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Amentum opens Global Nuclear Headquarters in Oak Ridge, Tennessee. October 8, 2026 - CHANTILLY, Va., October 8, 2026 - Amentum today opened its Global Nuclear headquarters in Oak Ridge, Tennessee. The facility, which houses Amentum's Nuclear Center of Excellence, now serves as a centralized hub for the company's international nuclear business operations. Located at 151 Lafayette Drive in Oak Ridge, the hub employs more than 150 subject-matter experts dedicated to delivering innovative engineering, technology solutions and advanced energy capabilities. The facility anchors Amentum's deepening footprint in east Tennessee, where the company already serves as the lead partner in United Cleanup Oak Ridge (UCOR), the U.S. Department of Energy's prime environmental management contractor for the Oak Ridge Reservation. "The opening of our Global Nuclear Headquarters represents a monumental step forward for our business and our industry," said Mark Whitney, president of Amentum's Energy & Environment division. "By centralizing our global nuclear operations in Oak Ridge, we are leveraging strong local partnerships to deliver increased energy capacity to meet the electricity demand of the people and businesses across the U.S. This facility empowers our team of experts to deliver next-generation nuclear innovation, and it builds directly upon the strong operational foundation we've established in the region through our Amentum-led UCOR partnership while contributing directly to regional economic growth." To sustain the industry's rapidly expanding need for professional and technical labor, Amentum simultaneously launched the Amentum Nuclear Scholars Program. This transformational initiative establishes a synchronized scholarship pipeline between Roane State Community College and the University of Tennessee, Knoxville (UTK). The newly founded partnership is headlined by a five-year investment from Amentum totaling $500,000 towards developing curriculum and scholarships that build the critical talent pipeline for the world's growing nuclear energy demands. When combined with other Amentum-led STEM sponsorships and donations in the Oak Ridge community, total student support for these two academic institutions exceeds $1 million. "By launching the Amentum Nuclear Scholars Program alongside our new headquarters, we are directly investing in the local student talent who will pioneer the future of advanced energy and infrastructure solutions," Whitney said. The educational pipeline will launch its first student cohort stateside in late 2026, followed by integration with Amentum's international academic partners in the fall of 2027. To celebrate the opening, Amentum hosted a ribbon-cutting ceremony featuring CEO John Heller, U.S. Rep. Chuck Fleischmann (R-TN-03) local elected leaders and school officials. "This partnership paves the way for students to gain the educational foundation necessary to excel as future leaders in the nuclear industry," said UTK Tickle College of Engineering (TCE) Dean Matthew Mench, the Wayne T. Davis dean's chair of the college. "Through the financial support from Amentum and practical internship experiences, TCE students will be prepared to step directly into high-demand roles that will positively impact our community, state and country." "By partnering with Amentum, we are opening doors for students to start right here in their community and graduate onto a global stage," said Dr. Chris Whaley, Roane State Community College president. "The Amentum Nuclear Scholars Program removes the financial hurdles that often halt a student's momentum, providing a direct, supported pathway from our classrooms straight into high-wage, high-impact careers." 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. Its people apply undaunted curiosity, relentless ambition and boundless imagination to challenge convention and drive progress. Its commitments are underpinned by the belief that safety, collaboration and well-being are integral to success.Headquartered in Chantilly, Virginia, Amentum Holdings, Inc. has approximately 50,000 employees in more than 70 countries across all seven continents. Visit Amentum Holdings, Inc. at amentum.com to learn how Amentum Holdings, Inc. advance the future together. Media contact: Rob Roxburgh (509) 438-1216 Investor contact: Joseph DeNardi 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 its 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 its Annual Report on Form 10-K for the fiscal year ended Sept. 27, 2024, which can be found at the SEC's website at www.sec.gov or the Investor Relations portion of its 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.

