Amentum director gifts 4,250 shares to family

Amentum Holdings, Inc. (AMTM) director Christopher M.T.

Rhea-AI Filing Summary

Amentum Holdings, Inc. (AMTM) director Christopher M.T. Thompson reported a bona fide gift of 4,250 shares of AMTM common stock on August 14, 2026. The transfer was made through an LLC interest to an immediate family member for no consideration and is reported as indirect ownership by a trust.

After the gift, reported holdings include 5,750 shares held indirectly by a trust, 5,062 shares held directly, and 14,000 shares held indirectly by a spouse. No Rule 10b5-1 trading plan is reported, and a footnote states the filing was submitted late due to an administrative oversight.

Insider Trade Summary

4,250 shares gifted

Gift 3 txns

Insider Thompson Christopher M.T.

Role Director

Type	Security	Shares	Price	Value
Gift	Common Stock F1, F2	4,250	$0.00	$0.00
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 5,750 shares (Indirect, By Trust); Common Stock — 5,062 shares (Direct); Common Stock — 14,000 shares (Indirect, By Spouse)

Footnotes (2)

1. F1. Mr. Thompson's filing was late due to an administrative oversight.
2. F2. On August 14, 2026, the reporting person transferred an LLC interest representing 4,250 shares of AMTM common stock to an immediate family for no consideration.

Key Figures

Shares gifted: 4,250 shares Indirect holdings by trust after transaction: 5,750 shares Direct holdings after transaction: 5,062 shares +3 more

6 metrics

Shares gifted 4,250 shares Bona fide gift of AMTM common stock on August 14, 2026

Indirect holdings by trust after transaction 5,750 shares AMTM common stock held indirectly by trust after August 14, 2026 gift

Direct holdings after transaction 5,062 shares AMTM common stock held directly by Christopher M.T. Thompson after transactions

Indirect holdings by spouse after transaction 14,000 shares AMTM common stock held indirectly by spouse after August 14, 2026

Gift price per share $0.00 per share Bona fide gift made for no consideration

Gift transactions in this filing 1 gift transaction Form 4 transaction summary for August 14, 2026

Key Terms

bona fide gift, indirect ownership, Rule 10b5-1

3 terms

bona fide gift regulatory

"reported a bona fide gift of 4,250 shares of AMTM common stock"

A bona fide gift is a genuine, voluntary transfer of money, property, or benefits from one party to another made without expectation of repayment, services, or hidden conditions. Investors care because such gifts can affect company disclosures, related‑party transaction rules, tax treatment, and perceived conflicts of interest; think of it like someone giving you a present with no strings attached — but on a corporate scale, auditors and regulators need to verify it really is unconditional.

indirect ownership financial

"shares held indirectly by a trust and by spouse are reported"

Rule 10b5-1 regulatory

"No Rule 10b5-1 trading plan is reported for this transaction"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did AMTM director Christopher M.T. Thompson report?

He reported a bona fide gift of 4,250 shares of Amentum Holdings, Inc. (AMTM) common stock on August 14, 2026, transferring an LLC interest representing those shares to an immediate family member for no consideration, held indirectly through a trust.

How many AMTM shares did Christopher M.T. Thompson hold indirectly by trust after the gift?

Following the reported gift, Christopher M.T. Thompson is shown as holding 5,750 shares of AMTM common stock indirectly by trust, according to the post-transaction holdings in the Form 4.

What are Christopher M.T. Thompson’s direct AMTM share holdings after this Form 4?

The Form 4 reports that after the August 14, 2026 transactions, Christopher M.T. Thompson held 5,062 shares of AMTM common stock directly.

How many AMTM shares are reported as held indirectly by Thompson’s spouse?

The filing shows an additional 14,000 shares of AMTM common stock held indirectly by spouse after the reported transactions on August 14, 2026.

Was the AMTM Form 4 for Christopher M.T. Thompson timely filed?

A footnote states that the filing was late due to an administrative oversight, indicating the Form 4 for the August 14, 2026 gift transaction was not submitted on time.

Were the AMTM insider transactions made under a Rule 10b5-1 trading plan?

No. The Form 4 indicates no Rule 10b5-1 plan is reported for the August 14, 2026 gift transaction by director Christopher M.T. Thompson.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/17/2026 - 09:36 PM Accepted by SEC EDGAR 09/17/2026 - 09:35 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^*

Thompson Christopher M.T.

(Last) (First) (Middle)

C/O AMENTUM HOLDINGS, INC.

4800 WESTFIELDS BOULEVARD, SUITE 400

(Street)

CHANTILLY VIRGINIA 20151

(City) (State) (Zip)

UNITED STATES

(Country)

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
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/14/2026

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								5,062	D
Common Stock	08/14/2026(1)		G		4,250	D	$0	5,750	I(2)	By Trust
Common Stock								14,000	I	By Spouse

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. Mr. Thompson's filing was late due to an administrative oversight.

2. On August 14, 2026, the reporting person transferred an LLC interest representing 4,250 shares of AMTM common stock to an immediate family for no consideration.

Remarks:

	/s/ Indira Lall, Attorney-in-fact	09/17/2026
	** 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)