X0508 4 2023-09-08 0 0001501585 HUNTINGTON INGALLS INDUSTRIES, INC. HII 0001948701 Borkey Todd A. C/O HUNTINGTON INGALLS INDUSTRIES, INC. 4101 WASHINGTON AVE. NEWPORT NEWS VA 23607 0 1 0 0 Ex VP & Chief Technology Offic 0 Common Stock 2023-09-08 4 A 0 41.81 210.84 A 5434.734 D Common Stock 2023-09-11 4 F 0 10.098 210.84 D 5424.636 D Huntington Ingalls Industries, Inc. paid a cash dividend of $1.24 per share of common stock on September 8, 2023. Pursuant to the terms of the Huntington Ingalls Industries, Inc. 2012 Long-Term Incentive Stock Plan, shares of common stock representing the dividend were deferred into a stock unit account in a transaction exempt by Rule 16b-3. /s/ Kathy S. Owen by Power of Attorney for Todd A. Borkey 2023-09-12