| SIMPSON MANUFACTURING CO INC /CA/      Item 1A Risk Factors | 
    
      | You should carefully consider the following risks before you decide to buy     shares of our common stock | 
    
      | If any of the following risks actually occurs,     our business, results of operations or financial condition would likely     suffer | 
    
      | In such case, the trading price of our common stock could decline,     and you may lose all or part of the money you paid to buy our stock | 
    
      | This and other public reports may contain forward-looking statements based     on current expectations, assumptions, estimates and projections about us and     our  industry | 
    
      | These  forward-looking  statements  involve  risks and     uncertainties | 
    
      | Our  actual results could differ materially from those     forward-looking  statements as a result of many factors, as more fully     described below and elsewhere in our public reports | 
    
      | We do not undertake to     update publicly any forward-looking statements for any reason, even if new     information becomes available or other events occur in the future | 
    
      | Failure to comply with industry regulations could harm our business and     financial condition | 
    
      | The design, capacity and quality of most of our products and manufacturing     processes are subject to numerous and extensive regulations and standards     promulgated by governmental, quasi-governmental and industry organizations | 
    
      | These regulations and standards are highly technical, complex and subject to     frequent revision | 
    
      | If our products or manufacturing processes fail to comply     with any regulations or standards, we may not be able to manufacture and     market our products profitably | 
    
      | Failure to comply with regulations and     standards could therefore materially and adversely affect our business and     financial condition | 
    
      | If we fail to compete effectively, our revenue and profit margins could     decline | 
    
      | We  face  a  variety  of competition in all of the markets in which we     participate | 
    
      | Many of our competitors have greater financial and other     resources than we do | 
    
      | In addition, other technologies may be the bases for     competitive  products  that  could  render  our  products  obsolete or     noncompetitive | 
    
      | Other companies may find the our markets attractive and     enter those markets | 
    
      | Competitive pricing, including price competition or the     introduction of new products, could have material adverse effects on our     revenues and profit margins | 
    
      | Our ability to compete effectively depends to a significant extent on the     specification or approval of our products by architects, engineers, building     inspectors, building code officials and customers | 
    
      | If a significant segment     of  those  communities  were  to  decide  that  the design, materials,     manufacturing, testing or quality control of our products is inferior to     that of any of our competitors, our sales and profits would be materially     and adversely affected | 
    
      | If we lose a large customer, our sales and profits would decline | 
    
      | In particular, one     customer  accounted for 17prca of our net sales in 2005 | 
    
      | Loss of all or a     part of our sales to a large customer would have a material adverse effect     on  our  revenues  and  profits | 
    
      | Our  customers include retailers and     distributors | 
    
      | Retail and distribution businesses have consolidated over     time, which could exacerbate the material adverse effect of losing any of     them | 
    
      | 12     ______________________________________________________________________         An increase in the price of raw materials could negatively affect our sales     and profits | 
    
      | Our principal raw material is steel, including stainless steel | 
    
      | The steel     industry is highly cyclical | 
    
      | Numerous factors beyond our control, such as     general economic conditions, competition, worldwide demand, labor costs,     energy costs, and import duties and other trade restrictions, influence     prices for our raw materials | 
    
      | In March 2002, for example, the United States     imposed tariffs on several types of imported steel, which increased our cost     of  steel | 
    
      | In addition, consolidation among domestic integrated steel     producers, changes in supply and demand in steel markets, the weakening     United States dollar and other events have led to increased steel costs | 
    
      | The     domestic steel market is heavily influenced by three major United States     manufacturers | 
    
      | We have not always been     able, and in the future we might not be able, to increase our product prices     in amounts that correspond to increases in costs of raw materials, without     materially  and adversely affecting our sales and profits | 
    
      | If  we  cannot  protect our technology, we will not be able to compete     effectively | 
    
      | Our ability to compete effectively with other companies depends in part on     our  ability  to maintain the proprietary nature of our technology, in     part through  patents | 
    
      | Patents might not issue pursuant to pending patent applications | 
    
      | Others might independently develop the same or similar technology, develop     around the patented aspects of any of our products or proposed products, or     otherwise obtain access to our proprietary technology | 
    
      | We also rely on     unpatented proprietary technology to maintain our competitive position | 
    
