Welcome to our dedicated page for Amentum Holdings SEC filings (Ticker: AMTM), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
The Amentum Holdings, Inc. (NYSE: AMTM) SEC filings page on Stock Titan provides access to the company’s official regulatory disclosures as filed with the U.S. Securities and Exchange Commission. These documents are a primary source of information on Amentum’s financial performance, governance, risk factors and executive compensation as an advanced engineering and technology company serving U.S. and allied government markets.
Investors can review annual reports on Form 10-K and quarterly reports on Form 10-Q for detailed discussions of segment performance in Digital Solutions and Global Engineering Solutions, contract backlog, cash flow, and other key metrics. Earnings-related Form 8-K filings, such as those furnished in connection with fiscal year 2025 and interim quarters, include press releases that summarize results and outline factors driving revenue and adjusted EBITDA across Amentum’s government-focused programs.
The company’s DEF 14A definitive proxy statement provides extensive information on corporate governance, the composition and responsibilities of the board of directors, committee structures, and compensation programs for named executive officers. It also describes matters submitted to stockholders at the annual meeting, including director elections, ratification of the independent registered public accounting firm and the advisory vote on executive compensation.
Through this page, users can also monitor other current reports and, where applicable, insider-related filings such as Forms 3, 4 and 5 that disclose transactions by directors and officers. Stock Titan enhances these filings with AI-powered summaries that highlight key points, explain complex sections in plain language and help readers quickly identify items such as changes in guidance, notable contract developments, or governance updates.
Filings are updated in near real time as they appear on the SEC’s EDGAR system, allowing investors, analysts and other stakeholders to follow Amentum’s regulatory history, understand the drivers of its space, defense, nuclear and digital infrastructure work, and assess how governance and compensation practices align with disclosed performance.
The Vanguard Group filed Amendment No. 3 to a Schedule 13G reporting zero beneficial ownership of Amentum Holdings Inc common stock. The amendment explains an internal realignment on January 12, 2026 that caused certain Vanguard subsidiaries to disaggregate holdings, and states The Vanguard Group no longer has beneficial ownership of securities held by those subsidiaries.
The filing lists 0 shares and 0% beneficial ownership, and is signed by Ashley Grim, Head of Global Fund Administration, dated 03/26/2026.
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.