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

Role: Ex VP and President, Ingalls
Signature: /s/ Tiffany M. King, Attorney-in-Fact
Issuer symbol: HII
Transactions as of: 26 Feb 2026
Net transactions value: +$24,011
Form type: 4
Filing time: 02 Mar 2026, 16:16:41 UTC
Previous filing: 27 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Blanchette Brian D.	Ex VP and President, Ingalls	4101 WASHINGTON AVENUE, NEWPORT NEWS	/s/ Tiffany M. King, Attorney-in-Fact	02 Mar 2026	0002049633

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	HII	Common Stock	Options Exercise	$42,384	+96	+3.8%	$443.00	2,631	26 Feb 2026	Direct
transaction	HII	Common Stock	Tax liability	$18,373	-41	-1.6%	$443.00	2,589	26 Feb 2026	Direct	F1
holding	HII	Common Stock						1,408	26 Feb 2026	By 401(k) Plan

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	-96	-3.1%	$0.000000	2,946	26 Feb 2026	Restricted Stock Rights	96		Direct	F2
holding	HII	SEP						3,785	26 Feb 2026	SEP Unit	876		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.