| Prsj Services Limited | Other services | 2025 |
| PTS Campers and Caravan Repairs Ltd | Manufacturing | 2021 |
| Punched Monkey Limited | Hospitality | 2019 |
| Puratak Limited | Wholesale & retail | 2021 |
| Purely Plants Limited | Wholesale & retail | 2016 |
| Purple Stone Life Ltd | Professional & scientific | 2020 |
| Q.Arb Limited | Agriculture & fishing | 2026 |
| QED Sameday Courier Ltd | Transport & logistics | 2003 |
| Qpsmr Limited | Professional & scientific | 2000 |
| Quality English Limited | Education | 2003 |
| Qubiq Online Limited | Professional & scientific | 2005 |
| Queenford Farm Ltd | Agriculture & fishing | 1996 |
| R C M Solutions Limited | Construction | 2010 |
| R Towers Consultancy Limited | Information & communication | 2011 |
| R Whiteman Property Services Limited | Administrative & support | 2025 |
| R.G. Park Family Butchers Limited | Wholesale & retail | 2006 |
| R2 Property Developments Ltd | Real estate | 2021 |
| Raceparts (U.K.) Limited | Wholesale & retail | 1977 |
| Raceparts Grosvenor Limited | Financial services | 2009 |
| Raceparts Limited | Financial services | 1991 |
| Rachael Redstone Dental Therapy Ltd | Health & social care | 2024 |
| RAD Software Ltd | Information & communication | 2026 |
| RAF Benson Flying Club Limited | Arts & recreation | 1998 |
| Rainford Traders Ltd | Wholesale & retail | 2024 |
| RAM Quarter Investments Limited | Real estate | 2021 |
| Ramburuth Associates Ltd | Other services | 2019 |
| Rathbone Music Limited | Other services | 2025 |
| RB Installations (UK) Limited | Administrative & support | 2013 |
| Rbro Solutions-Uk Limited | Information & communication | 2013 |
| RBS Plumbing and Heating Ltd | Construction | 2018 |
| RBT Spice Limited | Hospitality | 2022 |
| RBW Carpentry & Construction Ltd | Construction | 2020 |
| RCB Training and Assessment Ltd | Professional & scientific | 2026 |
| RD Connect Ltd | Professional & scientific | 2000 |
| Reading Endocrinology, Diabetes and Lipids Ltd | Health & social care | 2025 |
| Realistic Games Limited | Information & communication | 2002 |
| Really Good Ideas Limited | Professional & scientific | 2011 |
| Rebecca Smalley Ltd | Agriculture & fishing | 2024 |
| Red Gull Limited | Wholesale & retail | 2021 |
| Red Kite (Oxford) Ltd | Real estate | 2019 |
| Red Kite Technology Limited | Information & communication | 2006 |
| Red Kite Wealth Management Limited | Financial services | 2017 |
| Red Lion Brewery Ltd | Manufacturing | 2023 |
| Red Lion Cholsey Limited | Hospitality | 2026 |
| Red Lion Culworth Ltd | Hospitality | 2025 |
| Red Style Limited | Other services | 2022 |
| Redline Media Ltd | Professional & scientific | 2022 |
| Redman Controls & Electronics Limited | Manufacturing | 1973 |
| Redman Electrical Limited | Energy | 2017 |
| Redman Property Limited | Real estate | 2007 |
| Refined Running Ltd | Arts & recreation | 2022 |
| Refinia Ltd | Financial services | 2025 |
| Regolite Limited | Water & waste | 2024 |
| Rejuvelase Ltd | Other services | 2025 |
| Renovatio Property Ltd | Real estate | 2025 |
| Research Worldwide Limited | Professional & scientific | 2002 |
| Rethink Management Group Limited | Professional & scientific | 2018 |
| Revelo Limited | Wholesale & retail | 2002 |
| RGE (Regenearth) Ltd | Professional & scientific | 2025 |
| Ridgeway Campers Ltd | Wholesale & retail | 2026 |
| Ridgeway Living Ltd | Real estate | 2024 |
| Ridgeway Property Services Ltd | Real estate | 2025 |
| Rights Care Ltd | Health & social care | 2020 |
| Ringsell Group Limited | Information & communication | 2021 |
| Rising Levels Limited | Information & communication | 2018 |
| RJ Dynamic Interiors Ltd | Construction | 2017 |
| RKD Ponies Ltd | Agriculture & fishing | 2021 |
| RLC GAS Ltd | Construction | 2024 |
| Road Transport Compliance Ltd | Transport & logistics | 2023 |
| Robert Gomm Plumbing Limited | Construction | 2025 |
| Rogan Sport Ltd | Professional & scientific | 2020 |
| Rohan Iswariah Limited | Other services | 2003 |
| Role Filled Ltd | Professional & scientific | 2024 |
| Rolling Fields Glamping Ltd | Hospitality | 2021 |
| Romark Homes Limited | Real estate | 2015 |
| Root One Limited | Wholesale & retail | 2001 |
| Rory Andrews Landscape Design Ltd | Administrative & support | 2022 |
| Rose Buds (Penzance) Limited | Other services | 2017 |
| Rose Villa Farm Limited | Other services | 2024 |
| Round & About Publications Limited | Information & communication | 1999 |
| Rowlyvette Health & Care Ltd | Public administration | 2019 |
| Rowse Properties Limited | Real estate | 1973 |
| ROY Windebank Auto Engineers Ltd | Wholesale & retail | 2022 |
| Rpsj Services Limited | Other services | 2022 |
| Ruby Property Ltd | Real estate | 2015 |
| Rugbytots Northampton Ltd | Education | 2023 |
| Runwize Sports Ltd | Wholesale & retail | 2021 |
| Russell Street House Limited | Households | 2006 |
| Rust Group L.P. | | 2007 |
| Rust Properties Limited | Real estate | 2009 |
| Rust Ventures Limited | Other services | 2007 |
| Rustic Yeti Limited | Information & communication | 2012 |
| Ruth Evans Productions Limited | Information & communication | 2002 |
| Ruth Top Host Ltd | Hospitality | 2024 |
| S J Farrant & SON (Land Developments) Ltd | Construction | 2020 |
| S J Powis Ltd | Construction | 2014 |
| S R L Flooring Limited | Manufacturing | 2025 |
| S Wilkins Developments Ltd | Construction | 2021 |
| S&K Selling Ltd. | Wholesale & retail | 2022 |
| S. Grundon (Services) Limited | Professional & scientific | 1964 |