Form 4: Amentum Holdings COO Reports Stock Transactions

Stephen A. Arnette, Chief Operating Officer of Amentum Holdings, Inc., reported transactions involving common stock and restricted stock units.

Summary

• Stephen A. Arnette, Chief Operating Officer of Amentum Holdings, Inc. (AMTM), reported a transaction on May 6, 2026.
• This transaction involved the distribution of 13,609 shares of AMTM common stock upon the vesting of restricted stock units.
• Additionally, 3,314 shares of AMTM common stock were tendered for tax withholding purposes upon the vesting of restricted stock units.
• Following these transactions, Arnette beneficially owns 106,652 shares of common stock directly.

Sentiment

Score: 5

Explanation: StockSavvy.ai views this as a neutral filing, as it primarily reports on routine executive compensation events (stock vesting and tax withholding) rather than significant strategic or financial performance changes.

Positives

• Vesting of restricted stock units indicates continued performance-based compensation and potential for future share ownership.
• The COO's direct beneficial ownership of 106,652 shares suggests a significant personal stake in the company's performance.

Negatives

• Tendering of 3,314 shares for tax withholding represents a reduction in the net shares received by the reporting person.

Future Outlook

The filing details the vesting schedule for restricted stock units, indicating that one-half of the units vest on the 18th month and three-year anniversaries of the grant date, suggesting a structured approach to future equity awards.

Industry Context

StockSavvy.ai notes that insider transactions, such as the reporting of stock vesting and tax withholding, are routine disclosures for publicly traded companies and provide transparency into executive compensation and potential selling pressure.

Stakeholder Impact

• Shareholders: The tendering of shares for tax withholding could represent a minor selling pressure on the stock, though this is a common practice for executives.

Next Steps

• Continued vesting of restricted stock units according to the specified schedule (18th month and three-year anniversaries of grant date).

Key Dates

Keywords

Amentum Holdings, AMTM, Form 4, Insider Transaction, Stock Vesting, Restricted Stock Units, Beneficial Ownership, Chief Operating Officer, Tax Withholding