G4S

G4S Limited

Company type	Subsidiary
Industry	Security
Predecessors	Group 4 Falck Securicor
Founded	July 2004
Headquarters	London, England, UK
Area served	Worldwide
Key people	John Connolly (Chairman) Ashley Almanza (CEO)
Services	Manned security services, cash handling services, justice services and outsourced business processes related to security and safety risks
Revenue	£7,758 million (2019)[1]
Operating income	£145 million (2019)[1]
Net income	£(80) million (2019)[1]
Number of employees	533,000 (2021)[2]
Parent	Allied Universal
Subsidiaries	G4S Secure Solutions, Hashmira, Argenbright Security, Securicor, Ronco Consulting Corp., AMAG Technology, Wackenhut, Total Security Services
Website	g4s.com

G4S is a British multinational private security company headquartered in London, England.^[3] The 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.^[5][6]

The company has been criticised and involved in numerous controversies. Formerly a dual-listed company with listings on the Copenhagen and London stock exchanges, G4S was purchased by Allied Universal in April 2021.