- Sapphire Inspection Systems Ltd - Royston
- Schoolyard Ltd - Royston
- Security Trade Products - Royston
- Senior Aerospace Thermal Engineering - Royston
- Smashtag Ltd - Royston
- Sure Safe - Royston
- Syrris Ltd - Royston
- Tank Shop - Royston
- The Hire Network - Royston
- Tryka L E D Ltd - Royston
- Volac International - Royston
- Walters & Walters Ltd - Royston
- Wirewell Electronic Services Ltd - Royston
Companies 51 to 63
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