price of $44 million, paid in cash, plus the retirement and assumption of certain indebtedness and earn-out payments payable over a five-year period equal to 50% of Pumpcos earnings before taxes above significant specified
thresholds. The earn-out is payable in cash or, at the Companys option, MasTec common stock or a combination thereof. In connection with the acquisition, the Company entered into a $22.5 million equipment term loan and used the proceeds to pay
off $8.7 million of Pumpco indebtedness with the balance used to pay a portion of the acquisition purchase price. In October 2010, the Company repaid the outstanding $13.4 million principal balance of the 7.05% equipment loan with the proceeds of a
new loan in the amount of $13.5 million, bearing interest at 3.5267%. The equipment term loan is secured by most of Pumpcos existing equipment and is guaranteed by MasTec. The equipment term loan is secured by most of Pumpcos existing
equipment and is guaranteed by MasTec. The acquisition is effective as of May 1, 2008, and, accordingly, Pumpcos earnings have been consolidated as of that date.

Pumpco, headquartered in Giddings, Texas, has been in business for over 25 years and specializes in midstream natural gas pipeline construction. The acquisition of Pumpco continues MasTecs
diversification and growth strategy and expands its presence and capabilities in servicing gas pipeline customers.

The
purchase price to acquire Pumpco, including transaction costs, has been allocated to the assets acquired and liabilities assumed at the effective date of the acquisition based on estimated fair values, as summarized below. The initial purchase price
allocation, which was finalized in the second quarter of 2009, has been adjusted to reflect additional deferred tax liabilities and goodwill (in millions).



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|                                     |  |   |       |  
|------------------------------------ |  | - | ----- | -
|Current Assets                       |  | $ | 11.3  |  
|Property and equipment               |  |   | 34.7  |  
|Customer contracts and relationships |  |   | 5.2   |  
|Non-compete agreement                |  |   | 1.7   |  
|Trade name                           |  |   | 2.4   |  
|Goodwill                             |  |   | 18.3  |  
|                                     |  |   |       |  
|Total assets acquired                |  | $ | 73.6  |  
|                                     |  |   |       |  
|Current liabilities                  |  |   | (3.7  | )
|Other liabilities                    |  |   | (8.8  | )
|Debt                                 |  |   | (9.5  | )
|                                     |  |   |       |  
|Total liabilities assumed            |  | $ | (22.0 | )
|                                     |  |   |       |  
|Net assets acquired                  |  | $ | 51.6  |  
|                                     |  |   |       |  

The portion of intangible assets related to existing customer contracts is amortized over the remaining term
of these contracts. The remaining portion of the intangible assets related to customer relationships is amortized on an accelerated basis in relation to the benefits received over its ten-year useful life. Intangible assets related to customer
contracts and relationships, the non-compete agreement with the seller, and the Pumpco trade name has a weighted average useful life of 13 years.

There was no tax deductible goodwill associated with the Pumpco acquisition.

Unaudited Pro Forma Information

The following unaudited pro forma data presents revenue and results of operations as if the acquisitions of Precision, Wanzek and Pumpco had occurred on January 1, 2008 for the year ended
December 31, 2008, and as if the acquisition of Precision had occurred on January 1, 2009 for the year ended December 31, 2009.



|                                  |  |                          |         |  |                 |   |         | 
|--------------------------------- |  | ------------------------ | ------- |  | --------------- | - | ------- | 
|                                  |  | Years Ended December 31, |        
|                                  |  | 2009(unaudited)          |         |  | 2008(unaudited) |  
|                                  |  | (In millions)            |        
|Revenue                           |  | $                        | 1,844.9 |  |                 | $ | 2,271.4 | 
|Income from continuing operations |  | $                        | 104.9   |  |                 | $ | 164.0   | 

Joint Ventures
and Other Investments

On November 16, 2010, MasTec entered into a membership interest purchase agreement and
invested $10 million to purchase a 33% voting interest in EC Source Services LLC (EC Source) and acquired a two-year option (the Merger Option) that grants MasTec the right, but not the obligation, to acquire EC Source via
merger. EC Source is an extra high voltage specialty transmission contractor, and MasTecs investment will be utilized to support working capital and bonding requirements as well as equipment purchases, as necessary, to meet the demands of EC
Sources existing and future projects.

If MasTec, in its sole discretion, exercises its option to acquire the remaining
67% interest in EC Source, it will be required to issue to the other EC Source equity holders an aggregate of 5,153,846 shares of MasTec common stock, subject to certain purchase price adjustments, plus a five-year earn-out, payable in either MasTec
shares or cash at MasTecs election, based on EC Sources EBITDA, generally equal to 20% of EC Sources annual EBITDA in excess of $15 million. The MasTec shares will be subject to transfer restrictions, which lapse 25% on the first
anniversary of the closing of the EC Source acquisition, an additional 25% on the second anniversary and the remaining 50% on the third anniversary.

Should MasTec exercise its Merger Option, the consummation of the acquisition will be subject to certain conditions, including customary closing conditions. Either MasTec or the EC Source members may
terminate the merger if MasTec has exercised the Merger Option but the closing of the acquisition has not occurred within six months after that exercise or if MasTec has not exercised the Merger Option within two years after its original investment.
See Note 21 - Subsequent Events.



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Through a 60%-owned consolidated subsidiary, MasTec invested $1.6 million for a 34% interest
in a rock extraction business in Panama (for a net beneficial ownership interest of 20.4%). This investment is accounted for under the equity method of accounting, and the investee had no significant operations during 2010. During 2010, MasTec
performed construction services for this investee and recognized revenue of approximately $1.8 million for the year ended December 31, 2010. As of December 31, 2010, approximately $2.1 million is included in costs and earnings in excess of
billings related to this customer.

The Company has certain other cost and equity method investments, which are not material
individually or in the aggregate as of December 31, 2010 or 2009. These investments are initially recorded at their cost basis and are periodically reviewed for changes in events or circumstances that could impact their carrying value. No
impairment charges were recorded during the years ended December 31, 2010, 2009 or 2008 relating to the Companys cost or equity method investments.

Note 5 - Goodwill and Other Intangible Assets

The following table sets
forth information for MasTecs goodwill and intangible assets as of December 31(in millions):



|                                     |  |      |       |   |                                   |  |          |      |  |   |                                   |   |  |  |          | 
|------------------------------------ |  | ---- | ----- | - | --------------------------------- |  | -------- | ---- |  | - | --------------------------------- | - |  |  | -------- | 
|                                     |  | 2010 |       |   | WeightedAverageAmortizationPeriod |  |          | 2009 |  |   | WeightedAverageAmortizationPeriod |  
|Amortizing intangible assets: (1)    |  |      |       |   |                                   |  |          |      |  |   |                                   |   |  |  |          | 
|Gross carrying amount                |  | $    | 75.2  |   |                                   |  |          |      |  | $ | 75.2                              |   |  |  |          | 
|Less: accumulated amortization       |  |      | (38.9 | ) |                                   |  |          |      |  |   | (25.9                             | ) |  |  |          | 
|                                     |  |      |       |   |                                   |  |          |      |  |   |                                   |   |  |  |          | 
|Amortizing intangible assets, net    |  | $    | 36.3  |   |                                   |  | 14 years |      |  | $ | 49.3                              |   |  |  | 11 years | 
|                                     |  |      |       |   |                                   |  |          |      |  |   |                                   |   |  |  |          | 
|Non-amortizing intangible assets:    |  |      |       |   |                                   |  |          |      |  |   |                                   |   |  |  |          | 
|Goodwill                             |  | $    | 613.4 |   |                                   |  |          |      |  | $ | 504.2                             |   |  |  |          | 
|Trade name                           |  |      | 35.3  |   |                                   |  |          |      |  |   | 35.3                              |   |  |  |          | 
|Other                                |  |      | 6.6   |   |                                   |  |          |      |  |   | 6.6                               |   |  |  |          | 
|                                     |  |      |       |   |                                   |  |          |      |  |   |                                   |   |  |  |          | 
|Non-amortizing intangible assets     |  | $    | 655.3 |   |                                   |  |          |      |  | $ | 546.1                             |   |  |  |          | 
|                                     |  |      |       |   |                                   |  |          |      |  |   |                                   |   |  |  |          | 
|Goodwill and other intangible assets |  | $    | 691.6 |   |                                   |  |          |      |  | $ | 595.4                             |   |  |  |          | 
|                                     |  |      |       |   |                                   |  |          |      |  |   |                                   |   |  |  |          | 



| | (1) | Consists principally of customer relationships, tradenames and non-compete agreements with finite lives.
| | --- | --------------------------------------------------------------------------------------------------------

The following table provides a reconciliation of changes in goodwill and other intangible assets for the years ended December 31,
2009 and 2010 (in millions):



|                                                  |  |          |       |   |                         |   |      |           |  |   |       |   |  |   |       |  
|------------------------------------------------- |  | -------- | ----- | - | ----------------------- | - | ---- | --------- |  | - | ----- | - |  | - | ----- | -
|                                                  |  |          |       |   | Other Intangible Assets |   |      |           | 
|                                                  |  | Goodwill |       |   | Non-amortizable         |   |      | Amortized |  |   | Total |  
|Balance at December 31, 2008                      |  | $        | 331.0 |   |                         | $ | 40.9 |           |  | $ | 48.7  |   |  | $ | 420.6 |  
|                                                  |  |          |       |   |                         |   |      |           |  |   |       |   |  |   |       |  
|Acquisitions and acquisition-related adjustments  |  |          | 112.2 |   |                         |   | 0.4  |           |  |   | 13.5  |   |  |   | 126.1 |  
|Earn-outs                                         |  |          | 61.6  |   |                         |   |     |           |  |   |      |   |  |   | 61.6  |  
|Amortization expense                              |  |          |      |   |                         |   |     |           |  |   | (12.9 | ) |  |   | (12.9 | )
|Other                                             |  |          | (0.6  | ) |                         |   | 0.6  |           |  |   |      |   |  |   |      |  
|                                                  |  |          |       |   |                         |   |      |           |  |   |       |   |  |   |       |  
|Balance at December 31, 2009                      |  | $        | 504.2 |   |                         | $ | 41.9 |           |  | $ | 49.3  |   |  | $ | 595.4 |  
|                                                  |  |          |       |   |                         |   |      |           |  |   |       |   |  |   |       |  
|Acquisitions                                      |  |          |      |   |                         |   |     |           |  |   |      |   |  |   |      |  
|Earn-outs                                         |  |          | 41.3  |   |                         |   |     |           |  |   |      |   |  |   | 41.3  |  
|Settlement of multiple year earn-out (See Note 4) |  |          | 67.0  |   |                         |   |     |           |  |   |      |   |  |   | 67.0  |  
|Amortization expense                              |  |          |      |   |                         |   |     |           |  |   | (13.0 | ) |  |   | (13.0 | )
|Other                                             |  |          | 0.9   |   |                         |   |     |           |  |   |      |   |  |   | 0.9   |  
|                                                  |  |          |       |   |                         |   |      |           |  |   |       |   |  |   |       |  
|Balance at December 31, 2010                      |  | $        | 613.4 |   |                         | $ | 41.9 |           |  | $ | 36.3  |   |  | $ | 691.6 |  
|                                                  |  |          |       |   |                         |   |      |           |  |   |       |   |  |   |       |  



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Information about estimated amortization expense for identifiable intangible assets that
have a finite life for the periods subsequent to December 31, 2010 is summarized in the following table (in millions):



|           |  |                     |      | 
|---------- |  | ------------------- | ---- | 
|           |  | AmortizationExpense |     
|2011       |  | $                   | 7.6  | 
|2012       |  |                     | 4.7  | 
|2013       |  |                     | 3.7  | 
|2014       |  |                     | 3.0  | 
|2015       |  |                     | 2.6  | 
|Thereafter |  |                     | 14.7 | 
|           |  |                     |      | 
|Total      |  | $                   | 36.3 | 
|           |  |                     |      | 

Management performs its annual impairment review of goodwill and certain intangible assets with indefinite
lives during the fourth quarter each year at the reporting unit level. Assets of acquired businesses and related goodwill are allocated to the corresponding reporting units. Management identifies the Companys reporting units by assessing
whether components holding purchased assets, including goodwill and related assumed liabilities, have discrete financial information available. To the extent that two or more components are deemed economically similar, those components are
aggregated into one reporting unit for purposes of the Companys annual goodwill impairment review.

The Companys
reporting units sell and provide contracting services, including building, installation, maintenance and upgrade services by primarily digging and drilling trenches and installing poles, pipe, towers, antennae, wire, and equipment. Many of our
reporting units perform these services across multiple industries, including telecommunications, utilities and government, and on behalf of a variety of customers, some of which contract services from multiple reporting units.

Management estimates the fair value of each reporting unit and compares the estimated fair value to its carrying value, including
goodwill. If the carrying value exceeds the estimated fair value, the value of the reporting units goodwill or other indefinite-lived intangibles may be impaired and could require a write down. During the three year period ended
December 31, 2010, management estimated the fair value of the Companys reporting units using a discounted cash flow methodology, which incorporates five-year projections of revenues, operating costs and cash flows considering historical
and anticipated future results, general economic and market conditions, as well as the impact of planned business and operational strategies. Management applied a discounted cash flow technique utilizing a terminal value equal to 5.5 times year five
EBITDA. Discount rates ranged from 8.5% to 10.7% per annum and represent the Companys estimated cost of capital at the time of the analysis. A 100 basis point change in the discount rate would not have had a material impact on the results
of the impairment analysis. Based upon these analyses, no material impairment charges were recorded in the three years ended December 31, 2010.

Note 6 - Fair Value of Financial Instruments

The following table presents
the carrying amounts and estimated fair values of certain financial instruments as of December 31, 2010 and 2009 (in millions):



|                                                |  |                   |       |  |                   |   |       |                |  |   |           |  |  |   |       | 
|----------------------------------------------- |  | ----------------- | ----- |  | ----------------- | - | ----- | -------------- |  | - | --------- |  |  | - | ----- | 
|                                                |  | December 31, 2010 |       |  | December 31, 2009 |  
|                                                |  | CarryingAmount    |       |  | FairValue         |   |       | CarryingAmount |  |   | FairValue | 
|Assets                                          |  |                   |       |  |                   |   |       |                |  |   |           |  |  |   |       | 
|Cash surrender value of life insurance policies |  | $                 | 8.3   |  |                   | $ | 8.3   |                |  | $ | 8.1       |  |  | $ | 8.1   | 
|Auction rate securities                         |  |                   | 19.0  |  |                   |   | 19.0  |                |  |   | 24.5      |  |  |   | 24.5  | 
|                                                |  |                   |       | 
|Liabilities                                     |  |                   |       |  |                   |   |       |                |  |   |           |  |  |   |       | 
|Acquisition-related contingent consideration    |  | $                 | 45.0  |  |                   | $ | 45.0  |                |  | $ | 54.2      |  |  | $ | 54.2  | 
|7.625% senior notes                             |  |                   | 150.0 |  |                   |   | 151.9 |                |  |   | 150.0     |  |  |   | 142.5 | 
|4.0% senior convertible notes                   |  |                   | 115.0 |  |                   |   | 139.2 |                |  |   | 115.0     |  |  |   | 120.9 | 
|4.25% senior convertible notes                  |  |                   | 100.0 |  |                   |   | 120.4 |                |  |   | 100.0     |  |  |   | 106.6 | 



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The following methods and assumptions were used to estimate the fair values of financial
instruments:

Cash surrender value of life insurance policies.Cash surrender values of life insurance
policies are based on current cash surrender values as quoted by insurance carriers, a Level 1 input. Life insurance policies support the Companys split dollar agreements and deferred compensation plan assets.

Auction Rate Securities. Due to lack of activity in the auction rate securities market, there was insufficient
observable market data to determine the fair values of the Companys auction rate securities. Therefore, the fair value of these investments was estimated by an independent valuation firm, Houlihan Capital Advisors, LLC, using a probability
weighted discounted cash flow model, a Level 3 input. See Note 7 - Securities Available for Sale.

Acquisition-related
contingent consideration.Under certain acquisition agreements, the Company has agreed to pay the sellers earn-outs based on the performance of the businesses acquired. Certain of these earn-out payments may be made in either
cash or, under certain circumstances, MasTec common stock at the Companys option. Acquisition-related contingent consideration is measured at its acquisition date fair value for business combinations subsequent to December 15, 2008.
Acquisition-related contingent consideration in the table above represents the estimated fair value of additional future earn-outs payable for such acquisitions and is based on managements estimates and entity-specific assumptions, which are
Level 3 inputs. See Note 4 - Acquisitions and Joint Ventures.

