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Amentum CTO exercises 9,072 RSUs, withholds 2,731 shares

Amentum Holdings Chief Technology Officer Jill L. Bruning exercised 9,072 restricted stock units on May 6, 2026, receiving 9,072 shares of common stock.

(Neutral)
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Form Type
4

Rhea-AI Filing Summary

Amentum Holdings Chief Technology Officer Jill L. Bruning exercised 9,072 restricted stock units on May 6, 2026, receiving 9,072 shares of common stock. Of these, 2,731 shares were tendered at $24.89 per share to cover tax withholding. After these equity transactions, she directly holds 197,457 shares of Amentum common stock, including shares acquired under the employee stock purchase plan.

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Insider Bruning Jill L
Role Chief Technology Officer
Type Security Shares Price Value
Exercise Restricted Stock Units 9,072 $0.00 $0.00
Exercise Common Stock 9,072 $0.00 $0.00
Exercise Price or Tax Liability Common Stock 2,731 $24.89 $68K
Holdings After Transaction: Restricted Stock Units — 9,073 contracts (Direct); Common Stock — 197,457 shares (Direct)
Footnotes (5)
  1. F1. Represents distribution of AMTM common stock upon vesting of restricted stock units.
  2. F2. Includes 117 shares acquired under the employee stock purchase plan in March 2026.
  3. F3. Represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock units.
  4. F4. Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.
  5. 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.
RSUs Exercised 9072.0000 shares Restricted stock units vested and converted into common stock on May 6, 2026
Common Stock Acquired 9072.0000 shares Shares of Amentum common stock received upon RSU conversion
Shares Tendered for Taxes 2731.0000 shares Common shares delivered to satisfy tax withholding upon RSU vesting
Tax Withholding Price $24.8900 per share Per-share value used for shares tendered to cover tax obligations
Post-Transaction Common Holdings 197,457 shares Direct Amentum common stock position held by Jill L. Bruning after reported transactions
ESPP Shares Included 117 shares Shares acquired under the employee stock purchase plan in March 2026
Restricted Stock Units financial
"Represents distribution of AMTM common stock upon vesting of restricted stock units."
Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.
employee stock purchase plan financial
"Includes 117 shares acquired under the employee stock purchase plan in March 2026."
An employee stock purchase plan is a company program that lets workers buy shares through small payroll deductions, often at a discount to the market price and after a set offering period. Think of it like a workplace savings plan that turns into ownership: it encourages employees to share in the company’s success and can create predictable buying or selling of stock that investors watch because it affects supply, demand and employee incentives.
tax withholding financial
"Represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock units."
Tax withholding is the practice of taking a portion of a payment—such as wages, dividends, or sale proceeds—before it reaches the recipient and sending that portion to the tax authority as an advance on the recipient’s eventual tax bill. For investors it matters because withholding reduces immediate cash received and affects after‑tax returns, estimated tax payments, and whether you may owe more or receive a refund when taxes are finally calculated, like having a small automatic savings set aside for your tax bill.
contingent right financial
"Each restricted stock unit represents a contingent right to receive one share of AMTM common stock."

FAQ

What did Amentum (AMTM) CTO Jill L. Bruning report in this Form 4?

Jill L. Bruning reported vesting and exercise of 9,072 restricted stock units, receiving an equal number of Amentum common shares. She then tendered 2,731 shares to satisfy tax withholding and now directly holds 197,457 common shares in Amentum Holdings.

How many restricted stock units vested for Jill L. Bruning at Amentum (AMTM)?

Bruning had 9,072 restricted stock units vest and convert into Amentum common stock. Each unit represents a contingent right to one share, reflecting equity-based compensation that vests over time according to the company’s RSU grant schedule.

How many Amentum (AMTM) shares were withheld for taxes in this transaction?

A total of 2,731 common shares were tendered to cover tax withholding at a price of $24.89 per share. This tax-withholding disposition reduced the net shares retained from the RSU vesting but did not involve an open-market sale.

What is Jill L. Bruning’s Amentum (AMTM) common stock holding after these transactions?

Following the RSU vesting and tax-withholding share tender, Bruning directly holds 197,457 shares of Amentum common stock. This total includes shares received from equity awards and purchases through company-sponsored employee stock programs.

Do Jill L. Bruning’s Amentum (AMTM) holdings include employee stock purchase plan shares?

Yes. Her reported Amentum common stock holdings include 117 shares acquired under the employee stock purchase plan in March 2026. These plan shares are part of the overall 197,457-share direct common stock position.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Learn about SEC filing dates
SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
Bruning Jill L

(Last)(First)(Middle)
C/O AMENTUM HOLDINGS, INC.
4800 WESTFIELDS BOULEVARD, SUITE 400

(Street)
CHANTILLY VIRGINIA 20151

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
Amentum Holdings, Inc. [ AMTM ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Technology Officer
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
05/06/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Common Stock05/06/2026M9,072A(1)200,188(2)D
Common Stock05/06/2026F2,731(3)D$24.89197,457D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Restricted Stock Units(4)05/06/2026M9,072 (5) (5)Common Stock9,072$09,073D
Explanation of Responses:
1. Represents distribution of AMTM common stock upon vesting of restricted stock units.
2. Includes 117 shares acquired under the employee stock purchase plan in March 2026.
3. Represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock units.
4. Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.
5. 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.
Remarks:
/s/ Indira Lall, Attorney-in-fact05/07/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

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