<PAGE>   1
 
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
                                   FORM 10-K
 
   (MARK ONE)
   [X]   ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                     SECURITIES EXCHANGE ACT OF 1934
 
                  FOR THE FISCAL YEAR ENDED DECEMBER 31, 1998
 
                                       OR
 
   [  ]  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                        SECURITIES EXCHANGE ACT OF 1934
 
             FOR THE TRANSITION PERIOD FROM                     TO
 
                          COMMISSION FILE NUMBER 1-06124
 
                            LONE STAR INDUSTRIES, INC.
              (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
<TABLE>
<S>                                                 <C>
                     DELAWARE                                         NO. 13-0982660
         (STATE OR OTHER JURISDICTION OF                             (I.R.S. EMPLOYER
          INCORPORATION OR ORGANIZATION)                           IDENTIFICATION NO.)
             300 FIRST STAMFORD PLACE
                   STAMFORD, CT                                         06912-0014
     (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)                           (ZIP CODE)
</TABLE>
 
       REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (203) 969-8600
 
          SECURITIES REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT:
 
<TABLE>
<CAPTION>
                                                                  NAME OF EACH EXCHANGE
               TITLE OF EACH CLASS                            ON WHICH EACH CLASS REGISTERED
               -------------------                            ------------------------------
<S>                                                 <C>
          Common Stock, par value $1.00                          New York Stock Exchange
                    per share
           Common Stock Purchase Rights                          New York Stock Exchange
          Common Stock Purchase Warrants                         New York Stock Exchange
</TABLE>
 
        SECURITIES REGISTERED PURSUANT TO SECTION 12(g) OF THE ACT: NONE
 
     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 if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K 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]
 
     Aggregate market value of the voting stock held by non-affiliates of the
registrant at March 1, 1999: approximately $601,938,000.
 
     Indicate by check mark whether the registrant has filed all documents and
reports required to be filed by Section 12, 13 or 15(d) of the Securities
Exchange Act of 1934 subsequent to the distribution of Securities under a plan
confirmed by a court. Yes [X]  No [ ]
 
     The number of shares outstanding of each of the registrant's classes of
common stock as of March 1, 1999: Common Stock, par value $1.00 per
share, -- 20,159,413 shares.
 
     PORTIONS OF THE PROXY STATEMENT OF THE REGISTRANT FOR THE ANNUAL MEETING OF
STOCKHOLDERS TO BE HELD ON MAY 13, 1999 ARE INCORPORATED IN PART III OF THIS
REPORT.
 
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<PAGE>   2
 
                               TABLE OF CONTENTS
 
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                                                                       PAGE
                                                                       ----
<S>       <C>                                                          <C>
PART I
Item 1.   Business....................................................    1
Item 2.   Properties..................................................    7
Item 3.   Legal Proceedings...........................................    7
Item 4.   Submission of Matters to a Vote of Security Holders.........    7
 
PART II
Item 5.   Market for the Registrant's Common Equity and Related           9
            Stockholder Matters.......................................
Item 6.   Selected Financial Data.....................................   10
Item 7.   Management's Discussion and Analysis of Financial Condition    11
            and Results of Operations.................................
Item 7A.  Quantitative and Qualitative Disclosures about Market          16
            Risk......................................................
Item 8.   Consolidated Financial Statements and Supplementary Data....   17
Item 9.   Changes in and Disagreements with Accountants on Accounting    39
            and Financial Disclosure..................................
 
                                 PART III
Item 10.  Directors and Executive Officers of the Registrant..........   39
Item 11.  Executive Compensation......................................   39
Item 12.  Security Ownership of Certain Beneficial Owners and            39
            Management................................................
Item 13.  Certain Relationships and Related Transactions..............   39
 
                                  PART IV
Item 14.  Exhibits, Financial Statement Schedule and Reports on Form     40
            8-K.......................................................
</TABLE>
<PAGE>   3
 
                                     PART I
 
ITEM 1.  BUSINESS.
 
THE COMPANY
 
     Lone Star is a cement and ready-mixed concrete company with operations in
the midwestern and southern United States. Lone Star's cement operations consist
of five portland cement plants in the Midwest and Southwest, a slag cement
grinding facility in New Orleans and a 25% interest in Kosmos Cement Company, a
partnership which owns and operates one portland cement plant in Kentucky and
one in Pennsylvania ("Kosmos"). The Company's five wholly-owned portland cement
plants produced approximately 4.0 million tons of cement during 1998, which
approximates the rated capacity of the plants. In addition, the Company's New
Orleans facility produced 237,600 tons of slag cement during 1998. The Company's
ready-mixed concrete business owns or leases and operates several facilities in
the Memphis, Tennessee area. In 1998, the Company had net sales of approximately
$347.1 million.
 
     Lone Star Industries, Inc. was incorporated in 1919. In early 1994, the
Company emerged from proceedings under Chapter 11 of the United States
Bankruptcy Code. The Company's executive offices are located at 300 First
Stamford Place, Stamford, Connecticut 06912, and its telephone number is (203)
969-8600. Unless the context otherwise requires, as used herein "Company" and
"Lone Star" mean Lone Star Industries, Inc. together with its consolidated
subsidiaries.
 
CEMENT OPERATIONS
 
     Portland cement is the primary binding material used in the production of
concrete. The principal raw materials used in the manufacture of cement are
limestone or other calciferous materials, shale or clay, and sand. These raw
materials are crushed, ground, mixed together and then introduced into a rotary
kiln where they are heated to approximately 2700 degrees Fahrenheit. The
resultant marble-sized intermediate material produced by this process is known
as clinker. Clinker is then cooled, blended with a small amount of gypsum, and
ground in a plant's finish mill to produce cement, a dry powder.
 
     Clinker generally is produced utilizing either of two basic methods, a
"wet" or a "dry" process. In a wet process plant, raw materials are mixed with
water to form a slurry which is fed into the kiln. This process has the
advantage of greater ease in the handling and mixing of the raw materials,
however additional heat, and therefore fuel, is required to evaporate the
moisture before the raw materials can react to form clinker. The dry process, a
newer more fuel efficient technology, excludes the addition of water into the
process. Dry process plants are either pre-heater plants, in which recycled hot
air is used to heat materials before they are fed into the kiln, or are
precalciner plants, which have separate burners to accomplish a significant
portion of the chemical reaction of the raw materials before they are fed into
the kiln. The Company recently announced a planned expansion at its Greencastle,
Indiana plant which will convert to a semi-dry manufacturing technology. This
technology has certain features of both the wet and dry processes. While having
somewhat higher fuel needs than traditional dry process plants, the capital
expenditures required for the expansion will be lower than those required for a
dry process.
 
     Whether a wet, dry or semi-dry method is utilized, the manufacture of
cement is energy intensive, and the cost of such energy accounts for
approximately one fourth of a cement plant's total manufacturing costs. Energy
cost, and in particular coal, varies on a regional basis due in large part to
transportation costs. In addition, the low value-to-weight ratio of cement and
its constituent raw materials results in relatively high transportation costs,
creating a largely regional business. As a result, proximity to sources of fuel
and raw materials, as well as markets, are important aspects in the
profitability of a cement plant. While subject to fluctuation and interruption
resulting from adverse weather and other factors, distribution by water is
generally the least expensive method of transporting cement.
 
     Lone Star's cement operations consist principally of the production of Type
I portland cement at the Company's five owned cement plants and the distribution
of that cement through the Company's 15 owned or leased distribution terminals.
Other products manufactured at certain of these plants include Type III portland
<PAGE>   4
 
cement, which is a high early strength cement required in certain applications,
and specialty cements, such as masonry and oil well cement. Slag cement, a
by-product of iron blast furnaces that may be utilized in certain instances in
lieu of portland cement, is ground and distributed from the Company's New
Orleans facility. The Company also purchases cement from both domestic and
international sources for domestic resale. In addition, Lone Star owns a 25%
interest in Kosmos, which owns and operates one cement plant in Kentucky and one
in Pennsylvania.
 
     All of Lone Star's five portland cement plants are fully integrated from
limestone mining through cement production, and the Company estimates that it
has limestone reserves sufficient to permit operation of these plants at current
levels of production for periods ranging from 30 to 100 years. Adequate supplies
of other raw materials such as gypsum, shale, clay and sand are owned, leased or
available for purchase by Lone Star. The Company believes that its plants have
adequate sources from which to purchase power and fuel.
 
     The following table sets forth certain information regarding Lone Star's
portland and slag cement plants and their markets.
 
<TABLE>
<CAPTION>
                                     TONS OF
                                  RATED ANNUAL
PLANT LOCATION                   CEMENT CAPACITY       PROCESS               FUEL           PRINCIPAL MARKET AREA
--------------                   ---------------   ---------------   ---------------------  ---------------------
                                 (IN THOUSANDS)
<S>                              <C>               <C>               <C>                    <C>
PORTLAND CEMENT
-------------------------------
Cape Girardeau, Missouri.......       1,300        Dry/Precalciner   Coal-Waste-Tires       E. Missouri; Central
                                                                                            and N.E. Arkansas;
                                                                                            Mississippi; S.
                                                                                            Louisiana; N.
                                                                                            Alabama; Tennessee;
                                                                                            N.W. Kentucky; S.W.
                                                                                            Illinois
Greencastle, Indiana...........         750*            Wet*         Coal-Waste             Indianapolis and
                                                                                            other areas of
                                                                                            Indiana; S.E.
                                                                                            Illinois; N. Central
                                                                                            Kentucky
Pryor, Oklahoma................         725              Dry         Coal-Coke-Natural Gas  W. Arkansas;
                                                                                            Oklahoma; Dallas,
                                                                                            Texas; Kansas; W.
                                                                                            Missouri
Oglesby, Illinois..............         600              Dry         Coal-Coke-Tires        Chicago and other
                                                                                            areas of Northern and
                                                                                            Central Illinois; S.
                                                                                            Wisconsin
Maryneal, Texas................         520         Dry/Preheater    Coal-Coke-Natural Gas  W. Texas; Dallas,
                                                                                            Texas; Eastern New
                                                                                            Mexico
Kosmos Cement Company:
  Kosmosdale, Kentucky.........         875**       Dry/Preheater    Coal-Oil               Kentucky; S. Indiana;
                                                                                            S. Ohio; W. Virginia
  Pittsburgh, Pennsylvania.....         400              Wet         Coal                   W. Pennsylvania; W.
                                                                                            Virginia; E. Ohio
SLAG CEMENT
-------------------------------
New Orleans, Louisiana.........         600           Grinding       Natural Gas            S. Alabama; S.W.
                                                      Facility                              Georgia; Louisiana;
                                                                                            Mississippi; Dallas
                                                                                            and Houston, Texas;
                                                                                            Florida Panhandle
</TABLE>
 
---------------
*  Capital projects have been announced to increase the rated production
   capacity of this plant by 600,000 short tons to 1.35 million short tons. Upon
   completion of this project, the plant will convert to a semi-dry
   manufacturing technology.
 
** Capital projects have been announced to increase the rated production
   capacity of this plant by 700,000 short tons to 1.575 million short tons.
 
                                        2
<PAGE>   5
 
     Cape Girardeau Complex.  Lone Star's Cape Girardeau, Missouri plant is
located on the Mississippi River, and its related terminals are located along
the Mississippi and certain of its tributaries. Approximately 80% of the plant's
cement production is shipped up and down these rivers via 19 owned barges,
enabling the plant to serve a relatively wide market. Trucks and rail are also
available to transport product. The Cape Girardeau plant includes a modern
dry/precalciner kiln and burns hazardous waste fuels. See "Business --
Environmental Regulation". The distribution terminals and warehouse supporting
the Cape Girardeau plant are located in St. Louis, Missouri; Paducah, Kentucky;
and Nashville, Knoxville and Memphis, Tennessee. In addition to its other
customers, this complex supplies cement to Lone Star's ready-mixed concrete
operations in Memphis, Tennessee.
 
     Greencastle Complex.  Lone Star's Greencastle plant is located
approximately 40 miles southwest of Indianapolis, Indiana and is the nearest
cement plant to this market, providing a freight cost advantage. Product is
transported by truck to Indianapolis and by truck or rail to other markets. A
portion of the Greencastle plant's production is a high quality Type III
portland cement which commands a premium price relative to Type I portland
cement, the Company's primary product. The Company has announced a planned
600,000 short ton rated annual production capacity increase at this plant which
will convert to a semi-dry manufacturing technology. This project is expected to
come on line in the first half of 2000 and is expected to cost approximately
$75.0 million, $45.0 million of which is expected to be spent in 1999. The
Greencastle complex has distribution terminals located in Fort Wayne and
Elkhart, Indiana; and has a warehousing and distribution arrangement in Itasca,
Illinois.
 
     Pryor Complex.  The Pryor plant is located approximately 50 miles northeast
of Tulsa, Oklahoma and serves its markets by truck and rail. A portion of the
plant's product is transported by barge. This plant produces both portland and
oil well cement. The plant has relatively low power costs due to its proximity
to two low-cost sources. The complex has distribution terminals located near
Wichita and Kansas City, Kansas; near Oklahoma City, Oklahoma; and in Dallas,
Texas.
 
     Oglesby Complex.  The Oglesby plant is located approximately 100 miles from
Chicago and serves that and other northern and central Illinois construction
markets by truck and rail. The complex has a distribution terminal located in
Milwaukee, Wisconsin.
 
     Maryneal Complex.  The Maryneal plant produces both portland and oil well
cement and serves the western Texas market by truck and rail. The complex has a
distribution terminal located in Amarillo, Texas and also shares the use of the
Dallas, Texas terminal with the Company's Pryor plant.
 
     Kosmos Cement Company.  Lone Star owns a 25% interest in Kosmos, which owns
and operates a cement plant in Kosmosdale, Kentucky and one in Pittsburgh,
Pennsylvania. Southdown, Inc., a publicly-traded cement company, owns the
remaining 75% interest and is responsible for managing day-to-day operations.
All major decisions relating to Kosmos, however, require unanimous approval of
its management committee which includes a Lone Star representative. Kosmos has
announced a planned expansion of its Kentucky plant, which will add 700,000
short tons of rated production capacity at an estimated total cost of
approximately $93.0 million, financed with capital contributions from the
partners. The expansion is expected to come on line during the year 2000.
 
     New Orleans Facility.  The New Orleans facility, located on a canal off the
Gulf Intercoastal Waterway, consists of a slag cement grinding and storage
facility with 600,000 tons of capacity, a distribution terminal used for
receiving and storing cement from the Company's Cape Girardeau and Pryor plants
as well as from international sources, and a stevedoring operation which
includes a transloading system for moving phosphate materials between barges and
railcars. Cement is sold directly from the facility and through terminals in
Atlanta, Georgia; Bonner Springs, Kansas; Brandon and Vicksburg, Mississippi;
St. Louis, Missouri; Memphis and Nashville, Tennessee; and Dallas, Texas.
 
READY-MIXED CONCRETE OPERATIONS
 
     Ready-mixed concrete, a versatile building material used in almost all
construction, is produced by mixing stone, sand, water and admixtures with
cement. Lone Star's ready-mix operations are located in Memphis, Tennessee, and
much of the cement used in these operations comes from the Company's Cape
 
                                        3
<PAGE>   6
 
Girardeau, Missouri plant via the Mississippi River. This vertical integration
has enabled the Company to become a major supplier of ready-mixed concrete to
this market.
 
CONSTRUCTION INDUSTRY CONDITIONS
 
     The markets for the Company's products are highly competitive. Portland
cement is largely a commodity product, and due to this lack of product
differentiation, the Company competes with domestic and international sources of
cement largely on the basis of price. Accordingly, cement prices and the level
of the Company's profitability are very sensitive to shifts in supply and demand
in the Company's markets, and the Company's ability to compete effectively is
dependent on its operating costs being at acceptable levels. To a lesser extent,
other competitive factors such as service, delivery time and proximity to
customers affect the Company's performance.
 
     Construction spending and cement consumption historically have fluctuated
widely. Demand for cement is derived primarily from public (infrastructure)
construction, residential construction and commercial/industrial construction,
which are cyclical and, in turn, are influenced by prevailing economic
conditions, including availability of public funds and interest rate levels.
Moreover, due to cement's low value-to-weight ratio, the industry is largely
regional, with sales in a given market dependent on regional demand which is
tied to local economic factors that may fluctuate more widely than those of the
United States as a whole. In addition, the supply of cement from domestic and
foreign sources can vary from region to region and over time. As a result, even
though the Company sells in more than one area of the country, its operating
results are subject to significant fluctuation. While sales by Lone Star
directly to federal, state and local governmental agencies are not significant,
customers of Lone Star are engaged in a substantial amount of construction in
which government funding is a component.
 
     According to published sources, in 1997 (the last year for which such
figures are available) the United States had 43 companies able to produce
clinker with an aggregate production capacity of approximately 85 million tons
of clinker. During 1997, domestic demand for portland cement totaled
approximately 102 million tons, with foreign imports contributing approximately
19 million tons either of cement or clinker which was ground at domestic
grinding facilities. Imports during 1997 were approximately 24 percent higher
than during 1996. The ten largest companies account for approximately 60% of the
total domestic clinker capacity.
 
