Amentum (AMTM) Form 3 Initial statement of insider ownership

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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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1. Name and Address of Reporting Person^*

ASP Manager Corp.

(Last) (First) (Middle)

C/O AMERICAN SECURITIES LLC

590 MADISON AVENUE, 38TH FLOOR

(Street)

NEW YORK NY 10022

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
12/17/2024

3. Issuer Name and Ticker or Trading Symbol
Amentum Holdings, Inc. [ AMTM ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

Director	X	10% Owner
Officer (give title below)		Other (specify below)

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

	Form filed by One Reporting Person
X	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	43,893,904	I	See Footnotes(1)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

1. Name and Address of Reporting Person^*

ASP Manager Corp.

(Last) (First) (Middle)

C/O AMERICAN SECURITIES LLC

590 MADISON AVENUE, 38TH FLOOR

(Street)

NEW YORK NY 10022

(City) (State) (Zip)

1. Name and Address of Reporting Person^*

AMERICAN SECURITIES LLC

(Last) (First) (Middle)

C/O AMERICAN SECURITIES LLC

590 MADISON AVENUE, 38TH FLOOR

(Street)

NEW YORK NY 10022

(City) (State) (Zip)

Explanation of Responses:

1. American Securities LLC is the sole stockholder of ASP Manager Corp., which is the general partner of ASP Amentum Investco LP. Each of the Reporting Persons may be deemed to share beneficial ownership of the common shares of Amentum Holdings, Inc. directly held by ASP Amentum Investco LP.

	/s/ Eric L. Schondorf, Authorized Signatory for ASP Manager Corp.	12/27/2024
	/s/ Eric L. Schondorf, Authorized Signatory for American Securities LLC	12/27/2024
	** 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 5 (b)(v).
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