Debt.The estimated fair values of the
Companys $150 million 7.625% senior notes, $115 million 4% senior convertible notes, and $100 million 4.25% senior convertible notes are based on quoted market prices, Level 1 inputs.

Assets and Liabilities Measured at Fair Value on a Recurring Basis

As of December 31, 2010, the Company held certain assets and liabilities that are required to be measured at fair value on a
recurring basis. The fair value hierarchy requires the use of observable market data when available. In instances in which the inputs used to measure fair value fall into different levels of the fair value hierarchy, the fair value measurement
classification below has been determined based on the lowest level input that is significant to the fair value measurement in its entirety. Managements assessment of the significance of a particular item to the fair value measurement in its
entirety requires judgment, including the consideration of inputs specific to the asset or liability. The fair values of financial assets and liabilities measured on a recurring basis were determined using the following inputs at December 31,
2010 and 2009 (in millions):



|                                                |  |                               |      |  |                                                               |   |     |                                           |  |   |                                        |  |  |   |      | 
|----------------------------------------------- |  | ----------------------------- | ---- |  | ------------------------------------------------------------- | - | --- | ----------------------------------------- |  | - | -------------------------------------- |  |  | - | ---- | 
|                                                |  |                               |      |  | Fair Value MeasurementsUsing Inputs
Considered as Significant |  
|                                                |  | Fair Value
atDecember 31,2010 |      |  | Quoted Pricesin ActiveMarkets
forIdentical Assets(Level 1)    |   |     | SignificantOtherObservableInputs(Level 2) |  |   | SignificantUnobservableInputs(Level 3) | 
|Assets                                          |  |                               |      |  |                                                               |   |     |                                           |  |   |                                        |  |  |   |      | 
|Cash surrender value of life insurance policies |  | $                             | 8.3  |  |                                                               | $ | 8.3 |                                           |  | $ |                                       |  |  | $ |     | 
|Auction rate securities                         |  |                               | 19.0 |  |                                                               |   |    |                                           |  |   |                                       |  |  |   | 19.0 | 
|Liabilities                                     |  |                               |      |  |                                                               |   |     |                                           |  |   |                                        |  |  |   |      | 
|Acquisition-related contingent consideration    |  | $                             | 45.0 |  |                                                               | $ |    |                                           |  | $ |                                       |  |  | $ | 45.0 | 
|                                                |  |                              
|                                                |  |                               |      |  | Fair Value MeasurementsUsing Inputs
Considered as Significant |  
|                                                |  | Fair Value atDecember
31,2009 |      |  | Quoted Pricesin ActiveMarkets forIdentical Assets(Level 1)    |   |     | SignificantOtherObservableInputs(Level 2) |  |   | SignificantUnobservableInputs(Level 3) | 
|Assets                                          |  |                               |      |  |                                                               |   |     |                                           |  |   |                                        |  |  |   |      | 
|Cash surrender value of life insurance policies |  | $                             | 8.1  |  |                                                               | $ | 8.1 |                                           |  | $ |                                       |  |  | $ |     | 
|Auction rate securities                         |  |                               | 24.5 |  |                                                               |   |    |                                           |  |   |                                       |  |  |   | 24.5 | 
|Liabilities                                     |  |                               |      |  |                                                               |   |     |                                           |  |   |                                        |  |  |   |      | 
|Acquisition-related contingent consideration    |  | $                             | 54.2 |  |                                                               | $ |    |                                           |  | $ |                                       |  |  | $ | 54.2 | 



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The following tables provide a reconciliation between the beginning and ending balances of
items measured at fair value on a recurring basis that used significant unobservable inputs (Level 3) for the years ended December 31, 2010 and 2009 (in millions).



|                                                                                        |  |                         |      |  |                             |   |      |       |  |   |                                             |   |  |   |      |  
|--------------------------------------------------------------------------------------- |  | ----------------------- | ---- |  | --------------------------- | - | ---- | ----- |  | - | ------------------------------------------- | - |  | - | ---- | -
|                                                                                        |  | Auction Rate Securities |      |  |                             |  
|Year Ended December 31, 2010                                                            |  | Student Loan            |      |  | StructuredFinanceSecurities |   |      | Total |  |   | Acquisition-Related ContingentConsideration |  
|                                                                                        |  |                         |      | 
|Balances at December 31, 2009                                                           |  | $                       | 16.4 |  |                             | $ | 8.1  |       |  | $ | 24.5                                        |   |  | $ | 54.2 |  
|Sale of auction rate securities, cost basis                                             |  |                         |     |  |                             |   | (6.6 | )     |  |   | (6.6                                        | ) |  |   |     |  
|Realized gains on sale of auction rate securities                                       |  |                         |     |  |                             |   | 0.4  |       |  |   | 0.4                                         |   |  |   |     |  
|Reversal of unrealized losses included in other comprehensive income on securities sold |  |                         |     |  |                             |   | 0.9  |       |  |   | 0.9                                         |   |  |   |     |  
|Changes in fair value recorded in earnings                                              |  |                         |     |  |                             |   | (1.2 | )     |  |   | (1.2                                        | ) |  |   | 0.5  |  
|Changes in unrealized gains included in other comprehensive income                      |  |                         |     |  |                             |   | 1.0  |       |  |   | 1.0                                         |   |  |   |     |  
|Payments of contingent consideration                                                    |  |                         |     |  |                             |   |     |       |  |   |                                            |   |  |   | (9.7 | )
|                                                                                        |  |                         |      |  |                             |   |      |       |  |   |                                             |   |  |   |      |  
|Balances at December 31, 2010                                                           |  | $                       | 16.4 |  |                             | $ | 2.6  |       |  | $ | 19.0                                        |   |  | $ | 45.0 |  
|                                                                                        |  |                         |      |  |                             |   |      |       |  |   |                                             |   |  |   |      |  
|                                                                                        |  |                        
|                                                                                        |  | Auction Rate Securities |      |  |                             |  
|Year Ended December 31, 2009                                                            |  | Student Loan            |      |  | StructuredFinanceSecurities |   |      | Total |  |   | Acquisition-Related ContingentConsideration |  
|                                                                                        |  |                         |      | 
|Balances at December 31, 2008                                                           |  | $                       | 15.9 |  |                             | $ | 4.7  |       |  | $ | 20.6                                        |   |  | $ |     |  
|Changes in fair value recorded in earnings                                              |  |                         |     |  |                             |   | (6.1 | )     |  |   | (6.1                                        | ) |  |   |     |  
|Changes in unrealized gains included in other comprehensive income                      |  |                         | 0.5  |  |                             |   | 9.5  |       |  |   | 10.0                                        |   |  |   |     |  
|Acquisition-related contingent consideration recognized in connection with acquisitions |  |                         |     |  |                             |   |     |       |  |   |                                            |   |  |   | 54.2 |  
|                                                                                        |  |                         |      |  |                             |   |      |       |  |   |                                             |   |  |   |      |  
|Balances at December 31, 2009                                                           |  | $                       | 16.4 |  |                             | $ | 8.1  |       |  | $ | 24.5                                        |   |  | $ | 54.2 |  
|                                                                                        |  |                         |      |  |                             |   |      |       |  |   |                                             |   |  |   |      |  

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis

During the years ended December 31, 2010 and 2009, the Company had no significant measurements of assets or liabilities at fair value
on a nonrecurring basis subsequent to their initial recognition.

Note 7 - Securities Available for Sale

The Companys securities available for sale consist of auction-rate securities. Liquidity for auction rate securities was originally
intended to be provided by an auction process that would reset the applicable interest rate at pre-determined intervals, usually every 7, 28 or 35 days. Due to disruptions in the credit markets beginning in 2008, these auctions have not had
sufficient bidders to allow investors to complete a sale, indicating that immediate liquidity at par is unavailable. Given the uncertainty as to when the liquidity issues will improve, these securities are classified as long-term assets in the
consolidated balance sheet. The Companys auction rate securities represent interests in pools of student loans guaranteed by the U.S. government under the Federal Family Education Loan Program and structured finance security. The structured
finance security has an attached credit default swap under which the principal value would be partially or fully forfeited at net default rates on the underlying corporate debt obligations ranging from 8% to 9% as of December 31, 2010. The
actual net default rate as of December 31, 2010 is 4.89%. Both the structured finance security and the credit default swap are collateralized by investment grade credit-linked notes made up of floating rate international bank notes or credit
card receivable notes. During the fourth quarter of 2010, the Company sold two of its three structured finance securities.



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Due to the liquidity issues associated with auction rate securities and the corresponding
lack of activity in this market, there was insufficient observable market data to determine the fair value of the Companys auction rate securities as of December 31, 2010. Therefore, their fair value was estimated by an independent
valuation firm, Houlihan Capital Advisors, LLC, using a probability weighted discounted cash flow model. This valuation is sensitive to market conditions and managements judgment and can change significantly based on the assumptions used. The
following tables set forth the fair value of the Companys auction rate securities by type of security and underlying credit rating as of December 31, 2010 and 2009 (in millions):



|                              |  |                              |      |  |      |   |     |       |  |   |      | 
|----------------------------- |  | ---------------------------- | ---- |  | ---- | - | --- | ----- |  | - | ---- | 
|As of December 31, 2010       |  | Underlying Credit Rating (1) |     
|                              |  | A3/A-                        |      |  | CCC  |   |     | Total | 
|Underlying security:          |  |                              |      |  |      |   |     |       |  |   |      | 
|Student loans                 |  | $                            | 16.4 |  |      | $ |    |       |  | $ | 16.4 | 
|Structured finance securities |  |                              |     |  |      |   | 2.6 |       |  |   | 2.6  | 
|                              |  |                              |      |  |      |   |     |       |  |   |      | 
|                              |  |                              |     
|Total auction rate securities |  | $                            | 16.4 |  |      | $ | 2.6 |       |  | $ | 19.0 | 
|                              |  |                              |      |  |      |   |     |       |  |   |      | 
|                              | 
|As of December 31, 2009       |  | Underlying Credit Rating (1) |     
|                              |  | A3/A-                        |      |  | CCC- |   |     | Total | 
|Underlying security:          |  |                              |      |  |      |   |     |       |  |   |      | 
|Student loans                 |  | $                            | 16.4 |  |      | $ |    |       |  | $ | 16.4 | 
|Structured finance securities |  |                              |     |  |      |   | 8.1 |       |  |   | 8.1  | 
|                              |  |                              |      |  |      |   |     |       |  |   |      | 
|                              |  |                              |     
|Total auction rate securities |  | $                            | 16.4 |  |      | $ | 8.1 |       |  | $ | 24.5 | 
|                              |  |                              |      |  |      |   |     |       |  |   |      | 



| | (1) | The Companys auction rate securities maintain split ratings. For purposes of this table, securities are categorized according to their lowest rating. | 
| | --- | ------------------------------------------------------------------------------------------------------------------------------------------------------ | 

As of December 31, 2010, the yields on the Companys auction-rate
securities ranged from 1.69% to 2.41%. These yields represent the predetermined maximum reset rates that occur upon auction failures according to the specific terms within each securitys prospectus. The issuers have been making
interest payments when due. As of December 31, 2010, the weighted average yield for the Companys auction-rate securities was 2.09%. Total interest earned on the Companys auction-rate securities during the years ended
December 31, 2010, 2009 and 2008 was $0.7 million, $0.7 million and $1.5 million, respectively.

Structured Finance
Auction Rate Securities

During the fourth quarter of 2009, all of the Companys structured finance auction rate
securities were downgraded to non-investment grade by one or more of the credit rating agencies. Due to continued deterioration in credit quality of these securities, the Company deemed their decline in fair value to be an other-than-temporary
impairment and credit losses of $6.1 million were recognized, reducing the securities cost basis by a corresponding amount. During 2010, additional credit losses of $0.8 million were recognized.

In the fourth quarter of 2010, the Company sold two of its three structured finance securities for $7.0 million. The sold securities had
a cost basis of $6.6 million, with cumulative credit losses of $4.6 million recognized in prior periods. The cumulative credit losses were offset slightly by a realized gain of $0.4 million on the sale transaction, for a cumulative net realized loss
of $4.2 million on disposal. Details of the securities sold, as of the date of sale, are as follows (in millions):



|                                                             |  |   |      | 
|------------------------------------------------------------ |  | - | ---- | 
|Par value                                                    |  | $ | 11.2 | 
|Cost basis                                                   |  | $ | 6.6  | 
|Fair value                                                   |  | $ | 5.7  | 
|Cumulative realized losses                                   |  | $ | 4.2  | 
|Accumulated losses in other comprehensive income, gross      |  | $ | 0.9  | 
|Accumulated losses in other comprehensive income, net of tax |  | $ | 0.6  | 



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The cumulative realized losses of $4.2 million were recognized in other expense in the
consolidated statement of income, of which $4.0 million was recognized in 2009, and $0.2 million, net of realized gains, was recognized in 2010. Accumulated losses in other comprehensive income of $0.9 million and their related tax impact were
eliminated in conjunction with the disposal. Following the sale, the Company determined it no longer met the criteria for intent to hold with respect to its remaining structured finance auction rate security. As a result, the Company recognized
cumulative gross unrealized losses of $0.3 million, or $0.2 million, net of tax, associated with its remaining structured finance auction rate security in the fourth quarter of 2010.

Changes in the carrying amount and related fair value for the Companys auction rate securities during the years ended
December 31, 2010 and 2009 consist of the following (in millions):



|                                                                      |  |      |      |   |      |   |      |  
|--------------------------------------------------------------------- |  | ---- | ---- | - | ---- | - | ---- | -
|                                                                      |  | 2010 |      |   | 2009 |  
|Change in carrying amount resulting from:                             |  |      |      |   |      |   |      |  
|Sale of auction rate securities, cost basis                           |  | $    | (6.6 | ) |      | $ |     |  
|Reversal of unrealized losses on securities sold                      |  | $    | 0.9  |   |      | $ |     |  
|Unrealized gains recognized in other comprehensive income             |  | $    | 1.0  |   |      | $ | 10.0 |  
|Credit and other losses recognized in earnings, net of realized gains |  | $    | (0.8 | ) |      | $ | (6.1 | )
|                                                                      |  |      |      |   |      |   |      |  
|Net change in fair value                                              |  | $    | (5.5 | ) |      | $ | 3.9  |  
|                                                                      |  |      |      |   |      |   |      |  

Student Loan Auction Rate Securities

Management believes the temporary unrealized decline in estimated fair value as of December 31, 2010 associated with its student loan
auction rate securities is primarily attributable to the limited liquidity of these investments and overall market volatility. The Company expects to recover the remaining cost basis of its student loan auction rate securities, and does not intend
to sell, or believe that it will be required to sell, its student loan auction rate securities before recovery of their cost basis, which may be at maturity. Cumulative gross unrealized losses on the Companys student loan auction rate
securities, which are included as a component of other comprehensive income, total $1.1 million, or $0.7 million net of applicable income taxes as of December 31, 2010 and $1.0 million, or $0.6 million net of applicable income taxes as of
December 31, 2009.

Auction Rate Securities - Reconciliation of Cost Basis to Fair Value

All of the Companys auction rate securities have been in a continuous unrealized loss position for 12 months or longer as of
December 31, 2010 and 2009. The cost basis, gross cumulative unrealized losses and estimated fair values for these securities are as follows (in millions):



|                                                        |  |                         |      |  |                                           |   |      |            |  |   |      | 
|------------------------------------------------------- |  | ----------------------- | ---- |  | ----------------------------------------- | - | ---- | ---------- |  | - | ---- | 
|                                                        |  | December 31, 2010       |     
|                                                        |  | AdjustedCost Basis 
(1) |      |  | Gross 
CumulativeUnrealized(Losses)/Gains |   |      | Fair Value | 
|Auction rate securities  student loans                 |  | $                       | 17.5 |  |                                           | $ | (1.1 | )          |  | $ | 16.4 | 
|Auction rate securities  structured finance securities |  |                         | 2.3  |  |                                           |   | 0.3  |            |  |   | 2.6  | 
|                                                        |  |                         |      |  |                                           |   |      |            |  |   |      | 
|Total auction rate securities                           |  | $                       | 19.8 |  |                                           | $ | (0.8 | )          |  | $ | 19.0 | 
|                                                        |  |                         |      |  |                                           |   |      |            |  |   |      | 
|                                                        | 
|                                                        |  | December 31, 2009       |     
|                                                        |  | AdjustedCost Basis (1)  |      |  | Gross CumulativeUnrealized
Losses         |   |      | Fair Value | 
|Auction rate securities  student loans                 |  | $                       | 17.4 |  |                                           | $ | (1.0 | )          |  | $ | 16.4 | 
|Auction rate securities  structured finance securities |  |                         | 10.1 |  |                                           |   | (2.0 | )          |  |   | 8.1  | 
|                                                        |  |                         |      |  |                                           |   |      |            |  |   |      | 
|Total auction rate securities                           |  | $                       | 27.5 |  |                                           | $ | (3.0 | )          |  | $ | 24.5 | 
|                                                        |  |                         |      |  |                                           |   |      |            |  |   |      | 



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##### Table of Contents

|(1) | Adjusted cost basis reflects adjustments for credit and other losses recognized in earnings. Adjustments for credit and other losses on securities held as of
December 31, 2010 and 2009 totaled $2.7 million and $6.1 million, respectively. Par value of securities held as of December 31, 2010 and 2009 was $22.5 million and $33.7 million, respectively.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

As of December 31, 2010, contractual maturities of the Companys student loan auction rate securities range from 17 to 37
years, and for the structured finance security, 6 years.

