| Rizish Ltd | Wholesale & retail | 2021 |
| Rizq Holdings Ltd. | Information & communication | 2019 |
| RJ Clyde (Builders) Limited | Construction | 2003 |
| RJC Consulting & Coaching Ltd | Professional & scientific | 2013 |
| RJC Landscapes Limited | Administrative & support | 2022 |
| RJD2 Limited | Real estate | 2021 |
| RJG & CJG Holdings Limited | Financial services | 2025 |
| RJJ Insulation Ltd | Construction | 2025 |
| Rjplearning Ltd | Administrative & support | 2014 |
| RJS and Sons Flooring Supplies Ltd | Wholesale & retail | 2022 |
| RJT Contractors Limited | Construction | 2025 |
| RK Dynamics Ltd | Information & communication | 2019 |
| Rkps Group Limited | Wholesale & retail | 2025 |
| Rkps Properties Limited | Households | 2025 |
| RM Academy Limited | Information & communication | 2023 |
| Rmag Ltd | Professional & scientific | 2011 |
| RMG Construction & Energy Ltd | Construction | 2018 |
| RMG Construction (London) Limited | Construction | 2016 |
| RMM Corporate Events & Facility Management Limited | Hospitality | 2022 |
| RMR Landscapes Ltd | Administrative & support | 2020 |
| RMS Supply Chain Consulting Limited | Professional & scientific | 2011 |
| Rmtmtm Ltd | Other services | 2022 |
| Rmtrucking Ltd | Other services | 2010 |
| RNL Enterprises Limited | Administrative & support | 2019 |
| RO Nominees Limited | Professional & scientific | 1976 |
| Roads Reconstruction Limited | Professional & scientific | 1934 |
| Roath Renovations Limited | Construction | 2017 |
| Robbie Bronnimann Ltd | Information & communication | 2016 |
| Robert Sheridan Ltd | Professional & scientific | 2013 |
| Robert Willatt and Associates Ltd | Professional & scientific | 2010 |
| Robertson Heating Services Limited | Construction | 2024 |
| Robinson Adventure Golf Ltd | Arts & recreation | 2025 |
| Robinson Residential Sales and Lettings Ltd | Real estate | 2013 |
| Robinsonbado Ltd | Wholesale & retail | 2025 |
| Robito Limited | Wholesale & retail | 2018 |
| Robwill Limited | Real estate | 2023 |
| Rochaan Singh Virdee Ltd. | Construction | 2016 |
| Roci Ltd | Information & communication | 2026 |
| Rockets Science CIC | Education | 2019 |
| Rockindale Properties Ltd | Extraterritorial | 2015 |
| Rockpile Development& Investment Ltd | Real estate | 2021 |
| Rockpool Accounting Ltd | Professional & scientific | 2025 |
| Rocks Construction U.K Limited | Construction | 2025 |
| Rocks Holdings U.K. Limited | Financial services | 2023 |
| Rocksoft IT Ltd | Information & communication | 2018 |
| Rockstar Lighting Limited | Construction | 2015 |
| Rocky Mountain Fabrication Ltd | Professional & scientific | 2021 |
| Roeco Ltd | Public administration | 2014 |
| Roger Levenhagen Consulting Limited | Administrative & support | 2014 |
| Roger White Tailings Consultant Ltd | Mining & quarrying | 2020 |
| Rogue Sheep Films Ltd. | Information & communication | 2014 |
| Rokaz International Limited | Information & communication | 2017 |
| Rolling Sushi Ltd | Hospitality | 2026 |
| Roman Bank Consulting Ltd | Professional & scientific | 2017 |
| Roman Films Limited | Administrative & support | 2019 |
| Romney Hydropower Company Limited | Energy | 2010 |
| RON Smith (Recycling) Limited | Water & waste | 2001 |
| Ronyauq Brand Atelier Limited | Information & communication | 2025 |
| ROO Collectibles Limited | Wholesale & retail | 2026 |
| Rooferco Ltd | Construction | 2025 |
| Rooney CAD Ltd | Administrative & support | 2007 |
| Roots Garden Nursery Limited | Agriculture & fishing | 2009 |
| ROS Collins Dressage Ltd | Agriculture & fishing | 2026 |
| Rosato-Dooey Delivery Limited | Professional & scientific | 2025 |
| Rose Partner Solutions Ltd | Professional & scientific | 2024 |
| Rosha Silk Ltd | Wholesale & retail | 2020 |
| Ross Poole (Cookham) Limited | Other services | 2012 |
| Rossignol Limited | Information & communication | 2013 |
| Royal Flush Plumber Ltd | Construction | 2022 |
| Roygen Property Ltd | Real estate | 2018 |
| RR Accommodation Ltd | Real estate | 2019 |
| RR Screeding Ltd | Construction | 2024 |
| Rrvirk Co. Ltd | Wholesale & retail | 2025 |
| RS Global Commerce Ltd | Wholesale & retail | 2024 |
| RS Mehar Ltd | Transport & logistics | 2025 |
| RS Pharma Solutions Limited | Professional & scientific | 2012 |
| RS Productions Camerman Limited | Information & communication | 2020 |
| RS Spine Ltd | Health & social care | 2023 |
| RSI Investment Properties Ltd | Real estate | 2019 |
| RSL64 Investments | Financial services | 2017 |
| RSZ Electrical Ltd | Construction | 2021 |
| Ruban Limited | Administrative & support | 2007 |
| Rubber Recycling Solutions Limited | Water & waste | 2005 |
| Rubik Solutions Limited | Information & communication | 2005 |
| Rubyzchoice Limited | Wholesale & retail | 2019 |
| Ruchika Punj Limited | Information & communication | 2025 |
| RUG Weavers Limited | Wholesale & retail | 2023 |
| Rugudio Ltd | Manufacturing | 2023 |
| Ruku Consultancy Ltd | Professional & scientific | 2022 |
| Runecast Solutions Limited | Information & communication | 2014 |
| Ruri Properties Ltd | Construction | 2023 |
| Rushington Avenue (Maidenhead) Private Road Management Company Limited | Households | 2026 |
| Rustic Restrooms Limited | Administrative & support | 2022 |
| Rusty Barrow Ltd | Administrative & support | 2024 |
| Ruth Properties Limited | Real estate | 2021 |
| Rutland House 1 Limited | Real estate | 2016 |
| RVA Services Limited | Construction | 2016 |
| RVS Crafts Ltd | Wholesale & retail | 2025 |
| RW Anaesthetics Ltd | Health & social care | 2025 |
| RWS (Overseas) Limited | Financial services | 1971 |