| Raznab Trader Ltd | Wholesale & retail | 2011 |
| RB Multi-Skilled Maintenance Ltd | Professional & scientific | 2023 |
| RBD Flooring Limited | Construction | 2022 |
| RC Restaurant Ltd | Hospitality | 2019 |
| RC Simulations Ltd | Professional & scientific | 2010 |
| RCS Burgess Limited | Wholesale & retail | 2005 |
| RCS Group Holdings Limited | Financial services | 2021 |
| RCS Holdings Limited | Real estate | 2004 |
| RCU Limited | Professional & scientific | 1993 |
| RD Commercial Developments Limited | Construction | 2022 |
| RDJ Sport Limited | Arts & recreation | 2017 |
| Re-Stock Bristol Ltd | Wholesale & retail | 2019 |
| Reach Health & Wellbeing Coaching Limited | Other services | 2022 |
| Reach Personal Injury Services Limited | Health & social care | 1997 |
| Reading and Beyond Ltd | Education | 2019 |
| Reading Food & Wine Ltd | Wholesale & retail | 2015 |
| Readytech Limited | Professional & scientific | 2014 |
| Real Tech IT Group Limited | Wholesale & retail | 2020 |
| Realign Pilates Limited | Arts & recreation | 2026 |
| Really Clever Limited | Hospitality | 2015 |
| Realsolidfurniture Limited | Wholesale & retail | 2018 |
| Reaper 24/7 Protection Services Ltd | Administrative & support | 2020 |
| Reaper Limited | Real estate | 1962 |
| Rebecca Murray Holdings Limited | Financial services | 2021 |
| Rebeccas Care Limited | Health & social care | 2024 |
| Rebel Piercing and Tattoos Ltd | Other services | 2021 |
| Rebel Resource Limited | Health & social care | 2019 |
| Rebelsocial Chorley Ltd | Arts & recreation | 2026 |
| Receptive Solutions Limited | Wholesale & retail | 2013 |
| Red Adair Ltd | Professional & scientific | 2010 |
| Red Alligator Group Limited | Administrative & support | 2002 |
| Red Brick Events Ltd | Hospitality | 2019 |
| Red Elephant Limited | Professional & scientific | 2014 |
| Red Energy Solutions Ltd. | Construction | 2010 |
| Red Flag A!Ert LLP | | 2003 |
| Red Rose Groundcare Limited | Extraterritorial | 2013 |
| Red Rose Landscapes Limited | Administrative & support | 2010 |
| Red Rose Ribs Ltd | Manufacturing | 2024 |
| Red Rose Roofing + Flat Roofing Specialist Limited | Construction | 2026 |
| Red Rose Storage Limited | Administrative & support | 2006 |
| Red Sable Leisure Ltd | Hospitality | 2023 |
| Red Utilities Limited | Construction | 2004 |
| Red-Dent Ltd | Health & social care | 2023 |
| Redbridge Motor Company Ltd | Wholesale & retail | 2003 |
| Redford and JD Developments Ltd | Construction | 2023 |
| Redford Construction Limited | Construction | 2018 |
| Redhill Trading Limited | Administrative & support | 2003 |
| Rediscovers Aqua Limited | Construction | 2018 |
| Redmoor Health Limited | Information & communication | 2017 |
| Redo Traders Ltd | Wholesale & retail | 2021 |
| Redpath Leach Estate Agents Limited | Real estate | 2022 |
| Redwood Consulting (U.K) Ltd | Professional & scientific | 2020 |
| Reed Property Solutions Ltd | Hospitality | 2017 |
| Reedley Hallows Developments Limited | Real estate | 2021 |
| REEL2REEL Rigging Services Ltd | Construction | 2013 |
| Reeshore Property LLP | | 2010 |
| Refined Renovations Ltd | Real estate | 2019 |
| Refined Sealants Ltd | Construction | 2024 |
| Reflection (Chorley) Ltd | Other services | 2013 |
| Refosco Limited | Hospitality | 2010 |
| Refreshing Taverns Ltd | Construction | 2016 |
| Refurb Engineering Services Ltd | Professional & scientific | 2026 |
| Regdata Ltd | Information & communication | 2019 |
| Regen Bespoke Hair Systems Ltd | Wholesale & retail | 2022 |
| Regent Construction & Joinery Limited | Construction | 2014 |
| Regent Joinery Limited | Construction | 2016 |
| Regionally Capital Limited | Administrative & support | 2024 |
| Regionally Ventures Holdings Limited | Financial services | 2016 |
| Regionally Ventures Limited | Administrative & support | 2023 |
| Reids 003 Ltd | Construction | 2019 |
| Reids 06 Ltd | Real estate | 2018 |
| Reids Holdings Ltd | Professional & scientific | 2019 |
| Reids of Mayfair Ltd | Real estate | 2017 |
| Reignite Lighting Ltd | Professional & scientific | 2025 |
| REJUVEN8 Skin Studio Limited | Professional & scientific | 2013 |
| Relish NO 37 Limited | Hospitality | 2019 |
| Remi Electrical Limited | Energy | 2014 |
| Renocore Limited | Professional & scientific | 2026 |
| RENOO2 Ltd | Health & social care | 2026 |
| Renovo Search Ltd | Professional & scientific | 2024 |
| Rentapad Ltd | Real estate | 2019 |
| Reparo Fast Track Finance Group Limited | Financial services | 2014 |
| Reparo Finance Limited | Financial services | 2014 |
| Reparo FT Limited | Financial services | 2017 |
| Research Devices Ltd | Professional & scientific | 2016 |
| Reset Consultancy Ltd | Professional & scientific | 2020 |
| Reset Events Ltd | Hospitality | 2021 |
| Resilience Fitness Ltd | Health & social care | 2011 |
| Resin Paint Limited | Construction | 2024 |
| Resolute Debt Recovery Ltd | Administrative & support | 2010 |
| Resolution Flooring Ltd | Construction | 2026 |
| Restorus Limited | Information & communication | 2021 |
| Retail 83 Ltd. | Administrative & support | 2023 |
| Retail Credit Services Limited | Administrative & support | 2017 |
| Retail Revolution London Limited | Wholesale & retail | 2008 |
| Retro Music Room Ltd | Wholesale & retail | 2026 |
| RETRO21 Ltd | Professional & scientific | 2022 |
| Retrosix Ltd | Wholesale & retail | 2019 |
| Reus Construction Limited | Construction | 2017 |
| Revilo Solutions Limited | Administrative & support | 2019 |