Note 8 - Accounts Receivable, Costs and Earnings in Excess of Billings and
Retainage, Net of Allowance

Accounts receivable, classified as current, consists of the following (in millions):



|                                         |  |              |       |   |      |   |       |  
|---------------------------------------- |  | ------------ | ----- | - | ---- | - | ----- | -
|                                         |  | December 31, |      
|                                         |  | 2010         |       |   | 2009 |  
|Contract billings                        |  | $            | 309.8 |   |      | $ | 231.5 |  
|Retainage                                |  |              | 32.7  |   |      |   | 22.0  |  
|Costs and earnings in excess of billings |  |              | 110.4 |   |      |   | 79.8  |  
|                                         |  |              |       |   |      |   |       |  
|                                         |  | $            | 452.9 |   |      | $ | 333.3 |  
|Less allowance for doubtful accounts     |  |              | (8.5  | ) |      |   | (10.3 | )
|                                         |  |              |       |   |      |   |       |  
|Accounts receivable, net                 |  | $            | 444.4 |   |      | $ | 323.0 |  
|                                         |  |              |       |   |      |   |       |  

Retainage, which has been billed but is not due until completion of performance and acceptance by customers,
is expected to be collected within one year. Any receivables, including retainage, expected to be collected beyond a year are recorded in long-term other assets. The Company maintains an allowance for doubtful accounts, both for specific customers
and as a reserve against other past due balances for estimated losses resulting from the inability of customers to make required payments.

Activity for the allowance for doubtful accounts from continuing operations is as follows (in millions):



|                                                     |  |              |      |   |      |   |      |  
|---------------------------------------------------- |  | ------------ | ---- | - | ---- | - | ---- | -
|                                                     |  | December 31, |     
|                                                     |  | 2010         |      |   | 2009 |  
|Allowance for doubtful accounts at beginning of year |  | $            | 10.3 |   |      | $ | 11.7 |  
|Provision for doubtful accounts                      |  |              | 2.9  |   |      |   | 2.4  |  
|Amounts charged against the allowance                |  |              | (4.7 | ) |      |   | (3.8 | )
|                                                     |  |              |      |   |      |   |      |  
|Allowance for doubtful accounts at end of year       |  | $            | 8.5  |   |      | $ | 10.3 |  
|                                                     |  |              |      |   |      |   |      |  

Amounts charged against the allowance primarily represent the write-off of accounts which had been fully
reserved previously. The decrease in the allowance for doubtful accounts from December 31, 2009 to December 31, 2010 resulted from the collection or settlement in 2010 of certain outstanding balances for which specific reserves had been
established prior to December 31, 2009.

The Company has a trade receivable for a pay-when-paid project,
which provides for payment in quarterly installments over five years through June 2015. The receivable has been recorded at its net present value, with the non-current portion recorded within other long-term assets in the consolidated balance
sheets. Imputed interest will be recognized as interest income as earned. As of December 31, 2010, $3.5 million remained outstanding, with $2.7 million recorded in other long-term assets. During the year ended December 31, 2010, the
Company recognized $0.1 million in interest income in the consolidated statement of operations related to this receivable.



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Note 9 - Property and Equipment, Net

Property and equipment, net, including property and equipment under capital leases, is comprised of the following as of December 31,
2010 and 2009 (in millions):



|                                     |  |      |        |   |      |   |        |                                  |  |  |        | 
|------------------------------------ |  | ---- | ------ | - | ---- | - | ------ | -------------------------------- |  |  | ------ | 
|                                     |  | 2010 |        |   | 2009 |   |        | EstimatedUseful 
Lives(In Years) | 
|Land                                 |  | $    | 4.7    |   |      | $ | 4.7    |                                  |  |  |        | 
|Buildings and leasehold improvements |  |      | 11.1   |   |      |   | 11.0   |                                  |  |  | 5 - 40 | 
|Machinery and equipment              |  |      | 274.5  |   |      |   | 266.7  |                                  |  |  | 2 - 15 | 
|Office furniture and equipment       |  |      | 59.9   |   |      |   | 55.3   |                                  |  |  | 3 - 7  | 
|                                     |  |      |        |   |      |   |        |                                  |  |  |        | 
|Total property and equipment         |  | $    | 350.2  |   |      | $ | 337.7  |                                  |  |  |        | 
|Less accumulated depreciation        |  |      | (169.4 | ) |      |   | (138.9 | )                                |  |  |        | 
|                                     |  |      |        |   |      |   |        |                                  |  |  |        | 
|                                     |  |      |       
|Property and equipment, net          |  | $    | 180.8  |   |      | $ | 198.8  |                                  |  |  |        | 
|                                     |  |      |        |   |      |   |        |                                  |  |  |        | 

Property and equipment under capital leases are depreciated over their estimated useful lives.
Depreciation expense for the years ended December 31, 2010, 2009 and 2008 is $44.9 million, $36.6 million and $24.8 million, respectively.

Management reviews long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount may not be realizable. Based on the Companys analysis, there were no
material impairment charges during the three years ended December 31, 2010.

Note 10 - Debt

Debt is comprised of the following at December 31, 2010 and 2009 (in millions):



|                                                                                                      |  |      |       |   |      |   |       |  
|----------------------------------------------------------------------------------------------------- |  | ---- | ----- | - | ---- | - | ----- | -
|                                                                                                      |  | 2010 |       |   | 2009 |  
|7.625% senior notes due February 2017                                                                 |  | $    | 150.0 |   |      | $ | 150.0 |  
|4.0% senior convertible notes due June 2014                                                           |  |      | 115.0 |   |      |   | 115.0 |  
|4.25% senior convertible notes due December 2014                                                      |  |      | 100.0 |   |      |   | 100.0 |  
|7.05% equipment term loan due in installments through 2013                                            |  |      |      |   |      |   | 16.2  |  
|3.5276% equipment term loan due in installments through 2013                                          |  |      | 12.9  |   |      |   |      |  
|Capital lease obligations, weighted average interest rate of 5.2% due in installments through 2015    |  |      | 24.5  |   |      |   | 36.2  |  
|Notes payable for equipment, weighted average interest rate of 5.1%, due in installments through 2014 |  |      | 10.2  |   |      |   | 21.0  |  
|                                                                                                      |  |      |       |   |      |   |       |  
|Total debt                                                                                            |  | $    | 412.6 |   |      | $ | 438.4 |  
|Less current maturities                                                                               |  |      | (18.4 | ) |      |   | (28.5 | )
|                                                                                                      |  |      |       |   |      |   |       |  
|Long-term debt                                                                                        |  | $    | 394.2 |   |      | $ | 409.9 |  
|                                                                                                      |  |      |       |   |      |   |       |  

Credit Facility

The Company has a senior secured credit facility, which is referred to as the Credit Facility. The Credit Facility has a maximum amount of available borrowing capacity of $210 million, subject to certain
restrictions, and expires in May 2013. The maximum available borrowing capacity may be increased to $260 million, provided that the Company is in compliance with all provisions and covenants of the Credit Facility and that such additional borrowing
would not violate the indenture that governs the Companys senior notes. Interest on outstanding balances on the Credit Facility accrues at variable rates based, at the Companys option, on the agent banks base rate (as defined in
the Credit Facility) plus a margin of between 1.25% and 1.75%, or at LIBOR plus a margin of between 2.25% and 3.00%, depending on certain financial thresholds. At December 31, 2010, the margin over LIBOR was 2.25% and the margin over the base
rate was 1.25%. In addition, the Credit Facility includes an unused facility fee ranging from 0.5% to 0.75% based on usage. At December 31, 2010, the unused facility fee was 0.75%.



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The amount the Company can borrow under its Credit Facility at any given time is based upon
a formula that takes into account, among other things, eligible billed and unbilled accounts receivable, equipment, real estate and eligible cash collateral, which can result in borrowing availability of less than the full amount of the Credit
Facility. At December 31, 2010 and 2009, net availability under the Credit Facility totaled $124.2 million and $89.8 million, respectively, net of outstanding standby letters of credit aggregating $85.8 million and $79.8 million at
December 31, 2010 and 2009, respectively. These letters of credit mature at various dates and most have automatic renewal provisions subject to prior notice of cancellation. The Credit Facility is collateralized by a first priority security
interest in substantially all of the Companys assets and the assets of the Companys wholly-owned subsidiaries and a pledge of the stock of certain of the Companys operating subsidiaries. At December 31, 2010, the Company did
not have an outstanding balance on the Credit Facility for borrowed money.

In November 2010, the Company entered into an
amendment to its Credit Facility in connection with a debt exchange offer related to $115 million of the Companys outstanding 4.0% senior convertible notes and $100 million of the Companys outstanding 4.25% senior convertible notes.
Under the amendment, the lenders consented to the exchange offer and to the issuance of new 4.0% senior convertible and new 4.25% senior convertible notes, subject to, among other things, the condition that, prior to the expiration of the Credit
Facility in May 2013, the Company may not use any borrowings under the Credit Facility, or more than $10.0 million in the aggregate from cash on hand to defease, redeem or settle conversions of the new notes without prior consent of the lenders
under the Credit Facility. See Note 21 - Subsequent Events in the notes to the consolidated financial statements for additional information.

In November 2009, the Company entered into an amendment to its Credit Facility, pursuant to which the lenders consented to the Companys acquisition of Precision. Under the amendment, the
lenders consent to the Companys acquisition of Precision was conditioned upon the Companys raising a minimum of $75 million in financing. The Company also entered into an amendment in June 2009 to the Credit Facility. This
amendment provided the Company with the ability to repay the $55 million 8% Wanzek convertible note with proceeds from the $115 million 4% senior convertible notes issued in June 2009.

The Credit Facility contains customary events of default (including cross-default) provisions and covenants related to the Companys
operations that prohibit, among other things, making investments and acquisitions in excess of specified amounts, incurring additional indebtedness in excess of specified amounts, creating liens against the Companys assets, prepaying
subordinated indebtedness and engaging in certain mergers or combinations without the prior written consent of the lenders. The Credit Facility also limits the Companys ability to make certain distributions or pay dividends. In addition, the
Company is required to maintain a minimum fixed charge coverage ratio of 1.2 to 1.0, which is calculated as available cash flow divided by debt carrying costs, as defined in the Credit Facility. Any deterioration in the quality of billed and
unbilled receivables, reduction in the value of the Companys equipment or an increase in the Companys lease expense related to real estate would reduce availability under the Credit Facility. At December 31, 2010, the Company was in
compliance with all provisions and covenants of the Credit Facility.

Senior Convertible Notes

In November 2009, the Company issued $100 million of 4.25% senior convertible notes due December 15, 2014 in a private placement. The
senior convertible notes bear interest at a rate of 4.25% per year, payable semi-annually in arrears, on June 15 and December 15 of each year. On or prior to December 12, 2014, holders may convert their notes into shares of
MasTec common stock at an initial conversion rate of 64.6162 shares of MasTec common stock per $1,000 principal amount of notes, which represents an initial conversion price of approximately $15.48 per share, subject to customary anti-dilution
adjustment terms for these types of notes. Approximately $3.7 million in financing costs were incurred in connection with the issuance of these notes. These deferred financing costs are included in other assets in the consolidated balance sheet and
are being amortized over the term of the notes. The proceeds from the 4.25% senior convertible notes were used to fund the acquisition of Precision and for general corporate purposes.

In June 2009, the Company issued $115 million of 4% senior convertible notes due June 15, 2014 in a registered offering. The senior
convertible notes bear interest at a rate of 4% per year, payable semi-annually in arrears, on June 15 and December 15 of each year. On or prior to June 13, 2014, holders may convert their notes into shares of MasTec common stock
at an initial conversion rate of 63.4417 shares of MasTec common stock per $1,000 principal amount of notes, which represents an initial conversion price of approximately $15.76 per share, subject to customary anti-dilution adjustment terms for
these types of notes. Approximately $5.4 million in financing costs were incurred in connection with the issuance of these notes, which are included in other assets in the consolidated balance sheet and are being amortized over the term of the
notes. The proceeds from the 4% senior convertible notes were used to repay the $55 million 8% convertible note issued in connection with the Wanzek acquisition, convertible at $12.00 per share, as well as the outstanding balance on the Credit
Facility of approximately $20 million in June 2009. The remaining net proceeds were used for working capital, the acquisition of Precision and general corporate purposes.



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The 4.25% and 4.0% senior convertible notes are guaranteed by substantially all of the
Companys wholly-owned subsidiaries. There are no financial covenants under these notes, however, there are certain nonfinancial provisions and covenants associated with these notes. At December 31, 2010, the Company was in compliance with
all such provisions and covenants.

In January 2011, the Company completed a debt exchange offer related to its outstanding
4.0% senior convertible notes and 4.25% senior convertible notes (together, the Original Notes). For an exchange fee of 50 basis points, or 0.5% of the aggregate exchanged principal amount of Original Notes, the Company exchanged the
Original Notes tendered for a like principal amount of new 4.0% senior convertible notes or 4.25% senior convertible notes, as applicable (together, the New Notes), that are substantially similar to the Original Notes in all material
respects, except that the New Notes have an optional physical, cash or combination settlement feature and contain certain conditional conversion features. Upon completion of the exchange offer, $100.6 million of the original 4% senior convertible
notes and $97.0 million of the 4.25% senior convertible notes, or 87.5% and 97% of such notes, respectively, were canceled and exchanged for an identical principal amount of New Notes, plus exchange fees of approximately $1.0 million, which will be
treated as a component of interest expense and recognized over the remaining life of the New Notes. Approximately $0.5 million of transaction costs were recognized in connection with the exchange transaction within selling, general and
administrative expense in the consolidated income statement for the year ended December 31, 2010. Following the exchange offer, $14.4 million and $3.0 million of the original 4.0% and 4.25% notes, respectively, remain outstanding. The New Notes
are guaranteed by the Companys subsidiaries that guarantee the Original Notes.

Beginning in January 2011 upon the
issuance of the New Notes, the Company will bifurcate the principal balance of the New Notes between the fair value of the common stock conversion feature and the fair value of the New Notes. As a result, the value of the New Notes will be
discounted and the discount will be accreted to interest expense over the remaining term of the New Notes using the effective interest method. This will increase interest expense during the term of the New Notes above the 4.0% and 4.25% cash
coupon interest rates to an effective interest rate of approximately 6.7%. The fair value of the common stock conversion feature will be recorded as a component of stockholders equity. See Note 21 - Subsequent Events for additional
details.

Senior Notes

As of December 31, 2010, the Company had $150 million of outstanding 7.625% senior notes due February 2017, with interest due semi-annually. The notes contain default (including cross-default)
provisions and covenants restricting many of the same transactions as under the Companys Credit Facility. The indenture that governs the Companys senior notes allows the Company to incur additional indebtedness to the extent that the
Companys fixed charge coverage ratio, as therein defined, is at least 2:1. The fixed charge coverage ratio is calculated as consolidated EBITDA for the most recent four fiscal quarters for which internal financial statements are available,
divided by fixed charges for such four quarter period, as such terms are defined in the indenture. If the fixed charge coverage ratio is less than 2:1, the Company is still permitted to incur the following additional indebtedness, among others:
credit facilities under a defined threshold, renewals to existing debt permitted under the indenture, capital lease obligations up to 5% of the Companys consolidated net assets, plus an additional $50 million of indebtedness at any time the
senior notes remain outstanding. The senior notes are guaranteed by substantially all of the Companys operating subsidiaries. At December 31, 2010, the Company was in compliance with all the provisions and covenants of the senior notes.

