X0508 4 2024-10-23 0001049521 MERCURY SYSTEMS INC MRCY 0001699997 Plunkett Debora A 50 MINUTEMAN ROAD ANDOVER MA 01810 1 0 Common Stock 2024-10-23 4 A 0 4832 0 A 16171 D Represents deferred stock units (DSUs) that vest on the earlier of the first anniversary of the grant date and the next annual meeting of shareholders. Vested DSUs do not convert into shares of common stock until the date on which the reporting person ceases to be a member of our Board of Directors. /s/ Douglas Munro, attorney-in-fact 2024-10-25