G4S plc

he company was set up in July 2004 when London-based Securicor amalgamated with Danish firm 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 services. G4S is the world's largest security company measured by revenues. It has operations in more than 85 countries.[4] With over 533,000 employees,[2] by 2012 it was the largest European and African private employer