<SUBMISSION>
<ACCESSION-NUMBER>0000912057-02-029033
<TYPE>S-8
<PUBLIC-DOCUMENT-COUNT>4
<FILING-DATE>20020730
<EFFECTIVENESS-DATE>20020730
<FILER>
<COMPANY-DATA>
<CONFORMED-NAME>SIMPSON MANUFACTURING CO INC /CA/
<CIK>0000920371
<ASSIGNED-SIC>3420
<IRS-NUMBER>943196943
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<FILING-VALUES>
<FORM-TYPE>S-8
<ACT>33
<FILE-NUMBER>333-97315
<FILM-NUMBER>02714395
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>4120 DUBLILN BLVD STE 400
<CITY>DUBLIN
<STATE>CA
<ZIP>94568
<PHONE>9255609000
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>4120 DUBLIN BLVD STE 400
<CITY>DUBLIN
<STATE>CA
<ZIP>94568
</MAIL-ADDRESS>
</FILER>
<DOCUMENT>
<TYPE>S-8
<SEQUENCE>1
<FILENAME>a2085305zs-8.htm
<DESCRIPTION>S-8
<TEXT>
<HTML>
<HEAD>
<TITLE>
</TITLE>
</HEAD>
<BODY BGCOLOR="#FFFFFF" LINK=BLUE  VLINK=PURPLE>
<BR>
<FONT SIZE=3 ><A HREF="#02SFO1764_1">QuickLinks</A></FONT>
<font size=3> -- Click here to rapidly navigate through this document</font>
<P ALIGN="CENTER"><FONT SIZE=2><B>As filed with the Securities and Exchange Commission on July&nbsp;30, 2002  </B></FONT></P>

<P ALIGN="RIGHT"><FONT SIZE=2><B> Registration No.333-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </B></FONT></P>

<HR NOSHADE>
<HR NOSHADE>
<P ALIGN="CENTER"><FONT SIZE=5><B>SECURITIES AND EXCHANGE COMMISSION<BR>  </B></FONT><FONT SIZE=2><B>Washington, D.C. 20549  </B></FONT></P>

<HR NOSHADE ALIGN="CENTER" WIDTH="120">
<P ALIGN="CENTER"><FONT SIZE=5><B>FORM S-8  </B></FONT></P>

<P ALIGN="CENTER"><FONT SIZE=5><B> REGISTRATION STATEMENT UNDER<BR>
THE SECURITIES ACT OF 1933  </B></FONT></P>

<HR NOSHADE ALIGN="CENTER" WIDTH="120">
<P ALIGN="CENTER"><FONT SIZE=5><B> SIMPSON MANUFACTURING CO.,&nbsp;INC.<BR>  </B></FONT><FONT SIZE=2>(Exact name of registrant as specified in its charter) </FONT></P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="49%" ALIGN="CENTER"><FONT SIZE=2><B>Delaware</B></FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="49%" ALIGN="CENTER"><FONT SIZE=2><B>94-3196943</B></FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="49%" ALIGN="CENTER"><FONT SIZE=2>(State or other jurisdiction of<BR>
incorporation or organization)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="49%" ALIGN="CENTER"><FONT SIZE=2>(I.R.S. Employer<BR>
Identification No.)</FONT></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->

<P ALIGN="CENTER"><FONT SIZE=2><B>4120 Dublin Boulevard, Suite 400, Dublin, California 94568<BR>  </B></FONT><FONT SIZE=2>(Address of Principal Executive Offices)&nbsp;&nbsp;&nbsp;&nbsp;(Zip Code) </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><B>1994 STOCK OPTION PLAN<BR>  </B></FONT><FONT SIZE=2>(Full title of the plan) </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><B>Michael J. Herbert<BR>
Chief Financial Officer<BR>
4120 Dublin Boulevard, Suite 400<BR>
Dublin, CA 94568<BR>  </B></FONT><FONT SIZE=2>(Name and address of agent for service) </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><B>(925)&nbsp;560-9000<BR>  </B></FONT><FONT SIZE=2>(Telephone number, including area code, of agent for service) </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><B>CALCULATION OF REGISTRATION FEE  </B></FONT></P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD COLSPAN=9><HR NOSHADE></TD>
</TR>
<TR VALIGN="BOTTOM">
<TH WIDTH="30%" ALIGN="LEFT"><FONT SIZE=1><B>Title of securities to be registered<BR> </B></FONT><BR></TH>
<TH WIDTH="1%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="15%" ALIGN="CENTER"><FONT SIZE=1><B>Amount to be<BR>
registered</B></FONT><BR></TH>
<TH WIDTH="1%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="15%" ALIGN="CENTER"><FONT SIZE=1><B>Proposed<BR>
maximum<BR>
offering price<BR>
per unit&nbsp;(1)</B></FONT><BR></TH>
<TH WIDTH="1%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="19%" ALIGN="CENTER"><FONT SIZE=1><B>Proposed<BR>
maximum<BR>
aggregate offering<BR>
price&nbsp;(1)</B></FONT><BR></TH>
<TH WIDTH="1%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="16%" ALIGN="CENTER"><FONT SIZE=1><B>Amount of<BR>
registration fee</B></FONT><BR></TH>
</TR>
<TR VALIGN="TOP">
<TD COLSPAN=9><HR NOSHADE></TD>
</TR>
<TR BGCOLOR="#CCEEFF" VALIGN="BOTTOM">
<TD WIDTH="30%"><FONT SIZE=2>Common Stock ($.01 par value)</FONT></TD>
<TD WIDTH="1%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="15%" ALIGN="CENTER"><FONT SIZE=2>2,000,000</FONT></TD>
<TD WIDTH="1%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="15%" ALIGN="CENTER"><FONT SIZE=2>$51.425</FONT></TD>
<TD WIDTH="1%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="CENTER"><FONT SIZE=2>$102,850,000</FONT></TD>
<TD WIDTH="1%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="16%" ALIGN="CENTER"><FONT SIZE=2>$9,462.20</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD COLSPAN=9><HR NOSHADE></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->

<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>(1)</FONT></DT><DD><FONT SIZE=2>Estimated
solely for the purpose of calculating the registration fee in accordance with Rules&nbsp;457(c) and (h) under the Securities Act of 1933, based upon the average of the
high and low prices reported on the New York Stock Exchange on July&nbsp;23, 2002. </FONT></DD></DL>
<HR NOSHADE>
<HR NOSHADE>
<HR NOSHADE>
<!-- ZEQ.=1,SEQ=1,EFW="2085305",CP="SIMPSON MANUFACTURING CO.",DN="1",CHK=305441,FOLIO='blank',FILE='DISK038:[02SFO4.02SFO1764]BA1764A.;3',USER='CSTCLAI',CD='29-JUL-2002;15:32' -->
<!-- THIS IS THE END OF A COMPOSITION COMPONENT -->

