144 0001692554 XXXXXXXX LIVE 0001133421 Northrop Grumman Corporation 001-16411 2980 Fairview Park Drive Falls Church VA 22042 703-280-2900 Mark A. Welsh III Director Common Stock J.P. Morgan Securities LLC 270 Park Avenue, 10th Floor New York NY 10017 190 107947 142033476 05/04/2026 NYSE Common Stock 05/15/2025 RSU Vesting Issuer N 190 05/15/2025 Compensation Y The shares covered by this filing will be sold today or within three months from the date of this filing by Mark and Elizabeth Welsh. 05/04/2026 08/22/2025 /s/ J.P. Morgan Securities LLC as agent and attorney-in-fact for Mark A. Welsh III