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| Company name | Primary business area | Primary coverage | |
|---|---|---|---|
| Adax Business Systems W.L.L. | CCTV | Qatar | |
| Al Kawther Security Systems | CCTV | Qatar | |
| Warrior Security Ltd. | Manned guarding | Africa | |
| 4Site Online Ltd. | Integrated security | Western Europe | |
| AAC Mechanical & Electrical | CCTV | United Kingdom (UK) | |
| Aarya Ites Pvt. Ltd. | CCTV | India | |
| Absolute Security Ltd. | CCTV | Kenya | |
| Accent Alarms, Inc | CCTV | North America | |
| Access Systems Integration, LLC | Integrated security | United States of America (USA) | |
| ACCTIV8 | Intruder alarm | United Kingdom (UK) | |
| Acme Security Systems | CCTV | United States of America (USA) | |
| ACMP | CCTV | Global | |
| Acropolis Electronic Security Systems. | Integrated security | India | |
| ACTI-TECH LTD | Access control | Nigeria | |
| Adaar Technology | Integrated security | India | |
| Adax Business Systems | CCTV | Qatar | |
| ADB Alarms Ltd | Intruder alarm | United Kingdom (UK) | |
| ADi security and surveillance | CCTV | United Kingdom (UK) | |
| ADI-ALARMSYSTEM | Intruder alarm | Norway | |
| ADS Security | Central monitoring systems | United States of America (USA) | |
| ADT | Integrated security | Global | |
| 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) | |
| Advanced Security Systems | IP networking products | Mexico | |
| Advantech, Inc. | Consulting services | United States of America (USA) | |
| Aegis Security Solutions & Technolgies Ltd. | Intrusion detection | United Kingdom (UK) | |
| AGE CCTV | CCTV | United Kingdom (UK) | |