     The supply of cement in many areas is affected by the levels of cement
imports from international sources. Factors that typically affect the level of
these imports include ocean shipping rates, excess foreign capacity and access
by importers to domestic distribution channels. Despite current excess foreign
capacity, the Company believes that import levels, while growing in recent
years, have not had a serious detrimental effect on domestic producers in large
part due to anti-dumping orders that were imposed on cement imported from Mexico
and Japan and a suspension agreement signed by Venezuelan exporters requiring
them not to export to the United States at dumped prices. The Company believes
that U.S. anti-dumping law currently provides effective remedies against
unfairly priced imports, improving the condition of the U.S. cement industry.
The anti-dumping orders and the suspension agreement are scheduled to remain in
effect at least until the year 2000 and may continue thereafter if petitioners
prevail in "sunset reviews" before the Commerce Department and the U.S.
International Trade Commission currently scheduled to begin in August 1999. Due
to strong cement demand, as well as existing anti-dumping relief, the Company
and many other cement producers have announced projects that, if implemented,
could increase domestic cement production capacity by approximately 20 million
tons over the next several years through modifications to existing facilities
and the construction of new plants. The Company continues to believe that
significant new domestic production capacity (and in particular greenfield
capacity) is costly to producers. No assurances, however, can be given as to the
long-term effects of either increased domestic production or increased imports
and, due to the regionalized nature of the industry, certain markets could be
affected more than other markets.
 
     The Company has implemented price increases in recent years, and has
announced modest cement price increases effective April 1999; however, these and
future prices will be subject to the market forces described above.
 
                                        4
<PAGE>   7
 
     Construction spending and cement consumption are seasonal, particularly in
the Company's northern markets where colder weather affects construction
activity. Other adverse weather conditions such as flooding, which can interrupt
production and transportation of cement, and extreme heat, which makes pouring
concrete difficult, also affect the Company's operations.
 
CUSTOMERS AND MARKETING; BACKLOG
 
     The Company's customer base primarily consists of ready-mixed concrete
producers, prestressed and other concrete product producers, and highway
construction firms. Taken as a whole, no single customer of the Company
accounted for more than 10% of total sales during 1998. The Company's marketing
effort is handled by local sales forces. Most purchases of the Company's
products are done on a spot basis, and accordingly, order backlogs are not
significant.
 
ENVIRONMENTAL REGULATION
 
     The Company is subject to extensive, stringent and complex federal, state
and local laws, regulations and ordinances pertaining to the quality and the
protection of the environment and human health and safety, requiring the Company
to devote substantial time and resources in an effort to maintain continued
compliance. Many of the laws and regulations apply to the Company's former
activities, properties and facilities as well as its current operations. There
can be no assurances that judicial or administrative proceedings, seeking
penalties or injunctive relief, will not be brought against the Company for
alleged non-compliance with applicable environmental laws and regulations
relating to matters as to which the Company is currently unaware. For instance,
if releases of hazardous substances are discovered to have occurred at
facilities currently or previously owned or operated by the Company, or at
facilities to which the Company has sent waste materials, the Company may be
subject to liability for the investigation and remediation of such sites. In
addition, changes to such regulations or the enactment of new regulations in the
future could require the Company to undertake capital improvement projects or to
cease or curtail certain operations or could otherwise substantially increase
the capital, operating and other costs associated with compliance. For example,
recent worldwide initiatives for limitations on carbon dioxide emissions could
result in the promulgation of statutes or regulations that would adversely
affect certain aspects of United States manufacturing, including the cement
industry.
 
     The Clean Water Act provides a comprehensive federal regulatory scheme
governing the discharge of pollutants to waters of the United States. This
regulatory scheme requires that permits be secured for discharges of wastewater,
including stormwater runoff associated with industrial activity, to waters of
the United States. The Company has secured or has applied for all required
permits in connection with its wastewater and stormwater discharges.
 
     The Clean Air Act provides for a uniform federal regulatory scheme
governing the control of air pollutant emissions and permit requirements. In
addition, certain states in which the Company operates have enacted laws and
regulations governing the emission of air pollutants and requiring permits for
sources of air pollutants. The Company is required to apply for federal
operating permits for each of its cement manufacturing facilities. All of these
applications have been made. As part of the permitting process, the Company may
be required to install equipment to monitor emissions of air pollutants from its
facilities. In addition, the United States Environmental Protection Agency
("EPA") is required to develop regulations directed at reducing emissions of
toxic air pollutants from a variety of industrial sources, including the
portland cement manufacturing industry. As part of this process, the EPA has
announced proposed maximum available control technology ("MACT") standards for
cement manufacturing facilities (like Lone Star's Greencastle and Cape Girardeau
plants) that burn hazardous waste fuels ("HWF") and other MACT standards for
facilities burning fossil fuels. These MACT standards are anticipated by the
Company to be effective in 1999 and implemented over a three-year period. The
Company currently anticipates that it will be able to achieve these MACT
standards. The EPA has also promulgated under the Clean Air Act new standards
for small particulate matter and ozone emissions, and related testing will be
carried out over the next several years. Depending on the result of this
testing, additional regulatory burdens could be imposed on the cement industry
by states not in compliance with the regulations. The EPA has promulgated new
regulations to reduce nitrogen oxide emissions
                                        5
<PAGE>   8
 
substantially over the next eight years. These rules would affect 22 states
including three in which the Company has cement plants: Indiana, Illinois and
Missouri. Depending on state implementation, this emissions reduction could
adversely affect the cement industry in these states.
 
     The Resource Conservation and Recovery Act ("RCRA") establishes a
cradle-to-grave regulatory scheme governing the generation, treatment, storage,
handling, transportation and disposal of solid wastes. Solid wastes which are
classified as hazardous wastes pursuant to RCRA, as well as facilities that
treat, store or dispose of such hazardous wastes, are subject to stringent
regulatory requirements. Generally, wastes produced by the Company's operations
are not classified as hazardous wastes and are subject to less stringent federal
and state regulatory requirements. Cement kiln dust ("CKD"), a by-product of
cement manufacturing, is currently exempted from regulation as a hazardous waste
pursuant to the Bevill Amendment to RCRA. However, in 1995, the EPA issued a
regulatory determination regarding the need for regulatory controls on the
management, handling and disposal of CKD. Generally, the EPA regulatory
determination provides that the EPA intends to draft and promulgate regulations
imposing controls on the management, handling and disposal of CKD that will be
based largely on selected components of the existing RCRA hazardous waste
regulatory program, tailored to address the specific regulatory concerns posed
by CKD. The EPA regulatory determination further provides that new CKD
regulations will be designed both to be protective of the environment and to
minimize the burden on cement manufacturers. It is not possible to predict at
this time precisely what new regulatory controls on the management, handling and
disposal of CKD or what increased costs (or range of costs) would be incurred by
the Company to comply with these requirements. These regulations will be
promulgated through a rulemaking scheduled to be completed shortly. These rules
will be implemented over a three-year period following promulgation. The types
of controls being considered by the EPA include fugitive dust emission controls,
restrictions for landfills located in sensitive areas, groundwater monitoring,
standards for liners and caps, metals limits and corrective action for currently
active units.
 
     In 1995, the State of Indiana made a determination that the CKD stored at
the Company's Greencastle plant is a Type I waste and requested that the Company
apply for a formal permit for an on-site landfill for the CKD. The Company
understands that similar notices were sent to other cement manufacturers in the
State of Indiana. The Company is protesting this determination through legal
channels and has received a stay to allow it to demonstrate that current
management practices pose no threat to the environment. The Company believes
that the State's determination ultimately will be reversed or the Company will
receive the needed permit or other adequate relief, such as an agreed order
requiring certain additional waste management procedures that are less stringent
than those generally required for Type I wastes. If the Company is not
successful in this regard, however, like other Indiana cement producers, the
Greencastle plant could incur substantially increased operating and capital
costs.
 
     The Cape Girardeau, Missouri and Greencastle, Indiana plants, which are the
Company's two cement manufacturing facilities using HWF as a cost-saving energy
source, are subject to strict federal, state and local requirements governing
hazardous waste treatment, storage and disposal facilities, including those
contained in the federal Boiler and Industrial Furnace Regulations promulgated
under RCRA (the "BIF Rules"). The Company has secured the permit required under
RCRA and the BIF Rules for the Cape Girardeau plant, and the Greencastle plant
also will go through this permitting process and has completed a three-year
recertification of its existing interim status. The Greencastle permit is a
requirement to enable Lone Star to continue the use of HWF at the plant. The
permitting process is lengthy and complex, involving the submission of extensive
technical data, and there can be no assurances that the plant will be successful
in securing its final RCRA permit. In addition, if received, the permit could
contain terms and conditions with which the Company cannot comply or could
require the Company to install and operate costly control technology equipment.
While Lone Star believes that it is currently in compliance with the extensive
and complex technical requirements of the BIF Rules, there can be no assurances
that the Company will be able to maintain compliance with the BIF Rules or that
changes to such rules or their interpretation by the relevant agencies or courts
might not make it more difficult or cost-prohibitive to continue to burn HWF.
 
     The federal Comprehensive Environmental Response, Compensation and
Liability Act ("CERCLA" or "Superfund"), as well as many comparable state
statutes, creates a joint and several liability scheme for the
                                        6
<PAGE>   9
 
investigation and remediation of facilities where releases of hazardous
substances are found to have occurred. Liability may be imposed upon current
owners and operators of the facility, upon owners and operators of the facility
at the time of the release and upon generators and transporters of hazardous
substances released at the facility. While, as noted above, wastes produced by
the Company generally are not classified as hazardous wastes, many of the raw
materials, by-products and wastes currently and previously produced, used or
disposed of by the Company or its predecessors contain chemical elements or
components that have been designated as hazardous substances or which otherwise
may cause environmental contamination. Hazardous substances are or have been
used or produced by the Company in connection with its cement manufacturing
operations (e.g. grinding compounds, refractory bricks), quarrying operations
(e.g. blasting materials), equipment operation and maintenance (e.g. lubricants,
solvents, grinding aids, cleaning aids, used oils), and hazardous waste fuel
burning operations. Past operations of the Company have resulted in releases of
hazardous substances at sites currently or formerly owned by the Company and at
disposal sites owned by others. CKD and other materials were placed in depleted
quarries and other locations for many years. The Company has been named by the
EPA as a potentially responsible party for the investigation and remediation of
several Superfund sites, although it does not currently contemplate that future
costs relating to such sites will be material.
 
     The Company's operations are subject to federal and state laws and
regulations designed to protect worker health and safety. Worker protection at
the Company's cement manufacturing facilities is governed by the federal Mine
Safety and Health Act ("MSHA") and at other Company operations is governed by
the federal Occupational Safety and Health Act ("OSHA").
 
EMPLOYEES
 
     As of December 31, 1998, the Company had approximately 1,077 employees, of
which approximately 670 are hourly paid and located at the Company's various
operations. Except at certain distribution terminals and the New Orleans
facility, all hourly employees are represented by labor unions. There have been
no labor disruptions at any of the Company's facilities, and the Company
believes that its relationship with its employees generally has been good. The
agreements covering hourly-paid employees at the Cape Girardeau, Missouri plant
and at certain distribution terminals expire during the second half of 1999. The
Company does not anticipate any disruption of its operations in connection with
the renegotiation of these agreements; however, there can be no assurances in
this regard.
 
ITEM 2.  PROPERTIES.
 
     Lone Star's main operations are conducted at its plants and distribution
terminals described in Item 1 above. Lone Star owns its five portland cement
plants, its slag grinding and storage facility and a majority of the
distribution terminals supporting these plants. With respect to those
distribution terminals not owned, Lone Star holds a land lease for the
underlying real property and owns the facilities located on such property. There
is one additional distribution terminal that is leased to a third party. The
ready-mixed concrete plants are located on owned land or sites held under leases
for varying terms. No difficulty is anticipated in renewing leases as they
expire or finding satisfactory alternative sites. The Company leases executive
offices in Stamford, Connecticut and owns or leases certain sales and other
offices in various locations within its market areas in the United States.
 
ITEM 3.  LEGAL PROCEEDINGS.
 
     From time to time the Company is named as a defendant in lawsuits
asserting, among other things, products liability. The Company maintains such
liability insurance coverage for its operations as it deems reasonable. The
Company does not expect the effect of such matters to have a material effect on
the financial condition of the Company. For information concerning certain
environmental matters involving the Company, see "Business -- Environmental
Regulation".
 
ITEM 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS.
 
     Not applicable.
 
                                        7
<PAGE>   10
 
EXECUTIVE OFFICERS OF REGISTRANT
 
     The following table sets forth certain information regarding the executive
officers of the Company.
 
<TABLE>
<CAPTION>
NAME                                   AGE    OFFICE AND YEAR IN WHICH INDIVIDUAL FIRST BECAME AN EXECUTIVE OFFICER
----                                   ---    ---------------------------------------------------------------------
<S>                                    <C>    <C>
David W. Wallace.....................  75     Chairman of the Board (1991)
William M. Troutman..................  58     President and Chief Executive Officer (1983)
Roger J. Campbell....................  62     Vice President -- Cement Operations (1986)
William J. Caso......................  54     Vice President -- Taxes and Insurance (1994)
Thomas S. Hoelle.....................  47     Vice President -- General Manager, Slag Operations (1994)
Gerald F. Hyde, Jr. .................  56     Vice President -- Personnel and Labor Relations (1983)
James W. Langham.....................  39     Vice President, General Counsel and Secretary (1995)
Harry M. Philip......................  50     Vice President -- Cement Manufacturing (1994)
Michael W. Puckett...................  54     Vice President -- Cement Sales and Concrete Operations (1985)
William E. Roberts...................  59     Vice President, Chief Financial Officer, Controller and Treasurer
                                              (1988)
</TABLE>
 
     All of the executive officers' terms of office continue until the next
annual meeting of the Company's stockholders and until their successors have
been elected and qualified. All of the executive officers have been employed by
the Company as an officer or in an executive capacity for more than five years,
except for Mr. Langham, who for more than five years prior to joining the
Company was an attorney in New York City.
 
                                        8
<PAGE>   11
 
                                    PART II
 
ITEM 5. MARKET FOR THE REGISTRANT'S COMMON EQUITY AND RELATED
         STOCKHOLDER MATTERS.
 
     The Company's common stock and related purchase rights and its warrants are
listed on the New York Stock Exchange ("NYSE"). The following table sets forth
the high and low sales prices for the common stock and warrants in composite
transactions as reported on the NYSE as well as per share dividend information
relating to the common stock.
 
<TABLE>
<CAPTION>
                                       COMMON STOCK(I)               WARRANTS
                                ------------------------------    --------------
                                HIGH       LOW       DIVIDENDS    HIGH       LOW
                                ----       ---       ---------    ----       ---
<S>                             <C>        <C>       <C>          <C>        <C>
1997
     First Quarter............  $22 5/8    $17 7/16    $0.05      $28 5/8    $18 1/4
     Second Quarter...........   22 25/32   18 5/8      0.05       28         21
     Third Quarter............   27 1/8     22 5/8      0.05       36 1/2     28 1/2
     Fourth Quarter...........   30 5/8     24 7/16     0.05       43 3/8     31 3/4
 
1998
     First Quarter............  $34 13/16  $25 5/8     $0.05      $51 1/8    $33 1/2
     Second Quarter...........   42 7/16    33 1/4      0.05       66         48 1/4
     Third Quarter............   41 27/32   26 1/4      0.05       64 1/2     34 1/2
     Fourth Quarter...........   39 7/16    28          0.05       60         38 1/8
</TABLE>
 
---------------
(i) Common stock prices have been restated to reflect the Company's recent
    two-for-one stock split.
 
     The Company's financing agreements contain certain restrictive covenants
which, among other things, could have the effect of limiting the payment of
dividends and the repurchase of common stock and warrants. Approximately $54
million is currently available for such payments under the most restrictive of
such covenants. As of March 1, 1999, the Company had approximately 2,060 holders
of record of common stock and 2,857 holders of record of warrants.
 
                                        9
<PAGE>   12
 
ITEM 6.  SELECTED FINANCIAL DATA.
 
