Thomas E. Stiehle - 26 Feb 2026 Form 4 Insider Report for HUNTINGTON INGALLS INDUSTRIES, INC. (HII)

Role: Ex. VP and CFO
Signature: /s/ Tiffany M. King, Attorney-in-Fact
Issuer symbol: HII
Transactions as of: 26 Feb 2026
Net transactions value: +$131,518
Form type: 4
Filing time: 02 Mar 2026, 16:16:35 UTC
Previous filing: 27 Feb 2026
Next filing: 09 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Stiehle Thomas E.	Ex. VP and CFO	4101 WASHINGTON AVENUE, NEWPORT NEWS	/s/ Tiffany M. King, Attorney-in-Fact	02 Mar 2026	0001846302

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	HII	Common Stock	Options Exercise	$239,559	+541	+1.9%	$443.00	29,698	26 Feb 2026	Direct
transaction	HII	Common Stock	Tax liability	$108,041	-244	-0.82%	$443.00	29,454	26 Feb 2026	Direct	F1

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	-541	-12%	$0.000000	3,959	26 Feb 2026	Common Stock	541		Direct	F2

* 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.

Content

Shares withheld by issuer for the payment of withholding taxes on restricted stock rights ("RSRs") that vested on 2/26/26.

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.