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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1. Name and Address of Reporting Person * RIORDAN THOMAS   2. Issuer Name and Ticker or Trading Symbol MoSys, Inc. [MOSY] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Chief Operating Officer (Last) (First) (Middle) C/O PMC SIERRA, 3975 FREEDOM CIRCLE 3. Date of Earliest Transaction (Month/Day/Year) 08/23/2016 (Street) SANTA CLARA, CA 95054 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

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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

Option to purchase common stock

$ 6.06

08/23/2016

D

400,000

(1)

05/10/2017

Common Stock

400,000

(2)

0

D

Option to purchase common stock

$ 2.99

08/23/2016

D

400,000

(3)

12/21/2017

Common stock

400,000

(2)

0

D

Option to purchase common stock

$ 0.72

08/23/2016

D

457,142

(4)

08/23/2026

Common Stock

457,142

(2)

457,142

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
RIORDAN THOMAS C/O PMC SIERRA 3975 FREEDOM CIRCLE SANTA CLARA, CA 95054			Chief Operating Officer

Signatures

/s/ C. Leitner by power of attorney		08/25/2016
**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)	The canceled option provided for vesting as follows: 25% of the shares subject to the option on May 9, 2012 and as to 2.083% of the shares subject to the option on the 23rd day of each calendar month thereafter
(2)	On August 23, 2016, the Issuer canceled, pursuant to an option exchange program, options granted to the Reporting Person on 5/10/11 and 12/21/11. In exchange for these options to cumulatively purchase 800,000 shares, the Reporting Person received a new option to purchase 457,142 shares at a lower exercise price.
(3)	The canceled option provided for vesting as follows: 25% of the shares subject to the option on December 21, 2012 and as to 2.083% of the shares subject to the option on the 21st day of each calendar month thereafter
(4)	Option granted to replace cancelled options, pursuant to an option exchange program; vests ratably over 36 months.

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