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 Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * Mackenzie Jeffrey Eric   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) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Vice President (Last) (First) (Middle) 5956 W. LAS POSITAS BLVD. 3. Date of Earliest Transaction (Month/Day/Year) 08/18/2015 (Street) PLEASANTON, CA 94588 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction 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 (RSUs awarded Febuary 3, 2014) 08/18/2015   S   121 D $ 36.8348 969 (1) D   Common Stock (RSUs awarded February 6, 2013) 08/18/2015   S   3,607 D $ 36.8348 3,625 (2) D   Common Stock (RSUs awarded January 30, 2012) 08/18/2015   S   3,272 D $ 36.8348 1,669 (3) D   Common Stock (RSUs awarded February 2, 2015)               1,090 (4) D   Common Stock               4 D

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction 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 (Month/Day/Year)

7. Title and Amount of Underlying Securities (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

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Mackenzie Jeffrey Eric 5956 W. LAS POSITAS BLVD. PLEASANTON, CA 94588			Vice President

Signatures

/s/JEFFREY E. MACKENZIE		08/20/2015
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	Amount includes 969 shares of restricted stock units (RSUs) awarded on February 3, 2014. RSUs vest one fourth on each of the award date and the first, second and third anniversaries of the award date. The 969 shares are net of the number of shares expected to be withheld to cover the estimated income taxes due on vesting.
(2)	Amount includes 3,625 shares of restricted stock units (RSUs) awarded on February 6, 2013. RSUs vest one fourth on each of the award date and the first, second and third anniversaries of the award date. The 3,625 shares are net of the number of shares expected to be withheld to cover the estimated income taxes due on vesting.
(3)	Amount includes 1,669 shares of restricted stock units (RSUs) awarded on January 30, 2012. RSUs vested one fourth on each of the award date and the first, second and third anniversaries of the award date. Amount was increased by 111 shares to reflect the difference between the number of shares that was expected to be withheld to cover the estimated income taxes due on vesting (estimated on January 30, 2012, the date of the award) and the actual number of shares that was withheld on vesting of the RSUs.
(4)	Amount includes 1,090 shares of restricted stock units (RSUs) awarded on February 2, 2015. RSUs vest one fourth on each of the award date and the first, second and third anniversaries of the award date. The 1,090 shares are net of the number of shares expected to be withheld to cover the estimated income taxes due on vesting.

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