X0306 4 2019-10-23 false 0001049521 MERCURY SYSTEMS INC MRCY 0001671237 Nearhos Barry R 50 MINUTEMAN ROAD ANDOVER MA 01810 true false false false Common Stock 2019-10-23 4 A false 1961.00 0.00 A 6545.00 D These shares of restricted stock vest at 100% on the first anniversary of the grant date. /s/ Michelle McCarthy, Attorney-in-Fact for Barry R Nearhos 2019-10-25