     The following selected financial data are derived from the Consolidated
Financial Statements of the Company. The data should be read in conjunction with
the Consolidated Financial Statements, related Notes and other financial
information included herein:
 
<TABLE>
<CAPTION>
                                                                                                     PREDECESSOR
                                                            SUCCESSOR COMPANY                          COMPANY
                                         --------------------------------------------------------    ------------
                                                                                     FOR THE NINE      FOR THE
                                                                                        MONTHS       THREE MONTHS
                                             FOR THE YEARS ENDED DECEMBER 31,           ENDED           ENDED
                                         -----------------------------------------   DECEMBER 31,     MARCH 31,
                                           1998       1997       1996       1995         1994            1994
(IN THOUSANDS EXCEPT PER SHARE AMOUNTS)    ----       ----       ----       ----     ------------    ------------
<S>                                      <C>        <C>        <C>        <C>        <C>             <C>
Net sales.........................       $347,065   $357,565   $367,673   $323,008     $261,645        $ 33,709
Net income (loss).................       $ 76,282   $ 65,413   $ 54,160   $ 35,762     $ 29,333        $(23,118)(3)
-----------------------------------------------------------------------------------------------------------------
EARNINGS PER COMMON SHARE(1):
Basic.............................       $   3.68   $   2.99   $   2.40   $   1.49     $   1.22             n/m(3)
Diluted...........................       $   2.88   $   2.44   $   2.04   $   1.40     $   1.22             n/m(3)
-----------------------------------------------------------------------------------------------------------------
WEIGHTED AVERAGE COMMON SHARES
  OUTSTANDING(1):
Basic.............................         20,745     21,881     22,581     23,981       24,000             n/m
Diluted...........................         26,516     26,857     26,493     25,483       24,088             n/m
-----------------------------------------------------------------------------------------------------------------
Shares outstanding at December 31(1)...    20,123     21,452     21,426     22,953       24,000             n/m
-----------------------------------------------------------------------------------------------------------------
Cash dividends per common share(1)...    $   0.10   $   0.10   $   0.10   $  0.075           --              --
-----------------------------------------------------------------------------------------------------------------
</TABLE>
 
<TABLE>
<CAPTION>
                                                            SUCCESSOR COMPANY
                                     ----------------------------------------------------------------
                                                         DECEMBER 31,
                                     ----------------------------------------------------   MARCH 31,
                                       1998       1997       1996       1995       1994       1994
                                       ----       ----       ----       ----       ----     ---------
<S>                                  <C>        <C>        <C>        <C>        <C>        <C>
FINANCIAL POSITION AT END OF
  PERIOD:
Total assets.......................  $588,514   $598,977   $562,151   $477,465   $553,320   $579,411
Long-term debt:
  Senior notes(2)..................  $ 50,000   $ 50,000   $ 50,000   $ 78,000   $ 78,000   $ 78,000
  Asset proceeds notes.............        --         --         --   $  4,399   $ 87,000   $112,000
Production payment.................        --         --         --         --   $ 19,966   $ 20,963
Common shareholders' equity........  $324,316   $333,634   $264,282   $159,740   $122,463   $ 93,313
</TABLE>
 
---------------
(1) Earnings per share, shares outstanding and cash dividends per share for
    prior years have been restated to reflect the two-for-one stock split
    effected in the form of a stock dividend in December 1998 (See Notes 1 and
    13 of Notes to Financial Statements).
 
(2) See Note 9 of Notes to Financial Statements.
 
(3) The Company adopted "fresh-start" reporting as of March 31, 1994.
    Accordingly, the Company's financial information presented for periods prior
    to March 31, 1994 is not comparable to that presented on or subsequent to
    March 31, 1994. A black line has been drawn to distinguish the
    pre-reorganization from the post-reorganization company. Earnings per share
    for the three months ended March 31, 1994 are not meaningful and are not
    comparable to the successor company per share amounts due to the emergence
    from Chapter 11 proceedings.
 
                                       10
<PAGE>   13
 
ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
        OF OPERATIONS.
 
FINANCIAL CONDITION
 
     The Company believes that cash and marketable securities on hand of $120.2
million and funds generated by operations will be adequate to cover current
working capital and capital expenditure needs.
 
     The Company's financing agreement and the revolving credit facility contain
certain restrictive covenants which, among other things, could have the effect
of limiting the payment of dividends and the repurchase of common stock and
warrants. Approximately $54.0 million is currently available for such payments
under the most restrictive of such covenants.
 
     During 1998, the Company purchased 2,823,400 shares and 179,400 warrants at
a cost of $98.6 million. Since the inception of its repurchase program in late
1995, the Company has purchased 6,544,100 shares and 179,400 warrants at a cost
of $160.3 million. The Company is currently authorized to purchase an additional
$40.0 million of common stock and warrants.
 
     In November 1998, the Board of Directors approved a two-for-one stock split
effected in the form of a 100% stock dividend. The additional shares were issued
on December 28, 1998 to stockholders of record at the close of business on
December 14, 1998. The Company intends to maintain its $0.05 per share quarterly
dividend, which will effectively double the amount of cash dividends the Company
pays to its stockholders.
 
Analysis of Cash Flows and Working Capital
 
     Cash flows from operating activities of $99.9 million for the year ended
December 31, 1998 primarily reflect income from operations and changes in
working capital. The utilization in 1998 of net operating loss carryforwards and
other deferred tax assets reduced cash taxes otherwise payable by $15.6 million.
At December 31, 1998, the Company had net operating loss carryforwards of
approximately $75.0 million and alternative minimum tax credits of $19.7
million, which are expected to reduce future cash taxes by an additional $46.0
million over time.
 
     During the year ended December 31, 1998, cash outflows from investing
activities were $47.4 million, primarily representing $52.1 million for capital
expenditures, offset by $4.7 million received for the sales of surplus parcels
of real estate and miscellaneous property and equipment.
 
     Net cash outflows from financing activities of $86.4 million for the year
ended December 31, 1998 primarily reflect the repurchase of 2.8 million shares
of common stock for $90.0 million, the purchase of warrants for $8.6 million and
$2.1 million of dividends paid. These cash outflows were partly offset by
proceeds of $14.1 million received from the exercise of warrants.
 
     Working capital on December 31, 1998 was $143.4 million as compared to
$169.6 million on December 31, 1997. Current assets decreased $27.1 million
primarily due to lower short-term investment balances, offset by higher accounts
and notes receivable and inventory balances. Current liabilities at December 31,
1998 were consistent with the prior year.
 
     The $16.1 million decrease in the Company's long-term deferred tax asset is
primarily due to the utilization of a portion of the tax assets in 1998.
Investments in joint ventures increased $1.2 million as the Company's share of
equity earnings exceeded cash distributions paid from Kosmos Cement Company. Net
property, plant and equipment increased $29.4 million reflecting capital
expenditures partly offset by depreciation.
 
Capital Expenditures
 
     In 1998, the Company invested $52.1 million in capital projects and expects
to spend an additional $103 million in 1999. The projects completed in 1998
include a 100,000-ton expansion at the Cape Girardeau, Missouri cement plant,
and the expansion of slag cement production capacity from 225,000 tons to
600,000 tons and the installation of a state-of-the-art ship and barge unloading
system at the New Orleans facility. In
 
                                       11
<PAGE>   14
 
addition, the Company expanded its Memphis, Tennessee distribution terminal and
constructed a slag cement distribution terminal in Atlanta, Georgia. Other
projects that were started in 1998 and are expected to be completed in 1999
include doubling the size of the existing distribution system at the New Orleans
facility by adding more than 50,000 tons of new storage capacity and
constructing another slag cement terminal in Northern Florida.
 
     New capital projects for 1999 include the expansion of the Greencastle,
Indiana cement plant that will increase the plant's production capacity by
600,000 tons to a total capacity of 1,350,000 tons. The $75 million plant
expansion is expected to be completed by mid-2000. In addition, the Company's
25% owned joint venture, Kosmos Cement Company, will expand and modernize its
Louisville, Kentucky cement plant. This project will increase the plant's
production capacity by 700,000 tons to approximately 1.6 million tons per year.
The $93 million project is expected to be completed in the year 2000. Both
projects are expected to provide future earnings growth from increased sales
volume and lower unit cement manufacturing costs.
 
     Additional capital projects for 1999 include the relocation of the Oglesby,
Illinois quarry. The project is expected to cost $18 million and be completed in
2001. The Company has started activities leading to designing, permitting and
constructing a second quarry near its cement plant at Cape Girardeau, Missouri.
This quarry is expected to be operational in 2002 or 2003, and the preliminary
estimate of the project's cost is $35 million. Eventually, this quarry will
become the Cape Girardeau plant's primary source of limestone. In conjunction
with this project, the Company has undertaken a study exploring the feasibility
of increasing the annual cement production capacity at this plant by one million
tons.
 
Other Information
 
     The Company is subject to extensive, stringent and complex federal, state
and local laws, regulations and ordinances pertaining to the quality and the
protection of the environment and human health and safety, requiring the Company
to devote substantial time and resources in an effort to maintain continued
compliance. Many of the laws and regulations apply to the Company's former
activities, properties and facilities as well as its current operations. There
can be no assurances that judicial or administrative proceedings, seeking
penalties or injunctive relief, will not be brought against the Company for
alleged non-compliance with applicable environmental laws and regulations
relating to matters as to which the Company is currently unaware. For instance,
if releases of hazardous substances are discovered to have occurred at
facilities currently or previously owned or operated by the Company, or at
facilities to which the Company has sent waste materials, the Company may be
subject to liability for the investigation and remediation of such sites. In
addition, changes to such regulations or the enactment of new regulations in the
future could require the Company to undertake capital improvement projects or to
cease or curtail certain operations or could otherwise substantially increase
the capital, operating and other costs associated with compliance (See Note 21).
 
     The Company believes that it has adequately provided for costs related to
its ongoing obligations with respect to known environmental liabilities.
Expenditures for environmental liabilities during 1998 did not have a material
effect on the financial condition or cash flows of the Company.
 
     During 1998, the collective bargaining agreements covering hourly-paid
employees at the Company's ready-mixed concrete division and at one of its
alternate fuels facilities were successfully renegotiated for four-year terms.
The agreements covering hourly-paid employees at the Cape Girardeau, Missouri
plant and at certain distribution terminals expire during the second half of
1999. The Company does not anticipate any disruption of its operations in
connection with the renegotiation of these agreements; however, there can be no
assurances in this regard.
 
Year 2000
 
     The Company is in the process of conducting a company-wide assessment of
its computer systems and operations to identify computer hardware and software
and process control systems that are not Year 2000 compliant. The Company
expects that the identification and repair of any problems will be successfully
completed during 1999. The Company's goal is to have its remediated and replaced
systems operational by the
 
                                       12
<PAGE>   15
 
end of the second quarter of 1999 to allow time for testing and verification. In
particular, the Company will perform tests of its cement plants' operations
during their normal maintenance shutdowns in the first half of 1999. Expenses
incurred to date have not been material, and the Year 2000 issue has had no
known effect on the Company to date. Future costs are not expected to be
material. Since 1990, the Company has been replacing and upgrading its corporate
and plant computer systems, including its maintenance tracking system, sales
order entry system, treasury system and other financial programs. The Company
has replaced all employee desktop computer systems within the past several
years. Such improvements have been made in the normal course of business.
Vendors have assured the Company that all of these recently purchased machines
and software programs are Year 2000 compliant.
 
     The Company has initiated communications with third parties such as
critical vendors and major service suppliers, communications providers and banks
whose system failures potentially could have a material impact on the Company.
No single customer accounts for more than 10% of the Company's total sales and
the Company has no executory contracts to sell cement that extend past December
31, 1999. Accordingly, the Company is not canvassing its customers as to their
Year 2000 compliance. There can be no guarantee that customer and vendor systems
will be Year 2000 compliant. Moreover, the potential effect of such
noncompliance cannot be quantified because of the impossibility of estimating
the magnitude, duration, or ultimate impact of noncompliance by others.
 
     If the Company is unsuccessful in identifying or fixing all Year 2000
problems in its critical operations, or if it is affected by the inability of
suppliers or customers to continue operations due to such a problem, the results
of operations or financial condition could be materially impacted. In the event
of the failure to correct all compliance issues related to manufacturing control
systems, the plants have the ability, in many instances, to continue operations
mechanically, rather than electronically. However, operations at a plant would
shut down if that plant's power suppliers failed to deliver electricity due to a
Year 2000 problem. Failure of other major third parties, such as coal and gas
suppliers and railroads, to correct Year 2000 problems could also affect the
Company's business.
 
     The Company anticipates developing a contingency plan that would be
designed to mitigate in part the impact on its business of certain Year 2000
problems. This plan, however, cannot cover all eventualities, such as a power
outage. The Company expects this plan to be in place by mid-1999.
 
Market Risk
 
     The Company does not enter into derivative or interest rate transactions.
In addition, the carrying value of other financial instruments, including cash
and cash equivalents, accounts and notes receivable, and accounts and notes
payable approximate fair value due to the short-term nature of their maturity.
The Company is exposed to interest rate changes primarily as a result of its
fixed rate senior notes and its variable rate revolving credit facility.
However, since the revolving credit facility has never been utilized by the
Company and due to the low level of outstanding debt at December 31, 1998, the
impact of interest rate changes on the Company's financial statements would not
be material.
 
Forward-Looking Statements
 
     This Management's Discussion and Analysis of Financial Condition and
Results of Operations and other sections of this annual report and Form 10-K
contain forward-looking statements within the meaning of Section 27A of the
Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934.
These forward-looking statements are based on current expectations, estimates
and projections concerning the general state of the economy and the industry and
market conditions in certain geographic locations in which the Company operates.
Words such as "expects", "anticipates", "intends", "plans", "believes",
"estimates" and variations of such words and similar expressions are intended to
identify such forward-looking statements. These statements are not guarantees of
future performance and involve certain risks, uncertainties and assumptions
which are difficult to predict. Therefore, actual results and outcomes may
differ materially from what is expressed or forecasted in such forward-looking
statements. The Company undertakes no obligation to update publicly any
forward-looking statements as a result of new information, future events or
other factors.
 
                                       13
<PAGE>   16
 
     The Company's business is cyclical and seasonal, the effects of which
cannot be accurately predicted (See "Business-Construction Industry Conditions"
of Item 1). Risks and uncertainties include changes in general economic
conditions (such as changes in interest rates), changes in economic conditions
specific to any one or more of the Company's markets (such as the strength of
local real estate markets and the availability of public funds for
construction), adverse weather, unexpected operational difficulties, changes in
governmental and public policy including increased environmental regulation, the
outcome of pending and future litigation, the successful negotiation of labor
contracts, unforeseen operational difficulties including difficulties relating
to the construction and installation of improvements to property, plant and
equipment, financial losses due to Year 2000 computer problems, and the
continued availability of financing in the amounts, at the times, and on the
terms required to support the Company's future business. Other risks and
uncertainties could also affect the outcome of the forward-looking statements.
 
RESULTS OF OPERATIONS
 
1998 COMPARED TO 1997
 
Net Sales
 
     Consolidated net sales of $347.1 million during 1998 were $10.5 million
lower than the prior-year results. The decrease in net sales primarily reflects
the sales of the Company's central Illinois ready-mixed concrete operations and
its New York construction aggregates operations during 1997. In each of the
years 1998 and 1997, the Company sold the approximate rated capacity of its
cement plants.
 
     Cement and ongoing ready-mixed concrete operations reported net sales of
$347.1 million for 1998 which were $29.8 million higher than 1997. This increase
is due to 4% higher average net realized cement selling prices in 1998 combined
with a 6% increase in cement shipments during the year. In 1998, the Company
shipped approximately 4.5 million tons of cement. The increase in shipments is
attributable to continued strong demand for cement in the Company's major
markets and mild weather conditions.
 
     The 1997 full year results include net sales of $40.3 million from the
construction aggregates and central Illinois ready-mixed concrete operations
which were sold in 1997.
 
     Net sales of cement and ready-mixed concrete and other construction
products were 94% and 6%, respectively, of total net sales in 1998.
 
Gross Profit
 
     Gross profit from the cement and ongoing ready-mixed concrete operations of
$124.9 million for 1998 was $13.5 million higher than 1997. The increase in
gross profit reflects higher average net realized cement and ready-mix selling
prices and higher overall shipments for the year. These results exclude gross
profit of $3.7 million for 1997 related to the Company's central Illinois
ready-mixed concrete operations and New York construction aggregates operations,
which were sold in 1997.
 
     Included in the calculation of gross profit are sales less cost of sales
including depreciation related to cost of sales (which excludes depreciation on
office equipment, furniture and fixtures which are not related to the cost of
sales).
 
Joint Ventures
 
     Pre-tax income from joint ventures of $8.2 million during 1998 reflects the
results of the Kosmos Cement Company, a partnership in which the Company has a
25% interest. The results for 1998 were $0.4 million lower than the prior year.
 
Other Income
 
     Other income of $10.6 million in 1998 increased $2.7 million from 1997,
primarily reflecting higher interest income earned on higher short-term
investment balances. Other income for the full year 1998 includes
 
                                       14
<PAGE>   17
 
gains totaling $3.3 million on the sale of two parcels of surplus real estate as
compared with a gain of $3.1 million from the sale of a surplus parcel of real
estate in 1997.
 
Selling, General and Administrative Expenses
 
     Selling, general and administrative expenses of $25.9 million during 1998
was $2.9 million lower than that of the prior-year, reflecting lower pension
expense, and lower expense related to the Company's central Illinois ready-mixed
concrete operations and its New York construction aggregates operations which
were sold in 1997.
 
Interest Expense
 
     Interest expense of $2.4 million in 1998 represents a decrease of $1.2
million over the prior-year expense. Capitalized interest of $1.4 million in
1998 was consistent with the prior-year amount. The reduction in interest
expense reflects the debt reduction and refinancing accomplished in March and
April of 1997.
 
Income Taxes
 
     The income tax expense of $38.9 million during 1998, an increase of $5.5
million from the prior-year expense, primarily reflects higher pre-tax earnings
in 1998.
 
