| Portland Pressings Limited | Manufacturing | 1976 |
| Portlands Limited | Construction | 1998 |
| Potpourri Ltd | Wholesale & retail | 2025 |
| Practical Property Services Limited | Other services | 2006 |
| Pre-Insulated Piping Limited | | 1975 |
| Pre-School Stars Limited | Education | 2003 |
| Premier Cleaning Resources Ltd | Households | 1998 |
| Premier Electric Limited | Other services | 1993 |
| Premier Isle of Wight ZOO Limited | Extraterritorial | 2000 |
| Premier Power Distribution Limited | Construction | 2019 |
| Primac Limited | Wholesale & retail | 1986 |
| Primal Diamond Healthcare Service Ltd | Health & social care | 2025 |
| Primal SFX Limited | Manufacturing | 2017 |
| Prime Shield Roofing and Building Ltd | Construction | 2026 |
| Private Label (Worldwide) Limited | Other services | 2003 |
| Profile Design Engineers Limited | | 1967 |
| Profit From Play Limited | Information & communication | 2003 |
| Projectbase Ltd | Information & communication | 2007 |
| Promise.Tv Limited | Professional & scientific | 1998 |
| Property Development & Rental Limited | Households | 2004 |
| Prospect Mews Limited | Extraterritorial | 2005 |
| Protagoras Associates Limited | Professional & scientific | 2004 |
| Protech Services (UK) Limited | Manufacturing | 2004 |
| PSH Services Limited | Information & communication | 2007 |
| Pulse Corporation Limited | Professional & scientific | 1997 |
| Purdey at the Royal Berkshire Shooting School Limited | Administrative & support | 2010 |
| Purple Turtle (Holdings) Limited | Professional & scientific | 1998 |
| Puttocks Optical Co. Limited | Extraterritorial | 1965 |
| Pyramid Enterprises Ltd | Real estate | 1999 |
| QI Consulting Limited | Professional & scientific | 2005 |
| Quadrant Communications Limited | Professional & scientific | 1991 |
| Quadriga Health & Safety Ltd. | Professional & scientific | 1996 |
| Quantum Accountancy Limited | Professional & scientific | 2005 |
| Quarkgluon Limited | Information & communication | 2005 |
| Questwest Ltd | Professional & scientific | 2006 |
| Quoin Construction Limited | Construction | 1997 |
| R & a Windows Limited | Construction | 2004 |
| R & G Smith (Southern) Limited | Construction | 1978 |
| R C Smallbone (Builders) Limited | Construction | 1992 |
| R F Hall Limited | Wholesale & retail | 2006 |
| R&C Nominees Limited | Financial services | 1998 |
| R&C Nominees One Limited | Financial services | 1999 |
| R&C Nominees Two Limited | Financial services | 1999 |
| R.E.D. Bars Limited | Hospitality | 1996 |
| R.J.D. Services Limited | Administrative & support | 1997 |
| Radarzone Limited | Extraterritorial | 2000 |
| RAI Haulage Limited | Construction | 1999 |
| Ralph Maddern Publications Ltd | | 1988 |
| Rasterhurst Limited | Real estate | 1978 |
| Rastriya Poshak Ghar UK Ltd | Wholesale & retail | 2024 |
| Rational Control Systems Limited | Other services | 2002 |
| RAW4PETS Limited | Wholesale & retail | 2017 |
| Rawsight Limited | Information & communication | 2011 |
| Rayaan of London Limited | Wholesale & retail | 2025 |
| Raycroft Limited | Extraterritorial | 1986 |
| RB Business Solutions Ltd | Information & communication | 2007 |
| RB Holdings (Nottingham) Limited | Financial services | 2002 |
| RB Reigate (UK) Limited | Financial services | 2006 |
| Rcbo Electrics Domestic & Commercial Ltd | Construction | 2026 |
| Rdse Property Management Ltd | Real estate | 2025 |
| Reactive Storage Solutions Ltd | Wholesale & retail | 2003 |
| Readibus | Transport & logistics | 1985 |
| Reading Blue Coat School | Education | 2001 |
| Reading Blue Coat School (Trading) Limited | Arts & recreation | 2001 |
| Reading Buses Limited | Transport & logistics | 1985 |
| Reading Minibuses Limited | Transport & logistics | 1985 |
| Reading Rovers Limited | Transport & logistics | 1985 |
| Reading Taxis Ltd | Transport & logistics | 2020 |
| Reading Transport Limited | Transport & logistics | 1986 |
| Reading Transport Pension Trustees Limited | Financial services | 1985 |
| Reading Welding Supplies Limited | | 1982 |
| Reading Ymca | Health & social care | 2005 |
| Real Time Information Systems Ltd | Information & communication | 1999 |
| Reckitt & Colman (Overseas) Limited | Administrative & support | 1957 |
| Reckitt & Colman (UK) Limited | Financial services | 1938 |
| Reckitt & Colman Holdings Limited | Financial services | 1998 |
| Reckitt & Colman Pension Trustee Limited | Financial services | 1998 |
| Reckitt & Sons Limited | Financial services | 1956 |
| Reckitt Benckiser (UK) Limited | Manufacturing | 2000 |
| Reckitt Benckiser (USA) Limited | Financial services | 2005 |
| Reckitt Benckiser Asia Pacific Limited | Wholesale & retail | 2004 |
| Reckitt Benckiser Corporate Services Limited | Professional & scientific | 2000 |
| Reckitt Benckiser Expatriate Services Limited | Administrative & support | 1994 |
| Reckitt Benckiser Finance (2005) Limited | Financial services | 2005 |
| Reckitt Benckiser Finance (2007) | Financial services | 2007 |
| Reckitt Benckiser Finance Company Limited | Financial services | 2003 |
| Reckitt Benckiser Group PLC | Professional & scientific | 2007 |
| Reckitt Benckiser Healthcare (Central & Eastern Europe) Limited | Professional & scientific | 1997 |
| Reckitt Benckiser Healthcare (CIS) Limited | Professional & scientific | 1997 |
| Reckitt Benckiser Healthcare (UK) Limited | Manufacturing | 1931 |
| Reckitt Benckiser Healthcare International Limited | Manufacturing | 1992 |
| Reckitt Benckiser Holdings (Luxembourg) Limited | Financial services | 2004 |
| Reckitt Benckiser Holdings (Overseas) Limited | Financial services | 2002 |
| Reckitt Benckiser Holdings (USA) Limited | Financial services | 2003 |
| Reckitt Benckiser Limited | Financial services | 1953 |
| Reckitt Benckiser Luxembourg (NO.2) Limited | Financial services | 2005 |
| Reckitt Benckiser Luxembourg (NO.3) Limited | Financial services | 2005 |
| Reckitt Benckiser Luxembourg (NO.4) Limited | Financial services | 2005 |
| Reckitt Benckiser Service Bureau Limited | Professional & scientific | 1998 |
| Reckitt Benckiser Treasury (2007) Limited | Financial services | 2007 |