SIMPSON MANUFACTURING CO INC /CA/
424B4, 1998-02-25
CUTLERY, HANDTOOLS & GENERAL HARDWARE
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<PAGE>   1
 
PROSPECTUS
   
1,437,500 Shares
    
 
LOGO
 
Common Stock
(without par value)
 
   
All of the 1,437,500 shares of the Common Stock, without par value (the "Common
Stock"), of Simpson Manufacturing Co., Inc., a California corporation (the
"Company"), are hereby offered by Simpson PSB Fund (the "Principal Selling
Shareholder") and Thomas J Fitzmyers (together, the "Selling Shareholders"). See
"Principal and Selling Shareholders." The Company will not receive any of the
proceeds from the sale of Common Stock by the Selling Shareholders. See "Use of
Proceeds."
    
 
   
The Common Stock is traded on the New York Stock Exchange, Inc. (the "NYSE")
under the symbol "SSD." On February 24, 1998, the last reported sale price of
the Common Stock on the NYSE was $38.0625 per share. See "Price Range of Common
Stock."
    
 
SEE "RISK FACTORS" BEGINNING ON PAGE 8 FOR CERTAIN INFORMATION THAT SHOULD BE
CONSIDERED BY PROSPECTIVE INVESTORS.
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
 
   
<TABLE>
<S>                                     <C>                 <C>                 <C>
- ---------------------------------------------------------------------------------------------------
                                                                                PROCEEDS TO
                                        PRICE TO            UNDERWRITING        SELLING
                                        PUBLIC              DISCOUNT(1)         SHAREHOLDERS(2)
- ---------------------------------------------------------------------------------------------------
Per Share                               $38.00              $1.90               $36.10
- ---------------------------------------------------------------------------------------------------
Total(3)                                $54,625,000         $2,731,250          $51,893,750
- ---------------------------------------------------------------------------------------------------
</TABLE>
    
 
(1) The Company and the Selling Shareholders have agreed to indemnify the
Underwriters against certain liabilities, including liabilities under the
Securities Act of 1933, as amended. See "Underwriting."
   
(2) Before deducting expenses of the offering payable by the Principal Selling
Shareholder, estimated at $330,000. The Company intends to make a charitable
donation to the Principal Selling Shareholder in an amount equal to one-half of
such expenses that the Principal Selling Shareholder pays.
    
   
(3) The Principal Selling Shareholder granted the Underwriters an option, which
the Underwriters exercised, to purchase up to an additional 187,500 shares of
Common Stock, on the same terms as set forth above, solely to cover
overallotments, if any. See "Underwriting."
    
 
   
The shares of Common Stock offered by this Prospectus are being offered by the
Underwriters, subject to prior sale, when, as and if delivered to and accepted
by the Underwriters, and subject to approval of certain legal matters by Cahill
Gordon & Reindel, counsel for the Underwriters. It is expected that delivery of
the shares of Common Stock will be made against payment therefor on or about
March 2, 1998, at the offices of J.P. Morgan Securities Inc., 60 Wall Street,
New York, New York.
    
 
J.P. MORGAN & CO.
                 MERRILL LYNCH & CO.
 
                                  BANCAMERICA ROBERTSON STEPHENS
 
   
February 25, 1998
    
<PAGE>   2
 
                                            [PHOTOGRAPH]
 
                                            SIMPSON STRONG-TIE connectors have
                                            been designed for fast, easy
                                            installation that enhances the
                                            strength, durability and safety of
                                            modern wood-to-wood,
                                            wood-to-concrete and wood-to-masonry
                                            construction.
 
[PHOTOGRAPH]
 
SIMPSON DURA-VENT venting systems are
engineered to achieve a high level of
performance with gas and wood-burning
appliances, including gas furnaces and water
heaters, gas fireplaces and stoves, wood
stoves and pellet stoves.
 
                                            [PHOTOGRAPH]
 
                                            SIMPSON STRONG-TIE anchoring systems
                                            include epoxy adhesives and
                                            mechanical anchors for a variety of
                                            structural connections into a number
                                            of different materials.
 
CERTAIN PERSONS PARTICIPATING IN THIS OFFERING MAY ENGAGE IN TRANSACTIONS THAT
STABILIZE, MAINTAIN OR OTHERWISE AFFECT THE PRICE OF THE COMMON STOCK.
SPECIFICALLY, THE UNDERWRITERS MAY OVERALLOT IN CONNECTION WITH THE OFFERING,
AND MAY BID FOR, AND PURCHASE, SHARES OF THE COMMON STOCK IN THE OPEN MARKET.
FOR A DESCRIPTION OF THESE ACTIVITIES, SEE "UNDERWRITING."
 
                                        2
<PAGE>   3
 
No person has been authorized to give any information or make any
representations in connection with this offering other than those contained or
incorporated by reference in this Prospectus, and, if given or made, such
information or representations must not be relied on as having been authorized
by the Company, the Selling Shareholders or any of the Underwriters. This
Prospectus does not constitute an offer to sell, or a solicitation of an offer
to buy, any securities in any jurisdiction to any person to whom it is unlawful
to make such offer or solicitation. Neither the delivery of this Prospectus nor
any sale made hereunder shall, under any circumstances, create any implication
that there has been no change in the affairs of the Company or that the
information contained herein is correct as of any date subsequent to the date
hereof.
 
                               TABLE OF CONTENTS
<TABLE>
<CAPTION>
                                        PAGE
<S>                                     <C>
Incorporation of Certain Documents by
  Reference...........................      4
Additional Information................      4
Prospectus Summary....................      5
Risk Factors..........................      8
Use of Proceeds.......................     13
Dividend Policy.......................     13
Price Range of Common Stock...........     13
Capitalization........................     14
Selected Consolidated Financial
  Information.........................     15
 
<CAPTION>
                                        PAGE
<S>                                     <C>
Management's Discussion and Analysis
  of Financial Condition and Results
  of Operations.......................     17
Business..............................     22
Management............................     33
Principal and Selling Shareholders....     35
Description of Capital Stock..........     37
Underwriting..........................     38
Legal Matters.........................     39
Experts...............................     39
Index to Consolidated Financial
  Statements..........................    F-1
</TABLE>
 
Strong-Tie(R), Dura-Vent(R), Dura/Connect(R), Dura-Plus(R), Dura/Liner(R),
Direct Vent G.S.(R) and There Is No Equal(R) (when used with the registered
design) are registered trademarks of the Company's subsidiaries.
 
                                        3
<PAGE>   4
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
The following documents filed or to be filed with the Securities and Exchange
Commission (the "Commission") under the Securities Exchange Act of 1934, as
amended (the "Exchange Act"), are hereby incorporated by reference into this
Prospectus:
 
1. The Company's Annual Report on Form 10-K for the fiscal year ended December
31, 1996;
 
2. The Company's Proxy Statement dated April 14, 1997;
 
3. The Company's Quarterly Reports on Form 10-Q dated May 14, August 13 and
November 10, 1997; and
 
4. The Company's Current Reports on Form 8-K dated January 7, March 21 and
September 25, 1997.
 
All documents filed by the Company pursuant to Sections 13(a), 13(c), 14 or
15(d) of the Exchange Act after the date of this Prospectus and prior to the
termination of the offering shall be deemed to be incorporated by reference
herein and to be a part hereof from the date of filing of such documents. Any
statement contained in this Prospectus or in a document incorporated or deemed
to be incorporated by reference herein shall be deemed to be modified or
superseded for purposes of this Prospectus to the extent that a statement
contained herein or in any subsequently-filed document which also is or is
deemed to be incorporated by reference herein modifies or supersedes such
statement. Any such statement so modified or superseded shall not be deemed,
except as so modified or superseded, to constitute a part of this Prospectus.
 
The Company will provide without charge to each person, including any beneficial
owner, to whom this Prospectus is delivered, on written or oral request of such
person, a copy of any and all of the documents that have been incorporated by
reference herein (not including exhibits to such documents unless such exhibits
are specifically incorporated by reference herein or into such documents). Such
request may be directed to Simpson Manufacturing Co., Inc., 4637 Chabot Drive,
Suite 200, P.O. Box 10789, Pleasanton, California 94588-0789, telephone (510)
460-9912, Attn: Chief Financial Officer.
 
                             ADDITIONAL INFORMATION
 
The Company is subject to the reporting requirements of the Exchange Act and, in
accordance therewith, files annual and quarterly reports, proxy statements and
other information with the Commission. Such reports, proxy statements and other
information may be inspected and copied at the Commission's Regional Offices at
7 World Trade Center, 13th Floor, New York, New York 10048, and 500 West Madison
Street, Suite 1400, Chicago, Illinois 60661-2511. Copies of such material can be
obtained at prescribed rates from the Public Reference Section of the Commission
at 450 Fifth Street, N.W., Washington, D.C. 20549. The Common Stock of the
Company is listed on the NYSE. Reports and other information concerning the
Company may be inspected at the offices of the NYSE at 20 Broad Street, New
York, New York 10005. The Commission also maintains a World Wide Web site
(http://www.sec.gov) that contains reports, proxy and information statements and
other information regarding registrants, including the Company, that file
electronically with the Commission.
 
A registration statement on Form S-3 with respect to the Common Stock offered
hereby (the "Registration Statement") has been filed with the Commission under
the Securities Act of 1933, as amended (the "Securities Act"). This Prospectus
does not contain all of the information contained in the Registration Statement
and the exhibits and schedules thereto, certain portions of which have been
omitted pursuant to the rules and regulations of the Commission. For further
information with respect to the Company and the Common Stock offered hereby,
reference is made to the Registration Statement and the exhibits and schedules
thereto. Statements contained in this Prospectus regarding the contents of any
contract or any other document are not necessarily complete and, in each
instance, reference is hereby made to the copy of such contract or document
filed as an exhibit to the Registration Statement. The Registration Statement,
including exhibits thereto, may be inspected without charge at the Commission's
principal office in Washington, D.C., and copies of all or any part thereof may
be obtained from the Public Reference Section, Securities and Exchange
Commission, Washington, D.C. 20549, on payment of the prescribed fees.
 
                                        4
<PAGE>   5
 
                               PROSPECTUS SUMMARY
 
The following summary is qualified in its entirety by and should be read in
conjunction with the more detailed information, including "Risk Factors" and the
Consolidated Financial Statements and Notes thereto, appearing elsewhere or
incorporated by reference in this Prospectus. All references to the Company
refer to Simpson Manufacturing Co., Inc. and its predecessors unless indicated
otherwise.
 
                                  THE COMPANY
 
Simpson Manufacturing Co., Inc. (the "Company"), through its subsidiary, Simpson
Strong-Tie Company Inc. ("Simpson Strong-Tie" or "SST"), designs, engineers and
is a leading manufacturer of wood-to-wood, wood-to-concrete and wood-to-masonry
connectors, and through its subsidiary, Simpson Dura-Vent Company, Inc.
("Simpson Dura-Vent" or "SDV"), designs, engineers and manufactures venting
systems for gas and wood burning appliances. The Company markets its products to
the residential construction, light industrial and commercial construction,
remodeling and do-it-yourself ("DIY") markets. The Company believes that Simpson
Strong-Tie benefits from strong brand name recognition among architects and
engineers who frequently specify in building plans the use of SST products, and
that Simpson Dura-Vent benefits from strong brand name recognition among
contractors, dealers, distributors and original equipment manufacturers ("OEMs")
to which SDV markets its products. The Company has continuously manufactured
structural connectors since 1956.
 
From 1993 through 1997, the Company's annual net sales grew from $113.9 million
to $246.1 million, a compound annual growth rate of 21.2%. In the same period,
the Company's annual net income grew from $8.0 million to $26.0 million, a
compound annual growth rate of 34.4%. Growth has been derived primarily from
frequent new product introductions, expansion into new geographic markets and
growth of distribution channels.
 
Connectors produced by Simpson Strong-Tie typically are steel devices that are
used to strengthen, support and connect joints in residential and commercial
construction and DIY projects. These products enhance the safety and durability
of the structures in which they are installed and can save time and labor costs
for the contractor. SST's connector products increase structural integrity and
improve structural resistance to seismic, wind and other forces. Applications
range from building framing to deck construction to DIY projects. SST produces
and markets more than 1,300 standard connector products in addition to products
that it manufactures to custom specifications requested by architects and
engineers.
 
Simpson Dura-Vent's venting systems are used to vent gas furnaces and water
heaters, gas fireplaces and stoves, wood burning stoves and pellet stoves. SDV's
metal vents, chimneys and chimney liner systems exhaust the products of
combustion to the exterior of the building, and some products introduce outside
air into the appliance. SDV designs its products for ease of assembly and safe
operation and to achieve a high level of performance. SDV produces and markets
several hundred different venting products and systems.
 
The Company emphasizes continuous new product development and often obtains
patent protection for its new products. The Company's products are marketed in
all 50 states of the United States and in England, France, Germany, Canada,
Mexico, Japan and Australia. Both Simpson Strong-Tie and Simpson Dura-Vent
products are distributed through a contractor and dealer distributor network,
home centers and OEMs.
 
The Company has developed and uses automated manufacturing processes. Its
innovative manufacturing systems and techniques have allowed it to control
manufacturing costs, even while developing both new products and products that
meet customized requirements and specifications. The Company's development of
specialized manufacturing processes has also permitted increased operating
flexibility and enhanced product design innovation. The Company has developed a
quality management system that employs numerous quality-control procedures.
Since 1996, SST's quality management system has been registered under ISO 9001.
The Company has 11 manufacturing locations in the United States, Canada, France
and the United Kingdom.
 
The Company is a California corporation and was reorganized in 1994 as a holding
company for Simpson Strong-Tie and Simpson Dura-Vent. The Company's principal
business offices are located at 4637 Chabot Drive, Suite 200, P.O. Box 10789,
Pleasanton, California 94588-0789, telephone (510) 460-9912.
 
                                        5
<PAGE>   6
 
                                  THE OFFERING
 
   
<TABLE>
<S>                                            <C>
COMMON STOCK OFFERED BY THE SELLING
  SHAREHOLDERS                                 1,437,500 shares(1)
COMMON STOCK OUTSTANDING BEFORE AND AFTER
  THIS OFFERING                                11,517,113 shares(2)
USE OF PROCEEDS                                The net proceeds to Simpson PSB Fund, a
                                               California nonprofit public benefit
                                               corporation (the "Principal Selling
                                               Shareholder"), will be used principally for
                                               charitable purposes. See "Use of Proceeds."
RISK FACTORS                                   For a discussion of certain considerations
                                               relevant to an investment in the Common
                                               Stock, see "Risk Factors."
NYSE SYMBOL                                    "SSD"
</TABLE>
    
 
- ---------------
 
   
(1) Includes 187,500 shares of Common Stock that will be sold pursuant to the
Underwriters' exercise of an overallotment option granted by the Principal
Selling Shareholder. See "Underwriting."
    
 
(2) Excludes an aggregate of 978,417 shares of Common Stock issuable on exercise
of stock options that were outstanding as of December 31, 1997. See
"Business -- Employees and Labor Relations" and "Principal and Selling
Shareholders."
 
                                        6
<PAGE>   7
 
                   SUMMARY CONSOLIDATED FINANCIAL INFORMATION
 
The following table sets forth summary consolidated financial information with
respect to the Company for each of the five years ended December 31, 1993, 1994,
1995, 1996 and 1997, derived from the audited Consolidated Financial Statements
of the Company, the most recent three years of which appear elsewhere herein.
The data presented below should be read in conjunction with the Consolidated
Financial Statements and related Notes thereto and "Management's Discussion and
Analysis of Financial Condition and Results of Operations" included elsewhere
herein.
 
<TABLE>
<CAPTION>
                           --------------------------------------------------------------------------
  Dollars in thousands,                             YEARS ENDED DECEMBER 31,
  except per share data       1993           1994            1995            1996            1997
                           ----------     -----------     -----------     -----------     -----------
<S>                        <C>            <C>             <C>             <C>             <C>
STATEMENT OF OPERATIONS DATA
Net sales                  $  113,923     $   151,290     $   167,958     $   202,409     $   246,074
Gross profit                   41,536          54,306          58,590          78,015          96,795
Compensation related to
  stock plans(1)(2)               693           6,909              61             180             305
Income from operations         14,550          14,075          22,907          32,695          43,324
Net income                      7,970           5,451          14,122          19,721          25,986
Net income per share
  Basic                    $     1.07     $       .56     $      1.25     $      1.73     $      2.26
  Diluted(3)               $      .89     $       .51     $      1.23     $      1.68     $      2.17
Weighted average shares
  outstanding
  Basic                     7,495,894       9,717,004      11,316,673      11,424,945      11,474,592
  Diluted(3)                9,051,425      10,561,641      11,460,567      11,755,184      11,965,950
</TABLE>
 
<TABLE>
<CAPTION>
                                                                    ---------------------------
                                                                        AS OF DECEMBER 31,
                                                                       1996            1997
                                                                    -----------     -----------
<S>                                                                 <C>             <C>
BALANCE SHEET DATA
Working capital                                                     $    70,676     $    83,297
Property, plant and equipment, net                                       28,688          42,925
Total assets                                                            122,521         150,765
Total debt                                                                   --              30
Total liabilities                                                        20,224          21,814
Total shareholders' equity                                              102,297         128,951
</TABLE>
 
- ---------------
 
(1) In 1994, a reorganization was effected to consolidate shareholdings in
Simpson Strong-Tie and Simpson Dura-Vent (the "1994 Reorganization"). As part of
the 1994 Reorganization, the Company recorded a one-time, non-cash,
non-deductible compensation charge of approximately $6.4 million in the first
quarter of 1994, resulting from an exchange of Company shares for outstanding
SST and SDV shares held by employees. After giving effect to all components of
the 1994 Reorganization, including this non-cash compensation charge,
shareholders' equity increased by $1.1 million. The Company also recorded in the
first quarter of 1994 other non-cash compensation charges aggregating
approximately $400,000 and a cash compensation charge of approximately $100,000.
(2) The year ended December 31, 1993, includes $470,000 in one-time, non-cash
expense for options earned by employees pursuant to compensation arrangements
with exercise prices less than fair value. The balance for the year 1993
includes dividends paid to and repurchases of shares of common stock from
employees, which shares are deemed to be stock options (deemed options) for
financial reporting purposes.
(3) For purposes of calculating net income per share, common and common
equivalent shares issued during the 12-month period prior to the Company's
initial public offering in 1994 have been included as if they were outstanding
for all periods presented using the treasury stock method.
 
                                        7
<PAGE>   8
 
                                  RISK FACTORS
 
This Prospectus contains forward-looking statements that involve risks and
uncertainties, certain of which are discussed below and in reports filed by the
Company with the Securities and Exchange Commission. See "Incorporation of
Certain Documents by Reference" and "Additional Information." Actual results
might differ materially from results suggested by any forward-looking statements
in this Prospectus.
 
In addition to the other information included or incorporated by reference in
this Prospectus, the following risk factors should be considered carefully by
prospective investors in evaluating the Company and its business before
purchasing shares of Common Stock offered hereby.
 
EFFECT OF INCREASED RAW MATERIAL COSTS
 
Steel and other metals are the Company's principal raw materials. The Company
purchases steel and other raw materials from various suppliers. The steel
industry is highly cyclical and prices for the Company's raw materials are
influenced by numerous factors beyond the Company's control, including general
economic conditions, competition, labor costs, import duties and other trade
restrictions. The Company historically has not attempted to hedge against
changes in prices of steel or other raw materials. The Company might not be able
to increase its product prices in amounts that correspond to increases in raw
materials prices without materially and adversely affecting its sales and
profits. See "Management's Discussion and Analysis of Financial Condition and
Results of Operations" and "Business -- Raw Materials."
 
