| Read Project Consultancy Ltd | Professional & scientific | 2019 |
| Ready Packed & Go Ltd | Hospitality | 2025 |
| Ready Security Limited | Construction | 2015 |
| Ready Steady Go Autos Ltd | Wholesale & retail | 2021 |
| Ready Steady Go Online Ltd | Professional & scientific | 2021 |
| Ready Steady Swim Kids Limited | Education | 2025 |
| Readydebygo Limited | Professional & scientific | 2020 |
| Readyr Ltd | Wholesale & retail | 2022 |
| Real - Time Courier Services Limited | Transport & logistics | 2021 |
| Real Care Recruitment Limited | Health & social care | 2015 |
| Real Conveyancing Solutions Limited | Professional & scientific | 2024 |
| Real Flooring Solutions Ltd | Construction | 2010 |
| Real Heating Solutions Limited | Construction | 2017 |
| Real Legal People Limited | Professional & scientific | 2010 |
| Real Oak Properties Ltd | Real estate | 2025 |
| Real Paranormal Ltd | Administrative & support | 2025 |
| Real World Group Limited | Professional & scientific | 2001 |
| Realfade Limited | Financial services | 2017 |
| Realined Alternative Provision Ltd | Education | 2026 |
| Realise Health Limited | Administrative & support | 2004 |
| Realist Global Ltd | Wholesale & retail | 2026 |
| Realistic Property Solutions Limited | Real estate | 2016 |
| Realistic Solutions Holdings Limited | Administrative & support | 2016 |
| Reality Cheques Ltd | Professional & scientific | 2023 |
| Reality Locums Ltd | Health & social care | 2023 |
| Reallo Commercial Ltd | Real estate | 2021 |
| Reallo Ltd | Real estate | 2021 |
| Really Indian Limited | Manufacturing | 2011 |
| Really Solutions Ltd | Manufacturing | 2022 |
| Realm of Vegan Limited | Wholesale & retail | 2013 |
| Realm TCG Trading Ltd | Wholesale & retail | 2024 |
| Realtcloud Ltd | Information & communication | 2023 |
| Realterm Ltd | Real estate | 2006 |
| Realthy Ltd | Information & communication | 2025 |
| Realworld MS Ltd | Information & communication | 2024 |
| Realworld Partnership LLP | | 2013 |
| Reamarc Ltd | Information & communication | 2024 |
| Reap Trading Limited | Wholesale & retail | 2009 |
| Rear Guard Consulting Ltd | Professional & scientific | 2025 |
| Reasch Care 2024 Limited | Health & social care | 2023 |
| Reasch Development Solutions Limited | Extraterritorial | 2020 |
| Reasoner Consultancy Ltd | Administrative & support | 2015 |
| Rebanho Ltd | Hospitality | 2022 |
| Rebecca Baker Designs Ltd | Professional & scientific | 2019 |
| Rebecca Express Limited | Transport & logistics | 2025 |
| Rebecca Lait Limited | Other services | 2004 |
| Rebecca Logistics Ltd | Transport & logistics | 2024 |
| Rebecca Rhoades Ltd | Wholesale & retail | 2021 |
| Rebel Architecture Ltd | Information & communication | 2019 |
| Rebel Creatives Ltd | Other services | 2017 |
| Rebel Digital Limited | Information & communication | 2022 |
| Rebel Hive Collective Ltd | Professional & scientific | 2024 |
| Rebel Management & Promotions Ltd | Hospitality | 2024 |
| Rebel Roche Ltd | Arts & recreation | 2020 |
| Rebel Trading Events Ltd | Administrative & support | 2025 |
| Rebellion Life Ltd | Other services | 2022 |
| Rebeltots Dance Ltd | Arts & recreation | 2020 |
| Reblgreen Software Ltd | Information & communication | 2018 |
| Reboost Bar Ltd | Wholesale & retail | 2023 |
| Reborn Group Ltd | Manufacturing | 2026 |
| Rebsa Investments Ltd | Real estate | 2020 |
| Rebton 1 | Financial services | 2014 |
| Rebton 2 | Financial services | 2014 |
| Rebton 3 | Financial services | 2014 |
| Rebton 4 | Financial services | 2014 |
| Rebton 5 | Financial services | 2014 |
| Rebuild Italy Limited | Construction | 2013 |
| Rebuildingsociety.Com Ltd | Financial services | 2011 |
| Rebuilto Ltd | Construction | 2026 |
| REC Logistic Ltd | Transport & logistics | 2023 |
| RECB1 Construction Peakswater Ltd | Construction | 2025 |
| RECB1 Ltd | Construction | 2018 |
| Recharge Float Centre Ltd | Other services | 2019 |
| Rechovot International Group Ltd | Professional & scientific | 2020 |
| Reclaimed Doors UK Ltd | Wholesale & retail | 2017 |
| Reclaimed Floorboards Limited | Construction | 2026 |
| Recoded Labs Limited | Information & communication | 2018 |
| Recognised Business Solutions Limited | Administrative & support | 2005 |
| Recomend Ltd | Information & communication | 2025 |
| Recommended Consultants Limited | Administrative & support | 2008 |
| Recops (Leeds) Limited | Administrative & support | 2021 |
| Recotect Sports Ltd | Wholesale & retail | 2024 |
| Recovery Float Ltd | Other services | 2023 |
| Recovery Runners Lero Community Interest Company | Health & social care | 2025 |
| Recoveryall Limited | Professional & scientific | 2026 |
| Recoveryboxleeds Ltd | Other services | 2025 |
| Recoverykensworth Ltd | Real estate | 2010 |
| Recreational Charter Insurance Services Limited | Information & communication | 2006 |
| Recruit Cloud Ltd | Information & communication | 2013 |
| Recruit Engineering Limited | Administrative & support | 2024 |
| Recruit Genie (Europe) Ltd | Information & communication | 2019 |
| Recruit Genie Limited | Information & communication | 2019 |
| Recruit Health Experts Ltd | Administrative & support | 2018 |
| Recruit Moore Ltd | Administrative & support | 2015 |
| Recruit&Construct Ltd | Construction | 2019 |
| Recruitex Limited | Professional & scientific | 2010 |
| Recruitgtr Ltd | Professional & scientific | 2022 |
| Recruiting Stars Marketing Ltd | Administrative & support | 2025 |
| Recruitme Ltd | Administrative & support | 2021 |
| Recruitment @ VAL Wade Limited | Administrative & support | 1999 |