| R.E.A.L. Independent Schools Blidworth Limited | Education | 2012 |
| R.E.A.L. Independent Schools Hinckley Limited | Education | 2019 |
| R.E.A.L. Independent Schools Ilkeston Limited | Education | 2019 |
| R.J. Cooper Transport Limited | Transport & logistics | 1974 |
| R.M. Wheeler Limited | Transport & logistics | 2008 |
| R.N. Padfield & Sons Limited | Agriculture & fishing | 1958 |
| R.W. Cove Transport Ltd. | Transport & logistics | 2002 |
| R2 Services Ltd | Professional & scientific | 2020 |
| R3VIVE Through Sound CIC | Manufacturing | 2026 |
| RA Glos Limited | Hospitality | 2025 |
| RAB Developments Hereford Limited | Construction | 2024 |
| Racek Ltd | Hospitality | 2024 |
| Rachel’S Caring Companions Ltd | Health & social care | 2020 |
| Racket Stringer Ltd | Arts & recreation | 2023 |
| Radearhub Ltd | Health & social care | 2025 |
| Radford Financial & Business Solutions Limited | Professional & scientific | 2018 |
| Radio Bidco Limited | Financial services | 2017 |
| Radio Holdco Limited | Financial services | 2017 |
| Radio Midco Limited | Financial services | 2017 |
| Radioactive Group Limited | Professional & scientific | 2019 |
| Radison TM Ltd | Construction | 2025 |
| Radoslavov Ltd | Transport & logistics | 2023 |
| Radtherm UK Limited | Administrative & support | 2024 |
| Ragged Woven Fabrics Limited | Manufacturing | 2024 |
| Raghav Retail Limited | Wholesale & retail | 2015 |
| Raging Bull Group Limited | Wholesale & retail | 2015 |
| Railko Limited | Manufacturing | 2006 |
| Rain OR Shine Theatre Company | Arts & recreation | 1998 |
| Rain Property Management Ltd | Construction | 2025 |
| Rain Saburi Ltd | Health & social care | 2017 |
| Rainbow Dinner Limited | Hospitality | 2024 |
| Rainbow Routes Limited | Transport & logistics | 2025 |
| Rainbow Tree Play Therapy C.I.C. | Education | 2022 |
| Raincoatmoon Ltd | Information & communication | 2023 |
| Raise Youth UK Ltd | Information & communication | 1999 |
| Rajay Autos Ltd | Wholesale & retail | 2025 |
| RAK View Properties Ltd | Real estate | 2024 |
| Ralimaging Ltd | Real estate | 2019 |
| Ramazay Limited | Hospitality | 2021 |
| Rams Engineering Consultancy Services Ltd | Professional & scientific | 2024 |
| Randall Kitchens Limited | Construction | 2022 |
| Range Moor Properties LLP | | 2026 |
| Rannoch 2021 Limited | Administrative & support | 2022 |
| Ranya GL1 Ltd | Wholesale & retail | 2025 |
| Ranzoaz Ltd | Hospitality | 2021 |
| Rapid Rail (GB) Limited | Manufacturing | 2008 |
| Rare Breeds Meat Ltd | Manufacturing | 2024 |
| Rasa Foods Ltd | Manufacturing | 2019 |
| Rasdio Limited | Information & communication | 2018 |
| Rateshield Computers Limited | Other services | 1992 |
| Rather Inventive Limited | Information & communication | 2009 |
| Ravenfaith Media Ltd | Professional & scientific | 2025 |
| Ravenhill Logistics Ltd | Transport & logistics | 2024 |
| Ravenscroft Anaesthetic Services Limited | Health & social care | 2019 |
| Raventree Limited | Manufacturing | 2006 |
| Ravitailler EN VOL Ltd | Other services | 2013 |
| Ravula IT and MGT Consultancy Limited | Information & communication | 2014 |
| RAW Sportswear Ltd | Manufacturing | 2019 |
| RAW Talent Group Limited | Administrative & support | 2024 |
| Rawington Limited | Construction | 2007 |
| Rawpixel Ltd | Professional & scientific | 2015 |
| RAY Consulting Limited | Information & communication | 2015 |
| Rayer's Holdings Limited | Real estate | 1953 |
| Raymond Geddes Consulting Ltd | Information & communication | 2018 |
| Raystra Healthcare Limited | Administrative & support | 2018 |
| Rayy Films Ltd | Information & communication | 2022 |
| Razvan Alexandru Ltd | Transport & logistics | 2026 |
| RB PAT Solutions Ltd | Professional & scientific | 2024 |
| RBA Estates Limited | Construction | 2020 |
| RBG Roofing Ltd | Construction | 2025 |
| Rblt (Property) Limited | Real estate | 2021 |
| Rbpr Limited | Wholesale & retail | 2014 |
| RC Placements Ltd | Administrative & support | 2024 |
| RCL 2022 Limited | Real estate | 2022 |
| RCM FIN Service Ltd | Professional & scientific | 2023 |
| RD Contract Services Limited | Administrative & support | 2018 |
| RDA Shop Fitting Ltd | Construction | 2018 |
| RDB Safety Boat Limited | Construction | 2011 |
| RDM Procurement Limited | Information & communication | 2017 |
| Rdppromotionalgifts Ltd | Wholesale & retail | 2019 |
| Rdst Limited | Wholesale & retail | 2008 |
| Rdtech Ltd | Information & communication | 2011 |
| Re-Boot Care Services Limited | Health & social care | 2018 |
| Re:You Therapy Ltd | Other services | 2024 |
| React Safety Training Limited | Public administration | 2026 |
| Reading Ortho Ltd | Administrative & support | 2025 |
| Real Alliance Healthcare Ltd | Health & social care | 2019 |
| Real Estate Gloucester Limited | Transport & logistics | 2007 |
| Real Friends Ltd | Wholesale & retail | 2025 |
| Real Integrity Community Limited | Education | 2021 |
| Real Scilly Properties Ltd | Hospitality | 2022 |
| Realhus Ltd | Real estate | 2026 |
| Reallyree Publishing Ltd | Information & communication | 2013 |
| Realm Employment and Consultancy Agency Ltd | Administrative & support | 2019 |
| Realty MAX Ltd | Real estate | 2022 |
| Rebaz Motor Repair Ltd | Wholesale & retail | 2025 |
| Rebel Data Group Limited | Information & communication | 2025 |
| Rebooked Ltd | Wholesale & retail | 2026 |
| Recordme.Io Ltd | Information & communication | 2025 |
| Red Cherry (Bristol) Ltd | Professional & scientific | 2012 |