5 Biggest Private Security Companies in the World

3. Amentum

2021 Revenue: $6.4 billion

Amentum, previously known as Amentum Government Services Holding LLC, is an American commercial services contractor based in Germantown, Maryland. The company was formed in 2020 from the spinout of AECOM’s Management Services / federal group. A leading contractor to the U.S. federal government and select allied national governments, the company aids in projects of critical national significance across defense, security and intelligence, energy, and environmental cleanup. As part of its business strategy, Amentum has been pursuing acquisitions of other notable government contractors and private security firms, including DynCorp and PAE.