FORM 4
[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

CUSUMANO GARY M 		2. Issuer Name and Ticker or Trading Symbol

SIMPSON MANUFACTURING CO INC /CA/ [ SSD ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__ X __ Director                      _____ 10% Owner
_____ Officer (give title below)      _____ Other (specify below)
(Last)          (First)          (Middle)

5956 W. LAS POSITAS BLVD. 		3. Date of Earliest Transaction (MM/DD/YYYY)

4/24/2018
(Street)

PLEASANTON, CA 94588
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock (RSU awarded April 24, 2018)   4/24/2018     A    1475   A $55.34   1475   (1) D    
Common Stock (RSU awarded May 16, 2017)                  1438   (1) D    
Common Stock                  5000   D    
Common Stock (RSUs awarded April 20, 2016)                  1800   (1) D    
Common Stock (RSUs awarded April 21, 2015)                  1950   (1) D    
Common Stock (RSUs awarded February 2, 2015)                  1425   (2) D    
Common Stock (RSUs awarded February 3, 2014)                  1425   (2) D    
Common Stock (RSUs awarded February 6, 2013)                  1425   (2) D    
Common Stock (RSUs awarded January 30, 2012)                  1425   (2) D    
Common Stock                  800   I   Family Trust   (3)

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8) 		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4) 		8. Price of Derivative Security
(Instr. 5) 		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Explanation of Responses:
(1)  Restricted stock unit award vests 100% on the transaction date.
(2)  Restricted stock unit award vests one fourth on each of the transaction date and the first, second and third anniversaries of the transaction date.
(3)  The Shares are owned by Garry M. Cusumano and Diana L. Cusumano, trustees of the Cusumano Family Trust, U/A dated May 30, 2002.

Remarks:
Attached to this Form 4 as Exhibit 24 is the reporting person's Power of Attorney.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
CUSUMANO GARY M
5956 W. LAS POSITAS BLVD.
PLEASANTON, CA 94588 		X



Signatures
/s/GARY M. CUSUMANO 4/24/2018
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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