Sean Thomas Mullen Exercises Options at Amentum Holdings Inc (AMTM) — SEC Form 4, Nov 10, 2026

SEC Form 4 · No Market Transaction

Option Exercise

Derivative exercise — no open market transaction.

Reporting Owner

Sean Thomas Mullen

Officer

TXN 2026-11-06 · FILED 2026-11-10

Equity Position 37.3K sh 34,631 → 37,287

Equity Change +7.7% shares held after vs before

Filing Lag 2 business days within 2-day SEC deadline

Form 4 · Statement of Changes in Beneficial Ownership

Amentum Holdings Inc

AMTM CIK 0002011286

Reporting Owner

Name	Relationship
Sean Thomas Mullen CIK 0002034388	Officer

Sean Thomas Mullen at Amentum Holdings Inc Full insider history

Bought (12 mo) —

Sold (12 mo) —

More from this insider at Amentum Holdings Inc

Non-Derivative Securities Transactions

Title	Date	Type	Shares	Price	Net Total	Post-Txn	Ownership
Common StockF1	2026-11-06	M - Exercise	4,839 A		—	37,287	Direct
Common StockF2	2026-11-06	F - Tax Payment	2,183 D	$21.25	-$46,389	35,104	Direct

Derivative Securities Transactions

Title	Strike	Date	Type	Shares	Price	Expiration	Underlying	Ownership
Restricted Stock UnitsF3 F4 F4		2026-11-06	M - Exercise	4,839 D	$0.00		4,839 Common Stock	Direct

Footnotes (4)

F1: Represents distribution of AMTM common stock upon vesting of restricted stock units. Show more
F2: Represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock units. Show more
F3: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock. Show more
F4: One-third of the restricted stock units shall vest and be delivered, net of tax withholding, on each of the first, second and third anniversaries of the date of grant. Show more

Institutional Holders

Largest by reported value

5%+ Holders · 13D/G 5 filers

Latest Schedule 13D/G per filer; stakes the filer reported closed are left out.

Other insiders at Amentum Holdings Inc

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