Jill L. Bruning, Chief Technology Officer of Amentum Holdings, Inc. (NYSE:AMTM), filed a Form 4 on November 10, 2026, disclosing transactions in common stock and restricted stock units dated November 6, 2026.

Key Highlights

  • RSU vesting: 4,839 restricted stock units vested and were converted into 4,839 shares of common stock on November 6, 2026, via transaction code M.
  • Tax withholding: 1,457 shares of common stock were tendered for tax withholding upon vesting, at a price of $21.25 per share, via transaction code F.
  • Remaining beneficial ownership: Following both transactions, Bruning directly holds 201,765 shares of common stock.
  • RSU schedule: According to the filing, one-third of the restricted stock units vest and are delivered, net of tax withholding, on each of the first, second, and third anniversaries of the grant date.
  • Remaining derivative position: Bruning retains 4,839 restricted stock units directly following the reported transactions.

Bruning RSU Vesting and Share Withholding at Amentum Holdings

According to the Form 4 filed with the SEC on November 10, 2026, Jill L. Bruning, Chief Technology Officer of Amentum Holdings, Inc. (NYSE:AMTM), reported two transactions in the company's common stock on November 6, 2026. The filing identifies Bruning's address as c/o Amentum Holdings, Inc., 4800 Westfields Boulevard, Suite 400, Chantilly, Virginia 20151.

The first transaction, coded M, reflects the acquisition of 4,839 shares of common stock. The filing states this "represents distribution of AMTM common stock upon vesting of restricted stock units." Following this acquisition, Bruning's direct beneficial ownership stood at 203,222 shares. The second transaction, coded F, reflects the disposition of 1,457 shares at $21.25 per share. The filing states this "represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock units." After this disposition, Bruning's direct beneficial ownership was reported as 201,765 shares.

In Table II, the filing reports that 4,839 restricted stock units were also reduced by the same M-coded vesting transaction. Each restricted stock unit, as described in the filing, "represents a contingent right to receive one share of AMTM common stock." After the transaction, Bruning directly holds 4,839 restricted stock units. The Form 4 was signed by Indira Lall as attorney-in-fact on November 10, 2026.

What Was Disclosed

Amentum Holdings CTO Jill L. Bruning disclosed the vesting of 4,839 restricted stock units into common stock and the withholding of 1,457 shares at $21.25 for taxes on November 6, 2026, leaving her with 201,765 shares held directly.