Form 4: Amentum CGO Mullen's RSU Vesting & Tax Withholding

Amentum Holdings' Chief Growth Officer, Sean Thomas Mullen, reported the vesting of 4,838 restricted stock units and the subsequent sale of 1,621 shares for tax withholding.

Summary

• Sean Thomas Mullen, Chief Growth Officer of Amentum Holdings, Inc. (AMTM), reported changes in beneficial ownership.
• On November 6, 2025, 4,838 restricted stock units (RSUs) vested, resulting in the acquisition of 4,838 shares of AMTM common stock.
• Concurrently, 1,621 shares of AMTM common stock were disposed of at a price of $21.79 per share to cover tax withholding obligations related to the RSU vesting.
• Following these transactions, Mullen directly beneficially owns 3,217 shares of common stock and 9,678 restricted stock units.

Sentiment

Score: 5

Explanation: The sentiment is neutral as this is a routine insider transaction involving the vesting of restricted stock units and the subsequent sale of shares to cover tax obligations. It reflects a standard part of executive compensation and does not indicate any significant positive or negative operational or financial developments for the company.

Positives

• The vesting of 4,838 restricted stock units represents a conversion of contingent equity awards into actual shares, increasing the Chief Growth Officer's direct ownership in the company (before tax withholding).

Negatives

• The disposition of 1,621 shares for tax withholding reduces the number of shares directly held by the Chief Growth Officer following the RSU vesting.

Future Outlook

This filing does not contain any forward-looking statements or guidance regarding the company's future performance or strategic direction, as it is solely an insider transaction report.

Industry Context

This is a routine insider transaction related to equity compensation and does not provide specific insights into broader industry trends or competitive landscape. Such transactions are common across publicly traded companies as part of executive compensation plans.

Stakeholder Impact

• Shareholders: Minimal direct impact as this is a routine insider transaction related to compensation, not a discretionary sale indicating a change in confidence.
• Employees: No direct impact mentioned.
• Customers: No direct impact mentioned.
• Suppliers: No direct impact mentioned.
• Creditors: No direct impact mentioned.

Key Dates

Recommendation

This Form 4 filing details a routine insider transaction involving the vesting of restricted stock units and the sale of shares for tax withholding. Such events are standard components of executive compensation and do not typically signal a change in the company's fundamental outlook or operational performance. Therefore, it provides no new information that would warrant a change in investment recommendation; a 'hold' stance is appropriate based solely on this filing.

Keywords

Amentum Holdings, AMTM, Form 4, Insider Transaction, Restricted Stock Units, RSU Vesting, Chief Growth Officer, Equity Compensation, Tax Withholding