Net Income
 
     Net income of $76.3 million during 1998 was $10.9 million higher than the
prior-year results. On a per share basis, basic and diluted earnings for 1998
were $3.68 and $2.88, respectively, compared to $2.99 and $2.44, respectively,
for 1997. This improvement is primarily due to higher average selling prices and
increased shipments of cement. Also contributing to the favorable increase in
net income for 1998 over the prior-year results were higher interest income
reflecting higher short-term investment balances, lower selling, general and
administrative expense and lower interest expense. These favorable results were
partly offset by increased income tax expense due to higher pre-tax earnings.
 
1997 COMPARED TO 1996
 
Net Sales
 
     Consolidated net sales of $357.6 million during 1997 were $10.1 million
lower than the prior-year results. The decrease in net sales primarily reflects
the dispositions of the Company's central Illinois ready-mixed concrete
operations and its New York construction aggregates operations during 1997.
 
     Cement and ongoing ready-mixed concrete operations reported net sales of
$317.2 million for 1997 which were $19.4 million higher than 1996. This increase
is due to 5% higher average net realized cement selling prices in 1997 combined
with a 2% increase in cement shipments during the year. In 1997, the Company
shipped more than 4.2 million tons of cement. The increase in shipments is
attributable to continued strong demand for cement in the Company's major
markets. These results exclude sales of $40.3 million and $69.7 million for 1997
and 1996, respectively, related to the Company's central Illinois ready-mixed
concrete and New York construction aggregates operations which were sold in
1997.
 
     Net sales of cement, construction aggregates and ready-mixed concrete and
other products were 83%, 11% and 6%, respectively, of total net sales in 1997.
 
Gross Profit
 
     Gross profit from the ongoing cement and ready-mixed concrete operations of
$111.4 million for 1997 was $14.1 million higher than 1996. The increase in
gross profit reflects higher average net realized cement and ready-mix selling
prices and higher overall shipments for the year. These results exclude gross
profit of $3.7 million for 1997 and $9.7 million for 1996 related to the
Company's central Illinois ready-mixed concrete and New York construction
aggregates operations which were sold in 1997.
 
                                       15
<PAGE>   18
 
Joint Ventures
 
     Pre-tax income from joint ventures of $8.6 million during 1997 reflects the
results of the Kosmos Cement Company, a partnership in which the Company has a
25% interest. The results for 1997 were $1.2 million higher than the prior year
reflecting higher net realized selling prices and higher shipments.
 
Other Income
 
     Other income of $7.9 million in 1997 increased $4.9 million from 1996,
primarily reflecting a gain of $3.1 million on the sale of a surplus parcel of
real estate and higher interest income earned on higher short-term investment
balances.
 
Selling, General and Administrative Expenses
 
     Selling, general and administrative expenses of $28.9 million during 1997
approximated the prior-year expense, reflecting lower pension expense and lower
expense related to the Company's central Illinois ready-mixed concrete
operations which were sold in March 1997 and its New York construction
aggregates operations which were sold in October 1997. These savings were offset
by higher selling and administrative expenses related to the Company's cement
operations.
 
Interest Expense
 
     Interest expense of $3.6 million in 1997 represents a decrease of $3.0
million over the prior-year expense. Capitalized interest was $1.4 million in
1997 and $1.3 million in 1996. The reduction in interest expense reflects the
Company's redemption of $28.0 million of its 10% senior notes in March 1997 and
the redemption of the remaining $50.0 million through a 7.31% private placement
in April 1997.
 
Income Taxes
 
     The income tax expense of $33.3 million during 1997, an increase of $5.7
million from the prior-year expense, primarily reflects higher pre-tax earnings
in 1997.
 
Net Income
 
     Net income of $65.4 million during 1997 was $11.3 million higher than the
prior-year results. On a per share basis, basic and diluted earnings for 1997
were $2.99 and $2.44, respectively, compared to $2.40 and $2.04, respectively,
for 1996. This improvement is primarily due to higher average selling prices and
increased shipments of cement. Also contributing to the favorable increase in
net income for 1997 over the prior-year results were a gain on the sale of
surplus real estate, higher interest income reflecting higher investment
balances, higher joint venture income and lower interest expense. These
favorable results were partly offset by increased income tax expense due to
higher pre-tax earnings.
 
ITEM 7A.  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK.
 
     See Item 7, "Management's Discussion and Analysis of Financial Condition
and Results of Operations -- Market Risk" for disclosures about market risk.
 
                                       16
<PAGE>   19
 
ITEM 8.  CONSOLIDATED FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA.
 
                           LONE STAR INDUSTRIES, INC.
 
                       INDEX TO FINANCIAL STATEMENTS AND
                          FINANCIAL STATEMENT SCHEDULE
 
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
Report of Independent Accountants...........................    18
 
Consolidated Financial Statements:
     Statements of Operations for the Years Ended December
      31, 1998, 1997 and 1996...............................    19
     Balance Sheets -- December 31, 1998 and 1997...........    20
     Statements of Changes in Common Shareholders' Equity
      for the Years Ended December 31, 1998, 1997 and
      1996..................................................    21
     Statements of Cash Flows for the Years Ended December
      31, 1998, 1997 and 1996...............................    22
     Notes to Financial Statements..........................    23
 
Schedule:
     II Valuation and Qualifying Accounts...................    43
 
Consent of Independent Accountants..........................    44
</TABLE>
 
     The foregoing supporting schedule should be read in conjunction with the
consolidated financial statements and notes thereto in this 1998 annual report
on Form 10-K.
 
     The presentation of individual condensed financial information of the
Company is omitted because the restricted net assets of the consolidated
subsidiaries do not exceed twenty-five percent of total consolidated net assets
at December 31, 1998 and 1997.
 
     Separate financial statements for the Company's fifty percent or less owned
affiliate are omitted because such subsidiary individually does not constitute a
significant subsidiary at December 31, 1998 and 1997.
 
     Schedules other than those listed above are omitted because the information
required is not applicable or is included in the financial statements or notes
thereto. Columns omitted from schedules filed are omitted because the
information is not applicable.
 
                                       17
<PAGE>   20
 
                       REPORT OF INDEPENDENT ACCOUNTANTS
 
TO THE BOARD OF DIRECTORS AND SHAREHOLDERS
LONE STAR INDUSTRIES, INC.
 
In our opinion, the consolidated financial statements listed in the accompanying
index present fairly, in all material respects, the financial position of Lone
Star Industries, Inc. and Subsidiaries at December 31, 1998 and 1997, and the
results of their operations and their cash flows for each of the three years in
the period ended December 31, 1998, in conformity with generally accepted
accounting principles. In addition, in our opinion, the financial statement
schedule listed in the accompanying index presents fairly, in all material
respects, the information set forth therein when read in conjunction with the
related consolidated financial statements. These financial statements and
financial statement schedule are the responsibility of the Company's management;
our responsibility is to express an opinion on these financial statements and
financial statement schedule based on our audits. We conducted our audits of
these statements in accordance with generally accepted auditing standards which
require that we plan and perform the audit to obtain reasonable assurance about
whether the financial statements are free of material misstatement. An audit
includes examining, on a test basis, evidence supporting the amounts and
disclosures in the financial statements, assessing the accounting principles
used and significant estimates made by management, and evaluating the overall
financial statement presentation. We believe that our audits provide a
reasonable basis for the opinion expressed above.
 
                                             PricewaterhouseCoopers LLP
 
Stamford, Connecticut
January 27, 1999
 
                                       18
<PAGE>   21
 
                           LONE STAR INDUSTRIES, INC.
 
                     CONSOLIDATED STATEMENTS OF OPERATIONS
 
<TABLE>
<CAPTION>
                                                       FOR THE        FOR THE        FOR THE
                                                      YEAR ENDED     YEAR ENDED     YEAR ENDED
                                                     DECEMBER 31,   DECEMBER 31,   DECEMBER 31,
                                                         1998           1997           1996
      (IN THOUSANDS EXCEPT PER SHARE AMOUNTS)        ------------   ------------   ------------
<S>                                                  <C>            <C>            <C>
Revenues:
  Net sales........................................    $347,065       $357,565       $367,673
  Joint venture income.............................       8,191          8,571          7,378
  Other income, net................................      10,601          7,923          3,007
                                                       --------       --------       --------
                                                        365,857        374,059        378,058
                                                       --------       --------       --------
Deductions from revenues:
  Cost of sales....................................     200,564        219,290        237,114
  Selling, general and administrative expenses.....      25,935         28,857         28,508
  Depreciation and depletion.......................      21,837         23,591         24,060
  Interest expense.................................       2,379          3,585          6,606
                                                       --------       --------       --------
                                                        250,715        275,323        296,288
                                                       --------       --------       --------
Income before income taxes.........................     115,142         98,736         81,770
Provision for income taxes.........................     (38,860)       (33,323)       (27,610)
                                                       --------       --------       --------
Net income applicable to common stock..............    $ 76,282       $ 65,413       $ 54,160
                                                       ========       ========       ========
Weighted average common shares outstanding:
  Basic............................................      20,745         21,881         22,581
                                                       ========       ========       ========
  Diluted..........................................      26,516         26,857         26,493
                                                       ========       ========       ========
Earnings per common share:
  Basic............................................    $   3.68       $   2.99       $   2.40
                                                       ========       ========       ========
  Diluted..........................................    $   2.88       $   2.44       $   2.04
                                                       ========       ========       ========
</TABLE>
 
   The accompanying Notes to Financial Statements are an integral part of the
                             Financial Statements.
                                       19
<PAGE>   22
 
                           LONE STAR INDUSTRIES, INC.
 
                          CONSOLIDATED BALANCE SHEETS
 
<TABLE>
<CAPTION>
                                                                    DECEMBER 31,
                                                                ---------------------
                                                                  1998         1997
                     (DOLLARS IN THOUSANDS)                       ----         ----
  <S>                                                           <C>          <C>
  ASSETS
  CURRENT ASSETS
  Cash, including cash equivalents of $119,896 in 1998 and
    $152,775 in 1997..........................................  $120,161     $154,080
  Accounts and notes receivable, net..........................    32,164       28,217
  Inventories.................................................    45,733       43,103
  Deferred tax asset..........................................     4,052        3,825
  Other current assets........................................     3,736        3,751
                                                                --------     --------
            TOTAL CURRENT ASSETS..............................   205,846      232,976
  Joint ventures..............................................    21,517       20,326
  Property, plant and equipment, net..........................   328,663      299,255
  Deferred tax asset..........................................    21,593       37,661
  Other assets and deferred charges...........................    10,895        8,759
                                                                --------     --------
            TOTAL ASSETS......................................  $588,514     $598,977
                                                                ========     ========
  LIABILITIES AND SHAREHOLDERS' EQUITY
  CURRENT LIABILITIES
  Accounts payable............................................  $ 16,087     $ 13,400
  Accrued liabilities.........................................    44,276       46,417
  Other current liabilities...................................     2,091        3,565
                                                                --------     --------
            TOTAL CURRENT LIABILITIES.........................    62,454       63,382
  Senior notes payable........................................    50,000       50,000
  Postretirement benefits other than pensions.................   123,428      123,728
  Other liabilities...........................................    28,316       28,233
  Contingencies (Notes 21 and 22)
                                                                --------     --------
            TOTAL LIABILITIES.................................   264,198      265,343
                                                                --------     --------
  Common stock, $1 par value. Authorized: 50,000,000 shares
    Shares issued: 1998 -- 25,691,546; 1997 -- 12,091,866.....    25,692       12,092
  Warrants to purchase common stock...........................    11,792       15,554
  Additional paid-in capital..................................   171,276      174,915
  Retained earnings...........................................   252,671      178,444
  Treasury stock, at cost.....................................  (137,115)     (47,371)
                                                                --------     --------
            TOTAL SHAREHOLDERS' EQUITY........................   324,316      333,634
                                                                --------     --------
            TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY........  $588,514     $598,977
                                                                ========     ========
</TABLE>
 
   The accompanying Notes to Financial Statements are an integral part of the
                             Financial Statements.
                                       20
<PAGE>   23
 
                           LONE STAR INDUSTRIES, INC.
 
                           CONSOLIDATED STATEMENTS OF
                     CHANGES IN COMMON SHAREHOLDERS' EQUITY
 
<TABLE>
<CAPTION>
                                                     FOR THE         FOR THE         FOR THE
                                                   YEAR ENDED      YEAR ENDED      YEAR ENDED
                                                  DECEMBER 31,    DECEMBER 31,    DECEMBER 31,
                                                      1998            1997            1996
                 (IN THOUSANDS)                   ------------    ------------    ------------
<S>                                               <C>             <C>             <C>
COMMON STOCK
Balance at beginning of period..................    $ 12,092        $ 12,087        $ 12,081
  December 1998 stock split.....................      12,092              --              --
  Exercise of warrants to purchase common
     stock......................................       1,508               5               6
                                                    --------        --------        --------
Balance at end of period........................      25,692          12,092          12,087
                                                    --------        --------        --------
WARRANTS TO PURCHASE COMMON STOCK
Balance at beginning of period..................      15,554          15,574          15,597
  Exercise of warrants to purchase common
     stock......................................      (2,941)            (20)            (23)
  Purchase of warrants..........................        (700)             --              --
  Other.........................................        (121)             --              --
                                                    --------        --------        --------
Balance at end of period........................      11,792          15,554          15,574
                                                    --------        --------        --------
ADDITIONAL PAID-IN CAPITAL
Balance at beginning of period..................     174,915         163,664          82,709
  December 1998 stock split.....................     (12,092)             --              --
  Exercise of warrants to purchase common
     stock......................................      15,568             116             122
  Purchase of warrants..........................      (7,884)             --              --
  Exercise of stock options, net of tax
     benefit....................................         (96)         (1,771)         (1,059)
  Reduction of tax valuation allowance..........          --          12,893          81,889
  Other.........................................         865              13               3
                                                    --------        --------        --------
Balance at end of period........................     171,276         174,915         163,664
                                                    --------        --------        --------
RETAINED EARNINGS
Balance at beginning of period..................     178,444         115,228          63,315
  Net income....................................      76,282          65,413          54,160
  Dividends.....................................      (2,055)         (2,197)         (2,247)
                                                    --------        --------        --------
Balance at end of period........................     252,671         178,444         115,228
                                                    --------        --------        --------
TREASURY STOCK
Balance at beginning of period..................     (47,371)        (42,271)        (13,962)
  Repurchase of shares..........................     (90,020)        (14,069)        (33,719)
  Stock options exercised.......................         243           8,944           5,399
  Other.........................................          33              25              11
                                                    --------        --------        --------
Balance at end of period........................    (137,115)        (47,371)        (42,271)
                                                    --------        --------        --------
TOTAL COMMON SHAREHOLDERS' EQUITY, END OF
  PERIOD........................................    $324,316        $333,634        $264,282
                                                    ========        ========        ========
</TABLE>
 
The accompanying Notes to Financial Statements are an integral part of the
Financial Statements.
                                       21
<PAGE>   24
 
                           LONE STAR INDUSTRIES, INC.
 
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
 
<TABLE>
<CAPTION>
                                                     FOR THE         FOR THE         FOR THE
                                                   YEAR ENDED      YEAR ENDED      YEAR ENDED
                                                  DECEMBER 31,    DECEMBER 31,    DECEMBER 31,
                                                      1998            1997            1996
                 (IN THOUSANDS)                   ------------    ------------    ------------
<S>                                               <C>             <C>             <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income......................................    $ 76,282        $ 65,413        $ 54,160
Adjustments to arrive at net cash provided by
  operating activities:
     Depreciation and depletion.................      21,837          23,591          24,060
     Tax benefit realized from utilization of
       deferred tax assets......................      15,617          25,147          25,419
     Changes in operating assets and
       liabilities:
          Accounts and notes receivable.........      (3,907)         (4,649)         (2,227)
          Inventories and other current
            assets..............................      (2,713)         (2,370)          3,713
          Accounts payable and accrued
            expenses............................      (1,219)          4,708             967
     Equity income, net of dividends received...      (1,191)           (821)          1,772
     Pension funding in excess of expense.......          --          (1,056)        (12,986)
     Gain on sale of a surplus property.........      (3,300)         (3,110)             --
     Other, net.................................      (1,524)            575           1,324
                                                    --------        --------        --------
Net cash provided by operating activities.......      99,882         107,428          96,202
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures............................     (52,125)        (41,977)        (42,640)
Proceeds from sales of assets...................       4,701          56,998             319
                                                    --------        --------        --------
Net cash (used) provided by investing
  activities....................................     (47,424)         15,021         (42,321)
 
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of long-term senior
  notes.........................................          --          50,000              --
Redemption of long-term senior notes............          --         (78,000)             --
Purchase of treasury stock......................     (90,020)        (14,069)        (33,719)
Proceeds from exercise of stock options.........         147           4,581           3,145
Purchase of warrants............................      (8,584)             --              --
Proceeds from exercise of warrants..............      14,135             101             106
Dividends paid..................................      (2,055)         (2,197)         (2,247)
                                                    --------        --------        --------
Net cash used by financing activities...........     (86,377)        (39,584)        (32,715)
                                                    --------        --------        --------
NET (DECREASE) INCREASE IN CASH AND CASH
  EQUIVALENTS...................................     (33,919)         82,865          21,166
Cash and cash equivalents, beginning of
  period........................................     154,080          71,215          50,049
                                                    --------        --------        --------
Cash and cash equivalents, end of period........    $120,161        $154,080        $ 71,215
                                                    ========        ========        ========
</TABLE>
 
The accompanying Notes to Financial Statements are an integral part of the
Financial Statements.
                                       22
<PAGE>   25
 
                         NOTES TO FINANCIAL STATEMENTS
 
1.  DESCRIPTION OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES
 
     Description of Operations -- The Company is a cement and ready-mixed
concrete company with operations in the United States (principally in the
Midwest and Southwest). Lone Star's cement operations consist of five cement
plants in the midwestern and southwestern regions of the United States, a slag
cement facility in Louisiana and a 25% interest in Kosmos Cement Company, a
partnership which operates one cement plant in each of Kentucky and
Pennsylvania. The five wholly-owned cement plants produced approximately 4.0
million tons of cement in 1998, which approximates the rated capacity of such
plants. The Company's construction aggregates operations, prior to its sale in
October 1997, primarily served the construction markets in the New York
metropolitan area. The ready-mixed concrete business operates in the Memphis,
Tennessee area and during 1996, in central Illinois (which operations were sold
in March 1997). The Company had approximately $347,100,000 in net sales in 1998,
with cement and ready-mixed concrete and other construction products operations
representing approximately 94% and 6%, respectively, of such net sales.
 
