X0306 4 2018-03-31 0 0000944480 GSE SYSTEMS INC GVP 0001649892 Loudermilk Kyle Justin GSE SYSTEMS, INC 1332 LONDONTOWN BLVD SYKESVILLE MD 21784 1 1 0 0 Chief Executive Officer & Pres Common Stock 2018-03-31 4 F 0 9985 3.25 D 510272 D Shares withheld by the Issuer for payment of applicable taxes owed due to the vesting of 20,460 restricted share units pursuant to two restricted share unit agreements between the Reporting Person and the issuer. /s/ Kyle Justin Loudermilk 2018-04-02