X0306 4 2019-04-11 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 2019-04-11 4 M 0 8334 A 25088 D Common Stock 2019-04-11 4 F 0 4100 2.51 D 20988 D Common Stock 2019-04-11 4 M 0 8334 A 29322 D Common Stock 2019-04-11 4 F 0 4100 2.51 D 25222 D Restricted Stock Units 2019-04-11 4 M 0 8334 0.00 A Common Stock 8334 24999 D Restricted Stock Units 2019-04-11 4 M 0 8334 0.00 A Common Stock 8334 24999 D Restricted stock units convert into common stock on a one-for-one basis. On April 11, 2018, the reporting person was granted 50,000 restricted stock units, vesting as follows: prior to the Initial Vesting Date, the Vested Ratio shall be zero. On the Initial Vesting Date, the Vested Ratio shall be 1/3, provided the Grantee's service has not been terminated prior to the Initial Vesting Date. For each quarter of Grantee service from the Initial Vesting Date until the Vested Ratio equals 1/1, the Vested Ratio shall be increased by 1/12. This Restricted Stock Unit will be fully vested after three (3) years of service. The Initial Vesting Date shall be September 1, 2017 to coincide with Grantee's date of hire. On July 2, 2018, the reporting person was granted 50,000 restricted stock units, vesting as follows: prior to the Initial Vesting Date, the Vested Ratio shall be zero. On the Initial Vesting Date, the Vested Ratio shall be 1/3, provided the Grantee's service has not been terminated prior to the Initial Vesting Date. For each quarter of Grantee service from the Initial Vesting Date until the Vested Ratio equals 1/1, the Vested Ratio shall be increased by 1/12. This Restricted Stock Unit will be fully vested after three (3) years of service. The Initial Vesting Date shall be September 1, 2017 to coincide with Grantee's date of hire. /s/ John W. Morrison, Jr. 2019-04-15