SEASONALITY AND FLUCTUATIONS IN QUARTERLY RESULTS
 
The Company's sales are seasonal, with operating results varying from quarter to
quarter. The Company's sales and income have historically been lower in the
first and fourth quarters and higher in the second and third quarters of the
year as retailers and contractors purchase construction materials in the late
spring and summer months for the construction season. In addition, demand for
the Company's products and the Company's results of operations are significantly
affected by weather conditions, such as unseasonably warm, cold or wet weather,
which affect, and sometimes delay or accelerate, installation of certain of the
Company's products. Political and economic events can also affect the Company's
revenues. The Company has little control over the timing of customer purchases,
and sales anticipated in one quarter may occur in another quarter, thereby
affecting both quarters' results. In addition, the Company incurs significant
expenses as it develops, produces and markets its products in anticipation of
future orders. Products typically are shipped as orders are received, and
accordingly the Company operates with little backlog. As a result, net sales in
any quarter generally depend on orders booked and shipped in that quarter. A
significant portion of the Company's operating expenses are fixed, and planned
expenditures are based primarily on sales forecasts. If sales fall below the
Company's expectations, operating results would be adversely affected for the
relevant quarters, as expenses based on those expectations will already have
been incurred. See "Management's Discussion and Analysis of Financial Condition
and Results of Operations."
 
CONSTRUCTION INDUSTRY CYCLES
 
The Company's principal markets are in the building construction industry. That
industry is subject to significant volatility as a result of fluctuations in
interest rates, the availability of credit to builders and developers, inflation
rates and other economic factors and trends, none of which is within the
Company's control. Declines in commercial and residential construction may be
expected to reduce the demand for the Company's products. The Company cannot
provide any assurance that its business will not be adversely affected by future
negative economic or construction industry performance or that future declines
in construction activity or the demand for the Company's products will not have
material adverse effects on the Company and its business and financial
condition. See "Management's Discussion and Analysis of Financial Condition and
Results of Operations."
 
DEPENDENCE ON INTELLECTUAL PROPERTY PROTECTION
 
The Company's ability to compete effectively with other companies depends in
part on its ability to maintain the proprietary nature of its technology. The
Company owns more than 80 patents in the United States and other
 
                                        8
<PAGE>   9
 
countries and has applied for an additional 39 patents, but there can be no
assurance as to the degree of protection afforded by these patents or the
likelihood that patents will issue pursuant to pending patent applications.
Furthermore, there can be no assurance that others will not independently
develop the same or similar technology, develop around the patented aspects of
any of the Company's products or proposed products, or otherwise obtain access
to the Company's proprietary technology.
 
In addition to seeking patent protection, the Company also relies on unpatented
proprietary technology to maintain its competitive position. Nevertheless, there
can be no assurance that the Company will be able to protect its know-how or
other proprietary information.
 
In attempting to protect its proprietary information, the Company expects that
it may sometimes be necessary to prosecute lawsuits against competitors and
others that the Company believes have infringed or are infringing the Company's
rights. In such an event, the defendant may assert counterclaims to complicate
or delay the litigation or for other reasons. If the Company were to be unable
to maintain the proprietary nature of its significant products, the Company's
business and financial condition could be materially and adversely affected. See
"Business -- Patents and Proprietary Rights."
 
PRODUCT LIABILITY
 
The Company designs and manufactures most of its standard products and expects
that it will continue to do so. The Company employs engineers and designers to
design and test its products under development. In addition, the Company
maintains a quality control system. The Company has on occasion found
manufacturing flaws in its products. In addition, the Company purchases from
third party suppliers raw materials, principally steel, and finished goods that
are produced and processed by other manufacturers. The Company also has on
occasion found flaws in raw materials and finished goods produced by others,
some of which flaws have not been apparent until after the products were
installed by customers. Many of the Company's products are integral to the
structural soundness or fire safety of the buildings in which they are used. As
a result, if any flaws exist in the Company's products (as a result of design,
raw material or manufacturing flaws) and such flaws are not discovered and
corrected before the Company's products are incorporated into structures, the
structures could suffer severe damage (such as collapse or fire) and personal
injury could result. To the extent that such damage or injury is not covered by
the Company's product liability insurance, and if the Company were to be found
to have been negligent or otherwise culpable, the Company and its business and
financial condition could be materially and adversely affected by the necessity
to correct such damage and to compensate persons who might have suffered injury.
 
Furthermore, in the event that a flaw is discovered after installation but
before any damage or injury occurs, it may be necessary for the Company to
recall products, and the Company may be liable for any costs necessary to
retrofit the affected structures. Any such recall or retrofit could entail
substantial costs and adversely affect the Company's reputation, sales and
financial condition. The Company does not carry insurance against recall costs,
and its product liability insurance may not cover retrofit costs.
 
The severe earthquake in Northridge, California, in January 1994, damaged or
destroyed numerous structures, and Company products were installed in some of
those structures. No assurance can be given that claims will not be made against
the Company with regard to damage or destruction of structures incorporating
Company products resulting from a natural disaster. Any such claims, if
asserted, could materially and adversely affect the Company.
 
REGULATORY MATTERS
 
The design, capacity and quality of most of the Company's products and
manufacturing processes are subject to numerous and extensive regulations and
standards promulgated by governmental, quasi-governmental and industry
organizations. Such regulations and standards are highly technical and complex
and are subject to frequent revision. The failure of the Company's products or
manufacturing processes to comply with any of such regulations and standards
could impair the Company's ability to manufacture and market its products
profitably and materially and adversely affect the Company's business and
financial condition. In addition, under the National Appliance Energy
Conservation Act, the Department of Energy periodically reviews the necessity
for increased efficiency standards with respect to gas furnaces. A substantial
percentage of Simpson Dura-Vent's Type B Gas Vent sales are
 
                                        9
<PAGE>   10
 
for gas furnace applications. Minimum appliance efficiency standards might be
adopted that could negatively affect sales of Type B Gas Vents, which could
materially and adversely affect the Company's operating results and financial
condition. See "Business -- Regulation."
 
ENVIRONMENTAL, HEALTH AND SAFETY MATTERS
 
The Company is subject to environmental laws and regulations governing emissions
into the air, discharges into water, and generation, handling, storage,
transportation, treatment and disposal of waste materials. The Company is also
subject to other Federal and state laws and regulations regarding health and
safety matters. The Company's manufacturing operations involve the use of
solvents, chemicals, oils and other materials that are regarded as hazardous or
toxic and the use of complex and heavy machinery and equipment that can pose
severe safety hazards (especially if not properly and carefully used). Some of
the Company's products also incorporate materials that are hazardous or toxic in
some forms (such as zinc and lead, which are used in some steel galvanizing
processes). The Company believes that it has obtained all material licenses and
permits required by environmental, health and safety laws and regulations in
connection with the Company's operations and that its policies and procedures
comply in all material respects with existing environmental, health and safety
laws and regulations. It is possible that additional licenses or permits may be
required, that the Company's policies and procedures might not comply in all
respects with all such laws and regulations or, even if they do, that employees
might fail or neglect to follow them in all respects, and that the Company's
generation, handling, use, storage, transportation, treatment or disposal of
hazardous or toxic materials, machinery and equipment might cause injury to
persons or to the environment. In addition, properties occupied by the Company
may be contaminated by hazardous or toxic substances and remedial action may be
required at some time in the future. It is also possible that materials in
certain of the Company's products could cause injury or sickness. Relevant laws
and regulations could also be changed or new ones could be adopted that require
the Company to obtain additional licenses and permits and cause the Company to
incur substantial expense. Any such event or contamination could have a material
adverse effect on the Company and its liquidity, results of operations and
financial condition. See "Business -- Regulation."
 
DEPENDENCE ON NEW MARKETS; EXPANSION OUTSIDE THE UNITED STATES
 
The Company's future growth, if any, will depend to some extent on its ability
to penetrate new markets, both domestically and internationally. In addition,
construction customs, standards, techniques and methods in international markets
differ from those in the United States. Laws and regulations applicable in new
markets for the Company are likely to be unfamiliar to the Company and
compliance may be substantially more costly than the Company anticipates. As a
result, it may become necessary for the Company to redesign products or to
invent or design new products in order to compete effectively and profitably
outside the United States or in markets that are new to the Company in the
United States. The Company expects that significant time will be required for it
to generate substantial sales or profits in new markets. Other significant
challenges to conducting business in foreign countries include, among other
factors, local acceptance of the Company's products, political instability,
currency controls, changes in import and export regulations, changes in tariff
and freight rates, and fluctuations in foreign exchange rates. There can be no
assurance that the Company will be able to penetrate these markets or that any
such market penetration can be achieved on a timely basis or profitably. If the
Company is not successful in penetrating these markets within a reasonable time,
it will be unable to recoup part or all of the significant investments it will
have made in attempting to do so. See "Business -- Business Strategy" and
"Business -- Industry and Market Trends."
 
ABILITY TO ASSIMILATE ACQUISITIONS
 
The Company has recently made several small acquisitions and may in the future
pursue additional acquisitions of product lines or businesses. Acquisitions
involve numerous risks, including difficulties in the assimilation of the
operations and products of the acquired companies, the diversion of management's
attention from other business concerns, risks of entering markets in which the
Company has little or no direct prior experience, and the potential loss of key
employees of the acquired company. In addition, future acquisitions by the
Company may result in potentially dilutive issuances of equity securities, the
incurring of additional debt, and amortization expenses related to goodwill and
intangible assets, which could adversely affect the Company's profitability. If
an
 
                                       10
<PAGE>   11
 
acquisition occurs, no assurance can be given as to its effect on the Company's
business or operating results. See "Management's Discussion and Analysis of
Financial Condition and Results of Operations" and "Business -- Acquisitions and
Strategic Investments."
 
LOSS OF MANUFACTURING CAPACITY
 
Each of the Company's current and planned manufacturing facilities is located in
a geographic region that has experienced major natural disasters, such as
earthquakes, floods and hurricanes. For example, the 1989 Loma Prieta earthquake
in Northern California destroyed a freeway and caused other major damage within
a few miles of the Company's facilities in San Leandro, California, and the
earthquakes in Northridge, California, in January 1994, destroyed several
freeways and numerous buildings in the region in which the Company's facilities
in Brea are located. The Company does not carry earthquake insurance. Other
insurance that it carries is limited and not likely to be adequate to cover all
of the Company's resulting costs, business interruption and lost profits in the
event of a major natural disaster in the future. If a natural disaster were to
render one or more of the Company's manufacturing facilities totally or
partially unusable, whether or not covered by insurance, the Company's business
and financial condition could be materially and adversely affected.
 
COMPETITION
 
The markets for the Company's products are highly competitive. The Company has
different competitors in various markets that it serves. Some of the Company's
competitors have significantly greater financial and marketing resources than
the Company. In addition, other technologies may be the bases for competitive
products that could render the Company's products obsolete or uncompetitive, and
other companies may find the Company's markets attractive and enter those
markets. Competitive pricing, including price competition or the introduction of
new products, could have material adverse effects on the Company's revenues and
profit margins. See "Business -- Competition."
 
CONTROL BY PRINCIPAL SHAREHOLDERS
 
Barclay Simpson, the Chairman of the Board of the Company, and his seven adult
children collectively own or control approximately 43.3% of the outstanding
shares of Common Stock, and Thomas J Fitzmyers, the President and Chief
Executive Officer of the Company, owns approximately 3.7% of the outstanding
shares of Common Stock. In addition, the Company's profit sharing trusts, of
which Messrs. Simpson and Fitzmyers are trustees, own an aggregate of
approximately 1.3% of the outstanding shares of Common Stock. Mr. Fitzmyers will
sell 50,000 of his shares (approximately 0.4% of the outstanding shares of
Common Stock) in this offering. As a result of such share ownership, under
California law, which provides for cumulative voting for directors, Mr. Simpson,
his children and Mr. Fitzmyers together will continue to have the right to elect
at least three of the seven directors; Messrs. Simpson and Fitzmyers will also
have substantial influence with respect to the election of the other directors.
Messrs. Simpson and Fitzmyers are also expected to continue to exercise
substantial control over fundamental changes affecting the Company, such as a
merger or sale of assets or amendment of the Company's Articles of Incorporation
or Bylaws. Notwithstanding that investors in this offering will have the right
to vote their shares of Common Stock, the Company and its management will
continue to be controlled by Messrs. Simpson and Fitzmyers. See "Management,"
"Principal and Selling Shareholders" and "Description of Capital Stock."
 
CONFLICTS OF INTEREST
 
Barclay Simpson, Thomas J Fitzmyers and Stephen B. Lamson, the Company's
principal executive officers (see "Management"), have and will continue to have
significant conflicts of interest regarding certain properties that the Company
leases from partnerships in which those officers participate. Those partnerships
were organized principally to purchase, own and lease to the Company
manufacturing and warehouse facilities that the Company currently uses. Based on
formal and informal third-party appraisals, the Company believes that some of
the rent and other terms under these leases are less favorable to the Company
than terms that could be obtained from unrelated persons in the current real
estate markets. The Company intends to continue to lease and occupy most of
these facilities for the foreseeable future, and, subject to the approval of the
Company's independent directors, the
 
                                       11
<PAGE>   12
 
leases may be amended, renewed or replaced at any time or from time to time. In
such event, Messrs. Simpson, Fitzmyers and Lamson would be subject to
conflicting interests in their capacities as partners in the partnerships and as
officers, directors and controlling shareholders of the Company. See
"Description of Capital Stock" and Note 9 to the Consolidated Financial
Statements.
 
COLLECTIVE BARGAINING AGREEMENTS
 
A significant number of the Company's employees at two of the Company's major
manufacturing facilities are represented by labor unions and are covered by
collective bargaining agreements, one of which (covering approximately 125
employees) will expire in July 1998. A work stoppage or interruption by a
significant number of the Company's employees could have a material and adverse
effect on the Company and its business and financial condition. See
"Business -- Employees and Labor Relations."
 
DEPENDENCE ON KEY PERSONNEL
 
The Company is dependent on certain key management and technical personnel,
including Barclay Simpson, Thomas J Fitzmyers, Stephen B. Lamson and Donald M.
Townsend. The loss of one or more key employees could have a material adverse
effect on the Company. The Company's success will also depend on its ability to
attract and retain additional highly qualified technical, marketing and
management personnel necessary for the maintenance and expansion of the
Company's activities. The Company faces strong competition for such personnel
and there can be no assurance that the Company will be able to attract or retain
such personnel. See "Management."
 
ISSUANCE OF PREFERRED STOCK
 
The Board of Directors of the Company is authorized by the Company's Articles of
Incorporation to determine the terms of one or more series of preferred stock
and to authorize the issuance of shares of any such series on such terms as the
Board of Directors may approve. See "Description of Capital Stock." No plans or
proposals currently are pending to issue any preferred stock, but any such
issuance in the future could be used to impede an acquisition of the Company
that the Board of Directors does not approve, could further dilute the equity
investments of purchasers of Common Stock in this offering and could reduce the
Company's funds potentially available for the payment of dividends to holders of
Common Stock. See "Risk Factors -- Control by Principal Shareholders" and
"Dividend Policy."
 
SHARE PRICE VOLATILITY
 
The trading price of the Common Stock could be subject to wide fluctuations in
response to quarter to quarter variations in operating results, changes in
earnings estimates by analysts, announcements of technological innovations or
new products by the Company or its competitors, general conditions in the
construction and construction materials industries, relatively low trading
volume in the Common Stock and other events or factors. In addition, in recent
years the stock market has experienced extreme price fluctuations. This
volatility has had a substantial effect on the market prices of securities
issued by many companies for reasons unrelated to the operating performance of
those companies. These broad market fluctuations may adversely affect the market
price of the Common Stock.
 
SHARES ELIGIBLE FOR FUTURE SALE
 
   
Sales of substantial amounts of Common Stock in the public market after this
offering could adversely affect the prevailing market price for the Common
Stock. On completion of this offering, all of the outstanding shares of Common
Stock will be freely tradeable without restriction under the Securities Act,
other than the 4,188,234 outstanding shares that will be held by persons who are
"affiliates" of the Company as that term is defined in Rule 144 under the
Securities Act. Options to purchase 978,417 shares of Common Stock were
outstanding as of December 31, 1997, including options to purchase 700,497
shares that were exercisable. If a substantial number of shares were sold in the
public market pursuant to Rule 144 or on exercise of options, the trading price
of the Common Stock in the public market could be adversely affected.
    
 
                                       12
<PAGE>   13
 
                                USE OF PROCEEDS
 
   
The Company will not receive any proceeds from this offering. The net proceeds
to the Selling Shareholders (after deducting underwriting discounts and
estimated offering expenses) from the sale of 1,437,500 shares of Common Stock
offered hereby by the Selling Shareholders are estimated to be $51,563,750. Of
that total, the Principal Selling Shareholder will receive approximately
$49,758,750, which it will apply principally to its charitable purposes and to
its administrative and operating expenses.
    
 
                                DIVIDEND POLICY
 
The Company has not paid any dividends since 1993 and currently intends to
retain its future earnings, if any, to finance operations and fund its growth.
The Company does not anticipate paying cash dividends on the Common Stock for
the foreseeable future. Future dividends, if any, will be determined by the
Company's Board of Directors, based on the Company's earnings, financial
condition and other factors deemed relevant by the Board of Directors.
 
                          PRICE RANGE OF COMMON STOCK
 
The Company's Common Stock has been listed on the NYSE under the symbol "SSD"
since October 13, 1997. Prior to that time, the Common Stock was traded on the
Nasdaq National Market tier of The Nasdaq Stock Market under the trading symbol
"SMCO." The following table shows the range of high and low closing sale prices
per share of the Common Stock as reported by The Nasdaq Stock Market or the
NYSE, as applicable, for the calendar quarters indicated:
 
   
<TABLE>
<CAPTION>
           ----------------------------------------------------
                QUARTER           HIGH        LOW        CLOSE
           ------------------    ------       ----       ------
<S>        <C>                   <C>          <C>        <C>
1995       First                  $11 1/8     $ 9 3/8     $ 9 3/4
           Second                  12 1/2       9 1/2      12 1/2
           Third                   12 1/2      11 5/8      12 1/2
           Fourth                  15 1/4      11 5/8      13 1/2
 
1996       First                   15 3/4      13          15 3/4
           Second                  20 3/4      15 3/4      20
           Third                   21          18 1/2      20
           Fourth                  24          20          23
 
1997       First                   29 1/2      22          25 1/2
           Second                  27 1/2      21 3/4      26 1/2
           Third                   41 7/8      26 3/16     41 7/8
           Fourth                  40 1/4      32 1/4      33 5/16
 
           First (through
1998       2/24)                   39 3/8      32 3/4      38 1/16
</TABLE>
    
 
                                       13
<PAGE>   14
 
                                 CAPITALIZATION
 
The table below sets forth the capitalization of the Company as of December 31,
1997. The information in the table below is qualified in its entirety by, and
should be read in conjunction with, the Company's Consolidated Financial
Statements and Notes thereto included elsewhere in this Prospectus.
 
<TABLE>
<CAPTION>
                                                                                 ------------
                                                                                    AS OF
                                                                                 DECEMBER 31,
                                                                                     1997
                                                                                 ------------
<S>                                                                              <C>
Dollars in thousands
Cash and cash equivalents                                                        $     19,419
                                                                                     ========
Notes payable(1)                                                                 $         30
                                                                                     --------
Shareholders' equity
  Common stock, 20,000,000 shares authorized, 11,517,113 shares outstanding(2)         32,378
  Retained earnings                                                                    96,849
  Cumulative translation adjustment                                                      (276)
                                                                                     --------
Total shareholders' equity                                                            128,951
                                                                                     --------
       Total capitalization                                                      $    128,981
                                                                                     ========
</TABLE>
 
- ---------------
 
(1) See Note 8 to Consolidated Financial Statements for a discussion of the
Company's outstanding debt. The Company expects to borrow, repay and reborrow
from time to time under revolving credit agreements amounts needed for
facilities expansion and improvement and general corporate purposes.
 
(2) Excludes an aggregate of 978,417 shares of Common Stock issuable on exercise
of stock options that were outstanding as of December 31, 1997. See
"Business -- Employees and Labor Relations."
 
                                       14
<PAGE>   15
 
                  SELECTED CONSOLIDATED FINANCIAL INFORMATION
 
The following table sets forth selected consolidated financial information with
respect to the Company for each of the five years ended December 31, 1993, 1994,
1995, 1996 and 1997, derived from the audited Consolidated Financial Statements
of the Company, the most recent three years of which appear elsewhere herein.
The data presented below should be read in conjunction with the Consolidated
Financial Statements and related Notes thereto and "Management's Discussion and
Analysis of Financial Condition and Results of Operations" included elsewhere
herein.
 
