The company was set up in 2004 when London-based company Securicor amalgamated with Danish business Group 4 Falck. The company offers a range of services, including the supply of security personnel, monitoring equipment, response units and secure prisoner transportation. G4S also works with governments overseas to deliver security.
It is the world's largest security company measured by revenues and has operations in more than 90 countries. With over 570,000 employees, it is the world's third-largest private employer, the largest European and African private employer, and among the largest on the London Stock Exchange.[