| TIM Harper Associates Ltd | Other services | 2015 |
| TIM Perkins Consulting Ltd | Information & communication | 2023 |
| Timberforge Gates Ltd | Manufacturing | 2026 |
| Timberyte Limited | Wholesale & retail | 2009 |
| Time and Space Ltd | Hospitality | 2016 |
| Time to Drive (Training) Ltd | Transport & logistics | 2025 |
| Time Travels AYL Ltd | Transport & logistics | 2018 |
| Timed Walk Ltd | Information & communication | 2026 |
| Timeless Holdings Limited | Real estate | 2018 |
| Timeless Shine Ltd | Administrative & support | 2020 |
| Timeline Travel Ltd | Administrative & support | 2025 |
| Timescape Ltd | Information & communication | 2010 |
| Timestop Ltd | Information & communication | 2020 |
| Timon Language Services Limited | Education | 2025 |
| Timothy Maughan Consulting Limited | Professional & scientific | 2020 |
| Tineen Limited | Professional & scientific | 2023 |
| Tinker Tailor Enterprises Limited | Administrative & support | 2008 |
| Tiny Classics Oxford Limited | Information & communication | 2025 |
| Tiny Hands Childcare Ltd | Education | 2026 |
| Tiny Ideas Oxford CIC | Arts & recreation | 2023 |
| Tiny OWL Publishing Ltd | Information & communication | 2012 |
| Tipsy Badger Ltd | Hospitality | 2026 |
| Tiptop Window Cleaners LMT Limited | Administrative & support | 2025 |
| Tirana Citybreak Ltd | Administrative & support | 2024 |
| Tirana Trim Ltd | Other services | 2023 |
| Tirrold Investments Limited | Hospitality | 2020 |
| Titus Estates Limited | Construction | 2014 |
| Titus Group Limited | Real estate | 2014 |
| TJ Naturals Jerk HUT OX Limited | Hospitality | 2025 |
| Tj-W Real Limited | Real estate | 2021 |
| TJC Global Limited | Professional & scientific | 2003 |
| TK Bakes Ltd | Wholesale & retail | 2025 |
| Tkdynamics Consultant Limited | Information & communication | 2015 |
| TLC Removals Ltd | Transport & logistics | 2025 |
| TLS Food and Wine Limited | Wholesale & retail | 2025 |
| TM Dobson Holdings Limited | Financial services | 2022 |
| TMD Music Ltd | Arts & recreation | 2016 |
| Tmedical Limited | Real estate | 2025 |
| TN Solution Consultancy Ltd | Education | 2016 |
| TNG Technology Consulting UK Ltd | Information & communication | 2023 |
| TNK Reporting Limited | Health & social care | 2026 |
| TNO Global Ltd | Professional & scientific | 2022 |
| TNP Ltd | Health & social care | 2018 |
| TNT Convenience Ltd | Wholesale & retail | 2025 |
| Toast TV Limited | Information & communication | 2002 |
| Tobani Limited | Health & social care | 2019 |
| Tobias Davidson Ltd | Professional & scientific | 2014 |
| Tobias Halloran Limited | Information & communication | 2022 |
| Tobiwunmi Limited | Health & social care | 2019 |
| Tobo Security Limited | Administrative & support | 2026 |
| Toci.D Construction Ltd | Construction | 2022 |
| Todeschini Holdings Ltd | Financial services | 2025 |
| Todio Limited | Administrative & support | 2021 |
| Tods Workshops Limited | Manufacturing | 2010 |
| TOF Corporate Trustee Limited | Financial services | 2018 |
| Together 4 Change Limited | Other services | 2012 |
| Toiber Kent Limited | Financial services | 2016 |
| Toiber Kent Properties Ltd | Real estate | 2021 |
| Tokboost Ltd | Information & communication | 2025 |
| Tokumine Holdings Ltd | Professional & scientific | 2021 |
| Tollymore Limited | Information & communication | 2016 |
| TOM DE Freston Limited | Arts & recreation | 2018 |
| TOM Howdill Construction Consultancy Limited | Professional & scientific | 2019 |
| Tomat Healthylife Limited | Manufacturing | 2026 |
| Tommy-Bee UK Limited | Health & social care | 2015 |
| Tommytrinder.Com Limited | Information & communication | 2014 |
| Tompkins Developments Limited | Construction | 2017 |
| Tony Price Decorating Consultants Ltd | Construction | 2026 |
| TOO Futures Limited | Professional & scientific | 2018 |
| Toolmart Ltd | Wholesale & retail | 2025 |
| Toots Taxis Ltd | Transport & logistics | 2020 |
| Top Management Solutions Ltd | Professional & scientific | 2021 |
| Top Marble Ltd | Wholesale & retail | 2005 |
| Top Movers Ltd | Transport & logistics | 2026 |
| Top Quality Decorator Limited | Construction | 2013 |
| Topcat Consultancy Limited | Professional & scientific | 2015 |
| Topos Research UK | Professional & scientific | 2024 |
| Topout Aero Limited | Professional & scientific | 2014 |
| Topres Ltd | Construction | 2022 |
| Topstone Enterprises Limited | Real estate | 2023 |
| Topsyjoe Limited | Health & social care | 2017 |
| Torch Theatre Productions Oxford CIC | Arts & recreation | 2023 |
| Toro ORO Performance Engineering Ltd | Professional & scientific | 2016 |
| Torshear Investments Ltd | Real estate | 2020 |
| Tortoise Studio Ltd | Hospitality | 2022 |
| Torus Angle Limited | Real estate | 2021 |
| Tota Kitchen Ltd | Hospitality | 2023 |
| Total Renovations and Maintenance Ltd | Construction | 2024 |
| Totem Cultures Ltd | Administrative & support | 2017 |
| Touchstone Clothing Ltd | Wholesale & retail | 2024 |
| Touchstone Industrial Automation Limited | Professional & scientific | 2022 |
| Tourism Economics Limited | Information & communication | 2005 |
| Tower Deep Enterprise Limited | Health & social care | 2024 |
| Tower House Residents Co. Limited | Households | 2003 |
| Towle Spurring Hardy Ltd | Professional & scientific | 2004 |
| Town Farm Construction Limited | Construction | 1999 |
| Toys of Wood Oxford Ltd | Wholesale & retail | 2013 |
| TPS Coaching Limited | Education | 2004 |
| Tracer Labs UK Limited | Information & communication | 2021 |
| Track Surveys Limited | Information & communication | 2000 |