Company: MTZ
Filing Date: 2025-02-28
Form Type: S-3ASR
Source: 0001193125-25-042499
Chunk: 7

Company: MASTEC INC
Filing Date: 2025-02-28
Form: S-3ASR
Chunk 7
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 customer fulfillment activities related to communications infrastructure,
primarily for wireless and wireline/fiber communications, wireless integration and optimization and install-to-the-home services,
as well as infrastructure for utilities, among others. The Clean Energy and Infrastructure segment primarily serves energy, utility, government and other end-markets through the installation and construction
of power generation facilities, primarily from clean energy and renewable sources, such as wind, solar, biomass, natural gas and hydrogen, as well as battery storage systems for renewable energy; various types of heavy civil and industrial
infrastructure services, including roads, bridges and rail; and environmental remediation services. The Power Delivery segment primarily serves the energy, utility and data center infrastructure industries through the engineering, construction and
maintenance of power transmission and distribution infrastructure, including electrical and gas lines, power reserve and battery infrastructure, and distribution network systems, substations and grid modernization, emergency restoration services
following natural disasters and accidents; and environmental planning and compliance services. The Pipeline Infrastructure segment performs engineering, construction, maintenance and other services for pipeline infrastructure including natural gas,
water and carbon capture sequestration pipelines, as well as pipeline integrity, including the repair of pipeline infrastructure and facilitating their safe use throughout their

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lifecycle, and other services for the energy and utilities industries. The Other segment includes certain equity investees, the services of which may vary from those provided by our primary
segments, as well as other small business units with activities in certain international end-markets.

We are
incorporated under the laws of the State of Florida. Our principal executive offices are located at 800 S. Douglas Road, 12th Floor, Coral Gables, Florida 33134. Our telephone number is (305) 599-1800.

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USE OF PROCEEDS Primary Offerings Unless the applicable prospectus supplement states otherwise, we expect to use the net proceeds of the sale of these securities for general corporate purposes, which may include:

| • |     | acquisitions of assets and businesses; |

| • |     | repayment of indebtedness outstanding at that time; and |

| • |     | general working capital. |

Any specific allocation of the net proceeds of an offering of securities to a specific purpose will be determined at the time of such offering and will be described in the related supplement to this prospectus. Secondary Offerings The details of any secondary offerings will be set forth in an applicable prospectus supplement, and we will not receive any proceeds from any selling security holder’s sale of our securities registered here