One Amentum: celebrating two years as a public company. October 1, 2026 - October 1, 2026, marks an exciting milestone for Amentum: two years as a publicly traded company on the New York Stock Exchange under the ticker symbol AMTM. It has been a transformative journey since its debut in 2024, not just for its company but for the missions Amentum Holdings, Inc. support, the partnerships Amentum Holdings, Inc. has built, and the communities Amentum Holdings, Inc. serve. Two years ago, Amentum became One Amentum by bringing together the combined expertise of approximately 50,000 employees in more than 70 countries. A strategic merger combination allowed Amentum Holdings, Inc. to become a global leader in advanced engineering and innovative technology solutions. Guided by its mission-focused mindset, Amentum aligned its deep technical capabilities and global reach with the pressing needs of its customers: spanning global markets in defense, intelligence, national security, energy, and space. Together, Amentum Holdings, Inc. forged an organization with agility, technical expertise, and innovation needed to tackle its customers' toughest challenges in an evolving world. Milestones Safety remained a top priority, with more than 400 of its global programs recognized for outstanding safety performance by the National Safety Council. Amentum Holdings, Inc. is proud of its recognition as the No. 1 Military Friendly(R) Employer in 2026 and its ongoing support of military families and veterans. This commitment extends to the United Kingdom, where Amentum Holdings, Inc. earned the Ministry of Defence Employer Recognition Scheme Gold Award for supporting the Armed Forces community. Amentum Holdings, Inc. celebrated another major milestone - its debut on the Fortune 500 list at No. 313. Just a month later, TIME named Amentum one of America's Best Companies, citing its financial strength, sustainability practices, and employee satisfaction. These accomplishments underscore the ongoing dedication of its workforce and its commitment to delivering value to customers, stakeholders, and communities. Innovation At Amentum, Amentum Holdings, Inc. know that the future requires constant innovation. Over the past two years, Amentum Holdings, Inc. has expanded its investments in technologies such as AI-powered systems, autonomous capabilities, and smart infrastructure. These tools are helping Amentum Holdings, Inc. deliver cutting-edge solutions for customers on missions ranging from modernizing defense systems and logistics in the Indo-Pacific to advancing U.S. space exploration efforts under NASA programs like Artemis to sustainably powering data centers. Building the Future At the heart of Amentum's success is its people. Their expertise, commitment, and drive are what fuel its ability to anticipate and solve its customers' most complex problems. More than 24,000 employees participated in its first global engagement survey to shape its collective vision for the future. As Amentum Holdings, Inc. look ahead, Amentum is focused on accelerating growth in emerging markets like global nuclear energy, space systems, and critical digital infrastructure. These sectors are critical to tackling some of today's biggest challenges, including energy security, technological advancement, and sustainability. Two years in, Amentum Holdings, Inc. is proud of what Amentum Holdings, Inc. has accomplished, from delivering game-changing solutions for its customers to becoming a recognized leader in multiple sectors. But this is just the beginning. As technology advances and global demands evolve, Amentum is building solutions to advance the future together, for tomorrow.

Trax loses White Sands protest, but judge hits government over AI disclosures. Stay Connected Find opportunities - and win them. By Nick Wakeman , Editor-in-Chief, Washington Technology September 30, 2026 10:28 AM ET The Army tested an artificial intelligence tool on the $450 million competition, and its outputs reached evaluators and the contracting officer. The government did not provide many details on that until the judge pressed. Trax International Corp. may have lost its protest at the U.S. Court of Federal Claims, but the government's lawyers may be in some hot water for not being forthcoming with the judge. Over the summer, Trax challenged the Army's decision to award a $450 million mission support services contract at the White Sands Missile Range in New Mexico to the Southwest Range Services joint venture. SA-Tech, Amentum and EWA Warrior Services are partners in the JV. TRAX laid out several challenges to how the Army conducted evaluations, including the fact that the service branch used artificial intelligence to evaluate proposals. Trax argued that the Army's Fast Track AI tool committed several hallucinations that gave the impression that the proposal by Southwest Range Services was superior to Trax's bid. Judge Carolyn Lerner denied that argument because TRAX could not identify any actual errors in the evaluation that could be traced to the AI tool. Lerner wrote in her Sept. 22 ruling that while she "cannot entirely rule out the use of AI," TRAX needed to show more. But at the same time, the Army drew the judge's ire because their story about how they used the AI tool changed over the course of the case. The judge has written a still-sealed show cause order to force the government to explain itself on the record. The show cause order will not change the outcome for TRAX, but it could result in some sanctions for the attorneys representing the Army. Lerner wants the government to "explain the errors and misrepresentations in its briefing" on TRAX's motion to add the AI evaluations to the record. The dispute over the record began when Trax asked the court to add the AI outputs to the administrative record. The government said a procurement analyst had run the proposals through Fast Track to test whether the tool could be used in future source selections. According to the government, the evaluation board saw only one output from a third unnamed bidder and only on a screen. Board members judged it unusable and none of the outputs were entered into the contract file or used in the decision, the government said. That account did not hold up. When Lerner ordered the Army officials to answer specific questions in supplemental declarations, the procurement analyst acknowledged for the first time that he had also sent the AI evaluations of the TRAX and Southwest Range proposals to three people. Two were members of the evaluation board and the third person was the contracting officer. Lerner called it a "belated admission." She ruled that the AI evaluations need to be in the administrative record because they are "relevant to the process" and bear directly on "Trax's claim that AI-assisted review introduced errors that infected its technical evaluation." Once the AI outputs were in the record, it became clear the board's evaluation of the third bidder contained passages that were nearly sentence-for-sentence identical to the AI-generated evaluation. Lerner has written her show cause order, but the government has asked for more time to submit redactions to the order. Redactions were due Sept. 30 (today) and the judge's response is expected Oct. 13.