Convertible Note

As described in Note 4 - Acquisitions and Joint Ventures, in connection with the Companys acquisition of Wanzek, MasTec issued an 8% convertible note in the principal amount of $55 million due
December 2013 with interest payments payable in April, August, and December of each year, commencing in April 2009 and convertible at the holders election at a conversion price of $12 per share. The 8% convertible note was repaid in June 2009
with the proceeds of the Companys 4% senior convertible notes.

Acquisition Debt

Pumpco

In connection with the acquisition of Pumpco, the Company entered into an equipment term loan in the aggregate amount of $22.5 million at
7.05% interest, payable in 60 monthly installments, maturing in 2013. The proceeds from this equipment term loan were used to pay off $8.7 million of Pumpco indebtedness, with the remaining balance funding a portion of the acquisition purchase
price. In October 2010, the Company repaid the $13.4 million outstanding principal balance of the 7.05% equipment term loan with the proceeds of a new loan in the amount of $13.5 million, bearing interest at 3.5267%. The 3.5267% equipment term loan
is payable in 36 monthly installments, maturing in 2013. The equipment term loan is secured by most of Pumpcos existing equipment and is guaranteed by MasTec. The Company also assumed approximately $9.5 million in notes payable for equipment
and capital lease obligations in connection with the acquisition of Pumpco.



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Nsoro

In connection with the acquisition of Nsoro, the Company assumed approximately $12 million in indebtedness, which was subsequently paid off during the third quarter of 2008.

Wanzek

In connection with the acquisition of Wanzek, the Company entered into an 8% convertible note in the principal amount of $55 million,
which was repaid in June 2009, and assumed approximately $15 million of Wanzeks debt.

Precision

The Company assumed approximately $34 million in indebtedness in connection with the acquisition of Precision for equipment debt and
capital lease obligations.

Except for one note with an immaterial principal balance at December 31, 2010, there are no
financial covenants associated with the acquisition debt described above.

Debt Guarantees

The subsidiary guarantees related to the Companys senior convertible notes and senior notes are full and unconditional and joint and
several, and there are generally no contractual restrictions on the Companys ability to obtain funds from its subsidiaries. Also, MasTec, Inc. is a holding company with no independent assets or operations, and the Companys subsidiaries
do not guarantee the senior convertible notes and senior notes are minor, individually, and in the aggregate, as such term is defined under the rules and regulations of the SEC. Accordingly, condensed consolidating financial information for MasTec,
Inc. and its subsidiaries is not presented.

Contractual Maturities of Debt Obligations

The following table summarizes the contractual maturities of MasTecs debt and capital lease obligations as of December 31, 2010
(in millions):



|           |  |   |       | 
|---------- |  | - | ----- | 
|2011       |  | $ | 18.4  | 
|2012       |  |   | 12.3  | 
|2013       |  |   | 11.8  | 
|2014       |  |   | 219.6 | 
|2015       |  |   | 0.5   | 
|Thereafter |  |   | 150.0 | 
|           |  |   |       | 
|Total      |  | $ | 412.6 | 
|           |  |   |       | 

Capital Leases

MasTec enters into agreements that provide financing for various machinery and equipment. Leases meeting certain criteria are capitalized, with the related asset being recorded in property and equipment
and an offsetting amount recorded as a liability. These capital leases are non-cash transactions and, accordingly, have been excluded from the consolidated statements of cash flows. As of December 31, 2010, MasTec had $24.5 million in total
indebtedness relating to the capital leases, of which $15.7 million was considered long-term.

Note 11 - Lease Commitments

MasTec has operating lease agreements for premises and equipment that expire on various dates. The operating lease agreements are subject
to escalation. Rent expense from continuing operations for the years ended December 31, 2010, 2009 and 2008 was approximately $132.9 million, $75.9 million and $57.6 million, respectively. MasTec also has capital lease agreements for equipment
that expire on various dates.



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Minimum future lease commitments under non-cancelable operating leases and capital lease
obligations, including the effect of escalation clauses in effect at December 31, 2010, were as follows (in millions):



|                                                                |  |                  |       |  |                |   |      |  
|--------------------------------------------------------------- |  | ---------------- | ----- |  | -------------- | - | ---- | -
|                                                                |  | Operating Leases |       |  | Capital Leases |  
|2011                                                            |  | $                | 31.0  |  |                | $ | 9.8  |  
|2012                                                            |  |                  | 26.8  |  |                |   | 5.6  |  
|2013                                                            |  |                  | 22.2  |  |                |   | 6.8  |  
|2014                                                            |  |                  | 11.9  |  |                |   | 4.2  |  
|2015                                                            |  |                  | 8.1   |  |                |   | 0.3  |  
|Thereafter                                                      |  |                  | 6.9   |  |                |   |     |  
|                                                                |  |                  |       |  |                |   |      |  
|Total minimum lease payments                                    |  | $                | 106.9 |  |                | $ | 26.7 |  
|                                                                |  |                  |       |  |                |   |      |  
|Less amounts representing interest                              |  |                  |       |  |                |   | (2.2 | )
|                                                                |  |                  |       |  |                |   |      |  
|Total capital lease obligations, net of interest                |  |                  |       |  |                | $ | 24.5 |  
|Less current portion                                            |  |                  |       |  |                |   | (8.8 | )
|                                                                |  |                  |       |  |                |   |      |  
|Long term portion of capital lease obligations, net of interest |  |                  |       |  |                | $ | 15.7 |  
|                                                                |  |                  |       |  |                |   |      |  

For operating leases with purchase options, the option to purchase equipment is at estimated fair market
value.

Note 12 - Stock-Based Compensation Plans

The Company has three stock-based compensation plans with stock options and restricted stock grants outstanding as of December 31, 2010: the 1994 Stock Option Plan for Non-Employee Directors (the
Directors Plan), the 2003 Employee Stock Incentive Plan as amended (the 2003 Plan) and the Amended and Restated 2003 Stock Incentive Plan for Non-Employees as amended (the 2003 Non-Employee Plan) and
individual option and restricted stock agreements. The 2003 Non-Employee Plan was adopted in April 2003 and authorized granting of restricted stock to non-employees. The Directors Plan expired in 2004 and no future stock options can be granted
under this plan. In addition, the 1997 Non-Qualified Employee Stock Purchase Plan allows eligible employees to purchase MasTecs common stock through payroll deductions or in a lump sum at a 15% discount from fair market value. The amount of
compensation expense related to these employee stock purchases is immaterial.

Under these plans, there were a total of
3,706,043 options and/or restricted shares available for grant at December 31, 2010. The total stock-based compensation expense recorded for the years ended December 31, 2010, 2009 and 2008 was $3.8 million, $3.0 million and $3.8 million,
respectively.

Stock Options

The Company has granted options to purchase its common stock to its employees and members of the Board of Directors and affiliates under various stock option plans at no less than the fair market value of
the underlying stock on the date of grant. These options are granted for a term not exceeding ten years, vest between one to five years after grant and are generally forfeited in the event the employee or director terminates his or her employment or
relationship with the Company or one of its affiliates. All option plans contain anti-dilutive provisions that require adjustment of the number of shares of common stock represented by each option for any stock splits or dividends. The Company uses
the Black-Scholes-Merton (Black-Scholes) option pricing model to determine the fair value of stock option awards. The Company has not granted any stock options since 2006.

The following is a summary of stock option transactions during the year ended December 31, 2010:



|                                      |  |              |           |   |                                |   |       |                                                  |  |  |                                                                      |  |  |   |      | 
|------------------------------------- |  | ------------ | --------- | - | ------------------------------ | - | ----- | ------------------------------------------------ |  |  | -------------------------------------------------------------------- |  |  | - | ---- | 
|                                      |  | StockOptions |           |   | Weighted AverageExercise Price |   |       | Weighted AverageRemainingContractual Life(years) |  |  | Aggregate IntrinsicValue
Unexercisedin-the-MoneyOptions(in millions) | 
|Options outstanding January 1, 2010   |  |              | 2,875,669 |   |                                | $ | 10.42 |                                                  |  |  | 4.93                                                                 |  |  | $ | 7.5  | 
|                                      |  |              |           |   |                                |   |       |                                                  |  |  |                                                                      |  |  |   |      | 
|Exercised                             |  |              | (231,599  | ) |                                |   | 11.23 |                                                  |  |  |                                                                      |  |  |   |      | 
|Canceled/forfeited                    |  |              | (55,900   | ) |                                |   | 13.94 |                                                  |  |  |                                                                      |  |  |   |      | 
|                                      |  |              |           |   |                                |   |       |                                                  |  |  |                                                                      |  |  |   |      | 
|Options outstanding December 31, 2010 |  |              | 2,588,170 |   |                                | $ | 10.27 |                                                  |  |  | 3.87                                                                 |  |  | $ | 11.2 | 
|                                      |  |              |           |   |                                |   |       |                                                  |  |  |                                                                      |  |  |   |      | 
|Options exercisable December 31, 2010 |  |              | 2,583,170 |   |                                | $ | 10.26 |                                                  |  |  | 3.87                                                                 |  |  | $ | 11.2 | 
|                                      |  |              |           |   |                                |   |       |                                                  |  |  |                                                                      |  |  |   |      | 



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As of December 31, 2010, all outstanding stock options were fully vested. The total
intrinsic value of options exercised during the years ended December 31, 2010, 2009 and 2008, which is based on the difference between the market price at the date of exercise and the strike price, was $0.8 million, $1.6 million and $2.7
million, respectively.

Restricted Stock

MasTec grants restricted stock, which is valued based on the market price of MasTec common stock on the date of grant. Compensation
expense arising from restricted stock grants with graded vesting is recognized using the ratable method (an accelerated method of expense recognition) over the vesting period. Those shares issued with cliff vesting are amortized on a straight line
basis over the vesting period. Through December 31, 2010, approximately 1,772,000 shares of restricted stock have been issued with a value of approximately $17.3 million, which is being expensed over vesting periods ranging from date of
issuance to five years. Total unearned compensation related to restricted stock grants as of December 31, 2010 is $4.2 million, which is expected to be recognized over a weighted-average period of 3 years. The total intrinsic value of
restricted shares vested during the years ended December 31, 2010, 2009 and 2008, which is based on the market price at grant date, was $1.1 million, $0.7 million and $0.8 million, respectively.



|                                               |  |                  |           |   |                                       |   |       | 
|---------------------------------------------- |  | ---------------- | --------- | - | ------------------------------------- | - | ----- | 
|                                               |  | RestrictedShares |           |   | Weighted AverageGrant Date Fair Value |  
|Non-vested restricted stock, January 1, 2010   |  |                  | 994,059   |   |                                       | $ | 9.00  | 
|                                               |  |                  |           |   |                                       |   |       | 
|Granted                                        |  |                  | 237,750   |   |                                       |   | 12.40 | 
|Vested                                         |  |                  | (89,926   | ) |                                       |   | 12.41 | 
|Forfeited                                      |  |                  | (63,958   | ) |                                       |   | 8.53  | 
|                                               |  |                  |           |   |                                       |   |       | 
|Non-vested restricted stock, December 31, 2010 |  |                  | 1,077,925 |   |                                       | $ | 9.49  | 
|                                               |  |                  |           |   |                                       |   |       | 

Note 13 - Retirement Plans

401(K) Plan.MasTec has a 401(k) plan covering all eligible employees. Subject to certain dollar limits, eligible employees may contribute up to 75% of their pre-tax annual compensation to
the 401(k) plan. MasTec matches 100% of the employees contribution up to 1% of the employees salary, payable quarterly in common shares of MasTec. During 2010, 2009 and 2008, MasTec made matching contributions of approximately $450,000,
$400,000 and $387,000, respectively.

Deferred Compensation Plan.In 2008, MasTec also began offering a deferred
compensation plan to its highly compensated employees. These employees are allowed to contribute a percentage of their pre-tax annual compensation to the deferred compensation plan. In addition, under the deferred compensation plan, MasTec matches
100% of the employees contribution up to 1% of the employees salary. MasTecs matching contribution is payable quarterly in common shares of MasTec stock. During 2010, 2009 and 2008, MasTec made matching contributions of $80,000,
$64,000 and $20,000, respectively. Deferred compensation plan assets of approximately $1.5 million and related liabilities of approximately $1.3 million are included, in other long-term assets and other long-term liabilities, respectively, in the
consolidated balance sheet as of December 31, 2010.

Multi-Employer Pension Plans.Certain of MasTecs
subsidiaries contribute amounts to multi-employer pension plans and employee benefit trusts. The multi-employer pension plan contribution rates are determined annually and assessed on a pay-as-you-go basis based on union employee
payrolls. Union payrolls cannot be determined for future periods because the number of union employees employed at any given time, and the plans in which they may participate, vary depending upon the location and number of ongoing projects at a
given time and the need for union resources in connection with those projects. During the years ended December 31, 2010, 2009 and 2008, total contributions to these plans, and the related number of employees covered by these plans ranged as
follows:



|                        |  |                    |     |  |                                                   |  |       |  |  |   |      | 
|----------------------- |  | ------------------ | --- |  | ------------------------------------------------- |  | ----- |  |  | - | ---- | 
|                        |  | Number ofEmployees |     |  | Contributions
toMulti-Employer Plans(in millions) | 
|Year ended December 31, |  | Low                |     |  | High                                              |  |      
|2010                    |  |                    | 254 |  |                                                   |  | 1,111 |  |  | $ | 22.4 | 
|2009                    |  |                    | 66  |  |                                                   |  | 1,409 |  |  | $ | 5.0  | 
|2008                    |  |                    | 70  |  |                                                   |  | 76    |  |  | $ | 0.6  | 

The average number of
employees covered under these plans increased in 2009 due to the acquisition of Precision in the fourth quarter of 2009. See Note 4 - Acquisitions and Joint Ventures.

See Note 16 - Commitments and Contingencies for additional information.



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Note 14 - Income Taxes

The provision (benefit) for income taxes from continuing operations consists of the following (in millions):



|                                             |  |      |      |  |      |   |     |      |  |   |      |  
|-------------------------------------------- |  | ---- | ---- |  | ---- | - | --- | ---- |  | - | ---- | -
|                                             |  | 2010 |      |  | 2009 |   |     | 2008 | 
|Current:                                     |  |      |      |  |      |   |     |      |  |   |      |  
|Federal                                      |  | $    | 3.3  |  |      | $ | 1.1 |      |  | $ | 0.1  |  
|Foreign                                      |  |      |     |  |      |   |    |      |  |   |     |  
|State and local                              |  | $    | 3.3  |  |      | $ | 1.0 |      |  | $ | 0.9  |  
|                                             |  |      |      |  |      |   |     |      |  |   |      |  
|                                             |  | $    | 6.6  |  |      | $ | 2.1 |      |  | $ | 1.0  |  
|                                             |  |      |      |  |      |   |     |      |  |   |      |  
|Deferred:                                    |  |      |      |  |      |   |     |      |  |   |      |  
|Federal                                      |  | $    | 54.7 |  |      | $ | 5.5 |      |  | $ | (0.1 | )
|Foreign                                      |  |      |     |  |      |   |    |      |  |   |     |  
|State and local, net of valuation provisions |  |      | 2.3  |  |      |   | 0.8 |      |  |   |     |  
|                                             |  |      |      |  |      |   |     |      |  |   |      |  
|                                             |  | $    | 57.0 |  |      | $ | 6.3 |      |  | $ | (0.1 | )
|                                             |  |      |      |  |      |   |     |      |  |   |      |  
|Provision for income taxes                   |  | $    | 63.6 |  |      | $ | 8.4 |      |  | $ | 0.9  |  
|                                             |  |      |      |  |      |   |     |      |  |   |      |  

The tax effects of significant items comprising the Companys net deferred tax asset as of
December 31, 2010 and 2009 are as follows (in millions):



|                                           |  |      |       |   |      |   |       |  
|------------------------------------------ |  | ---- | ----- | - | ---- | - | ----- | -
|                                           |  | 2010 |       |   | 2009 |  
|Current:                                   |  |      |       |   |      |   |       |  
|Deferred tax assets:                       |  |      |       |   |      |   |       |  
|Bad debts                                  |  | $    | 2.8   |   |      | $ | 3.4   |  
|Accrued self insurance                     |  |      | 4.2   |   |      |   | 3.5   |  
|Operating loss and tax credit carryforward |  |      | 8.6   |   |      |   | 50.8  |  
|Other                                      |  |      | 11.7  |   |      |   | 11.2  |  
|Valuation allowance                        |  |      | (2.8  | ) |      |   | (3.4  | )
|                                           |  |      |       |   |      |   |       |  
|Subtotal                                   |  | $    | 24.5  |   |      | $ | 65.5  |  
|Deferred tax liabilities:                  |  |      |       |   |      |   |       |  
|Accounts receivable retainage              |  | $    | 6.7   |   |      | $ | 5.4   |  
|Other                                      |  |      | 5.8   |   |      |   | 4.1   |  
|                                           |  |      |       |   |      |   |       |  
|Total deferred tax liabilities             |  | $    | 12.5  |   |      | $ | 9.5   |  
|                                           |  |      |       |   |      |   |       |  
|Net current deferred tax asset             |  | $    | 12.0  |   |      | $ | 56.0  |  
|                                           |  |      |       |   |      |   |       |  
|Noncurrent:                                |  |      |       |   |      |   |       |  
|Deferred tax assets:                       |  |      |       |   |      |   |       |  
|Non-compete                                |  | $    | 1.1   |   |      | $ | 1.2   |  
|Accrued self insurance                     |  |      | 9.9   |   |      |   | 8.2   |  
|Operating loss and tax credit carryforward |  |      | 5.6   |   |      |   | 7.2   |  
|Other                                      |  |      | 5.4   |   |      |   | 8.9   |  
|Valuation allowance                        |  |      | (2.8  | ) |      |   | (2.0  | )
|                                           |  |      |       |   |      |   |       |  
|Subtotal                                   |  | $    | 19.2  |   |      | $ | 23.5  |  
|                                           |  |      |       |   |      |   |       |  
|Deferred tax liabilities:                  |  |      |       |   |      |   |       |  
|Property and equipment                     |  | $    | 35.6  |   |      | $ | 28.4  |  
|Other                                      |  |      | 21.4  |   |      |   | 24.8  |  
|Goodwill                                   |  |      | 24.7  |   |      |   | 19.6  |  
|                                           |  |      |       |   |      |   |       |  
|Total deferred tax liabilities             |  | $    | 81.7  |   |      | $ | 72.8  |  
|                                           |  |      |       |   |      |   |       |  
|Net noncurrent deferred tax liability      |  | $    | (62.5 | ) |      | $ | (49.3 | )
|                                           |  |      |       |   |      |   |       |  
|Net deferred tax (liability) asset         |  | $    | (50.5 | ) |      | $ | 6.7   |  
|                                           |  |      |       |   |      |   |       |  

In assessing the ability to realize the deferred tax assets, management considers whether it is more likely
than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which these temporary differences
become deductible. Management considers the projected future taxable income and prudent and feasible tax planning strategies in making this assessment. As of December 31, 2010 and 2009, valuation allowances of $5.6 million and $5.4 million have
been recorded, respectively.



