| Reesink UK Ltd | Wholesale & retail | 2015 |
| Reevetec Geomembranes Ltd | Construction | 2018 |
| Reference Hub Limited | Administrative & support | 2022 |
| Regaltags Global Limited | Manufacturing | 2014 |
| Regtechpro Limited | Professional & scientific | 2017 |
| Remofox Limited | Wholesale & retail | 2025 |
| Renovation Underwriting Limited | Financial services | 2018 |
| Rero Properties Limited | Real estate | 2025 |
| Resat Catering Ltd | Hospitality | 2019 |
| Retech Digital Ltd. | Administrative & support | 2021 |
| Revamp the Ramp CIC | Manufacturing | 2022 |
| Revitalise Your Health Ltd | Health & social care | 2024 |
| Revivo Sauna Ltd | Administrative & support | 2025 |
| Rfid Discovery Limited | Information & communication | 2017 |
| RGB Lighting Limited | Arts & recreation | 2025 |
| RHE Southern Limited | Professional & scientific | 2011 |
| Rich Technology Limited | Information & communication | 2006 |
| Richard Cornall Ltd | Construction | 2024 |
| Richardson International Limited | Professional & scientific | 2018 |
| Richmond Hill Financial Limited | Financial services | 2005 |
| Ricky Stead Builder Ltd | Construction | 2026 |
| Ridgebacks International Limited | Wholesale & retail | 2015 |
| Ridgevale Limited | Real estate | 2004 |
| Ridiculum Limited | Professional & scientific | 2013 |
| Riggall and Hawksford Limited | Construction | 2003 |
| Right Choice Retail Ltd | Wholesale & retail | 2021 |
| Ripton Activities Ltd | Hospitality | 2026 |
| Rise Youth Coaching C.I.C. | Education | 2023 |
| Risk Management Consultants Ltd | Water & waste | 2003 |
| River Church (ST Neots) Ltd | Other services | 2008 |
| Rivermill Management Ltd | Hospitality | 2015 |
| Riversedge Limited | Wholesale & retail | 1995 |
| Riverside Health & Leisure C.I.C. | Health & social care | 2023 |
| Riverside Mill Freehold Ltd | Real estate | 2013 |
| Riverside Mill Limited(The) | Households | 1984 |
| RJ Watkins Limited | Energy | 2023 |
| RK Mobile Chef Ltd | Hospitality | 2020 |
| RLC Pubs Limited | Hospitality | 2017 |
| Roachmag Ltd | Information & communication | 2024 |
| Robert Bruce Solutions Limited | Real estate | 2015 |
| Robert Hall Ltd | Construction | 2016 |
| Roberts Inc Ltd | Construction | 2020 |
| Robesa Investments Limited | Real estate | 2013 |
| Rockett Interiors Ltd | Construction | 2024 |
| Rocksmith Renovations Ltd | Construction | 2024 |
| Rockstar Hubs International Lawyers Limited | Professional & scientific | 2016 |
| Rockstar Support Services Limited | Administrative & support | 2017 |
| Roland & Hammond Limited | Real estate | 1961 |
| Roland Properties Limited | Real estate | 1989 |
| Romsey Terrace Residents Management Company Limited | Real estate | 2019 |
| Roofglaze Rooflights Limited | Construction | 2017 |
| Roperian Limited | Real estate | 2015 |
| Rose & Hound Limited | Professional & scientific | 2025 |
| Rose Court Management (Eaton Socon) Limited | Households | 1987 |
| Rosehill Furniture Retail Ltd | Wholesale & retail | 2025 |
| Rotate Recruitment Ltd | Administrative & support | 2022 |
| Rothery AV Limited | Other services | 2008 |
| Round Numbers Limited | Professional & scientific | 2008 |
| Rowland Product Services Ltd | Information & communication | 2018 |
| RPH Developments Cambridgeshire Limited | Construction | 2017 |
| Rsfc Ltd | Construction | 2025 |
| Rshi CAP Platform Limited | Other services | 2016 |
| Rshi Holdings Limited | Financial services | 2016 |
| Rshi Investment B1 Limited | Financial services | 2016 |
| Rshi Investments A1 Limited | Financial services | 2016 |
| Rshi Investments AH1 Limited | Water & waste | 2017 |
| Rshi Investments AP1 Limited | Information & communication | 2017 |
| Rshi Investments C1 Limited | Professional & scientific | 2016 |
| Rshi Investments E1 Limited | Arts & recreation | 2016 |
| Rshi Investments G1 Limited | Wholesale & retail | 2017 |
| Rshi Limited | Professional & scientific | 2015 |
| RT & E Limited | Administrative & support | 2004 |
| RTS Studios Ltd | Education | 2020 |
| Rubic Solutions Limited | Administrative & support | 2006 |
| Rufprofi Ltd | Administrative & support | 2021 |
| Russets Consulting Ltd | Professional & scientific | 2026 |
| RWC Larcy Limited | Information & communication | 2023 |
| Rwtn Ltd | Hospitality | 2023 |
| Rzrf Limited | Health & social care | 2025 |
| S & D Motor Vehicle Mechanics Ltd | Wholesale & retail | 2024 |
| S & J Usher Limited | Professional & scientific | 2014 |
| S & T Retail Services Limited | Wholesale & retail | 2026 |
| S a Gregory Ltd | Other services | 2025 |
| S a Small Ltd | Professional & scientific | 2011 |
| S and a Engineering (ST Neots) Ltd. | Professional & scientific | 2016 |
| S G Composites Ltd | Professional & scientific | 2019 |
| S Griffiths Engineering Solutions Limited | Administrative & support | 2008 |
| S J Murphy Ltd | Information & communication | 2015 |
| S J Wilson Trading Ltd | Wholesale & retail | 2019 |
| S. GUY - Immigration Services and Advice Limited | Professional & scientific | 2024 |
| S.A.H. Driving Services Limited | Transport & logistics | 2012 |
| S.P.C Automotive Repairs Limited | Wholesale & retail | 2023 |
| Saegmuehle Development Limited | Real estate | 2013 |
| Safa Barbers Ltd | Other services | 2025 |
| Safeguard Electrical Engineering Ltd | Construction | 2010 |
| Safety Stars Limited | Education | 2018 |
| Safi - Floor Ltd | Administrative & support | 2022 |
| Saint One Limited | Extraterritorial | 2014 |
| Saints Bricklaying Limited | Construction | 2020 |
| Saints Brickwork Limited | Construction | 2013 |