X0306 4 2022-02-03 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 Common Stock 2022-02-03 4 A 0 64000 0.00 A 191743 D Represents 64,000 restricted stock units awarded to the Reporting Person under the Issuer's 2017 Equity Incentive Plan, as amended (the "Plan"), in connection with the Reporting Person's service as an executive officer of the Issuer, which restricted stock units are subject to vesting conditions. Includes 110,667 unvested restricted stock units held by the Reporting Person, all of which remain subject to certain vesting conditions. /s/ John Morrison 2022-02-07