| THE Oxford Wine Festival Company Ltd. | Arts & recreation | 2013 |
| THE Oxford Wine School Limited | Education | 2019 |
| THE Oxford Writing Studio Ltd | Professional & scientific | 2023 |
| THE Oxfordshire Fire Company Ltd | Wholesale & retail | 2008 |
| THE Oxfordshire Property Agent Limited | Real estate | 2023 |
| THE Parkin Clinic Ltd. | Health & social care | 2018 |
| THE Parlour at Marlborough Ltd | Wholesale & retail | 2012 |
| THE Peace View Limited | Other services | 2005 |
| THE Pennsource Partnership Limited | Professional & scientific | 2017 |
| THE Plough OX28 Ltd | Hospitality | 2025 |
| THE Plumbing & Heating Company Limited | Construction | 2015 |
| THE Poplars (Milton) Management Company Limited | Households | 2025 |
| THE Poplars Milton Ltd | Construction | 2022 |
| THE Portable Coach Ltd | Professional & scientific | 2025 |
| THE Precipio Group Ltd | Education | 2021 |
| THE Prescribing Booth Ltd | Other services | 2025 |
| THE Progression Place Ltd | Professional & scientific | 2024 |
| THE Ragamuffins Media Ltd | Wholesale & retail | 2023 |
| THE Raymond James Collection Ltd | Hospitality | 2022 |
| THE Recycler Limited | Information & communication | 1994 |
| THE Red Lion Eynsham Ltd | Hospitality | 2018 |
| THE Residential Pa's Ltd | Real estate | 2006 |
| THE Rest of Nature CIC | Professional & scientific | 2025 |
| THE Rewired Trading Company Limited | Financial services | 2017 |
| THE Ridings (Southmoor) Management Company Limited | Households | 2019 |
| THE Ridings Carterton Management Limited | Households | 2003 |
| THE Riverside (Boscastle) Ltd | Hospitality | 2015 |
| THE Roar Effect Ltd | Administrative & support | 2025 |
| THE Rose Collective Limited | Real estate | 2026 |
| THE Sales Business Limited | Information & communication | 2017 |
| THE Sandbox Workspace Ltd | Real estate | 2019 |
| THE School BUS Company (Oxford) Limited | Transport & logistics | 2018 |
| THE Shake Shop Limited | Wholesale & retail | 2013 |
| THE Shelley Collins Organisation Limited | Professional & scientific | 2014 |
| THE Shop Witney Ltd | Wholesale & retail | 2021 |
| THE Solar Shield Project Limited | Financial services | 2025 |
| THE Sphagnum Shop Ltd | Wholesale & retail | 2020 |
| THE Spice RAK Ltd | Wholesale & retail | 2026 |
| THE Stay & Roam Co Limited | Real estate | 2021 |
| THE SUP Life Ltd | Professional & scientific | 2021 |
| THE T Service Limited | Wholesale & retail | 2011 |
| THE Thirsty Goose Ltd | Hospitality | 2025 |
| THE Tutor Index Ltd | Education | 2021 |
| THE Valspar (UK) Funding Corporation Limited | Financial services | 2010 |
| THE Valspar (UK) Holding Corporation Limited | Manufacturing | 1996 |
| THE Vineyard (Abingdon) Management Company Limited | Households | 2003 |
| THE Wakeford Agency Ltd | Information & communication | 2026 |
| THE Wall House Media Company Limited | Information & communication | 2015 |
| THE Ward Spirit Ltd | Hospitality | 2024 |
| THE Water Margin J&A Limited | Hospitality | 2010 |
| THE Wedding Candle Company Ltd | Manufacturing | 2025 |
| THE Wittas Wireless Telegraphy CIC | Information & communication | 2011 |
| THE Wychwood Workshop Ltd | Manufacturing | 2026 |
| THEFAST800 Limited | Health & social care | 2021 |
| Therapy Rooms Oxford Ltd | Health & social care | 2024 |
| Thermofluidics Ltd. | Professional & scientific | 2006 |
| Thevirtualboard Limited | Professional & scientific | 2020 |
| Thew Construction Management Limited | Professional & scientific | 2015 |
| THG Vehicle Repairs Limited | Wholesale & retail | 2000 |
| Thhs Limited | Wholesale & retail | 2003 |
| Think Automotive Solutions Limited | Wholesale & retail | 2006 |
| THINKSEE3D Limited | Manufacturing | 2014 |
| Third Space Consulting Ltd | Professional & scientific | 2005 |
| Third Space Development Limited | Professional & scientific | 2010 |
| Third Voice Communications Limited | Professional & scientific | 2011 |
| Third West Ltd | Information & communication | 2007 |
| Thirtynine Cyber Ltd | Information & communication | 2024 |
| Thorne Carpentry Ltd | Construction | 2025 |
| Thoughtspark Ltd | Professional & scientific | 2020 |
| Three Kingdoms Tattoo and Piercing Ltd | Other services | 2025 |
| Three Rings CIC | Information & communication | 2009 |
| Three Shires Mobility Ltd | Manufacturing | 2022 |
| Three T.T.T. Water Sports Club Limited (the) | Arts & recreation | 1966 |
| Three-Tags Research Limited | Professional & scientific | 2025 |
| Thrive Social Business Ltd | Manufacturing | 2015 |
| Thyme West Limited | Professional & scientific | 2012 |
| TI Deposits Ltd | Education | 2013 |
| Tickets and Holidays Limited | Administrative & support | 2026 |
| Tidywow Limited | Other services | 2019 |
| Tieroem Ltd | Professional & scientific | 2021 |
| Tiger Lily Limited | Wholesale & retail | 2002 |
| Tigerwood Property Ltd | Real estate | 2019 |
| Tikli First Limited | Administrative & support | 2003 |
| Tiles 2U Ltd | Extraterritorial | 2005 |
| Tilly and Mark Limited | Hospitality | 2015 |
| TIM Robinson Wall & Floor Tiling Ltd | Construction | 2008 |
| TIM Willcox Limited | Administrative & support | 2004 |
| Timbertech Global Limited | Agriculture & fishing | 2014 |
| Timeleecleaning Ltd | Administrative & support | 2025 |
| Timepride Properties Ltd | Real estate | 2018 |
| Timlin Scientific Consulting Ltd | Professional & scientific | 2026 |
| Timms Wealth Management Ltd | Financial services | 2012 |
| Tinachi Company Ltd | Wholesale & retail | 2019 |
| TIO Climate Solutions Ltd | Manufacturing | 2020 |
| Titus Adams Plastic Surgeon Limited | Health & social care | 2012 |
| Tivra Food Ltd | Hospitality | 2026 |
| TJ Arboriculture Limited | Agriculture & fishing | 2025 |
| TJ Houses Ltd | Households | 2026 |
| TJG Property Holdings Ltd | Real estate | 2020 |
| TJS Ventures Limited | Administrative & support | 2024 |