<TABLE>
<CAPTION>
                                   ------------------------------------------------------------------
      Dollars in thousands,                             YEARS ENDED DECEMBER 31,
      except per share data           1993         1994          1995          1996          1997
                                   ----------   -----------   -----------   -----------   -----------
<S>                                <C>          <C>           <C>           <C>           <C>
STATEMENT OF OPERATIONS DATA
Net sales                          $  113,923   $   151,290   $   167,958   $   202,409   $   246,074
Cost of sales                          72,387        96,984       109,368       124,394       149,279
                                     --------      --------      --------      --------      --------
Gross profit                           41,536        54,306        58,590        78,015        96,795
Selling expense                        12,137        14,714        17,110        20,104        23,113
General and administrative
  expense                              14,156        18,608        18,512        25,036        30,053
Compensation related to stock
  plans(1)(2)                             693         6,909            61           180           305
                                     --------      --------      --------      --------      --------
Income from operations                 14,550        14,075        22,907        32,695        43,324
Interest income (expense), net           (997)         (559)          142           595           429
                                     --------      --------      --------      --------      --------
Income before income taxes and
  minority interest                    13,553        13,516        23,049        33,290        43,753
Provision for income taxes              5,517         8,098         8,927        13,569        17,767
Minority interest                          66           (33)           --            --            --
                                     --------      --------      --------      --------      --------
Net income                         $    7,970   $     5,451   $    14,122   $    19,721   $    25,986
                                     ========      ========      ========      ========      ========
Net income per share
  Basic                            $     1.07   $       .56   $      1.25   $      1.73   $      2.26
  Diluted(3)                       $      .89   $       .51   $      1.23   $      1.68   $      2.17
Weighted average shares
  outstanding
  Basic                             7,495,894     9,717,004    11,316,673    11,424,945    11,474,592
  Diluted(3)                        9,051,425    10,561,641    11,460,567    11,755,184    11,965,950
</TABLE>
 
<TABLE>
<CAPTION>
                                   ------------------------------------------------------------------
                                                           AS OF DECEMBER 31,
                                      1993         1994          1995          1996          1997
                                   ----------   -----------   -----------   -----------   -----------
<S>                                <C>          <C>           <C>           <C>           <C>
BALANCE SHEET DATA
Working capital                    $   24,526   $    44,127   $    51,984   $    70,676   $    83,297
Property, plant and equipment,
  net                                  13,551        20,843        26,420        28,688        42,925
Total assets                           58,325        80,311        96,642       122,521       150,765
Total debt                             14,998            --            20            --            30
Total liabilities                      25,487        13,789        15,089        20,224        21,814
Total shareholders' equity(1)          32,535        66,522        81,553       102,297       128,951
</TABLE>
 
                                       15
<PAGE>   16
 
(continued from preceding page)
 
<TABLE>
<CAPTION>
                                   ------------------------------------------------------------------
                                                        YEARS ENDED DECEMBER 31,
                                      1993         1994          1995          1996          1997
                                   ----------   -----------   -----------   -----------   -----------
<S>                                <C>          <C>           <C>           <C>           <C>
OTHER DATA
EBITDA(4)                          $   17,656   $    24,820   $    28,260   $    39,927   $    50,140
Net cash provided by operating
  activities                            4,366         9,613        13,398        24,610        21,133
Net cash used in investing
  activities                           (4,480)      (11,096)      (13,109)      (12,256)      (21,824)
Net cash provided by financing
  activities                            1,778         5,484           855           506           294
Capital expenditures                    3,656         9,939        10,050         7,364        16,548
Depreciation and amortization           2,636         3,973         5,291         7,198         6,712
</TABLE>
 
- ---------------
(1) In 1994, a reorganization was effected to consolidate shareholdings in
Simpson Strong-Tie and Simpson Dura-Vent (the "1994 Reorganization"). As part of
the 1994 Reorganization, the Company recorded a one-time, non-cash,
non-deductible compensation charge of approximately $6.4 million, resulting from
an exchange of Company shares for outstanding SST and SDV shares held by
employees. After giving affect to all components of the 1994 Reorganization,
including this non-cash compensation charge, shareholders' equity increased by
$1.1 million. The Company also recorded in 1994 other non-cash compensation
charges aggregating approximately $400,000 and a cash compensation charge of
approximately $100,000.
(2) The year ended December 31, 1993, includes $470,000 in one-time, non-cash
expense for options earned by employees pursuant to compensation arrangements
with exercise prices less than fair value. The balance for the year 1993
includes dividends paid to and repurchases of shares of common stock from
employees, which shares are deemed to be stock options (deemed options) for
financial reporting purposes.
(3) For purposes of calculating net income per share, common stock and common
stock equivalent shares issued during the 12-month period prior to the Company's
initial public offering in 1994 have been included as if they were outstanding
for all periods presented using the treasury stock method.
(4) Represents net income before minority interest, income taxes, interest
income (expense), net, depreciation and amortization, and non-cash compensation
related to stock plans as described in notes (1) and (2) above.
 
                                       16
<PAGE>   17
 
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
                OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
The following is a discussion and analysis of the consolidated financial
condition and results of operations for the Company for the years ended December
31, 1995, 1996 and 1997, and of certain factors that may affect the Company's
prospective financial condition and results of operations. The following should
be read in conjunction with the Consolidated Financial Statements and related
Notes appearing elsewhere herein.
 
Certain matters discussed below are forward-looking statements that involve
risks and uncertainties, certain of which are discussed in this Prospectus and
in reports filed by the Company with the Securities and Exchange Commission. See
"Incorporation of Certain Documents by Reference," "Additional Information" and
"Risk Factors." Actual results might differ materially from results suggested by
any forward-looking statements in this Prospectus.
 
OVERVIEW
 
   
From 1995 through 1997, annual net sales of the Company increased 46.5% from
$168.0 million in 1995 to $246.1 million in 1997. The increase in net sales
resulted primarily from increased geographic distribution and a broadening of
the Company's customer base and product lines, both internally and through
acquisitions. Net sales increased from 1995 to 1997 in all regions of the United
States, with above average rates of growth in the Midwestern and Northeastern
markets. Expansion into overseas markets also contributed to the net sales
growth over the last three years. During the year ended December 31, 1997, gross
profit margin increased to 39.3%, from 34.9% in 1995. The increase over the past
two years was due primarily to lower material costs as a percentage of net
sales, LIFO gains recorded in 1996 and 1997 as compared to a LIFO loss in 1995
and lower overhead costs as a percentage of net sales. Income from operations as
a percentage of net sales increased to 17.6% in 1997 from 13.6% in 1995, despite
a 0.5% increase in selling, general and administrative costs as a percentage of
net sales.
    
 
RESULTS OF OPERATIONS
 
The following table sets forth, for the years indicated, the percentage of net
sales of certain items in the Company's consolidated statements of operations.
 
<TABLE>
<CAPTION>
                                                                  -----------------------------
                                                                    YEARS ENDED DECEMBER 31,
                                                                  1995        1996        1997
                                                                  -----       -----       -----
<S>                                                               <C>         <C>         <C>
Net sales                                                         100.0%      100.0%      100.0%
Cost of sales                                                      65.1%       61.5%       60.7%
                                                                  -----       -----       -----
Gross profit                                                       34.9%       38.5%       39.3%
Selling expense                                                    10.2%        9.9%        9.4%
General and administrative expense                                 11.0%       12.4%       12.2%
Compensation related to stock plans                                   *         0.1%        0.1%
                                                                  -----       -----       -----
Income from operations                                             13.6%       16.1%       17.6%
Interest income, net                                                0.1%        0.3%        0.2%
                                                                  -----       -----       -----
Income before income taxes                                         13.7%       16.4%       17.8%
Provision for income taxes                                          5.3%        6.7%        7.2%
                                                                  -----       -----       -----
Net income                                                          8.4%        9.7%       10.6%
                                                                  =====       =====       =====
</TABLE>
 
- ---------------
 
* Less than 0.05%
 
COMPARISON OF THE YEARS ENDED DECEMBER 31, 1997 AND 1996
 
Net Sales
 
Net sales increased 21.6% to $246.1 million in 1997 from $202.4 million in 1996.
Net sales of Simpson Strong-Tie's products increased 25.3% to $190.6 million in
1997, while net sales of Simpson Dura-Vent's products
 
                                       17
<PAGE>   18
 
increased by 10.3% to $55.5 million in 1997. SDV accounted for approximately
22.6% of the Company's total net sales, a decrease from 24.9% in 1996. The
increases in net sales at both SST and SDV were primarily due to volume
increases, with relatively small increases in average prices. The increase in
net sales reflected sales growth throughout the United States, particularly in
California and the Northeastern region of the country. International sales
increased at a substantial rate, with a significant portion of this increase
resulting from the businesses acquired earlier in the year. Contractor
distributors and homecenters were the fastest growing connector sales channels.
The growth rate of Simpson Strong-Tie's epoxy, seismic and engineered wood
product sales remained strong, and SST's acquisition of the Isometric Group's
line of mechanical anchor products also contributed significantly to the
increase in net sales. Simpson Dura-Vent's sales of chimney products and
Direct-Vent products experienced above-average growth.
 
Gross Profit
 
Gross profit increased 24.1% to $96.8 million in 1997 from $78.0 million in
1996. As a percentage of net sales, gross profit increased to 39.3% in 1997 from
38.5% in 1996. The increase was primarily due to a reduction as a percentage of
net sales in the non-material components of cost of sales, including
depreciation on factory equipment, research and development costs, labor,
factory overhead costs and shipping and freight. These costs decreased as a
percentage of net sales primarily due to the improved absorption of fixed
components of these costs because of the increased sales volume. Material costs
as a percentage of net sales also decreased slightly relative to 1996. These
improvements were offset somewhat by a smaller LIFO gain recorded in 1997 as
compared to 1996.
 
Selling Expense
 
Selling expense increased 15.0% to $23.1 million in 1997 from $20.1 million in
1996, but decreased as a percentage of net sales. The increase was primarily due
to higher personnel costs, including agent commissions, related to the increase
in the size of the sales force, which was expanded in 1997 to include
manufacturers' representatives who distribute the Company's mechanical anchor
product line. This increase was offset slightly by reduced spending on
advertising and promotional materials.
 
General and Administrative Expense
 
General and administrative expenses increased 20.0% to $30.1 million in 1997
from $25.0 million in 1996, and increased as a percentage of net sales. The
increase was primarily due to increased cash profit sharing, as a result of
higher operating profit, as well as higher personnel costs, including those
associated with the two acquisitions earlier in the year. Partially offsetting
the increase was a decrease in expenses because of the 1996 write-off of
intangible assets related to Simpson Strong-Tie's operations in the UK.
 
Acquired European Operations
 
The Company recorded an after-tax net loss in its combined European operations
of $2.4 million in 1997, including $1.0 million in intercompany interest
charges, compared to after-tax net losses of $2.8 million in 1996. These losses
are primarily associated with the Company's UK operations. Depreciation on
purchased capital equipment and administrative and other overhead costs incurred
related to the growing operations contributed significantly to the losses. The
Company expects the losses in the UK to continue through at least 1998.
 
COMPARISON OF THE YEARS ENDED DECEMBER 31, 1996 AND 1995
 
Net Sales
 
Net sales in 1996 increased 20.5% to $202.4 million from $168.0 million in 1995.
Net sales of Simpson Strong-Tie products increased 19.8% to $152.1 million in
1996, while net sales of Simpson Dura-Vent products increased by 22.8% to $50.3
million in 1996. SDV accounted for 24.9% of the Company's total net sales, up
from 24.4% in 1995. The increases in net sales at both SST and SDV were
primarily due to volume increases, with relatively small increases in average
prices. The increase in net sales occurred throughout the United States, but was
particularly strong in the Northeastern region of the country, primarily as a
result of increased home center and dealer
 
                                       18
<PAGE>   19
 
distributor business. Sales in California, however, grew at a rate substantially
below the overall growth rate. The Company also had above-average growth in
export sales, a small but steadily growing part of both the connector and
venting businesses. The sales growth rate of DIY, epoxy and seismic products led
SST sales, and sales of Direct-Vent products, now sold both to OEMs and through
distributors, continued to experience strong growth.
 
Gross Profit
 
Gross profit in 1996 increased 33.2% to $78.0 million from $58.6 million in
1995. Gross profit as a percentage of net sales increased to 38.5% in 1996 from
34.9% in 1995. The increase was primarily due to three factors. The first factor
was a substantial benefit attributable to the LIFO gain for the year as compared
to a LIFO loss in the prior year. Second, the non-material component of cost of
sales, which includes research and development costs, direct and indirect labor,
factory costs and shipping and freight, decreased slightly as a percentage of
net sales primarily due to the increased absorption of the fixed components of
these costs resulting from increased sales volume. Finally, raw material costs
decreased somewhat relative to 1995. Labor costs as a percentage of net sales
remained relatively flat during 1996.
 
Selling Expense
 
In 1996, selling expense increased 17.5% to $20.1 million from $17.1 million in
1995. The increase was primarily due to higher advertising and sales promotion
expenses, a large percentage of which was targeted toward the retail business.
The Company also hired several new Retail Specialists to support the increased
home center and DIY business and added several sales people. In addition, the
increased sales at Simpson Dura-Vent resulted in proportionately higher
commissions and other related costs.
 
General and Administrative Expense
 
General and administrative expense increased 35.2% to $25.0 million in 1996 from
$18.5 million in 1995. The increase was primarily due to higher cash profit
sharing, as a result of higher operating profit, and the write-off of intangible
assets related to the Company's UK operations (see "Acquired Operations" below).
Also contributing to the increase in general and administrative expense were
increased personnel and overhead costs resulting from the addition of
administrative staff, including those at the businesses acquired in the second
half of 1995.
 
Interest Income (Expense), net
 
The Company had interest income of $595,180 in 1996 as compared to $141,535 in
1995. The increase resulted from the higher cash and short-term investment
balances during the year.
 
Provision for Income Taxes
 
The Company's effective tax rate increased to 40.8% in 1996 from 38.7% in 1995.
The lower 1995 tax rate was principally a result of the full recognition of
California investment tax credits on equipment purchased for manufacturing and
research and development.
 
Acquired Operations
 
The Company's United Kingdom operations continue to report losses. While sales
there have increased substantially since 1995, largely because of acquisitions,
current gross margins are substantially lower than those of the rest of the
Company's operations.
 
In December 1996, the Company completed the purchase of the assets, including
$675,000 in equipment, of the Builders Products Division of MiTek Industries
Ltd. for approximately $1.0 million. As a result of this acquisition, the
Company concluded that additional manufacturing space was needed and that the
consolidation of its UK facilities into a single location was advisable. In
connection with this consolidation, the Company wrote off approximately $1.1
million of intangible assets associated with the separate UK operations. The
Company recorded after-tax net losses in its European operations, including
intercompany interest charges and the $1.1 million charge discussed above, of
approximately $2.8 million in 1996 compared to after-tax net losses of $1.5
million in 1995.
 
                                       19
<PAGE>   20
 
The losses were primarily due to depreciation on purchased capital equipment and
administrative and other overhead costs incurred as a result of the growing
operations. The Company expects these losses to continue through at least 1998.
 
QUARTERLY RESULTS
 
The following table sets forth unaudited consolidated statement of income data
for each quarter of 1996 and 1997. This quarterly information has been prepared
on the same basis as the annual consolidated financial statements and, in the
opinion of management, reflects all adjustments, consisting only of normal
recurring adjustments, necessary to state fairly the information set forth
herein. The operating results for any quarter are not necessarily indicative of
results for any future period.
 
<TABLE>
<CAPTION>
                                  ----------------------------------------------------------------------------
                                                  1996                                      1997
                                  -------------------------------------     -------------------------------------
Dollars in thousands, except per   FIRST    SECOND     THIRD    FOURTH       FIRST    SECOND     THIRD    FOURTH
           share data             QUARTER   QUARTER   QUARTER   QUARTER     QUARTER   QUARTER   QUARTER   QUARTER
                                  -------   -------   -------   -------     -------   -------   -------   -------
<S>                               <C>       <C>       <C>       <C>         <C>       <C>       <C>       <C>
Net sales                         $43,457   $51,760   $57,129   $50,063     $51,927   $65,555   $68,825   $59,767
Cost of sales                      28,356    31,509    34,441    30,088      32,609    39,228    40,364    37,079
                                  -------    ------    ------    ------      ------    ------    ------    ------
Gross profit                       15,101    20,251    22,688    19,975      19,318    26,327    28,461    22,688
Selling expense                     4,510     5,463     4,929     5,202       5,208     6,367     5,893     5,645
General and administrative
  expense                           5,128     6,225     7,034     6,648       6,226     8,078     8,665     7,084
Compensation related to stock          --        --        --       180          --        --       290        15
                                  -------    ------    ------    ------      ------    ------    ------    ------
Income from operations              5,463     8,563    10,725     7,945       7,884    11,882    13,613     9,944
Interest income (expense), net         54        97       175       269         160       (18)      106       181
                                  -------    ------    ------    ------      ------    ------    ------    ------
Income before income taxes          5,517     8,660    10,900     8,214       8,044    11,864    13,719    10,125
Provision for income taxes          2,254     3,492     4,507     3,316       3,287     4,843     5,531     4,106
                                  -------    ------    ------    ------      ------    ------    ------    ------
Net income                        $ 3,263   $ 5,168   $ 6,393   $ 4,898     $ 4,757   $ 7,021   $ 8,188   $ 6,019
                                  =======    ======    ======    ======      ======    ======    ======    ======
</TABLE>
 
The Company's results of operations fluctuate from quarter to quarter. The
fluctuations are caused by various factors, primarily the increase in
construction activity during warmer months of the year. Historically, demand for
the Company's products has tended to be somewhat higher in the second and third
quarters and somewhat lower in the first and fourth quarters.
 
LIQUIDITY AND SOURCES OF CAPITAL
 
The Company's liquidity needs arise principally from working capital
requirements, capital expenditures and asset acquisitions. During the three
years ended December 31, 1997, the Company relied primarily on internally
generated funds and its credit facilities to finance these needs. The Company's
working capital requirements are seasonal with the highest working capital needs
typically occurring in the second and third quarters of the year. Cash and cash
equivalents were $19.4 million and $19.8 million at December 31, 1997 and 1996,
respectively. Working capital was $83.3 million and $70.7 million at December
31, 1997 and 1996, respectively. As of December 31, 1997, the Company had no
significant debt and had available to it unused credit facilities of
approximately $22.9 million.
 
The Company had cash flows from operating activities of $21.1 million, $24.6
million and $13.4 million for 1997, 1996 and 1995, respectively. In 1997, cash
was provided by net income of $26.0 million, noncash expenses (such as
depreciation and amortization) of $6.7 million and increases in accrued profit
sharing and other accrued liabilities totaling $1.6 million. The Company's
primary operating cash flow requirements resulted from increased levels of
inventory and accounts receivable that are required as the Company's sales
increase. In 1997, 1996 and 1995, the Company used cash of $9.1 million, $7.7
million and $5.6 million, respectively, to fund accounts receivable and
inventory requirements. In addition, trade accounts payable balances decreased
and the deferred tax asset balance increased in 1997, accounting for an
aggregate use of an additional $3.4 million in cash. The balance of the cash
used in 1997 resulted from changes in the other current asset and liability
accounts.
 
Cash used in investing activities was $21.8 million, $12.3 million and $13.1
million for 1997, 1996 and 1995, respectively. Capital expenditures, related
primarily to expanding capacity, increased in 1997 to $16.5 million from
 
                                       20
<PAGE>   21
 
$7.4 million in 1996. Included in the 1997 investing activities are the
Company's two acquisitions for a total of $9.3 million. The first was an equity
purchase for $7.6 million plus an earnout based on future sales increases of
three Canadian companies and a related U.S. company, the Isometric Group, that
manufactures and distributes a line of mechanical anchors and related products.
The second was the purchase of the remaining 66% equity in Patrick Bellion,
S.A., a French manufacturer of connector products, for $1.7 million. In
addition, $7.3 million in cash was used for real estate and related purchases in
1997. Partially offsetting these purchases was the sale of a short-term
investment providing nearly $4.0 million in cash.
 
