Amentum Holdings Inc Form 4 Filings

Amentum Holdings, Inc. Chief Growth Officer Sean Thomas Mullen reported routine equity compensation activity involving restricted stock units and related tax withholding. On May 6, 2026, 9,072 restricted stock units were exercised into an equal number of AMTM common shares, reflecting vesting of stock-based awards.

In connection with this vesting, 2,762 shares of AMTM common stock were tendered to cover tax withholding obligations, a non-market disposition. Following these transactions, Mullen directly held 32,448 shares of AMTM common stock and 9,073 restricted stock units, which vest in two installments on the 18-month and three-year anniversaries of the grant date.

Amentum Holdings, Inc. Chief Financial Officer Travis Barton Johnson reported equity compensation activity in the company’s common stock. On May 6, 2026, restricted stock units representing 13,609 shares of AMTM common stock vested and were delivered. In connection with this vesting, 4,097 shares were tendered to cover tax withholding obligations, a non-market disposition. Following these transactions, Johnson directly holds 118,187 shares of Amentum common stock.

Amentum Holdings Chief Technology Officer Jill L. Bruning exercised 9,072 restricted stock units on May 6, 2026, receiving 9,072 shares of common stock. Of these, 2,731 shares were tendered at $24.89 per share to cover tax withholding. After these equity transactions, she directly holds 197,457 shares of Amentum common stock, including shares acquired under the employee stock purchase plan.

Amentum Holdings, Inc. Chief Operating Officer Stephen A. Arnette reported routine equity compensation activity involving restricted stock units. On May 6, 2026, 13,609 restricted stock units vested and were delivered as the same number of shares of AMTM common stock. Of these, 3,314 shares of common stock were tendered back to the company to satisfy tax withholding obligations, a non‑market disposition. As a result of these transactions, Arnette’s direct holdings increased, with the filing showing 109,966 shares of AMTM common stock held directly after the RSU-related activity.

Amentum Holdings, Inc. Chief Technology Officer Jill L. Bruning reported a disposition of common stock through a bona fide gift. On the reported date, she transferred 30,000 shares of Common Stock at a stated price of $0.0000 per share, described as a gift transfer. After this transaction, she held 190,999 shares of Common Stock in direct ownership.

Amentum Holdings, Inc. Chief Operating Officer Stephen A. Arnette reported equity award activity involving restricted stock units and common shares. On March 2, 2026, 2,808 restricted stock units were converted into 2,808 shares of AMTM common stock at a stated price of $0.00 per share upon vesting.

In connection with this vesting, 750 shares of AMTM common stock were tendered at $30.70 per share for tax withholding, a non-open-market, tax-related disposition. After these transactions, Arnette directly held 96,357 shares of AMTM common stock.

Amentum Holdings, Inc. Chief Legal Officer & GC Michele T. St. Mary reported equity award activity tied to restricted stock units on February 17, 2026. 7,080 restricted stock units vested and converted into the same number of common shares, and 2,308 common shares were withheld to cover taxes. Following these transactions, she directly owned 27,043 shares of common stock and 14,162 restricted stock units.

Amentum Holdings director Susan Leslie Ireland reported a stock grant from the company. On February 6, 2026, she acquired 5,062 shares of common stock at a stated price of $0, bringing her directly held beneficial ownership to 8,509 shares.

According to the footnote, these shares represent restricted stock units that will vest on the date of Amentum’s next annual meeting of stockholders, tying the award to continued board service until that meeting.

Amentum Holdings director Sandra E. Rowland reported stock awards tied to restricted stock units. On February 6, 2026, 11,564 restricted stock units converted into the same number of common shares at $0 per share as they vested. She also received a new grant of 5,062 common shares, also at $0 per share, which are described as restricted stock units that vest on the date of the issuer’s next annual stockholder meeting. After these transactions, she directly owned 20,073 shares of Amentum Holdings common stock.

Amentum Holdings director Brooks Vincent K reported stock-based compensation activity. On February 6, 2026, 11,564 restricted stock units converted into the same number of Amentum common shares at $0 per share upon vesting. A separate award of 5,062 common shares at $0 was also acquired as equity compensation. Following these transactions, Brooks directly owned 27,462 shares of Amentum common stock, reflecting routine director compensation rather than an open‑market purchase or sale.

