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Big legacy. Bigger future.

Our history

On Feb. 1, 2020, Amentum was born out of the federal business of AECOM, as a culmination of over 100+ years of delivering results for our clients.

This part of our origin stem from four primary lineages – EG&G, Westinghouse Government Services, Washington Group International, Lear Siegler Services, and Apptis. Together, these companies provide nuclear energy solutions, infrastructure, national security, as well as operations and maintenance. This group was brought together by engineering and infrastructure giant URS Corporation which was in turn purchased by AECOM in 2014. AECOM had previously acquired several players in the federal space including SSI (international development) and McNeil Technologies (infrastructure / intel community)

Our energy lineage, acquired via Washington Group International, includes companies such as Morrison Knudsen that began providing infrastructure work at the turn of the 20th century. Westinghouse Government Services and EG&G trace their lineage back to the Manhattan Project. Lear Siegler helped maintain the fighting force during the Cold War.

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Our big future

Amentum is a premier global leader in designing, engineering, managing and modernizing critical systems and programs of national significance across defense, security, intelligence, energy, and environment. Driven to create a safer, smarter, cleaner world, we innovate as a team of inventive doers passionate about making a difference.

Underpinned by a strong culture of ethics, safety and inclusivity, Amentum is fiercely committed to operational excellence, mission focus, and successful execution.

We have more than 35,000 employees in 79 countries on all seven continents. We believe in fostering a sense of belonging, welcoming diversity, including all perspectives and contributions, and providing equal access to opportunities and resources for everyone.

Our celebrated values

Fierce commitment:

We deliver on our promises and are accountable to our teams, customers, company, and communities. No matter the challenge, we work safely, with mission success the only acceptable outcome.

Trailblazing solutions:

We innovate as a team of curious and inventive doers who are passionate about making a difference in an ever-changing world.

Unwavering integrity:

We act ethically, and we expect everyone on our extended team to act honorably. We do the right thing—always.

Inclusion and collaboration:

We respect each other, build trust, welcome ideas, and believe strongly in developing our people.

Awards & industry recognition

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