X0303 4 2010-10-28 0 0000944480 GSE SYSTEMS INC GVP 0001018200 Feldman Jerome I GSE SYSTEMS, INC. 1332 LONDONTOWN BLVD. SYKESVILLE MD 21784 1 1 0 0 Chairman Common Stock 228858 D Common Stock 1341 I GP 401 (K) Retirement Plan Common Stock 354 I Held by members of Mr. Feldman's Family Employee Stock Option 3.40 2010-10-28 4 A 0 40000 0 A 2017-10-28 Common Stock 40000 40000 D Employee Stock Option 5.95 2018-10-23 Common Stock 100000 100000 D Employee Stock Option 1.61 2013-03-14 Common Stock 85000 85000 D Employee Stock Option 3.40 2017-10-28 Common Stock 10000 10000 I Held by member of Mr. Feldman's Family Employee Stock Option 1.85 2005-03-22 2012-03-22 Common Stock 2764 2764 I Held by member of Mr. Feldman's Family Employee Stock Option 1.61 2013-03-14 Common Stock 48000 48000 I Held by member of Mr. Feldman's Family Employee Stock Option 5.95 2018-10-23 Common Stock 25000 25000 I Held by member of Mr. Feldman's Family Exercisable as follows: 16,000 10/28/2011; 12,000 10/28/2012; 12,000 10/28/2013 Exercisable as follows: 14,285 10/23/2009; 14,286 10/23/2010; 14,286 10/23/2011; 14,285 10/23/2012; 14,286 10/23/2013; 14,286 10/23/2014; 14,286 10/23/2015 Exercisable as follows: 34,000 3/14/2007; 25,500 3/14/2008; 25,500 3/14/2009 Exercisable as follows: 4,000 10/28/2011; 3,000 10/28/2012; 3,000 10/28/2013 Exercisable as follows: 32,000 3/14/2007; 24,000 3/14/2008; 24,000 3/14/2009 Exercisable as follows: 3,571 10/23/2009; 3,571 10/23/2010; 3,572 10/23/2011; 3,571 10/23/2012; 3,572 10/23/2013; 3,571 10/23/2014; 3,572 10/23/2015 /s/ Jerome I Feldman 2011-04-29