| Revolution Education Ltd | Somerset |
| Revolution Technology | |
| Revolution Turbine Technologies | |
| Revolution Viewing | West Yorkshire |
| Reward Gateway UK Ltd | Greater London |
| Reward Services & Technologies Ltd | |
| Rewire Security | |
| Rewired.one | Greater London |
| Reydar | |
| ReZolve | North Yorkshire |
| Rezon8AI Ltd | |
| Rezzil | |
| RF Concepts Ltd | Lisburn and Castlereagh |
| RF DataTech | Kent |
| RF Digital | Staffordshire |
| RF Services Scotland Ltd | Carmarthenshire |
| RFID Centre Ltd | Surrey |
| RFID Systems | |
| RFX Ltd | West Lothian |
| RG Adrac Ltd | Greater Manchester |
| RG Solutions | |
| RGB Communications Ltd | Berkshire |
| RGB Solutions Ltd | Edinburgh |
| RGBteam | |
| RGS IT Consulting Ltd | Cheshire |
| RHC Creative Strategy | |
| Rhino Websites | |
| RHM Telecommunications | Gloucestershire |
| Rialto | |
| Ribbon Technologies Ltd | |
| Ribot | East Sussex |
| Ricemedia | West Midlands |
| Rich Tilling | |
| Richard Bartle | |
| Richard Batt | |
| Richard Beckett Web Design | |
| Richard Leishman | Staffordshire |
| Richard Meek Computer Services | Devon |
| Richmond Pharmacology | |
| Richmond University | Greater London |
| Ricoh UK | |
| Ride Digital Marketing | |
| RideTandem | |
| Ridgeon Network Ltd | Leicestershire |
| Ridgeway Studios Marketing Ltd | Oxfordshire |
| Riello UPS | Wrexham County Borough |
| Right Click Internet | West Yorkshire |
| Right People Ltd | |
| Rightsoft | |
| Rightsource Solutions | |