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$AMTM All transactions

Amentum Holdings, Inc.

M

$ Value

Shares

1,178

Price

Filed

Nov 19

Insider

Name

Arnette Stephen A

Title

Chief Operating Officer

CIK

0001919492

Roles

Officer

Transaction Details

Transaction Date

2025-11-17

Code

M

Table

Non-Derivative

Ownership

Direct

Equity Swap

No

Shares After

47,243

Footnotes

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. | One-third of the restricted stock units shall vest on each of the first, second and third anniversaries of November 17, 2025. | Each restricted stock unit represents a contingent right to receive one share of AMTM common stock. | The restricted stock units awarded vested on November 17, 2025.

Filing Info

Accession No.

0001628280-25-053268

Form Type

4

Issuer CIK

0002011286

Arnette Stephen A's History

Date Ticker Type Value
2026-03-02 AMTM M
2026-03-02 AMTM F $23K
2026-03-02 AMTM M $0
2025-11-17 AMTM M
2025-11-17 AMTM F $6K
2025-11-17 AMTM A $0
2025-11-17 AMTM M $0
2025-11-16 AMTM M
2025-11-16 AMTM F $27K
2025-11-16 AMTM M

Other Insiders at AMTM (90d)

Insider Bought Sold Last
EBERHART RALPH E 2026-02-06
Thompson Christopher M.T. 2026-02-06
Heller John E.
Chief Executive Officer
2026-01-28
Rowland Sandra E. 2026-02-06
IRELAND SUSAN LESLIE 2026-02-06
Vollmer John C. 2026-02-06
Loughran Barbara 2026-02-06
Brooks Vincent K 2026-02-06
Arnette Stephen A
Chief Operating Officer
2026-03-02
Bruning Jill L
Chief Technology Officer
2026-03-04
St. Mary Michele T
Chief Legal Officer & GC
2026-02-17