Financing activities provided net cash of $0.3 million, $0.5 million and $0.9
million in 1997, 1996 and 1995, respectively. The cash was provided primarily
through the exercise of stock options by current and former employees of the
Company.
 
The Company believes that cash generated by operations, borrowings available
under its existing credit agreements, the majority of which have been renewed
through June 1998, and other available financing will be sufficient for the
Company's working capital needs and planned capital expenditures through at
least 1998.
 
INFLATION
 
The Company believes that the effect of inflation on the Company has not been
material in recent years, as inflation rates have remained low.
 
                                       21
<PAGE>   22
 
                                    BUSINESS
 
OVERVIEW
 
The Company, through its subsidiary, Simpson Strong-Tie, designs, engineers and
is a leading manufacturer of wood-to-wood, wood-to-concrete and wood-to-masonry
connectors, and through its subsidiary, Simpson Dura-Vent, designs, engineers
and manufactures venting systems for gas and wood burning appliances. The
Company markets its products to the residential construction, light industrial
and commercial construction, remodeling and do-it-yourself ("DIY") markets. The
Company believes that SST benefits from strong brand name recognition among
architects and engineers who frequently specify in building plans the use of SST
products, and that SDV benefits from strong brand name recognition among
contractors, dealers, distributors and original equipment manufacturers ("OEMs")
to which SDV markets its products. The Company has continuously manufactured
structural connectors since 1956.
 
From 1993 through 1997, the Company's annual net sales grew from $113.9 million
to $246.1 million, a compound annual growth rate of 21.2%. During the same
period, the Company's annual net income grew from $8.0 million to $26.0 million,
a compound annual growth rate of 34.4%. Growth has been derived primarily from
frequent new product introductions, expansion into new geographic markets and
growth of distribution channels.
 
Connectors produced by Simpson Strong-Tie typically are steel devices that are
used to strengthen, support and connect joints in residential and commercial
construction and DIY projects. These products enhance the safety and durability
of the structures in which they are installed and can save time and labor costs
for the contractor. SST's connector products increase structural integrity and
improve structural resistance to seismic, wind and other forces. Applications
range from building framing to deck construction to DIY projects. SST produces
and markets more than 1,300 standard connector products in addition to products
that it manufactures to custom specifications requested by architects and
engineers.
 
Simpson Dura-Vent's venting systems are used to vent gas furnaces and water
heaters, gas fireplaces and stoves, wood burning stoves and pellet stoves. SDV's
metal vents, chimneys and chimney liner systems exhaust the products of
combustion to the exterior of the building, and some products introduce outside
air into the appliance. SDV designs its products for ease of assembly and safe
operation and to achieve a high level of performance. SDV produces and markets
several hundred different venting products and systems.
 
The Company emphasizes continuous new product development and often obtains
patent protection for its new products. The Company's products are marketed in
all 50 states of the United States and in England, France, Germany, Canada,
Mexico, Japan and Australia. Both Simpson Strong-Tie and Simpson Dura-Vent
products are distributed through a contractor and dealer distributor network,
home centers and OEMs.
 
The Company has developed and uses automated manufacturing processes. Its
innovative manufacturing systems and techniques have allowed it to control
manufacturing costs, even while developing both new products and products that
meet customized requirements and specifications. The Company's development of
specialized manufacturing processes has also permitted increased operating
flexibility and enhanced product design innovation. The Company has developed a
quality management system that employs numerous quality-control procedures.
Since 1996, SST's quality management system has been registered under ISO 9001.
The Company has 11 manufacturing locations in the United States, Canada, France
and the United Kingdom.
 
The Company is a California corporation and was reorganized in 1994 as a holding
company for Simpson Strong-Tie and Simpson Dura-Vent.
 
INDUSTRY AND MARKET TRENDS
 
Based on trade periodicals, participation in trade and professional associations
and communications with governmental and quasi-governmental organizations and
customers and suppliers, the Company believes that a variety of events and
trends have resulted in significant developments in the markets that the Company
serves. Some of these events and trends are discussed below.
 
                                       22
<PAGE>   23
 
Increased Awareness of Need for Building Safety
 
Recent natural disasters throughout the world have focused attention on safety
concerns relating to the structural integrity of homes and other buildings. The
1995 earthquake in Kobe, Japan, the 1994 earthquake in Northridge, California,
the 1989 Loma Prieta earthquake in Northern California, Hurricanes Hugo in 1989
and Andrew in 1992 in the Southeast, and other less cataclysmic natural
disasters damaged and destroyed innumerable homes and other buildings, resulting
in heightened consciousness of the fragility of some of those structures.
 
In recent years, architects, engineers, model code agencies, contractors,
building inspectors and legislators have continued efforts to improve structural
integrity and safety of homes and other buildings in the face of disasters of
various types, including seismic events, storms and fires. Based on ongoing
participation in trade and professional associations and communications with
governmental and quasi-governmental regulatory agencies (see "Business --
Regulation"), the Company believes that building codes are being strengthened
and that their enforcement is becoming more rigorous. The Company's products are
designed to respond to increasing demand resulting from these trends.
 
Increased Environmental Awareness
 
The requirements of the Endangered Species Act, the Federal Lands Policy
Management Act and the National Forest Management Act have resulted in
increasingly limited amounts of timber available for harvest from public lands.
This has contributed to an increase in lumber prices and a concomitant increase
in the use of engineered wood products. Engineered wood products, which
substitute for strong, clear-grained lumber historically obtained from logging
older, large-diameter trees, have been developed to conserve lumber. Engineered
wood products frequently require specialized connectors. Sales of Simpson
Strong-Tie's engineered wood connector products increased significantly in 1996
and 1997.
 
Concerns about energy conservation and air quality have led to increasing
recognition of the advantages of natural gas as a heating fuel, including its
abundance and clean burning characteristics. Use of natural gas for home heating
has been increasing in the United States. According to the Census Bureau, the
share of new single-family houses in 1996 heated with natural gas was 69%, a
slight increase from 67% in 1994. Sales of gas fireplaces have increased in
recent years relative to those of traditional wood burning fireplaces.
Traditional wood burning fireplaces negatively affect both indoor and outdoor
air quality. In contrast, direct vent gas fireplaces draw air for combustion
from outdoors (through the double wall venting system) and feature sealed glass
doors that reduce indoor air contamination. In the past, Simpson Dura-Vent
products have not been sold into the traditional masonry and manufactured
fireplace market. The recent trend from wood to gas fireplaces is viewed as a
significant opportunity for SDV's gas venting products.
 
Expanding Home Center Markets and DIY Activity
 
The Company has developed its distribution through home centers throughout the
United States. The National Retail Hardware Association estimates that there are
44,500 home centers and lumber and building material outlets in the United
States. The Company's sales to home centers increased significantly in 1996 and
1997.
 
BUSINESS STRATEGY
 
The Company designs, manufactures and sells products that are of high quality
and performance, easy to use and cost-effective for customers. The Company
provides rapid delivery of its products and prompt engineering and sales
support. Based on its communications with customers, engineers, architects,
contractors and other industry participants, the Company believes that its
products have strong brand name recognition, and the Company seeks to continue
to develop the value of its brand names through a variety of customer-driven
strategies. Information provided by customers has led to the development of many
of the Company's products, and the Company expects that customer needs will
continue to shape the Company's product development, marketing and services.
 
                                       23
<PAGE>   24
 
Increase Specification by Architects and Engineers
 
Specification in architects' and engineers' plans and drawings influences which
products will be used for particular purposes and therefore is key to the use of
the Company's products in construction projects. The Company encourages
architects and engineers to specify the installation of the Company's products
in projects they design and supervise, and encourages acceptance of the
Company's products by construction contractors. The Company maintains frequent
contacts with architects, engineers and contractors, as well as private
organizations that provide information to building code officials, both to
inform them regarding the quality, proper installation, capabilities and value
of the Company's products and to update them about product modifications and new
products that may be useful or needed. The Company sponsors seminars to inform
architects, engineers and building officials on appropriate use and proper
installation of the Company's products.
 
Expand Product and Distribution Coverage
 
The Company seeks to expand its product and distribution coverage through
several channels:
 
Distributors. The Company regularly evaluates its distribution coverage and
service levels provided by its distributors and from time to time modifies its
distribution strategy and implements changes to address weaknesses and
opportunities. The Company has various programs to evaluate distributor product
mix and conducts promotions to encourage distributors to add Company products
that complement their mix of product offerings in their markets.
 
Through its efforts to increase specifications by architects and engineers, and
through increasing the number of products sold to particular contractors, the
Company seeks to increase sales to distributors that serve building contractors.
The Company continuously seeks to expand the number of contractors served by
each distributor through such sales efforts as demonstrations of product
cost-effectiveness and information programs.
 
Home Centers. The Company intends to continue to increase penetration of the DIY
markets by solicitation of home centers. The Company's Sales Representatives and
Retail Specialists maintain on-going contact with home centers to provide timely
product availability and product knowledge training. To satisfy specialized
requirements of the home center market, the Company has developed extensive bar
coding and merchandising aids and has concentrated a portion of its research
efforts into the development of DIY products.
 
OEM Relationships. The Company works closely with manufacturers of engineered
wood products and OEMs in developing and expanding the application and sales of
Simpson Strong-Tie's engineered wood connector products and Simpson Dura-Vent's
gas, wood and pellet stove venting products. SST has relationships with several
of the largest manufacturers of engineered wood products, and SDV has OEM
relationships with several major gas fireplace and gas stove manufacturers.
 
Continue Geographic Expansion of Customer Base
 
The Company is expanding its established facilities outside California to
increase its presence and sales in markets east of the Rocky Mountains. During
the last five years, the Company has expanded or has planned to expand nearly
all of its manufacturing and warehouse facilities. Sales in the 37 states east
of the Rocky Mountains grew approximately 44% from 1995 to 1997 and represented
approximately 48% of the Company's 1997 domestic sales. In the last four years,
the Company commenced manufacturing in England, opened a warehouse facility in
Western Canada, purchased manufacturers in Eastern Canada and in France, made an
equity investment in a product design and distribution company in Germany and
entered into a distribution arrangement in Japan. The European investments are
intended to establish a presence in the European Community through companies
with existing customer bases and through servicing U.S.-based customers
operating there. The Company intends to continue to pursue and expand operations
outside the United States.
 
Provide Rapid Delivery of High Quality Products to Customers
 
The Company's goal is to manufacture and warehouse its products in geographic
proximity to its markets to provide availability and rapid delivery of products
to customers and prompt response to customer requests for specially
 
                                       24
<PAGE>   25
 
designed products and services. With respect to the DIY and dealer markets, the
Company's strategy is to keep the customer's retail stores continuously stocked
with adequate supplies of the full line of the Company's products that those
stores carry. The Company manages its inventory to assure continuous product
availability. Most customer orders are filled within a few days. High levels of
manufacturing automation and flexibility allow the Company to maintain its
quality standards while continuing to provide prompt delivery. See "Management's
Discussion and Analysis of Financial Condition and Results of Operations."
 
Create New Proprietary Products Responsive to Customer Needs
 
The Company's product research and development is based largely on needs that
customers communicate to the Company. The Company typically has developed 10 to
15 new products annually (some of which may be produced in a range of sizes).
The Company's strategy is to develop new products on a proprietary basis where
possible. Of more than 80 patents that the Company owns, 70 cover products that
the Company currently manufactures and markets. The Company has filed 39 patent
applications that are pending.
 
Acquire Complementary Product Lines
 
The Company's long-term strategy is to develop, acquire or invest in product
lines or businesses that (a) complement the Company's existing product lines,
(b) can be marketed through its existing distribution channels, (c) might
benefit from use of the Simpson Strong-Tie and Simpson Dura-Vent brand names,
and (d) are responsive to needs of the Company's customers.
 
SIMPSON STRONG-TIE
 
Overview
 
Connectors produced by Simpson Strong-Tie typically are steel devices that are
used to strengthen, support and connect joints in residential and commercial
construction and DIY projects. These products enhance the safety and durability
of the structures in which they are installed and can save time and labor costs
for the contractor. SST's connector products increase structural integrity and
improve structural resistance to seismic, wind and other forces. Applications
range from building framing to deck construction to DIY projects. SST produces
and markets more than 1,300 standard connector products in addition to products
that it manufactures to custom specifications requested by architects and
engineers.
 
In the United States, connector usage developed faster in the West than
elsewhere due to the low cost and abundance of timber and to local construction
practices. Increasingly, the market has been influenced both by a growing
awareness that the devastation caused by seismic, wind and other disasters can
be reduced through improved building codes and construction practices and by
environmental concerns that contribute to the increasing cost and reduced
availability of wood. Most Simpson Strong-Tie products are listed by recognized
building standards agencies as complying with model building codes and are
specified by architects and engineers for use in projects they are designing or
supervising. The engineered wood products industry is developing in response to
concerns about the availability of wood, and the Company believes that SST is
the leading supplier of connectors for use with engineered wood products. SST
operates manufacturing and warehouse facilities in California, Texas, Ohio,
Florida, Illinois, British Columbia, Ontario, England and France.
 
Products
 
Simpson Strong-Tie is a recognized brand name in the markets it serves. Over a
quarter of SST's 1997 revenues are derived from products that are protected by
patents. SST manufactures and markets three primary categories of connector
products: wood-to-wood, wood-to-concrete and wood-to-masonry. SST also markets
specialty screws and nails for proper installation of certain of its connector
products. For tying wood members to the foundation, SST has designed and
currently markets a line of anchor bolts and the associated parts for aligning
the anchor bolts, as well as threaded rod, epoxy and mechanical anchors, which
have seismic, retrofit and remodeling applications for both new construction and
DIY markets.
 
                                       25
<PAGE>   26
 
Almost all of Simpson Strong-Tie's products are listed by recognized model
building code agencies. To achieve such listings, SST conducts extensive product
testing, which is witnessed and certified by independent testing engineers. The
tests also provide the basis for publication of load ratings for SST structural
connectors, and this information is used by architects, engineers, contractors
and homeowners. The information is useful across the range of applications of
SST's products, from the deck constructed by a homeowner to a multi-story
structure designed by an architect or engineer in an earthquake zone.
 
Simpson Strong-Tie also manufactures connector products specifically designed
for use with engineered wood products, such as wood I-joists. With increased
timber costs and reduced availability of trees suitable for making traditional
solid sawn lumber, construction with engineered wood products has increased
substantially in the last three years. Over the same period, SST's net sales of
engineered wood connectors through dealer and contractor distributors and
engineered wood product manufacturers have also increased significantly.
 
New Product Development
 
Simpson Strong-Tie commits substantial resources to engineering and new product
development. The majority of SST's products have been developed through SST's
internal research and development program. Of the 65 U.S. and 15 foreign patents
that SST owns, 67 cover products that SST currently manufactures and markets.
SST typically has developed 10 to 15 new products each year. SST's research and
development expense for the three years ended December 31, 1995, 1996 and 1997,
was $922,000, $1,025,000 and $957,000, respectively. As part of the new product
development process, SST engineers, in cooperation with sales and marketing
staff, meet regularly with architects, engineers, building inspectors, code
officials and customers. Several new products derived from existing product
lines are developed annually. SST recently developed and introduced a line of
powder-coat painted shelf brackets primarily for the DIY market, high-strength
chemical epoxy anchor systems, and reduced deflection hold-downs and associated
fasteners. The Company believes that existing distribution channels are
receptive to product line extensions, thereby enhancing SST's ability to enter
new markets.
 
Sales and Marketing
 
Sales Organization. Simpson Strong-Tie's sales and marketing programs are
implemented through SST's branch system. SST currently maintains branches in
Northern and Southern California, Texas, Ohio, England and France. Each branch
is served by its own sales force as well as manufacturing, warehouse and office
facilities. Each branch is responsible for a broad geographic area. Branch
managers have significant autonomy, which includes setting sales and marketing
strategies. Each domestic branch is an independent profit center with a cash
profit sharing bonus program based on its own performance. At the same time, the
domestic branches closely integrate their manufacturing activities to enhance
product availability. Branch sales forces in the U.S. are supported by marketing
managers in the home office in Pleasanton, California. The sales force maintains
close working relationships with customers, develops new business, calls on
architects, engineers and building officials and participates in a range of
educational seminars.
 
Distribution Channels. Simpson Strong-Tie sells its products through an
extensive distribution system comprising dealer distributors supplying thousands
of retail locations nationwide, contractor distributors (primarily on the West
Coast), home centers (including more than 1,800 stores across the United
States), manufacturers of engineered wood products, and specialized contractors
such as roof framers. SST's DIY and dealer products are used to build projects
such as decks, patio covers and shelf and bench systems. In 1996, SST completed
an agreement with a Japanese trading partner to distribute its products in
Japan. SST has also received C-Mark equivalency clearance from the Japanese
building code authorities, which is expected to facilitate acceptance of its
products into that market. The Company believes that SST's increasing
diversification into new and growing markets has reduced its vulnerability to
construction industry cycles. In addition to its branches, SST operates
manufacturing and/or warehouse facilities in Florida, Illinois and Canada.
 
Customer Service. Simpson Strong-Tie dedicates substantial resources to customer
service. Every year, SST produces numerous publications and point-of-sale
marketing aids to serve specifiers, distributors, retailers and users. These
publications include SST's general catalog, as well as various specific
catalogs, such as those for its epoxy products and the engineered wood and
plated truss industries. The catalogs and publications describe the
 
                                       26
<PAGE>   27
 
products and provide load and installation information. SST publishes a
newsletter, Connector Update, providing technical, installation and other
information, as well as publications addressing seismic and hurricane conditions
and the DIY market. To serve users in the U.S. and elsewhere who do not speak
English, SST employs bilingual sales people and prints some of its publications
in other languages.
 
Simpson Strong-Tie's engineers not only design and test products, but also
provide engineering support for customers. This support might range from the
discussion of a load value in a catalog to testing a unique application for an
existing product. SST's sales force communicates with customers in each of its
marketing channels, through its publications, through seminars and through
frequent calls.
 
Prompt Delivery of Products. Based on its communications with customers, Simpson
Strong-Tie believes that its products are essential to its customers'
businesses, and it is SST's policy to ship products ordered within a few days of
receiving the order. Many of SST's customers are contractors that require rapid
delivery of needed products. Home centers and dealers also require superior
service, because of fluctuating demand. To satisfy these requirements, SST
maintains high inventory levels, has redundant manufacturing capability and some
multiple dies to produce the same parts, and maintains computer sales and
inventory control and forecasting capability throughout its nationwide network
of factories and warehouses. The Company also has special programs for
contractors intended to ensure the prompt and reliable manufacture and delivery
of custom products.
 
Keeping the Racks Full. Simpson Strong-Tie believes that dealer and home center
sales of SST products are significantly greater when the bins and racks at large
dealer and home center locations are adequately stocked with appropriate
products. Various retailers carry varying numbers of different SST products and
SST's Retail Specialists are engaged in ongoing efforts to inform retailers
about other SST products that can be used in their specific markets and to
encourage them to add these products to better meet their customers' needs.
Achieving these objectives requires teamwork and significant inventory
commitments between SST and the distributors and retailers. Retail Specialists
are playing a significant role in keeping the racks full and extending the
product lines at the large dealer and home center level. They help retailers
order product, set up merchandising systems, stock shelves, hold product
seminars and provide SST with daily information that is used to improve service
and product mix.
 
SIMPSON DURA-VENT
 
Overview
 
Simpson Dura-Vent's venting systems are used to vent gas furnaces and water
heaters, gas fireplaces and stoves, wood burning stoves and pellet stoves. SDV's
metal vents, chimneys and chimney liner systems exhaust the products of
combustion to the exterior of the building and have been designed for ease of
assembly and safe operation and to achieve a high level of performance. SDV
produces and markets several hundred different venting products and systems.
 
