A US company employing hundreds in the North East has completed a huge merger deal.

Amentum, which employs nearly 300 people in Stockton and Newcastle, announced the completion of its merger with Jacobs Critical Mission Solutions and Cyber and Intelligence businesses.

Amentum provides engineering design, safety case, control and instrumentation, and project management support for the nuclear industry throughout the UK, including the construction of Hinkley Point C and support for the UK’s existing power stations.

It is also involved in the development of new types of small modular reactors. The Stockton office also serves the defence and renewable energy sectors and provides procurement, construction support and commissioning services.

The new deal creates a global leader in advanced engineering and innovative technology solutions, positioned to address complex challenges.

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Headquartered in Chantilly, Virginia, Amentum is a leading global engineering and technology services business serving the US Government and its allied partners.

The company works across five key markets: environment, space, intelligence, defence and civilian with an extensive scale and global reach, supported by a highly skilled and diverse workforce of more than 53,000 people in 80 countries.

“The completion of this transformational combination creates a global leader that advances the future, with the trusted track record of superior performance, outstanding engineering expertise, and leading-edge technologies required to meet our customers’ most significant challenges,” said Amentum CEO John Heller.

“After a century of success, this is a milestone day for our business, and our employees are excited about the future and to continue our success delivering value for all our stakeholders as a public company.”

Amentum is strategically positioned to serve a $320 billion market and aims to accelerate its growth in high-margin, technology-enabled segments. The company says it expects to generate an estimated $14 billion in revenue in fiscal year 2025.

“Amentum has built a strong foundation of trust as a longstanding partner of choice to the US Government and its allied partners around the world,” said Steve Demetriou, Executive Chair of Amentum.

“We are thrilled to bring together two deeply experienced, skilled and complementary teams with shared cultures of collaboration and innovation to drive growth in a highly attractive industry. I look forward to working with John and the Board to shepherd the next phase of Amentum’s journey.”

The new executive leadership team will be led by John Heller, who will serve as CEO. Dr. Steve Arnette will serve as Chief Operating Officer, Travis Johnson as Chief Financial Officer and Jill Bruning as Chief Technology Officer of Amentum. Steve Demetriou will serve as Executive Chair of the company’s board.

Jacobs’ shareholders will own 51.0% and Jacobs will own 7.5% of the company’s common shares. An additional 4.5% of the company’s common shares will be released in the future depending on the achievement of profit targets.