| Real Supply Chain Management Co Ltd | Hospitality | 2025 |
| Reason UP Limited | Professional & scientific | 2015 |
| Rebound Design Works Ltd | Professional & scientific | 2025 |
| Rebuild Construction Models Ltd | Construction | 2020 |
| Recruitaid Ltd | Administrative & support | 2021 |
| Rectory House Care Limited | Health & social care | 2024 |
| Red Dimond Service Ltd | Administrative & support | 2023 |
| Red Encrypt Limited | Other services | 2021 |
| Red Fort Security Services Ltd | Administrative & support | 2024 |
| Red Potion Ltd | Information & communication | 2023 |
| Red T Studio Ltd | Professional & scientific | 2022 |
| Redefinecreations Ltd | Wholesale & retail | 2024 |
| Redlands Retail Limited | Administrative & support | 2016 |
| Regen Media Ltd | Information & communication | 2016 |
| Regent Blocktech Ltd | Information & communication | 2019 |
| Rehen Consulting Ltd | Information & communication | 2020 |
| Rehen Properties Limited | Real estate | 2026 |
| Rei-Gi Limited | Arts & recreation | 2010 |
| Reliable Locum Services Limited | Health & social care | 2016 |
| Remitise Group Ltd | Transport & logistics | 2021 |
| Remyck House Ltd | Professional & scientific | 2016 |
| Renovatio Nutrition Ltd | Wholesale & retail | 2019 |
| Rentlord Ltd | Real estate | 2009 |
| Renush Supplies Ltd | Wholesale & retail | 2023 |
| Reprohealth Consulting Limited | Health & social care | 2025 |
| Resolved Plumbing & Drainage Ltd | Construction | 2026 |
| Restan Freight Limited | Transport & logistics | 2026 |
| Restore Performance Rehab Ltd | Health & social care | 2026 |
| Revive Masters Limited | Construction | 2023 |
| Revivointerior Ltd | Construction | 2026 |
| Revyw Ltd | Professional & scientific | 2026 |
| Reynolds Communications Limited | Professional & scientific | 2014 |
| RH Offshore Limited | Professional & scientific | 2018 |
| RHC New Energy Limited | Construction | 2025 |
| Rhov Consulting Limited | Information & communication | 2016 |
| Rich Point Ltd | Hospitality | 2024 |
| Richard Challoner School | Education | 2011 |
| Richard V Services Ltd | Professional & scientific | 2011 |
| Richmede Properties Limited | Real estate | 1981 |
| Richmond Court (Raynes Park) Limited | Professional & scientific | 1998 |
| Riconnect UK Limited | Information & communication | 2023 |
| Right Flow Plumbing & Heating Limited | Construction | 2016 |
| Right SO Ltd | Arts & recreation | 2022 |
| Rijiu Ltd | Wholesale & retail | 2024 |
| RIO Creative Solutions Ltd | Information & communication | 2020 |
| Rise Technology Ltd | Information & communication | 2022 |
| Rishi Express Money Transfer Ltd | Financial services | 2009 |
| Ritual & Grub Ltd | Hospitality | 2021 |
| Ritzi Care Homes Ltd | Health & social care | 2008 |
| Ritzy Lounge Ltd | Hospitality | 2023 |
| Riverside Creative Partners Limited | Professional & scientific | 2020 |
| Riverside Mill Estate Management Limited | Households | 1994 |
| Riverside Residential Ltd | Real estate | 2024 |
| Rizq Property Ltd | Construction | 2026 |
| RJ & SS Holdings Ltd | Real estate | 2025 |
| RK Optom Limited | Professional & scientific | 2025 |
| RKB & Co London Ltd | Households | 2023 |
| RM Driscoll Enterprises Limited | Professional & scientific | 2010 |
| RM2 Corporate Finance Limited | Professional & scientific | 2015 |
| RM2 Employee Ownership Ltd | Professional & scientific | 2002 |
| RM2 Trustees Limited | Administrative & support | 1997 |
| Rmbm Petroleum Limited | Wholesale & retail | 2013 |
| RNA Health Limited | Health & social care | 2021 |
| Robert Heath Group Limited | Administrative & support | 2008 |
| Robert Heath Heating Limited | Construction | 1983 |
| Robert Housing Developer Ltd | Real estate | 2022 |
| Robert Levingston Limited | Construction | 2015 |
| Robfe Ltd | Real estate | 2020 |
| Robhe Ltd | Real estate | 2019 |
| Robinbridge Property Management Limited | Households | 1995 |
| Robrubina (UK) Limited | Hospitality | 2017 |
| Robusto Roasters Ltd | Hospitality | 2024 |
| Rocky Bay Estates Limited | Real estate | 2025 |
| ROI Analytics Ltd | Information & communication | 2022 |
| Rokim UK Ltd | Wholesale & retail | 2021 |
| ROM & Nermo Limited | Real estate | 2026 |
| Romarco Gelato Ltd | Manufacturing | 2026 |
| Roohi Smile Solutions Ltd | Health & social care | 2021 |
| Rookwood Avenue Management Limited | Households | 2023 |
| Rooms 24 Ltd | Real estate | 2020 |
| Rootcause Ltd | Agriculture & fishing | 2012 |
| Ross Itrat Ltd | Other services | 2024 |
| Roti Run Ltd | Hospitality | 2021 |
| Round Castle Ltd | Real estate | 2026 |
| Roxborough Estates Ltd | Real estate | 2020 |
| Rozac Ltd | Wholesale & retail | 2022 |
| Rpcb Prime Ltd | Construction | 2017 |
| Rquintana Ltd | Professional & scientific | 2020 |
| RR Research Ltd | Professional & scientific | 2021 |
| Rrmgroup Ltd | Construction | 2018 |
| RRP Engineering Ltd | Construction | 2015 |
| RRP Real Estate Ltd | Real estate | 2020 |
| RSZ Properties Limited | Real estate | 2018 |
| RT Cars Ltd | Wholesale & retail | 2015 |
| Rtoday Ltd | Construction | 2022 |
| Rubber Turtle Software Ltd | Information & communication | 2025 |
| Rudloe Consultants Limited | Professional & scientific | 2024 |
| Rukhham Limited | Real estate | 2022 |
| Rumble Code Ltd | Information & communication | 2022 |
| Russells Joinery Limited | Manufacturing | 2007 |