| Raef Limited | Education | 2012 |
| Raef Property Limited | Real estate | 2025 |
| Raethuis LLP | | 2016 |
| Rafters and Roses Ltd | Real estate | 2016 |
| RAG River Holdings Ltd | Real estate | 2025 |
| Ragged OUT Ltd | Administrative & support | 2023 |
| RAI and Sons Trading Ltd | Wholesale & retail | 2025 |
| Railsite Telecom International Limited | Information & communication | 2019 |
| Rainbow Lounge Limited | Hospitality | 2022 |
| Rainbow Renewables Ltd | Construction | 2008 |
| Rakp Groundworks Limited | Construction | 2024 |
| RAM Scaffolding (UK) Limited | Construction | 2002 |
| Rana Psychiatry Ltd | Health & social care | 2022 |
| Randomsnail Ltd | Water & waste | 2026 |
| Rapid Fuel Rescue Ltd | Wholesale & retail | 2024 |
| RAW Pearls Limited | Manufacturing | 2002 |
| Rawlings Property Investments Limited | Real estate | 2022 |
| RAY C Smith Limited | Construction | 1959 |
| Ray's VEG Ltd. | Agriculture & fishing | 2009 |
| Rayan Market Ltd | Wholesale & retail | 2026 |
| Raymond Farming Limited | Agriculture & fishing | 2007 |
| Rayta Ltd | Construction | 2025 |
| Razi Enterprises Ltd | Administrative & support | 2020 |
| RB7 Design Limited | Information & communication | 2004 |
| RBA Consulting Ltd | Administrative & support | 2024 |
| RC Ireland Ltd | Financial services | 2024 |
| Rcolville Ltd | Other services | 2025 |
| RCS Care Solutions Ltd | Health & social care | 2022 |
| Rcwilliams Health&Safety Ltd | Construction | 2026 |
| RD1 Security Ltd | Administrative & support | 2021 |
| Rdev Ltd. | Administrative & support | 2017 |
| RDH International Ltd | Professional & scientific | 2021 |
| RDW Plumbing and Heating Ltd | Administrative & support | 2017 |
| Re-Think Life Limited | Other services | 2019 |
| Re:Dsgn Ltd | Professional & scientific | 2015 |
| Re:Work Ltd | Education | 1999 |
| Reacteev UK Ltd | Professional & scientific | 2022 |
| Reading Steelfixing Ltd | Construction | 2019 |
| Real Bristol Bakery Ltd | Manufacturing | 2019 |
| Real Growth Ltd | Professional & scientific | 2024 |
| Rebecca Conway Studio Ltd | Professional & scientific | 2021 |
| Rebecca MAY Legal Project Consultancy Limited | Professional & scientific | 2025 |
| Rebecca Symons Ltd | Real estate | 2025 |
| REBEL360 Limited | Professional & scientific | 2021 |
| Rebels Rugby Limited | Arts & recreation | 2020 |
| Rechtshulpzekerheid LLP | | 2018 |
| Recover Studios UK Limited | Wholesale & retail | 2025 |
| Red Cactus Creative Limited | Information & communication | 2009 |
| Red Case Investments Ltd | Financial services | 2019 |
| Red Deer Country Lettings Limited | Real estate | 2013 |
| Red Deer Country Limited | Real estate | 2012 |
| Red Flint LLP | | 2020 |
| Red Hot Media, Marketing & Events Ltd | Professional & scientific | 2017 |
| Red Latitude Ltd | Professional & scientific | 2018 |
| Red Squirrel Agencies Limited | Wholesale & retail | 2020 |
| Red Squirrel Retail Limited | Wholesale & retail | 2021 |
| Red Tiger Foods Ltd | Manufacturing | 2018 |
| Redcards Ltd | Information & communication | 2019 |
| Redcoat Engineering Limited | Manufacturing | 2007 |
| Redd International Limited | Professional & scientific | 2023 |
| Reddysgroup Ltd | Wholesale & retail | 2022 |
| Redfront Service Design Limited | Professional & scientific | 2011 |
| Redgate Farming Ltd | Agriculture & fishing | 2025 |
| Redish Holdings Limited | Extraterritorial | 2021 |
| Redlake Site Services Limited | Other services | 2008 |
| Redport Limited | Professional & scientific | 2002 |
| Reds Hair Salon Southwest Limited | Other services | 2013 |
| Redwood Rentals Ltd | Real estate | 2020 |
| Redwoods Properties Ltd | Real estate | 2018 |
| Redwoods Travel Limited | Transport & logistics | 2007 |
| Reed Developments (Taunton) Limited | Construction | 2003 |
| Reed Holland Associates Limited | Professional & scientific | 2004 |
| Reed Tiverton Limited | Education | 2018 |
| Reeds Developments Ltd | Construction | 2020 |
| Reeds Estates Ltd | Real estate | 2025 |
| Reekap Property Ltd | Real estate | 2025 |
| Reeks Properties Ltd | Real estate | 2025 |
| Refactor Cloud Limited | Information & communication | 2022 |
| Reformer Pilates Bicester Limited | Health & social care | 2024 |
| Reformhuis Schaper LLP | | 2011 |
| Refresh Commercial Ltd | Construction | 2006 |
| Refresh Living NO. 1 Ltd | Real estate | 2013 |
| Refresh Living NO. 2 Ltd | Construction | 2013 |
| Refresh Living NO. 3 Ltd | Real estate | 2009 |
| Refresh Living NO. 5 Ltd | Real estate | 2018 |
| Refresh Living NO. 6 Ltd | Real estate | 2022 |
| Refresh Living NO. 7 Ltd | Real estate | 2025 |
| Refresh Living NO. 8 Ltd | Real estate | 2025 |
| Refresh Living NO.4 Limited | Real estate | 2015 |
| Refresh Property Group Ltd | Professional & scientific | 2016 |
| Regency Mews (Taunton) Management Limited | Households | 2008 |
| Regent Consult & Trade Limited | Wholesale & retail | 2018 |
| Regent ST Leasehold Ltd | Real estate | 2024 |
| Registered Care Providers Association Limited | Other services | 2008 |
| Regron Plumbing & Heating Ltd | Construction | 2022 |
| REH & LA Hayes Limited | Agriculture & fishing | 2020 |
| Relational Systems Consultancy Ltd | Professional & scientific | 2025 |
| Reloved Emporium Limited | Wholesale & retail | 2024 |
| Remabo LLP | | 2012 |
| Reman Holdings Limited | Financial services | 2017 |