| Reckitt Benckiser Treasury Services PLC | Financial services | 2006 |
| Reckitt Benckiser USA Finance (NO.1) Limited | Financial services | 2003 |
| Reckitt Benckiser USA Finance (NO.2) Limited | Financial services | 2003 |
| Reckitt Benckiser USA Finance (NO.3) Limited | Financial services | 2003 |
| Reckitt Colman Chiswick (OTC) Limited | Financial services | 1957 |
| Reckitt UK Holdings Limited | Financial services | 2024 |
| Red Robin Limited | Wholesale & retail | 1994 |
| REG Cook Limited | Construction | 2002 |
| Regency Accountants Limited | Information & communication | 2000 |
| Regency Investment Properties Limited | Real estate | 2007 |
| Regency Savings Limited | Other services | 2007 |
| Regserve Investments Ltd | Real estate | 2018 |
| Reliance Securities Limited | Real estate | 1994 |
| Renew Your House UK Ltd | Construction | 2017 |
| Reportbase Limited | Construction | 2000 |
| Resurgam Holdings Limited | Real estate | 1997 |
| Reverse Therapy Limited | Health & social care | 2004 |
| Rexon Business Machines (UK) Limited | | 1981 |
| Rhodes Pierce-All Limited | Manufacturing | 1987 |
| Ridgeback Limited | Extraterritorial | 1991 |
| Rightdream Limited | Health & social care | 2006 |
| Ripley Systems Ltd | Information & communication | 2006 |
| Rishtec Ltd | Information & communication | 2007 |
| River Carp Tours Limited | Agriculture & fishing | 2006 |
| Rivermead Accident Repair Centre Limited | Wholesale & retail | 2003 |
| Riverview Management Company (Beccles) Limited | Households | 2001 |
| RNB Plastering Limited | Construction | 2007 |
| RNP Design Solutions Ltd | Professional & scientific | 2007 |
| Ro-Bor Limited | Construction | 2005 |
| Robeert Limited | Wholesale & retail | 2025 |
| Robin Paine Limited | Transport & logistics | 2003 |
| Robo Techs Solutions Ltd | Professional & scientific | 2022 |
| Robyn PUB Co Limited | Hospitality | 2025 |
| Rochefort Healthcare (Leeds) Limited | | 1998 |
| Rockwell Preston Limited | Manufacturing | 1936 |
| Rockwell-Thompson Limited | Manufacturing | 1973 |
| Roger Fulford Associates Limited | Financial services | 2008 |
| Ronav Limited | Information & communication | 2023 |
| Rookery Taverns Limited | Hospitality | 2008 |
| Rothwell Bennett Asset Management Ltd | Extraterritorial | 2021 |
| Roundsteeple Limited | Real estate | 1985 |
| Roxton Bailey Robinson Limited | Real estate | 1993 |
| Royal Ascot Hotel Limited | Hospitality | 2002 |
| Royal County of Berkshire Shooting School Limited | Arts & recreation | 1984 |
| Rr&R Building Services Ltd | Construction | 2026 |
| Rrrem Ltd | Health & social care | 2014 |
| RSK Technical Services Limited | Information & communication | 2005 |
| Rubex Developments Ltd | Construction | 2000 |
| Rubrik Consultants Limited | Professional & scientific | 1999 |
| Running Repairs (Berkshire) Limited | Transport & logistics | 2003 |
| Russian Linguistic Services Limited | Professional & scientific | 1996 |
| Rutpen Limited | Manufacturing | 1993 |
| S Biddle Limited | Professional & scientific | 2006 |
| S Diggens Building & Roofing Limited | Construction | 2002 |
| S King Property Maintenance Limited | Construction | 2005 |
| S Lombos Ltd | Professional & scientific | 2007 |
| S.A.Winterburn & Sons Limited | Real estate | 1958 |
| S.R. Industrial Limited | Construction | 1985 |
| Safran Electrical Components UK Limited | Manufacturing | 1966 |
| Saint Properties London Ltd | Real estate | 2016 |
| Samax Estates Limited | Real estate | 1997 |
| Samco Quality Homes Limited | Real estate | 2007 |
| Sancar Consultancy Ltd | Professional & scientific | 2017 |
| Sanco Insurance Consultants Limited | Financial services | 2002 |
| Sandhurst Car Servicing Ltd | Wholesale & retail | 2012 |
| Sanjay & Amit News Agents Ltd | Wholesale & retail | 2019 |
| Savant Associates Ltd | Professional & scientific | 2005 |
| Saxham Lodge Management Company Limited | Households | 1989 |
| Saxon Industries Limited | Extraterritorial | 1983 |
| SB Property Developements Ltd | Real estate | 2022 |
| SBA Global Ltd | Transport & logistics | 2025 |
| Scarlet Engineering Services Limited | Professional & scientific | 2005 |
| Schemeasset Limited | Real estate | 1990 |
| Schofield Homes Ltd | Construction | 2014 |
| SCM Services (Berkshire) Ltd | Agriculture & fishing | 2014 |
| Scott Associates Asset Management Limited | Administrative & support | 2004 |
| Scott Racing International Sports Limited | Administrative & support | 2002 |
| SE Motor Group Limited | Wholesale & retail | 2024 |
| Sealant Applications Limited | Construction | 2003 |
| Seatofthepants.Net Ltd | Manufacturing | 2003 |
| Sebastian's Property Empire Limited | Real estate | 2017 |
| Second Rochford (Slough) Management Company Limited | Households | 1981 |
| Secure Despatch Ltd | Transport & logistics | 2001 |
| Seeds of Change Limited. | Professional & scientific | 1986 |
| Segedunum Systems Ltd. | Information & communication | 1999 |
| Self Indulgence Limited | Other services | 2011 |
| Sellix Digital Ltd | Wholesale & retail | 2026 |
| Semaca Limited | Information & communication | 2006 |
| Sensor Solutions Limited | Professional & scientific | 2005 |
| Serendipity | | 1994 |
| Serestra Limited | Manufacturing | 2025 |
| Serpent Networks Limited | Information & communication | 2006 |
| Services EP Ltd | Professional & scientific | 2012 |
| Seymour Court Management Company Limited | Households | 1985 |
| Shadmore Engineering Ltd | Information & communication | 2005 |
| Shaheen Properties Limited | Real estate | 2000 |
| Shahid Sarfraz & Co (Accountants) Limited | Professional & scientific | 2004 |
| Shariff Plumbing & Heating Ltd | Construction | 2025 |
| Sharline Limited | Real estate | 2002 |
| Sharman Associates Limited | Professional & scientific | 2002 |