| Reynolds Bathrooms Ltd | Construction | 2026 |
| RG I.T. Consultancy Limited | Information & communication | 2007 |
| RH Asset Management Consultancy Ltd | Real estate | 2010 |
| Rham Records Ltd | Arts & recreation | 2019 |
| Rhys Hospitality Ltd | Manufacturing | 2023 |
| Rhys Owens Enterprises Ltd | Hospitality | 2024 |
| Rice Dinner Limited | Hospitality | 2026 |
| Richard Beecroft Limited | Professional & scientific | 2020 |
| Richard Court Designs Ltd | Professional & scientific | 2004 |
| Richard LEE Accommodation Ltd | Real estate | 2015 |
| Richard Webb Limited | Information & communication | 2009 |
| Richards Family Holdings Limited | Financial services | 2017 |
| Richards Family Ventures Limited | Financial services | 2023 |
| Richards Heritage Collection Limited | Financial services | 2023 |
| Richline Consulting Ltd | Information & communication | 2020 |
| Ride Advanced Ltd | Professional & scientific | 2025 |
| Rider Engineering Ltd. | Professional & scientific | 2015 |
| Ridgeway KBB Ltd | Wholesale & retail | 2010 |
| Ridleys Coaches Limited | Transport & logistics | 2010 |
| Right Track Courier Ltd | Transport & logistics | 2023 |
| Rikdom Limited | Professional & scientific | 2021 |
| RIM Courier Logistics Limited | Transport & logistics | 2018 |
| Rise Together Events Ltd | Other services | 2024 |
| Riseley Holiday Lets Ltd | Real estate | 2022 |
| Risemark Construction Ltd | Construction | 2022 |
| Risk Reduction Ltd | Professional & scientific | 2004 |
| Rivella Properties Banbury Ltd | Construction | 2017 |
| Rize Management Ltd | Real estate | 2025 |
| RJ Quality Limited | Administrative & support | 2024 |
| RJL Automotive Ltd | Manufacturing | 2020 |
| RKS Gaveston Ltd | Professional & scientific | 2016 |
| RL Marketing Limited | Extraterritorial | 2007 |
| RLS Creative LLP | | 2019 |
| RM Performance Limited | Wholesale & retail | 2016 |
| RO Building Services Ltd | Construction | 2022 |
| RO Homes and Developments Ltd | Construction | 2023 |
| Roadrunner Rigging (Services) Limited | Construction | 2009 |
| Roadrunner Transgroup Ltd | Transport & logistics | 2023 |
| Roadside Recovery Repair Ltd | Wholesale & retail | 2024 |
| Roadstead Limited | Construction | 2011 |
| Robert Scott Publishing Limited | Wholesale & retail | 2003 |
| Robert Sommerlad Ltd | Professional & scientific | 2023 |
| Robert West Design and Development Limited | Professional & scientific | 2017 |
| Robnesta Ltd | Transport & logistics | 2013 |
| Robobike Technology Ltd | Wholesale & retail | 2025 |
| Rocan Products Limited | Manufacturing | 2014 |
| Rochfort and Piper Limited | Wholesale & retail | 2001 |
| Roger Tyers Ltd. | Construction | 2005 |
| Rogers Meter Readings Ltd | Administrative & support | 2020 |
| Rogue Leisure Ltd | Arts & recreation | 2003 |
| Rolls Combe Limited | Administrative & support | 2021 |
| Rolt Films Ltd | Information & communication | 2026 |
| Roma Coffee Limited | Hospitality | 2023 |
| Romeesah Ltd | Real estate | 2018 |
| Roof & Tool Solutions Limited | Construction | 2002 |
| Roof Solutions Limited | Construction | 2010 |
| Roof Solutions.Co.Uk Limited | Construction | 2005 |
| Roofing Megastore Holdings Ltd | Financial services | 2023 |
| Roofing Megastore Limited | Wholesale & retail | 2011 |
| Roofing Solutions Limited | Construction | 2005 |
| Room and Key Lettings Limited | Real estate | 2026 |
| Roots & Circles Ltd | Administrative & support | 2026 |
| Rope Way Management Ltd | Administrative & support | 2020 |
| Rosamund Muir Ltd | Wholesale & retail | 2019 |
| Rosche Paper Limited | Manufacturing | 2021 |
| Rose Heath Properties Ltd | Hospitality | 2024 |
| Rosie & Dexter Limited | Administrative & support | 2016 |
| Rosie and Cooey Limited | Wholesale & retail | 2018 |
| Rosie Clark Tennis Coaching Ltd | Education | 2022 |
| Rosomi Limited | Agriculture & fishing | 2022 |
| Rossanagh Holdings Ltd | Real estate | 2018 |
| Rossrossross Ltd | Information & communication | 2023 |
| Rostock Fulfilment Ltd | Transport & logistics | 2020 |
| Round & Jackson Estate Agents Limited | Real estate | 2017 |
| Roundford Limited | Wholesale & retail | 1980 |
| Roundtable Agency Limited | Professional & scientific | 2014 |
| Rowan Engineering Limited | Manufacturing | 2008 |
| Rowe Associates Limited | Professional & scientific | 2014 |
| ROX Couriers Limited | Transport & logistics | 2020 |
| ROY Hall Limited | Water & waste | 2021 |
| Royce Lingerie Limited | Manufacturing | 1991 |
| Roza Healthcare Ltd | Health & social care | 2018 |
| RPX2 Consulting Limited | Professional & scientific | 2007 |
| RPX2 Limited | Professional & scientific | 2002 |
| RROCHA23 Limited | Wholesale & retail | 2019 |
| RS Burger Shack and Bakes Ltd | Hospitality | 2023 |
| RS Developments Harrow Ltd | Real estate | 2026 |
| RS Station Taxis Limited | Transport & logistics | 2023 |
| RSG & Co. Ltd | Administrative & support | 2009 |
| RT Bookkeeping Ltd | Professional & scientific | 2011 |
| Rtrailerhire Ltd | Administrative & support | 2025 |
| Ruban Enterprise Ltd | Wholesale & retail | 2021 |
| Ruby Life Global Limited | Extraterritorial | 2026 |
| Ruby Life Ltd. | Health & social care | 2014 |
| Ruck & Maul Limited | Extraterritorial | 2010 |
| Rudr Yachting Ltd | Administrative & support | 2026 |
| Ruk-A-Tuk International Ltd | Arts & recreation | 2021 |
| Rule Associates Limited | Professional & scientific | 2018 |
| Rule Number 4 Limited | Manufacturing | 2025 |
| Rumbl Limited | Information & communication | 2017 |