Heller John E. 4

What Happened
John E. Heller, CEO of Amentum Holdings (AMTM), had 51,979 restricted stock units (RSUs) vest on January 28, 2026. Those RSUs converted into 51,979 shares of AMTM common stock. To satisfy tax withholding on the vesting, 19,768 of those shares were tendered/withheld, valued at $35.71 per share for a total withholding amount of $705,915. Based on the $35.71 price, the gross value of the vested shares was roughly $1.86 million before withholding.

Key Details

• Transaction date: January 28, 2026 (Form 4 filed January 29, 2026).
• Award/Conversion: 51,979 RSUs vested and converted into 51,979 shares (transaction code M for conversion/exercise).
• Tax withholding: 19,768 shares withheld/tendered at $35.71 per share, proceeds/withholding = $705,915 (transaction code F).
• RSU detail: Each RSU equals one share (footnotes); the RSUs vested on January 28, 2026.
• Shares owned after transaction: Not reported on this Form 4.
• Filing timeliness: The Form 4 was filed the next day (timely); this appears to be routine compensation vesting and tax withholding, not an open-market sale of additional shares.

Context
This was a standard RSU vesting event (A = award / M = conversion), with a portion of shares withheld to cover taxes (F). Such withholding is a routine administrative step and does not necessarily signal buying or selling intent beyond receiving compensation.