Amentum Holdings, Inc. director Ralph E. Eberhart reported equity awards and vesting activity dated February 6, 2026. Restricted stock units representing 11,564 shares of AMTM common stock vested and were distributed at a price of $0 per share, leaving no restricted stock units outstanding.

On the same date, he acquired an additional 5,062 shares of common stock at $0, tied to restricted stock units that will vest on the date of the next annual meeting of stockholders. Following these transactions, he directly owned 48,120 shares of AMTM common stock.

Amentum Holdings, Inc. reports updated insider holdings for a director and executive chair on an amended Form 4. The insider is shown as beneficially owning 837,668 shares of Amentum common stock directly and 23,550 shares indirectly through a spouse. A footnote explains that the amounts reflect a non-reportable transfer arising from a pro-rata in-kind distribution of shares by Jacobs Solutions Inc. to its shareholders for no consideration on May 30, 2025, rather than an open-market trade or other purchase or sale.

Amentum Holdings director Barbara Loughran received an equity grant from the company. On 02/06/2026 she acquired 5,062 shares of common stock at a price of $0, increasing her beneficial ownership to 9,662 shares held directly. The grant is in the form of restricted stock units that will vest on the date of Amentum’s next annual meeting of stockholders, aligning a portion of her compensation with the company’s future performance and share value.

Amentum Holdings, Inc. director Christopher M.T. Thompson reported an equity award tied to the company’s common stock. On 02/06/2026, he acquired 5,062 shares of common stock at a price of $0, reflecting a grant of restricted stock units that will vest on the date of the next annual meeting of stockholders.

After the award, Thompson directly beneficially owns 5,062 common shares. The filing also notes indirect beneficial ownership of 14,000 common shares held by his spouse and 10,000 common shares held by a trust.

Amentum Holdings director John C. Vollmer reported equity compensation activity involving the company’s common stock. On February 6, 2026, 11,564 restricted stock units converted into an equal number of common shares at a price of $0 per share, increasing his direct common stock holdings to 424,780 shares. On the same date, he was granted 5,062 additional restricted stock units at $0, which will vest on the date of the next annual meeting of stockholders. Following these transactions, Vollmer directly owned 429,842 shares of Amentum Holdings common stock, while the reported restricted stock unit award tied to this filing had a remaining balance of zero units after vesting.

Amentum Holdings CEO John E. Heller reported stock activity tied to restricted stock units vesting. On January 28, 2026, 51,979 restricted stock units converted into an equal number of common shares. In connection with this vesting, 19,768 common shares were tendered to cover tax withholding at $35.71 per share.

After these transactions, Heller directly holds 366,058 shares of Amentum common stock and 103,959 restricted stock units, each representing a right to receive one share of common stock. The restricted stock units involved in this filing vested on January 28, 2026.

Amentum Holdings, Inc. reports an amended insider ownership filing for its Chief Executive Officer, who also serves as a director. The Form 4/A updates the number of common shares beneficially owned to 333,847 shares held directly after a previously misreported balance.

According to the explanation, the change reflects a non-reportable transfer of shares received from a pro-rata in-kind distribution by Amentum Joint Venture LP to its partners for no consideration at the time of the transaction. The amendment is being filed solely to correct the holding shown in the non-derivative securities table and does not describe a new purchase or sale for cash.

Amentum Holdings, Inc. chief technology officer filed an amended insider ownership report to correct previously reported holdings of company stock. The Form 4/A shows that the officer now directly beneficially owns 220,999 shares of common stock after the update to Table I.

According to the explanation, the change reflects a non-reportable transaction in which shares were transferred through a pro-rata in-kind distribution by Amentum Joint Venture LP to its partners for no consideration as of 11/17/2025. The amendment is described as being made solely to report the correct holding figure, rather than to disclose a new purchase or sale.

Amentum Holdings, Inc. filed an amended insider trading report to correct the share holdings of its Chief Operating Officer. The filing shows that the COO now reports beneficial ownership of 94,299 shares of common stock, held directly after the previously reported transactions dated 11/17/2025. This amended Form 4/A states that the sole purpose of the update is to report the correct holding in Table I, with no new derivative security activity disclosed in Table II.

