X0306 4 2019-03-07 0 0001501585 HUNTINGTON INGALLS INDUSTRIES, INC. HII 0001706050 Boykin Jennifer R. C/O HUNTINGTON INGALLS INDUSTRIES, INC. 4101 WASHINGTON AVE. NEWPORT NEWS VA 23607 0 1 0 0 Ex VP, President NNS Common Stock 2019-03-08 4 S 0 2647 199.659 D 4659.705 D Common Stock 2019-03-07 4 I 0 3298.65 201.46 A 3431.4 I By 401(k) plan The price shown is the weighted average price at which shares were sold in multiple sales transactions made pursuant to a single market order. The range of prices for the transactions was $199.29 to $200.16. Upon request by SEC staff, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price. The transaction constitutes an intra-plan transfer in the Huntington Ingalls Industries, Inc. 401(k) plan (the "Plan") from one investment option to the HII Stock Fund. The reporting person's interest in the HII Stock Fund is held in the form of units of interest. The Plan's administrator calculates the number of shares of issuer common stock represented by units in the HII Stock Fund. The 401(k) plan is a "Qualified Plan" as defined in Rule 16b-3(b)(4). This number includes 132.75 shares that were previously reported in Table II. Kathy S. Owen, Attorney-in-Fact for Jennifer R. Boykin 2019-03-11