- ASG Security
- AvantGuard Monitoring
- Amherst Alarm
- Alarm Partners
- Automated Security Alert – Life Safety Monitoring
- Alarmco, Inc
- Acadian Monitoring Services
- Bold Group
- Comporium
- CIA-Commercial Instrument and Alarm Systems
- Centra-Larm
- CST – Critical Signal Technologies
- Cen-Signal
- Dynamark Monitoring- First Action Team
Diebold Event Monitoring Center
Doyle Security
Emergency 24
- ESC Central Inc
- Federal Protection
- F.E. Moran, Inc
- Guardian Security Systems, Inc
- Guardian Alarm Company
- GMS-General Monitoring Services, Inc
- Interface Security Systems, LLC.
- Kings III Emergency Communications
- Kastle Systems
- Legacy Security Services, Inc
- Loss Prevention Services
- Life Alert
- Main Security Surveillance
- MKS – Micro Key
- National Monitoring
- Paragon SystemsQuick Response Monitoring Alarm
- Security Central, Inc
- SecurTek Monitoring Solutions
- Security Instrument Corp
- Sonitrol Security Services, Inc.
- Seacoast Security
- Southwest Dispatch
- Security Partners
- SEI – Security Equipment, Inc
- SoloProtect
- Total Monitoring Services, Inc
- Telsco Security Systems
- USA Central Station
- UCC – United Central Control
- UAS – Universal Atlantic Systems, Inc
- Vision Monitoring-World Wide Security
- WH International Response Center