Bruning Jill L 4

4 · Amentum Holdings, Inc. · Filed May 7, 2026

AI-generated summary of this filing

Updated May 7, 2026

Amentum (AMTM) CTO Jill Bruning Receives RSUs; 2,731 Shares Withheld

What Happened

Jill L. Bruning, Chief Technology Officer of Amentum Holdings (AMTM), had restricted stock units (RSUs) vest on May 6, 2026. The filing shows conversion/exercise of 9,072 derivative awards into common shares (code M).
To satisfy tax withholding on the vesting, 2,731 shares were tendered/disposed at $24.89 per share, for a withholding value of $67,975 (code F). The transactions are distributions upon RSU vesting rather than open-market purchases or voluntary sales.

Key Details

Transaction date: 2026-05-06.
Vesting/conversion: 9,072 RSUs converted to common stock (derivative conversion, code M).
Tax withholding: 2,731 shares withheld at $24.89 each = $67,975 (code F).
Footnotes: F1–F5 indicate these were RSU distributions (each RSU = 1 share), shares were withheld for taxes (F3), and the RSUs follow a staggered vesting schedule (half vest at 18 months and the remainder at 3 years). F2 notes 117 shares from the ESPP in March 2026 are included in holdings.
Shares owned after the transactions: not specified in the filing.
Filing timeliness: no late-filing indication noted in the report.

Context

This is a routine RSU vesting event with mandatory tax withholding — common for executive compensation. The filing shows conversion of derivative awards (RSUs) into stock and the employer withholding shares to cover tax obligations (not an open-market sale or purchase).

Form 4

Period: 2026-05-06

Chief Technology Officer

Transactions

Exercise/Conversion
Common Stock
[F1][F2]
2026-05-06+9,072→ 200,188 total
Tax Payment
Common Stock
[F3]
2026-05-06$24.89/sh−2,731$67,975→ 197,457 total
Exercise/Conversion
Restricted Stock Units
[F4][F5]
2026-05-06−9,072→ 9,073 total
→ Common Stock (9,072 underlying)

Footnotes (5)

[F1]Represents distribution of AMTM common stock upon vesting of restricted stock units.
[F2]Includes 117 shares acquired under the employee stock purchase plan in March 2026.
[F3]Represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock units.
[F4]Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.
[F5]One-half of the restricted stock units shall vest and be delivered on the 18th month and three-year anniversaries of the date of grant.

Signature

/s/ Indira Lall, Attorney-in-fact|2026-05-07

1 file