| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Fpc Security Ltd. | SC167041 | 01/03/2008 | Dissolved |
| G4S (NORTHERN IRELAND) LIMITED | NI015861 | 01/09/2004 | Dissolved |
| G4S AVANT-GUARD RESOURCE SERVICES (UK) LIMITED | SC191319 | 01/03/2008 | Dissolved |
| G4S KEYHOLDING (UK) LIMITED | 03169816 | 20/12/2007 | Dissolved |
| G4S MONITORING SERVICES (NI) LIMITED | NI028177 | 18/01/2013 | Dissolved |
| G4S ROCK STEADY EVENT SERVICES (UK) LIMITED | SC261061 | 01/03/2008 | Dissolved |
| G4S ROCK STEADY SECURITY (UK) LIMITED | SC103932 | 01/03/2008 | Dissolved |
| G4S ROCK STEADY SPORTS EVENT SERVICES (UK) LIMITED | SC261058 | 01/03/2008 | Dissolved |
| G4S SECURITY SYSTEMS (NI) LIMITED | NI014767 | 01/09/2004 | Dissolved |
| G4S SPECIAL EVENTS SECURITY (UK) LIMITED | 03735365 | 31/01/2007 | Dissolved |
| G4S TRUSTEES LIMITED | 09959550 | 05/05/2023 | Silver |
| G4S WACKENHUT (UK) LIMITED | 01105859 | 01/09/2004 | Dissolved |
| International Maritime Security Ltd | 01989329 | 01/07/2005 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| G4S ADI GROUP LIMITED | 02831083 | 02/11/2005 | 19/05/2015 | Dissolved |
| G4S AVIATION SERVICES (UK) LIMITED | 02837136 | 08/08/2002 | 28/09/2007 | One Red Flag |
| G4S FIRE & SECURITY SYSTEMS LIMITED | NI035946 | 25/11/2011 | 19/05/2015 | Dissolved |
| G4S GOVERNMENT SERVICES LIMITED | 01450669 | 18/01/2013 | 19/05/2015 | Dissolved |
| G4S GURKHA SERVICES (UK) LIMITED | 06304482 | 23/04/2009 | 19/05/2015 | Dissolved |
| G4S HOLDINGS 3 (UK) LIMITED | 02380914 | 01/01/2005 | 10/01/2007 | Dissolved |
| G4S MONITORING SERVICES (NI) LIMITED | NI028177 | 01/09/2004 | 22/08/2007 | Dissolved |
| G4S SECURE SOLUTIONS (UK) LIMITED | 01046019 | 08/08/2002 | 19/05/2015 | Gold |
| G4S SECURITY SERVICES (UK) LIMITED | 02380900 | 01/09/2004 | 19/05/2015 | Silver |
| G4S SECURITY SYSTEMS (UK) LIMITED | 01986024 | 05/12/2006 | 14/01/2008 | Dissolved |
| G4S UK HOLDINGS LIMITED | 03892780 | 20/12/2004 | 10/01/2007 | Gold |
| SIGNATURE FLIGHT SUPPORT HEATHROW LIMITED | 03344653 | 11/11/2002 | 26/10/2004 | Dissolved |