| Relm Limited | Wholesale & retail | 2018 |
| REM Associates Limited | Administrative & support | 2004 |
| Remal Pick Express Ltd | Transport & logistics | 2025 |
| Rembut General and Solutions Services Ltd | Wholesale & retail | 2017 |
| Remedial Massage Practice Ltd | Health & social care | 2022 |
| Remedoc Limited | Health & social care | 2024 |
| Remepharm Limited | Wholesale & retail | 2024 |
| Remerch Ltd | Wholesale & retail | 2022 |
| Remit RIO Limited | Administrative & support | 2026 |
| Remitco Ltd | Financial services | 2020 |
| Remorin Ltd | Wholesale & retail | 2025 |
| Remote Locum Ltd | Information & communication | 2024 |
| REN HUD Ltd | Other services | 2023 |
| REN Productions Limited | Information & communication | 2016 |
| Renaka Limited | Wholesale & retail | 2021 |
| Renbar Ltd | Real estate | 2024 |
| Renc Consulting Limited | Administrative & support | 2017 |
| Rendlesham Dental Practice and Implant Centre Ltd | Health & social care | 2018 |
| Renea Cosmetics Clinic Ltd | Other services | 2021 |
| Renegade Hospitality Ltd | Hospitality | 2024 |
| Renegade Strength & Fitness Ltd | Arts & recreation | 2013 |
| Renew Arts Ltd | Professional & scientific | 2009 |
| RENEW4U Ltd | Professional & scientific | 2025 |
| Renewable Eco Ltd | Administrative & support | 2022 |
| Renewable Utilities Ltd | Energy | 2010 |
| Rennie Transport Solutions Ltd | Transport & logistics | 2025 |
| Renocraft Group Ltd | Construction | 2026 |
| Renocraft Ltd | Construction | 2023 |
| Renovate Build Design Ltd | Construction | 2025 |
| Renovate NW Limited | Construction | 2009 |
| Renovation Property Team Limited | Construction | 2017 |
| Renown Associates Limited | Professional & scientific | 1999 |
| Rent Great Villas Ltd | Real estate | 2013 |
| Rent ME NOW Limited | Real estate | 2014 |
| Rental Resource Ltd | Real estate | 2024 |
| Rentals ALI Limited | Real estate | 2023 |
| Rentgenie Ltd | Real estate | 2022 |
| Rentline Ltd | Administrative & support | 2024 |
| Rentmeout Limited | Real estate | 2024 |
| Renu Renovations Limited | Construction | 2025 |
| Replikhair Limited | Other services | 2023 |
| Reportsy Ltd | Information & communication | 2024 |
| Repose Spa Environments Ltd | Manufacturing | 2021 |
| Repose Spas UK Limited | Manufacturing | 2025 |
| Represent Clothing Limited | Wholesale & retail | 2014 |
| Repsac Engineering Ltd | Manufacturing | 2016 |
| Reputation North Ltd | Professional & scientific | 2015 |
| Required Technology Ltd | Wholesale & retail | 2019 |
| Reqwiz Limited | Professional & scientific | 2025 |
| RES Contracts Ltd | Construction | 2023 |
| RES Trade Ltd | Extraterritorial | 2013 |
| Reschool Ltd | Information & communication | 2019 |
| Rescue ASSIST24 Ltd | Wholesale & retail | 2011 |
| Rescuemate Technology Ltd | Wholesale & retail | 2021 |
| Research and Development Consultancy Ltd | Information & communication | 2022 |
| Research Economics and Consultancy in Healthcare Limited | Administrative & support | 2011 |
| Reside Residential Ltd | Real estate | 2024 |
| RESIDE24 CIC | Real estate | 2024 |
| Residential Assets Limited | Real estate | 2018 |
| Resilience Bridge CIC | Education | 2025 |
| Resist (Manchester) Ltd | Wholesale & retail | 2024 |
| Resolute Security Ltd | Administrative & support | 2025 |
| Resolv Ltd | Professional & scientific | 2021 |
| Resolve Management Limited | Professional & scientific | 2024 |
| Resonant Studios Limited | Professional & scientific | 2024 |
| Resonate Imaging Ltd | Health & social care | 2019 |
| Resonate Works Ltd | Professional & scientific | 2026 |
| Resource Personnel Limited | Administrative & support | 2016 |
| Resource Waste Recovery Ltd | Water & waste | 2015 |
| Respect Music Ltd | Arts & recreation | 2002 |
| Response & Restore Limited | Construction | 2020 |
| Response Rehab Limited | Other services | 2012 |
| Resroc TOO Limited | Health & social care | 2021 |
| Rest Eazy NW Ltd | Extraterritorial | 2012 |
| Restaurant Staffing Ltd | Administrative & support | 2025 |
| Restockd Ltd | Wholesale & retail | 2025 |
| Restore Finance F1 Limited | Financial services | 2012 |
| Restore Finance Limited | Financial services | 1997 |
| Restricted Events Limited | Administrative & support | 2021 |
| Resurwrecked Repair Specialists Ltd | Construction | 2024 |
| RETA1L Ltd | Real estate | 2022 |
| Retail Business Analysis Limited | Information & communication | 2014 |
| Retail Crush Ltd | Wholesale & retail | 2023 |
| Retailhub Group Ltd | Wholesale & retail | 2021 |
| Retailxpress Ltd | Wholesale & retail | 2025 |
| Retec Group Ltd | Professional & scientific | 2017 |
| Retek Construction Limited | Construction | 2011 |
| Retreat (Adlington) Limited | Hospitality | 2015 |
| Retreat Bromley Cross Limited | Hospitality | 2017 |
| Retreat Restaurants Limited | Hospitality | 2009 |
| Retro Control Limited | Administrative & support | 2009 |
| Retro Living Limited | Wholesale & retail | 2013 |
| Retstone Limited | Financial services | 2001 |
| Reubennwankwo Ltd | Manufacturing | 2020 |
| Revamp Campervans Ltd | Wholesale & retail | 2022 |
| Revattos Bakery Ltd | Hospitality | 2023 |
| Reve Ltd | Wholesale & retail | 2025 |
| Revelle and Co Ltd | Wholesale & retail | 2025 |
| Revelop Ltd | Information & communication | 2022 |
| Reversal Credit Limited | Financial services | 2025 |