Christopher D. Kastner - 25 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: 25 Feb 2026
Net transactions value: +$7,804,837
Form type: 4
Filing time: 27 Feb 2026, 16:19:25 UTC
Previous filing: 25 Feb 2026
Next filing: 02 Mar 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	27 Feb 2026	0001569904

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	HII	Common Stock	Award	$14,216,460	+32,638	+641%	$435.58	37,727	25 Feb 2026	Direct	F1
transaction	HII	Common Stock	Tax liability	$6,411,623	-14,720	-39%	$435.58	23,007	25 Feb 2026	Direct	F2
holding	HII	Common Stock						101	25 Feb 2026	By 401(k) Plan
holding	HII	Common Stock						67,479	25 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	Award	$0	+5,854	+39%	$0.000000	20,835	25 Feb 2026	Common Stock	5,854		Direct	F3
holding	HII	SEP						14,232	25 Feb 2026	Common Stock	3,296		Direct	F4

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

Explanation of Responses:

Id	Content
F1	Shares issued upon settlement of restricted performance stock rights ("RPSRs") for the performance period that ended on 12/31/2025.
F2	Shares withheld by issuer for payment of withholding taxes on RPSRs.
F3	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 2/25/26 and vest ratably in three equal installments upon each of the first, second, and third anniversaries of the grant date.
F4	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.