| Publican Pubs Limited | Financial services | 2022 |
| Puddle END Farm Ltd | Agriculture & fishing | 2011 |
| Pulsar Business Services Ltd | Professional & scientific | 2008 |
| Pulse Support Services Ltd | Real estate | 2025 |
| Pure Being Ltd | Professional & scientific | 2021 |
| Pure HR Limited | Extraterritorial | 2018 |
| Pure Identity Limited | Professional & scientific | 2016 |
| Pure Production London Ltd | Other services | 2019 |
| Purely Air Tech EOT Limited | Administrative & support | 2025 |
| Purple Advisory Care Ltd | Education | 2025 |
| Purtington Investments Limited | Financial services | 2017 |
| PWR Refrigeration and Air Conditioning Ltd | Energy | 2024 |
| Pyar Diamonds Ltd | Wholesale & retail | 2025 |
| Pyvot Limited | Administrative & support | 2016 |
| Q & Q Construction Carpentry Ltd | Construction | 2024 |
| Q LAB Ltd | Health & social care | 2019 |
| QC Oxford Limited | Households | 2011 |
| QGP Heritage Developments LLP | | 2023 |
| Quad Construction and Maintenance Limited | Construction | 2022 |
| Quad Design Studio Ltd | Professional & scientific | 2024 |
| Quad Joinery Limited | Manufacturing | 2025 |
| Quant AI Tech Ltd | Information & communication | 2025 |
| Quantum Sensors Limited | Professional & scientific | 2023 |
| Quartermain Construction Ltd | Construction | 2010 |
| Quartz & Stone Limited | Wholesale & retail | 2015 |
| Quartz Productions Limited | Information & communication | 2006 |
| Quattro Publishing Limited | Information & communication | 2025 |
| Queen Anne Mews (Abingdon) Management Company Limited | Households | 2002 |
| Queen of Brands Ltd | Professional & scientific | 2019 |
| Queensgate Heritage Schoolhouse Limited | Construction | 2023 |
| Quercus Management Limited | Professional & scientific | 1996 |
| Questris Limited | Extraterritorial | 2005 |
| Quick Motor Solutions Ltd | Wholesale & retail | 2020 |
| Quick Red FOX Ltd | Professional & scientific | 2012 |
| Quickcharge Holdings Ltd | Construction | 2020 |
| Quince Group Limited | Professional & scientific | 2021 |
| Quininvest Limited | Financial services | 2019 |
| Quintessential Space Limited | Professional & scientific | 2021 |
| R & C Brickwork Limited | Construction | 2017 |
| R & E Property Development Limited | Construction | 2026 |
| R & J Solutions Ltd | Professional & scientific | 2021 |
| R & R Associates Ltd | Professional & scientific | 2011 |
| R & S Autos (Manchester) Ltd | Wholesale & retail | 2013 |
| R a Crocker Ltd | Administrative & support | 2006 |
| R B Siesta Limited | Financial services | 2019 |
| R J B Electrical Services Limited | Construction | 2007 |
| R Leumas Investment Company Limited | Real estate | 2021 |
| R P Knight Building Ltd | Construction | 2012 |
| R S Interior Plastering Ltd | Construction | 2020 |
| R&L Capital Ltd | Real estate | 2021 |
| R&L Longbow Holdings Limited | Financial services | 2025 |
| R&R Design & Build Ltd | Real estate | 2019 |
| R&R Electrical Services (Oxford) Ltd | Construction | 2023 |
| R. Dunham Electrical Limited | Construction | 2014 |
| R. J. Adams Limited | Administrative & support | 1996 |
| R.A.Jones (Witney) Limited | Administrative & support | 1944 |
| R.F.C. Haulage Ltd | Transport & logistics | 2022 |
| R.L. Clapton Limited | Construction | 1974 |
| R.Mead Phase 2 (Swindon) Management Company Limited | Households | 2006 |
| RA Financial Services Ltd | Financial services | 2019 |
| Raani Ltd | Wholesale & retail | 2023 |
| Rabco Care Limited | Health & social care | 2020 |
| Rabco Enterprises Limited | Real estate | 2018 |
| Race Vehicle Transport International Limited | Transport & logistics | 2024 |
| Racing Edge Limited | Wholesale & retail | 2002 |
| Racing Lives Ltd | Professional & scientific | 2022 |
| RAD Capsule Market Ltd | Wholesale & retail | 2026 |
| Radiant Consultancy Services Ltd | Professional & scientific | 2022 |
| Radnb Ltd | Information & communication | 2020 |
| Raiden Limited | Information & communication | 2015 |
| Rainbow House Takeaway Ltd | Hospitality | 2024 |
| Rainbow Property Services Ltd | Real estate | 2017 |
| Rainbow Trees Pathway Limited | Education | 2026 |
| Raise Consulting Services Limited | Professional & scientific | 2017 |
| Rajes Retail Holding Ltd | Real estate | 2024 |
| Rajes Retail Ltd | Wholesale & retail | 2026 |
| Rajes Trade Ltd | Wholesale & retail | 2018 |
| Rally Preparation Services Ltd | Wholesale & retail | 2009 |
| Ralt Engineering Limited | Manufacturing | 1994 |
| Rana Property Group Ltd | Real estate | 2021 |
| Rand Contracting (UK) Ltd | Agriculture & fishing | 2014 |
| Randolph House Owners Management (Oxford) Limited | Households | 2000 |
| Raon Group Limited | Real estate | 2025 |
| Rapid Medicals London Ltd | Wholesale & retail | 2024 |
| Raptor Technology Consulting Limited | Information & communication | 2021 |
| Raroc Ltd | Professional & scientific | 2024 |
| Rawlinson Investments Ltd | Real estate | 2021 |
| RAY Hessey Limited | Construction | 2001 |
| Raymond Hall Limited | Construction | 2006 |
| Raymondo Ominira Holdings Limited | Construction | 2020 |
| RCH Hospitality Limited | Professional & scientific | 2024 |
| Ready Deck Access Systems Limited | Extraterritorial | 2019 |
| Real Architectural Designs Carpentry Limited | Manufacturing | 2020 |
| Real Architectural Designs Limited | Professional & scientific | 2018 |
| Realmsway Limited | Real estate | 2020 |
| Reay Projects Ltd | Real estate | 2023 |
| Rebecca Taylor Associates Limited | Manufacturing | 2001 |
| Recare Limited | Wholesale & retail | 2011 |
| Rectory Lane Management Limited | Households | 1984 |
| Recycler Publishing & Events Limited | Information & communication | 2006 |