G4S

G4S is owned by Allied Universal, headquartered in the United States. Yes. The ultimate owner of G4S, Allied Universal, is headquartered in the United States.

Allied Universal is an American private security and staffing company, formed in 2016 by the merger of AlliedBarton and Universal Services of America. It is the world's largest provider of private security guards and the third-largest U.S.-based employer globally, with 800,000 employees.