Sec Form 4 Filing - DOMENIK STEPHEN L @ MoSys, Inc. - 2017-10-13

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 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 DOMENIK STEPHEN L 2. Issuer Name and Ticker or Trading Symbol MoSys, Inc. [ MOSY] 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) C/O SEVIN ROSEN FUNDS, 13455 NOEL RD #1670 3. Date of Earliest Transaction (MM/DD/YY) 10/13/2017 (Street) DALLAS, TX75240 4. If Amendment, Date Original Filed (MM/DD/YY) 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 (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 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 $ 5.3 10/13/2017 J 4,000 ( 1 ) 07/22/2022 Common Stock 4,000 ( 1 ) 0 D Option to purchase common stock $ 17 10/13/2017 J 4,000 ( 2 ) 07/16/2021 Common Stock 4,000 ( 2 ) 0 D Option to purchase common stock $ 31 10/13/2017 J 4,000 ( 3 ) 07/18/2020 Common Stock 4,000 ( 3 ) 0 D Option to purchase common stock $ 41.9 10/13/2017 J 4,000 ( 4 ) 07/18/2019 Common Stock 4,000 ( 4 ) 0 D Option to purchase common stock $ 30.9 10/13/2017 J 12,000 ( 5 ) 07/19/2018 Common Stock 12,000 ( 5 ) 0 D Option to purchase common stock $ 30.9 10/13/2017 J 2,000 ( 6 ) 07/19/2018 Common Stock 2,000 ( 6 ) 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other DOMENIK STEPHEN L C/O SEVIN ROSEN FUNDS 13455 NOEL RD #1670 DALLAS, TX75240 X Signatures C.Leitner by power of attny 10/16/2017 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On October 13, 2017, the reporting person and the Company agreed to cancel a stock option granted on July 22, 2016 to purchase 4,000 shares of common stock. The option was previously reported on a Form 4 filed with the SEC on July 26, 2016. The canceled option was exercisable in full as of July 22, 2017 . Shares and price have been adjusted for to reflect 1-for-10 reverse stock split effected in February 2017. ( 2 )On October 13, 2017, the reporting person and the Company agreed to cancel a stock option granted on July 16, 2015 to purchase 4,000 shares of common stock. The option was previously reported on a Form 4 filed with the SEC on July 20, 2015. The canceled option was exercisable in full as of July 16, 2016. Shares and price have been adjusted for to reflect 1-for-10 reverse stock split effected in February 2017. ( 3 )On October 13, 2017, the reporting person and the Company agreed to cancel a stock option granted on July 18, 2014 to purchase 4,000 shares of common stock. The option was previously reported on a Form 4 filed with the SEC on July 22, 2014. The canceled option was exercisable in full as of July 18, 2015 . Shares and price have been adjusted for to reflect 1-for-10 reverse stock split effected in February 2017. ( 4 )On October 13, 2017, the reporting person and the Company agreed to cancel a stock option granted on July 18, 2013 to purchase 4,000 shares of common stock. The option was previously reported on a Form 4 filed with the SEC July 19, 2013. The canceled option was exercisable in full as of July 18, 2014 . Shares and price have been adjusted for to reflect 1-for-10 reverse stock split effected in February 2017. ( 5 )On October 13, 2017, the reporting person and the Company agreed to cancel a stock option granted on July 19, 2012 to purchase 12,000 shares of common stock. The option was previously reported on a Form 4 filed with the SEC on July 20, 2012. The canceled option was exercisable in full as of July 19, 2013. Shares and price have been adjusted for to reflect 1-for-10 reverse stock split effected in February 2017. ( 6 )On October 13, 2017, the reporting person and the Company agreed to cancel a stock option granted on July 19, 2012 to purchase 2,000 shares of common stock. The option was previously reported on a Form 4 filed with the SEC on July 20, 2012. The canceled option was exercisable in full as of July 19, 2013 . Shares and price have been adjusted for to reflect 1-for-10 reverse stock split effected in February 2017.

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