
| Company name | Primary business area | Primary coverage | |
|---|---|---|---|
| China Security and Protection Industry Association (CSPIA) | Access control | China | |
| 24/7 Close Protection Ltd | Physical security | United Kingdom (UK) | |
| 4A International, LLC | Consulting services | United States of America (USA) | |
| A2Z Security Group | Integrated security | United Kingdom (UK) | |
| AAA Security Service | Manned guarding | United States of America (USA) | |
| Able Security Concepts Ltd | Manned guarding | United Kingdom (UK) | |
| Absolute Security Ltd. | CCTV | Kenya | |
| AD Porta Security | Manned guarding | United Kingdom (UK) | |
| Ad-Mark Nigeria Company | RFID | Nigeria | |
| ADEN Services | Physical security | China | |
| Advance Peripheral Systems Ltd | Intruder alarm | United Kingdom (UK) | |
| Advance Security UK Ltd | Manned guarding | United Kingdom (UK) | |
| AIMS Service | Integrated security | Egypt | |
| Alfahad Group | CCTV | Middle East | |
| ALGIZ Services Ltd | Consulting services | Germany | |
| Alink Ltd (Security Installers) | Integrated security | United Kingdom (UK) | |
| ALLAS Sisteme de Securitate SRL | CCTV | Republic of Moldova | |
| Allscope Technologies Ltd. | Physical security | Nigeria | |
| Allscope Technologies Nigeria Ltd. | Global positioning systems | Nigeria | |
| Amerigard Alarm & Security Corp | Integrated security | North America | |
| Anadal Technologies Limited | Integrated security | Nigeria | |
| Andrews International | Physical security | Global | |
| Applied Security Research Associates | Consulting services | Canada | |
| Apsaugos Komanda | Manned guarding | Lithuania | |
| Arrest Fire & Security Ltd | CCTV | United Kingdom (UK) | |
| Associated Risks Limited | Maritime Security | United Kingdom (UK) | |
| AST (London) Limited | Access control | United Kingdom (UK) | |
| Atkins Telecoms | Consulting services | Global | |
| Atlantis Close Protection | Physical security | United Kingdom (UK) | |
| Atlas Telecom | Integrated security | United Arab Emirates | |