In recent years, the abundant supply and clean burning characteristics of
natural gas have gained public recognition, resulting in increased market share
for gas appliances in the new construction and the appliance replacement
markets. In addition, concern over energy conservation and environmental air
quality has resulted in increased use of gas stoves and fireplaces rather than
the traditional wood burning stoves and fireplaces. As a result, new venting
systems, such as Direct-Vent, have been developed to address changes in
appliance technology.
 
Simpson Dura-Vent's objective is to expand market share in all of its
distribution channels, by entering expanding markets that address energy and
environmental concerns. SDV's strategy is to capitalize on its strengths in new
product development and its established distribution network and to continue its
commitment to superior quality and service. SDV operates manufacturing and
warehouse facilities in California and Mississippi.
 
Products
 
Simpson Dura-Vent is a leading supplier of double-wall Type B Gas Vent systems,
used for venting gas furnaces, water heaters, boilers and decorative gas
fireplaces. According to the Gas Appliance Manufacturers' Association ("GAMA"),
approximately 4.9 million gas water heaters and approximately 2.9 million gas
furnaces were sold in 1996. SDV believes that there is significant potential in
the gas fireplace market, because of the large number of
 
                                       27
<PAGE>   28
 
fireplaces sold in the new construction market, the relative ease of installing
side-wall vented gas fireplaces for the remodeling market and the trend from
wood to gas as a result of environmental concerns and ease of operation.
 
Simpson Dura-Vent's Type B Gas Vent product line features heavy-duty quality
construction and a twist-lock design that provides for fast and easy job-site
assembly compared to conventional snap together designs. The twist-lock design
has broader applications and has been incorporated into SDV's gas, pellet and
direct vent product lines.
 
Simpson Dura-Vent has introduced a patented flexible vent connector,
Dura/Connect, for use between the gas appliance flue outlet and the connection
to the Type B Gas Vent installed in the ceiling. Dura/Connect eliminates the
difficult and time consuming process of cutting, crimping and fitting galvanized
steel vent connectors. Marketed to home centers and hardware stores,
Dura/Connect offers a simple twist, bend and connect installation for water
heaters and gas furnaces.
 
   
The wood stove industry has responded to air quality concerns with substantial
reductions in wood stove particulate emissions. In 1985, Simpson Dura-Vent
introduced Dura-Plus, a patented chimney system for use with wood burning
stoves. The Dura-Plus chimney is used with Environmental Protection Agency
("EPA") approved wood stoves. The Dura-Plus safety valve design provides
enhanced fire safety in the event of a creosote chimney fire. The Dura-Plus
chimney is available in kits, and is sold through retail fireplace specialty
shops and home centers. The growing gas fireplace market has evolved into two
basic types of fireplace: top-vent fireplaces that are vented with the standard
Type B Gas Vent and direct-vent fireplaces that use a special double-wall
venting system. Since 1993, SDV has provided direct-vent gas fireplace venting
systems under OEM contracts with several major fireplace manufacturers in the
United States. SDV's direct-vent system is designed not only to exhaust the flue
products, but also to draw in outside air for combustion, an important feature
in modern energy-efficient home construction. The direct-vent gas fireplace
systems provide ease of installation, permitting horizontal through-the-wall
venting or standard vertical through-the-roof venting. Sales of Direct-Vent have
been robust. In 1996, SDV expanded its Direct-Vent product line to include both
co-axial and co-linear direct vent systems for venting gas stoves and gas
inserts into existing masonry chimneys or existing factory-built metal chimneys.
    
 
Since early 1995, nearly all wood stove manufacturers have introduced direct
vent gas stoves. Simpson Dura-Vent has entered into OEM and distribution
relationships with several of these manufacturers to supply Direct Vent venting
products. In 1994, SDV introduced Direct Vent G.S., a decorative direct vent
system for venting free standing gas stoves. The recent trend from wood to gas
stoves, while increasing competition for wood and pellet appliance venting
products, is viewed as a significant opportunity for SDV's gas venting products.
 
New Product Development
 
Simpson Dura-Vent has gained industry recognition by offering innovative new
products that meet changing needs of customers. SDV representatives serve on
industry committees concerned with issues such as new appliance standards and
government regulations. SDV also maintains working relationships with research
and development departments of major appliance manufacturers, providing
prototypes for field testing and conducting tests in SDV's testing laboratory.
SDV believes that such relationships provide competitive advantages. For
example, several years ago, SDV introduced the first special vent for the newly
invented pellet stoves, and more recently, SDV introduced the first direct vent
system for the increasingly popular direct vent gas appliances.
 
Sales and Marketing
 
Simpson Dura-Vent's sales organization consists of a director of sales and
marketing, a marketing communications manager, regional sales managers, and
independent representative agencies. SDV markets venting systems for both gas
and wood burning appliances through wholesale distributors in the United States,
Canada and Australia to the HVAC (heating, ventilating and air conditioning) and
PHC (plumbing, heating and cooling) contractor markets, and to fireplace
specialty shop distributors. These customers sell to contractor and DIY markets.
SDV also markets venting products to home center and hardware store chains. SDV
has entered into OEM relationships with several major gas fireplace and gas
stove manufacturers, which SDV believes are leaders in the direct-vent gas
appliance market.
 
                                       28
<PAGE>   29
 
Simpson Dura-Vent responds to technological changes occurring in the industry
through new product development and has developed a reputation for quality and
service to its customers. To reinforce the image of quality, SDV produces
extensive sales support literature and advertising materials. Recognizing the
difficulty that customers and users may have in understanding new, complex
venting requirements, SDV publishes a venting handbook to assist contractors,
building officials and retail outlets with the science of proper venting.
Advertising and promotional literature has been designed to be used by
distributors and their customers, as well as home centers and hardware chains.
 
MANUFACTURING PROCESS
 
The Company has concentrated on making its manufacturing processes as efficient
as possible without sacrificing the flexibility necessary to service the needs
of its customers.
 
The Company has developed and uses automated manufacturing processes. The
Company's innovative manufacturing systems and techniques have allowed it to
control manufacturing costs, even while developing both new products and
products that meet customized requirements and specifications. The Company's
development of specialized manufacturing processes also has permitted increased
operating flexibility and enhanced product design innovation.
 
The Company is committed to helping people build safer structures economically
through the design, engineering and manufacturing of structural connector and
related products. To this end, the Company has developed a quality management
system that employs numerous quality-control procedures, such as
computer-generated work orders, constant review of parts as they are produced
and frequent quality testing. Since 1996, Simpson Strong-Tie's quality
management system has been registered under ISO 9001, an internationally
recognized set of quality-assurance standards. The Company believes that ISO
registration is a significant asset in doing business with European companies
and is becoming increasingly important to U.S. companies.
 
Most of Simpson Strong-Tie's products are produced with a high level of
automation, using progressive dies run in automatic presses making parts from
coiled sheet steel often in excess of 100 strokes per minute. SST produces 500
million product pieces per year. Over half of SST's products are individually
bar coded, particularly the products which are sold to home centers. SST has
significant press capacity and has some multiple dies for its high volume
products because of the need to produce the product close to the customer and to
provide backup capacity. The balance of production is accomplished through a
combination of manual, blanking and numerically controlled (NC) processes which
include robotic welders, lasers and turret punches. SST believes it is the only
manufacturer in the connector industry using NC turret punches to manufacture a
large variety of standard and special products. This capability allows SST to
produce products with little redesign or set-up time, facilitating rapid
turnaround for customers. New tooling is also highly automated. Dies are
designed and produced using computer aided design (CAD) and computer aided
machinery (CAM) systems. CAD/CAM capability enables SST to create multiple dies
rapidly and design them to high standards. The Company is constantly reviewing
its product line to reduce manufacturing costs and increase automation.
 
Simpson Dura-Vent produces component parts for venting systems using
NC-controlled punch presses equipped with high-speed progressive and compound
tooling. SDV's vent pipe and elbow assembly lines are automated, to produce
finished products efficiently from large coils of steel and aluminum. UPC bar
coding and computer tracking systems provide SDV's industrial engineers and
production supervisors with real-time productivity tools to measure and evaluate
current production rates, methods and equipment.
 
REGULATION
 
Simpson Strong-Tie's product lines are subject to Federal, state, county,
municipal and other governmental and quasi-governmental regulations that affect
product design, development, testing, applications, marketing, sales,
installation and use. Most SST products are recognized by building code and
standards agencies. Agencies that recognize Company products include the
International Conference of Building Officials ("ICBO"), Building Officials and
Code Administrators International ("BOCA"), Southern Building Code Congress
International ("SBCCI"), The National Evaluation Service, the City of Los
Angeles, Dade County, Florida, and the California Division of
 
                                       29
<PAGE>   30
 
Architecture. These and other code agencies adopt various testing and design
standards and incorporate them into their related building codes. For example,
ICBO requirements are codified in the Uniform Building Code. The Uniform
Building Code generally applies to construction in the Western United States. To
be recognized by ICBO, SST products must conform to Uniform Building Code
requirements. SST considers this recognition to be a significant marketing tool
and devotes considerable effort to obtaining appropriate approvals for its
products. SST believes that architects, engineers, contractors and other
customers are less likely to purchase structural products that lack the
appropriate code approval or acceptance, at least if code-accepted competitive
products are available. SST's management actively participates in industry
related professional associations to keep abreast of regulatory changes and to
provide information to regulatory agencies.
 
Simpson Dura-Vent operates under a complex regulatory environment that includes
appliance and venting performance standards related to safety, energy efficiency
and air quality. Gas venting regulations are contained in the National Fuel Gas
Code ("NFGC"), while safety and performance regulations for wood burning
appliances and chimney systems are contained in a National Fire Protection
Association standard ("NFPA 211"). Standards for testing gas vents and chimneys
are developed by testing laboratories such as Underwriter's Laboratories ("UL")
in compliance with the American National Standards Institute. Clean air
standards for both gas and wood burning appliances are regulated by the EPA.
Energy efficiency standards are regulated by the Department of Energy ("DOE")
under the authority of the National Appliance Energy Conservation Act. See "Risk
Factors -- Regulatory Matters." The standards and regulations contained in the
NFGC and NFPA 211 are ultimately adopted by national building code organizations
such as ICBO, BOCA and SBCCI. In turn, the various building codes are adopted by
local municipalities, resulting in enforcement through the building permit
process. Safety, air quality and energy efficiency requirements are enforced by
local air quality districts and municipalities by requiring proper UL, EPA and
DOE labels on appliances and venting systems.
 
COMPETITION
 
The Company faces a variety of competition in all of the markets in which it
participates. This competition ranges from subsidiaries of large national or
international corporations to small regional manufacturers. While price is an
important factor, the Company competes primarily on the basis of quality,
breadth of product line, technical support, service, field support and product
innovation. Simpson Strong-Tie competes with numerous companies and its
competitors generally are privately held businesses. Most of the competitors
tend to be more regional than SST, but one distributes its products nationally.
 
The venting industry is highly competitive. Many of Simpson Dura-Vent's
competitors have greater financial and other resources than SDV. SDV's principal
competitors include the Selkirk Metalbestos Division of Eljer Industries Inc. (a
subsidiary of Zurn Industries), American Metal Products Co. (a subsidiary of
Masco Corp.), Metal-Fab, Inc., Hart & Cooley, Inc. and the Air Jet Division of
General Products Co. The Company believes that Metal-Fab, Inc., Hart & Cooley,
Inc. and Air Jet tend to be more regional than SDV, and that they have smaller
shares of the national market than SDV. See "Risk Factors -- Competition."
 
RAW MATERIALS
 
The principal raw material used by the Company is steel, including stainless
steel, and is generally ordered to specific American Society of Testing and
Materials ("ASTM") standards. Other raw materials include aluminum, aluminum
alloys and ceramic and other insulation materials, which are used by Simpson
Dura-Vent, and cartons, which are used by both SST and SDV. The Company
purchases raw materials from a variety of commercial sources. The Company's
practice is to seek cost savings and enhanced quality by purchasing from a
limited number of suppliers. See "Risk Factors -- Effect of Increased Raw
Materials Costs" and "Management's Discussion and Analysis of Financial
Condition and Results of Operations."
 
PATENTS AND PROPRIETARY RIGHTS
 
The Company's subsidiaries own more than 80 U.S. and foreign patents, of which
70 cover products that they currently manufacture and market. Its subsidiaries
have filed 14 U.S. and 25 foreign patent applications that are currently
pending. These patents and patent applications cover various design aspects of
the subsidiaries' products
 
                                       30
<PAGE>   31
 
as well as processes used in their manufacture. The Company's subsidiaries are
continuing to develop new potentially patentable products, product enhancements
and product designs. Although the Company's subsidiaries do not intend to apply
for additional foreign patents covering existing products, the Company is
developing an international patent program to protect new products that its
subsidiaries may develop. See "Risk Factors -- Dependence on Intellectual
Property Protection."
 
The Company's subsidiaries hold 99 trademark registrations in the U.S. and
foreign countries covering 48 trademarks, have 40 trademark registration
applications pending in the U.S. and foreign countries covering seven
trademarks, and use several other trademarks that they have not yet attempted to
register.
 
ACQUISITIONS AND STRATEGIC INVESTMENTS
 
The Company's future growth, if any, may depend to some extent on its ability to
penetrate new markets, both domestically and internationally. See
"Business -- Business Strategy" and "Business -- Industry and Market Trends."
Therefore, the Company may in the future pursue acquisitions of product lines or
businesses. See "Risk Factors -- Dependence on New Markets; Expansion Outside
the United States" and "Risk Factors -- Ability to Assimilate Acquisitions."
 
In 1996, the Company purchased for approximately $1.0 million the assets of the
Builders Products Division of MiTek Industries Ltd. ("MiTek") and entered into
an agreement to supply MiTek with connector products in the UK. In addition,
during the first quarter of 1997, the Company purchased three Canadian companies
and a related U.S. company, the Isometric Group, which manufacture and
distribute a line of mechanical anchors and related products, for approximately
$7.6 million plus an earnout based on future sales increases. Also during the
first quarter of 1997, the Company purchased, for approximately $1.7 million,
the remaining 66% equity in Patrick Bellion, S.A., a French manufacturer of
connector products. See "Management's Discussion and Analysis of Financial
Condition and Results of Operations -- Liquidity and Sources of Capital."
 
EMPLOYEES AND LABOR RELATIONS
 
As of December 31, 1997, the Company had 1,272 full-time employees, of whom 885
were hourly employees and 387 were salaried employees. The Company believes that
its overall compensation and benefits for the most part exceed industry averages
and that its relations with its employees are good.
 
A significant number of the Company's employees at two of the Company's major
manufacturing facilities are represented by labor unions and are covered by
collective bargaining agreements. Three of the Company's collective bargaining
agreements at two of its California facilities were renegotiated in 1995. These
agreements cover sheetmetal workers in Brea, California, and the Company's tool
and die craftsmen in both Brea and San Leandro, California. These three
contracts were extended into 1998 and 1999. A fourth contract, covering
sheetmetal workers in San Leandro, expires in July 2000.
 
The Company maintains several profit sharing, stock option and bonus plans to
provide incentives to its employees. The Company's cash profit sharing bonus
plan gives participating employees the opportunity to benefit from the Company's
operating profits above certain minimum levels established by the Board of
Directors. The Company's subsidiaries maintain defined contribution profit
sharing plans for their U.S.-based salaried employees and nonunion hourly
employees, and the Company contributes annually to these plans from 10% to 15%
of eligible earnings, as defined in the plans. The Company's 1994 Stock Option
Plan provides for the grant of options to employees, directors and consultants
of the Company and currently authorizes the grant of stock options to purchase
up to an aggregate of 1,500,000 shares of Common Stock; options to purchase an
aggregate of 970,417 shares were outstanding under this Option Plan as of
December 31, 1997. In addition, employees who have been employed by the Company
for more than ten years and who the Company determines are not eligible to
participate in the 1994 Stock Option Plan may be awarded stock and cash bonuses
under the Company's 1994 Employee Stock Bonus Plan, based on their years of
service with the Company.
 
                                       31
<PAGE>   32
 
PROPERTIES
 
The Company maintains its home office in Pleasanton, California, and other
offices, manufacturing and warehouse facilities elsewhere in California and in
Texas, Ohio, Florida, Mississippi, Illinois, British Columbia, Ontario, England
and France. As of December 31, 1997, the Company owned or leased office,
manufacturing and warehouse facilities occupying an aggregate of approximately
1,840,000 square feet. See Note 9 to the Consolidated Financial Statements.
 
The Company's manufacturing facilities are equipped with specialized equipment
and use extensive automation. The Company considers its existing and planned
facilities to be suitable and adequate for its operations as currently conducted
and as planned through 1998. The manufacturing facilities currently are being
operated with two shifts at most plants. The Company anticipates that it may
require additional facilities to accommodate its growth in later years.
 
LEGAL PROCEEDINGS
 
From time to time, the Company is involved in litigation that it considers to be
in the normal course of its business. No such litigation within the last five
years resulted in any material loss. The Company is not engaged in any legal
proceedings as of the date hereof, which the Company expects individually or in
the aggregate to have a material adverse effect on the Company's financial
condition or results of operations.
 
                                       32
<PAGE>   33
 
                                   MANAGEMENT
 
DIRECTORS AND EXECUTIVE OFFICERS OF THE COMPANY AND ITS SUBSIDIARIES
 
The name, age, and current position(s) of each director and executive officer of
the Company are as follows:
 
   
<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------
                                             PRESENT PRINCIPAL POSITION AND OFFICES WITH THE
                                                                 COMPANY
               NAME                  AGE                  AND ITS SUBSIDIARIES
- -----------------------------------  ----  ---------------------------------------------------
<S>                                  <C>   <C>
Barclay Simpson(1)(4)                  76  Chairman of the Board and Director of the Company,
                                           SST and SDV
Thomas J Fitzmyers                     57  President, Chief Executive Officer and Director of
                                           the Company and SST; Director of SDV
Stephen B. Lamson                      45  Chief Financial Officer, Treasurer, Secretary and
                                           Director of the Company, SST and SDV
Donald M. Townsend                     51  President, Chief Executive Officer and Director of
                                           SDV
Earl F. Cheit(2)(4)                    71  Director of the Company
Alan R. McKay(2)(4)                    72  Director of the Company
Sunne Wright McPeak(1)(3)(4)           49  Director of the Company
Barry Lawson Williams(1)(2)(3)(4)      53  Director of the Company
</TABLE>
    
 
- ---------------
 
(1) Member of the Compensation Committee
 
(2) Member of the Audit Committee
 
(3) Member of 1994 Stock Option Plan Committee
 
(4) Member of the Growth Committee
 
The Board of Directors has not established a nominating committee. The Board of
Directors currently comprises seven members. All directors hold office until the
next annual meeting of the shareholders or until their successors are elected.
 
BARCLAY SIMPSON has been the Chairman of the Board of Directors and a director
of the Company since 1956. Since 1982, Mr. Simpson and his wife have owned
Barclay Simpson Fine Arts Gallery, a commercial art gallery in Lafayette,
California. Mr. Simpson is also a member of the Boards of Directors of Civic
Bancorp, Calender Robinson Insurance, the University Art Museum of the
University of California at Berkeley, the California College of Arts and Crafts
and other charitable and educational institutions.
 
THOMAS J FITZMYERS has served as President and a director of the Company since
1978, as the President and a director of Simpson Strong-Tie since 1983 and as a
director of Simpson Dura-Vent since 1982. He was appointed as the Company's
Chief Executive Officer in 1994. Mr. Fitzmyers was employed by Union Bank from
1971 to 1978. He was a Regional Vice President when he left Union Bank to join
the Company in 1978.
 
STEPHEN B. LAMSON has served as the Company's, Simpson Strong-Tie's and Simpson
Dura-Vent's Chief Financial Officer and Treasurer since 1989, as the Company's
and SDV's Secretary since 1989, as SST's Secretary since 1992, as a director of
the Company since 1990, as a director of SST since 1992 and as a director of SDV
since 1989. From 1980 to 1989, Mr. Lamson was with Coopers & Lybrand. He was an
audit manager when he left that firm to join the Company in 1989.
 
