| READY4KICKIN Ltd | Arts & recreation | 2025 |
| Real Apprentice (UK) Limited | Administrative & support | 2007 |
| Real Bargain PVT Ltd | Wholesale & retail | 2025 |
| Real Estate Wala Ltd | Real estate | 2025 |
| Reality Building Ltd | Construction | 2026 |
| Rebel Grove Art Limited | Arts & recreation | 2024 |
| Rebellik Ltd | Wholesale & retail | 2023 |
| Rebits Ltd | Information & communication | 2014 |
| Reborn Construction Ltd | Construction | 2020 |
| Reborn Records Limited | Extraterritorial | 2024 |
| Recession Proof Clothing Ltd | Wholesale & retail | 2026 |
| Reckitt & Colman (Overseas) Health Limited | Administrative & support | 2018 |
| Reckitt & Colman (Overseas) Hygiene Home Limited | Administrative & support | 2018 |
| Reckitt Benckiser (Brands) Limited | Professional & scientific | 2012 |
| Reckitt Benckiser (Health) Holdings Limited | Financial services | 2017 |
| Reckitt Benckiser (Hygiene Home) Holdings Limited | Financial services | 2017 |
| Reckitt Benckiser (Rumea) Limited | Professional & scientific | 2013 |
| Reckitt Benckiser Finance (2010) Limited | Financial services | 2010 |
| Reckitt Benckiser Health Limited | Professional & scientific | 2017 |
| Reckitt Benckiser Holdings (Tffc) Limited | Financial services | 2013 |
| Reckitt Benckiser Luxembourg (2010) Limited | Financial services | 2010 |
| Reckitt Seton Limited | Financial services | 1985 |
| Reckitt Sonet (UK) Limited | Financial services | 1988 |
| Recovery & Transformation Limited | Other services | 2024 |
| Recruitment Angels Ltd | Administrative & support | 2014 |
| Recruitment Grid Limited | Administrative & support | 2020 |
| Red and White Wholesale Ltd | Wholesale & retail | 2018 |
| Red Bentley Limited | Financial services | 2023 |
| Red Blue Dots Ltd | Construction | 2022 |
| Red COW Inns Limited | Real estate | 2013 |
| Red Effects Limited | Information & communication | 2015 |
| Red Lion Haulage Ltd | Transport & logistics | 2026 |
| Red Parrot Bookkeeping Limited | Professional & scientific | 2022 |
| Red Poppy Photography Limited | Professional & scientific | 2010 |
| Red Rose Carpentry&Joinery Ltd | Construction | 2020 |
| Red Rose Express Ltd | Hospitality | 2025 |
| Red Scorpions Group Ltd | Construction | 2026 |
| Red Shoes Creative Limited | Professional & scientific | 2003 |
| Red Stack Solutions Limited | Information & communication | 2019 |
| Red Strand Consulting Limited | Professional & scientific | 2024 |
| Red Zebra Analytics Ltd | Administrative & support | 2011 |
| Reda Pump Company (Singapore) Private Limited | | 1992 |
| Redcrest Holdings Ltd | Real estate | 2025 |
| Redefine IT Solutions Limited | Information & communication | 2016 |
| Redhead Holdings Limited | Administrative & support | 2025 |
| Redhead Property Company Limited | Administrative & support | 2025 |
| Redi International Limited | Transport & logistics | 2006 |
| Redkore Football Club Ltd | Arts & recreation | 2022 |
| Redland Roofing and Building Ltd | Construction | 2022 |
| Redletterweddings Ltd | Information & communication | 2024 |
| Redpath PTY Ltd | Information & communication | 2025 |
| Redseventytwo Ltd | Arts & recreation | 2017 |
| Redstar Marvida Limited | Wholesale & retail | 2023 |
| Redstone Logic Engineering Limited | Information & communication | 2016 |
| Redsun Infotech Limited | Information & communication | 2008 |
| Redwin Investments Limited | Administrative & support | 2024 |
| Redwindconsultancy Ltd | Administrative & support | 2020 |
| Redwood Software UK Ltd | Information & communication | 1998 |
| REE & Co Properties Limited | Real estate | 2025 |
| Reeanz Music Ltd | Arts & recreation | 2021 |
| Reedley Group Ltd | Real estate | 2026 |
| Reet Transport Limited | Transport & logistics | 2025 |
| Reet’S Ravishing Hair&Beauty Limited | Other services | 2021 |
| Reeves Architectural and Surveying Services Ltd | Professional & scientific | 2016 |
| Reeviren Estates Ltd | Real estate | 2024 |
| Refined Medical Ltd | Health & social care | 2026 |
| Refined Motor Co Limited | Wholesale & retail | 2025 |
| Refinedplates Ltd | Manufacturing | 2020 |
| Reflections Personnel PVT Ltd | Health & social care | 2015 |
| Reflex Solutions Limited | Information & communication | 2012 |
| Refracto-Ceramics Consultancy Limited | Professional & scientific | 2017 |
| REG DOT COM Ltd | Manufacturing | 2025 |
| REG People Limited | Wholesale & retail | 2018 |
| REG Pharmahub Limited | Professional & scientific | 2012 |
| Regal Homes (Southern) Limited | Construction | 2003 |
| Regal Residency Limited | Real estate | 2016 |
| Regal Technical & Training Solutions Limited | Information & communication | 2009 |
| Regaliz Limited | Real estate | 2016 |
| Regencycleaningandco Ltd | Administrative & support | 2026 |
| Regent Housing Limited | Health & social care | 2013 |
| Regentsphere Ltd | Construction | 2025 |
| Reggie’S Grill and Curry’S Ltd. | Hospitality | 2020 |
| Regime Media Societe Limited | Professional & scientific | 2020 |
| Regiment Contractor Limited | Construction | 2024 |
| Regional Enterprises and Sons Limited | Construction | 2021 |
| Regitie Ltd | Construction | 2025 |
| Regius Chauffeurs Ltd | Transport & logistics | 2025 |
| Regserve Consultants Ltd | Information & communication | 2011 |
| Regulatory Resourcing Ltd | Health & social care | 2018 |
| Rehab Clinical Data Ltd | Professional & scientific | 2021 |
| Rehan Enterprise Ltd | Health & social care | 2009 |
| Rehgal UK Ltd | Wholesale & retail | 2009 |
| Rehill Advisory Ltd | Professional & scientific | 2025 |
| Rehman Construction Ltd | Construction | 2024 |
| Rehman Dental Health Limited | Health & social care | 2023 |
| Rehman Dental Holdings Ltd | Health & social care | 2022 |
| Rehmat Recruitment Services Limited | Administrative & support | 2025 |
| Rehovot Accountants Ltd | Professional & scientific | 2020 |
| Reign FX Ltd | Information & communication | 2020 |
| Reign's Wendy Cafe Ltd | Hospitality | 2024 |