Amentum Wins $120 Million DISA Computer Processing Contract

Company to Deliver Dynamically Scalable Computing Power, On-Demand

Chantilly, Va., December 9, 2025 — Amentum (NYSE: AMTM), a leader in advanced technology and engineering solutions, has won a $120 million computer processing award from the Defense Information Systems Agency. Through the Z-series chipset Processor Capacity Services contract, Amentum will deliver dynamically scalable computing power for the agency “on-demand.”

“Amentum’s proven ability to manage an entire hardware lifecycle expertly suits DISA’s processing needs. Our processor capacity solution routinely exceeds 99.999% availability, ensuring systems are performing 24/7/365,” said Mark Walter, president of Amentum’s Engineering & Technology Group. “Our track record of delivery excellence in hardware lifecycle solutions over the past two decades has firmly established Amentum as a trusted prime contractor for DISA.”

Under the contract, Amentum will provision and maintain all hardware, software, licensing, and operational services while DISA administers and supports the hosting environment. DISA uses Z-series mainframe chips to support computer processing for its strategic partners. Instead of owning the hardware, the agency purchases computing power capacity based on utility.

“DISA’s on-demand approach to computer processing provides maximum flexibility, value, and mission effectiveness. The service model readily adjusts to changing requirements, including increases and decreases in power usage, allowing DISA to pay only for the computing power it uses,” said Travis Mackland, senior vice president of Digital Transformation for Amentum’s Engineering & Technology business. “Amentum expertise delivers efficient, effective, and reliable solutions to support DISA’s mission.”

The Z-series chipset Processor Capacity Services, or PCS, contract includes a five-year base period with five additional one-year option periods.

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.

Visit us at amentum.com to learn how we advance the future together.

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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.

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