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A reconciliation of U.S. statutory federal income tax rate related to pretax income from
continuing operations to the effective tax rate for the years ended December 31 is as follows:



|                                                     |  |      |      |   |      |  |       |      |  |  |       |  
|---------------------------------------------------- |  | ---- | ---- | - | ---- |  | ----- | ---- |  |  | ----- | -
|                                                     |  | 2010 |      |   | 2009 |  |       | 2008 | 
|U.S. statutory federal rate applied to pretax income |  |      | 35.0 | % |      |  | 35.0  | %    |  |  | 35.0  | %
|State and local income taxes, net of federal benefit |  |      | 3.2  |   |      |  | 4.1   |      |  |  | 2.0   |  
|Non-deductible expenses                              |  |      | 2.9  |   |      |  | 1.5   |      |  |  | 2.0   |  
|Change in state tax rate                             |  |      | (0.8 | ) |      |  | 0.5   |      |  |  |      |  
|Other                                                |  |      | 0.9  |   |      |  | 0.2   |      |  |  | (0.8  | )
|Valuation allowance for deferred tax assets          |  |      | 0.1  |   |      |  | (30.7 | )    |  |  | (36.9 | )
|                                                     |  |      |      |   |      |  |       |      |  |  |       |  
|Effective income tax rate                            |  |      | 41.3 | % |      |  | 10.6  | %    |  |  | 1.3   | %
|                                                     |  |      |      |   |      |  |       |      |  |  |       |  

An entity may only recognize or continue to recognize tax positions that meet a more likely than
not threshold. In the ordinary course of business, there is inherent uncertainty in quantifying income tax positions. The Company assesses its income tax positions and records tax benefits for all years subject to examination based on
managements evaluation of the facts, circumstances and information available at the reporting date. For those tax positions where it is more likely than not that a tax benefit will be sustained, the Company has recognized the largest amount of
tax benefit with a greater than 50% likelihood of being realized upon ultimate settlement with a taxing authority that has full knowledge of all relevant information. For those income tax positions where it is not more likely than not that a tax
benefit will be sustained, no tax benefit has been recognized in the Companys financial statements. Management believes that the Company has not taken material tax positions that would be deemed to be uncertain, therefore, the
Company has not established a liability for uncertain positions for the year ended December 31, 2010.

Note 15 - Operations by
Geographic Areas and Segments

MasTec manages its business on a project basis and the Company operates in one reportable
segment as a specialty trade contractor. MasTec provides services to its customers in the communications, utilities and government industries. These services are provided by MasTecs various subsidiaries throughout the United States and all of
the Companys subsidiaries have been aggregated into one reporting segment due to their similar economic characteristics, processes, service offerings and customers.

Revenue for customers by industry for the periods indicated is as follows (in millions):



|               |  |                         |         |  |      |  |     |      |  |   |         |  |  |  |     |   |  |   |         |  |  |  |     |  
|-------------- |  | ----------------------- | ------- |  | ---- |  | --- | ---- |  | - | ------- |  |  |  | --- | - |  | - | ------- |  |  |  | --- | -
|               |  | Year Ended December 31, |        
|               |  | 2010                    |         |  | 2009 |  |     | 2008 | 
|Communications |  | $                       | 1,222.1 |  |      |  | 53  | %    |  | $ | 951.2   |  |  |  | 59  | % |  | $ | 860.0   |  |  |  | 62  | %
|Utilities      |  |                         | 1,046.2 |  |      |  | 45  | %    |  |   | 595.3   |  |  |  | 37  | % |  |   | 442.3   |  |  |  | 32  | %
|Government     |  |                         | 39.7    |  |      |  | 2   | %    |  |   | 77.0    |  |  |  | 4   | % |  |   | 76.4    |  |  |  | 6   | %
|               |  |                         |         |  |      |  |     |      |  |   |         |  |  |  |     |   |  |   |         |  |  |  |     |  
|               |  | $                       | 2,308.0 |  |      |  | 100 | %    |  | $ | 1,623.5 |  |  |  | 100 | % |  | $ | 1,378.7 |  |  |  | 100 | %
|               |  |                         |         |  |      |  |     |      |  |   |         |  |  |  |     |   |  |   |         |  |  |  |     |  

The Company does not have significant operations or long-lived assets in countries outside of the
United States. During 2010 and 2009, $2.8 million and $5.1 million, respectively, of revenues were derived from foreign operations, the majority of which were earned in Latin America and the Caribbean. Foreign revenues during 2008 were
immaterial. In addition, the Company held property and equipment of $1.4 million and $0.3 million, respectively, in foreign countries as of December 31, 2010 and 2009.

Note 16 - Commitments and Contingencies

Legacy Litigation.MasTec is subject to
litigation, some of which dates from the period from 2001 through 2006.

Resolved Legacy Litigation

MasTec filed a lawsuit against Consolidated Edison, Inc., Consolidated Edison Company of New York, Inc. and Con Edison Communications,
Inc. (collectively, Con Edison) in May 2002 in connection with a telecommunication project MasTec worked on for Telergy, Inc. (Telergy). The lawsuit alleged that Con Edison directly interfered with MasTecs work for
Telergy and that this interference resulted in Telergys bankruptcy and resulted in Con Edison obtaining MasTecs work on the Telergy project without paying for it. The matter was settled in December 2009 with the parties releasing each
other from liability, and Con Edison agreeing



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to pay MasTec $6 million, of which $3 million was paid in December 2009. The $3 million remaining is due in December 2014 but it shall be reduced by a certain percentage of any payments received
by MasTec for services it performs for Con Edison. MasTec recorded a gain of $2.0 million, net of legal fees, in 2009 in connection with the settlement.

During 2003, MasTec contracted to construct a natural gas pipeline for Coos County, Oregon (Coos County). In February 2004 MasTec sued Coos County and Coos County subsequently counterclaimed.
In April 2008, MasTec entered into a settlement agreement to settle its dispute with Coos County, which provided for $8.7 million in payments to Coos County, which was paid in two installments in March and June of 2009. The settlement agreement was
subject to MasTec not being penalized greater than $1.5 million in the Corps of Engineers case. In February 2009, the Federal District Court entered a judgment in favor of the Corps of Engineers in the amount of $1.5 million thus making the
settlement effective.

In March 2006, the United States Army Corps of Engineers (Corps of Engineers) brought
a complaint in a federal district court against MasTec for environmental violations in connection with the above referenced project in Coos County and sought damages in excess of $16 million. The matter went to trial in February 2008, and
in February 2009, the Federal District Court entered a judgment in favor of the Corps of Engineers in the amount of $1.5 million. The Corps of Engineers filed a notice of appeal but subsequently dismissed its appeal in September 2009. The
judgment was paid in January 2010.

Outstanding Legacy Litigation

The Company is vigorously pursuing claims in excess of $5 million against Aon Risk Services, Inc. of Florida, an insurance broker, for
breach of contract and breach of fiduciary duty for the losses arising from a denial of insurance coverage. Discovery is ongoing.

MasTec provided telecommunication infrastructure services to Adesta Communications, Inc. (Adesta) in 2000 and 2001. Adesta filed for bankruptcy in 2001. Adestas bankruptcy trustee sold
Adestas assets in the trust, and MasTec is waiting for a distribution from that trust. Based on MasTecs current understanding of the expected distribution, MasTec has reduced its receivable to approximately $0.9 million, which is
recorded in other current assets on its consolidated balance sheet at December 31, 2010.

The labor union representing
the workers of Sistemas e Instalaciones de Telecomunicación S.A. (Sintel), a former MasTec subsidiary that was sold in 1998, filed a claim that initiated an investigative action with the Audiencia Nacional, a Spanish federal
court, against Telefonica and dozens of other defendants including current and former officers and directors of MasTec (including Jorge Mas, Chairman of the Companys Board of Directors) relating to Sintels 2000 bankruptcy. The union
alleged Sintel and its creditors were damaged in the approximate amount of 300 million euros (approximately $398 million as of December 31, 2010). In June 2009, the Audiencia Nacional issued an order that the trial phase was commencing
against the MasTec defendants and other defendants. In June 2010, the investigative court issued an order for letters rogatory to the United States for assistance in obtaining evidence from and seizing the assets of the MasTec defendants and MasTec.
The Company believes that the order violates U.S. and international law and is opposing the order. MasTec and the MasTec defendants believe the claims are frivolous and are vigorously defending the matter. MasTec will vigorously defend any potential
liability. Neither MasTec nor Jorge Mas were directly involved in any of the transactions the Spanish prosecutor alleges led to Sintels bankruptcy. MasTecs directors and officers insurance carrier has agreed to fund legal
expenses under a reservation of rights. The amount of loss to MasTec, if any, relating to this matter cannot presently be determined.

In addition to the matters discussed above, MasTec is subject to a variety of legal cases, claims and other disputes that arise from time to time in the ordinary course of its business. MasTec cannot
provide assurance that it will be successful in recovering all or any of the potential damages it has claimed or in defending claims against it.

Resolved Litigation

As previously disclosed, in July 2008, the
Company filed a claim in arbitration against its investment advisor (Investment Advisor) with the Financial Industry Regulatory Authority, Inc. (FINRA) for negligence, unsuitability, negligent supervision, negligent
misrepresentations and omissions of material fact, breach of fiduciary duty, breach of contract and violations of state securities laws in connection with the sale by the Investment Advisor to the Company of certain auction rate securities in the
aggregate principal amount of $33.7 million. The Company sought, among other relief, rescission of the purchase of the auction rate securities and the Investment Advisors denied the Companys claims. The matter was settled in October 2009
with a mutual release from liability, the Investment Advisor paying the Company $7 million, before legal expenses, which was recorded in other income, and the Company keeping the auction rate securities.



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Accrued aggregate liabilities related to the matters described above and other litigation
matters amounted to $2.4 million at December 31, 2010 and $2.2 million at December 31, 2009.

Other Commitments and
Contingencies

Performance and Payment Bonds.MasTec is required to provide payment and performance bonds for
some of the Companys contractual commitments related to projects in process. At December 31, 2010, the cost to complete projects secured by the Companys $520.0 million in performance and payment bonds was $93.9 million.

Included in the outstanding performance and payment bonds at December 31, 2010 was $3.0 million relating to the projects and assets
of the state Department of Transportation business sold in 2007. In connection with the sale of these assets, MasTec remains contingently liable for certain obligations, including liabilities associated with claims on these performance and payment
bonds. The buyer of the Department of Transportation related projects and assets filed for bankruptcy protection in October 2009, which increases the likelihood that MasTec will be required to assume certain obligations associated with these
projects. As of December 31, 2010, MasTec estimates that the remaining cost to complete these state Department of Transportation projects was $0.1 million.

Collective Bargaining Agreements.Certain of MasTecs subsidiaries are party to various collective bargaining agreements with unions representing certain of their employees. The
agreements require the subsidiaries party to the agreements to pay specified wages, provide certain benefits to their union employees and contribute certain amounts to multi-employer pension plans and employee benefit trusts. The multi-employer
pension plan contribution rates are determined annually and assessed on a pay-as-you-go basis based on union employee payrolls. The required amount of future contributions cannot be determined for future periods because the number of
union employees employed at any given time and the plans in which they may participate vary depending upon the location and number of ongoing projects at a given time and the need for union resources in connection with those projects. The collective
bargaining agreements expire at various times and have typically been renegotiated and renewed on terms similar to the ones contained in the expiring agreements.

The Employee Retirement Income Security Act of 1974, as amended by the Multi-Employer Pension Plan Amendments Act of 1980, imposes certain liabilities upon employers who are contributors to a
multi-employer plan in the event of the employers withdrawal from, or upon termination of, such plan. In the event of a complete or partial withdrawal from any of these plans, or if the plans were to otherwise become underfunded, the
subsidiaries (and potentially MasTec itself) could be assessed liabilities for the withdrawal or for additional contributions related to the underfunding of these plans. None of the subsidiaries party to the agreements have any current plans to
withdraw from the plans. The Pension Protection Act of 2006 also added new funding rules generally applicable to plan years beginning after 2007 for multi-employer plans that are classified as endangered, seriously
endangered, or critical status. For a plan in critical status, additional required contributions and benefit reductions may apply. The Company has been notified that certain plans to which a MasTec subsidiary contributes are in
critical status and require additional contributions in the form of a surcharge on future benefit contributions required for future work performed by union employees covered by these plans. The amount of additional funds MasTec may be
obligated to contribute in the future cannot be estimated, as such amounts will be based on future levels of work that require the specific use of those union employees covered by these plans.

Other Guarantees.In the ordinary course of its business, from time to time, MasTec guarantees the obligations of its
subsidiaries, including obligations under certain contracts with customers, certain lease obligations and in some states, obligations in connection with obtaining contractors licenses. MasTec also generally warrants the work it performs for a
one to two year period following substantial completion of a project. MasTec has not historically accrued any reserves for potential warranty claims as they have been immaterial. MasTec also generally indemnifies its customers for the services it
provides under its contracts, as well as other specified liabilities, which may subject MasTec to indemnity claims, liabilities and related litigation. As of December 31, 2010, MasTec is not aware of any asserted claims against it for material
amounts in connection with these indemnity obligations.

Note 17 - Concentrations of Risk

The Company is subject to certain risk factors, including, but not limited to: risks related to economic downturns, technological and
regulatory changes in the industries it serves; competition within its industry; the nature of its contracts, which do not obligate MasTecs customers to undertake any infrastructure projects and may be canceled on short notice; collectibility
of receivables; acquisition integration and financing; seasonality; availability of qualified employees; recoverability of goodwill; potential exposures to environmental liabilities; and exposure to multi-employer pension plan liabilities.



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The Company has approximately 320 customers as of December 31, 2010, which include some
of the largest and most prominent companies in the communications, utilities and government industries. MasTecs customers include public and private energy providers, pipeline operators, wireless service providers, satellite and broadband
operators, incumbent local exchange carriers, long distance carriers, financial institutions and government entities. The industries served by MasTecs customers include, among others: utilities (including wind farms, solar farms and other
renewable energy, natural gas gathering systems and pipeline infrastructure), communications (including wired and wireless telephony and satellite television) and government (including water, sewer and other utility and communications work on
military bases).