      | We     might not be able to protect our know-how or other proprietary information | 
    
      | If we are unable to maintain the proprietary nature of our significant     products, our business and financial condition could be materially and     adversely affected | 
    
      | In attempting to protect our proprietary information, we sometimes initiate     lawsuits against competitors and others that we believe have infringed or     are  infringing our rights | 
    
      | In such an event, the defendant may assert     counterclaims to complicate or delay the litigation, or for other reasons | 
    
      | Litigation may be very costly and may result in adverse judgments that     affect our business and financial condition materially and adversely | 
    
      | Integrating acquired businesses may divert management’s attention away from     our day-to-day operations | 
    
      | In the future, we may pursue acquisitions of product lines or businesses | 
    
      | Acquisitions involve numerous risks, including, for example:         •                  difficulties assimilating the operations and products of     acquired businesses;         •                  diversion of management’s attention from other business     concerns;         •                  overvaluation of acquired businesses;         •                   acceptance of acquired businesses’ products by our     customers;         •                  risks of entering markets in which we have little or no     prior experience;         •                  litigation involving activities, properties or products     of acquired businesses;         •                   consumer  claims  related  to products of acquired     businesses; and         •                   the  potential  loss  of key employees of acquired     businesses | 
    
      | The integration of our acquired operations, products and personnel may place     a significant burden on management and our internal resources | 
    
      | The diversion     of management attention and any difficulties encountered in the transition     and integration process could harm our business | 
    
      | In addition, future acquisitions may cause us to issue additional equity     securities that dilute the value of our existing equity securities, increase     our debt, and cause impairment and amortization expenses related to goodwill     and  other intangible assets | 
    
      | These actions could adversely affect our     profitability | 
    
      | Any acquisition could adversely affect our business and     operating results | 
    
      | 13     ______________________________________________________________________         Significant costs to integrate our acquired operations may negatively affect     our financial condition and the market price of our stock | 
    
      | We will incur costs from integrating acquired business operations, products     and personnel | 
    
      | These costs may be significant and may include expenses and     other  liabilities for employee redeployment, relocation or severance,     combining teams and processes in various functional areas, reorganization or     closures of facilities, and relocation or disposition of excess equipment | 
    
      | The integration costs that we incur may negatively affect our financial     condition and the market price of our stock | 
    
      | Our future growth may depend on our ability to penetrate new domestic and     international markets, which could reduce our profitability | 
    
      | International construction customs, standards, techniques and methods differ     from those in the United States | 
    
      | Laws and regulations applicable in new     markets may be unfamiliar to us | 
    
      | Compliance may be substantially more costly     than we anticipate | 
    
      | As a result, we may need to redesign products, or invent     or  design  new products, to compete effectively and profitably in new     markets | 
    
      | We expect that we will need significant time, which may be years,     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 our products, political     instability, currency controls, changes in import and export regulations,     changes in tariff and freight rates, and fluctuations in foreign exchange     rates | 
    
      | We might not be able to penetrate these markets and any market     penetration that occurs might not be timely or profitable | 
    
      | If we do not     penetrate these markets within a reasonable time, we will be unable to     recoup part or all of the significant investments we will have made in     attempting to do so | 
    
      | Our sales are seasonal, with operating results varying from quarter to     quarter | 
    
      | With some exceptions, our sales and income have historically been     lower in the first and fourth quarters than in the second and third quarters     of the year, as customers purchase construction materials in the late spring     and  summer  months  for the construction season | 
    
      | In addition, weather     conditions, such as unseasonably warm, cold or wet weather, which affect,     and sometimes delay or accelerate, installation of some of our products,     significantly affect our results of operations | 
    
      | We have little control over the timing of customer purchases | 
    
      | Sales that we     anticipate in one quarter may occur in another quarter, affecting both     quarters’ results | 
    
      | In addition, we incur significant expenses as we develop,     produce  and  market our products in anticipation of future orders | 
    
      | We     maintain high inventory levels and typically ship orders as we receive them,     so we operate 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 our operating expenses is fixed | 
    
      | Planned expenditures are based     primarily on sales forecasts | 
    
      | When sales do not meet our expectations, our     operating results will be reduced for the relevant quarters, as we will have     already incurred expenses based on those expectations | 
    
