    <SEC-DOCUMENT>0001140361-21-009624-index.html : 20210323
    <SEC-HEADER>0001140361-21-009624.hdr.sgml : 20210323
    <ACCEPTANCE-DATETIME>20210323163454
    ACCESSION NUMBER:		0001140361-21-009624
    CONFORMED SUBMISSION TYPE:	DEFA14A
    PUBLIC DOCUMENT COUNT:		3
    FILED AS OF DATE:		20210323
    DATE AS OF CHANGE:		20210323

    FILER:

    	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

    	FILING VALUES:
    		FORM TYPE:		DEFA14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-13429
    		FILM NUMBER:		21765200

    	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>DEFA14A
    <SEQUENCE>1
    <FILENAME>nc10006522x2_defa14a.htm
    <DESCRIPTION>DEFA14A
    <TEXT>
    Document 1 - file: nc10006522x2_defa14a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>nc10006522x2_na01.jpg
    <TEXT>
    Document 2 - file: nc10006522x2_na01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>nc10006522x2_na02.jpg
    <TEXT>
    Document 3 - file: nc10006522x2_na02.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>