     Demand for cement is derived primarily from residential construction,
commercial and industrial construction, and public (infrastructure) construction
which are highly cyclical and are influenced by prevailing economic conditions
including interest rates and availability of public funds. Due to cement's low
value-to-weight ratio, the industry is largely regional and regional demand is
tied to local economic factors that may fluctuate more widely than those of the
nation as a whole.
 
     The markets for the Company's products are highly competitive and portland
cement is largely a commodity product. The Company competes with domestic and
international sources largely on the basis of price. To a lesser extent, other
competitive factors such as service, delivery time and proximity to customers
affect the Company's performance.
 
     Basis of Presentation -- The consolidated financial statements include the
accounts of Lone Star Industries, Inc. and all subsidiaries. All intercompany
transactions have been eliminated. The Company's joint venture is accounted for
using the equity method. Certain prior-period amounts have been reclassified to
conform with current-period presentation.
 
     In November 1998, the Company's Board of Directors authorized a two-for-one
stock split effected in the form of a 100% stock dividend. Shareholders' equity,
common stock and stock option activity for 1998 have been restated to give
retroactive recognition to the stock split. In addition, all references in the
financial statements and notes to financial statements, to weighted average
number of shares, per share amounts and market prices of the Company's common
stock have been restated to give retroactive recognition to the stock split.
 
     Upon emergence from its Chapter 11 proceedings in April 1994, the Company
adopted "fresh-start" reporting in accordance with AICPA Statement of Position
No. 90-7, "Financial Reporting by Entities in Reorganization Under the
Bankruptcy Code" ("SOP No. 90-7"), as of March 31, 1994. The Company's emergence
from these proceedings resulted in a new reporting entity with no retained
earnings or accumulated deficit as of March 31, 1994. Accordingly, the Company's
financial information shown for periods prior to March 31, 1994 is not
comparable to consolidated financial statements presented on or subsequent to
March 31, 1994.
 
     Cash and Cash Equivalents -- Cash equivalents include short-term, highly
liquid investments with original maturities of three months or less, and are
recorded at cost, which approximates market value.
 
     Inventories -- Inventories are stated at the lower of cost or market. Cost
is determined principally by the weighted average cost method.
 
     Property, Plant and Equipment -- Property, plant and equipment were stated
at fair market value as of March 31, 1994. Additions subsequent to March 31,
1994 are stated at cost. Property, plant and equipment are depreciated over the
estimated useful lives of the assets using the straight-line method. Useful
lives for
 
                                       23
<PAGE>   26
 
property, plant and equipment are as follows: buildings-10 to 40 years;
machinery and equipment-3 to 30 years; automobile and trucks-3 to 10 years.
Significant expenditures which extend the useful lives of existing assets are
capitalized. Maintenance and repair costs are charged to current earnings. Cost
depletion related to limestone reserves is calculated using the
units-of-production method. The cost of assets and related accumulated
depreciation is removed from the accounts when such assets are disposed of, and
any related gains or losses are reflected in current earnings.
 
     Income Taxes -- Deferred income taxes are provided for the temporary
differences between the financial reporting basis and the tax basis of the
Company's assets and liabilities. In accordance with SOP No. 90-7, income tax
benefits recognized from preconfirmation net operating loss carryforwards were
used first to reduce reorganization value in excess of amounts allocable to
identifiable assets and then to increase additional paid-in capital (See Notes 7
and 19).
 
     Pension Plans -- The Company and certain of its consolidated subsidiaries
have a number of retirement plans which cover substantially all of its
employees. Defined benefit plans for salaried employees provide benefits based
on employees' years of service and five-year final overall base compensation.
Defined benefit plans for hourly-paid employees, including those covered by
multi-employer pension plans under collective bargaining agreements, generally
provide benefits of stated amounts for specified periods of service. The
Company's policy is to fund at a minimum, amounts as are necessary on an
actuarial basis to provide assets sufficient to meet the benefits to be paid to
plan members in accordance with the requirements of the Employee Retirement
Income Security Act of 1974 ("ERISA"). Assets of the plans are administered by
an independent trustee and are invested principally in fixed income securities,
equity securities and real estate.
 
     Postretirement Benefits Other Than Pensions -- The Company provides retiree
life insurance and health plan coverage to qualifying employees. The Company
accounts for these benefits on an accrual basis, under the provisions of
Statement of Financial Accounting Standards No. 106, "Employers' Accounting for
Postretirement Benefits Other than Pensions". These plans are unfunded; however,
the Company makes defined quarterly contributions to the salaried retirees'
Voluntary Employees Beneficiary Association ("VEBA") trust per the settlement
agreement reached in the Company's bankruptcy proceedings (See Note 12).
 
     Earnings Per Common Share -- In December 1998, the Company issued a
two-for-one stock split effected in the form of a 100% stock dividend.
Previously reported share and earnings per share amounts have been restated.
Basic earnings per common share for the years ended December 31, 1998, 1997 and
1996 are calculated by dividing net income by weighted average common shares
outstanding during the period. Diluted earnings per common share for the years
ended December 31, 1998, 1997 and 1996 are calculated by dividing net income by
weighted average common shares outstanding during the period plus dilutive
potential common shares which are determined as follows:
 
<TABLE>
<CAPTION>
                                                    FOR THE YEARS ENDED DECEMBER 31,
                                                 --------------------------------------
                                                    1998          1997          1996
                                                    ----          ----          ----
<S>                                              <C>           <C>           <C>
Weighted average common shares...............    20,745,232    21,881,422    22,580,540
Effect of dilutive securities:
  Warrants...................................     5,550,858     4,734,450     3,315,326
  Options to purchase common stock...........       219,919       241,516       596,758
                                                 ----------    ----------    ----------
Dilutive potential common shares.............    26,516,009    26,857,388    26,492,624
                                                 ==========    ==========    ==========
</TABLE>
 
     Dilutive potential common shares are calculated in accordance with the
treasury stock method which assumes that proceeds form the exercise of all
warrants and options are used to repurchase common stock at market value. The
amount of shares remaining after the proceeds are exhausted represent the
potentially dilutive effect of the securities. The increasing number of warrants
used in the calculation is a result of the increasing market value of the
Company's common stock.
 
     Options to purchase 12,000 shares of common stock at $38.641 were
outstanding during the second half of 1998 and options to purchase 12,000 shares
of common stock at $17.15625 were outstanding during the
 
                                       24
<PAGE>   27
 
second half of 1996, but were not included in the computation of diluted
earnings per share because the options' exercise price was greater than the
average market price of the common shares.
 
     Environmental Matters -- Accruals for environmental matters are recorded
when it is probable that a liability has been incurred and the amount of the
liability can be reasonably estimated, or if an amount is likely to fall within
a range and no amount within that range can be determined to be the better
estimate, the minimum amount of the range is recorded. Accruals for
environmental matters exclude claims for recoveries from insurance carriers and
other third parties until it is probable that such recoveries will be realized.
 
     Recently Issued Accounting Pronouncements -- In June 1998, the Financial
Accounting Standards Board issued Statement of Financial Accounting Standards
No. 133, "Accounting for Derivative Instruments and Hedging Activities" ("SFAS
No. 133"). SFAS No. 133 establishes new accounting and reporting standards for
derivative financial instruments and for hedging activities. The statement is
effective for periods beginning after June 15, 1999. The Company does not expect
adoption of this statement to affect the Company's financial statements.
 
     Use of Estimates -- The preparation of financial statements in conformity
with generally accepted accounting principles requires management to make
estimates and assumptions that affect the reported amounts of assets and
liabilities and disclosure of contingent liabilities at the date of the
financial statements and revenue and expenses during the periods reported.
Estimates are used when accounting for allowance for uncollectable accounts
receivable, inventory obsolescence, depreciation, employee benefit plans,
environmental accruals, taxes and contingencies, among others. Actual results
could differ from these estimates.
 
2.  ACCOUNTS AND NOTES RECEIVABLE
 
     Receivables consist of the following (in thousands):
 
<TABLE>
<CAPTION>
                                                             DECEMBER 31,    DECEMBER 31,
                                                                 1998            1997
                                                             ------------    ------------
<S>                                                          <C>             <C>
Trade accounts and notes receivable........................    $33,458          $30,554
Other receivables..........................................      2,241            1,501
                                                               -------          -------
                                                                35,699           32,055
Less: allowance for doubtful accounts......................     (3,535)          (3,838)
                                                               -------          -------
                                                               $32,164          $28,217
                                                               =======          =======
</TABLE>
 
     Due to the nature of the Company's products, a majority of the Company's
accounts receivable are from businesses in the construction industry. Although
the Company's customer base is geographically diversified, collection of
receivables is partially dependent on the economics of the construction
industry.
 
3.  INVENTORIES
 
     Inventories consist of the following (in thousands):
 
<TABLE>
<CAPTION>
                                                             DECEMBER 31,     DECEMBER 31,
                                                                 1998             1997
                                                             ------------     ------------
<S>                                                          <C>              <C>
Finished goods.............................................     $15,228         $14,850
Work in process and raw materials..........................       6,657           6,417
Supplies and fuel..........................................      23,848          21,836
                                                                -------         -------
                                                                $45,733         $43,103
                                                                =======         =======
</TABLE>
 
                                       25
<PAGE>   28
 
4.  PROPERTY, PLANT AND EQUIPMENT
 
     Property, plant and equipment consists of the following (in thousands):
 
<TABLE>
<CAPTION>
                                                             DECEMBER 31,    DECEMBER 31,
                                                                 1998            1997
                                                             ------------    ------------
<S>                                                          <C>             <C>
Land.......................................................    $ 29,028        $ 29,680
Buildings and equipment....................................     334,641         295,891
Construction in progress...................................      21,179          15,028
Automobiles and trucks.....................................      33,636          27,649
                                                               --------        --------
                                                                418,484         368,248
Less accumulated depreciation and depletion................     (89,821)        (68,993)
                                                               --------        --------
                                                               $328,663        $299,255
                                                               ========        ========
</TABLE>
 
5.  INTEREST COSTS
 
     Interest costs incurred during the years ended December 31, 1998, 1997 and
1996 were $3,780,000, $5,027,000 and $7,931,000, respectively. Interest
capitalized during the years ended December 31, 1998, 1997 and 1996 was
$1,401,000, $1,442,000 and $1,325,000, respectively. Interest paid during the
years ended December 31, 1998, 1997 and 1996 was $3,760,000, $7,292,000 and
$7,931,000, respectively.
 
6.  KOSMOS CEMENT COMPANY
 
     The Company's investment in and advances to joint ventures at December 31,
1998 and 1997 consists of its 25% investment in Kosmos Cement Company
("Kosmos"). Kosmos is a partnership with cement plants in Kosmosdale, Kentucky
and Pittsburgh, Pennsylvania.
 
     The amount of cumulative unremitted earnings of joint ventures included in
consolidated retained earnings at December 31, 1998 was $3,892,000. During the
years ended December 31, 1998, 1997 and 1996, $7,000,000, $7,750,000 and
$9,150,000, respectively, of distributions were received from Kosmos.
 
     Summarized financial information of Kosmos as of and for the years ended
December 31, 1998, 1997 and 1996 is as follows (in thousands):
 
<TABLE>
<CAPTION>
                                                              AS OF AND FOR THE YEARS ENDED
                                                                       DECEMBER 31,
                                                             --------------------------------
                                                               1998        1997        1996
                                                               ----        ----        ----
<S>                                                          <C>         <C>         <C>
Current assets.............................................  $ 31,595    $ 30,341    $ 27,368
Property, plant and equipment, net.........................    75,902      73,098      74,038
Cost in excess of net assets of businesses acquired........    20,914      21,765      22,485
Current liabilities........................................    (6,013)     (4,581)     (4,893)
Other liabilities..........................................    (4,270)     (4,091)     (2,581)
                                                             --------    --------    --------
Net assets.................................................  $118,128    $116,532    $116,417
                                                             ========    ========    ========
Net sales..................................................  $100,274    $ 94,653    $ 88,300
Gross profit...............................................  $ 32,070    $ 33,484    $ 26,935
Net income.................................................  $ 29,596    $ 31,115    $ 26,345
</TABLE>
 
     At December 31, 1998, 1997 and 1996, the Company's share of the underlying
net assets of Kosmos Cement Company exceeded its investment by $8,015,000,
$8,807,000 and $9,600,000, respectively, and is being amortized over the
estimated remaining life of the assets.
 
     In late 1997, the State of Kentucky proposed a deficiency assessment
against Kosmos for severance tax payments related to limestone mined at a
Kentucky quarry. The total assessment is approximately $3,700,000, including
penalty and interest. Kosmos is contesting the assessment and met with the
Kentucky Revenue Cabinet in January 1998 to discuss the disputed assessments.
Discussions are still ongoing and Kosmos is unable to evaluate whether an
unfavorable outcome is either probable or remote. In addition to limestone mined
for the production of cement, Kosmos mines limestone specifically for use by a
local utility company. Kosmos believes that, under the terms of a supply
agreement, the utility is responsible for severance taxes on limestone provided
to it. A major portion of the Kentucky severance tax assessment relates to this
specifically mined limestone. For the amounts not paid by the local utility, the
Company would indirectly bear 25% of any settlement and legal costs through its
ownership interest in Kosmos.
 
                                       26
<PAGE>   29
 
7.  DEFERRED TAX ASSET
 
     As of December 31, 1995, the Company had various net deferred tax assets
made up primarily of the expected future tax benefit of net operating loss
carryforwards, various credit carryforwards and reserves not yet deductible for
tax purposes. A valuation allowance was provided in full against these net
deferred tax assets upon the Company's emergence from bankruptcy when
"fresh-start" reporting was adopted.
 
     During 1997 and 1996, the Company reduced the valuation allowance related
to the remaining net tax assets by $12,893,000 and $81,889,000, respectively.
The reduction reflects the Company's expectation that it is more likely than not
that it will generate future taxable income to utilize this amount of net
deferred tax assets. The benefit from this reduction was recorded as an increase
in additional paid-in capital in accordance with SOP No. 90-7.
 
     During 1998, 1997 and 1996, approximately $16,000,000, $25,000,000 and
$25,000,000, respectively, of net deferred tax assets were utilized.
 
8.  ACCRUED LIABILITIES
 
     Accrued liabilities consist of the following (in thousands):
 
<TABLE>
<CAPTION>
                                                             DECEMBER 31,    DECEMBER 31,
                                                                 1998            1997
                                                             ------------    ------------
<S>                                                          <C>             <C>
Payroll, vacation pay and other compensation...............    $ 6,669         $ 6,228
Postretirement benefits other than pensions................      6,225           7,563
Taxes other than income taxes..............................      3,348           3,480
Insurance..................................................      2,735           3,726
Interest...................................................      1,025           1,005
Other......................................................     24,274          24,415
                                                               -------         -------
                                                               $44,276         $46,417
                                                               =======         =======
</TABLE>
 
9.  SENIOR NOTES PAYABLE
 
     In April 1994, the Company issued $78,000,000 of ten-year senior unsecured
notes due July 31, 2003, which bore interest at a rate of 10% per annum. In
March 1997, the Company redeemed $28,000,000 of these senior notes and called
for the early redemption of the remaining $50,000,000 in the second quarter of
1997. In April 1997, the remaining $50,000,000 of the 10% senior notes were
redeemed at par plus accrued interest of $1,125,000.
 
     In March 1997, the Company issued $50,000,000 of 7.31% senior notes due in
2007. The note purchase agreement imposes certain operating and financial
restrictions on the Company. Such restrictions limit, among other things, the
ability of the Company to incur additional indebtedness, create liens, engage in
mergers and acquisitions, purchase the Company's capital stock and warrants or
pay dividends. Commencing in the year 2001, the Company is required to make
annual principal payments of $7,142,857.
 
