Amentum (AMTM) director Barbara Loughran granted 5,062 restricted stock units

Rhea-AI Filing Summary

Amentum Holdings director Barbara Loughran received an equity grant from the company. On 02/06/2026 she acquired 5,062 shares of common stock at a price of $0, increasing her beneficial ownership to 9,662 shares held directly. The grant is in the form of restricted stock units that will vest on the date of Amentum’s next annual meeting of stockholders, aligning a portion of her compensation with the company’s future performance and share value.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Loughran Barbara

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	5,062	$0.00	--

Holdings After Transaction: Common Stock — 9,662 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^*

Loughran Barbara

(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
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
02/06/2026

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	02/06/2026		A		5,062(1)	A	$0	9,662	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. The restricted stock units shall vest on the date of the next annual meeting of stockholders of the Issuer.

Remarks:

	/s/ Indira Lall, Attorney-in-fact	02/10/2026
	** 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.

FAQ

What did Amentum (AMTM) director Barbara Loughran report on this Form 4?

Barbara Loughran reported receiving 5,062 shares of Amentum common stock on 02/06/2026. The transaction was coded as an acquisition at a price of $0, reflecting an equity compensation award rather than an open‑market purchase.

How many Amentum (AMTM) shares does Barbara Loughran own after this transaction?

After the reported transaction, Barbara Loughran beneficially owns 9,662 shares of Amentum common stock. This total reflects her holdings directly following the grant of 5,062 shares, as disclosed in the Form 4 filing’s ownership table.

What type of equity award did Amentum (AMTM) grant to Barbara Loughran?

The award consists of restricted stock units tied to Amentum common stock. According to the filing footnote, these restricted stock units will vest on the date of the next annual meeting of stockholders, subject to the standard vesting conditions described.

At what price were Barbara Loughran’s new Amentum (AMTM) shares acquired?

The 5,062 Amentum shares were acquired at a price of $0 per share. This indicates they were granted as part of a compensation arrangement, rather than purchased in the market, and are structured as restricted stock units that vest at the next annual meeting.

When will Barbara Loughran’s Amentum (AMTM) restricted stock units vest?

The restricted stock units will vest on the date of Amentum’s next annual meeting of stockholders. Vesting on that meeting date means her right to the underlying shares becomes non‑forfeitable at that time, assuming applicable conditions are satisfied.

Is this Amentum (AMTM) Form 4 filing a purchase or a compensation grant?

The Form 4 reflects a compensation grant, not a market purchase. Barbara Loughran acquired 5,062 shares at $0 per share as restricted stock units, which are scheduled to vest on the date of Amentum’s next annual stockholder meeting.