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Amentum selected for upgrades to UK's energy grid. September 2, 2026 * Mark Fletcher Amentum has been selected for strategic positions on two significant UK energy frameworks awarded by Scottish and Southern Electricity Networks (SSEN) Transmission. Amentum will be the exclusive provider of high-end cybersecurity engineering services which aim to digitize and enhance the security of the United Kingdom's energy grid. SSEN Transmission is the owner and operator of the high-voltage electricity transmission system for the north of Scotland, powering the clean-energy transition and delivering a reliable, efficient network that creates lasting benefits for communities, the economy and the environment. Secure by design. "SSEN Transmission is expanding the grid at a pace the UK's energy security depends on, and that growth must be secure by design," said Matthew Morgan, UK-based group director for Security, Systems and Integration at Amentum. "Its teams will protect critical assets, scale digital capability and turn operational data into faster, better decisions. "We are investing in our team in Scotland to deliver this work, backed by Amentum's deep UK and international experience." Working from offices in Cardiff, Glasgow, London and Warrington, Amentum will build upon existing security architecture work the company has performed for SSEN Transmission since 2022. Digital transformation. Under three-year agreements, Amentum will leverage its expertise in digital transformation, operational technology (OT) and renewable energy integration to support the UK's energy transition goals. "The Five Eyes cyber security agencies have recognized the impact of AI in accelerating the speed, scale and sophistication of cyber threats. Leveraging Amentum's proven expertise in modernizing and securing critical digital infrastructure, we can support SSEN Transmission in addressing one of the most serious challenges of our time," said Jennifer Walsmith, president of Intelligence & Cyber at Amentum. "We look forward to delivering the innovation and security needed to strengthen the UK's energy future." 92% probability of a major attack on UK battery energy storage. State of play: Europe's door intercom market. Secured by Design welcomes KYNEKT as a new member.

Dan Driscoll resigns as Army secretary. * Dan Driscoll has submitted his resignation as Army secretary * The Army will lack a Senate-confirmed civilian or military leader after his exit * Driscoll has served as Army secretary since February 2025 Breaking Defense reported that two Army officials confirmed the resignation, with one official saying Driscoll tendered it following a conversation with Trump about the state of the Army. WSJ reported that Driscoll's exit follows a period of reported tension with Secretary of War Pete Hegseth, a two-time Wash100 honoree, over the Army's direction. Who could succeed Driscoll? Breaking Defense reported that a replacement had not been immediately named, though an Army official told the outlet that the undersecretary position, currently held by Michael Obadal, also a 2026 Wash100 honoree, would typically be next in line for the role. The same official told Breaking Defense that Obadal and Hegseth maintain a positive working relationship. What did the White House say about Driscoll's tenure? "Secretary Driscoll has been highly effective in advancing President Trump's agenda to Make America Strong Again at the Department of the Army by providing outstanding leadership during historic military operations, restoring an emphasis on readiness and lethality, assisting with negotiations between Russia and Ukraine, and more," Anna Kelly, a spokesperson for the White House, said in a statement to WSJ. "The United States Army is more powerful than ever thanks to his work alongside the Commander-in-Chief and Secretary of War," Kelly added. Who is Dan Driscoll? Driscoll is a former Army officer and business executive who has served as secretary of the Army since February 2025, following his nomination and Senate confirmation. In the role, he has overseen operations, modernization and resource allocation for nearly 1 million active, guard and reserve soldiers and more than 265,000 Army civilians. He was commissioned in 2007 as an armor officer, led a cavalry platoon in the 10th Mountain Division at Fort Drum, New York, and deployed to Baghdad in support of Operation Iraqi Freedom in 2009. Driscoll holds a bachelor's degree in business administration from the University of North Carolina at Chapel Hill and a Juris Doctor from Yale Law School. Before joining the Army secretary role, he held leadership positions in investment banking and private equity, including chief operating officer of a $200 million venture capital fund. What has Driscoll accomplished as Army secretary? More recently, Driscoll signed a memo directing the Army to prioritize commercially available software over custom-built systems, extending a broader restructuring effort he had outlined earlier in the year under the Army Transformation Initiative. Julie Barth, a former Amentum executive, has joined Alpha Omega as SVP of business development, bringing over 30 years of... Jurenko most recently worked at Firefly Aerospace, where he was director of hypersonic and strategic defense programs. The FAA has posted a solicitation for supporting the system that manages the NAS Integration Support Contract IV.

Amentum selected for projects to upgrade and protect the UK energy grid. September 1, 2026 - Company to Deliver Digital and Cybersecurity Solutions to Boost Grid Resilience CHANTILLY, Va., Sept. 1, 2026 - Amentum (NYSE: AMTM), a global leader in advanced engineering and technology solutions, has been selected for strategic positions on two significant UK energy frameworks awarded by Scottish and Southern Electricity Networks (SSEN) Transmission. Amentum will be the exclusive provider of high-end cybersecurity engineering services which aim to digitize and enhance the security of the United Kingdom's energy grid. SSEN Transmission is the owner and operator of the high voltage electricity transmission system for the north of Scotland, powering the clean energy transition and delivering a reliable, efficient network that creates lasting benefits for communities, the economy and the environment. "SSEN Transmission is expanding the grid at a pace the UK's energy security depends on, and that growth must be secure by design," said Matthew Morgan, UK-based group director for Security, Systems and Integration at Amentum. "Our teams will protect critical assets, scale digital capability, and turn operational data into faster, better decisions. We are investing in our team in Scotland to deliver this work, backed by Amentum's deep UK and international experience." Working from offices in Cardiff, Glasgow, London, and Warrington, Amentum will build upon existing security architecture work the company has performed for SSEN Transmission since 2022. Under three-year agreements, Amentum will leverage its expertise in digital transformation, operational technology (OT), and renewable energy integration to support the UK's energy transition goals. "The Five Eyes cyber security agencies have recognized the impact of AI in accelerating the speed, scale and sophistication of cyber threats. Leveraging Amentum's proven expertise in modernizing and securing critical digital infrastructure, we can support SSEN Transmission in addressing one of the most serious challenges of our time," said Jennifer Walsmith, president of Intelligence & Cyber at Amentum. "We look forward to delivering the innovation and security needed to strengthen the UK's energy future." 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 7 continents. About Amentum in the United Kingdom With more than 6,000 people in the UK, Amentum is the delivery partner for project and construction management services at Hinkley Point C; sole program and project management delivery partner at Sizewell C; and also supports the UK's existing nuclear power stations under a Lifetime Enterprise Agreement with EDF. It is a major supplier of engineering design, safety case and project management at Sellafield and other UK nuclear decommissioning sites and operates the country's largest private sector complex of nuclear laboratories and engineering test facilities in Warrington. In the defence sector, Amentum has an essential role in the UK's continuous at-sea deterrent by providing safety advice and technology services for the Royal Navy's nuclear submarines and program management and engineering support for AWE. Amentum's specialist teams also assist procurement and operational delivery of goods and services across the whole of the UK Ministry of Defence. Visit Amentum Holdings, Inc. at amentum.com to learn how Amentum Holdings, Inc. advance the future together. Follow Amentum on LinkedIn Contacts: Media Contact: Justin Garrison [email protected] Investor Contact: Joe DiNardi 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 September 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.