X0306 4 2022-03-11 0 0001501585 HUNTINGTON INGALLS INDUSTRIES, INC. HII 0001465175 Jimenez Frank R 4101 WASHINGTON AVE. NEWPORT NEWS VA 23607 1 0 0 0 Common Stock 2022-03-11 4 A 0 1.214 206.07 A 213.214 I See Footnote 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. Represents vested restricted stock units credited to the Reporting Person's account pursuant to Huntington Ingalls Industries, Inc.'s 2012 Long-Term Incentive Stock Plan. Each director stock unit represents a right to receive one share of Issuer common stock (or cash equivalent value), which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors. /s/ Kathy S. Owen, Attorney-in-Fact for Frank R. Jimenez 2022-03-14