<P><FONT SIZE=2><A
NAME="page_de1764_1_2"> </A> </FONT> <FONT SIZE=2>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Registrant filed a Form&nbsp;S-8 Registration Statement (File No.&nbsp;033-85662) on October&nbsp;27, 1994 (the "Original&nbsp;S-8"), to
register 1,200,000 shares of Registrant's Common Stock that are reserved for issuance under Registrant's 1994 Stock Option Plan (the "Plan"). Registrant subsequently filed a
Form&nbsp;S-8 Registration Statement (File No.&nbsp;333-37325) on October&nbsp;7, 1997 (the "Second&nbsp;S-8"), to register an additional 300,000 shares of
Registrant's Common Stock that are reserved for issuance under the Plan. Registrant amended the Second&nbsp;S-8 on May&nbsp;25, 1999. Registrant filed a Form&nbsp;S-8
Registration Statement (File No.&nbsp;333-40858) on July&nbsp;6, 2000 (the "Third S-8"), to register an additional 500,000 shares of Registrant's Common Stock that are
reserved for issuance under the Plan. This Form&nbsp;S-8 Registration Statement registers an additional 2,000,000 shares of Registrant's Common Stock that are reserved for issuance under
the Plan. Registrant incorporates herein by reference the Original&nbsp;S-8, the Second&nbsp;S-8, as amended, and the Third&nbsp;S-8. </FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;At
a special meeting on July&nbsp;29, 2002, the stockholders of Registrant approved an amendment of the Plan to increase by 2,000,000 (from 2,000,000 to 4,000,000) the number of shares
of Registrant's Common Stock that may be issued on exercise of options granted under the Plan. A copy of the Plan, as so amended, is filed as Exhibit&nbsp;4.1 hereto. </FONT></P>

<P><FONT SIZE=2><B>Item 5. Interests of Named Experts and Counsel.  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Counsel for Registrant, Shartsis, Friese&nbsp;&amp; Ginsburg LLP, has rendered an opinion that the shares of Common Stock registered hereby have been duly
authorized and, when sold and delivered as contemplated in this Registration Statement and in accordance with Registrant's 1994 Stock Option Plan, will be validly issued, fully paid and
non-assessable. Partners and associates of Shartsis, Friese&nbsp;&amp; Ginsburg LLP beneficially own a total of 8,701 shares of Registrant's Common Stock. </FONT></P>

<P><FONT SIZE=2><B>Item 8. Exhibits.  </B></FONT></P>

<UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>4.1</FONT></DT><DD><FONT SIZE=2>Registrant's
1994 Stock Option Plan, as amended through July&nbsp;29, 2002
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>5.1</FONT></DT><DD><FONT SIZE=2>Opinion
of Shartsis, Friese&nbsp;&amp; Ginsburg LLP as to the legality of the securities being registered
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>23.1</FONT></DT><DD><FONT SIZE=2>Consent
of PricewaterhouseCoopers LLP
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>23.2</FONT></DT><DD><FONT SIZE=2>Consent
of Shartsis, Friese&nbsp;&amp; Ginsburg LLP (contained in Exhibit&nbsp;5.1) </FONT></DD></DL>
</UL>
<P ALIGN="CENTER"><FONT SIZE=2>2</FONT></P>

<HR NOSHADE>
<!-- ZEQ.=1,SEQ=2,EFW="2085305",CP="SIMPSON MANUFACTURING CO.",DN="1",CHK=801602,FOLIO='2',FILE='DISK038:[02SFO4.02SFO1764]DE1764A.;3',USER='CSTCLAI',CD='29-JUL-2002;15:34' -->
<UL>
<UL>
</UL>
</UL>
<!-- THIS IS THE END OF A COMPOSITION COMPONENT -->
<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="page_jc1764_1_3"> </A> </FONT></P>

<!-- TOC_END -->
<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="jc1764_signatures"> </A>
<A NAME="toc_jc1764_1"> </A>
<BR></FONT><FONT SIZE=2><B>SIGNATURES    <BR>  </B></FONT></P>

<P><FONT SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Registrant.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, as amended, Registrant certifies that it has
reasonable grounds to believe that it meets all of the requirements for filing on Form&nbsp;S-8 and has duly caused this Form&nbsp;S-8 Registration Statement to be signed
on its behalf by the undersigned, thereunto duly authorized, in the City of Dublin, State of California, on July&nbsp;29, 2002. </FONT></P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="47%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD COLSPAN=3><FONT SIZE=2>SIMPSON MANUFACTURING CO.,&nbsp;INC.</FONT><FONT SIZE=2><BR>
(Registrant)</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="47%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="5%"><FONT SIZE=2><BR>
By:</FONT></TD>
<TD WIDTH="1%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="45%" ALIGN="CENTER"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>MICHAEL J. HERBERT</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Michael J. Herbert<BR>
Chief Financial Officer</FONT></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->

<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="jc1764_power_of_attorney"> </A>
<A NAME="toc_jc1764_2"> </A>
<BR></FONT><FONT SIZE=2><B>POWER OF ATTORNEY    <BR>  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints Michael J. Herbert his or her
attorney-in-fact, with full power of substitution and resubstitution, for him or her in any and all capacities, to sign any amendments to this Registration Statement, and to
file the same, with exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, hereby ratifying and confirming all that said
attorney-in-fact, or his or her substitute or substitutes, may do or cause to be done by virtue hereof. </FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to the requirements of the Securities Act of 1933, this Registration Statement has been signed below by the following persons in the capacities and on the dates indicated: </FONT></P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="52%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="BOTTOM">
<TH WIDTH="70%" ALIGN="CENTER"><FONT SIZE=1><B>SIGNATURE</B></FONT><HR NOSHADE></TH>
<TH WIDTH="4%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="26%" ALIGN="CENTER"><FONT SIZE=1><B>DATE</B></FONT><HR NOSHADE></TH>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="70%" VALIGN="TOP"><BR><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%" VALIGN="TOP"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="26%" VALIGN="TOP"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="70%" VALIGN="TOP"><FONT SIZE=2>/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>THOMAS J FITZMYERS</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Thomas&nbsp;J Fitzmyers<BR>
President, Chief Executive Officer<BR>
and Director (Principal Executive Officer)</FONT></TD>
<TD WIDTH="4%" VALIGN="TOP"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="26%" ALIGN="CENTER" VALIGN="TOP"><FONT SIZE=2>July 29, 2002</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="70%" VALIGN="TOP"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>MICHAEL J. HERBERT</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Michael&nbsp;J. Herbert<BR>
Chief Financial Officer, Treasurer,<BR>
and Secretary (Principal Financial<BR>
and Accounting Officer)</FONT></TD>
<TD WIDTH="4%" VALIGN="TOP"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="26%" ALIGN="CENTER" VALIGN="TOP"><FONT SIZE=2><BR>
July 29, 2002</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="70%" VALIGN="TOP"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>BARCLAY SIMPSON</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Barclay Simpson<BR>
Chairman of Board of Directors</FONT></TD>
<TD WIDTH="4%" VALIGN="TOP"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="26%" ALIGN="CENTER" VALIGN="TOP"><FONT SIZE=2><BR>
July 29, 2002</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="70%" VALIGN="TOP"><BR><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%" VALIGN="TOP"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="26%" VALIGN="TOP"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
</TR>
</TABLE>
<!-- insert table folio -->
<P ALIGN="CENTER"><FONT SIZE=2>3</FONT></P>

