Amentum Holdings, Inc.

AMTM

Form 4 • Statement of Changes in Beneficial Ownership

SEC Accession Number: 0001628280-26-014626
Filing date: Mar 4, 2026
Earliest execution date: Mar 2, 2026
Reporting Owners: Arnette Stephen A (COO)

Summary

Type

Sell

Net shares

-750

% of shares

-0.77%

Amount (USD)

$23,025

Insider confidence score

48.8 out of 100

Positive

  • Tax withholding obligation
  • Small sell amount (<$50K)

Negative

  • Moderate tax withholding sell (≥0.5% of shares)

Stock transactions

Transaction 1

Security

Common Stock

Action

Exercise

Date

2026-03-02

Code

M

Net shares

+2,808.0

Acquired/Disposed

Acquired

Shares Owned Before

94,299.0

Shares Owned After

97,107.0

Transaction 2

Security

Common Stock

Action

Tax_withhold

Date

2026-03-02

Code

F

Net shares

-750.0

Price per Share

$30.70

Amount (USD)

$23,025.00

Acquired/Disposed

Disposed

Shares Owned Before

97,107.0

Shares Owned After

96,357.0

Derivative Transactions

Transaction 1

Security

Restricted Stock Units

Action

Exercise

Date

2026-03-02

Code

M

Net shares

-2,808.0

Acquired/Disposed

Disposed

Shares Owned Before

2,808.0

Shares Owned After

0.0

Filing's footnotes

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 March 2, 2026.

This page is for informational purposes only. While we strive for accuracy, the summary may contain inaccuracies or omissions. Please refer to the official SEC filing for authoritative information. Open the SEC filing.