X0407 4 2023-06-05 0 0001394056 ONE STOP SYSTEMS, INC. OSS 0001755059 KNOWLES MICHAEL 2235 ENTERPRISE STREET, SUITE 110 ESCONDIDO CA 92029 0 1 0 0 Chief Executive Officer 0 Common Stock 2023-06-05 4 A 0 400000 0.00 A 400000 D Stock Option (right to buy) 2.94 2023-06-05 4 A 0 400000 0.00 A 2033-06-04 Common Stock 400000 400000 D Represents 400,000 restricted stock units granted to the Reporting Person outside of the Issuer's 2017 Equity Incentive Plan, as amended (the "Plan"), in connection with, and as a material inducement to, the hiring and appointment of the Reporting Person as President and Chief Executive Officer of the Issuer, which restricted stock units are subject to vesting conditions. Consists of 400,000 unvested restricted stock units held by the Reporting Person, all of which remain subject to certain vesting conditions. Represents non-qualified stock options to purchase 400,000 shares of of the Issuer's common stock, which stock options were granted to the Reporting Person outside of the Issuer's Plan, in connection with, and as a material inducement to, the hiring and appointment of the Reporting Person as President and Chief Executive Officer of the Issuer. The stock options vest shall vest over four years, with one fourth vesting on the one-year anniversary of the date of grant and the remaining stock options vesting in six equal installments, commencing six months after the one-year anniversary of the grant date and every six months thereafter until fully vested. /s/ Michael Knowles 2023-06-06