X0306 4 2019-02-27 0 0001501585 HUNTINGTON INGALLS INDUSTRIES, INC. HII 0001569904 Kastner Christopher D 4101 WASHINGTON AVENUE NEWPORT NEWS VA 23607 0 1 0 0 Ex. VP, Bus Dev & CFO Common Stock 2019-02-27 4 A 0 14139 210.24 A 56404.717 D Common Stock 2019-02-28 4 F 0 6301 210.24 D 50103.717 D Units in 401(k) plan Common Stock 88.14 374.48 D The Huntington Ingalls Industries, Inc. Compensation Committee determined that all performance goals had been met for these restricted stock units, and they were issued on February 27, 2019. The issuer's outside administrator for the issuer's 401(k) plan holds issuer stock in a pooled fund as a participant investment option. Participant contributions designated for investment in issuer common stock are accounted for as units of interest in the issuer stock fund. Each unit was valued at $49.29 as of February 28, 2019. The unit value can fluctuate with fluctuations in the value of the issuer common stock and the daily cash position of the issuer stock fund. The number of shares of issuer stock attributable to the reporting person can be determined at any time by first multiplying the number of units in the reporting person's account by the then current unit price and dividing the total by the price of the issuer common stock. As of February 28, 2019, the reporting person held an equivalent of 88.14 shares in the issuer 401(k) plan. The 401(k) plan is a "Qualified Plan" as defined in Rule 16b-3(b)(4). Kathy S. Owen, Attorney-in-Fact for Christopher D. Kastner 2019-03-01