      | Our  principal markets are in the building construction industry | 
    
      | That     industry  is  subject to significant volatility due to fluctuations in     interest rates, the availability of credit to builders and developers,     inflation  rates, weather, and other factors and trends | 
    
      | Declines in commercial and     residential construction may well reduce the demand for our products | 
    
      | Future     negative economic or construction industry performance could adversely     affect our business | 
    
      | Declines in construction activity or demand for our     products could materially and adversely affect our business and financial     condition | 
    
      | Product liability claims and product recalls could harm our reputation,     sales and financial condition | 
    
      | We  design and manufacture most of our standard products and expect to     continue to do so, although we buy raw materials and some manufactured     products from others | 
    
      | We have on occasion found flaws and deficiencies in     the  manufacturing, design or testing of our products | 
    
      | We also have on     occasion found flaws and deficiencies in raw materials and finished goods     produced by others | 
    
      | Some flaws and deficiencies have not been apparent until     after the products were installed by customers | 
    
      | Many of our products are integral to the structural soundness or safety of     the structures in which they are used | 
    
      | If any flaws or deficiencies exist in     our  products and if such flaws or deficiencies are not discovered and     corrected before                                           14     ______________________________________________________________________         our products are incorporated into structures, the structures could be     unsafe or could suffer severe damage, such as collapse or fire, and personal     injury could result | 
    
      | Errors in the installation of our products, even if the     products are free of flaws and deficiencies, could also cause personal     injury and unsafe structural conditions | 
    
      | To the extent that such damage or     injury is not covered by our product liability insurance and we are held to     be liable, we could be required to correct such damage and to compensate     persons who might have suffered injury, and our reputation, business and     financial condition could be materially and adversely affected | 
    
      | Even if a flaw or deficiency is discovered before any damage or injury     occurs, we may need to recall products, and we may be liable for any costs     necessary to replace recalled products or retrofit the affected structures | 
    
      | Any such recall or retrofit could entail substantial costs and adversely     affect  our reputation, sales and financial condition | 
    
      | We do not carry     insurance against recall costs or the adverse business effect of a recall,     and our product liability insurance may not cover retrofit costs | 
    
      | Claims resulting from a natural disaster might be made against us with     regard to damage or destruction of structures incorporating our products | 
    
      | Any such claims, if asserted, could materially and adversely affect our     business and financial condition | 
    
      | Complying or failing to comply with environmental, health and safety laws     and regulations could affect us materially and adversely | 
    
      | We are 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 | 
    
      | We are also     subject to other federal and state laws and regulations regarding health and     safety matters | 
    
      | Our manufacturing operations involve the use of solvents, chemicals, oils     and other materials that are regarded as hazardous or toxic | 
    
      | We also use     complex  and heavy machinery and equipment that can pose severe safety     hazards, especially if not properly and carefully used | 
    
      | Some of our products     also incorporate materials that are hazardous or toxic in some forms, such     as zinc and lead used in some steel galvanizing processes and chemicals used     in our acrylic and epoxy anchoring products | 
    
      | The gun powder used in our     powder actuated tools is explosive | 
    
      | Misuse of other materials in some of our     products could also cause injury or sickness | 
    
      | If  we  do  not  obtain  all material licenses and permits required by     environmental, health and safety laws and regulations, we may be subject to     regulatory  action  by  governmental  authorities | 
    
      | If our policies and     procedures do not comply in all respects with existing environmental, health     and safety laws and regulations, our activities might violate such laws and     regulations | 
    
      | Even  if  our policies and procedures do comply, but our     employees fail or neglect to follow them in all respects, we might incur     similar liability | 
    
      | Relevant laws and regulations could change or new ones     could be adopted that require us to obtain additional licenses and permits     and cause us to incur substantial expense | 
    
      | Our  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 | 
    
      | We may need to take remedial     action if properties that we occupy are contaminated by hazardous or toxic     substances | 
    
      | Any change in laws or regulations, any legal or regulatory violations, or     any contamination, could materially and adversely affect our business and     financial condition | 
    
      | New appliance efficiency standards could materially and adversely affect our     operating results and financial condition | 
    
      | The Department of Energy regulates energy efficiency under the authority of     the  National  Appliance  Energy Conservation Act | 
    
