Amentum (NYSE:AMTM), a global advanced engineering and technology company, has been named to the Fortune 500 list at the #313 position. The Fortune 500, published annually by Fortune magazine, ranks the largest U.S. corporations based on total revenue for the previous fiscal year.

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2026 Fortune 500

"Amentum's inclusion on the Fortune 500 is a testament to the dedication of our 50,000 employees in more than 70 nations, as well as the enduring and trusted relationships forged with our customers and partners," said John Heller, Amentum chief executive officer. "By delivering innovative, technologically advanced solutions in national security, energy, space, intelligence, and infrastructure, we are addressing today's challenges and leading these critical industries into the future."

"This milestone in Amentum's history is about more than financial performance. It demonstrates our commitment to innovation, operational excellence, and problem-solving on a global scale," said Travis Johnson, Amentum chief financial officer. "As we grow, we remain steadfast in our commitment to delivering innovative advanced engineering and technology solutions to solve the most significant and complex challenges in science, security and sustainability."

About Amentum

Amentum is a global leader in advanced engineering and innovative technology solutions, trusted by the United States and its allies to address their most significant and complex challenges in science, security and sustainability. Our people apply undaunted curiosity, relentless ambition and boundless imagination to challenge convention and drive progress. Our commitments are underpinned by the belief that safety, collaboration and well-being are integral to success. Headquartered in Chantilly, Virginia, we have approximately 50,000 employees in more than 70 countries across all 7 continents.

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Forward-Looking Statements

This press release contains or incorporates by reference statements by Amentum Holdings, Inc. (the "Company") that relate to future events and expectations and, as such, constitute "forward-looking statements" as that term is defined in the Private Securities Litigation Reform Act of 1995 and other federal securities laws. These forward-looking statements may be characterized by terminology such as "believe," "project," "expect," "anticipate," "estimate," "forecast," "outlook," "target," "endeavor," "seek," "predict," "intend," "strategy," "plan," "may," "could," "should," "will," "would," "will be," "will continue," "will likely result," or the negative thereof or variations thereon or similar terminology generally intended to identify forward-looking statements. All statements, other than historical facts, including, but not limited to, statements regarding the anticipated work and revenue under the awarded contract, and the Company's objectives, expectations and intentions, applicable legal, economic and regulatory conditions, and any assumptions underlying any of the foregoing, are forward-looking statements.

A number of important factors could cause actual results to differ materially from those contained in or implied by these forward-looking statements, including those factors discussed in our filings with the Securities and Exchange Commission (SEC), including, among others: the occurrence of an accident or safety incident; the ability of the Company to control costs, meet performance requirements or contractual schedules; and other factors set forth under Item 1A, Risk Factors in our Annual Report on Form 10-K for the fiscal year ended September 27, 2024, which can be found at the SEC's website at www.sec.gov or the Investor Relations portion of our website at www.amentum.com. Any forward-looking statement speaks only as of the date on which it is made, and the Company assumes no obligation to update or revise such statement, whether as a result of new information, future events or otherwise, except as required by applicable law.

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Media Contact:

Chanel Mann

Chanel.Mann@amentum.com

Investor Contact:

Joseph DeNardi

IR@amentum.com