Christopher D. Kastner - 26 Feb 2026 Form 4 Insider Report for HUNTINGTON INGALLS INDUSTRIES, INC. (HII)

Role: Director, President & CEO, Director
Signature: /s/ Tiffany M. King, Attorney-in-Fact
Issuer symbol: HII
Transactions as of: 26 Feb 2026
Net transactions value: +$570,077
Form type: 4
Filing time: 02 Mar 2026, 16:16:29 UTC
Previous filing: 27 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Kastner Christopher D	Director, President & CEO, Director	4101 WASHINGTON AVENUE, NEWPORT NEWS	/s/ Tiffany M. King, Attorney-in-Fact	02 Mar 2026	0001569904

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	HII	Common Stock	Options Exercise	$1,038,392	+2,344	+10%	$443.00	25,351	26 Feb 2026	Direct
transaction	HII	Common Stock	Tax liability	$468,315	-1,057	-4.2%	$443.00	24,294	26 Feb 2026	Direct	F1
holding	HII	Common Stock						101	26 Feb 2026	By 401(k) Plan
holding	HII	Common Stock						67,479	26 Feb 2026	Held in the Kastner Family Trust

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	HII	Restricted Stock Rights	Options Exercise	$0	-2,344	-11%	$0.000000	18,491	26 Feb 2026	Common Stock	2,344		Direct	F2
holding	HII	SEP						14,232	26 Feb 2026	Common Stock	3,296		Direct	F3

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Shares withheld by issuer for the payment of withholding taxes on restricted stock rights ("RSRs") that vested on 2/26/26.
F2	Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") on 2/26/24 and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.
F3	The reporting person's interest in the HII Stock Fund of the Huntington Ingalls Industries, Inc. Savings Excess Plan (the "Plan") 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.