Facts

G4S plc (formerly Group 4 Securicor) is a British multinational security services company headquartered in London, England. G4S is the world's largest security company measured by revenues. It has operations in more than 90 countries.[5] With over 570,000 employees,[6] 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.[7][8] G4S has a primary listing on the London Stock Exchange and is a constituent of the FTSE 250 Index.

Source: Wikipedia