10.  CREDIT AGREEMENT
 
     In March 1997, the Company entered into a $100,000,000 unsecured revolving
credit facility. Advances under this agreement bear interest at a rate which, at
the Company's option, is either prime or LIBOR plus 37.5 to 75 basis points. A
fee of 12.5 to 25 basis points is charged on the unused portion of the credit
line. The number of basis points used in both the LIBOR interest rate and the
commitment fee is determined by the Company's capital structure. The credit
agreement expires on April 30, 2002. Although the Company has used the letter of
credit facility provided by the credit agreement, it has never borrowed under
the credit agreement.
 
11.  LEASES
 
     Net rental expense for the years ended December 31, 1998, 1997 and 1996 was
$3,754,000, $3,593,000 and $3,344,000, respectively. Minimum rental commitments
under all non-cancelable leases principally pertaining to land, buildings and
equipment are as follows: 1999 -- $1,193,000; 2000 -- $1,006,000;
 
                                       27
<PAGE>   30
 
2001 -- $883,000; 2002 -- $869,000; 2003 -- $865,000; after 2003 -- $1,806,000.
Certain leases include options for renewal or purchase of leased property.
 
12.  EMPLOYEE BENEFIT PLANS
 
     Changes in benefit obligations and plan assets for pension and
postretirement obligations are as follows (in thousands):
 
<TABLE>
<CAPTION>
                                                                    POSTRETIREMENT
                                          PENSION BENEFITS             BENEFITS
                                        --------------------    ----------------------
                                            DECEMBER 31,             DECEMBER 31,
                                        --------------------    ----------------------
                                          1998        1997        1998         1997
                                          ----        ----        ----         ----
<S>                                     <C>         <C>         <C>          <C>
CHANGE IN BENEFIT OBLIGATION
Benefit obligation at beginning of
  year................................  $153,732    $144,968    $  94,308    $ 103,196
Service cost..........................     1,780       1,793        1,041        1,264
Interest cost.........................    10,303      10,489        6,329        7,364
Plan amendments.......................        --         194           --           --
Actuarial (gain) loss.................     2,523       7,175        2,454       (2,972)
Benefits paid.........................   (11,771)    (10,887)      (6,172)      (6,639)
Settlements...........................    (6,539)         --           --       (7,905)
                                        --------    --------    ---------    ---------
Benefit obligation at end of year.....   150,028     153,732       97,960       94,308
                                        --------    --------    ---------    ---------
CHANGE IN PLAN ASSETS
Fair value of plan assets at beginning
  of year.............................   192,954     172,715           --           --
Actual return on plan assets..........    15,078      29,361           --           --
Employer contribution.................        --       1,765        6,171        6,639
Employee contribution.................        --          --          109           65
Benefits paid.........................   (11,771)    (10,887)      (6,280)      (6,704)
Settlements...........................    (6,539)         --           --           --
                                        --------    --------    ---------    ---------
Fair value of plan assets at end of
  year................................   189,722     192,954           --           --
                                        --------    --------    ---------    ---------
 
Funded status.........................    39,694      39,222      (97,960)     (94,308)
Unrecognized net actuarial gain.......   (38,330)    (42,039)     (31,693)     (36,983)
Unrecognized prior service cost.......     3,817       4,190           --           --
                                        --------    --------    ---------    ---------
Prepaid (accrued) benefit cost........  $  5,181    $  1,373    $(129,653)   $(131,291)
                                        ========    ========    =========    =========
</TABLE>
 
     All of the Company's pension plans are overfunded as of December 31, 1998
and 1997. None of the Company's postretirement benefit plans are funded.
 
<TABLE>
<CAPTION>
                                                            PENSION       POSTRETIREMENT
                                                            BENEFITS         BENEFITS
                                                          ------------    --------------
                                                          DECEMBER 31,     DECEMBER 31,
                                                          ------------    --------------
                                                          1998    1997    1998     1997
                                                          ----    ----    -----    -----
<S>                                                       <C>     <C>     <C>      <C>
WEIGHTED-AVERAGE ASSUMPTIONS AS OF DECEMBER 31
Discount rate...........................................  6.75%   7.00%   6.75%    7.00%
Expected return on plan assets..........................  8.00    8.00    8.00     8.00
Rate of compensation increase...........................  4.50    4.50    4.50     4.50
</TABLE>
 
                                       28
<PAGE>   31
 
<TABLE>
<CAPTION>
                                            PENSION BENEFITS            POSTRETIREMENT BENEFITS
                                     ------------------------------   ---------------------------
                                           FOR THE YEAR ENDED             FOR THE YEAR ENDED
                                              DECEMBER 31,                   DECEMBER 31,
                                     ------------------------------   ---------------------------
                                       1998       1997       1996      1998      1997      1996
                                       ----       ----       ----      ----      ----      ----
<S>                                  <C>        <C>        <C>        <C>       <C>       <C>
COMPONENTS OF NET PERIODIC BENEFIT
  COST
Service cost.......................  $  1,780   $  1,793   $  1,938   $ 1,041   $ 1,264   $ 1,603
Interest cost......................    10,303     10,489     10,214     6,329     7,364     7,618
Expected return on plan assets.....   (13,442)   (11,762)   (10,140)       --        --        --
Amortization of prior service
  cost.............................       374        382        356        --        --        --
Recognized net actuarial gain......      (777)      (332)        --    (2,836)   (2,575)   (1,783)
                                     --------   --------   --------   -------   -------   -------
Net periodic benefit (income)
  cost.............................  $ (1,762)  $    570   $  2,368   $ 4,534   $ 6,053   $ 7,438
                                     ========   ========   ========   =======   =======   =======
</TABLE>
 
     In 1997, the Company recorded a $7,905,000 postretirement settlement gain
related to the sale of the Company's New York construction aggregates
operations.
 
     For measurement purposes, a 9.5% annual medical rate of increase is assumed
for 1999 for both pre-medicare and post-medicare claims; the rate is assumed to
decrease  1/2% each year to 6% per year after 2005. The health care cost trend
rate assumption has a significant effect on the amounts reported for the health
care plans. To illustrate, a one-percentage-point change in assumed health care
cost trend rates would have the following effects (in thousands):
 
<TABLE>
<CAPTION>
                                               1-PERCENTAGE-POINT             1-PERCENTAGE-POINT
                                                    INCREASE                       DECREASE
                                           ---------------------------    ---------------------------
<S>                                        <C>                            <C>
Effect on total of service and interest
  cost components........................            $  558                         $  (401)
Effect on postretirement benefit
  obligation.............................            $5,235                         $(5,862)
</TABLE>
 
     Certain union employees are covered under union sponsored multi-employer
pension plans pursuant to collective bargaining agreements. Multi-employer
pension expenses and contributions to the plans in the years ended December 31,
1998, 1997 and 1996, were approximately $130,000, $140,000 and $300,000,
respectively.
 
     As part of its emergence from Chapter 11 proceedings, the Company reached
settlements with the salaried and union retirees with respect to reductions and
modifications of retiree medical and life insurance benefits. As part of the
settlement with salaried retirees, the Company established a Voluntary Employees
Beneficiary Association ("VEBA"), a tax-exempt trust, and agreed to make defined
quarterly contributions to the trust. The Company has the option to prepay all
future quarterly contributions to the VEBA in a single cash amount equal to 110%
of the discounted present value (using an 8.5% discount factor) of all future
quarterly contributions. The Company made contributions of $4,318,000,
$4,425,000 and $4,428,000 to the VEBA during the years ended December 31, 1998,
1997 and 1996, respectively.
 
                                       29
<PAGE>   32
 
13.  COMMON STOCK
 
     The Company has authorized 50,000,000 shares of $1.00 par value common
stock. Transactions in common stock are as follows:
 
<TABLE>
<CAPTION>
                                                                COMMON     TREASURY
                                                                SHARES      SHARES
                                                                ------     --------
<S>                                                           <C>          <C>
Balance, December 31, 1995..................................  12,080,844     604,157
  Exercise of warrants......................................       5,666          --
  Exercise of options.......................................          --    (204,565)
  Purchase of shares........................................          --     974,317
  Stock issued under compensation plans.....................          --        (400)
                                                              ----------   ---------
Balance, December 31, 1996..................................  12,086,510   1,373,509
  Exercise of warrants......................................       5,356          --
  Exercise of options.......................................          --    (290,500)
  Purchase of shares........................................          --     283,800
  Stock issued under compensation plans.....................          --        (800)
                                                              ----------   ---------
Balance, December 31, 1997..................................  12,091,866   1,366,009
  Effect of 2-for-1 stock split in December 1998............  12,091,866   1,366,009
  Exercise of warrants......................................   1,507,814          --
  Exercise of options.......................................          --     (14,100)
  Purchase of shares........................................          --   2,823,390
  Stock issued under compensation plans.....................          --      (1,600)
  Return of shares from Chapter 11 distribution agent.......          --      29,144
                                                              ----------   ---------
Balance, December 31, 1998..................................  25,691,546   5,568,852
                                                              ==========   =========
</TABLE>
 
     At December 31, 1998, the Company has reserved 9,389,006 shares of its
authorized but unissued common stock for possible future issuance in connection
with the exercise of the warrants to purchase common stock (6,047,606 shares)
and the exercise of stock options (3,341,400 shares).
 
     Since the second quarter of 1995, the Company has paid a $0.05 per share
quarterly cash dividend. In addition, on February 18, 1999, the Board of
Directors declared a $0.05 dividend per common share, payable on March 15, 1999
to shareholders of record as of March 1, 1999. The Company's financing
agreements and the revolving credit facility contain certain restrictive
covenants which, among other things, could have the effect of limiting the
payment of dividends and the repurchase of common stock and warrants.
Approximately $54,000,000 is currently available for such payments under the
most restrictive of such covenants (See Notes 9 and 10).
 
     On November 19, 1998, the Company's Board of Directors authorized a
two-for-one stock split effected in the form of a 100% stock dividend to
shareholders of record on December 14, 1998, to be distributed on December 28,
1998. Shareholders' equity for 1998 has been restated to give retroactive
recognition to the stock split. In addition, all references in the financial
statements and accompanying notes to financial statements, to weighted average
number of shares, 1998 stock activity, per share amounts, 1998 stock option data
and market prices of the Company's common stock have been restated.
 
     As part of a stock repurchase program, in 1998 the Company purchased
1,912,200 shares of treasury stock in open market transactions for $59,856,000
and purchased 911,190 shares of its common stock in private transactions for
$30,164,000. In 1997 the Company purchased 283,800 shares of treasury stock in
open market transactions for $14,069,000. In 1996, the Company purchased 272,401
shares of treasury stock in open market transactions for $8,457,000 and
purchased 700,000 shares of its common stock in private transactions for
$25,200,000. An additional 1,916 shares were received, in lieu of cash, by the
Company in connection with the exercise of certain employee stock options.
 
                                       30
<PAGE>   33
 
     In January 1998, pursuant to an order signed by the U.S. Bankruptcy Court,
29,144 shares of common stock were returned to the Company from the Chapter 11
distribution agent. These shares were recorded as treasury shares and had no
effect on total equity of the Company.
 
     In February 1999, the Company announced a program which will provide
shareholders owning fewer than 100 shares of common stock the opportunity to
sell all of their shares to the Company. The program is to run from February 5,
1999 through March 8, 1999, unless extended by the Company. The purchase price
under the program will be equal to the average of the closing market prices of
the Company's common stock for all trading days during the period the program is
in effect.
 
14.  WARRANTS TO PURCHASE COMMON STOCK
 
     In April 1994, the Company issued 4,003,333 warrants to purchase common
stock at an exercise price of $18.75 per share. The number of shares of common
stock purchasable upon the exercise of each warrant and the exercise price of
the warrant are subject to adjustment if the Company (i) pays a dividend in
shares of common stock, (ii) subdivides its outstanding shares of common stock,
(iii) combines its outstanding shares of common stock into a smaller number of
shares of common stock, or issues by reclassification or recapitalization of its
shares of common stock, other securities of the Company or (iv) issues certain
stock rights convertible into, or exchangeable for, common stock. An adjustment
will not result from the Company's sale of common stock on the open market or
from the declaration of regular cash dividends. The warrants are non-callable,
non-redeemable and expire on December 31, 2000. As of December 31, 1998, there
were 3,023,803 warrants outstanding.
 
     In December 1998, the Company issued a two-for-one stock split effected in
the form of a 100% stock dividend. The stock split increased the number of
shares of common stock a warrant holder is entitled to purchase from one to two
at $9.375 per share. In 1998, the Company purchased 179,405 of its warrants in
private transactions for $8,584,000.
 
     In January 1998, pursuant to an order signed by the U.S. Bankruptcy Court,
31,033 warrants were returned to the Company from the Chapter 11 distribution
agent. The returned warrants were cancelled.
 
15.  STOCKHOLDER RIGHTS PLAN
 
     In November 1994, the Board of Directors adopted a Stockholder Rights Plan
("rights plan") under which stock purchase rights were distributed as a dividend
to holders of common stock payable to the shareholders of record on December 19,
1994. Management believes that the rights plan represents a means of deterring
abusive and coercive takeover tactics not offering an adequate price to all
stockholders, and seeks to ensure that stockholders realize the long-term value
of their investments.
 
     The rights plan provides that if, subject to certain exemptions, any person
or group acquires 15% or more of the Company's common stock, each right not
owned by the 15% or more stockholder or related parties will entitle its holder
to purchase, at the right's then current exercise price, shares of common stock
having a value of twice the right's then current exercise price. This right to
purchase common stock at a discount will not be triggered by a person's or
group's acquisition of 15% or more of the common stock pursuant to a tender or
exchange offer which is for all outstanding shares at a price and on terms that
the Board of Directors determines (prior to acquisition) to be adequate and in
the best interests of the Company and its stockholders.
 
     Under the rights plan, holders of the rights will initially be entitled to
buy one-tenth of a share of the Company's common stock at an exercise price of
$35.00 (which was adjusted from $70.00 as a result of the Company's recent
two-for-one stock split) for each whole share which a holder of rights may
purchase. Until a person or group acquires 15% or more of the common stock or
commences a tender or exchange offer for 15% or more of the common stock, the
rights will attach to and trade with the common stock. As a result, each of the
new shares issued in the two-for-one stock split included one right. The rights
will expire in the year 2004.
 
     The Company may redeem the rights, at the option of the Board of Directors,
at a redemption price of $0.01 per right at any time prior to the acquisition by
any person or group of 15% or more of the common stock. In addition, after a
person or group has acquired 15% or more of the common stock but before any
                                       31
<PAGE>   34
 
person or group has acquired 50% or more of the common stock, the Company may
exchange shares of common stock for rights.
 
16.  STOCK COMPENSATION PLANS
 
     At December 31, 1998, the Company had three stock-based compensation plans,
which are described below. As of January 1, 1996, the Company adopted Statement
of Financial Accounting Standards No. 123, "Accounting for Stock-Based
Compensation" ("SFAS No. 123"). The Company has chosen to continue to apply
Accounting Principles Board Opinion No. 25, "Accounting for Stock Issued to
Employees" and related interpretations in accounting for its plans. Accordingly,
no compensation cost has been recognized for its stock option plans. Had
compensation cost for the Company's stock-based compensation plans been
determined consistent with SFAS No. 123, the Company's net income for the years
ended December 31, 1998, 1997 and 1996 would have been $76,165,000, $65,347,000
and $54,082,000, respectively. Pro forma basic and diluted earnings per share
for the years ended December 31, 1998, 1997 and 1996 would have been $3.67,
$2.99 and $2.40, and $2.87, $2.43 and $2.04, respectively. The pro forma effect
of stock option grants on net income for 1998, 1997 and 1996 may not be
representative of the pro forma effect on net income in future years due to the
small number of options granted during 1998, 1997 and 1996 and the exclusion of
option grants made prior to 1995.
 
     The fair value of each option grant is estimated on the date of grant using
the Black-Scholes option-pricing model with the following weighted-average
assumptions used for grants in 1998, 1997, 1996, 1995 (Directors Plan) and 1995
(Management Plan), respectively: dividend yield of 0.52, 0.52, 0.58, 0.96 and
0.93 percent; expected volatility of 43, 31, 28, 23 and 27 percent; risk-free
interest rates of 4.77, 5.44, 6.29, 5.30 and 5.30 percent; and expected lives of
4 years for all grants.
 
     Under the Management Stock Option Plan ("Management Plan"), the Company has
granted options to its employees for 1,400,000 shares of common stock. Under the
Directors Stock Option Plan ("Directors Plan"), the Company may grant options to
its Directors for up to 100,000 shares of common stock. Under the 1996 Long Term
Incentive Plan ("Incentive Plan"), the Company may grant up to 3,000,000 stock
options and/or stock appreciation rights to its employees. No options were
granted under the Incentive Plan in 1998, 1997 or 1996. Under all plans, the
exercise price of each option must be equal to or greater than the market price
of the Company's stock on the date of grant, and an option's maximum term is ten
years. Options granted under the Management Plan vest over a three-year period
and options granted under the Directors Plan become vested after six months.
Options granted under the Incentive Plan become vested after a minimum of one
year from the grant date.
 
