HII director granted 174 deferred stock units

O'Sullivan Stephanie L. reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

O'Sullivan Stephanie L. reported acquisition or exercise transactions in this Form 4 filing.

Huntington Ingalls Industries director Stephanie L. O'Sullivan received an award of 174 shares of common stock equivalents valued at $278.97 per share. The award was deferred into a stock unit account under the Huntington Ingalls Industries, Inc. 2022 Long-Term Incentive Stock Plan in an exempt transaction pursuant to Rule 16b-3. Following this grant, O'Sullivan directly holds 4,212.703 shares of common stock equivalents, indicating a routine, compensation-related increase in her equity-based holdings rather than an open-market purchase.

Insider Trade Summary

Grant/Award: 174 shares

Grant/Award 1 txn

Insider O'Sullivan Stephanie L.

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock (SUA)	174	$278.97	$49K

Holdings After Transaction: Common Stock (SUA) — 4,212.703 shares (Direct)

Footnotes (1)

1. F1. Shares of common stock deferred into stock unit account pursuant to Huntington Ingalls Industries, Inc. 2022 Long-Term Incentive Stock Plan in an exempt transaction pursuant to Rule 16b-3.

Key Figures

Stock units granted: 174 shares Grant price: $278.97 per share Holdings after transaction: 4,212.703 shares

3 metrics

Stock units granted 174 shares Award of common stock equivalents to director

Grant price $278.97 per share Reference price for stock unit award

Holdings after transaction 4,212.703 shares Director’s direct common stock equivalents after grant

Key Terms

2022 Long-Term Incentive Stock Plan, stock unit account, Rule 16b-3, Common Stock (SUA)

4 terms

2022 Long-Term Incentive Stock Plan financial

"pursuant to Huntington Ingalls Industries, Inc. 2022 Long-Term Incentive Stock Plan"

stock unit account financial

"Shares of common stock deferred into stock unit account"

Rule 16b-3 regulatory

"in an exempt transaction pursuant to Rule 16b-3"

Rule 16b-3 is a Securities and Exchange Commission regulation that exempts certain routine, pre-approved transactions by company insiders from automatic liability for short-term trading profits. It acts like a safe harbor: if an insider follows a formal plan or the board approves specific transactions in advance, profits from buying and selling company stock within six months are not automatically reclaimed. Investors care because the rule clarifies when insider trades are permissible and reduces uncertainty about potential clawbacks.

Common Stock (SUA) financial

"security_title: Common Stock (SUA)"

FAQ

What insider transaction did HII director Stephanie O'Sullivan report on this Form 4?

Director Stephanie O'Sullivan reported receiving an award of 174 common stock equivalents. These were granted as part of Huntington Ingalls Industries’ 2022 Long-Term Incentive Stock Plan and deferred into a stock unit account rather than acquired in an open-market purchase.

At what price were the HII stock units granted to Stephanie O'Sullivan?

The stock units were granted at $278.97 per share. This value reflects the reference price used for the award of 174 common stock equivalents under the company’s 2022 Long-Term Incentive Stock Plan for director compensation.

How many Huntington Ingalls Industries shares does Stephanie O'Sullivan hold after this transaction?

After the award, Stephanie O'Sullivan holds 4,212.703 common stock equivalents directly. This total includes the new 174-unit grant and reflects her accumulated equity-based compensation position as a director of Huntington Ingalls Industries.

Was Stephanie O'Sullivan’s HII Form 4 transaction an open-market stock purchase?

No, the transaction was not an open-market purchase. It was a grant of 174 deferred stock units under the 2022 Long-Term Incentive Stock Plan, categorized as an exempt award under SEC Rule 16b-3 for director compensation.

What plan governed the HII stock unit award to Stephanie O'Sullivan?

The award was made under the Huntington Ingalls Industries, Inc. 2022 Long-Term Incentive Stock Plan. The filing notes that the 174 shares of common stock equivalents were deferred into a stock unit account pursuant to this plan in an exempt Rule 16b-3 transaction.

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Accepted by SEC EDGAR 07/02/2026 - 04:16 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

O'Sullivan Stephanie L.

(Last) (First) (Middle)

4101 WASHINGTON AVENUE

(Street)

NEWPORT NEWS VIRGINIA 23607

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
HUNTINGTON INGALLS INDUSTRIES, INC. [ HII ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/01/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock (SUA)	07/01/2026		A		174(1)	A	$278.97	4,212.703	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Shares of common stock deferred into stock unit account pursuant to Huntington Ingalls Industries, Inc. 2022 Long-Term Incentive Stock Plan in an exempt transaction pursuant to Rule 16b-3.

Remarks:

	/s/ Tiffany M. King, Attorney-in-Fact	07/02/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)