| Ridgemont Crest Limited | Administrative & support | 2014 |
| Ridgeway Consulting 2008 Limited | Professional & scientific | 2008 |
| Ridgeworks Limited | Professional & scientific | 2026 |
| Riga Services Twenty SIX Limited | Construction | 2002 |
| Rige Associates Limited | Real estate | 2021 |
| Right 1 Ltd | Real estate | 2006 |
| Right Choice Homerton Ltd | Wholesale & retail | 2018 |
| Right Partnership Recruitment Limited | Administrative & support | 2018 |
| Right Place Marketing Ltd | Administrative & support | 2023 |
| Right Resolution CIC | Health & social care | 2007 |
| Right to Return Alliance Limited | Extraterritorial | 2022 |
| Rightgate 3 Limited | Hospitality | 2016 |
| Rightgate Management Co Ltd | Hospitality | 2010 |
| Rightway Property Investment Ltd | Real estate | 2022 |
| Rightway Realtors and Developers Ltd | Wholesale & retail | 2021 |
| Riiard Ltd | Health & social care | 2023 |
| Rik-Art Limited | Wholesale & retail | 2011 |
| Rikoto Limited | Wholesale & retail | 2023 |
| Riku Homes Ltd | Real estate | 2025 |
| Riley Construction Services Ltd | Construction | 2017 |
| Rima Associates Ltd | Health & social care | 2018 |
| Rincewind Services Limited | Professional & scientific | 2007 |
| Ring O Roses Consulting Ltd | Professional & scientific | 2019 |
| Ringer Baits Limited | Arts & recreation | 2016 |
| RIO Muhammad Faisal Ltd | Wholesale & retail | 2025 |
| Ripe Enterprises Limited | Education | 2006 |
| Ripley View Management Company Limited | Households | 2017 |
| Ripple Films Ltd | Information & communication | 2015 |
| RIS Development Ltd | Construction | 2015 |
| Rise 10 Talent Limited | Administrative & support | 2024 |
| Rise Global Distribution Ltd | Wholesale & retail | 2021 |
| Rishay Ltd | Real estate | 2026 |
| Rising Stars Performing Arts Academy Ltd | Education | 2025 |
| Rising Sun (Wootton) Ltd | Hospitality | 2016 |
| Risk Heaven Capital Ltd | Information & communication | 2026 |
| Risk Performance Ltd | Administrative & support | 2001 |
| Risk&Prosper Ltd | Wholesale & retail | 2026 |
| Riski Business Ltd | Administrative & support | 2013 |
| Risto Fast Ltd | Hospitality | 2024 |
| RIT Draincare Limited | Extraterritorial | 2024 |
| RIT Holdings Ltd | Financial services | 2021 |
| Rita Baxi Limited | Administrative & support | 2017 |
| Rithvik Private Limited | Hospitality | 2020 |
| Riti Logistick Ltd | Transport & logistics | 2014 |
| Rituel Ltd | Arts & recreation | 2026 |
| Rivarda Ltd | Professional & scientific | 2017 |
| Rivaton Management Limited | Professional & scientific | 2023 |
| River Labels and Labelling Limited | Manufacturing | 2000 |
| River Oak Marketing Limited | Professional & scientific | 2022 |
| River Publishing & Media Ltd | Administrative & support | 2011 |
| River Rouge Group Limited | Financial services | 2017 |
| River Rouge Ltd | Other services | 2009 |
| River Rouge Property Ltd | Real estate | 2019 |
| River Valley Technologies Limited | Professional & scientific | 2004 |
| River YAR Boatyard Limited | Manufacturing | 2007 |
| Riverie Group Ltd | Professional & scientific | 2026 |
| Riverside Glazing Northants Ltd | Construction | 2022 |
| Riverside Hub Limited | Other services | 2013 |
| Riverside Renovations Northampton Ltd | Construction | 2020 |
| Rivertide Day Nurseries Limited | Education | 1999 |
| Rivett Construction and Finishing Ltd | Construction | 2026 |
| Riviera Bidco Limited | Financial services | 2021 |
| Riviera Holdco 1 Limited | Financial services | 2021 |
| Riviera Holdco 2 Limited | Financial services | 2021 |
| Riviera Midco Limited | Financial services | 2021 |
| Riviera Topco Limited | Financial services | 2021 |
| Riyaara Limited | Wholesale & retail | 2026 |
| RJ Beauty Atelier Ltd | Other services | 2025 |
| RJ Carpenters Ltd | Construction | 2019 |
| RJ Contractors Ltd | Construction | 2026 |
| RJ Developments (Midlands) Ltd | Construction | 2021 |
| RJ Electrical (Essex) Limited | Construction | 2021 |
| RJ Food Consulting Ltd | Professional & scientific | 2022 |
| RJ Goddard & SON Farming Limited | Agriculture & fishing | 2018 |
| RJ Goddard & SON Property Limited | Real estate | 2018 |
| RJ Groupe Ltd | Wholesale & retail | 2020 |
| RJ Wilson Contractors Ltd | Construction | 1998 |
| Rj&Nw Property Limited | Real estate | 2024 |
| RJC Windows (Northampton) Ltd | Construction | 2011 |
| RJC Windows LLP | | 2011 |
| Rjdm Limited | Information & communication | 2003 |
| RJF Warehouse Solutions Limited | Professional & scientific | 2023 |
| RJG Decorations Ltd | Construction | 2023 |
| RJL Project Services Ltd | Professional & scientific | 2010 |
| RJM Maintenance and Cleaning Services Limited | Construction | 2026 |
| RJS Brickwork Limited | Construction | 2025 |
| Rjsm Aerospace and Automotive Ltd | Manufacturing | 2024 |
| RJW Flooring Ltd | Construction | 2023 |
| RK & JB Properties Ltd | Households | 2025 |
| RK 5 Property Limited | Real estate | 2025 |
| RK Enterprise Holdings Limited | Financial services | 2026 |
| RK Furnished Properties Ltd | Real estate | 2024 |
| RK Heating & Plumbing Limited | Construction | 2018 |
| RK Legal Consulting Limited | Professional & scientific | 2023 |
| RK9 Security Limited | Other services | 2019 |
| RKE Properties Ltd | Real estate | 2022 |
| RKF Foods Ltd | Hospitality | 2026 |
| RKH Finance Ltd | Financial services | 2026 |
| RKI Holdings Ltd | Financial services | 2024 |
| RKL Bookkeeping Ltd | Professional & scientific | 2026 |