EARL F. CHEIT has been a Senior Advisor to the Asia Foundation on Asia-Pacific
Economic Affairs since 1984 and became Dean Emeritus of the Haas School of
Business at the University of California, Berkeley, in 1992. He is currently a
director of The Shaklee Corporation and CNF Transportation, Inc. and a Trustee
of Mills College.
 
ALAN R. MCKAY has been the President of Alan R. McKay & Associates, an
engineering consulting firm based in Lafayette, California, since 1959. He is a
registered civil, structural and geotechnical engineer in the State of
California with extensive experience in connector applications.
 
SUNNE WRIGHT MCPEAK is the President and Chief Executive Officer of the Bay Area
Council, a business sponsored organization founded in 1945 that promotes
economic activity and environmental quality in the region.
 
                                       33
<PAGE>   34
 
Prior to this position, she was the President and Chief Executive Officer of the
Bay Area Economic Forum, a partnership of government, business, academic and
foundation sectors of the nine San Francisco Bay Area counties. From 1979
through 1994, she served on the Board of Supervisors of Contra Costa County,
California, including several terms as Chair. Her most recent term as Chair
concluded in 1992. In addition, Ms. McPeak served as President of the California
State Association of Counties and has been a member of the advisory boards of
the Urban Land Institute and California State University, Hayward. She is
currently a director of the California Foundation for the Environment and the
Economy.
 
BARRY LAWSON WILLIAMS has been President of Williams Pacific Ventures Inc., a
venture capital and real estate consulting firm, since 1987. From 1989 until its
sale in 1992, he was also Chief Executive Officer and owner of C.N. Flagg Power
Inc. He is a director of PG&E Corporation, CH2M HILL Companies, Ltd., The U.S.A.
Group, Inc., Newhall Land and Farming Co. Inc., Northwestern Mutual Life
Insurance Co. and CompUSA, Inc.
 
DONALD M. TOWNSEND has been employed by the Company since 1981 and has served as
a director of Simpson Dura-Vent since 1984 and as its President and Chief
Operating Officer since 1991. He was appointed as SDV's Chief Executive Officer
in 1994. From 1984 to 1991, he was the Vice President and General Manager of
SDV.
 
                                       34
<PAGE>   35
 
                       PRINCIPAL AND SELLING SHAREHOLDERS
 
The following table sets forth certain information, as of December 31, 1997, and
as adjusted to reflect the sale of shares offered hereby, with respect to the
beneficial ownership of the Company's Common Stock by (1) each Selling
Shareholder and each shareholder known by the Company to be the beneficial owner
of more than 5% of the Company's Common Stock, (2) each director of the Company,
(3) each person currently serving as an executive officer of the Company, and
(4) all current executive officers and directors of the Company as a group.
- --------------------------------------------------------------------------------
 
   
<TABLE>
<CAPTION>
                                                               SHARES BENEFICIALLY OWNED
                                                     ---------------------------------------------
                                                                              NUMBER OF
                                                                   PERCENT    SHARES TO
                                                                   PRIOR         BE         PERCENT
              NAME AND, FOR EACH 5%                  PRIOR TO        TO        SOLD IN      AFTER
            BENEFICIAL OWNER, ADDRESS                OFFERING(1)   OFFERING   OFFERING      OFFERING
- -------------------------------------------------    ---------     ------     ---------     ------
<S>                                                  <C>           <C>        <C>           <C>
Barclay Simpson(2)                                   3,700,872       32.1%           --       32.1%
  4637 Chabot Drive, Suite 200
  Pleasanton, CA 94588
Simpson PSB Fund                                     1,400,000       12.2%    1,387,500(3)       *
  3669 Mount Diablo Blvd.
  Lafayette, CA 94549
Thomas J Fitzmyers(4)                                  783,242        6.7%       50,000        6.3%
  4637 Chabot Drive, Suite 200
  Pleasanton, CA 94588
Scudder Kemper Investments, Inc.(5)                    695,100        6.0%           --        6.0%
  Two International Place
  Boston, MA 02110-4103
Royce & Associates, Inc. and
  Royce Management Company(6)                          641,800        5.6%           --        5.6%
  1414 Avenue of the Americas
  New York, NY 10019
Stephen B. Lamson(7)                                   251,000        2.2%           --        2.2%
Donald M. Townsend(8)                                  118,947        1.0%           --        1.0%
Alan R. McKay(9)                                         4,500          *            --          *
Earl F. Cheit(9)                                         2,500          *            --          *
Sunne Wright McPeak(9)                                   2,500          *            --          *
Barry Lawson Williams(10)                                  500          *            --          *
All current executive officers and directors as a
  group(11)                                          4,564,061       38.5%       50,000       38.2%
</TABLE>
    
 
- ---------------
 
* Less than one percent
 
(1) The information in this table is based on information supplied by the
Selling Shareholders and officers and directors, and, with respect to other
principal shareholders, statements on Schedule 13D or 13G filed with the
Securities and Exchange Commission. Unless otherwise indicated below, the
persons named in the table had sole voting and sole investment power with
respect to all shares beneficially owned, subject to community property laws
where applicable.
 
(2) Includes 150,000 shares owned by the Company's profit sharing trusts, of
which Messrs. Simpson, Fitzmyers and Lamson are the trustees and share voting
and dispositive power, as to which shares such trustees disclaim beneficial
ownership except to the extent of their participation as beneficiaries of one of
such trusts. Includes 500 shares subject to options granted under the 1994 Stock
Option Plan that are exercisable within 60 days.
 
   
(3) The Underwriters exercised their overallotment option. See "Underwriting."
    
 
(4) Includes 211,610 shares subject to options granted under the 1994 Stock
Option Plan that are exercisable within 60 days. Includes 150,000 shares owned
by the Company's profit sharing trusts, of which Messrs. Simpson, Fitzmyers and
Lamson are the trustees and share voting and dispositive power, as to which
shares such trustees disclaim beneficial ownership except to the extent of their
participation as beneficiaries of one of such trusts.
 
   
(5) Based on filings by Scudder Kemper Investments, Inc. ("Scudder") with the
Commission under section 13(d) of the Exchange Act. Scudder beneficially owned
695,100 shares of the Company's Common Stock. Scudder also
    
 
                                       35
<PAGE>   36
 
   
reported that it had investment power with respect to all 695,100 shares, sole
power to vote or to direct the vote of 217,900 shares and shared power to vote
or direct the vote of 323,200 shares.
    
 
   
(6) Based on filings by Royce & Associates, Inc. ("RAI"), Royce Management
Company ("RMC") and Charles M. Royce with the Commission under section 13(d) of
the Exchange Act, RAI and RMC beneficially owned an aggregate of 641,800 shares,
of which RAI had sole power to vote or direct the vote and to dispose or direct
the disposition of 611,800 shares and RMC had sole power to vote or direct the
vote and to dispose or direct the disposition of 30,000 shares. Those filings
also state that Charles M. Royce may be deemed to be a controlling person of RAI
and RMC. Mr. Royce disclaimed beneficial ownership of the shares beneficially
owned by RAI and RMC.
    
 
   
(7) Includes 54,548 shares subject to options granted under the 1994 Stock
Option Plan that are exercisable within 60 days. Includes 150,000 shares owned
by the Company's profit sharing trusts, of which Messrs. Simpson, Fitzmyers and
Lamson are the trustees and share voting and dispositive power, as to which
shares such trustees disclaim beneficial ownership except to the extent of their
participation as beneficiaries of one of such trusts.
    
 
   
(8) Includes 51,169 shares subject to options granted under the 1994 Stock
Option Plan that are exercisable within 60 days.
    
 
   
(9) Includes 2,500 shares subject to options granted under the Company's 1995
Independent Director Stock Option Plan that are exercisable within 60 days.
    
 
   
(10) Includes 500 shares subject to options granted under the Company's 1995
Independent Director Stock Option Plan that are exercisable within 60 days.
    
 
   
(11) Includes 325,827 shares subject to options exercisable within 60 days,
including the options described in the above notes, and 150,000 shares owned by
the Company's profit sharing trusts as described in notes 3, 4 and 6 above.
    
 
   
Of the shares offered hereby, 1,387,500 shares are being offered by Simpson PSB
Fund, a California nonprofit public benefit corporation, which is the Principal
Selling Shareholder. The Board of Directors of the Principal Selling Shareholder
comprises Charles A. Lee and Jules F. Bonjour, Jr. The Principal Selling
Shareholder is qualified as an organization exempt from federal and California
income taxation under section 501(c)(3) of the Internal Revenue Code of 1986, as
amended. In September 1997, Barclay Simpson donated 1,400,000 shares of Common
Stock to the Principal Selling Shareholder.
    
 
                                       36
<PAGE>   37
 
                          DESCRIPTION OF CAPITAL STOCK
 
The total number of shares of capital stock that the Company is authorized to
issue is 25,000,000 shares, consisting of 20,000,000 shares of Common Stock
without par value, of which 11,517,113 shares were issued and outstanding as of
December 31, 1997, and 5,000,000 shares of Preferred Stock without par value,
none of which is outstanding. The Company had approximately 248 shareholders of
record as of that date.
 
COMMON STOCK
 
Subject to the rights of holders of any Preferred Stock that may be issued in
the future, holders of Common Stock are entitled to receive such dividends, if
any, as may be declared from time to time by the Board of Directors out of funds
legally available therefor (see "Dividend Policy") and in the event of
liquidation, dissolution or winding-up of the Company, to share ratably in all
assets available for distribution. The holders of Common Stock have no
preemptive or conversion rights. Subject to the rights of holders of any
Preferred Stock that may be issued in the future, the holders of Common Stock
are entitled to one vote per share on any matter submitted to a vote of the
shareholders, except that, on giving notice as required by law and subject to
compliance with other statutory conditions, shareholders may cumulate their
votes in an election of directors, and each shareholder may give one candidate a
number of votes equal to the number of directors to be elected multiplied by the
number of shares held by such shareholder or may distribute such shareholder's
votes on the same principle among as many candidates as such shareholder thinks
fit. All shares of Common Stock offered hereby are outstanding and fully paid
and are not subject to further calls or assessments by the Company. There are no
redemption or sinking fund provisions applicable to the Common Stock.
 
PREFERRED STOCK
 
The Board of Directors has the authority to issue the authorized and unissued
Preferred Stock in one or more series with such designations, rights and
preferences as may be determined from time to time by the Board of Directors.
Accordingly, the Board of Directors is empowered, without shareholder approval,
to issue Preferred Stock with dividend, liquidation, conversion, voting or other
rights that could adversely affect the voting power or other rights of the
holders of the Company's Common Stock. In the event of issuance, the Preferred
Stock could be used under certain circumstances, as a method of discouraging,
delaying or preventing an acquisition or change in control of the Company. The
Company does not currently have any plan to issue any shares of its Preferred
Stock.
 
LIMITATIONS ON DIRECTORS' LIABILITIES AND INDEMNIFICATION
 
As authorized by the California General Corporation Law ("GCL"), the Company's
Articles of Incorporation include provisions limiting the liability of directors
of the Company for monetary damages. The effect of these provisions is to
eliminate the rights of the Company and its shareholders (through shareholders'
derivative suits on behalf of the Company) to recover monetary damages against a
director for breach of the fiduciary duty of care as a director (including
breaches resulting from negligence) except in certain limited situations. This
provision does not limit or eliminate the rights of the Company or any
shareholder to seek nonmonetary relief such as an injunction or rescission in
the event of a breach of a director's duty of care. The Company's Bylaws require
that the Company indemnify its directors and officers, and any employee who
serves as a director or officer of any corporation at the Company's request, to
the fullest extent permitted under and in accordance with the GCL. The Company
has entered into agreements to indemnify the directors and officers of the
Company, Simpson Strong-Tie and Simpson Dura-Vent, in addition to
indemnification provided in the Company's and its subsidiaries' Bylaws. These
agreements, among other things, require that the Company indemnify the directors
and officers for certain expenses, including attorneys' fees, judgments, fines
and settlement amounts incurred by any such person in any action or proceeding
or any threatened action or proceeding, whether civil or criminal, arising out
of such person's actions as a director or officer of the Company or any of its
subsidiaries or as a trustee of a Company profit-sharing plan. The Company
believes that these provisions and agreements will assist the Company in
attracting and retaining qualified individuals to serve as directors and
officers.
 
TRANSFER AGENT AND REGISTRAR
 
The transfer agent and registrar for the Common Stock is BankBoston, N.A., c/o
Boston EquiServe, L.P.
 
                                       37
<PAGE>   38
 
                                  UNDERWRITING
 
   
Under the terms and subject to the conditions of an Underwriting Agreement dated
February 24, 1998 (the "Underwriting Agreement"), the Selling Shareholders have
agreed to sell to the Underwriters named below, and each of such Underwriters,
for whom J.P. Morgan Securities Inc., Merrill Lynch, Pierce, Fenner & Smith
Incorporated and BancAmerica Robertson Stephens are acting as representatives,
has severally agreed to purchase from the Selling Shareholders, the respective
number of shares of Common Stock set forth opposite its name below:
    
 
   
<TABLE>
<CAPTION>
                                                                        ---------
                                                                         NUMBER
                                   UNDERWRITERS                         OF SHARES
                                                                        ---------
            <S>                                                         <C>
            J.P. Morgan Securities Inc.                                   483,000
            Merrill Lynch, Pierce, Fenner & Smith                         483,000
                        Incorporated
            BancAmerica Robertson Stephens                                241,500
            CIBC Oppenheimer Corp.                                         46,000
            Donaldson, Lufkin & Jenrette Securities Corporation            46,000
            Morgan Stanley & Co. Incorporated                              46,000
            Charles Schwab & Co., Inc.                                     46,000
            Hoefer & Arnett Inc.                                           46,000
                                                                        ---------
                      Total                                             1,437,500
                                                                        =========
</TABLE>
    
 
The Underwriting Agreement provides that the obligations of the several
Underwriters to purchase shares of Common Stock are subject to the approval of
certain legal matters by counsel and certain other conditions. Under the terms
and conditions of the Underwriting Agreement, the Underwriters are obligated to
take and pay for all such shares, if any are taken.
 
   
The Underwriters propose initially to offer the shares of Common Stock directly
to the public at the price set forth on the cover page of this Prospectus and to
certain dealers at such price less a concession not in excess of $1.14 per
share. The Underwriters may allow, and such dealers may reallow, a concession
not in excess of $0.10 per share to certain other dealers. After the initial
public offering of the Common Stock, the public offering price and such
concession may be changed.
    
 
   
The Principal Selling Shareholder granted to the Underwriters an option,
expiring at the close of business on the 30th day after the date of this
Prospectus, to purchase up to an additional 187,500 shares of Common Stock from
the Principal Selling Shareholder, at the initial public offering price, less
the underwriting discount. The Underwriters exercised such option in full for
the purpose of covering overallotments.
    
 
The Company and each of the Selling Shareholders have agreed to indemnify the
Underwriters against certain liabilities, including liabilities under the
Securities Act.
 
The Company and certain of its shareholders, including the Selling Shareholders,
have agreed that they will not, without the prior written consent of J.P. Morgan
Securities Inc., issue, sell, offer, agree to sell or otherwise dispose of,
directly or indirectly, any shares of Common Stock, any options, rights or
warrants to purchase Common Stock or any securities convertible into or
exchangeable or exercisable for Common Stock until the 90th day after the date
of this Prospectus, except for stock options issued under the 1994 Stock Option
Plan or the 1995 Independent Director Stock Option Plan, and issuances of shares
of Common Stock pursuant to the exercise of stock options
 
                                       38
<PAGE>   39
 
granted under the 1994 Stock Option Plan or the 1995 Independent Director Stock
Option Plan or pursuant to the Company's 1994 Employee Stock Bonus Plan. J.P.
Morgan Securities Inc. may in its exclusive discretion and at any time without
notice, release all or a portion of the securities subject to these
restrictions.
 
In connection with the offering, the Underwriters may engage in transactions
that stabilize, maintain or otherwise affect the price of the Common Stock.
Specifically, the Underwriters may overallot the offering, creating a syndicate
short position. In addition, the Underwriters may bid for, and purchase, shares
of Common Stock in the open market to cover syndicate shorts or to stabilize the
price of the Common Stock. Finally, the underwriting syndicate may reclaim
selling concessions allowed for distributing the Common Stock in the offering,
if the syndicate repurchases previously distributed Common Stock in syndicate
covering transactions, in stabilizing transactions or otherwise. Any of these
activities may stabilize or maintain the market price of the Common Stock above
independent market levels. The Underwriters are not required to engage in these
activities, and may end any of these activities at any time.
 
                                 LEGAL MATTERS
 
The validity of the shares of Common Stock offered by the Selling Shareholders
hereby will be passed on for the Selling Shareholders by Shartsis, Friese &
Ginsburg LLP, San Francisco, California. Partners and associates of Shartsis,
Friese & Ginsburg LLP and members of their immediate families own an aggregate
of 6,041 shares of Common Stock. Certain legal matters will be passed on for the
Underwriters by Cahill Gordon & Reindel (a partnership including a professional
corporation), New York, New York.
 
                                    EXPERTS
 
The consolidated balance sheets as of December 31, 1996 and 1997, and the
consolidated statements of operations, shareholders' equity and cash flows for
each of the three years in the period ended December 31, 1997, included in this
Prospectus, have been audited by Coopers & Lybrand L.L.P., independent
accountants. These consolidated financial statements audited by Coopers &
Lybrand L.L.P. have been included herein in reliance on the reports given on the
authority of that firm as experts in accounting and auditing.
 
                                       39
<PAGE>   40
 
                        SIMPSON MANUFACTURING CO., INC.
 
                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                                                        PAGE
<S>                                                                                     <C>
Financial Statements
 
  Report of Independent Accountants                                                     F-2
 
  Consolidated Balance Sheets at December 31, 1996 and 1997                             F-3
 
  Consolidated Statements of Operations for the years ended December 31, 1995, 1996
     and 1997                                                                           F-4
 
  Consolidated Statements of Shareholders' Equity for the years ended December 31,
     1995, 1996 and 1997                                                                F-5
 
  Consolidated Statements of Cash Flows for the years ended December 31, 1995, 1996
     and 1997                                                                           F-6
 
  Notes to the Consolidated Financial Statements                                        F-7
</TABLE>
 
                                       F-1
<PAGE>   41
 
                       REPORT OF INDEPENDENT ACCOUNTANTS
 
To the Board of Directors and Shareholders of Simpson Manufacturing Co., Inc.:
 
We have audited the consolidated balance sheets of Simpson Manufacturing Co.,
Inc. as of December 31, 1996 and 1997, and the consolidated statements of
operations, shareholders' equity and cash flows for each of the three years in
the period ended December 31, 1997. These financial statements are the
responsibility of the Company's management. Our responsibility is to express an
opinion on these financial statements based on our audits.
 
We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatements. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
In our opinion, the financial statements referred to above present fairly, in
all material respects, the consolidated financial position of Simpson
Manufacturing Co., Inc. and subsidiaries as of December 31, 1996 and 1997, and
the consolidated results of their operations and their cash flows for each of
the three years in the period ended December 31, 1997, in conformity with
generally accepted accounting principles.
 
                                          COOPERS & LYBRAND L.L.P.
 
