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- Recognition Source
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- Rocky Mountain Montoring
- Roetek Inc
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- Ron & Sons Inc
- Ron Duckson Security Systems
- Ron Mueller
- Roofers Local 149 Security
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- Ross Security Solutions Inc
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- Rush Communications
- Russian-American Nuclear
- Rutherford Services Inc
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- Ryczek Communications
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- S & I Control Concepts Inc
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- Sabin's Star Lock Security
- Sabur International Security
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- Safewatch Data & Security Inc
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- Sales Support Unlimited Inc
- Sam Systems Inc
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- Sanders Security Inc
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- Sarto Group
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- Scan-O-Vision
- Scarsdale Security Systems Inc
- Sceise International Inc
- Scenic Security Fence Co
- Schatz Electronics Inc
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- Schlabach Metal Fab
- Schmidt Security Systems Inc
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- SCI Alarm Inc
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- Sec-Tron Inc
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- Secur-Tek Inc
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- Securecom1 LLC
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- Securetel
- Securetronics Inc
- Securex Alarm Svc
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- Securi-Com
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- Securitas
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- Securitas Security Svc USA Inc
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