- SIE Industrial Ltd - Washington
- SigNET AC Ltd - Washington
- Snowdonia Computer Solutions Ltd - Washington
- Specialist Floors North East - Washington
- Springwell Precision - Washington
- Statebourne Cryogenics - Washington
- Sustainable Energy Engineering - Washington
- Swandene Specialist Contract Interiors - Washington
- Tanfield Metal Spinners - Washington
- TaylorHood Metalworks Ltd - Washington
- The Sekura Group - Washington
- Titan Fluid Technologies Ltd - Washington
- Titan Panels - Washington
- Van Elle - Washington
- Wearside Pneumatics Ltd - Washington
- Wearside Rewind & Services Ltd - Washington
Companies 51 to 66
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