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

AMTM insider gets 90,727 shares; 28,818 withheld at $21.79

Filing Impact
(Very High)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

Amentum Holdings (AMTM) reported an insider equity event. On November 6, 2025, the Executive Chair and Director received 90,727 shares of common stock upon the vesting of restricted stock units.

To cover taxes, 28,818 shares were withheld at $21.79 per share. Following these transactions, the insider held 682,802 shares directly. An additional 23,550 shares were reported as indirectly owned by a spouse. The RSU award vested on November 6, 2025, and the corresponding derivative balance was reduced to zero upon share delivery.

Positive

  • None.

Negative

  • None.
Insider DEMETRIOU STEVEN J.
Role Executive Chair
Type Security Shares Price Value
Exercise Restricted Stock Units 90,727 $0.00 --
Exercise Common Stock 90,727 $0.00 --
Tax Withholding Common Stock 28,818 $21.79 $628K
holding Common Stock -- -- --
Holdings After Transaction: Restricted Stock Units — 0 shares (Direct); Common Stock — 711,620 shares (Direct); Common Stock — 23,550 shares (Indirect, By Spouse)
Footnotes (1)
  1. Represents distribution of AMTM common stock upon vesting of restricted stock units. Represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock units. Each restricted stock unit represents a contingent right to receive one share of AMTM common stock. The restricted stock units awarded vested on November 6, 2025.
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*
DEMETRIOU STEVEN J.
(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)
Executive Chair
3. Date of Earliest Transaction (Month/Day/Year)
11/06/2025
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 11/06/2025 M 90,727 A (1) 711,620 D
Common Stock 11/06/2025 F 28,818(2) D $21.79 682,802 D
Common Stock 23,550 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
Restricted Stock Units (3) 11/06/2025 M(1) 90,727 (4) (4) Common Stock 90,727 $0 0 D
Explanation of Responses:
1. Represents distribution of AMTM common stock upon vesting of restricted stock units.
2. Represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock units.
3. Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.
4. The restricted stock units awarded vested on November 6, 2025.
Remarks:
/s/ Mark Esposito, Attorney-in-Fact 11/10/2025
** 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.

Source: View Original Filing on SEC EDGAR

FAQ

What did AMTM’s Executive Chair report on Form 4?

Vesting of 90,727 restricted stock units into common shares on November 6, 2025, with shares withheld for taxes.

How many AMTM shares were withheld for taxes and at what price?

28,818 shares were withheld at $21.79 per share to satisfy tax obligations.

How many AMTM shares does the insider own directly after the transaction?

The insider reported 682,802 shares held directly after the transactions.

Were there any indirect AMTM holdings reported?

Yes. 23,550 shares were reported as indirectly owned by the insider’s spouse.

What happened to the RSUs after vesting?

The RSUs converted into 90,727 shares and the derivative balance decreased to 0 upon delivery.

What is the transaction code for the RSU conversion?

Code M indicates the distribution of shares upon RSU vesting; code F indicates shares withheld for taxes.