X0306 4 2017-11-15 false 0001049521 MERCURY SYSTEMS INC MRCY 0001231657 ASLETT MARK 50 MINUTEMAN ROAD ANDOVER MA 01810 true true false false President and CEO Common Stock 2017-11-15 4 S false 4800.00 49.639 D 500182.00 D Common Stock 2017-11-16 4 S false 4800.00 50.576 D 495382.00 D Pursuant to a 10b5-1 stock trading plan established on August 8, 2017. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $49.50 to $49.96, inclusive. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $49.65 to $51.21, inclusive. /s/ Gerald M. Haines II, Attorney-in-Fact for ASLETT MARK 2017-11-17