Form 4: Amentum COO Arnette's Stock Transactions

Amentum Holdings' Chief Operating Officer, Stephen A. Arnette, reported transactions involving common stock and restricted stock units, including vesting, tax withholding, and a new grant.

Summary

• Stephen A. Arnette, Chief Operating Officer of Amentum Holdings, Inc. (AMTM), reported several transactions on November 17, 2025.
• 1,178 shares of AMTM common stock were distributed upon the vesting of restricted stock units.
• 287 shares of AMTM common stock were tendered for tax withholding at a price of $21.49 per share.
• A new grant of 46,769 restricted stock units (representing a contingent right to receive one share of common stock each) was awarded at a price of $0.
• Following these transactions, Arnette beneficially owns 93,725 shares of AMTM common stock directly.
• The newly granted restricted stock units will vest in one-third increments on the first, second, and third anniversaries of November 17, 2025.

Sentiment

Score: 7

Explanation: The filing indicates routine executive compensation activities, including a new grant of restricted stock units, which aligns management's interests with shareholders. The disposition for tax withholding is a standard practice and does not suggest negative sentiment.

Positives

• The vesting of 1,178 restricted stock units indicates a realization of previously granted equity compensation for the Chief Operating Officer.
• A new grant of 46,769 restricted stock units demonstrates continued equity incentive for the Chief Operating Officer, aligning his interests with shareholders for long-term value creation.

Negatives

• 287 shares of common stock were disposed of for tax withholding, which slightly reduces the direct beneficial ownership in the short term.

Future Outlook

The new grant of 46,769 restricted stock units, vesting over three years, indicates a continued long-term equity incentive structure for the Chief Operating Officer, aligning his future performance with shareholder returns.

Management Comments

• The filing does not contain direct quotes or paraphrased statements from company management, as it is a transactional report of beneficial ownership changes.

Industry Context

This filing is an insider transaction report, which is a routine disclosure for publicly traded companies regarding executive equity compensation. It does not directly relate to broader industry trends but reflects standard practices for incentivizing key management personnel.

Comparison to Industry Standards

• The reported transactions, including the vesting of restricted stock units and the subsequent tax withholding, along with a new RSU grant, are standard components of executive compensation packages across various industries. This aligns with common practices for retaining and incentivizing senior leadership.

Related Party Transactions

• Grant of 46,769 restricted stock units to Chief Operating Officer Stephen A. Arnette as part of his compensation package.

Stakeholder Impact

• Shareholders: The equity compensation structure aims to align the Chief Operating Officer's financial interests with long-term shareholder value creation.
• Employees: The filing reflects standard executive compensation practices within the company.

Next Steps

• The newly granted restricted stock units will vest in one-third increments on the first, second, and third anniversaries of November 17, 2025.

Key Dates

Recommendation

This Form 4 details routine equity compensation for a key executive, including RSU vesting and a new grant. Such transactions are standard and do not typically signal a fundamental change in the company's prospects or valuation. Therefore, a 'hold' recommendation is appropriate as the filing provides no new information to alter an existing investment thesis.

Keywords

Amentum Holdings, AMTM, Stephen A. Arnette, Chief Operating Officer, Form 4, Insider Trading, Restricted Stock Units, Equity Compensation, Stock Vesting, Tax Withholding