<HR NOSHADE>
<!-- ZEQ.=1,SEQ=3,EFW="2085305",CP="SIMPSON MANUFACTURING CO.",DN="1",CHK=554141,FOLIO='3',FILE='DISK038:[02SFO4.02SFO1764]JC1764A.;5',USER='CSTCLAI',CD='29-JUL-2002;15:41' -->
<A NAME="page_jc1764_1_4"> </A>
<!-- end of table folio -->
<TABLE WIDTH="52%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="BOTTOM">
<TD WIDTH="70%" VALIGN="TOP"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>EARL F. CHEIT</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Earl&nbsp;F. Cheit<BR>
Director</FONT></TD>
<TD WIDTH="4%" VALIGN="TOP"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="26%" ALIGN="CENTER" VALIGN="TOP"><FONT SIZE=2><BR>
July 29, 2002</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="70%" VALIGN="TOP"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>STEPHEN B. LAMSON</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Stephen&nbsp;B. Lamson<BR>
Director</FONT></TD>
<TD WIDTH="4%" VALIGN="TOP"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="26%" ALIGN="CENTER" VALIGN="TOP"><FONT SIZE=2><BR>
July 29, 2002</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="70%" VALIGN="TOP"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>PETER N. LOURAS, JR.</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Peter&nbsp;N. Louras, Jr.<BR>
Director</FONT></TD>
<TD WIDTH="4%" VALIGN="TOP"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="26%" ALIGN="CENTER" VALIGN="TOP"><FONT SIZE=2><BR>
July 29, 2002</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="70%" VALIGN="TOP"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>SUNNE WRIGHT MCPEAK</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Sunne Wright McPeak<BR>
Director</FONT></TD>
<TD WIDTH="4%" VALIGN="TOP"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="26%" ALIGN="CENTER" VALIGN="TOP"><FONT SIZE=2><BR>
July 29, 2002</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="70%" VALIGN="TOP"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>BARRY LAWSON WILLIAMS</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Barry Lawson Williams<BR>
Director</FONT></TD>
<TD WIDTH="4%" VALIGN="TOP"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="26%" ALIGN="CENTER" VALIGN="TOP"><FONT SIZE=2><BR>
July 29, 2002</FONT></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->

<P ALIGN="CENTER"><FONT SIZE=2>4</FONT></P>

<HR NOSHADE>
<!-- ZEQ.=2,SEQ=4,EFW="2085305",CP="SIMPSON MANUFACTURING CO.",DN="1",CHK=653701,FOLIO='4',FILE='DISK038:[02SFO4.02SFO1764]JC1764A.;5',USER='CSTCLAI',CD='29-JUL-2002;15:41' -->
<!-- THIS IS THE END OF A COMPOSITION COMPONENT -->
<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="page_ka1764_1_5"> </A> </FONT></P>

<!-- TOC_END -->
<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="ka1764_index_to_exhibits"> </A>
<A NAME="toc_ka1764_1"> </A>
<BR></FONT><FONT SIZE=2><B>INDEX TO EXHIBITS    <BR>  </B></FONT></P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="BOTTOM">
<TH WIDTH="9%" ALIGN="CENTER"><FONT SIZE=1><B>Exhibit<BR>
Number</B></FONT><HR NOSHADE></TH>
<TH WIDTH="2%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="69%" ALIGN="CENTER"><FONT SIZE=1><B>Description</B></FONT><HR NOSHADE></TH>
<TH WIDTH="2%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="17%" ALIGN="CENTER"><FONT SIZE=1><B>Sequentially<BR>
Numbered Page</B></FONT><HR NOSHADE></TH>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="9%" ALIGN="CENTER"><FONT SIZE=2>&nbsp;&nbsp;4.1</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="69%"><FONT SIZE=2>1994 Stock Option Plan, as amended through July&nbsp;29, 2002</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="CENTER"><FONT SIZE=2>&nbsp;&nbsp;6</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="9%" ALIGN="CENTER"><FONT SIZE=2><BR>
&nbsp;&nbsp;5.1</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="69%"><FONT SIZE=2><BR>
Opinion of Shartsis, Friese&nbsp;&amp; Ginsburg LLP as to the legality of the securities being registered</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="CENTER"><FONT SIZE=2><BR>
14</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="9%" ALIGN="CENTER"><FONT SIZE=2><BR>
23.1</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="69%"><FONT SIZE=2><BR>
Consent of PricewaterhouseCoopers LLP</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="CENTER"><FONT SIZE=2><BR>
15</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="9%" ALIGN="CENTER"><FONT SIZE=2><BR>
23.2</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="69%"><FONT SIZE=2><BR>
Consent of Shartsis, Friese &amp; Ginsburg LLP (contained in Exhibit&nbsp;5.1)</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="CENTER"><FONT SIZE=2><BR>
14</FONT></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->

<P ALIGN="CENTER"><FONT SIZE=2>5</FONT></P>

<HR NOSHADE>
<!-- ZEQ.=1,SEQ=5,EFW="2085305",CP="SIMPSON MANUFACTURING CO.",DN="1",CHK=804306,FOLIO='5',FILE='DISK038:[02SFO4.02SFO1764]KA1764A.;4',USER='CSTCLAI',CD='29-JUL-2002;15:35' -->
<!-- THIS IS THE END OF A COMPOSITION COMPONENT -->
<BR>
<P><br><A NAME="02SFO1764_1">QuickLinks</A><br></P><!-- TOC_BEGIN -->
<FONT SIZE=2><A HREF="#toc_jc1764_1">SIGNATURES</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_jc1764_2">POWER OF ATTORNEY</A></FONT><BR>
<!-- TOC_BEGIN -->
<FONT SIZE=2><A HREF="#toc_ka1764_1">INDEX TO EXHIBITS</A></FONT><BR>
<!-- SEQ=,FILE='QUICKLINK',USER=ATOBAK,SEQ=,EFW="2085305",CP="SIMPSON MANUFACTURING CO.",DN="1" -->
<!-- TOCEXISTFLAG -->
</BODY>
</HTML>

</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-4.1
<SEQUENCE>3
<FILENAME>a2085305zex-4_1.htm
<DESCRIPTION>EXHIBIT 4.1
<TEXT>
<HTML>
<HEAD>
<TITLE>
</TITLE>
</HEAD>
<BODY BGCOLOR="#FFFFFF" LINK=BLUE  VLINK=PURPLE>
<BR>
<FONT SIZE=3 ><A HREF="#02SFO1764_2">QuickLinks</A></FONT>
<font size=3> -- Click here to rapidly navigate through this document</font>
<P ALIGN="RIGHT"><FONT SIZE=2><A
NAME="page_kg1764_1_6"> </A> </FONT></P>

<!-- TOC_END -->
<P ALIGN="RIGHT"><FONT SIZE=2><B>Exhibit 4.1  </B></FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="kg1764_simpson_manufacturing_co.,_inc__sim03447"> </A>
<A NAME="toc_kg1764_1"> </A>
<BR></FONT><FONT SIZE=2><B>SIMPSON MANUFACTURING CO.,&nbsp;INC.<BR>  <BR>    1994 STOCK OPTION PLAN<BR>  <BR>    Adopted February&nbsp;23, 1994<BR>  and Amended through July&nbsp;29, 2002    <BR>  </B></FONT></P>

<P><FONT SIZE=2><B>1.&nbsp;&nbsp;&nbsp;&nbsp;PURPOSES.  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)&nbsp;&nbsp;The
purpose of the Plan is to provide a means by which selected Employees and Directors of and Consultants to the Company, and its Affiliates, may be given an
opportunity to purchase stock of the Company. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)&nbsp;&nbsp;The
Company, by means of the Plan, seeks to retain the services of persons who are now Employees or Directors of or Consultants to the Company and its Affiliates, to
secure and retain the services of new Employees, Directors and Consultants, and to provide incentives for such persons to exert maximum efforts for the success of the Company and its Affiliates. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c)&nbsp;&nbsp;The
Company intends that the Options issued under the Plan shall, in the discretion of the Board or any Committee to which responsibility for administration of the Plan
has been delegated pursuant to subsection 3(c), be either Incentive Stock Options or Nonstatutory Stock Options. All Options shall be
separately designated Incentive Stock Options or Nonstatutory Stock Options at the time of grant, and in such form as issued pursuant to section&nbsp;6, and a separate certificate or certificates
will be issued for shares purchased on exercise of each type of Option. </FONT></P>

