| Raytax Limited | Professional & scientific | 2008 |
| RAZ Barber Warrington Ltd | Other services | 2025 |
| RB 06 Limited | Real estate | 2017 |
| RB 3 Limited | Construction | 2017 |
| RB 4 Limited | Real estate | 2017 |
| RB Advisory Ltd | Professional & scientific | 2018 |
| RB Procurement Consulting Limited | Professional & scientific | 2016 |
| RB Static Design Services Limited | Professional & scientific | 2021 |
| RB Tax Services Limited | Professional & scientific | 2025 |
| Rbdj Limited | Construction | 2018 |
| RBDJ2 Limited | Construction | 2018 |
| RBI Consultants Ltd | Administrative & support | 2025 |
| RBI Midlands Limited | Administrative & support | 2024 |
| RBI Surveying Limited | Construction | 2024 |
| RBM Maintenance Limited | Administrative & support | 2017 |
| RBS 1 Limited | Real estate | 2021 |
| RC Business & Engineering Ltd | Administrative & support | 2025 |
| RC Compliance Ltd | Construction | 2023 |
| RC Education Consulting Ltd | Professional & scientific | 2016 |
| RC Merry Limited | Administrative & support | 2016 |
| RC Programme Consultancy Services Ltd | Administrative & support | 2024 |
| Rcaf VI Mallard Group Limited | Professional & scientific | 2014 |
| Rcaf VI Mallard Holdings Limited | Professional & scientific | 2014 |
| RCD Catering Ltd | Hospitality | 2025 |
| RCD Tutoring Limited | Administrative & support | 2025 |
| RCE Civil Engineering Ltd | Administrative & support | 2025 |
| RCH Legal Consultants Limited | Professional & scientific | 2023 |
| RCS (NW) Limited | Financial services | 2023 |
| RCS Aerospace Limited | Administrative & support | 2010 |
| Rcube by Three Sisters Ltd | Wholesale & retail | 2025 |
| RD Compliance Limited | Professional & scientific | 2017 |
| RD Mechanical and Electrical Ltd | Construction | 2019 |
| RD MHE Training Limited | Administrative & support | 2015 |
| RD9.ENTERPRISE Ltd | Wholesale & retail | 2026 |
| Rdcr Limited | Professional & scientific | 2018 |
| RDH Group Limited | Financial services | 2023 |
| RDH Property Services Limited | Construction | 2014 |
| Rdlpaz Ltd | Administrative & support | 2024 |
| Rdsi Limited | Extraterritorial | 2013 |
| RDY Bold Ltd | Hospitality | 2023 |
| RE Global-Tech Ltd | Administrative & support | 2019 |
| Re-Alitek Ltd | Professional & scientific | 2018 |
| Re-Store-Ation Coaching C.I.C. | Health & social care | 2024 |
| Re-Thai-Ment Limited | Professional & scientific | 2023 |
| Re-Use of Public Sector Information (RAG) Limited | Information & communication | 2026 |
| RE3D Limited | Administrative & support | 2025 |
| Reactivelabs Ltd | Information & communication | 2017 |
| Readeris Ltd | Professional & scientific | 2022 |
| Readyline Ltd | Wholesale & retail | 2018 |
| Reagan Hope Ltd | Health & social care | 2022 |
| Reagan Hope Properties Ltd | Real estate | 2023 |
| Real 5 Estates Limited | Real estate | 2020 |
| Real Financial Planning Limited | Financial services | 2009 |
| Real Foods Ltd Limited | Hospitality | 2016 |
| Real Handful Ltd | Manufacturing | 2013 |
| Real Silver Bling Ltd | Wholesale & retail | 2014 |
| Realis Soft Ltd | Information & communication | 2024 |
| Realist Academy CIC | Arts & recreation | 2025 |
| Realll Support CIC | Other services | 2026 |
| Realta Consulting Limited | Professional & scientific | 2019 |
| Realta Holdings Limited | Professional & scientific | 2021 |
| Realtech Data Solutions Ltd | Professional & scientific | 2017 |
| Realtime Distribution Limited | Wholesale & retail | 1993 |
| Reargrove Limited | Administrative & support | 1983 |
| REB Engineering Limited | Professional & scientific | 2017 |
| REB Racing Limited | Arts & recreation | 2023 |
| Rebadan Limited | Real estate | 2020 |
| Rebalance Dog Training Ltd | Other services | 2025 |
| Rebanad Limited | Real estate | 2020 |
| Rebecca Emilie Events & Catering Ltd | Hospitality | 2025 |
| Rebecca Hairworld Salon Ltd | Other services | 2025 |
| Rebecca Percival Coaching Ltd | Information & communication | 2020 |
| Rebecca Ruth Consulting Limited | Administrative & support | 2025 |
| Rebecca Wray Coaching Consultancy Ltd | Administrative & support | 2016 |
| Rebekah Bailey Ltd | Professional & scientific | 2008 |
| Rebel Star Ltd | Hospitality | 2020 |
| Rebel Yell Ltd | Professional & scientific | 2016 |
| Rebosella Limited | Health & social care | 2015 |
| Rebound Productions Limited | Manufacturing | 2019 |
| Rebus Fintech SKP Ltd | Information & communication | 2025 |
| Reckoner Consulting Limited | Professional & scientific | 2014 |
| Record CAD Ltd | Professional & scientific | 2024 |
| Recoules Legal Limited | Information & communication | 2018 |
| Recoup Design Limited | Construction | 2022 |
| Recruit 4U Ltd | Administrative & support | 2024 |
| Rectico Ltd | Manufacturing | 2025 |
| Recycle Rewards Ltd | Information & communication | 2026 |
| Recycle UK Clothing Limited | Wholesale & retail | 2023 |
| Red & Joe's Ltd | Wholesale & retail | 2021 |
| Red 25 Forensics Ltd | Education | 2019 |
| Red Box Limited | Wholesale & retail | 1999 |
| Red Bricks Housing (UK) Ltd | Real estate | 2025 |
| Red CAN Marketing Limited | Professional & scientific | 2024 |
| Red Cell (UK) Ltd | Other services | 2009 |
| Red Coates Holding Ltd | Financial services | 2024 |
| Red Convenience Ltd | Wholesale & retail | 2025 |
| Red Dog Talent Solutions Ltd | Administrative & support | 2024 |
| Red EMU Limited | Information & communication | 2018 |
| Red Estates Ltd | Construction | 2012 |
| Red Flame Marketing Limited | Professional & scientific | 2025 |