Group 4 Securicor is a British multinational security services company headquartered in London, England.
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.
G4S is the world's largest security company measured by revenues. It 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. G4S has a primary listing on the London Stock Exchange and is a constituent of the FTSE 250 Index.
The company has been criticized and involved in numerous controversies.
In December 2020, the G4S Board of Directors and shareholders accepted a takeover offer of $5.1 Billion USD from Allied Universal. The combined companies will employ more than 750,000 people globally and share revenues of more than $18 Billion USD.