      | Under this Act, the     Department of Energy periodically reviews the need for increased efficiency     standards with respect to gas furnaces and gas water heaters | 
    
      | A substantial     percentage of our Type B Gas Vent sales are for gas furnaces and gas water     heaters | 
    
      | The Department of Energy might adopt minimum appliance efficiency     standards that negatively affect sales of Type B Gas Vents, which could     materially  and  adversely  affect our operating results and financial     condition | 
    
      | 15     ______________________________________________________________________         We depend on key management and technical personnel, the loss of whom could     harm our business | 
    
      | We depend on certain key management and technical personnel, including,     among others, Thomas J Fitzmyers, Michael J Herbert, Stephen B Lamson,     Barclay  Simpson  and Stephen P Eberhard | 
    
      | The loss of one or more key     employees could materially and adversely affect us | 
    
      | Our success also depends on our ability to attract and retain additional     highly qualified technical, marketing and management personnel necessary for     the maintenance and expansion of our activities | 
    
      | We face strong competition     for  such  personnel | 
    
      | Any  work  stoppage or  interruption by employees could materially and     adversely affect our business and financial condition | 
    
      | A significant number of our employees are represented by labor unions and     are covered by collective bargaining agreements that will expire in 2007 and     early 2008 | 
    
      | A work stoppage or interruption by a significant number of our     employees could have a material and adverse effect on our business and     financial condition | 
    
      | International operations expose us to foreign exchange rate risk | 
    
      | We have foreign exchange rate risk in our international operations and     through purchases from foreign vendors | 
    
      | We do not currently hedge this risk | 
    
      | Natural disasters could decrease our manufacturing capacity | 
    
      | Most of our current and planned manufacturing facilities are located in     geographic regions that have 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 our facilities in San Leandro, California | 
    
      | The     earthquakes in Northridge, California, in January 1994, destroyed several     freeways and numerous buildings in the region in which our facilities in     Brea  are  located | 
    
      | Our disaster recovery plan may not be adequate or     effective | 
    
      | We do not carry earthquake insurance | 
    
      | Other insurance that we     carry  is limited in the risks covered and the amount of coverage | 
    
      | Our     insurance  would  not be adequate to cover all of our resulting costs,     business interruption and lost profits when a major natural disaster occurs | 
    
      | A natural disaster rendering one or more of our manufacturing facilities     totally or partially unusable, whether or not covered by insurance, would     materially and adversely affect our business and financial condition | 
    
      | Control by our principal stockholders will prevent other stockholders from     influencing management | 
    
      | Barclay  Simpson,  the  Chairman  of  our Board of Directors, controls     approximately 22prca of the outstanding shares of our Common Stock | 
    
      | Thomas J     Fitzmyers, our President and Chief Executive Officer, owns approximately 1prca     of the outstanding shares of our Common Stock | 
    
      | Simpson and Fitzmyers have substantial influence with respect to the     election of the directors and are also expected to continue to exercise     substantial control over fundamental changes affecting us, such as a merger     or  sale of assets or amendment of our Certificate of Incorporation or     Bylaws | 
    
      | Barclay Simpson, Thomas J Fitzmyers and Stephen B Lamson, three of our     executive officers, have had conflicts of interest regarding properties that     we have leased from partnerships in which those officers participate | 
    
      | Two of     those partnerships lease to us manufacturing and warehouse facilities that     we currently use | 
    
      | Based on formal and informal third-party appraisals, we     believe that some of the rent and other terms under these leases are less     favorable to us than terms that could be obtained from unrelated persons in     the current real estate markets | 
    
      | The leases may be amended, renewed or     replaced at any time or from time to time | 
    
      | Simpson,     Fitzmyers and Lamson would be subject to conflicting interests in their     capacities as partners in the partnerships and as officers, directors and     stockholders of Simpson Manufacturing Co, Inc | 
    
      | 16     ______________________________________________________________________         Any issuance of preferred stock may dilute your investment and reduce funds     available for dividends | 
    
      | Our Board of Directors is authorized by our Certificate 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 our     Board of Directors may approve | 
    
      | Any such issuance could be used to impede an     acquisition of our business that our Board of Directors does not approve,     further dilute the equity investments of holders of our Common Stock and     reduce funds available for the payment of dividends to holders of our Common     Stock | 
    
