Amentum Holdings (AMTM) CTO amends Form 4, now holds 220,999 shares

Rhea-AI Filing Summary

Amentum Holdings, Inc. chief technology officer filed an amended insider ownership report to correct previously reported holdings of company stock. The Form 4/A shows that the officer now directly beneficially owns 220,999 shares of common stock after the update to Table I.

According to the explanation, the change reflects a non-reportable transaction in which shares were transferred through a pro-rata in-kind distribution by Amentum Joint Venture LP to its partners for no consideration as of 11/17/2025. The amendment is described as being made solely to report the correct holding figure, rather than to disclose a new purchase or sale.

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

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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^*

Bruning Jill L

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Technology 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								220,999(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.

FAQ

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

The filing reports an amended insider ownership position for Amentum Holdings' chief technology officer. It corrects the number of common shares directly beneficially owned rather than disclosing a new open-market trade.

How many Amentum Holdings (AMTM) shares does the reporting officer now hold?

After the correction, the officer is shown as directly beneficially owning 220,999 shares of Amentum Holdings, Inc. common stock in Table I of the filing.

What transaction led to the change in reported holdings for AMTM's officer?

The explanation states the change reflects shares transferred from a pro-rata in-kind distribution by Amentum Joint Venture LP to its partners, with the distribution described as occurring for no consideration.

What is the effective date of the AMTM insider transaction referenced in the amendment?

The date of the earliest transaction referenced in the amendment is listed as 11/17/2025, which is tied to the in-kind distribution described in the explanation.

Why was this Amentum Holdings (AMTM) Form 4/A amendment filed?

The note explains that this amendment is being filed solely to report the correct holding in Table I. It clarifies the impact of the in-kind distribution on the officer's reported share ownership.

Does the AMTM Form 4/A indicate that the officer paid cash for the additional shares?

No cash payment is described. The explanation says the relevant shares came from a pro-rata distribution in-kind by Amentum Joint Venture LP to its partners for no consideration at the time of the transaction.