X0306 4 2015-11-23 0 0001583513 STG Group, Inc. GDEF 0001659644 Lee Simon S. 9131 SOUTHERN BREEZE DRIVE ORLANDO FL 32836 1 0 1 1 13(d) group member Common Stock 2015-11-23 4 J 0 8319080 A 8319080 I By: Simon S. Lee Management Trust Common Stock 2015-11-23 4 J 0 521039 A 521039 I By: JSL Descendants Trust Common Stock 2015-11-23 4 J 0 511733 A 511733 I By: Brian Lee Family Trust The securities were received in exchange for all equity interests owned in STG Group, Inc. upon the consummation of the transactions contemplated by the Stock Purchase Agreement, dated as of June 8, 2015, by and between Global Defense & National Security Systems, Inc., STG Group, Inc., the stockholders of STG Group, Inc. and the other parties thereto. The number of securities held includes the stock dividend paid on November 30, 2015 to holders of record on November 23, 2015. The securities are held indirectly by Simon S. Lee, as the trustee. The Simon S. Lee Management Trust has filed a Form 3, as a 10% holder. The securities are indirectly owned by Simon S. Lee. The reporting person disclaims beneficial ownership of these shares except to the extent of the reporting person's pecuniary interest in the shares. Simon S. Lee 2015-12-03