G4S is a British multinational private security company headquartered in London, England. The company was set up in July 2004 when London-based Securicor amalgamated with Danish firm Group 4 Falck. Wikipedia
CEO: Ashley Almanza (Jun 1, 2013–)
Headquarters: London, United Kingdom
Founder: Marius Hogrefe
Founded: July 2004, Copenhagen, Denmark
Parent organizations: Allied Universal and Allied Universal Security Services LLC