X0306 4 2022-03-11 0 0001501585 HUNTINGTON INGALLS INDUSTRIES, INC. HII 0001886377 Holmes Stewart H. 4101 WASHINGTON AVE NEWPORT NEWS VA 23607 0 1 0 0 Ex. VP, Govt & Cust Relations Common Stock 2022-03-11 4 A 0 17.535 206.07 A 3079.843 D Huntington Ingalls Industries, Inc. paid a cash dividend of $1.18 per share of common stock on March 11, 2022. 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, Attorney-in-Fact for Stewart H. Holmes 2022-03-15