<P><FONT SIZE=2><B>2.&nbsp;&nbsp;&nbsp;&nbsp;DEFINITIONS.  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)&nbsp;&nbsp;</FONT><FONT
SIZE=2><B>"Affiliate" </B></FONT><FONT SIZE=2>means any parent corporation or subsidiary corporation of the Company, whether now or hereafter existing, as
those terms are defined in sections&nbsp;424(e) and (f), respectively, of the Code. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)&nbsp;&nbsp;</FONT><FONT
SIZE=2><B>"Board" </B></FONT><FONT SIZE=2>means the Board of Directors of the Company. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c)&nbsp;&nbsp;</FONT><FONT
SIZE=2><B>"Code" </B></FONT><FONT SIZE=2>means the Internal Revenue Code of 1986, as amended. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d)&nbsp;&nbsp;</FONT><FONT
SIZE=2><B>"Committee" </B></FONT><FONT SIZE=2>means a Committee appointed by the Board in accordance with subsection 3(c) of the Plan. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(e)&nbsp;&nbsp;</FONT><FONT
SIZE=2><B>"Common Stock" </B></FONT><FONT SIZE=2>means the common stock of the Company. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(f)&nbsp;&nbsp;&nbsp;&nbsp;</FONT><FONT
SIZE=2><B>"Company" </B></FONT><FONT SIZE=2>means Simpson Manufacturing Co.,&nbsp;Inc., a Delaware corporation. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(g)&nbsp;&nbsp;</FONT><FONT
SIZE=2><B>"Consultant" </B></FONT><FONT SIZE=2>means any person, including an advisor, engaged by the Company or an Affiliate to render consulting services
and who is compensated for such services; provided that the term "Consultant" shall not include Directors who are paid only a director's fee by the Company or who are not compensated by the Company
for their services as Directors. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(h)&nbsp;&nbsp;</FONT><FONT
SIZE=2><B>"Continuous Status as an Employee, Director or Consultant" </B></FONT><FONT SIZE=2>means the employment or relationship as a Director or
Consultant is not interrupted or terminated. The Board, in its sole discretion, may determine whether Continuous Status as an Employee, Director or Consultant shall be considered interrupted in the
case of: (i)&nbsp;any leave of absence approved by the Board, including sick leave, military leave or any other personal leave; or (ii)&nbsp;transfers between locations of the Company or between
the Company, Affiliates or their successors. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i)&nbsp;&nbsp;&nbsp;&nbsp;</FONT><FONT
SIZE=2><B>"Director" </B></FONT><FONT SIZE=2>means a member of the Board. </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>6</FONT></P>

<HR NOSHADE>
<!-- ZEQ.=1,SEQ=1,EFW="2085305",CP="SIMPSON MANUFACTURING CO.",DN="2",CHK=126044,FOLIO='6',FILE='DISK038:[02SFO4.02SFO1764]KG1764A.;2',USER='CSTCLAI',CD='29-JUL-2002;15:32' -->
<A NAME="page_kg1764_1_7"> </A>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(j)&nbsp;&nbsp;&nbsp;&nbsp;</FONT><FONT
SIZE=2><B>"Employee" </B></FONT><FONT SIZE=2>means any person, including Officers and Directors, employed by the Company or any Affiliate of the Company.
Neither service as a Consultant or a Director nor payment of a director's fee by the Company shall be sufficient to constitute "employment" by the Company. </FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(k)&nbsp;&nbsp;</FONT><FONT
SIZE=2><B>"Exchange Act" </B></FONT><FONT SIZE=2>means the Securities Exchange Act of 1934, as amended. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(l)&nbsp;&nbsp;&nbsp;&nbsp;</FONT><FONT
SIZE=2><B>"Fair Market Value" </B></FONT><FONT SIZE=2>means the value of the Common Stock as determined in good faith by the Board and in a manner
consistent with section&nbsp;260.140.50 of Chapter 3 of Title 10 of the California Code of Regulations. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(m)&nbsp;&nbsp;</FONT><FONT
SIZE=2><B>"Incentive Stock Option" </B></FONT><FONT SIZE=2>means an Option intended to qualify as an incentive stock option within the meaning of
section&nbsp;422 of the Code and the regulations promulgated thereunder. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(n)&nbsp;&nbsp;</FONT><FONT
SIZE=2><B>"Non-Employee Director" </B></FONT><FONT SIZE=2>means a Director who satisfies the requirements established from time to time by the
Securities and Exchange Commission for non-employee directors under Rule&nbsp;16b-3. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(o)&nbsp;&nbsp;</FONT><FONT
SIZE=2><B>"Nonstatutory Stock Option" </B></FONT><FONT SIZE=2>means an Option not intended to qualify as an Incentive Stock Option. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(p)&nbsp;&nbsp;</FONT><FONT
SIZE=2><B>"Officer" </B></FONT><FONT SIZE=2>means a person who is an officer of the Company within the meaning of section&nbsp;16 of the Exchange Act and
the rules and regulations promulgated thereunder. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(q)&nbsp;&nbsp;</FONT><FONT
SIZE=2><B>"Option" </B></FONT><FONT SIZE=2>means a stock option granted pursuant to the Plan. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(r)&nbsp;&nbsp;</FONT><FONT
SIZE=2><B>"Option Agreement" </B></FONT><FONT SIZE=2>means a written agreement between the Company and an Optionee evidencing the terms and conditions of
an individual Option grant. Each Option Agreement shall be subject to the terms and conditions of the Plan. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(s)&nbsp;&nbsp;</FONT><FONT
SIZE=2><B>"Optioned Stock" </B></FONT><FONT SIZE=2>means the Common Stock of the Company subject to an Option. </FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(t)&nbsp;&nbsp;&nbsp;&nbsp;</FONT><FONT
SIZE=2><B>"Optionee" </B></FONT><FONT SIZE=2>means an Employee, Director or Consultant who holds an outstanding Option. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(u)&nbsp;&nbsp;</FONT><FONT
SIZE=2><B>"Outside Director" </B></FONT><FONT SIZE=2>means a member of the Board who satisfies the requirements established from time to time for outside
directors under section&nbsp;162(m) of the Code. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(v)&nbsp;&nbsp;</FONT><FONT
SIZE=2><B>"Plan" </B></FONT><FONT SIZE=2>means this Simpson Manufacturing Co.,&nbsp;Inc. 1994 Stock Option Plan. </FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(w)&nbsp;&nbsp;</FONT><FONT
SIZE=2><B>"Rule&nbsp;16b-3" </B></FONT><FONT SIZE=2>means Rule&nbsp;16b-3 under the Exchange Act or any successor to
Rule&nbsp;16b-3, as in effect when discretion is being exercised with respect to the Plan. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(x)&nbsp;&nbsp;</FONT><FONT
SIZE=2><B>"Securities Act" </B></FONT><FONT SIZE=2>means the Securities Act of 1933, as amended. </FONT></P>


<P><FONT SIZE=2><B>3.&nbsp;&nbsp;&nbsp;&nbsp;ADMINISTRATION.  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)&nbsp;&nbsp;The
Plan shall be administered by the Board unless and until the Board delegates administration to a Committee, as provided in subsection 3(c). </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)&nbsp;&nbsp;The
Board shall have the power, subject to, and within the limitations of, the express provisions of the Plan: </FONT></P>

<UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1)&nbsp;&nbsp;To
determine from time to time which of the persons eligible under the Plan shall be granted Options; when and how each Option shall be granted; whether an Option will
be an Incentive Stock Option or a Nonstatutory Stock Option; the terms and conditions of each Option granted (which need not be identical), including the time or times such Option may be exercised as
a whole or in part; and the number of shares for which an Option shall be granted to each such person; </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2)&nbsp;&nbsp;To
grant Options under the Plan; </FONT></P>

</UL>
<P ALIGN="CENTER"><FONT SIZE=2>7</FONT></P>

<HR NOSHADE>
<!-- ZEQ.=2,SEQ=2,EFW="2085305",CP="SIMPSON MANUFACTURING CO.",DN="2",CHK=398879,FOLIO='7',FILE='DISK038:[02SFO4.02SFO1764]KG1764A.;2',USER='CSTCLAI',CD='29-JUL-2002;15:32' -->
<A NAME="page_kg1764_1_8"> </A>
<UL>
<BR>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3)&nbsp;&nbsp;To
construe and interpret the Plan and Options granted under it, and to establish, amend and revoke rules and regulations for its administration. The Board, in the
exercise of this power, may correct any defect, omission or inconsistency in the Plan or in any Option Agreement, in a manner and to the extent it shall deem necessary or expedient to make the Plan
fully effective; and </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(4)&nbsp;&nbsp;To
amend the Plan as provided in section&nbsp;11. </FONT></P>

</UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c)&nbsp;&nbsp;The
Board may delegate administration of the Plan to a Committee of the Board that will satisfy the requirements of Rule&nbsp;16b-3. The Committee shall
consist solely of two or more Directors, each of whom is a Non-Employee Director and an Outside Director, who shall be appointed by the Board. Subject to the foregoing, from time to time
the Board may increase the size of the Committee and appoint additional qualified members, remove members (with or without cause) and appoint new members in substitution therefor, or fill vacancies,
however caused. If administration is delegated to a Committee, the Committee shall have, in connection with the administration of the Plan, the powers theretofore possessed by the Board (and
references in this Plan to the Board shall thereafter be to the Committee), subject, however, to such resolutions, not inconsistent with the provisions of the Plan, as may be adopted from time to time
by the Board. The Board may abolish the Committee at any time and revest in the Board the administration of the Plan. Notwithstanding anything in this section&nbsp;3 to the contrary, the Board or
the Committee may delegate to a committee of one or more members of the Board the authority to grant options to eligible persons who are not then subject to section&nbsp;16 of the Exchange Act. </FONT></P>

<P><FONT SIZE=2><B>4.&nbsp;&nbsp;&nbsp;&nbsp;SHARES SUBJECT TO THE PLAN.  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)&nbsp;&nbsp;Subject
to the provisions of section&nbsp;10 relating to adjustments on changes in stock, the stock that may be sold pursuant to Options shall not exceed in the
aggregate 4,000,000 shares of the Common Stock. If any Option shall for any reason expire or otherwise terminate, as a whole or in part, without having been exercised in full, the stock not purchased
under such Option shall revert to and again become available for issuance under the Plan. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)&nbsp;&nbsp;The
stock subject to the Plan may be unissued shares or reacquired shares, bought on the market or otherwise. </FONT></P>

<P><FONT SIZE=2><B>5.&nbsp;&nbsp;&nbsp;&nbsp;ELIGIBILITY.  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)&nbsp;&nbsp;Incentive
Stock Options may be granted only to Employees. Nonstatutory Stock Options may be granted only to Employees, Directors or Consultants. </FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)&nbsp;&nbsp;No
person shall be eligible for the grant of an Option if, at the time of grant, such person owns (or is deemed to own pursuant to section&nbsp;424(d) of the Code)
stock possessing more than ten percent of the total combined voting power of all classes of stock of the Company or of any of its Affiliates unless the exercise price of such Option is at least
110&nbsp;percent of the Fair Market Value of such stock at the date of grant and the Option is not exercisable after the expiration of five years from the date of grant. </FONT></P>

<P><FONT SIZE=2><B>6.&nbsp;&nbsp;&nbsp;&nbsp;OPTION PROVISIONS.  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Each Option shall be in such form and shall contain such terms and conditions as the Board shall deem appropriate. The provisions of separate Options need not be
identical, but each Option shall include (through incorporation of provisions hereof by reference in the Option Agreement or </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>8</FONT></P>

<HR NOSHADE>
<!-- ZEQ.=3,SEQ=3,EFW="2085305",CP="SIMPSON MANUFACTURING CO.",DN="2",CHK=936883,FOLIO='8',FILE='DISK038:[02SFO4.02SFO1764]KG1764A.;2',USER='CSTCLAI',CD='29-JUL-2002;15:32' -->
<A NAME="page_kg1764_1_9"> </A>
<BR>

<P><FONT SIZE=2>
otherwise), except as the Board may otherwise determine in the specific case, the substance of each of the following provisions: </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Term of Options.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;No Option shall be exercisable after the expiration of ten years from the date it is
granted. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Price.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;The exercise price of each Incentive Stock Option shall be not less than 100&nbsp;percent of the
Fair Market Value of the stock subject to the Option on the date the Option is granted. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c)</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Consideration.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;The purchase price of stock acquired pursuant to an Option shall be paid, to the extent
permitted by applicable statutes and regulations, either (i)&nbsp;in cash at the time the Option is exercised, or (ii)&nbsp;in the absolute discretion of the Board or the Committee (which
discretion may be exercised in a particular case without regard to any other case or cases), at the time of the grant or thereafter, (A)&nbsp;by the withholding of shares of Common Stock issuable on
exercise of the Option or delivery to the Company of other Common Stock of the Company, (B)&nbsp;according to a deferred payment or other arrangement (which may include, without limiting the
generality of the foregoing, the use of other Common Stock of the Company) with the person to whom the Option is granted or to whom the
Option is transferred pursuant to subsection 6(d), or (C)&nbsp;in any other form of legal consideration that may be acceptable to the Board. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In
the case of any deferred payment arrangement, interest shall be payable at least annually and shall be charged at the minimum rate of interest necessary to avoid the treatment as
interest, under any applicable provisions of the Code, of any amounts other than amounts stated to be interest under the deferred payment arrangement, or if less, the maximum rate permitted by law. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d)</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Transferability.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;An Option shall not be sold, assigned, transferred, pledged, hypothecated or otherwise
disposed by the Optionee during his or her lifetime, whether by operation of law or otherwise, other than by will or the laws of descent and distribution applicable to such Optionee, or be made
subject to execution, attachment or similar process; provided that the Board may in its discretion at the time of approval of the grant of an Option or thereafter permit an Option to be transferred by
an Optionee to a trust or other entity established by the Optionee for estate planning purposes, and may permit further transferability, or impose conditions or limitations on any permitted
transferability. An Option shall otherwise be exercisable during the lifetime of the person to whom the Option is granted only by such person. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(e)</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Vesting.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;The total number of shares of stock subject to an Option may, but need not, be allotted in periodic
installments (which may, but need not, be equal). An Option Agreement may provide that from time to time during each of such installment periods, the Option may become exercisable ("vest") with
respect to some or all of the shares allotted to that period, and may be exercised with respect to some or all of the shares allotted to such period or any prior period as to which the Option shall
have become vested but shall not have been fully exercised. An Option may be subject to such other terms and conditions on the time or times when it may be exercised (which may be based on performance
or other criteria) as the Board may deem appropriate. The vesting provisions may vary among Options, but in each case will provide for vesting of at least twenty percent per year of the total number
of shares subject to the Option. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(f)</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Conditions On Exercise of Options and Issuance of Shares.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;</FONT></P>

<UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1)&nbsp;&nbsp;Shares
shall not be issued on exercise of an Option unless the exercise of such Option and the delivery of such Shares pursuant thereto shall comply with all applicable
laws and regulations, including, without limitation, the Securities Act, the Exchange Act, the rules and regulations promulgated thereunder and the requirements of any stock exchange on which the
Common Stock may then be listed, and shall be further subject to the approval of counsel for the Company with respect to such compliance. </FONT></P>

</UL>
<P ALIGN="CENTER"><FONT SIZE=2>9</FONT></P>

<HR NOSHADE>
<!-- ZEQ.=4,SEQ=4,EFW="2085305",CP="SIMPSON MANUFACTURING CO.",DN="2",CHK=914326,FOLIO='9',FILE='DISK038:[02SFO4.02SFO1764]KG1764A.;2',USER='CSTCLAI',CD='29-JUL-2002;15:32' -->
<A NAME="page_kg1764_1_10"> </A>
<UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2)&nbsp;&nbsp;The
Company may require any Optionee, or any person to whom an Option is transferred under subsection 6(d), as a condition of exercising an Option, (1)&nbsp;to give
written assurances satisfactory to the Company as to the Optionee's knowledge and experience in financial and business matters or to employ a purchaser representative reasonably satisfactory to the
Company who is knowledgeable and experienced in financial and business matters, and that he or she is capable of evaluating, alone or together with the purchaser representative, the merits and risks
of exercising the Option; and (2)&nbsp;to give written assurances satisfactory to the Company stating that such person is acquiring the stock subject to the Option for such person's own account and
not with any present intention of selling or otherwise distributing the stock. The foregoing requirements, and any assurances given pursuant to such requirements, shall be inapplicable if
(i)&nbsp;the issuance of the shares on the exercise of the Option has been registered under a then currently effective registration statement under the Securities Act, or (ii)&nbsp;as to any
particular requirement, a determination is made by counsel for the Company that such requirement need not be met in the circumstances under the then applicable securities laws. The Company may, with
advice of its counsel, place such legends on stock certificates issued under the Plan as the Company deems necessary or appropriate to comply with applicable securities laws, including, but not
limited to, legends restricting the transfer of the stock. </FONT></P>

</UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(g)</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Termination of Employment or Relationship as a Director or Consultant.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;If an Optionee's Continuous Status as
an Employee, Director or Consultant terminates (other than on the Optionee's death or disability), the Optionee may exercise his or her Option (to the extent that the Optionee shall have been entitled
to exercise it at the date of termination) but only within the period ending on the earlier of (i)&nbsp;the ninetieth day after the termination of the Optionee's Continuous Status as an Employee,
Director or Consultant (or such longer or shorter period, which in no event shall be less than thirty days, specified in the Option Agreement), or (ii)&nbsp;the expiration of the term of the Option
as set forth in the Option Agreement. If, after termination, the Optionee does not exercise his or her Option within the time specified in the Option Agreement, the Option shall terminate, and the
shares covered by such Option shall revert to and again become available for issuance under the Plan. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(h)</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Disability of Optionee.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;If an Optionee's Continuous Status as an Employee, Director or Consultant terminates
as a result of the Optionee's disability, the Optionee may exercise his or her Option (to the extent that the Optionee shall have been entitled to exercise it at the date of termination), but only
within the period ending on the earlier of (i)&nbsp;the first anniversary of such termination (or such longer or shorter period, which in no event shall be less than six months, specified in the
Option Agreement), or (ii)&nbsp;the expiration of the term of the Option as set forth in the Option Agreement. If, at the date of termination, the Optionee is not entitled to exercise his or her
entire Option, the shares covered by the unexercisable portion of the Option shall revert to and again become available for issuance under the Plan. If, after termination, the Optionee does not
exercise his or her Option within the time specified herein, the Option shall terminate, and the shares covered by such Option shall revert to and again become available for issuance under the Plan. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i)</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Death of Optionee.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;If of an Optionee dies during, or within a period specified in the Option after the
termination of, the Optionee's Continuous Status as an Employee, Director or Consultant, the Option may be exercised (to the extent that the Optionee shall have been entitled to exercise the Option at
the date of death) by the Optionee's estate or by a person who shall have acquired the right to exercise the Option by bequest or inheritance, but only within the period ending on the earlier of
(i)&nbsp;the one hundred eightieth day after the first anniversary of the date of death (or such longer or shorter period, which in no event shall be less than six months, specified in the Option
Agreement), or (ii)&nbsp;the expiration of the term of such Option as set forth in the Option Agreement. If, at the time of death,
the Optionee is not entitled to exercise his or her entire Option, the shares covered by the unexercisable portion of the Option shall revert to and again become available for issuance under the Plan.
If, after death, the Optionee's estate or a person who shall have acquired the right to exercise the </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>10</FONT></P>

<HR NOSHADE>
<!-- ZEQ.=5,SEQ=5,EFW="2085305",CP="SIMPSON MANUFACTURING CO.",DN="2",CHK=176732,FOLIO='10',FILE='DISK038:[02SFO4.02SFO1764]KG1764A.;2',USER='CSTCLAI',CD='29-JUL-2002;15:32' -->
<A NAME="page_kg1764_1_11"> </A>
<BR>

<P><FONT SIZE=2>
Option by bequest or inheritance does not exercise the Option within the time specified herein, the Option shall terminate, and the shares covered by such Option shall revert to and again become
available for issuance under the Plan. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(j)</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Exemptions.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;Notwithstanding subsections (g), (h)&nbsp;and (i)&nbsp;above, the Board shall have the
authority to extend the expiration date of any outstanding Option in circumstances in which it deems such action to be appropriate (provided that no such extension shall extend the term of an Option
beyond the date of expiration of the term of such Option as set forth in the Option Agreement). </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(k)</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Early Exercise.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;The Option may, but need not, include a provision whereby the Optionee may elect at any time
while an Employee, Director or Consultant to exercise the Option as to any part or all of the shares subject to the Option prior to the full vesting of the Option. Any unvested shares so purchased
shall be subject to a repurchase right in favor of the Company, with the repurchase price to be equal to the original purchase price of the stock, or to any other restriction the Board determines to
be appropriate; provided that the right to repurchase at the original purchase price shall lapse at a minimum rate of twenty percent per year over five years from the date the Option is granted and
such right shall be exercised within ninety days of termination of employment for cash or cancellation of purchase money indebtedness for the shares. Should the right of repurchase be assigned by the
Company, the assignee shall pay the Company cash equal to the difference between the original purchase price and the stock's Fair Market Value if the original purchase price is less than the stock's
Fair Market Value. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(l)</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Withholding.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;To the extent approved by the Board in the specific case, at the time of approval of the grant
of the Option or thereafter, the Optionee may satisfy any Federal, state or local tax withholding obligation relating to the exercise of such Option by any of the following means or by a combination
of such means: (l)&nbsp;tendering a cash payment; (2)&nbsp;authorizing the Company to withhold shares from the shares of the Common Stock otherwise issuable to the Optionee as a result of the
exercise of the Option; or (3)&nbsp;delivering to the Company owned and unencumbered shares of the Common Stock of the Company. The value of shares withheld or delivered shall equal the Fair Market
Value of the shares on the day the Option is exercised. </FONT></P>

