X0306 4 2019-02-13 0 0001394056 ONE STOP SYSTEMS, INC. OSS 0001729697 Morrison John W Jr. 2235 ENTERPRISE STREET #110 ESCONDIDO CA 92029 0 1 0 0 Chief Financial Officer Restricted Stock Unit 2019-02-13 4 A 0 15000 0.00 A Common Stock 15000 15000 D Each Restricted Stock Unit represents a contingent right to receive one share of OSS common stock. The closing price of OSS on February 13, 2019 was $2.43. Prior to the Initial Vesting Date, the Vested Ratio shall be zero. On the Initial Vesting Date, the Vested Ratio shall be 1/6, provided the Grantee's service has not been terminated prior to the Initial Vesting Date. For each six month period of Grantee service from the Initial Vesting Date until the Vested Ratio equals 1/1, the Vested Ratio shall be increased by 1/6. This Restricted Stock Unit will be fully vested after three (3) years of service. The Initial Vesting Date shall be six months following the Date of Restricted Stock Unit Grant. /s/John W. Morrison, Jr. 2019-03-21