Amentum Holdings, Inc. Chief Growth Officer reported the vesting of restricted stock units and related tax withholding. On December 17, 2025, 9,298 restricted stock units were converted into an equal number of AMTM common shares, reflecting a scheduled vesting event. On the same date, 4,194 shares of AMTM common stock were tendered to cover tax withholding obligations at a price of $28.67 per share. After these transactions, the officer directly beneficially owns 26,138 shares of AMTM common stock and no remaining restricted stock units from this award.

Amentum Holdings, Inc. Chief People Officer reported routine equity compensation activity involving company stock. On December 5, 2025, 2,721 restricted stock units were converted into the same number of shares of AMTM common stock as they vested. To cover taxes on this vesting, 1,392 shares of AMTM common stock were tendered at a price of $28.88 per share.

After these transactions, the officer directly beneficially owned 23,600 shares of AMTM common stock and held 5,444 restricted stock units, each representing a contingent right to receive one AMTM share. These reported movements reflect standard vesting and tax withholding mechanics rather than open-market buying or selling.

Amentum Holdings, Inc. (AMTM) reported an equity award to its Chief Growth Officer on a Form 4. On November 17, 2025, the officer acquired 17,817 shares of common stock at a price of $0, reflecting a grant of restricted stock units rather than an open-market purchase.

Following this grant, the officer beneficially owns 21,034 shares of Amentum common stock in direct ownership. The award vests over time: one-third of the restricted stock units will vest on each of the first, second and third anniversaries of November 17, 2025, creating a three-year vesting schedule tied to continued service.

Amentum Holdings, Inc. (AMTM) reported that its Chief Executive Officer and director received a grant of 155,897 shares of common stock in the form of restricted stock units on 11/17/2025. The grant was recorded at a price of $0 per share, consistent with equity compensation awards, and brought the CEO’s directly held beneficial ownership to 269,440 shares after the transaction.

According to the vesting terms, one-third of these restricted stock units will vest on each of the first, second, and third anniversaries of November 17, 2025. This schedule means the award is structured to align the CEO’s equity compensation with multi‑year company performance and continued service.

Amentum Holdings, Inc. (AMTM) reported a Form 4 transaction for its Chief Technology Officer. On November 17, 2025, the officer acquired 17,817 shares of common stock, reported at a price of $0, increasing direct beneficial ownership to 21,198 shares.

The footnote explains that these represent restricted stock units, with one-third scheduled to vest on each of the first, second, and third anniversaries of November 17, 2025, creating a three-year, time-based vesting schedule.

Amentum Holdings, Inc. reported an equity award to a senior executive. A Form 4 filing shows that the company’s Chief People Officer acquired 22,271 shares of Amentum common stock on 11/17/2025 in the form of restricted stock units at a price of $0, indicating a compensatory grant rather than a market purchase.

The filing states that one-third of these restricted stock units will vest on each of the first, second, and third anniversaries of November 17, 2025, creating a three-year vesting schedule that ties the award to ongoing service. Following the transaction, the executive beneficially owned 22,271 common shares directly.

Amentum Holdings, Inc. (AMTM) reported an equity grant to its Chief Financial Officer on a Form 4. On November 17, 2025, the CFO acquired 100,220 shares of common stock in the form of restricted stock units at a price of $0 per share, indicating a stock-based compensation award rather than an open-market purchase. Following this grant, the officer beneficially owns 108,675 shares of common stock.

The restricted stock units vest in stages, with one-third of the units scheduled to vest on each of the first, second, and third anniversaries of November 17, 2025. This structure ties the executive’s compensation to the company’s long-term performance and continued service over a three-year period.

Amentum Holdings, Inc. (AMTM) reported an equity grant to its Chief Legal Officer and General Counsel on a Form 4. On November 17, 2025, the officer acquired 22,271 shares of common stock in the form of restricted stock units at a stated price of $0, increasing the amount of securities beneficially owned to 22,271 shares held directly.

According to the filing, these restricted stock units will vest in three equal installments, with one-third vesting on each of the first, second and third anniversaries of November 17, 2025. This transaction reflects routine equity-based compensation for a senior executive rather than an open-market purchase or sale.

Amentum Holdings, Inc. (AMTM) reported an insider equity transaction by its Chief Operating Officer on a Form 4. On November 17, 2025, 1,178 shares of AMTM common stock were distributed upon the vesting of previously granted restricted stock units, and 287 shares were withheld to cover taxes at a price of $21.49 per share. After these transactions, the officer directly owned 46,956 shares of common stock.

