<SEC-DOCUMENT>0000920371-20-000025.txt : 20200214
<SEC-HEADER>0000920371-20-000025.hdr.sgml : 20200214
<ACCEPTANCE-DATETIME>20200214165403
ACCESSION NUMBER:		0000920371-20-000025
CONFORMED SUBMISSION TYPE:	5
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20191231
FILED AS OF DATE:		20200214
DATE AS OF CHANGE:		20200214

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Swartzendruber Kevin Lee
		CENTRAL INDEX KEY:			0001732479

	FILING VALUES:
		FORM TYPE:		5
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-13429
		FILM NUMBER:		20621414

	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.
		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

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SIMPSON MANUFACTURING CO INC /CA/
		DATE OF NAME CHANGE:	19940315
</SEC-HEADER>
<DOCUMENT>
<TYPE>5
<SEQUENCE>1
<FILENAME>wf-form5_158171722605527.xml
<DESCRIPTION>FORM 5
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>5</documentType>

    <periodOfReport>2019-12-31</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <form3HoldingsReported>0</form3HoldingsReported>

    <form4TransactionsReported>0</form4TransactionsReported>

    <issuer>
        <issuerCik>0000920371</issuerCik>
        <issuerName>Simpson Manufacturing Co., Inc.</issuerName>
        <issuerTradingSymbol>SSD</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001732479</rptOwnerCik>
            <rptOwnerName>Swartzendruber Kevin Lee</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>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Senior VP of Finance</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1252</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Includes 1,252 unvested restricted stock units (RSUs) as follows: all 764 RSUs granted on February 15, 2019; and 488 of the 609 RSUs granted on February 15, 2018.</footnote>
        <footnote id="F2">Excludes all unvested performance-based share units (PSUs) that were previously reported. These PSUs have been removed as they have performance conditions other than stock price. The actual number of PSUs awarded will be reported upon vesting, once the performance period has ended and the performance criteria has been certified.</footnote>
    </footnotes>

    <remarks>Exhibit 24 - Power of Attorney</remarks>

    <ownerSignature>
        <signatureName>Cari Fisher, Attorney-in-Fact</signatureName>
        <signatureDate>2020-02-14</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>ex-24.txt
<DESCRIPTION>POA - SWARTZENDRUBER 12.9.2019
<TEXT>
POWER OF ATTORNEY RELATING TO
STATEMENTS ON SCHEDULE 13D OR 13G
AND REPORTS UNDER SECTION 16

The undersigned hereby constitutes and appoints each of Brian J. Magstadt,
Terry Hammons and Cari Fisher, each acting individually, as the undersigned's
true 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 proper and convenient to 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: December 9, 2019

By: /s/Kevin L. Swartzendruber
Kevin L. Swartzendruber
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
