Amentum CEO updates insider holdings after JV share transfer

Amentum Holdings, Inc. reports an amended insider ownership filing for its Chief Executive Officer, who also serves as a director.

Rhea-AI Filing Summary

Amentum Holdings, Inc. reports an amended insider ownership filing for its Chief Executive Officer, who also serves as a director. The Form 4/A updates the number of common shares beneficially owned to 333,847 shares held directly after a previously misreported balance.

According to the explanation, the change reflects a non-reportable transfer of shares received from a pro-rata in-kind distribution by Amentum Joint Venture LP to its partners for no consideration at the time of the transaction. The amendment is being filed solely to correct the holding shown in the non-derivative securities table and does not describe a new purchase or sale for cash.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Heller John E.

Role Chief Executive Officer

Type	Security	Shares	Price	Value
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 333,847 shares (Direct)

Footnotes (1)

1. F1. This Form 4/A is being filed solely to report the correct holding in Table I. It reflects a non-reportable transaction for shares transferred from the pro-rata distribution in-kind by Amentum Joint Venture LP to its partners for no consideration at the time of the transaction.

FAQ

What insider change did Amentum Holdings (AMTM) report in this Form 4/A?

The filing shows the Amentum Holdings Chief Executive Officer and director now beneficially owns 333,847 shares of common stock directly after correcting a previously reported balance.

Why did Amentum Holdings (AMTM) file an amended Form 4 rather than a new Form 4?

The document states it is an amendment filed solely to report the correct holding in Table I, updating the insider’s common stock balance rather than reporting a new cash purchase or sale.

What transaction led to the share change disclosed for Amentum Holdings (AMTM)?

The explanation notes the change reflects shares transferred through a pro-rata in-kind distribution by Amentum Joint Venture LP to its partners, rather than an open-market trade.

Was cash paid or received in the Amentum Holdings (AMTM) insider share transfer?

The filing specifies that the in-kind distribution from Amentum Joint Venture LP to its partners occurred for no consideration at the time of the transaction.

Does this Amentum Holdings (AMTM) Form 4/A involve derivative securities?

Table II for derivative securities is present but contains no filled-in derivative entries, while the correction applies to the non-derivative common stock holdings in Table I.

Who is the reporting person in this Amentum Holdings (AMTM) insider filing and what is their role?

The reporting person is identified as a Director and Officer (Chief Executive Officer) of Amentum Holdings, Inc., filing individually as one reporting person.

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Accepted by SEC EDGAR 12/19/2025 - 06:49 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^*

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)
11/19/2025

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								333,847(1)	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. This Form 4/A is being filed solely to report the correct holding in Table I. It reflects a non-reportable transaction for shares transferred from the pro-rata distribution in-kind by Amentum Joint Venture LP to its partners for no consideration at the time of the transaction.

Remarks:

	/s/ Mark Esposito, Attorney-in-Fact	12/19/2025
	** 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.