
| Company name | Primary business area | Primary coverage | |
|---|---|---|---|
| Cortech Developments | Software | United Kingdom (UK) | |
| Moxa Technologies, Inc. | IP networking products | United States of America (USA) | |
| 1st Choice CCTV | CCTV | United Kingdom (UK) | |
| 2020 Vision Systems Limited | Integrated security | United Kingdom (UK) | |
| 24/7 Close Protection Ltd | Physical security | United Kingdom (UK) | |
| 3SI Security Systems Ltd | Cash protection systems | United Kingdom (UK) | |
| 4 Tec Security Ltd | CCTV | United Kingdom (UK) | |
| 4i Security | Cards and readers | United Kingdom (UK) | |
| 4Site Online Ltd. | Integrated security | Western Europe | |
| A C Security Solutions Ltd | Digital video recording | Western Europe | |
| Abacus Integrated Systems Ltd | Access control | United Kingdom (UK) | |
| AC Controls Security | CCTV | United Kingdom (UK) | |
| Access Fire and Security Ltd | CCTV | United Kingdom (UK) | |
| Acctive Systems Ltd | CCTV | United Kingdom (UK) | |
| Ace Security Systems Ltd | CCTV | United Kingdom (UK) | |
| Act Security Systems UK Ltd | CCTV | United Kingdom (UK) | |
| ACTAtek Pte. Ltd. | Access control | Singapore | |
| Active Communications | CCTV | United Kingdom (UK) | |
| AD Aerospace Ltd | CCTV | United Kingdom (UK) | |
| ADB Alarms Ltd | Intruder alarm | United Kingdom (UK) | |
| ADi security and surveillance | CCTV | United Kingdom (UK) | |
| ADT | Integrated security | South Africa | |
| ADT Fire and Security | CCTV | United Kingdom (UK) | |
| Advance Fire Services | Fire Alarms | United Kingdom (UK) | |
| Advance Integrated Systems (AIS) | CCTV | United Kingdom (UK) | |
| Advance Integrated Systems PLC | Access control | United Kingdom (UK) | |
| Advance Monitoring Solutions Limited | CCTV | United Kingdom (UK) | |
| Advance Peripheral Systems Ltd | Intruder alarm | United Kingdom (UK) | |
| Advanced Security Developments | CCTV | United Kingdom (UK) | |
| Aegis Security Solutions & Technolgies Ltd. | Intrusion detection | United Kingdom (UK) | |