      | Our stock price is likely to be volatile and could drop | 
    
      | The trading price of our 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 us or our competitors, general conditions in     the construction and construction materials industries, relatively low     trading volume in our 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 | 
    
      | Securities market fluctuations may adversely     affect the market price of our Common Stock | 
    
      | Future sales of common stock could adversely affect our stock price | 
    
      | Sales of substantial amounts of our Common Stock in the public market could     adversely affect the prevailing market price for the Common Stock | 
    
      | All of     the outstanding shares of our Common Stock are freely tradable without     restriction under the Securities Act of 1933, other than 11dtta5 million shares     held (as of February 23, 2006) by our “affiliates,” as that term is defined     in  Rule 144 under the Securities Act of 1933 | 
    
      | Options to purchase 3dtta0     million shares of our Common Stock were outstanding as of December 31, 2005,     including options to purchase 1dtta7 million 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 our Common Stock in     the public market could be adversely affected | 
    
      | Delaware  law  and  our  stockholder rights plan contain anti-takeover     provisions  that could deter takeover attempts that might otherwise be     beneficial to our stockholders | 
    
      | Provisions of Delaware law could make it more difficult for a third party to     acquire  us, even if doing so would be beneficial to our stockholders | 
    
      | Section 203 of the Delaware General Corporation Law may make the acquisition     of Simpson Manufacturing Co, Inc | 
    
      | and the removal of incumbent officers and     directors more difficult by prohibiting stockholders holding 15prca or more of     our outstanding voting stock from acquiring Simpson Manufacturing Co, Inc | 
    
      | without the consent of our Board of Directors for at least three years from     the date they first hold 15prca or more of the voting stock | 
    
      | Barclay Simpson     and his affiliates are not subject to this provision of Delaware law with     respect to their investment in Simpson Manufacturing Co, Inc | 
    
      | In addition,     our Stockholder Rights Plan has significant anti-takeover effects by causing     substantial dilution to a person or group that attempts to acquire us on     terms not approved by our Board of Directors | 
    
      | We are subject to a number of significant risks that might cause the our     actual  results  to  vary  materially  from our forecasts, targets, or     projections, including:         •                  lack of market acceptance of new products;         •                  increased labor costs, including significant increases in     worker’s compensation insurance premiums and health care benefits;         •                   failing  to  continue to increase net revenues and     operating income in our operating segments;         •                   failing to anticipate, appropriately invest in and     effectively  manage  the  human, information technology and logistical     resources  necessary  to support the growth of our business, including     managing the costs associated with such resources;         •                  failing to integrate, leverage and generate expected     rates of return on investments, including expansion of existing businesses     and expansion through domestic and foreign acquisitions;                                           17     ______________________________________________________________________         •                  failing to generate sufficient future positive operating     cash flows and, if necessary, secure adequate external financing to fund our     growth; and         •                  interruptions in service by common carriers that ship     goods within our distribution channels | 
    
      | Our management is responsible for establishing and maintaining adequate     internal control over financial reporting | 
    
      | Internal control over financial     reporting  is  a process to provide reasonable assurance regarding the     reliability of financial reporting for external purposes in accordance with     accounting principles generally accepted in the United States | 
    
      | Internal     control  over financial reporting includes maintaining records that in     reasonable detail accurately and fairly reflect our transactions; providing     reasonable  assurance  that transactions are recorded as necessary for     preparation of the consolidated financial statements; providing reasonable     assurance  that  receipts  and  expenditures of our assets are made in     accordance with management authorization; and providing reasonable assurance     that unauthorized acquisition, use or disposition of our assets that could     have a material effect on the consolidated financial statements would be     prevented  or  detected  on  a  timely  basis | 
    
      | Because of its inherent     limitations, internal control over financial reporting is not intended to     provide absolute assurance that a misstatement of our consolidated financial     statements would be prevented or detected | 
    
      | Our growth and entry into new,     globally dispersed markets will place significant additional pressure on our     system of internal control over financial reporting | 
    
      | Any failure to maintain     an effective system of internal control over financial reporting could limit     our ability to report our financial results accurately and timely or to     detect and prevent fraud |