                                       32
<PAGE>   35
 
     A summary of the status of the Company's Management and Directors Plans as
of and for the years ended December 31, 1998, 1997 and 1996 is presented below:
 
<TABLE>
<CAPTION>
                                                    WEIGHTED-
                                                     AVERAGE
                                                    EXERCISE       OPTIONS        OPTIONS
                                                      PRICE      OUTSTANDING    EXERCISABLE
                                                    ---------    -----------    -----------
<S>                                                 <C>          <C>            <C>
Balance, December 31, 1995........................  $15.6700       634,815        404,073
  Options granted.................................  $34.3130         6,000             --
  Options exercised...............................  $15.3750      (204,565)      (204,565)
  Options which became exercisable................  $16.5980            --        124,242
                                                                  --------       --------
Balance, December 31, 1996........................  $16.0650       436,250        323,750
  Options granted.................................  $38.3750         6,000             --
  Options exercised...............................  $15.7700      (290,500)      (290,500)
  Options which became exercisable................  $16.9450            --        112,250
                                                                  --------       --------
Balance, December 31, 1997........................  $17.5100       151,750        145,500
  Effect of 2-for-1 stock split in December
     1998.........................................                 151,750        145,500
  Options granted.................................  $38.6405        12,000             --
  Options exercised...............................  $10.4025       (14,100)       (14,100)
  Options which became exercisable................  $24.4107            --         24,500
                                                                  --------       --------
Balance, December 31, 1998........................  $ 9.8680       301,400        301,400
                                                                  ========       ========
</TABLE>
 
     Options available for future grants under the Directors Plan were 40,000
and 26,000 (pre-split) at December 31, 1998 and 1997, respectively. Options
available for future grants under the Incentive Plan were 3,000,000 and
1,500,000 (pre-split) at December 31, 1998 and 1997, respectively.
 
     The following table summarizes information about stock options outstanding
at December 31, 1998:
 
<TABLE>
<CAPTION>
                                                                  WEIGHTED-AVERAGE
                               DECEMBER 31, 1998       ---------------------------------------
                           -------------------------    REMAINING     OPTION EXERCISE PRICES
                             NUMBER        NUMBER      CONTRACTUAL   -------------------------
RANGE OF EXERCISE PRICES   OUTSTANDING   EXERCISABLE      LIFE       OUTSTANDING   EXERCISABLE
------------------------   -----------   -----------   -----------   -----------   -----------
<S>                        <C>           <C>           <C>           <C>           <C>
 $7.6875-$7.84375            253,400       253,400       5.5 years    $ 7.6949      $ 7.6949
     $10.3750                 12,000        12,000       7.0 years    $10.3750      $10.3750
     $17.1565                 12,000        12,000       7.5 years    $17.1565      $17.1565
     $19.1875                 12,000        12,000       8.5 years    $19.1875      $19.1875
     $38.6405                 12,000        12,000       9.5 years    $38.6405      $38.6405
                             -------       -------
                             301,400       301,400
                             =======       =======
</TABLE>
 
17.  DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
 
     In accordance with Statement of Financial Accounting Standards No. 107,
"Disclosures about Fair Value of Financial Instruments", the fair value of a
financial instrument is the amount at which the instrument could be exchanged in
a current transaction between willing parties. The following table presents the
carrying amounts and estimated fair values of the Company's financial
instruments at December 31, 1998 (in thousands).
 
<TABLE>
<CAPTION>
                                                          DECEMBER 31, 1998
                                                         --------------------
                                                         CARRYING      FAIR
                                                          AMOUNT      VALUE
                                                         --------     -----
<S>                                                      <C>         <C>
Financial assets:
  Cash and cash equivalents............................  $120,161    $120,161
Financial liabilities:
  Senior notes payable.................................  $ 50,000    $ 50,652
</TABLE>
 
                                       33
<PAGE>   36
 
     The carrying amounts shown in the table are included in the accompanying
consolidated balance sheet under the indicated captions.
 
     The following methods and assumptions were used to estimate the fair value
of each class of financial instruments for which it is practicable to estimate
that value:
 
     Cash and cash equivalents -- the carrying amount approximates fair value
because of the short maturity of those instruments.
 
     Senior notes payable -- the fair value of this privately-placed long-term
debt is based on the change in the fair value of similar issues of publicity
traded debt.
 
18.  OTHER INCOME, NET
 
     Other income, net, consists of the following (in thousands):
 
<TABLE>
<CAPTION>
                                                              FOR THE YEARS ENDED
                                                                 DECEMBER 31,
                                                          ---------------------------
                                                           1998       1997      1996
                                                           ----       ----      ----
<S>                                                       <C>        <C>       <C>
Interest income on investments..........................  $ 7,674    $4,892    $2,552
Gain on sale of surplus property........................    3,300     3,110        --
Other, net..............................................     (373)      (79)      455
                                                          -------    ------    ------
                                                          $10,601    $7,923    $3,007
                                                          =======    ======    ======
</TABLE>
 
19.  INCOME TAXES
 
     Provision for income taxes consists of the following (in thousands):
 
<TABLE>
<CAPTION>
                                                            FOR THE YEARS ENDED
                                                                DECEMBER 31,
                                                       ------------------------------
                                                        1998       1997        1996
                                                        ----       ----        ----
<S>                                                    <C>        <C>        <C>
Federal income tax provision:
  Current..........................................    $21,166    $ 7,301    $  1,314
                                                       -------    -------    --------
  Deferred:
     Difference between tax and book
       depreciation................................        717      1,008       3,402
     Sale of assets................................        122       (918)      2,467
     Alternative minimum tax and other credits.....     (5,375)    (7,301)      1,139
     Net operating loss carryforward...............     14,246     22,151       8,453
     Other reserves................................      2,883      7,132       6,204
     Change in valuation allowance.................         --     (9,346)    (75,109)
     Other, net....................................     (1,628)    (1,656)      3,543
                                                       -------    -------    --------
  Total deferred...................................     10,965     11,070     (49,901)
                                                       -------    -------    --------
  Increase in additional paid-in capital...........         --      9,346      71,289
                                                       -------    -------    --------
Total federal income tax provision.................     32,131     27,717      22,702
                                                       -------    -------    --------
State and local income tax provision:
  Current..........................................      2,077        875         877
  Deferred.........................................      4,652      4,731       4,031
  Change in valuation allowance....................         --     (3,547)    (10,600)
  Increase in additional paid-in capital...........         --      3,547      10,600
                                                       -------    -------    --------
Total state and local income tax provision.........      6,729      5,606       4,908
                                                       -------    -------    --------
Provision for income taxes.........................    $38,860    $33,323    $ 27,610
                                                       =======    =======    ========
</TABLE>
 
                                       34
<PAGE>   37
 
     As of December 31, 1998, the Company has regular tax net operating loss
carryforwards of approximately $75,000,000 that expire at various dates through
2009 and an alternative minimum tax credit carryforward of $19,700,000. The
Internal Revenue Code of 1986, as amended (the "Code"), imposes limitations
under certain circumstances on the use of carryforwards upon the occurrence of
an "ownership change" (as defined in Section 382 of the Code). An "ownership
change" resulted from the issuance of equity securities by the Company as part
of its plan of reorganization. Such an "ownership change" limits the use of a
portion of the Company's carryforwards in any one year. The Company believes it
is more likely than not that all of its carryforwards will be utilized prior to
their expiration.
 
     The following is a schedule of consolidated pre-tax income and a
reconciliation of income taxes computed at the U.S. statutory rate to the
provision for income taxes (in thousands):
 
<TABLE>
<CAPTION>
                                                            FOR THE YEARS ENDED
                                                                DECEMBER 31,
                                                       ------------------------------
                                                         1998       1997       1996
                                                         ----       ----       ----
<S>                                                    <C>         <C>        <C>
Income before income taxes.........................    $115,142    $98,736    $81,770
                                                       --------    -------    -------
Tax provision computed at statutory rates..........      40,300     34,558     28,620
 
Differences resulting from:
  State tax, net...................................       4,375      3,669      3,190
  Other, including percentage depletion............      (5,815)    (4,904)    (4,200)
                                                       --------    -------    -------
Provision for income taxes.........................    $ 38,860    $33,323    $27,610
                                                       ========    =======    =======
</TABLE>
 
     Components of net deferred tax assets as of December 31, 1998 and 1997 are
as follows (in thousands):
 
<TABLE>
<CAPTION>
                                                             DECEMBER 31,    DECEMBER 31,
                                                                 1998            1997
                                                             ------------    ------------
<S>                                                          <C>             <C>
Current tax assets related to:
  Reserves not yet deducted................................    $  4,052        $  3,825
                                                               --------        --------
Non-current tax assets related to:
  Reserves not yet deducted................................       4,773           2,744
  Reserve for retiree benefits.............................      42,777          42,893
  Loss carryforwards.......................................      26,353          40,252
  Alternative minimum tax and other credits................      19,660          18,849
  Net state................................................         774           3,888
                                                               --------        --------
                                                                 94,337         108,626
Non-current tax liabilities related to:
  Fixed assets.............................................     (58,239)        (53,320)
  Other....................................................     (11,056)        (14,490)
  Domestic joint ventures..................................      (3,449)         (3,155)
                                                               --------        --------
                                                                (72,744)        (70,965)
                                                               --------        --------
Total long-term net deferred tax assets....................      21,593          37,661
                                                               --------        --------
Total net deferred tax assets..............................    $ 25,645        $ 41,486
                                                               ========        ========
</TABLE>
 
     Net income taxes paid during the years ended December 31, 1998, 1997 and
1996, were $25,209,000, $7,187,000 and $812,000, respectively. Income taxes
payable at December 31, 1998 and 1997 are $2,086,000 and $3,559,000,
respectively.
 
                                       35
<PAGE>   38
 
20.  ASSET DISPOSITIONS
 
     In February and September 1998, the Company received $1,500,000 and
$1,800,000 from the sale of surplus real estate in Massachusetts and Texas,
respectively. The gain on the sales is included in other income on the
accompanying consolidated statement of operations.
 
     In October 1997, the Company sold its New York construction aggregates
operations, including working capital, for $43,186,000, which approximated book
value.
 
     In September 1997, the Company received $3,110,000 from the sale of a
parcel of surplus real estate in Massachusetts. The gain on the sale is included
in other income on the accompanying consolidated statement of operations.
 
     In March 1997, the Company sold its central Illinois ready-mixed and other
concrete operations, including inventories, for proceeds equal to book value of
$10,500,000.
 
     The operations sold in 1997 contributed the following results for the
period through their respective dates of disposition (in thousands):
 
<TABLE>
<CAPTION>
                                                                FOR THE YEARS
                                                                    ENDED
                                                                 DECEMBER 31,
                                                              ------------------
                                                               1997       1996
                                                               ----       ----
<S>                                                           <C>        <C>
Net sales...................................................  $40,326    $69,848
Pre-tax income..............................................  $ 1,011    $ 5,467
</TABLE>
 
21.  ENVIRONMENTAL REGULATION
 
     The Company is subject to extensive, stringent and complex federal, state
and local laws, regulations and ordinances pertaining to the quality and the
protection of the environment and human health and safety, requiring the Company
to devote substantial time and resources in an effort to maintain continued
compliance. Many of the laws and regulations apply to the Company's former
activities, properties and facilities as well as its current operations. There
can be no assurances that judicial or administrative proceedings, seeking
penalties or injunctive relief, will not be brought against the Company for
alleged non-compliance with applicable environmental laws and regulations
relating to matters as to which the Company is currently unaware. For instance,
if releases of hazardous substances are discovered to have occurred at
facilities currently or previously owned or operated by the Company, or at
facilities to which the Company has sent waste materials, the Company may be
subject to liability for the investigation and remediation of such sites. In
addition, changes to such regulations or the enactment of new regulations in the
future could require the Company to undertake capital improvement projects or to
cease or curtail certain operations or could otherwise substantially increase
the capital, operating and other costs associated with compliance. For example,
recent worldwide initiatives for limitations on carbon dioxide emissions could
result in the promulgation of statutes or regulations that would adversely
affect certain aspects of United States manufacturing, including the cement
industry.
 
     The Clean Water Act provides a comprehensive federal regulatory scheme
governing the discharge of pollutants to waters of the United States. This
regulatory scheme requires that permits be secured for discharges of wastewater,
including stormwater runoff associated with industrial activity, to waters of
the United States. The Company has secured or has applied for all required
permits in connection with its wastewater and stormwater discharges.
 
     The Clean Air Act provides for a uniform federal regulatory scheme
governing the control of air pollutant emissions and permit requirements. In
addition, certain states in which the Company operates have enacted laws and
regulations governing the emission of air pollutants and requiring permits for
sources of air pollutants. The Company is required to apply for federal
operating permits for each of its cement manufacturing facilities. All of these
applications have been made. As part of the permitting process, the Company may
be required to install equipment to monitor emissions of air pollutants from its
facilities. In addition, the United States
 
                                       36
<PAGE>   39
 
Environmental Protection Agency ("EPA") is required to develop regulations
directed at reducing emissions of toxic air pollutants from a variety of
industrial sources, including the portland cement manufacturing industry. As
part of this process, the EPA has announced proposed maximum available control
technology ("MACT") standards for cement manufacturing facilities (like Lone
Star's Greencastle and Cape Girardeau plants) that burn hazardous waste fuels
("HWF") and other MACT standards for facilities burning fossil fuels. These MACT
standards are anticipated by the Company to be effective in 1999 and implemented
over a three-year period. The Company currently anticipates that it will be able
to achieve these MACT standards. The EPA has also promulgated under the Clear
Air Act new standards for small particulate matter and ozone emissions, and
related testing will be carried out over the next several years. Depending on
the result of this testing, additional regulatory burdens could be imposed on
the cement industry by states not in compliance with the regulations. The EPA
has promulgated new regulations to reduce nitrogen oxide emissions substantially
over the next eight years. These rules would affect 22 states including three in
which the Company has cement plants: Indiana, Illinois and Missouri. Depending
on state implementation, this emissions reduction could adversely affect the
cement industry in these states.
 
     The Resource Conservation and Recovery Act ("RCRA") establishes a
cradle-to-grave regulatory scheme governing the generation, treatment, storage,
handling, transportation and disposal of solid wastes. Solid wastes which are
classified as hazardous wastes pursuant to RCRA, as well as facilities that
treat, store or dispose of such hazardous wastes, are subject to stringent
regulatory requirements. Generally, wastes produced by the Company's operations
are not classified as hazardous wastes and are subject to less stringent federal
and state regulatory requirements. Cement kiln dust ("CKD"), a by-product of
cement manufacturing, is currently exempted from regulation as a hazardous waste
pursuant to the Bevill Amendment to RCRA. However, in 1995, the EPA issued a
regulatory determination regarding the need for regulatory controls on the
management, handling and disposal of CKD. Generally, the EPA regulatory
determination provides that the EPA intends to draft and promulgate regulations
imposing controls on the management, handling and disposal of CKD that will be
based largely on selected components of the existing RCRA hazardous waste
regulatory program, tailored to address the specific regulatory concerns posed
by CKD. The EPA regulatory determination further provides that new CKD
regulations will be designed both to be protective of the environment and to
minimize the burden on cement manufacturers. It is not possible to predict at
this time precisely what new regulatory controls on the management, handling and
disposal of CKD or what increased costs (or range of costs) would be incurred by
the Company to comply with these requirements. These regulations will be
promulgated through a rulemaking scheduled to be completed shortly. These rules
will be implemented over a three-year period following promulgation. The types
of controls being considered by the EPA include fugitive dust emission controls,
restrictions for landfills located in sensitive areas, groundwater monitoring,
standards for liners and caps, metals limits and corrective action for currently
active units.
 
     In 1995, the State of Indiana made a determination that the CKD stored at
the Company's Greencastle plant is a Type I waste and requested that the Company
apply for a formal permit for an on-site landfill for the CKD. The Company
understands that similar notices were sent to other cement manufacturers in the
State of Indiana. The Company is protesting this determination through legal
channels and has received a stay to allow it to demonstrate that current
management practices pose no threat to the environment. The Company believes
that the State's determination ultimately will be reversed or the Company will
receive the needed permit or other adequate relief, such as an agreed order
requiring certain additional waste management procedures that are less stringent
than those generally required for Type I wastes. If the Company is not
successful in this regard, however, like other Indiana cement producers, the
Greencastle plant could incur substantially increased operating and capital
costs.
 
