Michele T. St. Mary

CIK: 0002057553

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)0 (0.0%)

Position reduction

Option Exercises (M)1 (25.0%)

Derivative conversions

Awards (A)2 (50.0%)

Compensation grants

Other (G, F, J, C, D, …)1 (25.0%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

AMTM

Amentum Holdings, Inc.

Officer

Discretionary Trading P&L

Holdings

Transaction History (4 total)

AMTM
Amentum Holdings, Inc.
Feb 17, 2026
Exercise(M)
Direct
7.1K shares-
AMTM
Amentum Holdings, Inc.
Feb 17, 2026
Tax Payment(F)
Direct
2.3K shares at avg. $30.05$69K
AMTM
Amentum Holdings, Inc.
Nov 17, 2025
Award(A)
Direct
22.3K shares-
AMTM
Amentum Holdings, Inc.
Mar 17, 2025
Award(A)
Restricted Stock Units
Direct
21.2K shares-

		Type	Shares	Price		Ownership
Feb 17, 2026	AMTM Amentum Holdings, Inc.	Exercise(M)	7,080	-	$0	Direct
Feb 17, 2026	AMTM Amentum Holdings, Inc.	Tax Payment(F)	2,308	$30.05	$69,355	Direct
Nov 17, 2025	AMTM Amentum Holdings, Inc.	Award(A)	22,271	-	-	Direct
Mar 17, 2025	AMTM Amentum Holdings, Inc.	Award(A) Restricted Stock Units	21,242	-	-	Direct

1-4 of 4 transactions

About St. Mary Michele T

St. Mary Michele T (SEC CIK 0002057553) files insider reports with the SEC as Chief Legal Officer & GC of Amentum Holdings, Inc. (AMTM).

Signal8 holds 4 ownership filings by St. Mary Michele T (1 Form 3, 3 Form 4), filed between Feb 24, 2025 and Feb 18, 2026. Those filings report 4 transactions, from Mar 17, 2025 to Feb 17, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on St. Mary Michele T's filings is in CHANTILLY, VA.

Recent filings by St. Mary Michele T

Feb 17, 2026: Option exercise of AMTM shares (Form 4, code M).
Feb 17, 2026: Tax withholding of AMTM shares (Form 4, code F).
Nov 17, 2025: Grant or award of AMTM shares (Form 4, code A).
Mar 17, 2025: Grant or award of AMTM derivative securities (Form 4, code A).

Other insiders filing for Amentum Holdings, Inc. (AMTM)

Thompson Christopher M.T., Director
Heller John E., Chief Executive Officer
Mullen Sean Thomas, Chief Growth Officer
Johnson Travis Barton, Chief Financial Officer
Bruning Jill L, Chief Technology Officer
Arnette Stephen A, Chief Operating Officer

How to read Form 4 transaction codes