| Red Lion Bicker Limited | Construction | 2019 |
| Red Lion Bicker Two Ltd | Construction | 2020 |
| Red Lion Butterwick Properties Limited | Construction | 2021 |
| Red Lion Construction Limited | Construction | 2019 |
| Red Lion Enterprise Properties Limited | Real estate | 2010 |
| Red Lion Warmington Limited | Hospitality | 2022 |
| Red Lion Wide Bargate Limited | Construction | 2021 |
| Red Lion Wide Bargate Management Limited | Real estate | 2026 |
| Red MAX Logistic Ltd | Transport & logistics | 2017 |
| Red Oak Investments Limited | Real estate | 1997 |
| Red on Group Ltd | Administrative & support | 2021 |
| Red Panda Consulting Ltd | Information & communication | 2023 |
| Red Peak Ltd | Professional & scientific | 2019 |
| Red Peony 51 Ltd | Other services | 2026 |
| Red Pistons Garage Ltd | Wholesale & retail | 2025 |
| Red Rainbow Textiles Ltd | Manufacturing | 2014 |
| Red Robin Toys Limited | Manufacturing | 2015 |
| Red Roof Developments Limited | Construction | 2018 |
| Red Roof Property Limited | Real estate | 2016 |
| Red Square Russian Ltd | Information & communication | 2017 |
| Red Squirrel 1724 Limited | Professional & scientific | 2024 |
| Red Star Commercial Exports UK Ltd | Wholesale & retail | 2020 |
| Red Tree Real Estate Limited | Real estate | 2021 |
| Red Wings Deliveries Ltd | Transport & logistics | 2024 |
| Redbox PAY (Umbrella) Ltd | Professional & scientific | 2016 |
| Redbug IT Limited | Information & communication | 2016 |
| Redcot Mews Management Company Limited | Households | 1990 |
| Redelf 2024 Ltd | Administrative & support | 2012 |
| Redema Interiors Ltd | Construction | 2023 |
| Redfin Media Limited | Administrative & support | 2012 |
| Redgreen Engineering Consultancy Limited | Administrative & support | 2008 |
| Redkite Team Ltd | Construction | 2022 |
| Redkite Wood Products Ltd | Wholesale & retail | 2014 |
| Redleaf Woodland Management Limited | Agriculture & fishing | 2019 |
| Redlettercribsignature Limited | Information & communication | 2022 |
| Redline DTP Studio Ltd | Information & communication | 2018 |
| Redmile Properties Ltd | Real estate | 2019 |
| Redpoint Services Ltd | Professional & scientific | 2019 |
| Redsquirrel Pictures Ltd | Professional & scientific | 2016 |
| Redstone Property Ltd | Wholesale & retail | 2016 |
| Redwood Mgmt Ltd | Real estate | 2022 |
| Reed Howard Property Limited | Real estate | 2024 |
| Reef Zlements Ltd | Manufacturing | 2020 |
| Reeve Developments Ltd | Real estate | 2006 |
| Reevue Ltd | Information & communication | 2025 |
| Refine AM Limited | Real estate | 2022 |
| Refined Floors Ltd | Construction | 2025 |
| Reflection UK East Ltd | Construction | 2019 |
| Reflection UK Property Ltd | Real estate | 2024 |
| Refresh Floors Limited | Construction | 2017 |
| REG Engineering Ltd | Construction | 2018 |
| Regal Automotive Ltd | Wholesale & retail | 2025 |
| Regal Libas Ltd | Wholesale & retail | 2017 |
| Regal Park Financial Limited | Financial services | 2016 |
| Regal Park Property Company Limited | Real estate | 2014 |
| Regal Park Property Management Limited | Real estate | 2014 |
| Regbistas Transport Ltd | Transport & logistics | 2018 |
| Regency Contracting Ltd | Construction | 2018 |
| Regency Mews (Kettering) Management Company Limited | Households | 2003 |
| Regency Prop Ltd | Real estate | 2025 |
| Regional Care Peterborough Limited | Health & social care | 2023 |
| Regionalcare Cambridge Limited | Health & social care | 2018 |
| Regionalcare Support Services Limited | Health & social care | 2018 |
| Regis Properties Limited | Construction | 2013 |
| Regular Dads Club Ltd | Other services | 2026 |
| Regworld Limited | Real estate | 2007 |
| REH Estates C Limited | Real estate | 2018 |
| REH Estates D Limited | Real estate | 2018 |
| REH Estates E Limited | Real estate | 2022 |
| REH Estates F Limited | Real estate | 2022 |
| REH Estates G Limited | Real estate | 2022 |
| Reha Corporation Limited | Wholesale & retail | 2025 |
| Rehearsal Room Ltd | Arts & recreation | 2026 |
| Rehoboth 26 Limited | Health & social care | 2012 |
| Rehoboth Global Services Ltd | Transport & logistics | 2024 |
| Reideco Limited | Professional & scientific | 2017 |
| Reignite Careers Limited | Professional & scientific | 2025 |
| Reinaldo Security Services Limited | Administrative & support | 2019 |
| Reinhard Limited | Real estate | 1990 |
| Reinsons Ltd | Wholesale & retail | 2019 |
| Rejuvenate & Restore Limited | Other services | 2025 |
| Reko Logistics Ltd | Transport & logistics | 2016 |
| REL Tendring Ltd | Transport & logistics | 2024 |
| Relative Property Limited | Real estate | 2003 |
| Relax With WAX Ltd | Wholesale & retail | 2019 |
| Relax&Ride Limited | Transport & logistics | 2025 |
| Relay Installations Ltd | Information & communication | 2016 |
| Relay Site Services Ltd | Administrative & support | 2026 |
| Relcap Homes Limited | Construction | 2014 |
| Relcap Limited | Construction | 2014 |
| Relentless Desires Ltd | Manufacturing | 2024 |
| Relentless Welding & Powder Coating Ltd | Manufacturing | 2023 |
| Reliable Cars Bedford Ltd | Wholesale & retail | 2022 |
| Reliable MST Ltd | Wholesale & retail | 2018 |
| Reliance RAK Cars Ltd | Wholesale & retail | 2020 |
| Reliant Carers Limited | Administrative & support | 2023 |
| Reliant Cleaning Limited | Administrative & support | 2023 |
| Reliant Resourcing Limited | Administrative & support | 2023 |
| Reliant Travels Ltd | Transport & logistics | 2021 |
| Reline-Drains Limited | Manufacturing | 2022 |