This is a list of notable private security companies .
Pinkerton is an American private investigation and security company established around 1850 in the United States by Scottish-born American cooper Allan Pinkerton and Chicago attorney Edward Rucker as the North-Western Police Agency, which later became Pinkerton & Co. and finally the Pinkerton National Detective Agency. At the height of its power from the 1870s to the 1890s, it was the largest private law enforcement organization in the world. It is currently a subsidiary of Swedish-based Securitas AB.
G4S Secure Solutions (USA) is an American/British-based security services company, and a subsidiary of G4S plc. It was founded as The Wackenhut Corporation in 1954, in Coral Gables, Florida, by George Wackenhut and three partners. In 2002, the company was acquired for $570 million by Danish corporation Group 4 Falck. In 2010, G4S Wackenhut changed its name to G4S Secure Solutions (USA) to reflect the new business model. The G4S Americas Region headquarters is in Jupiter, Florida.
Securitas AB is a Swedish group devoted to security services, such as security guarding, mobile patrolling, monitoring, investigation and related consulting services. The group is headquartered in Stockholm and had over 300,000 employees in 53 countries worldwide as of 2016. Securitas AB is listed at Nasdaq OMX Stockholm in the Large Cap segment.
A private military company (PMC) or private military and security company (PMSC) is a private company providing armed combat or security services for financial gain. PMCs refer to their personnel as "security contractors" or "private military contractors".
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. 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.
ADT Inc., formerly The ADT Corporation, is an American security company that provides residential and small business electronic security, fire protection, and other related alarm monitoring services throughout the United States. The corporate head office is located in Boca Raton, Florida. In February 2016, the company was acquired by Apollo Global Management for $6.9 billion in a leveraged buyout. In January 2018, the company went public on the New York Stock Exchange.
Allied Universal is an American private security and staffing company, based in Conshohocken, Pennsylvania and Irvine, California. Formed in 2016 by the merger of AlliedBarton and Universal Services of America, Allied Universal is the world's largest provider of private security guards. It is also the third largest United States–based employer globally with 800,000 employees.
Securitas AG is a Swiss company providing security services with head office in Zollikofen, regional offices in Basel, Bern, Geneva, Lausanne, Lugano, Lucerne, Neuchâtel, Olten, St. Gallen, Thun and Zürich as well as 25 other branches all over Switzerland.
Aegis Defence Services is a British private military and private security company with overseas offices in Afghanistan, the United Arab Emirates, Iraq, Saudi Arabia, Libya, Somalia and Mozambique. It is part of the Aegis Group of companies, which includes Aegis LLC, which is based in the United States. It was founded in 2002 by Tim Spicer, who was previously CEO of the private military company Sandline International; Jeffrey Day, an entrepreneur; and Mark Bullough and Dominic Armstrong, former investment bankers.
Chubb Fire & Security is a British multinational company that provides property protection and life safety equipment and services, including fire protection and security systems. It has been a subsidiary of APi Group Corporation since January 2022.
The Communications and Information Services Corps (CIS) – formerly the Army Corps of Signals – is one of the combat support corps of the Irish Defence Forces, the military of Ireland. It is responsible for the installation, maintenance and operation of communications and information systems for the command, control and administration of the Defence Forces, and the facilitation of accurate, real-time sharing of intelligence between the Army, Naval Service and Air Corps branches at home and overseas.
Law enforcement in Switzerland is mainly a responsibility of the 26 cantons of Switzerland, who each operate cantonal police agencies. Some cities also operate municipal police agencies as provided for by cantonal law.
ArmorGroup International is a British company that provides private security services. It was founded in 1981 and was listed on the London Stock Exchange until 6 June 2008.
G4S Secure Solutions is a Serbian security company specialized in guarding, monitoring, cash handling, analyzing-consulting, security education and in sale of security systems.
Verisure, formerly known as Securitas Direct is a security company based in Versoix, close to Geneva in Switzerland and active in 17 countries in Europe and South America. Hellman & Friedman is currently the main shareholder in the group.
Intelligent Limited is a Holding Company and Parent company headquartered in Gloucestershire, United Kingdom and was incorporated on 21 May 2008. Intelligent Limited provides a group management structure for four companies and was born out of the operations of International Intelligence Limited, a company specialising in Intelligence, Counter Espionage and TSCM sweeping.
G4S describes itself as "the world's leading provider of security solutions" and provides security services for over 40 embassies around the world, works as stewards at football stadiums and runs over six British prisons, operates prisoner tagging schemes, assists within the Government Communications Headquarters (GCHQ) in the United Kingdom, and provides administrative roles to the health and education sectors. The company operates as a subsidiary of an American security services provider Allied Universal since April 2021.
The Corps of Commissionaires refers to a movement in Commonwealth countries of societies that provide meaningful employment for veterans of the armed services.