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| Company name | Primary business area | Primary coverage | |
|---|---|---|---|
| Guide Infrared | CCTV | China | ![]() |
| Gallagher Security | Integrated security | Global | |
| Genetec Inc. | IP networking products | United States of America (USA) | |
| GEUTEBRUCK GmbH | CCTV | Germany | |
| GSA Exhibitions Private Limited (GSAL) | Communicators | United Kingdom (UK) | |
| GVD Europe | IP networking products | Western Europe | |
| G Force Security Ltd | Intruder alarm | United Kingdom (UK) | |
| G-Max Security Tech Ltd | Perimeter protection | Global | |
| G-Tec Distribution Ltd | CCTV | United Kingdom (UK) | |
| G.B. Electronics Ltd | CCTV | United Kingdom (UK) | |
| G.B. Security Systems Ltd | CCTV | United Kingdom (UK) | |
| G.S.N Electronic Company | Intruder alarm | Israel | |
| G1 Ltd | CCTV | United Kingdom (UK) | |
| G20 Security Ltd | Manned guarding | United Kingdom (UK) | |
| G20 Security Services | Manned guarding | United Kingdom (UK) | |
| G3 Security Services | Manned guarding | United Kingdom (UK) | |
| G4S Cash Services (UK) Ltd | Cash in transit | United Kingdom (UK) | |
| G4S Holdings (Hong Kong) Ltd. | Access control | Hong Kong | |
| G4S Resourcing Solutions | Recruitment services | United Kingdom (UK) | |
| G4S Secure Solutions (USA) | Physical security | United States of America (USA) | |
| G4S Security Services | Manned guarding | Jordan | |
| G4S Security Services (Malta) Ltd | Manned guarding | Global | |
| G4S Security Services (UK) | Access control | United Kingdom (UK) | |
| G4S Security Services Egypt LLC | CCTV | Egypt | |
| G4S Security Systems (UK) Ltd | Access control | United Kingdom (UK) | |
| G4S Technology LLC | Access control | United States of America (USA) | |
| G4S Technology Ltd. | Access control | United Kingdom (UK) | |
| G4Tec | Access control | United Kingdom (UK) | |
| Gaffco | Access control | United States of America (USA) | |
| GAI-Tronics® | Communication equipments | United States of America (USA) | |



