| Qmax Consultancy Limited | Information & communication | 2019 |
| Quantum IT Ltd | Information & communication | 2025 |
| Quantum Leap Cloud & AI Ltd | Information & communication | 2025 |
| Quench Europe Limited | Wholesale & retail | 2023 |
| Quiberon Ltd | Information & communication | 2020 |
| Quick Energy Solution UK Limited | Other services | 2017 |
| Quick Global Constructions Ltd | Construction | 2016 |
| QUICK2KIT Ltd | Wholesale & retail | 2025 |
| Quickmind Learning Ltd | Education | 2021 |
| Quirinus Solutions Limited | Information & communication | 2020 |
| Quomodus Limited | Professional & scientific | 1989 |
| R & J Heating and Plumbing Trade Limited | Administrative & support | 2003 |
| R & M Electrical Limited | Manufacturing | 2003 |
| R a Goncalves Limited | Professional & scientific | 2015 |
| R Cubed Architecture Ltd | Professional & scientific | 2025 |
| R G Windows Ltd | Manufacturing | 2008 |
| R&B Insulation Services Limited | Construction | 2001 |
| R&H Ventures Limited | Real estate | 2020 |
| R&S London Ltd | Wholesale & retail | 2020 |
| R. Grill & Desserts Limited | Hospitality | 2025 |
| R.J. Crown Holdings Limited | Hospitality | 2021 |
| R.S.Constructionwise Limited | Construction | 2017 |
| R12 Botanical Ltd | Manufacturing | 2025 |
| R2GO Ltd | Wholesale & retail | 2025 |
| R4 Transport Ltd | Transport & logistics | 2021 |
| RAA1 Global Limited | Information & communication | 2026 |
| Radha Impex Limited | Wholesale & retail | 2022 |
| Radha Tradelink Ltd | Wholesale & retail | 2025 |
| Radians Worldwide Limited | Manufacturing | 2012 |
| RAI Construction London Ltd | Construction | 2025 |
| Raincore Ltd | Wholesale & retail | 2025 |
| RAM International Investments Limited | Professional & scientific | 2021 |
| Rameshwar Delights Ltd | Wholesale & retail | 2025 |
| Rander Sunni Vohra Panchayat (UK) Ltd | Health & social care | 2008 |
| Rangi Empire Limited | Real estate | 2023 |
| Rangi Executive Cars Limited | Administrative & support | 2025 |
| Ranjo Holding Limited | Construction | 2019 |
| Ranmore CT, Residents Ltd | Households | 2026 |
| Rapid Bridge Capital Limited | Financial services | 2026 |
| Rapid Rent Agent Limited | Real estate | 2018 |
| Rathna Packaging UK Ltd | Administrative & support | 2026 |
| Raunak Transport Ltd | Transport & logistics | 2025 |
| Raviby Ltd | Wholesale & retail | 2025 |
| Ravneet Traders Ltd | Wholesale & retail | 2018 |
| Rays Estate Ltd | Households | 2023 |
| Razgb Ltd | Construction | 2025 |
| RB Delicious Food Ltd | Hospitality | 2017 |
| RBK Properties London Limited | Real estate | 2026 |
| Rboot.Ai Ltd | Information & communication | 2025 |
| RC Industrial Group Limited | Wholesale & retail | 2023 |
| RCL Rail and Civil Ltd | Construction | 2022 |
| RDC Builders Ltd | Construction | 2020 |
| Reach Business Support Ltd | Professional & scientific | 2021 |
| Ready&Gleaming Ltd | Administrative & support | 2025 |
| Real Deep Productions Ltd | Information & communication | 2020 |
| Real Star PVT Ltd | Administrative & support | 2021 |
| Rebecca Searle Photography Ltd | Professional & scientific | 2023 |
| Rebel Gym Limited | Arts & recreation | 2020 |
| Recruitmentcompany Ltd | Real estate | 2025 |
| Redbrick Investment Holdings Ltd | Administrative & support | 2025 |
| Redbrick Rodney Ltd | Real estate | 2025 |
| Reeds Motors Ltd | Wholesale & retail | 2015 |
| Regal Needle Ltd | Manufacturing | 2026 |
| Regatta House Residents Limited | Professional & scientific | 2000 |
| Regency Court (Wraysbury) Management Company Limited(The) | Real estate | 1975 |
| Regents Court (Staines) Limited | Households | 1993 |
| Regium Services Limited | Wholesale & retail | 2017 |
| Reliable in Work Ltd | Administrative & support | 2024 |
| Reliance-Uk Ltd | Wholesale & retail | 2022 |
| Rellus Ltd | Real estate | 2011 |
| Reltio UK Limited | Administrative & support | 2018 |
| Remediation & Restoration Limited | Professional & scientific | 2006 |
| Remon & Co Ltd | Administrative & support | 2013 |
| Rems Group Ltd | Construction | 2025 |
| Renewal Advisory Ltd | Professional & scientific | 2026 |
| Reposeskincare Limited | Manufacturing | 2025 |
| Requestchauffeur Ltd | Transport & logistics | 2025 |
| Resilient Life Ltd | Other services | 2021 |
| Results Fmcg Limited | Professional & scientific | 2023 |
| Retail Dimensions Ltd | Wholesale & retail | 2015 |
| REX Transport Services Ltd | Wholesale & retail | 2016 |
| Rextech UK Private Limited | Information & communication | 2024 |
| RG Travel Luxury Service Ltd | Transport & logistics | 2022 |
| RIA Kashyap Ltd | Wholesale & retail | 2017 |
| Rianal Limited | Real estate | 1977 |
| Ribby and Chez Limited | Professional & scientific | 2013 |
| Richard Sammon (Plumbing Services) Limited | Construction | 2009 |
| Richard Sivers Associates Limited | Administrative & support | 2000 |
| Richmond Renovations Limited | Construction | 2025 |
| Rightitnow Limited | Information & communication | 2013 |
| Risa Property Holdings Limited | Real estate | 2024 |
| Rishika Group Ltd | Construction | 2019 |
| Riva-Ideliver UK Limited | Transport & logistics | 2018 |
| Riva-Logistics UK Limited | Transport & logistics | 2017 |
| River Mews Limited | Households | 2020 |
| Riverbank Global Solutions Ltd | Information & communication | 2021 |
| Rivers Inn Ltd | Hospitality | 2026 |
| Riverside (Residents) Limited | Households | 1969 |
| Riverside Paddock Ltd | Hospitality | 2018 |
| Riverside Tree Specialist Limited | Administrative & support | 2025 |