<P><FONT SIZE=2><B>7.&nbsp;&nbsp;&nbsp;&nbsp;COVENANTS OF THE COMPANY.  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)&nbsp;&nbsp;During
the terms of the Options, the Company shall keep available at all times the number of shares of Common Stock required to satisfy such Options. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)&nbsp;&nbsp;The
Company shall seek to obtain from each regulatory commission or agency having jurisdiction over the Plan such authority as may be required to issue and sell shares
of stock on exercise of the Options; provided that this undertaking shall not require the Company to register under the Securities Act either the Plan, any Option or any stock issued or issuable
pursuant to any such Option. If, after reasonable efforts, the Company is unable to obtain from any such regulatory commission or agency the authority that counsel for the Company deems necessary for
the lawful issuance and sale of stock under the Plan, the Company shall be relieved from any liability for failure to issue and sell stock on exercise of such Options unless and until such authority
is obtained. </FONT></P>


<P><FONT SIZE=2><B>8.&nbsp;&nbsp;&nbsp;&nbsp;USE OF PROCEEDS FROM STOCK.  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Proceeds from the sale of stock pursuant to Options shall constitute general funds of the Company. </FONT></P>

<P><FONT SIZE=2><B>9.&nbsp;&nbsp;&nbsp;&nbsp;MISCELLANEOUS.  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)&nbsp;&nbsp;Neither
an Optionee nor any person to whom an Option is transferred under subsection 6(d) shall be deemed to be the holder of, or to have any of the rights of a holder
with respect to, any shares </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>11</FONT></P>

<HR NOSHADE>
<!-- ZEQ.=6,SEQ=6,EFW="2085305",CP="SIMPSON MANUFACTURING CO.",DN="2",CHK=724706,FOLIO='11',FILE='DISK038:[02SFO4.02SFO1764]KG1764A.;2',USER='CSTCLAI',CD='29-JUL-2002;15:32' -->
<A NAME="page_kg1764_1_12"> </A>

<P><FONT SIZE=2>
subject to such Option unless and until such person has satisfied all requirements for exercise of the Option pursuant to its terms. No adjustment will be made for dividends or other rights for which
the record date is prior to the date of satisfaction of all such requirements. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)&nbsp;&nbsp;Throughout
the term of any Option, the Company shall deliver to the holder of such Option, not later than 120&nbsp;days after the close of each of the Company's fiscal
years during the Option term, a balance sheet and an income statement. This section shall not apply when issuance is limited to key employees whose duties in connection with the Company assure them
access to equivalent information. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c)&nbsp;&nbsp;Nothing
in the Plan or any instrument executed or Option granted or other action taken pursuant thereto shall confer on any Employee, Director, Consultant or Optionee
any right to continue in the employ of the Company or any Affiliate (or to continue acting as a Director or Consultant) or shall affect the right of the Company or any Affiliate to terminate the
employment or relationship as a Director or Consultant of any Employee, Director, Consultant or Optionee with or without cause. </FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d)&nbsp;&nbsp;To
the extent that the aggregate Fair Market Value (determined at the time of grant) of stock with respect to which Incentive Stock Options are exercisable for the first
time by any Optionee during any calendar year under all plans of the Company and its Affiliates exceeds $100,000, the Options or portions thereof in excess of such limit (according to the order in
which they are granted) shall be treated as Nonstatutory Stock Options. </FONT></P>

<P><FONT SIZE=2><B>10.&nbsp;&nbsp;&nbsp;&nbsp;ADJUSTMENTS ON CHANGES IN STOCK.  </B></FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)&nbsp;&nbsp;If
any change is made in the stock subject to the Plan, or subject to any Option (through merger, consolidation, reclassification, reorganization, recapitalization,
stock dividend, dividend in property other than cash, stock split or reverse stock split, liquidating dividend, combination of shares, exchange of shares, change in corporate structure or otherwise),
the Plan and outstanding Options will be appropriately adjusted by the Board in the class(es) and maximum number of shares subject to the Plan and the class(es) and number of shares and price per
share of stock subject to outstanding Options. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)&nbsp;&nbsp;In
the event of: (1)&nbsp;a merger or consolidation in which the Company is not the surviving corporation or (2)&nbsp;a reverse merger in which the Company is the
surviving corporation but the shares of the Common Stock outstanding immediately preceding the merger are converted by virtue of the merger into other property, whether in the form of securities, cash
or otherwise then to the extent permitted by applicable law: (i)&nbsp;any surviving corporation shall assume any Options outstanding under the Plan or shall substitute similar options for those
outstanding under the Plan, or (ii)&nbsp;such Options shall continue in full force and effect. If any surviving corporation refuses to assume or continue such Options, or to substitute similar
options for those outstanding under the Plan, then such Options shall be terminated if not exercised prior to such event. In the event of a dissolution or liquidation of the Company, any Options
outstanding under the Plan shall terminate if not exercised prior to such event. </FONT></P>

<P><FONT SIZE=2><B>11.&nbsp;&nbsp;&nbsp;&nbsp;AMENDMENT OF THE PLAN.  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)&nbsp;&nbsp;The
Board at any time or from time to time shall have the right to amend, modify, suspend or terminate the Plan for any reason; provided that the Company will seek
stockholder approval for any change if and to the extent required by applicable law, regulation or rule. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)&nbsp;&nbsp;It
is expressly contemplated that the Board may amend the Plan in any respect the Board deems necessary or advisable to provide Optionees with the maximum benefits
provided or to be provided under the Code and the regulations promulgated thereunder relating to Incentive Stock Options or to cause the Plan or Incentive Stock Options granted under it to comply
therewith. </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>12</FONT></P>

<HR NOSHADE>
<!-- ZEQ.=7,SEQ=7,EFW="2085305",CP="SIMPSON MANUFACTURING CO.",DN="2",CHK=115140,FOLIO='12',FILE='DISK038:[02SFO4.02SFO1764]KG1764A.;2',USER='CSTCLAI',CD='29-JUL-2002;15:32' -->
<A NAME="page_kg1764_1_13"> </A>
<BR>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c)&nbsp;&nbsp;Rights
and obligations under any Option granted before amendment of the Plan shall not be altered or impaired by any amendment of the Plan, unless (i)&nbsp;the Company
requests the consent of the person to whom the Option shall have been granted and (ii)&nbsp;such person consents in writing. </FONT></P>

<P><FONT SIZE=2><B>12.&nbsp;&nbsp;&nbsp;&nbsp;TERMINATION OR SUSPENSION OF THE PLAN.  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)&nbsp;&nbsp;The
Board may suspend or terminate the Plan at any time. Unless sooner terminated, the Plan shall terminate on May&nbsp;28, 2012. No Options may be granted under the
Plan while the Plan is suspended or after it is terminated. </FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)&nbsp;&nbsp;Rights
and obligations under any Option granted while the Plan is in effect shall not be altered or impaired by suspension or termination of the Plan, except with the
consent of the person to whom the Option shall have been granted. </FONT></P>

<P><FONT SIZE=2><B>13.&nbsp;&nbsp;&nbsp;&nbsp;EFFECTIVE DATE OF PLAN.  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Plan shall become effective as determined by the Board, but no Options granted under the Plan shall be exercised unless and until the Plan shall have been
approved by the shareholders of the Company, which approval shall be within twelve months before or after the date the Plan is adopted by the Board, and, if required, an appropriate permit shall have
been issued by the Commissioner of Corporations of the State of California. </FONT></P>

