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| Company name | Primary business area | Primary coverage | |
|---|---|---|---|
| AD Aerospace Ltd | CCTV | United Kingdom (UK) | |
| Telexper International Inc. | CCTV | Global | |
| AATEL | CCTV | United States of America (USA) | |
| Access Systems Integration, LLC | Integrated security | United States of America (USA) | |
| Accu-Tech Corp. | Access control | United States of America (USA) | |
| Acme Security Systems | CCTV | United States of America (USA) | |
| ACMP | CCTV | Global | |
| Active Response Monitoring | Central monitoring systems | United States of America (USA) | |
| Active Vision Inc. | CCTV | United States of America (USA) | |
| Adesta LLC | CCTV | United States of America (USA) | |
| ADS Security | Central monitoring systems | United States of America (USA) | |
| ADT | Integrated security | Global | |
| Advanced Digital Security, Inc | CCTV | United States of America (USA) | |
| Advantech, Inc. | Consulting services | United States of America (USA) | |
| Advantor System Corporation | Access control | United States of America (USA) | |
| AFRISEC, LLC | Integrated security | Global | |
| AFTEK Ltd | Door interface/controls | India | |
| All American Technology | CCTV | United States of America (USA) | |
| All Covert Security | IP networking products | United States of America (USA) | |
| Alliance Systems Integrators | CCTV | United States of America (USA) | |
| Alutiiq, LLC | CCTV | United States of America (USA) | |
| AMEC | CCTV | United Kingdom (UK) | |
| Amerigard Alarm & Security Corp | Integrated security | North America | |
| Andrews International | Physical security | Global | |
| ANPR International Limited | Car Park Management Systems | United Kingdom (UK) | |
| APS 2000, Inc. | Access control | United States of America (USA) | |
| ARATOS-SECURITY HOMELAND DEVELOPMENT | Integrated security | Global | |
| Arinc Inc. | CCTV | United States of America (USA) | |
| Arkanics | CCTV | United States of America (USA) | |
| ARM Electronics Co., Ltd. | CCTV | United States of America (USA) | |



