[Form 4] Amentum Holdings, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Amentum Holdings, Inc. (AMTM) reported that its Chief Executive Officer and director received a grant of 155,897 shares of common stock in the form of restricted stock units on 11/17/2025. The grant was recorded at a price of $0 per share, consistent with equity compensation awards, and brought the CEO’s directly held beneficial ownership to 269,440 shares after the transaction.

According to the vesting terms, one-third of these restricted stock units will vest on each of the first, second, and third anniversaries of November 17, 2025. This schedule means the award is structured to align the CEO’s equity compensation with multi‑year company performance and continued service.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Heller John E.

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	155,897	$0.00	--

Holdings After Transaction: Common Stock — 269,440 shares (Direct)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

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^*

Heller John E.

(Last) (First) (Middle)

C/O AMENTUM HOLDINGS, INC.

4800 WESTFIELDS BOULEVARD, SUITE 400

(Street)

CHANTILLY VA 20151

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Amentum Holdings, Inc. [ AMTM ]

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

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

3. Date of Earliest Transaction (Month/Day/Year)
11/17/2025

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

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

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

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	11/17/2025		A		155,897(1)	A	$0	269,440	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. One-third of the restricted stock units shall vest on each of the first, second and third anniversaries of November 17, 2025.

Remarks:

	/s/ Mark Esposito, Attorney-in-Fact	11/19/2025
	** 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.

FAQ

What did Amentum Holdings (AMTM) report in this Form 4 filing?

Amentum Holdings, Inc. reported that its Chief Executive Officer and director acquired 155,897 restricted stock units of common stock on 11/17/2025, increasing his directly held beneficial ownership to 269,440 shares.

Who is the reporting person in the Amentum Holdings (AMTM) Form 4?

The reporting person is the Chief Executive Officer of Amentum Holdings, Inc., who also serves as a director of the company.

How many Amentum (AMTM) shares were granted to the CEO in this transaction?

The CEO was granted 155,897 restricted stock units of Amentum common stock, recorded at a price of $0 per share as equity compensation.

What is the vesting schedule for the 155,897 Amentum (AMTM) restricted stock units?

One-third of the restricted stock units will vest on each of the first, second, and third anniversaries of November 17, 2025.

How many Amentum (AMTM) shares does the CEO beneficially own after this Form 4 transaction?

After the reported transaction, the CEO beneficially owns 269,440 shares of Amentum common stock in direct ownership.

Is this Amentum (AMTM) Form 4 filed by one or multiple reporting persons?

The Form 4 is indicated as filed by one reporting person.