| Redline Recruitment Ltd | Administrative & support | 2024 |
| Redolence Ltd | Wholesale & retail | 2025 |
| Redwoods Accountancy Services Ltd | Professional & scientific | 2015 |
| Redwoods Company Services Ltd | Administrative & support | 2024 |
| Reengineering Strategy Solutions Limited | Information & communication | 2020 |
| Reevesgate Farm Limited | Agriculture & fishing | 2021 |
| Regis New Homes Limited | Construction | 2015 |
| Reliance Fire & Security Ltd | Administrative & support | 2015 |
| Reliance Residential Limited | Real estate | 2015 |
| Relocation Consultancy Limited | Professional & scientific | 2025 |
| Remarkable FM Limited | Construction | 2022 |
| Remote Accounts & Admin Ltd | Professional & scientific | 2019 |
| Remote Advanced Stabilised Platforms Limited | Professional & scientific | 2012 |
| Remote Medex Ltd | Other services | 2014 |
| Renai's Residences Ltd | Real estate | 2023 |
| Renake Designs Ltd | Extraterritorial | 2013 |
| Renas Digital Ltd | Information & communication | 2025 |
| Rendwall & Insulation Ltd | Construction | 2021 |
| Renmech Services Ltd | Construction | 2022 |
| Renovate Build Ltd | Construction | 2015 |
| Renovatio Group Ltd | Wholesale & retail | 2022 |
| Rental LUX Ltd | Wholesale & retail | 2020 |
| REP Room Gym Ltd | Arts & recreation | 2023 |
| Revend Corp Limited | Wholesale & retail | 2026 |
| Rewc Ltd | Professional & scientific | 2023 |
| Rexon Property Group Ltd | Real estate | 2026 |
| Reynolds Catering Supplies Limited | Wholesale & retail | 1994 |
| Reynolds Farming Company Limited | Agriculture & fishing | 2025 |
| Reyprop Limited | Real estate | 2019 |
| Rezvanoglu Ltd | Wholesale & retail | 2021 |
| RG & Partners Ltd | Administrative & support | 2026 |
| Rhje Nails Ltd | Other services | 2025 |
| RIA Consult Ltd | Information & communication | 2014 |
| Richard James Investment Solutions Limited | Professional & scientific | 2015 |
| Rickie Rankin (Holdings) Ltd | Real estate | 2021 |
| Ricotta Transport Limited | Transport & logistics | 2007 |
| Ricotta Transport Services Limited | Administrative & support | 2014 |
| Ridforce Ltd | Wholesale & retail | 2024 |
| Ridgeway Residential Management Company Limited | Households | 2015 |
| Riley Engineers Ltd | Education | 2025 |
| Rima Data Consulting Limited | Information & communication | 2010 |
| Rimux Limited | Construction | 2016 |
| RIN Group Limited | Financial services | 2022 |
| Ringo Transport Limited | Transport & logistics | 2015 |
| Ripmax Europe Ltd | Extraterritorial | 2015 |
| Ripmax.De Ltd | Extraterritorial | 2015 |
| Ripplai Ltd | Information & communication | 2026 |
| Rite Mess Ltd | Arts & recreation | 2026 |
| Ritish Venkama Limited | Manufacturing | 2020 |
| River Brightly Ltd | Wholesale & retail | 2025 |
| River Wandle Ltd | Real estate | 2016 |
| River Wandle Two Limited | Real estate | 2023 |
| Riverain Battersea Property Investment Ltd | Real estate | 2023 |
| Riverain Sloan Building Property Investment Ltd | Real estate | 2023 |
| Riverleas Ventures Limited | Real estate | 2025 |
| Rizvi Driving Ltd | Transport & logistics | 2019 |
| RJ GAS Limited | Manufacturing | 2017 |
| RJ Retailing Ltd | Wholesale & retail | 2023 |
| RJC Resourcing Ltd | Other services | 2015 |
| RJH Electrical Jointing Solutions Ltd | Construction | 2024 |
| RJW Roofing Solutions Ltd | Construction | 2023 |
| RKP Dentistry Limited | Health & social care | 2022 |
| RMK Autos Ltd | Wholesale & retail | 2018 |
| RMT Holdings London Ltd | Real estate | 2023 |
| RO Cladding Ltd | Construction | 2020 |
| Roadway Trading Ltd | Wholesale & retail | 2019 |
| Roaming Consultants Limited | Professional & scientific | 2018 |
| Robert West Consulting Limited | Professional & scientific | 1994 |
| Robert West Group Limited | Professional & scientific | 2011 |
| Roberto and Co Estate Agents Ltd | Real estate | 2021 |
| Robin Food Distribution Ltd | Wholesale & retail | 2019 |
| Robinson Sterling Limited | Professional & scientific | 2007 |
| Robjun Limited | Professional & scientific | 2004 |
| Robosoft (UK) Limited | Wholesale & retail | 1997 |
| Rocket Ryan Limited | Extraterritorial | 2020 |
| Rocketroute Limited | Information & communication | 2010 |
| Rockit Event Production Ltd | Administrative & support | 2007 |
| Rococo Beauty Limited | Other services | 2019 |
| Rococo Hairdressing Limited | Other services | 2004 |
| Rocys Ltd | Construction | 2008 |
| ROD & Kyle Property Services Limited | Real estate | 2022 |
| Roda Consultancy Limited | Financial services | 2018 |
| Rohcna Limited | Hospitality | 2020 |
| Roma Food & Drink Limited | Wholesale & retail | 2024 |
| Romajone Ltd | Professional & scientific | 2024 |
| Romanita Ltd | Wholesale & retail | 2019 |
| Roots Marketplace Ltd | Information & communication | 2025 |
| Ropecastle Limited | Hospitality | 1981 |
| ROS Interior Limited | Professional & scientific | 2016 |
| Rose Bloom Investments Limited | Financial services | 2024 |
| Rosedale Sports Club (Trading) Limited | Administrative & support | 2024 |
| Rosewell Goods Limited | Wholesale & retail | 2025 |
| Rosewood Wade Limited | Professional & scientific | 2015 |
| Rosey Ltd | Administrative & support | 2006 |
| Roshvi Property Management Limited | Real estate | 2017 |
| Rostam Properties Ltd | Real estate | 2025 |
| Rovia Cars Ltd | Wholesale & retail | 2020 |
| RPW Trading Ltd | Wholesale & retail | 2023 |
| RR Automotive Ltd | Wholesale & retail | 2025 |
| RS Site Solutions Limited | Construction | 2025 |