<SEC-DOCUMENT>0000920371-18-000094.txt : 20180426
<SEC-HEADER>0000920371-18-000094.hdr.sgml : 20180426
<ACCEPTANCE-DATETIME>20180426192253
ACCESSION NUMBER:		0000920371-18-000094
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20180424
FILED AS OF DATE:		20180426
DATE AS OF CHANGE:		20180426

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Donaldson Philip E
		CENTRAL INDEX KEY:			0001737667

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-13429
		FILM NUMBER:		18780373

	MAIL ADDRESS:	
		STREET 1:		5956 W. LAS POSITAS BLVD.
		CITY:			PLEASANTON
		STATE:			CA
		ZIP:			94588

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SIMPSON MANUFACTURING CO INC /CA/
		CENTRAL INDEX KEY:			0000920371
		STANDARD INDUSTRIAL CLASSIFICATION:	CUTLERY, HANDTOOLS & GENERAL HARDWARE [3420]
		IRS NUMBER:				943196943
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		5956 W LAS POSITAS BLVD
		CITY:			PLEASANTON
		STATE:			CA
		ZIP:			94588
		BUSINESS PHONE:		9255609000

	MAIL ADDRESS:	
		STREET 1:		5956 W LAS POSITAS BLVD
		CITY:			PLEASANTON
		STATE:			CA
		ZIP:			94588
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>wf-form3_152478492213173.xml
<DESCRIPTION>FORM 3
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2018-04-24</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000920371</issuerCik>
        <issuerName>SIMPSON MANUFACTURING CO INC /CA/</issuerName>
        <issuerTradingSymbol>SSD</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001737667</rptOwnerCik>
            <rptOwnerName>Donaldson Philip E</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>5956 W LAS POSITAS BLVD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>PLEASANTON</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94588</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes></footnotes>

    <remarks>Attached to this Form 3 as Exhibit 24 is the reporting person's Power of Attorney.</remarks>

    <ownerSignature>
        <signatureName>/s/ Philip E Donaldson</signatureName>
        <signatureDate>2018-04-24</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>donaldsonsection13_16poapl.htm
<DESCRIPTION>POWER OF ATTORNEY: APRIL 24, 2018 PED
<TEXT>
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<pre>
POWER OF ATTORNEY RELATING TO
STATEMENTS ON SCHEDULE 13D OR 13G
AND REPORTS UNDER SECTION 16


The undersigned hereby constitutes and appoints each of Karen Colonias, Brian J. Magstadt and Kevin Swartzendruber, each acting individually, asthe undersigned'strue and lawful agent and attorney-in-fact, each with full power and authority for and on behalf of the undersigned to prepare or cause to be prepared, sign, file with the Securities and Exchange Commission and furnish to any other person all certificates, instruments, agreements and documents necessary to comply with section 13(d) and section 16 of the Securities Exchange Act of 1934, as amended (the "Act"),and the rules and regulations thereunder, in connection with securities of Simpson Manufacturing Co., Inc. and to do and perform every act properand convenientto be done incident to the exercise of foregoing power, as fully as the undersigned might or could do if personally present, it being understood that any certificate, instrument, agreement or document executed by any such attorney-in-fact on behalf of the undersigned pursuant to this power of attorney shall be in such form and shall contain such terms and conditions as such attorney-in-fact may approve in such person's discretion.

The undersigned acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at the request of the undersigned, are not assuming, nor is Simpson Manufacturing Co., Inc. assuming, any of the undersigned's responsibilities to comply with section 13 or section 16 of the Act.




    Date:    April 24, 2018




    By:    /s/Philip E. Donaldson
        Philip E. Donaldson
</pre>
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</SEC-DOCUMENT>