The Company grants credit, generally without collateral, to its customers. Consequently, the Company is
subject to potential credit risk related to changes in business and economic factors. However, MasTec generally has certain lien rights on that work and concentration of credit risk is limited due to the diversity of the customer base. The Company
believes its billing and collection policies are adequate to minimize potential credit risk.

Revenue concentration
information, as a percent of total consolidated revenue, is as follows:



|                                 |  |      |    |   |      |  |    |      |  |  |    |  
|-------------------------------- |  | ---- | -- | - | ---- |  | -- | ---- |  |  | -- | -
|                                 |  | 2010 |    |   | 2009 |  |    | 2008 | 
|Revenue from top ten customers   |  |      | 72 | % |      |  | 72 | %    |  |  | 72 | %
|Revenue from specific customers: |  |      |    |   |      |  |    |      |  |  |    |  
|DIRECTV®                         |  |      | 24 | % |      |  | 30 | %    |  |  | 34 | %
|AT&T                             |  |      | 20 | % |      |  | 16 | %    |  |  | 12 | %

Note 18 - Related Party Transactions

MasTec purchases, rents and leases equipment used in its business from a number of different vendors on a non-exclusive
basis, including Neff Corp. (Neff). Juan Carlos Mas, who was the chairman of the Neff Board of Directors through September 30, 2010, is the brother of Jorge Mas, Chairman of MasTecs Board of Directors, and Jose Mas,
MasTecs Chief Executive Officer. For the years ended December 31, 2010, 2009 and 2008, MasTec paid Neff approximately $1,045,000, $920,000 and $811,000, respectively, for equipment purchases, rentals and leases. MasTec believes the amount
paid to Neff is equivalent to the payments that would have been made between unrelated parties for similar transactions acting at arms length. As of October 1, 2010, Juan Carlos Mas is no longer the chairman of the Neff Board of
Directors.

MasTec leases a property located in Florida from Irma S. Mas, the mother of Jorge Mas and Jose Mas. For the years
ended December 31, 2010, 2009 and 2008, the Company paid approximately $48,000 for lease payments in connection with this property.

MasTec has an arrangement with a customer whereby it leases employees to that customer. During the years ended December 31, 2010, 2009 and 2008, MasTec charged approximately $463,000, $426,000 and
$390,000, respectively, to the customer. As of December 31, 2010 and 2009, $887,000 and $832,000 respectively, is included as accounts receivable within other current assets from this customer. The Company also has an agreement with the
customer whereby the Company provides satellite communication services. During the years ended December 31, 2010, 2009 and 2008, revenues relating to this customer were approximately $979,000, $887,000 and $583,000, respectively. Jorge Mas and
Jose Mas are minority owners of this customer. As of December 31, 2010 and 2009, approximately $599,000 and $445,000, respectively, is included as trade accounts receivable from this customer.

The Company charters an aircraft from a third party which leases two of its aircraft from entities in which Jorge Mas and Jose Mas have
an ownership interest. MasTec paid this unrelated chartering company approximately $560,000, $475,000 and $341,000 during years ended December 31, 2010, 2009 and 2008, respectively.

On October 28, 2009, MasTec combined the three existing split dollar agreements it had entered into with Jorge Mas into a restated
single split dollar agreement. Under the amended and restated split dollar agreement, MasTec is the sole owner and beneficiary of each of the policies subject to the agreement and upon the death of the insured or insureds under the applicable
policy, MasTec is entitled to receive a portion of the death benefit under such policy equal to the greater of (i) the total premiums paid by MasTec on such policy, or (ii) the then cash value of such policy immediately before the death of
the insured or insureds, excluding surrender charges. Upon termination of the agreement, Jorge Mas, or in the case of a second to die policy, the second to die of Jorge Mas and his wife have an option to purchase each policy subject to the agreement
for a purchase price equal to the greater of the amounts referenced above. The total maximum face amount of the insurance for all policies subject to the split dollar agreement was capped at $200 million. MasTec will make the premium payments until
the agreement is terminated, which occurs upon any of the



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following events: (i) bankruptcy or dissolution of MasTec, or (ii) a change in control of MasTec. In connection with the split dollar agreements for Jorge Mas, MasTec paid approximately
$284,000, $568,000 and $1,107,000 for the years ended December 31, 2010, 2009 and 2008, respectively.

On
October 28, 2009, MasTec amended and restated an existing deferred bonus agreement it had entered into with Jorge Mas. The deferred bonus under the new agreement is equal to the sum of the following amounts, determined with respect to each
policy subject to the split dollar agreement: the greater of (i) the total premiums paid by MasTec under such policy, or (ii) the then cash value of such policy immediately prior to the change in control, excluding surrender charges.

On October 28, 2009, the split dollar and deferred bonus agreements between Jose Mas and MasTec were amended and
restated in their entirety. The amended and restated split dollar agreement provides that one or more life insurance policies may be subject to the agreement. At this time, however, the only policy subject to the agreement is the one acquired
pursuant to the original agreement, which is in an aggregate face amount of $11 million. MasTec is the sole owner and beneficiary of any policy subject to the agreement, and upon the death of the insured, MasTec is entitled to receive a portion of
the death benefit equal to the greater of (i) the total premiums paid by MasTec on such policy, or (ii) the then cash value of such policy immediately before the death of the insured, excluding surrender charges. Upon termination of the
agreement, Jose Mas has an option to purchase each policy, subject to the agreement for a purchase price equal to the greater of the amounts referenced above. MasTec will make the premium payments until the agreement is terminated, which occurs upon
any of the following events: (i) bankruptcy or dissolution of MasTec, or (ii) a change in control of MasTec. For the years ended December 31, 2010, 2009 and 2008, MasTec paid approximately $115,000, $150,000 and $0, respectively, in
connection with the split dollar agreements for Jose Mas.

The amount of the deferred bonus under the amended and restated
deferred bonus agreement that is payable upon termination of the split dollar agreement is equal to the sum of the following amounts, determined with respect to each policy subject to the split dollar agreement: the greater of (i) the total
premiums paid by MasTec under the terms of such policy, or (ii) the then cash value of such policy immediately prior to the change in control, excluding surrender charges.

The Company adjusts the value of the policies each period based on their current cash surrender value. The estimated fair value of these
policies of $8.3 million and $8.1 million at December 31, 2010 and 2009, respectively, is included in other assets in the consolidated balance sheets.

Note 19 - Discontinued Operations

Canadian Operations. In
March 2007, the Companys Board of Directors voted to sell substantially all of MasTecs Canadian operations. No activity was recorded in the years ended December 31, 2010 or 2009. The following table summarizes the results of the
discontinued Canadian operations for the year ended December 31, 2008 (in millions).



|                                                     |  |      |      |  
|---------------------------------------------------- |  | ---- | ---- | -
|                                                     |  | 2008 |     
|Revenue                                              |  | $    |     |  
|Cost of revenue                                      |  |      |     |  
|Operating and other expenses                         |  |      | (0.8 | )
|                                                     |  |      |      |  
|Loss from operations before benefit for income taxes |  |      | (0.8 | )
|Benefit for income taxes                             |  |      |     |  
|                                                     |  |      |      |  
|Net loss                                             |  | $    | (0.8 | )
|                                                     |  |      |      |  

Department of Transportation Projects and Assets. Effective February 2007, the Company sold
the state Department of Transportation related projects and net assets. As a result of this sale, the Company recorded impairment charges totaling $2.9 million during the year ended December 31, 2007. On January 24, 2008, the Company
entered into a settlement with the buyer of its state Department of Transportation projects and assets to settle previously disclosed warranty, indemnification and other claims primarily relating to work the Company had performed on the projects
which were sold. Under the terms of the Settlement Agreement, the Company paid $6 million in cash and obtained a covenant not to sue and general release from nearly all obligations owed by the Company to the buyer under the purchase agreement
including warranty and other indemnification obligations. As a result of the settlement, the Company recorded a charge of $6 million reflected in its loss from discontinued operations for the year ended December 31, 2007. In October 2009, the
buyer filed for bankruptcy protection. No material activity was recorded in the years ended December 31, 2010, 2009 or 2008.



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Note 20 - Quarterly Information (Unaudited)

The following table presents unaudited quarterly operating results for the years ended December 31, 2010 and 2009 (in thousands,
except per share data). The Company believes that all necessary adjustments have been included in the amounts stated below to present fairly the quarterly results when read in conjunction with the consolidated financial statements and notes for the
years ended December 31, 2010 and 2009 (in thousands, except per share data). Note that due to rounding differences and changes in the composition of dilutive instruments included in the Companys diluted share count under the
if-converted method during the years ended December 31, 2010 and 2009, the sum of the Companys quarterly earnings per share in a given year may not be the same as the Companys year to date earnings per share for the same
period. See Note 3 - Earnings per Share.



|                                                    |  |                    |         |  |                    |   |         |        |  |   |         |  |  |        |         |  |        |   |         |        |  |   |         |  |  |   |         |  |  |   |         | 
|--------------------------------------------------- |  | ------------------ | ------- |  | ------------------ | - | ------- | ------ |  | - | ------- |  |  | ------ | ------- |  | ------ | - | ------- | ------ |  | - | ------- |  |  | - | ------- |  |  | - | ------- | 
|                                                    |  | 2010 Quarter Ended |         |  | 2009 Quarter Ended |  
|                                                    |  | Mar 31             |         |  | Jun 30             |   |         | Sep 30 |  |   | Dec 31  |  |  | Mar 31 |         |  | Jun 30 |   |         | Sep 30 |  |   | Dec 31  | 
|Revenue                                             |  | $                  | 450,231 |  |                    | $ | 495,113 |        |  | $ | 631,947 |  |  | $      | 730,740 |  |        | $ | 342,119 |        |  | $ | 387,854 |  |  | $ | 397,248 |  |  | $ | 496,281 | 
|Net income attributable to MasTec                   |  | $                  | 7,411   |  |                    | $ | 14,601  |        |  | $ | 30,006  |  |  | $      | 38,510  |  |        | $ | 11,929  |        |  | $ | 18,991  |  |  | $ | 21,644  |  |  | $ | 18,183  | 
|                                                    |  |                    |         |  |                    |   |         |        |  |   |         |  |  |        |         |  |        |   |         |        |  |   |         |  |  |   |         |  |  |   |         | 
|Basic net income per share attributable to MasTec   |  | $                  | 0.10    |  |                    | $ | 0.19    |        |  | $ | 0.39    |  |  | $      | 0.50    |  |        | $ | 0.16    |        |  | $ | 0.25    |  |  | $ | 0.29    |  |  | $ | 0.24    | 
|                                                    |  |                    |         |  |                    |   |         |        |  |   |         |  |  |        |         |  |        |   |         |        |  |   |         |  |  |   |         |  |  |   |         | 
|Diluted net income per share attributable to MasTec |  | $                  | 0.10    |  |                    | $ | 0.18    |        |  | $ | 0.35    |  |  | $      | 0.44    |  |        | $ | 0.16    |        |  | $ | 0.25    |  |  | $ | 0.27    |  |  | $ | 0.22    | 
|                                                    |  |                    |         |  |                    |   |         |        |  |   |         |  |  |        |         |  |        |   |         |        |  |   |         |  |  |   |         |  |  |   |         | 

See Note 4 - Acquisitions and Joint Ventures for a discussion of acquisition and joint venture activity
during the years ended December 31, 2010 and 2009.

Note 21 - Subsequent Events

In February 2011, the Company amended its purchase option agreement with Red Ventures. The amended and restated option agreement grants to
Red Ventures an option to purchase the DirectStar Business from MasTec at any time from March 1, 2012 to November 30, 2012, for an amount equal to the sum of: (i) the shareholders equity of the DirectStar Business as of
May 31, 2010, (ii) five percent (5%) of adjusted net income (generally, the net income (loss) before provision for income taxes) of the DirectStar Business from January 1, 2010 until the last day of the month immediately prior to
the date of the sale and (iii) $25,600,000. See Note 4 - Acquisitions and Joint Ventures.

In January 2011, the Company
completed a debt exchange offer related to its outstanding 4.0% senior convertible notes and 4.25% senior convertible notes (together, the Original Notes). For an exchange fee of 50 basis points, or 0.5% of the aggregate exchanged
principal amount of Original Notes, the Company exchanged the Original Notes tendered for a like principal amount of new 4.0% senior convertible notes or 4.25% senior convertible notes, as applicable, (together, the New Notes), that are
substantially similar to the Original Notes in all material respects, except that the New Notes have an optional physical, cash or combination settlement feature and contain certain conditional conversion features. Upon completion of the exchange
offer, $100.6 million of the original 4% senior convertible notes and $97.0 million of the 4.25% senior convertible notes, or 87.5% and 97% of such notes, respectively, were canceled and exchanged for an identical principal amount of New Notes, plus
exchange fees of approximately $1.0 million, which will be treated as a component of interest expense and recognized over the remaining life of the New Notes. Approximately $0.5 million of transaction costs were recognized in connection with the
exchange transaction within selling, general and administrative expense in the consolidated income statement for the year ended December 31, 2010. Following the exchange offer, $14.4 million and $3.0 million of the original 4.0% and 4.25%
notes, respectively, remain outstanding.

The terms of the New Notes are substantially similar to the Original Notes, except
for certain features primarily related to the conversion of the New Notes, including: a net settlement feature which provides that, upon conversion of the New Notes, the Company will pay or deliver, as the case may be, cash, shares of MasTecs
common stock or a combination thereof; and conditional conversion features, which provide that the New Notes may be converted only upon certain specified conditions, among other differences as described in the prospectus filed with the SEC on
January 6, 2011 pursuant to Rule 424(b)(3) under the Securities Act of 1933, as amended. Because the New Notes have an optional cash settlement feature and management intends to settle the principal amount in cash, the shares underlying the
principal amount of the New Notes will not be included in the Companys diluted share count in the future. If, however, the average stock price per share exceeds the $15.76 conversion price for the new 4.0% notes or the $15.48 conversion price
for the new 4.25% notes, then the resulting amount, in shares, of any premium will be included in the Companys diluted share count.



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In connection with the exchange offer, the Company entered into an amendment to its Credit
Facility, pursuant to which the lenders consented to the exchange offer and issuance of the New Notes in connection with the exchange offer, subject to, among other things, the condition that, prior to the expiration of the Credit Facility in May
2013, the Company may not use more than $10 million in the aggregate from cash on hand to defease, redeem or settle conversions of the New Notes, without prior consent of the lenders under the Credit Facility. The New Notes are guaranteed by the
Companys subsidiaries that guarantee the Original Notes.



|Item 9. | CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE
|------- | ------------------------------------------------------------------------------------

None



|Item 9A. | CONTROLS AND PROCEDURES
|-------- | -----------------------

Evaluation of Disclosure Controls and Procedures. As of the end of the period covered by this Annual Report on Form 10-K, we
carried out an evaluation, under the supervision and with the participation of our management, including our Chief Executive Officer and our Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and
procedures (as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934, as amended (the Exchange Act). We maintain disclosure controls and procedures designed to ensure that information required to be disclosed in
reports filed under the Exchange Act is recorded, processed, summarized and reported within specified time periods. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required
to be disclosed by us in the reports that we file or submit under the Exchange Act is accumulated and communicated to management, including our Chief Executive Officer and Chief Financial Officer, or persons performing similar functions, as
appropriate to allow timely decisions regarding required disclosure.

Our management has designed our disclosure controls and
procedures to provide reasonable assurance of achieving our control objectives. In designing and evaluating our disclosure controls and procedures, our management recognizes that any controls and procedures, no matter how well designed
and operated, can provide only reasonable assurance of achieving the desired control objectives and are subject to certain limitations, including the exercise of judgment by individuals, the difficulty in identifying unlikely future events, and the
difficulty in eliminating misconduct completely.

In connection with this annual report on Form 10-K, our Chief Executive
Officer and Chief Financial Officer evaluated, with the participation of our management, the effectiveness of our disclosure controls and procedures as of the end of the period covered by this report. Based on managements evaluation, our Chief
Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures were effective at the reasonable assurance level as of December 31, 2010.

Managements Report on Internal Control Over Financial Reporting. Our management is responsible for establishing and
maintaining adequate internal control over financial reporting, as such term is defined in Exchange Act Rules 13a-15(f). Under the supervision and with the participation of our management, including our principal executive officer and principal
financial officer, we conducted an evaluation of the effectiveness of our internal control over financial reporting based on the framework in Internal Control - Integrated Frameworkissued by the Committee of Sponsoring Organizations of the
Treadway Commission. Our internal control over financial reporting is designed to provide reasonable assurance to management and to our Board of Directors regarding the reliability of financial reporting and the preparation and fair presentation of
financial statements for external purposes in accordance with generally accepted accounting principles. MasTecs internal control over financial reporting includes those policies and procedures that:

(i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and
dispositions of our assets;

(ii) provide reasonable assurance that transactions are recorded as necessary to permit
preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures are being made only in accordance with authorizations of management and directors of MasTec; and

(iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of our
assets that could have a material effect on the financial statements.



