Night Security Limited | 31st August 1951 to 27th September 1995 |
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Securicor Neal & Massy Limited | 27th September 1995 to 17th October 1997 |
Securicor (Americas) Limited | 17th October 1997 to 7th October 2010 |
G4S Americas (UK) Limited | 7th October 2010 to current |