| Telegraph Materials Ltd | Professional & scientific | 2023 |
| Telic Research Ltd | Professional & scientific | 2024 |
| Templars Hall Residents Association Limited | Households | 2004 |
| Temple Cloisters (Oxford) Limited | Households | 1997 |
| Temple Court Residents Association Limited | Households | 1987 |
| Temple CUT Ltd | Other services | 2025 |
| Temple Gate Management Company Limited | Households | 2022 |
| Temple Road Garage Limited | Wholesale & retail | 2024 |
| Temple Sound Limited | Information & communication | 2020 |
| Temple Sound Records Ltd | Wholesale & retail | 2025 |
| Temple Street Dental Ltd | Health & social care | 2022 |
| Temptations Dessert Lounge Ltd | Hospitality | 2019 |
| TEN by 10 Co Ltd | Other services | 2025 |
| TEN X Leisure Limited | Hospitality | 2021 |
| TEN X Property Portfolio Limited | Hospitality | 2021 |
| Tennyson Lodge Freehold Limited | Households | 2016 |
| TEO Property Services Ltd | Construction | 2025 |
| Teravox Ltd | Information & communication | 2025 |
| Terminus Foundry Limited | Professional & scientific | 2025 |
| Terra Plumbing & Heating Limited | Construction | 2016 |
| Terracend Ltd | Construction | 2025 |
| Terrachange Solar Limited | Professional & scientific | 2023 |
| Terrahub Ltd | Real estate | 2026 |
| Terry's Ice Cream (Oxford) Limited | Other services | 1985 |
| Terry's-Stone Cottage Limited | Wholesale & retail | 2001 |
| Terumo Global Treasury Services Ltd | Administrative & support | 2026 |
| Tess Mcpherson Dermatologist Limited | Health & social care | 2021 |
| TESSELL8 Limited | Manufacturing | 2013 |
| Test Magus Limited | Professional & scientific | 2013 |
| TFP Fertility Clinics Limited | Financial services | 2023 |
| TFP Fertility Group Limited | Financial services | 2019 |
| TGA Comms Ltd | Professional & scientific | 2013 |
| TGM Bathrooms Ltd | Construction | 2021 |
| TH / Edition Ltd | Manufacturing | 2014 |
| Thackeray Close (Cumnor Hill) Management Company Limited | Households | 2020 |
| Thadious Appiah Limited | Health & social care | 2015 |
| Thai Fight Holding UK Limited | Arts & recreation | 2023 |
| Thai Kitchen POP UP Ltd | Hospitality | 2025 |
| Thalan Limited | Professional & scientific | 2019 |
| Thalor Capital LLP | | 2025 |
| Thames Valley Communications Limited | Professional & scientific | 2016 |
| Thames Valley Fertility Limited | Health & social care | 2016 |
| Thames Valley Plumbers Limited | Construction | 2009 |
| Thames Valley Scar Clinic Limited | Health & social care | 2023 |
| Thames Valley Servicing Limited | Construction | 2024 |
| Thames Valley Surgery Ltd | Health & social care | 2025 |
| Thameselectrics Ltd | Construction | 2024 |
| Thasilo Ltd | Real estate | 2025 |
| That Coffee Ltd | Hospitality | 2019 |
| That Event Company Ltd | Information & communication | 2016 |
| Thatcham Estates Ltd | Real estate | 2024 |
| Thatchcastle Limited | Professional & scientific | 1984 |
| THE Actors Temple Limited | Education | 2003 |
| THE Adhd and Autism Clinic Limited | Health & social care | 2022 |
| THE Admissions Academy Limited | Education | 2025 |
| THE Afghans Diaspora Jirga CIC | Health & social care | 2026 |
| THE Albion Edit Limited | Information & communication | 2026 |
| THE Archway Foundation | Health & social care | 1988 |
| THE Arthurs Decor Ltd | Hospitality | 2024 |
| THE Artisans’ Street Food Company Ltd | Hospitality | 2020 |
| THE Aunties Limited | Education | 2003 |
| THE Aunties Training Centre Ltd | Education | 2020 |
| THE Avebury Group Ltd | Administrative & support | 2020 |
| THE Avenue (Kennington) Residents Company Limited | Households | 1996 |
| THE Bald Barber Oxford Ltd | Real estate | 2021 |
| THE Barbell Yard Ltd | Arts & recreation | 2021 |
| THE Barber House Oxford Ltd | Other services | 2025 |
| THE BD Team LLP | | 2012 |
| THE Beechcroft Foundation Limited | Professional & scientific | 2002 |
| THE Behavioural Change Company Ltd | Professional & scientific | 2011 |
| THE Bespoke Midwife Ltd. | Education | 2024 |
| THE Bespoke Roofing Guys Ltd | Construction | 2026 |
| THE Better Letter Limited | Other services | 2011 |
| THE Black BOY Oxford Limited | Hospitality | 2019 |
| THE Blue and White Company (UK) Ltd | Wholesale & retail | 2017 |
| THE Board Cafe Ltd | Information & communication | 2012 |
| THE Boathouse Dental Surgery Limited | Health & social care | 2014 |
| THE Body Therapy Shop Limited | Other services | 2019 |
| THE Bone Season Limited | Information & communication | 2019 |
| THE Borthwick Group Limited | Administrative & support | 2016 |
| THE Brackley Clinic Ltd | Health & social care | 2012 |
| THE Brazier Holt Partnership Limited | Professional & scientific | 2002 |
| THE Brit American Ltd | Wholesale & retail | 2026 |
| THE Brit Gifts Limited | Wholesale & retail | 2022 |
| THE British-Slovene Society | Education | 1993 |
| THE Business of Education Ltd | Administrative & support | 2026 |
| THE Cafe at Hogacre Common Community Interest Company | Hospitality | 2019 |
| THE Camera Chaps Limited | Information & communication | 2013 |
| THE Cardiology Greeting Cards UK Ltd | Wholesale & retail | 2025 |
| THE Career Innovation Company Limited | Information & communication | 1996 |
| THE Castle Oxford Limited | Hospitality | 2017 |
| THE Centre for Emotional Health | Education | 1997 |
| THE Centre for Enterprise, Markets and Ethics | Education | 2012 |
| THE Centre for Sustainable Healthcare Ltd | Health & social care | 2010 |
| THE Chequers OX25 Ltd | Hospitality | 2025 |
| THE Chilterns Haddenham Management Company Limited | Households | 2017 |
| THE City of Oxford Charity Limited | Real estate | 2017 |
| THE Cloisters (Oxford) Management Company Limited | Households | 1999 |
| THE Cloud Shisha Lounge Ltd | Hospitality | 2024 |
| THE Clouds Oxford Ltd | Hospitality | 2024 |