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##### Table of Contents

In connection with this annual report on Form 10-K, management, including our Chief
Executive Officer and Chief Financial Officer, evaluated the effectiveness of the Companys internal control over financial reporting as of the end of the period covered by this report. In making its assessment of the effectiveness of internal
control, management used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control-Integrated Framework. Based on managements evaluation and the criteria set forth by COSO, our
Chief Executive Officer, Chief Financial Officer and management concluded that our internal control over financial reporting was effective as of December 31, 2010.

BDO USA, LLP, the independent registered public accounting firm which audits our financial statements, has audited our internal control over financial reporting as of December 31, 2010 and has
expressed an unqualified opinion thereon.

Changes in Internal Controls over Financial Reporting. There have
been no changes in the Companys internal control over financial reporting during the quarter ended December 31, 2010 that have materially affected, or are reasonably likely to materially affect, the Companys internal control over
financial reporting.

Report of Independent Registered Public Accounting Firm

Board of Directors and Shareholders

MasTec, Inc.

Coral Gables, Florida

We have audited MasTec,
Inc.s internal control over financial reporting as of December 31, 2010, based on criteria established in Internal Control - Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (the
COSO criteria). MasTec, Inc.s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying
Managements Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the companys internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we
plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial
reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audit also included performing such other procedures as we
considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A companys internal
control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted
accounting principles. A companys internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions
and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that
receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized
acquisition, use, or disposition of the companys assets that could have a material effect on the financial statements.

Because of its
inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of
changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, MasTec, Inc.
maintained, in all material respects, effective internal control over financial reporting as of December 31, 2010, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of MasTec, Inc. as of December 31, 2010 and
2009, and the related consolidated statements of operations, shareholders equity, and cash flows for each of the three years in the period ended December 31, 2010 and our report dated February 23, 2011, expressed an unqualified
opinion thereon.



|                            
|----------------------------
|/s/ BDO USA, LLP            
|Certified Public Accountants
|Miami, Florida              
|February 23, 2011           



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|ITEM 9B. | OTHER INFORMATION
|-------- | -----------------

None.

PART III



|ITEM 10. | DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE
|-------- | ------------------------------------------------------

The information about directors required for this item is incorporated by reference from our Proxy Statement to be filed in connection with our 2011 Annual Meeting of Shareholders.

We have adopted a code of ethics that applies to our principal officer, principal financial officer, principal accounting officer, or
persons performing similar functions. We have posted our code of ethics on our website (www.mastec.com) as Appendix E to the MasTec Personal Responsibility Code, and it is available to any shareholder upon request. We intend to post any
amendments to, or any waivers from, a provision of the code of ethics that applies to the principal executive officer, principal financial officer, principal accounting officer or controller, or any other person performing a similar function, on our
website. See also, Item 1. Business - Available Information.



|ITEM 11. | EXECUTIVE COMPENSATION
|-------- | ----------------------

The information required for this item is incorporated by reference from our Proxy Statement to be filed in connection with our 2011
Annual Meeting of Shareholders.



|ITEM 12. | SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS
|-------- | ----------------------------------------------------------------------------------------------

During the year ended December 31, 2010, there were no stock options awarded. The following table sets forth information about our
common stock that may be issued under all of our existing equity compensation plans as of December 31, 2010, which include: the 1997 Non-Qualified Employee Stock Purchase Plan; the 2003 Employee Stock Incentive Plan; the Amended and Restated
2003 Stock Incentive Plan for Non-Employees; and individual option agreements. The 2003 Employee Stock Incentive Plan and the Amended and Restated 2003 Stock Incentive Plan for Non-Employees were approved by our shareholders.



|                                                           |  |                                                                                          |           |     |                                                                          |   |       |                                                                                                                                         |  |  |           |    
|---------------------------------------------------------- |  | ---------------------------------------------------------------------------------------- | --------- | --- | ------------------------------------------------------------------------ | - | ----- | --------------------------------------------------------------------------------------------------------------------------------------- |  |  | --------- | ---
|                                                           |  | (a)                                                                                      |           |     | (b)                                                                      |   |       | (c)                                                                                                                                     | 
|Plan Category                                              |  | Number of Securities tobe Issued Upon Exerciseof Outstanding
Options,Warrants and Rights |           |     | Weighted AverageExercise Price ofOutstanding Options,Warrants and
Rights |   |       | Number of SecuritiesRemaining Available for FutureIssuance Under
EquityCompensation Plans (ExcludingSecurities Reflected in Column (a)) | 
|Equity compensation plans approved by security holders     |  |                                                                                          | 2,588,170 | (1) |                                                                          | $ | 10.27 |                                                                                                                                         |  |  | 3,706,043 | (2)
|Equity compensation plans not approved by security holders |  |                                                                                          | N/A       |     |                                                                          |   | N/A   |                                                                                                                                         |  |  | N/A       |    
|                                                           |  |                                                                                          |           |     |                                                                          |   |       |                                                                                                                                         |  |  |           |    
|Total                                                      |  |                                                                                          | 2,588,170 |     |                                                                          |   |       |                                                                                                                                         |  |  | 3,706,043 |    
|                                                           |  |                                                                                          |           |     |                                                                          |   |       |                                                                                                                                         |  |  |           |    



| | (1) | Represents 90,000 shares issuable under the 1994 Stock Option Plan for Non-Employee Directors, 1,895,670 shares issuable under the 2003 Employee Stock Incentive Plan
and 602,500 shares issuable under the Amended and Restated 2003 Stock Incentive Plan for Non-Employees. | 
| | --- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | 

| | (2) | Under the 2003 Employee Stock Incentive Plan and the Amended and Restated 2003 Stock Incentive Plan for Non-Employees, 2,097,968 shares and 1,608,075 shares,
respectively, remain available for future issuance. | 
| | --- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | 



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##### Table of Contents

Summaries of Plans Not Approved by Our Shareholders

Deferred Fee Plan.The Deferred Fee Plan became effective on January 1, 2007. Under
the terms of the Deferred Fee Plan, directors may elect to defer the receipt of cash and stock fees for their services as directors. Each director may elect the type of fees to be deferred, the percentage of such fees to be deferred, and the form in
which the deferred fees and any earnings thereon are to be paid. Deferred cash fees may be directed to a deferred cash account or a deferred stock account (or both). Deferred stock fees may only be directed to a deferred stock account. Elections to
defer fees remain in force, unless amended or revoked within the required time periods.

The deferred cash account will be
credited with interest on the cash balance at the end of each calendar quarter. The interest rate is equal to the rate of interest payable by us on our revolving credit facility, as determined as of the first day of each calendar quarter. The
deferred stock account will be credited with stock dividends (or with cash dividends that are converted to deferred stock credits pursuant to the plan.)

Distribution of a directors cash and stock accounts will begin on January 15 of the year following the directors termination of all services with us. Distributions from the deferred stock
account will be made in cash. Distribution will either be made in a lump-sum payment or in up to five consecutive installments as elected by the director.

Individual Option Grants.We have entered into various option agreements with non-employee directors, advisors and other parties in connection with providing certain
services, acquisitions and other matters. Such options have various vesting schedules and exercise prices and have been included in the equity compensation plan table above.

The other information required for this item is incorporated by reference from our Proxy Statement to be filed in connection with our Annual Meeting of Shareholders.



|ITEM 13. | CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE
|-------- | -------------------------------------------------------------------------

The information required for this item is incorporated by reference from our Proxy Statement to be filed in connection with our 2010 Annual Meeting of Shareholders.



|ITEM 14. | PRINCIPAL ACCOUNTING FEES AND SERVICES
|-------- | --------------------------------------

The information required for this item is incorporated by reference from our Proxy Statement to be filed in connection with our 2011 Annual Meeting of Shareholders.

PART IV



|ITEM 15. | EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
|-------- | ------------------------------------------



|    |  |    |  |                                                                                                                                                                     
|--- |  | -- |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------
|(a) |  | 1. |  | Financial Statements - the consolidated financial statements and the reports of the Independent Registered Public Accounting firms are listed on page 55 through
96.
|    |  |   
|    |  | 2. |  | Financial Statement Schedules - Schedule II - Valuation and Qualifying Accounts.                                                                                    
|    |  |   
|    |  | 3. |  | Exhibits including those incorporated by reference:                                                                                                                 



|         |  |                                                                                                                                                                                                                                                                                  
|-------- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Exhibits |  | Description                                                                                                                                                                                                                                                                      
|         | 
|3.1      |  | Composite Articles of Incorporation of MasTec, Inc. filed as Exhibit 3.1 to our Annual Report on Form 10-K filed with the SEC on February 25, 2010 and incorporated by reference
herein.*                                                                                        
|         | 
|3.2      |  | Amended and Restated By-laws of MasTec, Inc., amended and restated as of January 22, 2010, filed as Exhibit 3.1 to our Current Report on Form 8-K filed with the SEC on January 28,
2010 and incorporated by reference herein.                                                   
|         | 
|4.1      |  | Indenture, dated January 31, 2007, by and among MasTec, Inc., certain of MasTecs subsidiaries and U.S. Bank National Association, as trustee filed as Exhibit 4.1 to our
Current Report on Form 8-K filed with the SEC on February 2, 2007 and incorporated by reference herein.



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|       |  |                                                                                                                                                                                                                                                                                                                                                                                    
|------ |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|       | 
|4.2    |  | Supplemental Indenture dated as of May 2, 2007 among MasTec, Inc., U.S. Bank National Association and each of the MasTec subsidiary guarantors set forth therein filed as
Exhibit 4.1 to our Quarterly Report on Form 10-Q filed with the SEC on May 2, 2007 and incorporated by reference herein.                                                                                 
|       | 
|4.3    |  | Form of 4.0% Senior Convertible Note due 2014 filed as Exhibit 4.1 to our Current Report on Form 8-K filed with the SEC on June 5, 2009 and incorporated by reference
herein.                                                                                                                                                                                                      
|       | 
|4.4    |  | Indenture, dated June 5, 2009, by and among MasTec, Inc., MasTec Inc.s subsidiaries party thereto, as guarantors, and U.S. Bank National Association, as trustee filed as
Exhibit 4.2 to our Current Report on Form 8-K filed with the SEC on June 5, 2009 and incorporated by reference herein.                                                                                  
|       | 
|4.5    |  | First Supplemental Indenture, dated June 5, 2009, by and among MasTec, Inc., MasTec Inc.s subsidiaries party thereto, as guarantors, and U.S. Bank National Association,
as trustee filed as Exhibit 4.3 to our Current Report on Form 8-K filed with the SEC on June 5, 2009 and incorporated by reference herein.                                                               
|       | 
|4.6    |  | Form of 4.25% Senior Convertible Note due 2014 (incorporated by reference to Exhibit A to the Supplemental Indenture) filed as Exhibit 4.3 to our Current Report on Form 8-K filed
with the SEC on November 10, 2009 and incorporated by reference herein.                                                                                                                         
|       | 
|4.7    |  | Second Supplemental Indenture, dated November 10, 2009, by and among MasTec, Inc., MasTec Inc.s subsidiaries party thereto, as guarantors, and U.S. Bank National Association,
as trustee filed as Exhibit 4.3 to our Current Report on Form 8-K filed with the SEC on November 10, 2009 and incorporated by reference herein.                                                    
|       | 
|4.8    |  | Form of 4.00% Senior Convertible Note due 2014, incorporated by reference to Exhibit A to the Third Supplemental Indenture filed as Exhibit 4.2 to our Current Report on Form 8-K
filed with the SEC on January 14, 2011 and incorporated by reference herein.                                                                                                                     
|       | 
|4.9    |  | Third Supplemental Indenture, dated January 11, 2011, by and among MasTec, Inc., MasTec Inc.s subsidiaries party thereto, as guarantors, and U.S. Bank National Association, as
trustee filed as Exhibit 4.2 to our Current Report on Form 8-K filed with the SEC on January 14, 2011 and incorporated by reference herein.                                                       
|       | 
|4.10   |  | Form of 4.25% Senior Convertible Note due 2014, incorporated by reference to Exhibit A to the Fourth Supplemental Indenture filed as Exhibit 4.4 to our Current Report on Form 8-K
filed with the SEC on January 14, 2011 and incorporated by reference herein.                                                                                                                    
|       | 
|4.11   |  | Fourth Supplemental Indenture, dated January 11, 2011, by and among MasTec, Inc., MasTec Inc.s subsidiaries party thereto, as guarantors, and U.S. Bank National Association,
as trustee filed as Exhibit 4.2 to our Current Report on Form 8-K filed with the SEC on January 14, 2011 and incorporated by reference herein.                                                      
|       | 
|10.2+  |  | NonEmployee Directors Stock Plan filed as Exhibit 10.6 to our Registration Statement on Form S-1 (Registration No. 333-129790) and incorporated by reference
herein.                                                                                                                                                                                                             
|       | 
|10.3+  |  | 2003 Employee Stock Incentive Plan as amended and restated as of January 1, 2006, filed as Exhibit 10.5 to our Current Report on Form 8-K filed with the SEC on April 6, 2006 and
incorporated by reference herein.                                                                                                                                                                
|       | 
|10.4+  |  | Amended and Restated 2003 Stock Incentive Plan for NonEmployees as amended and restated as of January 1, 2006, filed as Exhibit 10.4 to our Current Report on Form 8-K filed
with SEC on April 6, 2006 and incorporated by reference herein.                                                                                                                                      
|       | 
|10.6+  |  | Deferred Fee Plan for Directors dated December 19, 2005, filed as Exhibit 10.38 to our Form 8-K filed with the SEC on December 23, 2005 and incorporated by reference
herein.                                                                                                                                                                                                      
|       | 
|10.7   |  | Asset Purchase Agreement dated December 30, 2006, by and among MasTec North America AC, LLC, MasTec, Inc., Ronald E. Phillips, Dawn M. Phillips, Digital Satellite Services Employee
Stock Ownership Trust and Digital Satellite Services, Inc filed as Exhibit 10.39 to our Registration Statement on Form S-1 (Registration No. 333-129790) and incorporated by reference herein.
|       | 
|10.8+  |  | Form of Restricted Stock Agreement for the MasTec, Inc. Amended and Restated 2003 Stock Incentive Plan for Employees filed as Exhibit 10.7 to our Current Report on Form 8-K filed
with the SEC on April 6, 2006 and incorporated by reference herein.                                                                                                                             
|       | 
|10.9+  |  | Form of Stock Option Agreement for the MasTec, Inc. Amended and Restated 2003 Stock Incentive Plan for Employees filed as Exhibit 10.8 to our Current Report on Form 8-K filed with
the SEC on April 6, 2006 and incorporated by reference herein.                                                                                                                                 
|       | 
|10.10+ |  | Form of Restricted Stock Agreement for the MasTec, Inc. Amended and Restated 2003 Stock Incentive Plan for Non-Employees filed as Exhibit 10.9 to our Current Report on Form 8-K
filed with the SEC on April 6, 2006 and incorporated by reference herein.                                                                                                                         



