X0508 4/A 2025-11-21 2025-11-24 0 0001501585 HUNTINGTON INGALLS INDUSTRIES, INC. HII 0001569904 Kastner Christopher D 4101 WASHINGTON AVENUE NEWPORT NEWS VA 23607 1 1 0 0 Director, President & CEO 0 Common Stock 2263.818 D Common Stock 2025-11-21 5 G 0 E 660 0 D 67479.087 I Held in the Kastner Family Trust On November 24, 2025, the Form 4 filing for the reporting person incorrectly reported the nature of the transaction and the related direct and indirect holdings of common stock. As of November 21, 2025, the reporting person owned 2,263.818 shares of common stock and, following the reported transaction, 67,479.087 shares in the reporting person's family trust. /s/ Tiffany M. King, Attorney-in-Fact 2025-12-04