     The Cape Girardeau, Missouri and Greencastle, Indiana plants, which are the
Company's two cement manufacturing facilities using HWF as a cost-saving energy
source, are subject to strict federal, state and local requirements governing
hazardous waste treatment, storage and disposal facilities, including those
contained in the federal Boiler and Industrial Furnace Regulations promulgated
under RCRA (the "BIF Rules"). The Company has secured the permit required under
RCRA and the BIF Rules for the Cape Girardeau plant, and the Greencastle plant
also will go through this permitting process and has completed a three-year
recertification of its existing interim status. The Greencastle permit is a
requirement to enable Lone Star to continue the
 
                                       37
<PAGE>   40
 
use of HWF at the plant. The permitting process is lengthy and complex,
involving the submission of extensive technical data, and there can be no
assurances that the plant will be successful in securing its final RCRA permit.
In addition, if received, the permit could contain terms and conditions with
which the Company cannot comply or could require the Company to install and
operate costly control technology equipment. While Lone Star believes that it is
currently in compliance with the extensive and complex technical requirements of
the BIF Rules, there can be no assurances that the Company will be able to
maintain compliance with the BIF Rules or that changes to such rules or their
interpretation by the relevant agencies or courts might not make it more
difficult or cost-prohibitive to continue to burn HWF.
 
     The federal Comprehensive Environmental Response, Compensation and
Liability Act ("CERCLA" or "Superfund"), as well as many comparable state
statutes, creates a joint and several liability scheme for the investigation and
remediation of facilities where releases of hazardous substances are found to
have occurred. Liability may be imposed upon current owners and operators of the
facility, upon owners and operators of the facility at the time of the release
and upon generators and transporters of hazardous substances released at the
facility. While, as noted above, wastes produced by the Company generally are
not classified as hazardous wastes, many of the raw materials, by-products and
wastes currently and previously produced, used or disposed of by the Company or
its predecessors contain chemical elements or components that have been
designated as hazardous substances or which otherwise may cause environmental
contamination. Hazardous substances are or have been used or produced by the
Company in connection with its cement manufacturing operations (e.g. grinding
compounds, refractory bricks), quarrying operations (e.g. blasting materials),
equipment operation and maintenance (e.g. lubricants, solvents, grinding aids,
cleaning aids, used oils), and hazardous waste fuel burning operations. Past
operations of the Company have resulted in releases of hazardous substances at
sites currently or formerly owned by the Company and certain of its subsidiaries
or where waste materials generated by the Company have been disposed. CKD and
other materials were placed in depleted quarries and other locations for many
years. The Company has been named by the EPA as a potentially responsible party
for the investigation and remediation of several Superfund sites, although it
does not currently contemplate that future costs relating to such sites will be
material.
 
     The Company's operations are subject to federal and state laws and
regulations designed to protect worker health and safety. Worker protection at
the Company's cement manufacturing facilities is governed by the federal Mine
Safety and Health Act ("MSHA") and at other Company operations is governed by
the federal Occupational Safety and Health Act ("OSHA").
 
     The December 31, 1998 consolidated balance sheet includes accruals of
$6,300,000 which represent the Company's current estimate of its liability
related to future remediation costs at sites where known environmental
conditions exist. The Company believes these reserves to be adequate for known
environmental matters.
 
22.  LEGAL PROCEEDINGS
 
     From time to time the Company is named as a defendant in lawsuits
asserting, among other things, products liability. The Company maintains such
liability insurance coverage for its operations as it deems reasonable. The
Company does not expect the effect of such matters to have a material effect on
the financial condition of the Company.
 
                                       38
<PAGE>   41
 
23.  QUARTERLY FINANCIAL DATA (UNAUDITED)
 
     Summarized quarterly financial data for 1998 and 1997 is as follows (in
thousands except per share data):
 
<TABLE>
<CAPTION>
                                                                  QUARTER
                                                  ---------------------------------------
1998                                               FIRST     SECOND     THIRD     FOURTH
----                                               -----     ------     -----     ------
<S>                                               <C>       <C>        <C>        <C>
Net sales.......................................  $57,794   $ 97,702   $104,010   $87,559
Gross profit....................................  $13,612   $ 36,459   $ 43,543   $31,321
Net income......................................  $ 7,061   $ 22,412   $ 28,750   $18,059
                                                  -------   --------   --------   -------
Basic earnings per common share.................  $  0.33   $   1.05   $   1.39   $  0.93
                                                  -------   --------   --------   -------
Diluted earnings per common share...............  $  0.26   $   0.81   $   1.08   $  0.73
                                                  -------   --------   --------   -------
</TABLE>
 
<TABLE>
<CAPTION>
                                                                  QUARTER
                                                  ---------------------------------------
1997                                               FIRST     SECOND     THIRD     FOURTH
----                                               -----     ------     -----     ------
<S>                                               <C>       <C>        <C>        <C>
Net sales.......................................  $60,836   $104,618   $111,775   $80,336
Gross profit....................................  $ 8,516   $ 36,241   $ 41,868   $28,468
Net income......................................  $   264   $ 20,181   $ 27,722   $17,246
                                                  -------   --------   --------   -------
Basic earnings per common share.................  $  0.01   $   0.92   $   1.26   $  0.79
                                                  -------   --------   --------   -------
Diluted earnings per common share...............  $  0.01   $   0.76   $   1.02   $  0.63
                                                  -------   --------   --------   -------
</TABLE>
 
---------------
(1) Gross profit is net of depreciation expense relating to cost of sales of
    $21,566,000 and $23,182,000 in the years ended December 31, 1998 and 1997,
    respectively.
 
(2) Earnings per share are computed independently for each of the quarters
    presented. Therefore, the sum of the quarterly earnings per share in 1998
    and 1997 does not equal the total computed for the year.
 
(3) Previously reported earnings per share amounts have been restated to give
    effect to the two-for-one stock split in December 1998 (See Notes 1 and 13).
 
ITEM 9.  CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
         FINANCIAL DISCLOSURE.
 
     Not applicable.
 
                                    PART III
 
     The information required by Part III (Items 10-13) is incorporated herein
by reference to the captions "Election of Directors", "Executive Compensation"
and "Security Ownership of Certain Beneficial Owners and Management" in the
Company's definitive proxy statement which pursuant to Regulation 14A will be
filed not later than 120 days after the end of the year covered by this Report.
Certain information relating to the Company's executive officers is included in
Part I of this Report under the caption "Executive Officers of Registrant".
 
                                       39
<PAGE>   42
 
                                    PART IV
 
ITEM 14.  EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K.
 
     (a) The following documents are filed as a part of this Report:
 
          1.  FINANCIAL STATEMENTS AND SCHEDULE:  See Index to Financial
     Statements and Schedule on page 17 of this Report.
 
          2.  EXHIBITS:
 
<TABLE>
       <C>     <C>  <S>
         3.1   --   Amended and Restated Certificate of Incorporation
                    (incorporated herein by reference to Exhibit 3.1 of the
                    Registrant's Annual Report on Form 10-K for the year ended
                    December 31, 1994).
         3.2   --   Certificate of Amendment of Restated Certificate of
                    Incorporation (incorporated herein by reference to Exhibit
                    3.1 of the Registrant's Quarterly Report on Form 10-Q for
                    the quarter ended June 30, 1995).
         3.3   --   Amended By-Laws (incorporated herein by reference to Exhibit
                    3(ii) of the Registrant's Quarterly Report on Form 10-Q for
                    the quarter ended June 30, 1994).
         4.1   --   Form of Note Purchase Agreement, dated as of March 10, 1997,
                    relating to the Company's $50 million principal amount of
                    7.31% Senior Notes Due 2007 (incorporated herein by
                    reference to Exhibit 4.1 of the Registrant's Annual Report
                    on Form 10-K for the year ended December 31, 1996).
         4.2   --   Credit Agreement by and among the Registrant, NBD Bank, N.A.
                    (as Agent) and the Lenders that are signatories thereto,
                    dated as of June 30, 1997 (incorporated herein by reference
                    to Exhibit 4.4 of the Registrant's Quarterly Report on Form
                    10-Q for the quarter ended June 30, 1997).
         4.3   --   Warrant Agreement, dated April 13, 1994, between Lone Star
                    Industries, Inc. and Chemical Bank, as Warrant Agent
                    (incorporated herein by reference to Exhibit 4B of the
                    Registrant's Quarterly Report on Form 10-Q for the quarter
                    ended June 30, 1994).
         4.4   --   Rights Agreement, dated as of November 10, 1994, between
                    Lone Star Industries, Inc. and Chemical Bank (incorporated
                    herein by reference to the Registrant's Form 8-A, dated
                    November 17, 1994).
         4.5   --   Letter regarding adjustment under Rights Agreement, dated
                    February 2, 1999 (filed herewith).
        10.1   --   Settlement Agreement, dated as of February 4, 1994, between
                    Lone Star Industries, Inc., et al. and the Official
                    Committee of Retired Employees of Lone Star Industries,
                    Inc., et al. (incorporated herein by reference to Exhibit
                    10.23 of the Registrant's Registration Statement on Form
                    S-1, File Number 33-55377).
        10.2   --   Agreement, dated as of March 11, 1994, by and between the
                    Debtors and the Unions (incorporated herein by reference to
                    Exhibit 10.25 of the Registrant's Registration Statement on
                    Form S-1, File Number 33-55377).
        10.3   --   Registration Rights Agreement, dated as of July 18, 1994,
                    among Lone Star Industries, Inc., Metropolitan Life
                    Insurance Company, Metropolitan Insurance and Annuity
                    Company and TCW Special Credits, as Agent and Nominee
                    (incorporated herein by reference to Exhibit 10.22 of the
                    Registrant's Registration Statement on Form S-1, File Number
                    33-55377).
       *10.4   --   Second Amended and Restated Employment Agreement, dated as
                    of May 1, 1998, between David W. Wallace and Lone Star
                    Industries, Inc. (incorporated by reference to Exhibit 10.5
                    of the Registrant's Quarterly Report on Form 10-Q for the
                    quarter ended June 30, 1998).
       *10.5   --   Second amended and Restated Employment Agreement, dated as
                    of May 1, 1998, between William M. Troutman and Lone Star
                    Industries, Inc. (incorporated by reference to Exhibit 10.6
                    of the Registrant's Quarterly Report on Form 10-Q for the
                    quarter ended June 30, 1998).
</TABLE>
 
                                       40
<PAGE>   43
 
<TABLE>
<C>        <C>        <S>
   *10.6      --      Second amended and Restated Agreement, dated May 1, 1998, between William M. Troutman and Lone
                      Star Industries, Inc. (incorporated herein by reference to Exhibit 10.7 of the Registrant's
                      Quarterly Report on Form 10-Q for the quarter ended June 30, 1998).
   *10.8      --      Stock Option Agreement, dated as of June 8, 1994, between William M. Troutman and Lone Star
                      Industries, Inc. (incorporated herein by reference to Exhibit 10E(iii) of the Registrant's
                      Quarterly Report on Form 10-Q for the quarter ended June 30, 1994).
   *10.9      --      Form of Indemnification Agreement entered into between Lone Star Industries, Inc. and
                      directors and an executive officer (incorporated herein by reference to Exhibit 10G of the
                      Registrant's Quarterly Report on Form 10-Q for the quarter ended June 30, 1994).
   *10.10     --      Form of "Change of Control" agreement for certain executive officers of Lone Star Industries,
                      Inc. (incorporated herein by reference to Exhibit 10.10 of the Registrant's Quarterly Report
                      on Form 10-Q for the quarter ended June 30, 1998).
   *10.11     --      Form of stock option agreement for certain executive officers of Lone Star Industries, Inc.
                      (incorporated herein by reference to Exhibit 10J of the Registrant's Quarterly Report on Form
                      10-Q for the quarter ended June 30, 1994).
   *10.12     --      Lone Star Industries, Inc. Management Stock Option Plan (incorporated herein by Reference to
                      Appendix A of the Registrant's Definitive Proxy Statement, dated May 11, 1994).
   *10.13     --      Lone Star Industries, Inc. Directors Stock Option Plan (incorporated herein by Reference to
                      Appendix B of the Registrant's Definitive Proxy Statement, dated May 11, 1994).
   *10.14     --      Lone Star Industries, Inc. Employees Stock Purchase Plan (incorporated herein by Reference to
                      Appendix C of the Registrant's Definitive Proxy Statement, dated May 11, 1994).
   *10.15     --      Lone Star Industries, Inc. 1996 Long Term Incentive Plan (incorporated herein by Reference to
                      Appendix A of the Registrant's Definitive Proxy Statement, dated April 1, 1996).
   *10.16     --      Lone Star Industries, Inc. Supplemental Executive Retirement Plan, effective July 1, 1996
                      (incorporated by reference to Exhibit 10.18 of the Registrant's Annual Report on Form 10-K for
                      the year ended December 31, 1996).
   *10.17     --      Lone Star Industries, Inc. Amended and Restated Executive Incentive Plan (incorporated herein
                      by reference to Exhibit 10.19 of the Registrant's Quarterly Report on Form 10-Q for the
                      quarter ended June 30, 1997).
   *10.18     --      Lone Star Industries, Inc. Voluntary Deferred Compensation Plan for Non-Employee Directors
                      (incorporated herein by reference to Appendix B of the Registrant's Definitive Proxy
                      Statement, dated April 1, 1996).
    21        --      Subsidiaries of the Company (incorporated herein by reference to Exhibit 21 of the
                      Registrant's Annual Report on Form 10-K for the year ended December 31, 1996).
    23        --      Consent of PricewaterhouseCoopers LLP (filed herewith).
    27        --      Financial Data Schedule (filed herewith).
</TABLE>
 
     (b) Reports on Form 8-K.
 
         Form 8-K, November 19, 1998 -- Item 5 -- Other Events.
 
         Form 8-K, December 9, 1998, -- Item 5 -- Other Events.
---------------
* Indicates management contract or compensatory plan or arrangement.
 
                                       41
<PAGE>   44
 
                                   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.
 
                                             LONE STAR INDUSTRIES, INC.
 
                                             By:    /s/ JAMES W. LANGHAM
 
                                               ---------------------------------
                                                       JAMES W. LANGHAM
                                                    Vice President, General
                                                     Counsel and Secretary
 
                                                      Date: March 5, 1999
 
     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 and on the dates indicated.
 
<TABLE>
<CAPTION>
                  SIGNATURE                              TITLE OR CAPACITY                  DATE
                  ---------                              -----------------                  ----
<C>                                            <S>                                      <C>
 
            /s/ DAVID W. WALLACE               Director and Chairman of the Board       March 5, 1999
---------------------------------------------
              DAVID W. WALLACE
 
             /s/ JAMES E. BACON                Director                                 March 5, 1999
---------------------------------------------
               JAMES E. BACON
 
           /s/ THEODORE F. BROPHY              Director                                 March 5, 1999
---------------------------------------------
             THEODORE F. BROPHY
 
            /s/ ARTHUR B. NEWMAN               Director                                 March 5, 1999
---------------------------------------------
              ARTHUR B. NEWMAN
 
                                               Director
---------------------------------------------
              ALLEN E. PUCKETT
 
           /s/ ROBERT G. SCHWARTZ              Director                                 March 5, 1999
---------------------------------------------
             ROBERT G. SCHWARTZ
 
           /s/ WILLIAM M. TROUTMAN             Director, President and Chief            March 5, 1999
---------------------------------------------  Executive Officer
             WILLIAM M. TROUTMAN
 
            /s/ JACK R. WENTWORTH              Director                                 March 5, 1999
---------------------------------------------
              JACK R. WENTWORTH
 
           /s/ WILLIAM E. ROBERTS              Vice President, Chief Financial          March 5, 1999
---------------------------------------------  Officer,
             WILLIAM E. ROBERTS                Controller and Treasurer
</TABLE>
 
                                       42
<PAGE>   45
 
                           LONE STAR INDUSTRIES, INC.
 
                SCHEDULE II -- VALUATION AND QUALIFYING ACCOUNTS
              FOR THE YEARS ENDED DECEMBER 31, 1998, 1997 AND 1996
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                              ADDITIONS
                                            BALANCE    ------------------------
                                              AT       CHARGED TO     CHARGED                     BALANCE AT
                                           BEGINNING   COSTS AND     TO OTHER                       END OF
               DESCRIPTION                 OF PERIOD    EXPENSES    ACCOUNTS(2)   DEDUCTIONS(1)     PERIOD
               -----------                 ---------   ----------   -----------   -------------   ----------
<S>                                        <C>         <C>          <C>           <C>             <C>
FOR THE YEAR ENDED DECEMBER 31, 1998
  Allowance for doubtful accounts
     deducted from notes and accounts
     receivable..........................   $3,838          48             7            358         $3,535
                                            ======       =====         =====          =====         ======
FOR THE YEAR ENDED DECEMBER 31, 1997
  Allowance for doubtful accounts
     deducted from notes and accounts
     receivable..........................   $5,099         124           364          1,749         $3,838
                                            ======       =====         =====          =====         ======
FOR THE YEAR ENDED DECEMBER 31, 1996
  Allowance for doubtful accounts
     deducted from notes and accounts
     receivable..........................   $5,936         270         1,401          2,508         $5,099
                                            ======       =====         =====          =====         ======
</TABLE>
 
------------------------
 
(1) Deductions in the years ended December 31, 1998, 1997 and 1996 primarily
    represent uncollectible accounts charged off. Deductions in the year ended
    December 31, 1997 partly represent the allowance related to the New York
    construction aggregates operations which were sold in 1997.
 
(2) Represents recoveries of accounts previously charged off, and reserves
    related to dispositions.
 
                                       43