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| Company name | Primary business area | Primary coverage | |
|---|---|---|---|
| BQT Solutions (UK) Ltd | Access control | Global | |
| Fastlane Turnstiles | Gates and barriers | United Kingdom (UK) | |
| SMi Group Ltd. | Exhibition and conference organising | United Kingdom (UK) | |
| 1st Choice CCTV | CCTV | United Kingdom (UK) | |
| 24/7 Close Protection Ltd | Physical security | United Kingdom (UK) | |
| 247webvision | CCTV | United Kingdom (UK) | |
| 4Site Online Ltd. | Integrated security | Western Europe | |
| 6 Alpha Associates Ltd | CCTV | United Kingdom (UK) | |
| A2Z Security Group | Integrated security | United Kingdom (UK) | |
| AAC Mechanical & Electrical | CCTV | United Kingdom (UK) | |
| AB Connect Associates Ltd | Consulting services | United Kingdom (UK) | |
| Able Security Concepts Ltd | Manned guarding | United Kingdom (UK) | |
| ACCTIV8 | Intruder alarm | United Kingdom (UK) | |
| Activator UK | IP networking products | United Kingdom (UK) | |
| AD Porta Security | Manned guarding | United Kingdom (UK) | |
| ADB Alarms Ltd | Intruder alarm | United Kingdom (UK) | |
| ADC Consultancy Ltd | Access control | United Kingdom (UK) | |
| ADi security and surveillance | CCTV | United Kingdom (UK) | |
| Adilec Enginyeria | Communication equipments | Sweden | |
| ADL Fire and Security Ltd | CCTV | United Kingdom (UK) | |
| ADT | Integrated security | Global | |
| ADT Fire and Security Plc | CCTV | United Kingdom (UK) | |
| Advance Fire Services | Fire Alarms | United Kingdom (UK) | |
| Advance Peripheral Systems Ltd | Intruder alarm | United Kingdom (UK) | |
| Advance Security UK Ltd | Manned guarding | United Kingdom (UK) | |
| Advanced Biometrics Inc. | Biometrics | Global | |
| Advanced Security Partners Ltd | Consulting services | United Kingdom (UK) | |
| Advanced Vision Systems | CCTV | United Kingdom (UK) | |
| Aerocodic Ltd | CCTV | Portugal | |
| AFRISEC, LLC | Integrated security | Global | |



