| Reyaan Limited | Extraterritorial | 2020 |
| Reyansh Holding UK Ltd | Wholesale & retail | 2025 |
| Reykab West Harrow Ltd | Administrative & support | 2017 |
| Reyu Holdings Ltd | Financial services | 2023 |
| Rfactory Ltd | Information & communication | 2013 |
| RG & ARG Ltd | Real estate | 2023 |
| RHB Capital Limited | Professional & scientific | 2013 |
| Rheon Holdings Ltd | Information & communication | 2008 |
| Rhino Imports Limited | Wholesale & retail | 2009 |
| Ricca (Pinner) Limited | Health & social care | 2023 |
| Riccado Limited | Wholesale & retail | 2005 |
| Richard Collis Music Ltd | Information & communication | 2018 |
| Richard Keep Limited | Professional & scientific | 2009 |
| Rickayzen Consulting Limited | Professional & scientific | 2020 |
| Rickon Limited | Real estate | 2013 |
| Ridders & Co Ltd | Professional & scientific | 2015 |
| Ridge Manor Limited | Construction | 2017 |
| Ridgway Optical Supplies Limited | Wholesale & retail | 1973 |
| Ridhi Homes Ltd | Real estate | 2026 |
| Ridhyas Real Estate Ltd | Real estate | 2023 |
| Riding High International Limited | Extraterritorial | 2002 |
| Riela Yachts (UK) Ltd | Professional & scientific | 2007 |
| Rilco Ltd | Financial services | 2024 |
| Rina Popat Ltd | Wholesale & retail | 2022 |
| Rinavi Holdings Limited | Financial services | 2025 |
| Ringwood 5 Ltd | Real estate | 2022 |
| Riom Limited | Real estate | 2022 |
| Risborough Consulting Limited | Professional & scientific | 2018 |
| Rise School of Dance Ltd | Arts & recreation | 2021 |
| Rishal Investments Limited | Real estate | 2018 |
| Ritz Eco Facilities Management Limited | Administrative & support | 2018 |
| Riva 30 Limited | Hospitality | 2017 |
| River and ROW Limited | Real estate | 2023 |
| Riverdeck Limited | Hospitality | 2007 |
| Riverly Limited | Health & social care | 2018 |
| Riversdale (Northwest) Limited | Health & social care | 1995 |
| Rivo Holdings Limited | Financial services | 2025 |
| Riya Foods Limited | Hospitality | 2010 |
| Riya Holdings Limited | Financial services | 2019 |
| RJ Xpress Ltd | Wholesale & retail | 2026 |
| Rjcj Health Ltd | Health & social care | 2022 |
| RJJ Leisure Limited | Administrative & support | 2024 |
| RJM Holdings Limited | Real estate | 2025 |
| RK Optics Ltd | Health & social care | 2018 |
| RK Rasoi Limited | Hospitality | 2023 |
| RKP Consultancy Limited | Professional & scientific | 2025 |
| RKT Tele Consultancy Ltd | Information & communication | 2010 |
| Rlch Bakery Ltd | Wholesale & retail | 2022 |
| RM Accounting Limited | Professional & scientific | 2016 |
| RM Artdeco Ltd | Construction | 2016 |
| RM Construct Ltd | Construction | 2020 |
| RM Pipalia Holdings Ltd | Real estate | 2019 |
| RMB Building & Development Limited | Construction | 2016 |
| Rmhcare Ltd | Health & social care | 2016 |
| Rmko Consulting Limited | Information & communication | 2023 |
| RMN Property Holdings Ltd | Real estate | 2026 |
| RMS Fortune Investments Limited | Financial services | 2022 |
| RN Anne Marie Smith Ltd | Health & social care | 2020 |
| RN Ventures Ltd | Wholesale & retail | 2026 |
| Robert & Karin Heath Partnership LLP | | 2017 |
| Robert Adams Search & Selection Limited | Administrative & support | 2013 |
| Roberta Brownbill Ltd | Administrative & support | 2022 |
| Roberts Media Limited | Professional & scientific | 2011 |
| Roberts of London Limited | Construction | 2025 |
| Robinson Road Investments Limited | Construction | 2024 |
| Robinson Road SUB Limited | Real estate | 2025 |
| Roboccino Limited | Information & communication | 2021 |
| Robserb Ltd | Construction | 2023 |
| Roche Estates Limited | Real estate | 2017 |
| Rochester Court Limited | Real estate | 1995 |
| Rockfin Ltd | Professional & scientific | 2018 |
| Roderick Road Limited | Real estate | 2025 |
| Rodriguez Garden Ltd | Professional & scientific | 2022 |
| Roig Property Investments Limited | Real estate | 2020 |
| Roimax Ltd | Real estate | 2019 |
| Roister Limited | Wholesale & retail | 2018 |
| Role Call Limited | Arts & recreation | 2004 |
| Rolis Properties Limited | Real estate | 2015 |
| Roll on Group Ltd | Professional & scientific | 2025 |
| Rolling Thunder Supply Co Ltd | Administrative & support | 2018 |
| Rolltastic Limited | Wholesale & retail | 2025 |
| Rolo Consultancy Ltd | Professional & scientific | 2022 |
| Romanian Cuisine Ltd | Hospitality | 2019 |
| Room Nine Studios Limited | Wholesale & retail | 2025 |
| Roomlab Limited | Wholesale & retail | 2016 |
| Roots Residential Ltd | Real estate | 2024 |
| Roro Properties Management Limited | Real estate | 2021 |
| Rose Dance Academy Limited | Arts & recreation | 2022 |
| Rose Petal Homecare Ltd | Health & social care | 2018 |
| Rosedune Developments Limited | Real estate | 2025 |
| Rosedune Limited | Real estate | 2022 |
| Rosenbauer Consulting Limited | Administrative & support | 2012 |
| Roses and Roses Limited | Information & communication | 2024 |
| Roshni News Limited | Wholesale & retail | 2013 |
| Rossan Ltd | Professional & scientific | 2016 |
| Rossini Property Investments Limited | Real estate | 2020 |
| Rotary Club of Uxbridge Auto Show Limited | Other services | 2004 |
| Rotary Solution Ltd | Professional & scientific | 2024 |
| Rotryng Limited | Real estate | 2018 |
| Rouak Afrik Enterprices Ltd. | Manufacturing | 2018 |