Amentum Joint Venture Selected for Australia Nuclear Submarine Shipyard Program

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nuclear-powered submarines technical

Nuclear-powered submarines are naval vessels that use on-board nuclear reactors for propulsion and electricity, allowing them to operate underwater for months without refueling. For investors they matter because they drive long-term government defense spending, create demand for specialized suppliers and maintenance contracts, and concentrate technological and regulatory risk—similar to owning stakes in companies that build and service highly complex, long-lived industrial machinery.

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An entity (a company, organization, or sometimes an individual) that holds formal permission from a government nuclear regulator to operate nuclear facilities or to possess, use, transport, or store radioactive materials. Think of it like a licensed driver for complex and tightly controlled equipment: the licensee is legally responsible for safety, regulatory compliance, inspections, and any cleanup or liability obligations. That status matters to investors because obtaining, maintaining, or losing a license affects a business’s ability to operate, its costs, exposure to fines or shutdowns, and overall regulatory risk.

commissioning technical

Commissioning is the process of officially starting or activating a new project, system, or facility after it has been built or prepared. It involves testing and checking that everything functions correctly and safely before it begins full operation. For investors, commissioning signals that a project or asset is moving closer to generating value or revenue, which can impact its potential profitability and timing of returns.

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CHANTILLY, Va.--(BUSINESS WIRE)-- Australian Naval Infrastructure (ANI) selected a joint venture between Amentum (NYSE: AMTM) and Laing O’Rourke as its Capability Partner to support the delivery of a nuclear-powered submarine construction yard in South Australia.

Osborne Naval Shipyard, South Australia

Under a long-term contract, Amentum and Laing O’Rourke will play a central role in developing the new shipyard at Osborne, north of Adelaide, where Australia’s nuclear-powered submarines will be built as part of the AUKUS trilateral agreement.

“Amentum has the opportunity to be part of a once-in-a-generation national endeavor that will shape Australia’s sovereign nuclear capability for decades,” said Mark Whitney, president of Amentum Energy & Environment. “We bring more than 60 years of global expertise in nuclear submarine programs, significant nuclear licensee experience, independent regulator exposure and a clear pathway for growing enduring Australian nuclear capability.”

“Our team will provide hands-on leadership across key areas of delivery, including governance, assurance, logistics, commissioning, digital engineering, supply chain quality, and integrating construction expertise into the design phase,” said Kim Katheklakis, Amentum Australia managing director.

The Capability Partner will provide nuclear-related program management, construction management and safety leadership within ANI’s Integrated Delivery Office. The partnership will collaborate closely with ANI to coordinate work packages, support contractor engagement and ensure seamless interface management across the nuclear and non-nuclear areas of the submarine construction yard.

The new construction yard will enable Australia to build and sustain conventionally armed, nuclear‑powered submarines for the first time. It will house the advanced facilities required for assembly, outfitting, testing and commissioning of the future SSN‑AUKUS fleet.

This project is critical to strengthening Australia’s long‑term national security, deepening defense industrial capability, and creating thousands of highly skilled jobs in South Australia. As part of the AUKUS partnership with the United States and United Kingdom, the program will position Australia as a key contributor to stability in the Indo‑Pacific region.

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.

In Australia, Amentum has more than 1,000 team members delivering engineering, program and project management services to government and commercial clients in a range of sectors including defense and national security, cyber and digital, energy and environment, and critical infrastructure. With the AUKUS program accelerating, we are growing our team and capabilities to support the establishment of sovereign nuclear capability in Australia – from the construction of nuclear-licensed facilities and nuclear-powered submarines to through-life operations, decommissioning, disposal, cleanup, and radioactive waste management.

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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.

View source version on businesswire.com: https://www.businesswire.com/news/home/20260723015342/en/

Media Contact:
Alisha Welch
Alisha.Welch@global.amentum.com

Investor Contact:
Joseph DeNardi
IR@amentum.com

Source: Amentum