| Refuels Shipping Limited | Energy | 2023 |
| Regen Fuels Limited | Wholesale & retail | 2003 |
| Remarkable Focus Limited | Information & communication | 2018 |
| Rendalls Vehicle Services Limited | Administrative & support | 2026 |
| Renewable Transport Fuel Services Limited | Energy | 2017 |
| RES Building Services Ltd | Construction | 2022 |
| RES Controls Ltd | Construction | 2019 |
| Resident Care at Signature Opco LLP | | 2023 |
| Restaurants North Limited | Hospitality | 2026 |
| Retail Energy Solutions Limited | Construction | 2017 |
| Retroflect Ltd | Information & communication | 2024 |
| Reverso Limited | Professional & scientific | 2016 |
| Revive a Build Ltd | Construction | 2016 |
| Revive Tanning and Beauty Beaconsfield Ltd | Other services | 2024 |
| Revolution Car Sales Ltd | Wholesale & retail | 2022 |
| Revolution Running Limited | Administrative & support | 2009 |
| REX Bakery Ltd | Hospitality | 2013 |
| RGB Trading Ltd | Financial services | 2007 |
| Rheinberry Ltd | Professional & scientific | 2014 |
| Rhian Martin Fitness Ltd | Arts & recreation | 2022 |
| RHM Associates Limited | Professional & scientific | 2003 |
| RHR Hughes Trading Limited | Real estate | 2016 |
| RI Secure (UK) Ltd | Information & communication | 2019 |
| Richard Mott Property Ltd | Real estate | 2024 |
| Richards Retreats Ltd | Real estate | 2025 |
| Richardson Rogers Limited | Professional & scientific | 1995 |
| Rideaway Marketplace Limited | Information & communication | 2023 |
| Ringhall Properties Ltd. | Construction | 2006 |
| Risk Champion Ltd | Administrative & support | 2010 |
| Riverbrook Limited | Real estate | 2005 |
| Rivercrest Developments II Limited | Construction | 2023 |
| Rivercrest Developments Limited | Construction | 2016 |
| Rivercrest Investments Limited | Real estate | 2004 |
| Rivercrest Management Limited | Real estate | 1997 |
| Rivermain Limited | Construction | 2022 |
| Rivesud Limited | Real estate | 2023 |
| RKA Neurodevelopmental Support Limited | Education | 2026 |
| Rmsk Management Ltd | Other services | 2016 |
| Rock & Roll Constructions Ltd | Construction | 2014 |
| Rockdj Properties Limited | Real estate | 2025 |
| Rockmeek Limited | Other services | 2020 |
| Rodreid Civil Engineering Ltd | Construction | 2019 |
| Roma Developments (IOW) Limited | Construction | 2015 |
| Roma Developments (Southern) Limited | Construction | 2015 |
| Roma Developments Holdings Limited | Construction | 2015 |
| Roma Investment Holdings Ltd | Real estate | 2020 |
| Romara Dhillon Limited | Professional & scientific | 2023 |
| Romeo's Pizzeria Limited | Hospitality | 2022 |
| Rooki Ventures Limited | Real estate | 2024 |
| Rosebush Developments UK Limited | Administrative & support | 2019 |
| Rosewood Automobiles Limited | Wholesale & retail | 2021 |
| Rosewood Bespoke Limited | Construction | 2022 |
| Rosewood DRY Lining and Plastering Limited | Construction | 2021 |
| Rosewood Holdings & Investments Limited | Real estate | 2020 |
| Rosewood Luxury Developments Ltd | Construction | 2021 |
| Rosewood New Homes Limited | Construction | 2021 |
| Ross Family Investments Limited | Financial services | 2017 |
| Ross Property Development Limited | Construction | 2017 |
| Rossco Evans Limited | Administrative & support | 2013 |
| Roughacre Investments Limited | Real estate | 2020 |
| Rouse Audit LLP | | 2010 |
| Rouse Partners LLP | | 2010 |
| Rowell Elipe Limited | Real estate | 2026 |
| Royale Properties Ltd | Real estate | 2017 |
| RSU Consulting Limited | Real estate | 2026 |
| RT App Technology Ltd | Information & communication | 2024 |
| Rtch Design Limited | Professional & scientific | 1998 |
| RTM Solutions UK Limited | Information & communication | 2025 |
| RUG Clinic Ltd | Other services | 2013 |
| Russell Limited | Households | 1988 |
| Russell Place Consulting Ltd | Information & communication | 2011 |
| Russell West Associates Ltd | Professional & scientific | 2002 |
| Ruth King & Sons (Reepham) Limited | Agriculture & fishing | 1987 |
| RW 10 Wycombe END Limited | Construction | 2021 |
| RW 49 Marsham Way Ltd | Construction | 2022 |
| RW 7 Kingsway Ltd | Construction | 2022 |
| RW 98 Packhorse Road Limited | Construction | 2022 |
| RW Locksley Limited | Construction | 2024 |
| RW Mill Barn Limited | Construction | 2022 |
| RWF Health and Community Developers (Tranche 1) Limited | Real estate | 2004 |
| RWF Health and Community Developers Limited | Real estate | 2004 |
| RWM Law Ltd | Professional & scientific | 2021 |
| RWR Contract Management Ltd | Construction | 2014 |
| Rwrd Ltd | Information & communication | 2018 |
| Ryde (Theale) Limited | Real estate | 1988 |
| RYE Court Hotel Limited | Real estate | 2016 |
| S & S Developments Inc. Ltd | Real estate | 2020 |
| S Davidson Consulting Limited | Professional & scientific | 2016 |
| S E R Property Limited | Construction | 1979 |
| S J Bailey (Holdings) Limited | Administrative & support | 2022 |
| S&G Network Ltd | Professional & scientific | 2025 |
| S&I Corporate Limited | Extraterritorial | 2004 |
| S&S Services Ltd | Construction | 2012 |
| S-Thetics Limited | Health & social care | 2007 |
| Saadi Chaa Ltd | Wholesale & retail | 2026 |
| Saanvika Software Solutions Ltd | Information & communication | 2015 |
| Saas CFO Limited | Professional & scientific | 2024 |
| Sabn Limited | Professional & scientific | 2024 |
| Sacla UK Limited | Wholesale & retail | 1991 |
| Safebet Consulting Limited | Professional & scientific | 2023 |