San Francisco, California
January 29, 1998
 
                                       F-2
<PAGE>   42
 
                SIMPSON MANUFACTURING CO., INC. AND SUBSIDIARIES
 
                          CONSOLIDATED BALANCE SHEETS
 
<TABLE>
<CAPTION>
                                                                  -----------------------------
                                                                          DECEMBER 31,
                                                                      1996             1997
                                                                  ------------     ------------
<S>                                                               <C>              <C>
                                            ASSETS
Current assets
  Cash and cash equivalents                                       $ 19,815,297     $ 19,418,689
  Short-term investments                                             3,896,428               --
  Trade accounts receivable, net                                    20,930,490       24,625,568
  Inventories                                                       42,247,777       54,982,945
  Deferred income taxes                                              2,919,455        3,536,750
  Other current assets                                                 956,565        1,723,586
                                                                  ------------     ------------
     Total current assets                                           90,766,012      104,287,538
Property, plant and equipment, net                                  28,687,635       42,925,088
Investments                                                          1,382,578          559,200
Other noncurrent assets                                              1,684,548        2,993,114
                                                                  ------------     ------------
          Total assets                                            $122,520,773     $150,764,940
                                                                   ===========      ===========
                             LIABILITIES AND SHAREHOLDERS' EQUITY
Current liabilities
  Notes payable                                                   $         --     $     29,605
  Trade accounts payable                                            10,063,828        8,813,196
  Accrued liabilities                                                4,137,648        5,506,903
  Accrued profit sharing trust contributions                         2,446,001        2,886,875
  Accrued cash profit sharing and commissions                        2,292,057        3,094,834
  Accrued workers' compensation                                        809,272          659,272
  Income taxes payable                                                 341,626               --
                                                                  ------------     ------------
     Total current liabilities                                      20,090,432       20,990,685
Long-term liabilities                                                  133,333          823,732
                                                                  ------------     ------------
          Total liabilities                                         20,223,765       21,814,417
                                                                  ------------     ------------
Commitments and contingencies (Note 9)
Shareholders' equity
  Preferred Stock, without par value; authorized shares,
     5,000,000; issued and outstanding shares, none                         --               --
  Common Stock, without par value; authorized shares,
     20,000,000; issued and outstanding shares, 11,451,018, and
     11,517,113 at December 31, 1996 and 1997                       31,233,648       32,377,563
  Retained earnings                                                 70,862,906       96,848,685
  Cumulative translation adjustment                                    200,454         (275,725)
                                                                  ------------     ------------
     Total shareholders' equity                                    102,297,008      128,950,523
                                                                  ------------     ------------
          Total liabilities and shareholders' equity              $122,520,773     $150,764,940
                                                                   ===========      ===========
</TABLE>
 
  The accompanying notes are an integral part of these consolidated financial
                                  statements.
 
                                       F-3
<PAGE>   43
 
                SIMPSON MANUFACTURING CO., INC. AND SUBSIDIARIES
 
                     CONSOLIDATED STATEMENTS OF OPERATIONS
 
<TABLE>
<CAPTION>
                                                   ----------------------------------------------
                                                              YEARS ENDED DECEMBER 31,
                                                       1995             1996             1997
                                                   ------------     ------------     ------------
<S>                                                <C>              <C>              <C>
Net sales                                          $167,957,955     $202,408,917     $246,074,446
Cost of sales                                       109,368,027      124,394,086      149,279,718
                                                   ------------     ------------     ------------
     Gross profit                                    58,589,928       78,014,831       96,794,728
                                                   ------------     ------------     ------------
Operating expenses
  Selling                                            17,109,325       20,104,344       23,113,344
  General and administrative                         18,512,003       25,035,874       30,052,669
  Compensation related to stock plans (Note 13)          61,250          180,155          305,038
                                                   ------------     ------------     ------------
                                                     35,682,578       45,320,373       53,471,051
                                                   ------------     ------------     ------------
     Income from operations                          22,907,350       32,694,458       43,323,677
Interest income, net                                    141,535          595,180          429,102
                                                   ------------     ------------     ------------
     Income before income taxes                      23,048,885       33,289,638       43,752,779
Provision for income taxes                            8,927,000       13,569,000       17,767,000
                                                   ------------     ------------     ------------
          Net income                               $ 14,121,885     $ 19,720,638     $ 25,985,779
                                                   ============     ============     ============
Net income per common share
  Basic                                            $       1.25     $       1.73     $       2.26
  Diluted                                          $       1.23     $       1.68     $       2.17
Number of shares outstanding
  Basic                                              11,316,673       11,424,945       11,474,592
  Diluted                                            11,460,567       11,755,184       11,965,950
</TABLE>
 
  The accompanying notes are an integral part of these consolidated financial
                                  statements.
 
                                       F-4
<PAGE>   44
 
                SIMPSON MANUFACTURING CO., INC. AND SUBSIDIARIES
 
                CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY
 
              FOR THE YEARS ENDED DECEMBER 31, 1995, 1996 AND 1997
 
<TABLE>
<CAPTION>
                                   ------------------------------------------------------------------
                                         COMMON STOCK                       CUMULATIVE
                                   ------------------------    RETAINED     TRANSLATION
                                     SHARES       AMOUNT       EARNINGS     ADJUSTMENT      TOTAL
                                   ----------   -----------   -----------   ----------   ------------
<S>                                <C>          <C>           <C>           <C>          <C>
Balance, January 1, 1995           11,275,196   $29,580,365   $37,020,383   $ (78,715)   $ 66,522,033
  Options exercised                    82,231       749,156            --          --         749,156
  Tax benefit of options
     exercised                             --        78,395            --          --          78,395
  Common stock issued at $9.75
     per share                            800         7,800            --          --           7,800
  Translation adjustment                   --            --            --      73,421          73,421
  Net income                               --            --    14,121,885          --      14,121,885
                                   ----------   -----------   -----------   ---------    ------------
Balance, December 31, 1995         11,358,227    30,415,716    51,142,268      (5,294)     81,552,690
  Options exercised                    90,191       526,415            --          --         526,415
  Tax benefit of options
     exercised                             --       256,417            --          --         256,417
  Common stock issued at $13.50
     per share                          2,600        35,100            --          --          35,100
  Translation adjustment                   --            --            --     205,748         205,748
  Net income                               --            --    19,720,638          --      19,720,638
                                   ----------   -----------   -----------   ---------    ------------
Balance, December 31, 1996         11,451,018    31,233,648    70,862,906     200,454     102,297,008
  Options exercised                    61,595       451,282            --          --         451,282
  Tax benefit of options
     exercised                             --       589,133            --          --         589,133
  Common stock issued at $23.00
     per share                          4,500       103,500            --          --         103,500
  Translation adjustment                   --            --            --    (476,179)       (476,179)
  Net income                               --            --    25,985,779          --      25,985,779
                                   ----------   -----------   -----------   ---------    ------------
Balance, December 31, 1997         11,517,113   $32,377,563   $96,848,685   $(275,725)   $128,950,523
                                   ==========   ===========   ===========   =========    ============
</TABLE>
 
  The accompanying notes are an integral part of these consolidated financial
                                  statements.
 
                                       F-5
<PAGE>   45
 
                SIMPSON MANUFACTURING CO., INC. AND SUBSIDIARIES
 
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
 
<TABLE>
<CAPTION>
                                                     --------------------------------------------
                                                               YEARS ENDED DECEMBER 31,
                                                         1995            1996            1997
                                                     ------------     -----------     -----------
<S>                                                  <C>              <C>             <C>
CASH FLOWS FROM OPERATING ACTIVITIES
  Net income                                         $ 14,121,885     $19,720,638     $25,985,779
                                                     ------------     -----------     -----------
  Adjustments to reconcile net income to net cash
     provided by operating activities:
       Loss (gain) on sale of capital equipment            11,558         (16,262)        (11,194)
     Depreciation and amortization                      5,291,466       7,197,718       6,712,157
     Deferred income taxes and other long-term
       liabilities                                         65,000        (212,450)       (946,542)
     Equity in income of affiliates                       (24,554)       (107,000)       (142,500)
     Noncash compensation related to stock plans           61,250          35,100         103,500
     Changes in operating assets and liabilities,
       net of effects of acquisitions:
       Trade accounts receivable, net                  (2,916,665)       (190,608)     (2,277,797)
       Inventories                                     (2,655,355)     (7,500,960)     (6,867,089)
       Other current assets                              (951,314)        278,047        (700,537)
       Other noncurrent assets                           (256,380)       (800,840)        (14,450)
       Trade accounts payable                             665,976       2,688,814      (2,429,650)
       Accrued liabilities                                307,968         751,120         379,910
       Accrued profit sharing trust contributions         279,135         446,262         440,874
       Accrued cash profit sharing and commissions        (45,982)      1,002,913         802,777
       Accrued workers' compensation                      (55,000)        (32,853)       (150,000)
       Income taxes payable                              (500,661)      1,349,876         247,507
                                                     ------------     -----------     -----------
          Total adjustments                              (723,558)      4,888,877      (4,853,034)
                                                     ------------     -----------     -----------
               Net cash provided by operating
                 activities                            13,398,327      24,609,515      21,132,745
                                                     ------------     -----------     -----------
CASH FLOWS FROM INVESTING ACTIVITIES
  Capital expenditures                                (10,049,629)     (7,364,326)    (16,548,350)
  Proceeds from sale of equipment                          22,225          57,787          65,327
  Asset acquisitions, net of cash acquired and
     equity interest already owned                     (2,414,114)     (1,041,780)     (9,336,142)
  Purchase of short-term investment                            --      (3,896,428)             --
  Proceeds from sale of short-term investments                 --              --       3,995,333
  Equity investments                                     (667,002)        (11,637)             --
                                                     ------------     -----------     -----------
               Net cash used in investing
                 activities                           (13,108,520)    (12,256,384)    (21,823,832)
                                                     ------------     -----------     -----------
CASH FLOWS FROM FINANCING ACTIVITIES
  Issuance of debt                                         20,037              --              --
  Repayment of debt                                            --         (20,037)       (260,304)
  Issuance of Company's common stock                      835,351         526,415         554,783
                                                     ------------     -----------     -----------
               Net cash provided by financing
                 activities                               855,388         506,378         294,479
                                                     ------------     -----------     -----------
                    Net increase (decrease) in cash
                      and cash equivalents              1,145,195      12,859,509        (396,608)
Cash and cash equivalents at beginning of period        5,810,593       6,955,788      19,815,297
                                                     ------------     -----------     -----------
Cash and cash equivalents at end of period           $  6,955,788     $19,815,297     $19,418,689
                                                     ============     ===========     ===========
                        SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
CASH PAID DURING THE YEAR FOR
  Interest                                           $     35,045     $    31,311     $    80,071
                                                     ============     ===========     ===========
  Income taxes                                       $  8,961,714     $13,036,713     $19,564,663
                                                     ============     ===========     ===========
</TABLE>
 
  The accompanying notes are an integral part of these consolidated financial
                                  statements.
 
                                       F-6
<PAGE>   46
 
                SIMPSON MANUFACTURING CO., INC. AND SUBSIDIARIES
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
1.  OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
Nature of Operations
 
Simpson Manufacturing Co., Inc., through its subsidiaries Simpson Strong-Tie
Company Inc. and Simpson Dura-Vent Company, Inc. and its other subsidiaries
(collectively, the "Company"), designs, engineers and manufactures wood-to-wood,
wood-to-concrete and wood-to-masonry connectors and venting systems for gas and
wood burning appliances and markets its products to the residential
construction, light industrial and commercial construction, remodeling and
do-it-yourself markets.
 
The Company operates exclusively in the building products industry segment. The
Company's products are sold primarily throughout the United States of America.
Revenues have some geographic market concentration on the west coast. A portion
of the Company's business is therefore dependent upon economic activity within
this region and market.
 
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 assets and liabilities at the date of the financial statements and
the reported amounts of revenues and expenses during the reporting period.
Actual results could differ from those estimates.
 
Principles of Consolidation
 
The consolidated financial statements include the accounts of Simpson
Manufacturing Co., Inc. and its subsidiaries. Investments in less than 50%-owned
affiliates are accounted for using the equity method. All significant
intercompany transactions have been eliminated.
 
Cash Equivalents
 
The Company considers all highly liquid investments with an original maturity of
three months or less to be cash equivalents.
 
Short-term Investments
 
The Company considers investments with an original maturity of more than three
months but less than one year to be short-term investments, which are
categorized as "held-to-maturity" and carried at amortized cost, which
approximates market value.
 
Inventory Valuation
 
Inventories are valued at the lower of cost or market, with cost determined
under the last-in, first-out (LIFO) method, except in Europe and Canada, where
inventories of approximately $1,483,000 and $4,782,000 at December 31, 1996 and
1997, respectively, are valued using the first-in, first-out (FIFO) method.
 
Property, Plant and Equipment
 
Property, plant and equipment is carried at cost. Major renewals and betterments
are capitalized; maintenance and repairs are expensed on a current basis. When
assets are sold or retired, their costs and accumulated depreciation are removed
from the accounts; the resulting gains or losses are reflected in the
consolidated statements of operations.
 
                                       F-7
<PAGE>   47
 
                SIMPSON MANUFACTURING CO., INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
Depreciation and Amortization
 
Depreciation of property, plant and equipment is provided for using accelerated
methods over the following estimated useful lives:
 
<TABLE>
        <S>                                                             <C>
        Factory machinery and equipment                                 5 to 10 years
        Automobiles, trucks and other equipment                         3 to 10 years
        Office equipment                                                3 to 8 years
        Buildings and site improvements                                 20 to 45 years
</TABLE>
 
Leasehold improvements are amortized using the straight-line method over the
remaining term of the lease.
 
Product Research and Development Costs
 
Product research and development costs, which are included in cost of sales,
were charged against income as incurred and approximated $1,180,000, $1,312,000
and $1,280,000 in 1995, 1996 and 1997, respectively.
 
Tooling Costs
 
Tool and die costs are included in product costs in the year incurred.
 
Income Taxes
 
Income taxes are calculated using an asset and liability approach. The provision
for income taxes includes federal and state taxes currently payable and deferred
taxes, due to temporary differences between the financial statement and tax
bases of assets and liabilities. In addition, the future tax benefits are
recognized to the extent that realization of such benefits is more likely than
not.
 
Foreign Currency Translation
 
The local currency is the functional currency of the Company's operating
branches in Europe and Canada. Assets and liabilities denominated in foreign
currencies are translated using the exchange rate on the balance sheet date.
Revenues and expenses are translated using average exchange rates prevailing
during the year. The translation adjustment resulting from this process is shown
separately as a component of shareholders' equity. Foreign currency transaction
gains or losses are included in the determination of net income.
 
Common Stock
 
Subject to the rights of holders of any Preferred Stock that may be issued in
the future, holders of Common Stock are entitled to receive such dividends, if
any, as may be declared from time to time by the Board of Directors (the
"Board") out of funds legally available therefor and in the event of
liquidation, dissolution or winding-up of the Company, to share ratably in all
assets available for distribution. The holders of Common Stock have no
preemptive or conversion rights. Subject to the rights of any Preferred Stock
that may be issued in the future, the holders of Common Stock are entitled to
one vote per share on any matter submitted to a vote of the shareholders, except
that, on giving notice as required by law and subject to compliance with other
statutory conditions, shareholders may cumulate their votes in an election of
directors, and each shareholder may give one candidate a number of votes equal
to the number of directors to be elected multiplied by the number of shares held
by such shareholder or may distribute such shareholder's votes on the same
principle among as many candidates as such shareholder thinks fit. There are no
redemption or sinking fund provisions applicable to the Common Stock.
 
Preferred Stock
 
The Board has the authority to issue the authorized and unissued Preferred Stock
in one or more series with such designations, rights and preferences as may be
determined from time to time by the Board. Accordingly, the Board
 
                                       F-8
<PAGE>   48
 
                SIMPSON MANUFACTURING CO., INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
is empowered, without shareholder approval, to issue Preferred Stock with
dividend, liquidation, conversion, voting or other rights that could adversely
affect the voting power or other rights of the holders of the Company's Common
Stock.
 
Net Income per Common Share
 
Basic net income per common share is computed based upon the weighted average
number of common shares outstanding. Common equivalent shares, using the
treasury stock method, are included in the diluted per-share calculations for
all periods when the effect of their inclusion is dilutive.
 
The following is a reconciliation of basic earnings per share ("EPS") to diluted
EPS:
 
<TABLE>
<CAPTION>
                    ------------------------------------------------------------------------------------------
                                  1995                                  1996                                  1997
                    ---------------------------------     ---------------------------------     ---------------------------------
                                                PER                                   PER                                   PER
                      INCOME        SHARES     SHARE        INCOME        SHARES     SHARE        INCOME        SHARES     SHARE
                    -----------   ----------   ------     -----------   ----------   ------     -----------   ----------   ------
<S>                 <C>           <C>          <C>        <C>           <C>          <C>        <C>           <C>          <C>
BASIC EPS
Income available
  to common
  shareholders      $14,121,885   11,316,673   $ 1.25     $19,720,638   11,424,945   $ 1.73     $25,985,779   11,474,592   $ 2.26
EFFECT OF DILUTIVE
  SECURITIES
Stock options                --      143,894    (0.02)             --      330,239    (0.05)             --      491,358    (0.09)
                    -----------   ----------    -----     -----------   ----------    -----     -----------   ----------    -----
DILUTED EPS
Income available
  to common
  shareholders      $14,121,885   11,460,567   $ 1.23     $19,720,638   11,755,184   $ 1.68     $25,985,779   11,965,950   $ 2.17
                    ===========   ==========    =====     ===========   ==========    =====     ===========   ==========    =====
</TABLE>
 
Concentration of Credit Risk
 
Financial instruments which potentially subject the Company to concentrations of
credit risk consist of cash in banks, short-term investments in U.S. Treasury
instruments and trade accounts receivable. The Company maintains its cash in
demand deposit and money market accounts held primarily by two banks.
 
Adoption of Statements of Financial Accounting Standards
 
In June 1997, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards ("SFAS") No. 130, "Reporting Comprehensive
Income", and SFAS No. 131, "Disclosures about Segments of an Enterprise and
Related Information." SFAS No. 130 establishes standards for reporting and
display of comprehensive income and its components. SFAS No. 131 specifies
revised guidelines for determining an entity's operating segments and the type
and level of financial information to be disclosed. SFAS Nos. 130 and 131 are
effective for financial statements issued for periods beginning after December
15, 1997, and accordingly, management has not determined the effect, if any, on
the Company's financial statements for its fiscal year ended December 31, 1997.
 
Reclassifications
 
Certain prior year amounts have been reclassified to conform to the 1997
presentation with no effect on net income as previously reported.
 
2.  ACQUISITIONS
 
In March 1997, the Company and its subsidiaries completed two acquisitions. The
first was a purchase of three Canadian companies and a related U.S. company, the
Isometric Group, which manufacture and distribute a line of mechanical anchors
and related products. The acquisition price was approximately $7.6 million plus
an earnout based on future sales increases. The second was the purchase, for
approximately $1.7 million, of the remaining 66% equity in Patrick Bellion,
S.A., a French manufacturer of connector products (see Note 6).
 
                                       F-9
<PAGE>   49
 
                SIMPSON MANUFACTURING CO., INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
In December 1996, Simpson Strong-Tie International, Inc. ("SSTI"), a subsidiary
of the Company, purchased the assets, including $675,000 in equipment, of the
Builders Products Division of MiTek Industries Ltd. ("MiTek") for approximately
$1,040,000. The remaining $365,000 of the purchase price represents the excess
of the purchase price over the fair value of the assets acquired. In conjunction
with the purchase of the assets, SSTI also agreed to supply MiTek and its
customers with connector products. As a result of this acquisition, the Company
determined that additional manufacturing space was needed and began the
consolidation of its UK facilities into a single location. In connection with
this consolidation, the intangible assets associated with the MiTek acquisition,
the Truline Group Ltd. ("Truline") acquisition in 1995, and the Stokes of
Cannock Ltd. acquisition in 1994, were written off during 1996.
 
In September 1995, the Company acquired the remaining 75% of the equity of a
U.S. company, Ackerman Johnson Fastening Systems, Inc., for $800,000 in cash and
$200,000 for an agreement not to compete for three years (see Note 6). In
addition, in October 1995, the Company purchased for approximately $1,450,000 in
cash the assets of Truline, a manufacturer and distributor of wall starter
systems located in Chelmsford, England. Approximately $1,100,000, $725,000 of
which was written off during 1996, of the costs of these two acquisitions
represents the excess of the purchase price over the fair value of the assets
acquired and is being amortized over ten years using the straight-line method.
 
These acquisitions have been accounted for under the purchase method of
accounting. The pro forma effect on the Company's consolidated revenue, net
income and net income per share, as if these acquisitions occurred at the
beginning of the period, is immaterial in all years presented.
 
