Amentum CGO RSU vesting and tax withholding
Amentum Holdings, Inc. Chief Growth Officer Sean Thomas Mullen reported routine equity compensation activity involving restricted stock units and related tax withholding.
Rhea-AI Filing Summary
Amentum Holdings, Inc. Chief Growth Officer Sean Thomas Mullen reported routine equity compensation activity involving restricted stock units and related tax withholding. On May 6, 2026, 9,072 restricted stock units were exercised into an equal number of AMTM common shares, reflecting vesting of stock-based awards.
In connection with this vesting, 2,762 shares of AMTM common stock were tendered to cover tax withholding obligations, a non-market disposition. Following these transactions, Mullen directly held 32,448 shares of AMTM common stock and 9,073 restricted stock units, which vest in two installments on the 18-month and three-year anniversaries of the grant date.
Positive
- None.
Negative
- None.
Insider Trade Summary
9,072 shares exercised/converted
Exercise
3 txns
Insider
Mullen Sean Thomas
Role
Chief Growth 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 | 2,762 | $24.89 | $69K |
Holdings After Transaction:
Restricted Stock Units — 9,073 contracts (Direct);
Common Stock — 32,448 shares (Direct)
Footnotes (4)
- F1. Represents distribution of AMTM common stock upon vesting of restricted stock units.
- F2. Represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock.
- F3. Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.
- F4. 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.
Key Figures
RSUs exercised: 9,072 units
Shares for tax withholding: 2,762 shares
Common shares after transactions: 35,210 shares
+3 more
6 metrics
RSUs exercised
9,072 units
Restricted stock units converted into AMTM common stock on May 6, 2026
Shares for tax withholding
2,762 shares
AMTM common stock tendered to cover tax obligations on May 6, 2026
Common shares after transactions
35,210 shares
Direct AMTM common stock holdings following reported Form 4 transactions
RSUs remaining
9,073 units
Restricted stock units held after vesting and delivery activity
RSU vesting schedule
Two installments
One-half vests at 18 months and one-half at three years from grant
Tax-withholding price reference
$24.89 per share
Value used for the 2,762 shares tendered for tax withholding
Key Terms
Restricted Stock Units, tax withholding, derivative exercise/conversion, contingent right, +1 more
5 terms
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.
tax withholding financial
"Represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock."
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.
derivative exercise/conversion financial
"transaction_action: derivative exercise/conversion"
contingent right financial
"Each restricted stock unit represents a contingent right to receive one share of AMTM common stock."
vesting financial
"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."
Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.
FAQ
What transactions did Amentum (AMTM) Chief Growth Officer report on this Form 4?
Sean Thomas Mullen reported vesting and exercise of 9,072 restricted stock units into AMTM common shares and a related tax-withholding share disposition of 2,762 shares, all as part of routine equity compensation rather than open-market buying or selling.
What happened to the restricted stock units (RSUs) reported by Amentum (AMTM) Chief Growth Officer?
9,072 restricted stock units converted into an equal number of AMTM common shares upon vesting. Each RSU represents a contingent right to receive one AMTM share, and vesting triggers this distribution as part of the company’s stock-based compensation program.
How many restricted stock units does the Amentum (AMTM) Chief Growth Officer still hold?
Following the vesting transaction, the Form 4 shows that Sean Thomas Mullen holds 9,073 restricted stock units. These RSUs are scheduled so that one-half vests and is delivered at the 18‑month anniversary and the three‑year anniversary of the original grant date.
Are the Amentum (AMTM) RSU vesting terms time-based for the Chief Growth Officer?
Yes. The filing states that one-half of the restricted stock units will vest and be delivered on the 18‑month anniversary of the grant date, with the remaining half vesting and being delivered on the three‑year anniversary, reflecting time-based vesting conditions.
AI-generated analysis. How Rhea-AI works. Not financial advice.
