X0306 4 2017-03-01 0 0000890394 MoSys, Inc. MOSY 0001211275 RIORDAN THOMAS C/O PMC SIERRA 3975 FREEDOM CIRCLE SANTA CLARA CA 95054 0 1 0 0 Chief Operating Officer Common Stock 2017-03-01 4 M 0 3334 A 13109 D Common Stock 2017-03-01 4 F 0 1459 2.48 D 11650 D Represents the conversion upon vesting of restricted stock units (RSU) into common stock. RSU converts into common stock on a one-for-one basis. On July 22, 2016, the reporting person was granted 10,000 restricted stock units, which reflect the impact of a 1 for 10 reverse stock split of the Issuers Common Stock effected on 2/15/17. The restricted stock units vest in 3 equal installments on each of March 1, 2017, 2018, and 2019. /s/ C. Leitner by power of attny 2017-03-03