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|       |  |                                                                                                                                                                                                                                                                                                                                                                                                       
|------ |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|       | 
|10.11+ |  | Form of Stock Option Agreement for the MasTec, Inc. Amended and Restated 2003 Stock Incentive Plan for Non-Employees filed as Exhibit 10.10 to our Current Report on Form 8-K filed
with the SEC on April 6, 2006 and incorporated by reference herein.                                                                                                                                               
|       | 
|10.12  |  | Asset Purchase Agreement dated as of November 9, 2006 between MasTec North America, Inc. and LM-ITS Acquisition LLC filed as Exhibit 10.54 to our Quarterly Report on Form 10-Q for
the quarter ended September 30, 2006 and filed with the SEC on November 9, 2006, and incorporated by reference herein.                                                                                            
|       | 
|10.13  |  | Amended and Restated Asset Purchase Agreement dated February 14, 2007, by and between MasTec North America and Atlas Traffic Management Systems, LLC, filed as Exhibit 10.1 to our
Current Report on Form 8-K filed with the SEC on February 20, 2007 and incorporated by reference herein.                                                                                                           
|       | 
|10.14  |  | Stipulation and Settlement Agreement filed at Exhibit 10.55 to the Form 10-Q filed with the SEC on November 6, 2007 and incorporated by reference herein                                                                                                                                                                                                                                              
|       | 
|10.15+ |  | Employment Agreement dated April 18, 2007 by and between MasTec, Inc. and Jose Mas filed as Exhibit 10.1 to our Current Report on Form 8-K filed with the SEC on April 20, 2007 and
incorporated by reference herein.                                                                                                                                                                                 
|       | 
|10.16  |  | Settlement Agreement dated January 24, 2008 by and between MasTec North America, Inc. and Atlas filed as Exhibit 10.1 to our Current Report on Form 8-K filed with the SEC on January
30, 2008 and incorporated by reference herein.                                                                                                                                                                  
|       | 
|10.17  |  | Revised Amended and Restated Asset Purchase Agreement dated January 24, 2008 by and between MasTec North America, Inc. and Atlas filed as Exhibit 10.2 to our Current Report on Form
8-K filed with the SEC on January 30, 2008 and incorporated by reference herein.                                                                                                                                 
|       | 
|10.18+ |  | MasTec, Inc. Deferred Compensation Plan filed as Exhibit 99.1 to our Current Report on Form 8-K filed with the SEC on April 4, 2008 and incorporated by reference
herein.                                                                                                                                                                                                                             
|       | 
|10.19  |  | Stock Purchase Agreement executed on May 30, 2008 and dated as of May 1, 2008, between MasTec North America, Inc., as buyer, and Alan B. Roberts, as seller filed as
Exhibit 10.1 to our Current Report on Form 8-K filed with the SEC on June 5, 2008 and incorporated by reference herein.                                                                                                          
|       | 
|10.23  |  | Second Amended and Restated Loan and Security Agreement dated July 29, 2008, by and among MasTec, Inc., certain of its subsidiaries, Bank of America, N.A., as collateral and
administrative agent and General Electric Capital Corporation, as syndication agent filed as Exhibit 10.7 to our Quarterly Report on Form 10-Q filed with the SEC on July 30, 2008 and incorporated by reference herein.
|       | 
|10.24  |  | Stock Purchase Agreement dated October 4, 2008 among MasTec, Inc., MasTec North America, Inc., Wanzek Construction, Inc., and the shareholders of Wanzek filed as Exhibit 10.1
to our Current Report on Form 8-K filed with the SEC on October 6, 2008 and incorporated by reference herein.                                                                                                          
|       | 
|10.25  |  | First Amendment to Stock Purchase Agreement dated December 2, 2008 among MasTec, Inc., MasTec North America, Inc., Wanzek Construction, Inc., and the shareholders of Wanzek
filed as Exhibit 10.1 to our Current Report on Form 8-K with the SEC on December 3, 2008 and incorporated by reference herein.                                                                                           
|       | 
|10.26  |  | Second Amendment to Stock Purchase Agreement, dated December 16, 2008, among MasTec, Inc., MasTec North America, Inc., Wanzek Construction, Inc. and the shareholders of Wanzek
as Exhibit 10.1 to our Current Report on Form 8-K filed with SEC on December 18, 2008 and incorporated by reference herein.                                                                                           
|       | 
|10.28  |  | Letter Amendment to the Second Amended and Restated Loan and Security Agreement dated December 16, 2008 among MasTec, Inc. and the other borrowers signatory thereto and Bank of
America, as agent and a lender, and the other lenders signatory thereto filed as Exhibit 10.3 to our Current Report on Form 8-K filed with the SEC on December 18, 2008 and incorporated by reference herein.        
|       | 
|10.29  |  | Third Amendment to Stock Purchase Agreement, dated June 1, 2009, among MasTec, Inc., MasTec North America, Inc., Wanzek Construction, Inc. and the shareholders of Wanzek
Construction, Inc. filed as Exhibit 10.1 to our Current Report on Form 8-K filed with the SEC on June 2, 2009 and incorporated by reference herein.                                                                         
|       | 
|10.31  |  | Letter Amendment, dated June 1, 2009, among MasTec, Inc. and the other borrowers signatory thereto and Bank of America, as agent and a lender, and the other lenders signatory
thereto filed as Exhibit 10.4 to our Current Report on Form 8-K filed with the SEC on June 2, 2009 and incorporated by reference herein.                                                                               
|       | 
|10.32+ |  | Employment Agreement between MasTec, Inc. and C. Robert Campbell executed on October 27, 2009 filed as Exhibit 10.69 to our Quarterly Report on Form 10-Q filed with the SEC on
October 28, 2009 and incorporated by reference herein.                                                                                                                                                                
|       | 
|10.33+ |  | Split-Dollar Agreement between MasTec, Inc. and Jorge Mas dated October 28, 2009 filed as Exhibit 10.70 to our Quarterly Report on Form 10-Q filed with the SEC on October 28, 2009
and incorporated by reference herein                                                                                                                                                                              



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|       |  |                                                                                                                                                                                                                                                                                                                                                                                                      
|------ |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|       | 
|10.34+ |  | Deferred Bonus Agreement between MasTec, Inc. and Jorge Mas dated October 28, 2009 filed as Exhibit 10.71 to our Quarterly Report on Form 10-Q filed with the SEC on
October 28, 2009 and incorporated by reference herein                                                                                                                                                                           
|       | 
|10.35+ |  | Split-Dollar Agreement between MasTec, Inc. and Jose Mas dated October 28, 2009 filed as Exhibit 10.72 to our Quarterly Report on Form 10-Q filed with the SEC on October 28, 2009
and incorporated by reference herein.                                                                                                                                                                             
|       | 
|10.36+ |  | Deferred Bonus Agreement between MasTec, Inc. and Jose Mas dated October 28, 2009 filed as Exhibit 10.73 to our Quarterly Report on Form 10-Q filed with the SEC on October 28, 2009
and incorporated by reference herein.                                                                                                                                                                           
|       | 
|10.37  |  | Purchase Agreement, dated November 3, 2009, by and among MasTec, Inc., Precision Acquisition, LLC, Precision Pipeline LLC, Precision Transport Company, LLC, PPL Management, Inc.,
Michael Daniel Murphy, Steven R. Rooney, Angela D. Murphy and Karen K. Rooney filed as Exhibit 10.1 to our Current Report on Form 8-K filed with the SEC on November 4, 2009 and incorporated by reference herein.
|       | 
|10.38  |  | Letter Amendment dated November 3, 2009 to the Second Amended and Restated Loan and Security Agreement among the MasTec, Inc., the guarantors party thereto, Bank of America, N.A.,
as administrative agent, and the lenders party thereto filed as Exhibit 10.3 to our Current Report on Form 8-K filed with the SEC on November 10, 2009 and incorporated by reference herein.                     
|       | 
|10.39+ |  | Employment Agreement executed on January 26, 2010 between MasTec, Inc. and Ray Harris filed as Exhibit 10.1 to our Current Report on Form 8-K filed with the SEC on January 28,
2010 and incorporated by reference herein.                                                                                                                                                                           
|       | 
|10.40+ |  | Employment Agreement executed on January 26, 2010 between MasTec, Inc. and Robert Apple filed as Exhibit 10.2 to our Current Report on Form 8-K filed with the SEC on
January 28, 2010 and incorporated by reference herein.                                                                                                                                                                         
|       | 
|10.41  |  | Purchase Option Agreement dated July 6, 2010, among MasTec, Inc., MasTec North America, Inc., Red Ventures LLC and certain other parties named therein filed as Exhibit 10.1 to our
Current Report on Form 8-K filed with the SEC on July 9, 2010 and incorporated by reference herein.                                                                                                              
|       | 
|10.42  |  | Letter Amendment dated November 24, 2010 to the Second Amended and Restated Loan and Security Agreement among the MasTec, Inc., the guarantors party thereto, Bank of America, N.A.,
as administrative agent, and the lenders party thereto filed as Exhibit 10.1 to our Current Report on Form 8-K filed with the SEC on November 24, 2010 and incorporated by reference herein.                    
|       | 
|10.43* |  | Asset Purchase Agreement as amended through December 24, 2010, by and among NSORO, LLC, NSORO MasTec, LLC, and Darrell J. Mays.                                                                                                                                                                                                                                                                      
|       | 
|21*    |  | Subsidiaries of MasTec, Inc.                                                                                                                                                                                                                                                                                                                                                                         
|       | 
|23.1*  |  | Consent of Independent Registered Public Accounting Firm.                                                                                                                                                                                                                                                                                                                                            
|       | 
|23.2*  |  | Consent of Independent Valuation Firm.                                                                                                                                                                                                                                                                                                                                                               
|       | 
|31.1*  |  | Certifications required by Section 302(b) of the Sarbanes-Oxley Act of 2002.                                                                                                                                                                                                                                                                                                                         
|       | 
|31.2*  |  | Certifications required by Section 302(b) of the Sarbanes-Oxley Act of 2002.                                                                                                                                                                                                                                                                                                                         
|       | 
|32.1*  |  | Certifications required by Section 906 of the Sarbanes-Oxley Act of 2002.                                                                                                                                                                                                                                                                                                                            
|       | 
|32.2*  |  | Certifications required by Section 906 of the Sarbanes-Oxley Act of 2002.                                                                                                                                                                                                                                                                                                                            



|* | Filed herewith.
|- | ---------------

|+ | Management contract or compensation plan arrangement.
|- | -----------------------------------------------------



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MASTEC, INC.

SCHEDULE II  VALUATION AND QUALIFYING ACCOUNTS

(In millions)



|                                                   |  |                              |      |  |         |   |      |              |  |   |                        |      |  |   |      | 
|-------------------------------------------------- |  | ---------------------------- | ---- |  | ------- | - | ---- | ------------ |  | - | ---------------------- | ---- |  | - | ---- | 
|                                                   |  | Balance atBeginningof
Period |      |  | Charges |   |      | (Deductions) |  |   | Balance atEnd
ofPeriod |     
|Year ended December 31, 2010                       |  |                              |      |  |         |   |      |              |  |   |                        |      |  |   |      | 
|Deducted from asset accounts:                      |  |                              |      |  |         |   |      |              |  |   |                        |      |  |   |      | 
|Allowance for doubtful accounts                    |  | $                            | 10.3 |  |         | $ | 2.9  | (1)          |  | $ | (4.7                   | )(3) |  | $ | 8.5  | 
|Unrealized losses on securities available for sale |  |                              | 3.0  |  |         |   |     |              |  |   | (2.2                   | )(6) |  |   | 0.8  | 
|Valuation allowance for deferred tax assets        |  |                              | 5.4  |  |         |   | 0.2  | (7)          |  |   |                       |      |  |   | 5.6  | 
|                                                   |  |                              |      |  |         |   |      |              |  |   |                        |      |  |   |      | 
|Total                                              |  | $                            | 18.7 |  |         | $ | 3.1  |              |  | $ | (6.9                   | )    |  | $ | 14.9 | 
|                                                   |  |                              |      |  |         |   |      |              |  |   |                        |      |  |   |      | 
|Year ended December 31, 2009                       |  |                              |      |  |         |   |      |              |  |   |                        |      |  |   |      | 
|Deducted from asset accounts:                      |  |                              |      |  |         |   |      |              |  |   |                        |      |  |   |      | 
|Allowance for doubtful accounts                    |  | $                            | 11.6 |  |         | $ | 2.4  | (1)          |  | $ | (3.7                   | )(3) |  | $ | 10.3 | 
|Unrealized losses on securities available for sale |  |                              | 13.1 |  |         |   |     |              |  |   | (10.1                  | )(5) |  |   | 3.0  | 
|Valuation allowance for deferred tax assets        |  |                              | 24.2 |  |         |   |     |              |  |   | (18.8                  | )(4) |  |   | 5.4  | 
|                                                   |  |                              |      |  |         |   |      |              |  |   |                        |      |  |   |      | 
|Total                                              |  | $                            | 48.9 |  |         | $ | 2.4  |              |  | $ | (32.6                  | )    |  | $ | 18.7 | 
|                                                   |  |                              |      |  |         |   |      |              |  |   |                        |      |  |   |      | 
|Year ended December 31, 2008                       |  |                              |      |  |         |   |      |              |  |   |                        |      |  |   |      | 
|Deducted from asset accounts:                      |  |                              |      |  |         |   |      |              |  |   |                        |      |  |   |      | 
|Allowance for doubtful accounts                    |  | $                            | 15.3 |  |         | $ | 3.5  | (1)          |  | $ | (7.1                   | )(3) |  | $ | 11.7 | 
|Unrealized losses on securities available for sale |  |                              | 4.8  |  |         |   | 8.3  | (2)          |  |   |                       |      |  |   | 13.1 | 
|Valuation allowance for deferred tax assets        |  |                              | 47.9 |  |         |   |     |              |  |   | (23.7                  | )(4) |  |   | 24.2 | 
|                                                   |  |                              |      |  |         |   |      |              |  |   |                        |      |  |   |      | 
|Total                                              |  | $                            | 68.0 |  |         | $ | 11.8 |              |  | $ | (30.8                  | )    |  | $ | 49.0 | 
|                                                   |  |                              |      |  |         |   |      |              |  |   |                        |      |  |   |      | 



|(1) | Provision for doubtful accounts.
|--- | --------------------------------

|(2) | Unrealized losses recorded in other comprehensive income.
|--- | ---------------------------------------------------------

|(3) | Write-offs and reversals of uncollectible accounts.
|--- | ---------------------------------------------------

|(4) | Decrease in valuation allowance for deferred tax assets is due primarily to the utilization of tax loss carryforwards and other tax benefits.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------

|(5) | Change in unrealized losses on securities available for sale is comprised of $4.0 million of unrealized gains recorded in other comprehensive income, and $6.1 million
of credit losses recognized in earnings.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(6) | Change represents $1.2 million of credit and other losses recognized in earnings, $0.9 million reversal of unrealized losses upon sale of securities, and $0.1 million,
net, of unrealized gains recognized in other comprehensive income.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(7) | Increase in the foreign tax loss carryforward.
|--- | ----------------------------------------------



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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this
report to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Miami, State of Florida, on February 23, 2011.



MASTEC, INC./s/    JOSE R. MASJose R. MasChief Executive Officer(Principal Executive Officer)/s/    C. ROBERT CAMPBELLC. Robert CampbellChief Financial Officer(Principal Financial and Accounting Officer)


Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the Registrant and in the capacities indicated on
February 23, 2011.



|                                             |  |                                                                     
|-------------------------------------------- |  | --------------------------------------------------------------------
|/s/    JORGE MAS
Jorge Mas                   |  | Chairman of the Board of Directors                                  
|                                             | 
|/s/    JOSE R. MAS
Jose R. Mas               |  | Chief Executive Officer and Director
(Principal Executive Officer)  
|                                             | 
|/s/    C. ROBERT CAMPBELL
C. Robert Campbell |  | Chief Financial Officer (Principal Financial and Accounting Officer)
|                                             | 
|/s/    ERNST N. CSISZAR
Ernst N. Csiszar     |  | Director                                                            
|                                             | 
|/s/    ROBERT J. DWYER
Robert J. Dwyer       |  | Director                                                            
|                                             | 
|/s/    FRANK E. JAUMOT
Frank E. Jaumot       |  | Director                                                            
|                                             | 
|/s/    JULIA L. JOHNSON
Julia L. Johnson     |  | Director                                                            
|                                             | 
|/s/    JOSE S. SORZANO
Jose S. Sorzano       |  | Director                                                            
|                                             | 
|/s/    JOHN VAN HEUVELEN
John Van Heuvelen   |  | Director                                                            



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Exhibit Index



|      |  |                                                                                                                                
|----- |  | -------------------------------------------------------------------------------------------------------------------------------
|10.43 |  | Asset Purchase Agreement as amended through December 24, 2010, by and among NSORO, LLC, NSORO MasTec, LLC, and Darrell J. Mays.
|      | 
|21    |  | Subsidiaries of MasTec, Inc.                                                                                                   
|      | 
|23.1  |  | Consent of Independent Registered Public Accounting Firm.                                                                      
|      | 
|23.2  |  | Consent of Independent Valuation Firm.                                                                                         
|      | 
|31.1  |  | Certifications required by Section 302(b) of the Sarbanes-Oxley Act of 2002.                                                   
|      | 
|31.2  |  | Certifications required by Section 302(b) of the Sarbanes-Oxley Act of 2002.                                                   
|      | 
|32.1  |  | Certifications required by Section 906 of the Sarbanes-Oxley Act of 2002.                                                      
|      | 
|32.2  |  | Certifications required by Section 906 of the Sarbanes-Oxley Act of 2002.                                                      



105