3.  TRADE ACCOUNTS RECEIVABLE
 
Trade accounts receivable consist of the following:
 
<TABLE>
<CAPTION>
                                                            ---------------------------
                                                                   DECEMBER 31,
                                                               1996            1997
                                                            -----------     -----------
        <S>                                                 <C>             <C>
        Trade accounts receivable                           $22,242,827     $26,398,046
        Allowance for doubtful accounts                      (1,108,950)     (1,539,691)
        Allowance for sales discounts                          (203,387)       (232,787)
                                                            -----------     -----------
                                                            $20,930,490     $24,625,568
                                                            ===========     ===========
</TABLE>
 
The Company sells product on credit and generally does not require collateral.
 
4.  INVENTORIES
 
The components of inventories consist of the following:
 
<TABLE>
<CAPTION>
                                                            ---------------------------
                                                                   DECEMBER 31,
                                                               1996            1997
                                                            -----------     -----------
        <S>                                                 <C>             <C>
        Raw materials                                       $15,107,660     $17,882,930
        In-process products                                   3,763,634       5,384,709
        Finished products                                    23,376,483      31,715,306
                                                            -----------     -----------
                                                            $42,247,777     $54,982,945
                                                            ===========     ===========
</TABLE>
 
At December 31, 1996 and 1997, the replacement value of LIFO inventories
exceeded LIFO cost by approximately $1,186,000 and $852,000, respectively.
 
                                      F-10
<PAGE>   50
 
                SIMPSON MANUFACTURING CO., INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
5.  PROPERTY, PLANT AND EQUIPMENT, NET
 
Property, plant and equipment consists of the following:
 
<TABLE>
<CAPTION>
                                                          -----------------------------
                                                                  DECEMBER 31,
                                                              1996             1997
                                                          ------------     ------------
        <S>                                               <C>              <C>
        Land                                              $  2,065,682     $  3,366,519
        Buildings and site improvements                     10,379,901       17,165,509
        Leasehold improvements                               2,869,612        3,474,278
        Machinery and equipment                             46,311,624       55,400,034
                                                          ------------     ------------
                                                            61,626,819       79,406,340
        Less accumulated depreciation and amortization     (35,916,354)     (41,986,005)
                                                          ------------     ------------
                                                            25,710,465       37,420,335
        Capital projects in progress                         2,977,170        5,504,753
                                                          ------------     ------------
                                                          $ 28,687,635     $ 42,925,088
                                                          ============     ============
</TABLE>
 
Included in property, plant and equipment at December 31, 1996 and 1997, are
fully depreciated assets with an original cost of approximately $17,181,665 and
$20,104,000, respectively. These fully depreciated assets are still in use in
the Company's operations.
 
6.  INVESTMENTS
 
In 1995, Simpson Strong-Tie Company Inc. acquired a 34% interest in Patrick
Bellion S.A., a French manufacturer and distributor of connector products, for
approximately $850,000 in cash. The Company exercised its option to purchase the
remaining 66% in March 1997 and no longer accounts for this investment under the
equity method (see Note 2). The Company's 49% investment in Bulldog-Simpson GmbH
is accounted for using the equity method. The Company's equity in the earnings
or losses of its equity investments was not material in any of the three years
in the period ended December 31, 1997.
 
In 1995, Simpson Strong-Tie Company Inc. acquired the remaining 75% interest in
Ackerman-Johnson Fastening Systems Inc. (see Note 2) and no longer accounts for
this investment under the equity method.
 
7.  ACCRUED LIABILITIES
 
Accrued liabilities consist of the following:
 
<TABLE>
<CAPTION>
                                                              -------------------------
                                                                    DECEMBER 31,
                                                                 1996           1997
                                                              ----------     ----------
        <S>                                                   <C>            <C>
        Sales incentive and advertising allowances            $1,470,656     $2,686,390
        Vacation liability                                     1,062,569      1,091,718
        Other                                                  1,604,423      1,728,795
                                                              ----------     ----------
                                                              $4,137,648     $5,506,903
                                                              ==========     ==========
</TABLE>
 
                                      F-11
<PAGE>   51
 
                SIMPSON MANUFACTURING CO., INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
8.  DEBT
 
The outstanding debt at December 31, 1996 and 1997, and the available credit at
December 31, 1997, consisted of the following:
 
<TABLE>
<CAPTION>
                                                          ---------------------------------------
                                                           AVAILABLE ON        DEBT OUTSTANDING
                                                          CREDIT FACILITY       AT DECEMBER 31,
                                                          AT DECEMBER 31,     -------------------
                                                               1997            1996        1997
                                                          ---------------     -------     -------
<S>                                                       <C>                 <C>         <C>
Revolving line of credit, interest at bank's reference
  rate (at December 31, 1997, the bank's reference rate
  was 8.50%), matures June 1998, commitment fees are
  paid at the annual rate of 0.125% on the unused
  portion of the facility                                   $13,537,127       $    --     $    --
Revolving line of credit, interest at bank's prime rate
  (at December 31, 1997, the bank's prime rate was
  8.50%), matures June 1998, commitment fees are paid at
  the annual rate of 0.125% on the unused portion of the
  facility                                                    4,937,129            --          --
Revolving term commitment, interest at bank's prime rate
  (at December 31, 1997, the bank's prime rate was
  8.50%), matures June 1998, commitment fees are paid at
  the annual rate of 0.125% on the unused portion of the
  facility                                                    4,000,000            --          --
Revolving line of credit, interest rate at the bank's
  base rate of interest plus 2% (at December 31, 1997,
  this rate was 9.25%), matures June 1998, has an annual
  commission charge of 0.45%                                    411,000            --          --
Standby letter of credit facilities                             525,744            --          --
Other notes payable                                                  --            --      29,605
                                                            -----------       -------     -------
                                                             23,411,000       $    --     $29,605
                                                                              =======     =======
Less standby letters of credit issued and outstanding          (525,744)
                                                            -----------
Net credit available                                        $22,885,256
                                                            ===========
</TABLE>
 
The revolving lines of credit are guaranteed by the Company and its
subsidiaries. At December 31, 1997, the Company has two outstanding standby
letters of credit. These letters of credit, in the aggregate amount of $525,744,
are used to support the Company's self-insured workers' compensation insurance
requirements. These letters of credit mature in June 1998. Other notes payable
represent debt associated with foreign businesses acquired in March 1997.
 
9.  COMMITMENTS AND CONTINGENCIES
 
Leases
 
Certain properties occupied by the Company are leased. The leases expire at
various dates through 2012 and generally require the Company to assume the
obligations for insurance, property taxes, and maintenance of the facilities.
 
                                      F-12
<PAGE>   52
 
                SIMPSON MANUFACTURING CO., INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
Some of the properties are leased from partnerships formed by certain current
and former Company shareholders, directors, officers and employees. Rental
expenses under these related party leases are as follows:
 
<TABLE>
<CAPTION>
                                                     ----------------------------------------
                                                             YEARS ENDED DECEMBER 31,
                                                        1995           1996           1997
                                                     ----------     ----------     ----------
    <S>                                              <C>            <C>            <C>
    Simpson Investment Company                       $  185,100     $  185,100     $  185,100
    Doolittle Investors                                 230,438        231,096        239,400
    Vacaville Investors                                 437,640        437,640        437,640
    Vicksburg Investors                                 322,289        329,017        334,279
    Columbus Westbelt Investment Co.                    418,525        581,064        581,064
    McKinney Investors                                   70,620             --             --
                                                     ----------     ----------     ----------
                                                     $1,664,612     $1,763,917     $1,777,483
                                                     ==========     ==========     ==========
</TABLE>
 
Rental expense for 1995, 1996 and 1997 with respect to all other leased property
was approximately $1,120,000, $1,170,000 and $2,128,000, respectively.
 
At December 31, 1997, minimum rental commitments under all noncancelable leases
are as follows:
 
<TABLE>
                 <S>                                             <C>
                 1998                                            $ 4,567,098
                 1999                                              4,106,596
                 2000                                              4,012,430
                 2001                                              3,511,765
                 2002                                              2,752,470
                 Thereafter                                       10,161,126
                                                                 -----------
                                                                 $29,111,485
                                                                 ===========
</TABLE>
 
Some of these minimum rental commitments involve the related parties described
above, contain renewal options, and provide for periodic rental adjustments
based on changes in the consumer price index or current market rental rates.
 
In January 1998, Simpson Strong-Tie International, Inc. ("SSTI") signed the
lease, to which it was previously committed, for its recently completed facility
in the United Kingdom. The facility is approximately 78,000 square feet and will
be used for SSTI's UK operations. The nominal term of the lease is 25 years but
includes an option to terminate without penalty in either the fifteenth or
twentieth year upon one year written notice by SSTI. As such, future minimum
rental payments associated with the first 15 years of this lease are included in
minimum rental commitments in the table above. Also in January 1998, the Company
issued a letter of credit in the amount of approximately $773,000 to guarantee
performance with regard to this lease.
 
The Company has a commitment to purchase a 48,000 square foot building which it
currently leases in San Leandro, California, for approximately $1,975,000. This
purchase is expected to close in the third quarter of 1998 and future minimum
rental payments associated with this property have been excluded from the
minimum rental commitments in the above table after the expected purchase date.
In addition, the Company has commenced the construction of a new manufacturing
and distribution facility for Simpson Dura-Vent Company, Inc. in Ceres,
Mississippi, to replace its existing facility in Vicksburg, Mississippi. The
facility is expected to be 302,000 square feet and is expected to cost
approximately $5.9 million. The Company plans to complete and occupy this
facility in mid 1998.
 
                                      F-13
<PAGE>   53
 
                SIMPSON MANUFACTURING CO., INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
Environmental
 
At two of the Company's operating facilities, evidence of contamination
resulting from activities of prior occupants was discovered. The Company took
certain remedial actions at one facility in 1990 and is considering what
additional action, if any, may be required. The Company has been informed by the
lessor of the other facility, Vicksburg Investors, that appropriate remedial
action has been taken. The Company does not believe that either of these matters
will have a material adverse effect on its financial position or results of
operations.
 
Litigation
 
From time to time, the Company is involved in various legal proceedings and
other matters arising in the normal course of business.
 
10.  INCOME TAXES
 
The provision for income taxes consists of the following:
 
<TABLE>
<CAPTION>
                                               ------------------------------------------
                                                        YEARS ENDED DECEMBER 31,
                                                  1995           1996            1997
                                               ----------     -----------     -----------
        <S>                                    <C>            <C>             <C>
        Current
          Federal                              $7,536,000     $11,989,000     $15,546,000
          State                                 1,526,000       2,353,000       3,115,000
          Foreign                                      --              --         145,000
        Deferred                                 (135,000)       (773,000)     (1,039,000)
                                               ----------     -----------     -----------
                                               $8,927,000     $13,569,000     $17,767,000
                                                =========      ==========      ==========
</TABLE>
 
Reconciliations between the statutory federal income tax rates and the Company's
effective income tax rates as percentages of income before income taxes are as
follows:
 
<TABLE>
<CAPTION>
                                                            --------------------------
                                                             YEARS ENDED DECEMBER 31,
                                                            1995       1996       1997
                                                            ----       ----       ----
        <S>                                                 <C>        <C>        <C>
        Federal tax rate                                    35.0%      35.0%      35.0%
        State taxes, net of federal benefit                  5.0%       4.7%       4.2%
        Other                                               (1.3)%      1.1%       1.4%
                                                            ----       ----       ----
             Effective income tax rate                      38.7%      40.8%      40.6%
                                                            ====       ====       ====
</TABLE>
 
                                      F-14
<PAGE>   54
 
                SIMPSON MANUFACTURING CO., INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
The tax effects of the significant temporary differences that constitute the
deferred tax assets and liabilities at December 31, 1995, 1996 and 1997, are as
follows:
 
<TABLE>
<CAPTION>
                                                     ----------------------------------------
                                                             YEARS ENDED DECEMBER 31,
                                                        1995           1996           1997
                                                     ----------     ----------     ----------
    <S>                                              <C>            <C>            <C>
    Current deferred tax assets
      State tax                                      $  533,943     $  795,671     $1,037,753
      Compensation related to stock plans               246,514        165,967        140,579
      Workers' compensation                             101,815         89,657        155,416
      Health claims                                     198,333        213,476        272,393
      Vacation                                          367,379        422,392        416,268
      Accounts receivable allowance                     456,977        464,681        602,802
      Inventory allowance                               235,923        359,646        477,304
      Sales incentive and advertising allowances        508,457        237,050        206,210
      Other                                             101,114        170,915        228,025
                                                     ----------     ----------     ----------
                                                     $2,750,455     $2,919,455     $3,536,750
                                                     ==========     ==========     ==========
    Long-term deferred tax assets (liabilities)
      Depreciation                                   $  222,355     $  255,683     $  639,063
      Goodwill amortization                              (6,866)       545,068        574,269
      Other                                            (238,706)      (174,255)      (402,545)
                                                     ----------     ----------     ----------
                                                     $  (23,217)    $  626,496     $  810,787
                                                     ==========     ==========     ==========
</TABLE>
 
No valuation allowance has been recorded for deferred tax assets for the years
ended December 31, 1995, 1996 and 1997, due to the Company's taxable income in
1997 and prior years.
 
11.  PROFIT SHARING AND PENSION PLANS
 
The Company has four profit sharing plans covering substantially all salaried
employees and nonunion hourly employees. Two of the plans, covering U.S.
employees, provide for annual contributions in amounts the Board of Directors
may authorize, subject to certain limitations, but in no event more than the
amount permitted under the Internal Revenue Code as deductible expense. The
other two plans, covering the Company's European employees, require the Company
to make contributions ranging from three to ten percent of the employee's
compensation. The total cost for these four profit sharing plans for the years
ended December 31, 1995, 1996 and 1997, was approximately $2,036,000, $2,469,000
and $2,775,000, respectively.
 
The Company also contributes to various industry-wide, union-sponsored defined
benefit pension funds for union, hourly employees. Payments to these funds
aggregated approximately $486,000, $667,000 and $708,000 for the years ended
December 31, 1995, 1996 and 1997, respectively.
 
12.  RELATED PARTY TRANSACTIONS
 
The Chairman and the President and Chief Executive Officer of the Company, who
are directors and principal shareholders of the Company, served as directors and
officers of the Simpson PSB Fund (a charitable organization) until October 1997.
The Company contributed $50,000 and $207,156 to this organization in 1996 and
1997, respectively.
 
Refer to Note 9 regarding related party transactions involving Company leases.
 
                                      F-15
<PAGE>   55
 
                SIMPSON MANUFACTURING CO., INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
13.  STOCK BONUS AND STOCK OPTIONS PLANS
 
The Company applies Accounting Principles Board Opinion 25, Accounting for Stock
Issued to Employees, and related interpretations in accounting for its stock
option plans. Accordingly, no compensation cost has been recognized for its
non-qualified stock option plan as stock options granted under this plan have an
exercise price equal to 100% of the market price on the date of grant. If the
compensation cost for this plan had been determined based on the fair value at
the grant dates for awards consistent with the method of SFAS No. 123, the pro
forma effect on the Company's net income and earnings per share in 1995, 1996
and 1997 would have been:
 
<TABLE>
<CAPTION>
                                                  -------------------------------------------
                                                           YEARS ENDED DECEMBER 31,
                                                     1995            1996            1997
                                                  -----------     -----------     -----------
    <S>                                           <C>             <C>             <C>
    Net income as reported                        $14,121,885     $19,720,638     $25,985,779
    Pro forma                                      14,006,182      19,442,196      25,479,439
    Diluted earnings per share, as reported              1.23            1.68            2.17
    Pro forma                                            1.22            1.65            2.13
</TABLE>
 
The fair value of each option granted in 1995, 1996 and 1997 was estimated on
the date of grant using the Black-Sholes option-pricing model with the following
assumptions for 1995, 1996 and 1997, respectively: risk-free interest rate of
5.5% for all years; no dividend yield for all years; expected lives of 6.0, 6.0
and 6.1 years; and volatility of 27.5% for all years. The weighted average fair
value per share of options granted during 1995, 1996 and 1997 was $5.29, $9.07
and $13.17, respectively.
 
The Company currently has two stock option plans. The first is principally for
the Company's employees and the second is for the Company's independent
directors. During the last three years, the Company met most of the operating
goals established for its two stock option plans and accordingly, has granted
options to purchase 92,250 and 119,750 shares for 1995 and 1996, and has
committed to granting options to purchase 122,250 shares for 1997. These options
have an exercise price of $13.50 per share for 1995, a range of $23.00 to $29.25
per share for 1996 and a range of $33.31 to $36.64 per share for 1997.
 
The following table summarizes the Company's stock option activity for the years
ended December 31, 1995, 1996 and 1997:
 
<TABLE>
<CAPTION>
                                -------------------------------------------------------------------------
                                        1995                      1996                      1997
                                ---------------------     ---------------------     ---------------------
                                           WEIGHTED-                 WEIGHTED-                 WEIGHTED-
                                            AVERAGE                   AVERAGE                   AVERAGE
                                            EXERCISE                  EXERCISE                  EXERCISE
  NON-QUALIFIED STOCK OPTIONS   SHARES       PRICE        SHARES       PRICE        SHARES       PRICE
                                -------    ----------     -------    ----------     -------    ----------
<S>                             <C>        <C>            <C>        <C>            <C>        <C>
Outstanding at beginning of year 895,429     $ 8.77       904,114      $ 9.22       922,734      $11.29
  Granted                        92,250       13.50       110,750       23.12       122,250       33.32
  Additional grants                  --          --         9,000       23.00            --          --
  Exercised                     (82,231)       9.11       (90,191)       5.84       (61,595)       7.33
  Forfeited                      (1,334)      10.25       (10,939)      13.30        (4,972)      18.66
                                -------                   -------                   -------
Outstanding at end of year      904,114        9.22       922,734       11.29       978,417       14.27
                                =======                   =======                   =======
</TABLE>
 
The number of stock options exercisable at the end of 1995, 1996 and 1997 was
736,740, 694,779 and 700,497, respectively.
 
                                      F-16
<PAGE>   56
 
                SIMPSON MANUFACTURING CO., INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
The following table summarizes information about the Company's stock options
outstanding at December 31, 1997:
 
<TABLE>
<CAPTION>
                                       -------------------------------------------------------------
                                                OPTIONS OUTSTANDING
                                       -------------------------------------     OPTIONS EXERCISABLE
                                                      WEIGHTED-                -----------------------
                                         NUMBER        AVERAGE     WEIGHTED-     NUMBER      WEIGHTED-
                                       OUTSTANDING    REMAINING     AVERAGE    OUTSTANDING    AVERAGE
                                       AT DECEMBER   CONTRACTUAL   EXERCISE    AT DECEMBER   EXERCISE
          RANGE OF EXERCISE PRICES      31, 1997        LIFE         PRICE      31, 1997       PRICE
          ------------------------     -----------   -----------   ---------   -----------   ---------
          <S>                          <C>           <C>           <C>         <C>           <C>
                         $3.64           170,028      3.3 years     $  3.64      170,028      $  3.64
                        $11.50           401,974      3.4 years       11.50      401,974        11.50
              $10.00 to $11.28            93,248      4.1 years       10.24       66,181        10.23
                        $13.50            75,209      5.0 years       13.50       36,038        13.50
              $23.00 to $29.25           115,708      6.0 years       23.12       24,276        23.51
              $33.31 to $36.64           122,250      7.0 years       33.32        2,000        33.00
                                       -----------                             -----------
               $3.64 to $36.64           978,417      4.3 years       14.27      700,497         9.96
                                       ==========                              ==========
</TABLE>
 
The Company also maintains a Stock Bonus Plan whereby for each ten years of
continuous employment with the Company each employee who does not participate in
the Company's stock option plans receives 100 shares of common stock. In 1995,
1996 and 1997, the Company committed to issue 2,600, 4,500 and 5,300 shares,
resulting in compensation charges of $61,250, $180,155 and $305,038,
respectively. The shares are issued in the year following the year in which they
are earned.
 
                                      F-17
<PAGE>   57
 
                           Simpson Manufacturing Co. Logo


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