X0306 4 2022-09-30 0 0000944480 GSE SYSTEMS INC GVP 0001665849 Pugh Daniel Warren 6940 COLUMBIA GATEWAY DRIVE SUITE 470 COLUMBIA MD 21046 0 1 0 0 Chief Legal & Risk Officer Common Stock 2022-09-30 4 F 0 1902 0.90 D 126108 D Shares withheld by the Issuer for payment of applicable taxes owed due to the vesting of 5,868 restricted share units pursuant to two restricted share unit agreements between the Reporting Person and the Issuer. /s/ Daniel Warren Pugh 2022-10-04