On the same date, the officer received a new grant of 46,769 restricted stock units at an exercise price of $0, which will vest in three equal annual installments on the first, second, and third anniversaries of November 17, 2025. Each restricted stock unit represents a contingent right to receive one share of AMTM common stock, aligning the executive’s compensation with future company performance.

Amentum Holdings, Inc. (AMTM) reported insider equity activity by its Executive Chair and director on Form 4 dated 11/17/2025. The insider received 43,396 shares of AMTM common stock upon vesting of previously granted restricted stock units and had 17,077 shares of common stock tendered to cover tax withholding related to that vesting at a price of $21.49 per share. The insider was also granted 111,355 restricted stock units that will vest and be delivered on the first anniversary of November 17, 2025. Following these transactions, the insider beneficially owned 820,476 shares of AMTM common stock directly and 23,550 shares indirectly through a spouse.

Amentum Holdings, Inc. (AMTM) reported insider equity activity by its Chief Operating Officer on a Form 4. On November 15 and 16, 2025, restricted stock units (RSUs) vested, resulting in multiple conversions of RSUs into AMTM common stock, reported with transaction code M. The COO received common shares in amounts including 5,758, 5,053, 3,681, and 4,596 shares as RSUs vested and were distributed as stock. To cover tax withholding upon these vestings, the officer surrendered AMTM common shares in separate transactions with code F, including 1,403, 1,231, and 1,120 shares at a price of $22.07 per share. Following the reported transactions, the COO beneficially owned 46,065 shares of AMTM common stock directly and continued to hold RSUs with contingent rights to receive additional shares.

Amentum Holdings (AMTM) reported an insider equity event by its Chief Financial Officer on 11/06/2025. The CFO received 12,097 shares of common stock upon the vesting of restricted stock units, then disposed of 3,642 shares to cover taxes at $21.79 per share.

Following these transactions, the officer directly holds 8,455 shares of AMTM common stock. The filing also notes 24,194 restricted stock units beneficially owned after the reported activity, each representing the right to receive one share. The vested restricted stock units vested on November 6, 2025.

Amentum Holdings (AMTM) reported an insider equity change by its Chief Technology Officer. On November 6, 2025, 4,838 shares of common stock were delivered upon vesting of restricted stock units. To satisfy taxes, 1,457 shares were withheld at $21.79 per share.

Following these transactions, the CTO directly owns 3,381 common shares. The filing also shows 9,678 restricted stock units remaining outstanding after the vesting event.

Amentum Holdings (AMTM) reported an insider equity transaction by its Chief Executive Officer and Director on November 6, 2025. The executive received 39,617 shares of common stock upon the vesting of restricted stock units, then tendered 17,868 shares for tax withholding at $21.79 per share. Following these transactions, the executive directly owned 113,543 shares of AMTM common stock. In addition, the filing lists 79,236 restricted stock units beneficially owned as derivative securities. These entries reflect routine equity compensation vesting and related tax withholding.

Amentum Holdings (AMTM): Form 4 insider activity. The Chief Growth Officer reported the vesting and settlement of 4,838 restricted stock units into common stock on November 6, 2025. To cover taxes, 1,621 shares were withheld at $21.79 per share (Code F). Following these transactions, the reporting person directly holds 3,217 shares of common stock and 9,678 RSUs remain outstanding. Each RSU represents the right to receive one share.

Amentum Holdings (AMTM) reported an insider equity event. On November 6, 2025, the Executive Chair and Director received 90,727 shares of common stock upon the vesting of restricted stock units.

To cover taxes, 28,818 shares were withheld at $21.79 per share. Following these transactions, the insider held 682,802 shares directly. An additional 23,550 shares were reported as indirectly owned by a spouse. The RSU award vested on November 6, 2025, and the corresponding derivative balance was reduced to zero upon share delivery.

Amentum Holdings (AMTM) reported an insider equity transaction by its Chief Operating Officer. On 11/06/2025, the executive acquired 12,701 shares of common stock through the vesting of restricted stock units (code M). To cover taxes, 3,093 shares were withheld at a price of $21.79 per share (code F). After these transactions, the executive beneficially owned 31,628 common shares directly. The filing also shows 25,404 restricted stock units remaining beneficially owned following the event.