X0609 4 2026-05-26 0001049521 MERCURY SYSTEMS INC MRCY 0001220679 LANCE HOWARD L false 50 MINUTEMAN ROAD ANDOVER MA 01810 1 0 Common Stock 2026-05-26 4 S 0 8000 99.9525 D 1250 I By The Howard L. Lance Revocable Living Trust Dated 9/1/2006 Common Stock 2026-05-26 4 S 0 1250 98.4992 D 0 I By The Howard L. Lance Revocable Living Trust Dated 9/1/2006 Common Stock 27272 D This transaction was executed in multiple trades at prices ranging from $99.3600 to $100.4501. The price reported above reflects the weighted average purchase price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. This transaction was executed in multiple trades at prices ranging from $98.1000 to $98.9000. The price reported above reflects the weighted average purchase price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. /s/ Douglas Munro, attorney-in-fact 2026-05-27