Amentum: 3,000 New Jobs Fueled by UK Nuclear and Defense Expansion

09/18/2025 – 10:17 AM

LONDON – Amentum (AMTM), a global player in advanced engineering and technology solutions, announced today a significant expansion of its operations in the UK, planning to create 3,000 new jobs over the next four years. This strategic move comes amid growing demand in both the nuclear power and defense sectors within the UK.

Amentum nuclear lab employee

The announcement follows discussions between Amentum CEO John Heller, U.S. President Donald Trump, and UK Prime Minister Sir Keir Starmer, highlighting the pivotal role of transatlantic partnerships in driving economic growth and technological advancement.

“The energy resilience and national security of both nations hinge on continued leadership and innovation in energy and technology,” stated Heller. “These governmental commitments fuel Amentum’s growth and investment strategy, bolstering innovation, job creation, and skill development across both the U.S. and the UK.”

Amentum is currently a key partner in the development of new nuclear power stations in the UK, specifically Hinkley Point C and Sizewell C, and is also engaged in providing technical and project solutions for small modular reactors (SMRs) and fusion energy research. The company’s involvement underscores the increasing interest and investment in alternative energy sources amid global efforts to decarbonize and diversify energy portfolios.

This expansion coincides with an increasing momentum behind nuclear energy worldwide, particularly in the UK and US, spurred by policy initiatives aimed at revitalizing nuclear power generation. Analysts point to a renewed focus on nuclear as a stable and low-carbon energy source, crucial for meeting ambitious climate targets and ensuring energy security in a volatile geopolitical landscape. Furthermore, the burgeoning SMR market potentially offers more flexible and scalable solutions compared to traditional large-scale nuclear plants, attracting further investment and innovation.

“We are intensifying collaboration between our teams on both sides of the Atlantic to capitalize on opportunities specifically tailored for our capabilities,” noted Mark Whitney, president of Amentum Energy & Environment. “Based on current projections, we anticipate a 50% increase in our UK workforce over the next four years. This will be supported by strategic investments in digital engineering, artificial intelligence (AI), and automation to improve the delivery of critical infrastructure and government programs in both the UK and the U.S.”

Beyond nuclear power, Amentum also has a critical role in UK national defense, providing safety and technology services for the Royal Navy’s submarine fleet. The company manages and maintains the UK’s defense training estate for the Defence Infrastructure Organisation and provides program management and engineering support for the Atomic Weapons Establishment.

This dual focus on nuclear energy and defense positions Amentum strategically within the UK market; these investments reflect a broader trend of technology convergence within these sectors. Cybersecurity, AI, and advanced materials are increasingly vital components in both nuclear power plant operations and national defense systems, creating synergies for companies with expertise in both areas.

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. Headquartered in Chantilly, Virginia, the company has more than 53,000 employees in approximately 80 countries across all 7 continents.

About Amentum in the UK

With more than 6,000 people in the UK, Amentum is the delivery partner for programme, project and construction management services at Hinkley Point C; sole programme and project management delivery partner at Sizewell C; and 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’s specialist teams also assist procurement and operational delivery of goods and services across the whole of the UK Ministry of Defence.

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.