<P><FONT SIZE=2><B>14.&nbsp;&nbsp;&nbsp;&nbsp;COMPLIANCE WITH SECTION 16 OF THE EXCHANGE ACT.  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;It is the Company's intent that the Plan comply in all respects with Rule&nbsp;16b-3. If any provision of this Plan is found not to be in compliance
with Rule&nbsp;16b-3, that provision shall be deemed to have been amended or deleted as and to the extent necessary to comply with Rule&nbsp;16b-3, and the remaining
provisions of the Plan shall continue in full force and effect, without change. All transactions under the Plan shall be executed in accordance with the requirements of Section&nbsp;16 of the
Exchange Act and the applicable regulations promulgated thereunder. </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>13</FONT></P>

<HR NOSHADE>
<!-- ZEQ.=8,SEQ=8,EFW="2085305",CP="SIMPSON MANUFACTURING CO.",DN="2",CHK=723389,FOLIO='13',FILE='DISK038:[02SFO4.02SFO1764]KG1764A.;2',USER='CSTCLAI',CD='29-JUL-2002;15:32' -->
<BR>
<!-- THIS IS THE END OF A COMPOSITION COMPONENT -->
<BR>
<P><br><A NAME="02SFO1764_2">QuickLinks</A><br></P><!-- TOC_BEGIN -->
<FONT SIZE=2><A HREF="#toc_kg1764_1">SIMPSON MANUFACTURING CO., INC. 1994 STOCK OPTION PLAN Adopted February 23, 1994 and Amended through July 29, 2002</A></FONT><BR>
<!-- SEQ=,FILE='QUICKLINK',USER=ATOBAK,SEQ=,EFW="2085305",CP="SIMPSON MANUFACTURING CO.",DN="2" -->
<!-- TOCEXISTFLAG -->
</BODY>
</HTML>

</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>4
<FILENAME>a2085305zex-5_1.htm
<DESCRIPTION>EXHIBIT 5.1
<TEXT>
<HTML>
<HEAD>
<TITLE>
</TITLE>
</HEAD>
<BODY BGCOLOR="#FFFFFF" LINK=BLUE  VLINK=PURPLE>
<BR>
<P ALIGN="RIGHT"><FONT SIZE=2><A
NAME="page_ki1764_1_14"> </A> </FONT> <FONT SIZE=2><B>EXHIBIT 5.1  </B></FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;July&nbsp;29,
2002 </FONT></P>

<P><FONT SIZE=2>Simpson
Manufacturing Co.,&nbsp;Inc.<BR>
4120 Dublin Boulevard<BR>
Dublin, California 94568 </FONT></P>

<UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>Re:</FONT></DT><DD><FONT SIZE=2>Simpson
Manufacturing Co.,&nbsp;Inc. 1994 Stock<BR>
Option Plan, as amended through July&nbsp;29, 2002 </FONT></DD></DL>
</UL>

<P><FONT SIZE=2>Ladies
and Gentlemen: </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
are counsel for Simpson Manufacturing Co.,&nbsp;Inc., a Delaware corporation (the "Company"), in connection with its Registration Statement on Form&nbsp;S-8 under the
Securities Act of 1933, as amended (the "Registration Statement"), relating to 2,000,000 shares of the Company's Common Stock, with par value of $.01, offered or to be offered pursuant to the
Company's 1994 Stock Option Plan, as amended through July&nbsp;29, 2002 (the "Plan"). We are of the opinion that such shares being so registered for sale by the Company have been duly authorized
and, when sold and delivered as contemplated in such Registration Statement and in accordance with the Plan, will be validly issued, fully paid and non-assessable. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
hereby consent to the filing of this opinion with the Securities and Exchange Commission as an exhibit to such Registration Statement. </FONT></P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="47%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD COLSPAN=3><FONT SIZE=2><BR>
Very truly yours,<BR></FONT> <FONT SIZE=2>SHARTSIS, FRIESE&nbsp;&amp; GINSBURG LLP</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="47%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2><BR>
By</FONT></TD>
<TD WIDTH="1%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="45%"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DOUGLAS L. HAMMER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Douglas L. Hammer<BR></FONT>
</TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->

<P ALIGN="CENTER"><FONT SIZE=2>14</FONT></P>

<HR NOSHADE>
<!-- ZEQ.=1,SEQ=1,EFW="2085305",CP="SIMPSON MANUFACTURING CO.",DN="3",CHK=373668,FOLIO='14',FILE='DISK038:[02SFO4.02SFO1764]KI1764A.;7',USER='CSTCLAI',CD='29-JUL-2002;15:37' -->
<!-- THIS IS THE END OF A COMPOSITION COMPONENT -->
<BR>
<!-- SEQ=,FILE='QUICKLINK',USER=ATOBAK,SEQ=,EFW="2085305",CP="SIMPSON MANUFACTURING CO.",DN="3" -->
<!-- TOCEXISTFLAG -->
</BODY>
</HTML>

</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>5
<FILENAME>a2085305zex-23_1.htm
<DESCRIPTION>EXHIBIT 23.1
<TEXT>
<HTML>
<HEAD>
<TITLE>
</TITLE>
</HEAD>
<BODY BGCOLOR="#FFFFFF" LINK=BLUE  VLINK=PURPLE>
<BR>
<FONT SIZE=3 ><A HREF="#02SFO1764_4">QuickLinks</A></FONT>
<font size=3> -- Click here to rapidly navigate through this document</font>
<P ALIGN="RIGHT"><FONT SIZE=2><A
NAME="page_kk1764_1_15"> </A> </FONT></P>

<!-- TOC_END -->
<P ALIGN="RIGHT"><FONT SIZE=2><B>EXHIBIT 23.1  </B></FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="kk1764_consent_of_independent_accountants"> </A>
<A NAME="toc_kk1764_1"> </A>
<BR></FONT><FONT SIZE=2><B>CONSENT OF INDEPENDENT ACCOUNTANTS    <BR>  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We hereby consent to the incorporation by reference in this Registration Statement on Form&nbsp;S-8 of our report dated February&nbsp;4, 2002,
relating to the financial statements and financial statement schedules of Simpson Manufacturing Co.,&nbsp;Inc., which appears in Simpson Manufacturing Co.,&nbsp;Inc.'s Annual Report on
Form&nbsp;10-K for the year ended December&nbsp;31, 2001. </FONT></P>

<P><FONT SIZE=2>/s/
PRICEWATERHOUSECOOPERS LLP </FONT></P>


<P><FONT SIZE=2>San
Francisco, California<BR>
July&nbsp;23, 2002 </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>15</FONT></P>

<HR NOSHADE>
<!-- ZEQ.=1,SEQ=1,EFW="2085305",CP="SIMPSON MANUFACTURING CO.",DN="4",CHK=410211,FOLIO='15',FILE='DISK038:[02SFO4.02SFO1764]KK1764A.;4',USER='ATOBAK',CD='30-JUL-2002;11:48' -->
<!-- THIS IS THE END OF A COMPOSITION COMPONENT -->
<BR>
<P><br><A NAME="02SFO1764_4">QuickLinks</A><br></P><!-- TOC_BEGIN -->
<FONT SIZE=2><A HREF="#toc_kk1764_1">CONSENT OF INDEPENDENT ACCOUNTANTS</A></FONT><BR>
<!-- SEQ=,FILE='QUICKLINK',USER=ATOBAK,SEQ=,EFW="2085305",CP="SIMPSON MANUFACTURING CO.",DN="4" -->
<!-- TOCEXISTFLAG -->
</BODY>
</HTML>

</TEXT>
</DOCUMENT>
</SUBMISSION>
