| Tech Leader Secrets Ltd | Professional & scientific | 1997 |
| Teddy Bears of Witney Limited | Wholesale & retail | 1999 |
| Teknipart Limited | Wholesale & retail | 1965 |
| Tekno Solutions Limited | Information & communication | 2003 |
| Tempest Contracting Limited | Information & communication | 1995 |
| Templeton Charterhouse (Oxford) Limited | Administrative & support | 2004 |
| Templeton Charterhouse Limited | Financial services | 2004 |
| Textures Flooring Limited | Construction | 2006 |
| Thame Dental Care Ltd | Health & social care | 2010 |
| Thame Freight Services Ltd. | Transport & logistics | 2001 |
| Thame Therapy Clinic Limited | Health & social care | 2007 |
| Thames Tutorials Ltd | Education | 2000 |
| Thames View (Holdings) Limited | Real estate | 1949 |
| THE Ampersand Agency Ltd | Administrative & support | 2007 |
| THE Bitter and Twisted PUB Company Limited | Hospitality | 2007 |
| THE Bookstore (Abingdon) Limited | Wholesale & retail | 2004 |
| THE Brand Development Business Limited | Administrative & support | 1991 |
| THE Brown Experience Limited | Other services | 2002 |
| THE C.S. Lewis Foundation (UK) | Education | 1996 |
| THE Chipping Norton Flower Farm Limited | Wholesale & retail | 2020 |
| THE Closes Management Company Limited | Professional & scientific | 1997 |
| THE Clutter Clearing Consultancy Limited | Professional & scientific | 2005 |
| THE Competent Management Company Limited | Professional & scientific | 1993 |
| THE Dirac Foundation | Professional & scientific | 1994 |
| THE Ferrater Mora Oxford Centre for Animal Ethics Limited | Education | 2005 |
| THE Field Unit Limited | Extraterritorial | 2007 |
| THE Four Counties (Industrial Cleaners) Limited | Professional & scientific | 1999 |
| THE Jericho Cafe Ltd | Hospitality | 2002 |
| THE Julie Richardson Ltd. | Health & social care | 2003 |
| THE Keane Sisters Limited | Administrative & support | 2007 |
| THE Little Consulting Company Limited | Professional & scientific | 2013 |
| THE London Foot and Ankle Clinic Limited | Health & social care | 2014 |
| THE Make-Up Brush Company Limited | Arts & recreation | 2005 |
| THE Ninth BIT Ltd | Administrative & support | 2017 |
| THE Old Courtyard (Chipping Norton) Management Company Limited | Administrative & support | 1998 |
| THE Oxford Property Letting Company Limited | Real estate | 2004 |
| THE Pear Ring Limited | Manufacturing | 2022 |
| THE People Development People Ltd | Professional & scientific | 2018 |
| THE Permitting Company Limited | Professional & scientific | 2025 |
| THE Right Exchange Ltd | Information & communication | 2015 |
| THE Springs Management Company Limited | Real estate | 2005 |
| THE Sugar Art House Ltd. | Arts & recreation | 2013 |
| THE Three Horseshoes (Henley) Ltd | Hospitality | 2003 |
| THE Unlock Partnership Limited | Professional & scientific | 2022 |
| THE Witney Reseller Limited | Wholesale & retail | 2026 |
| THE Wychwood Golf Club Limited | Arts & recreation | 1991 |
| Theatre Investment Limited | Arts & recreation | 2014 |
| Thind Brothers Superstore Ltd | Wholesale & retail | 2023 |
| Think Noodle Limited | Information & communication | 2005 |
| Third Millennium Holdings Limited | Professional & scientific | 1998 |
| Thomas Design Regeneration & Consultation Limited | Professional & scientific | 2004 |
| Thor Research Limited | Professional & scientific | 2006 |
| Three Hills Holdings Ltd | Financial services | 2023 |
| TIM Payne Overdrive Designs Limited | Manufacturing | 1994 |
| Timpeers Estate Agents Limited | Real estate | 2002 |
| TMG Controls Limited | Arts & recreation | 2003 |
| Tollington Court Management Company Limited | Households | 1993 |
| Tolomey Limited | Manufacturing | 1999 |
| TOM Harwood & Sons (Builders) Limited | Construction | 1987 |
| TOM Savage Roofing & Building Ltd | Construction | 2018 |
| Toptel Limited | Professional & scientific | 1986 |
| Tosca & Willoughby Limited | Manufacturing | 1979 |
| Total Surfacing Solutions Limited | Construction | 2013 |
| Tottie Wear Ltd. | Manufacturing | 2002 |
| Touch Screen Developers Limited | Information & communication | 2007 |
| Trackland Property Management Limited | Households | 1982 |
| Trade Solutions Oxford Ltd | Wholesale & retail | 2007 |
| Trail Bear Ltd | Agriculture & fishing | 2025 |
| Trainetics Ltd | Professional & scientific | 2019 |
| Transun Retail Limited | Administrative & support | 2006 |
| Transun Travel Limited | Administrative & support | 1982 |
| Treasures of Tenbury Limited | Wholesale & retail | 1961 |
| Treetops.Com Limited | Agriculture & fishing | 2001 |
| Trewhella Sisters Limited | Extraterritorial | 2003 |
| Triangle Database Marketing Ltd | Professional & scientific | 1998 |
| Trojan Resources Limited | Professional & scientific | 1996 |
| Tropical Power Limited | Professional & scientific | 2002 |
| Trumedia Limited | Administrative & support | 1987 |
| Trustek Group Ltd | Information & communication | 2020 |
| Trustek Software Limited | Manufacturing | 2016 |
| TRY Again Ltd | Other services | 2024 |
| Trysports Limited | Wholesale & retail | 1996 |
| Tudor Aerospace Ltd | Manufacturing | 2025 |
| Tudorspan Limited | Information & communication | 1991 |
| Turbon International Limited | Professional & scientific | 1992 |
| Twilite Leisure Limited | Arts & recreation | 2004 |
| Ubuntu Science Ltd | Professional & scientific | 2023 |
| Uklg Limited | Wholesale & retail | 2018 |
| Ultimate Image Photography Limited | Professional & scientific | 2004 |
| Unicorn Valley Farm Limited | Agriculture & fishing | 2024 |
| Uppergate Services Limited | Information & communication | 2003 |
| Usue Limited | Professional & scientific | 2007 |
| Vecon Engineering Limited | Professional & scientific | 2002 |
| Vela Infrastructure (UK) Ltd. | Information & communication | 2025 |
| Vela Infrastructure Emea Holdings Ltd | Information & communication | 2025 |
| Venture Logic Limited | Professional & scientific | 2001 |
| Veracity (Oxford) Limited | Professional & scientific | 2004 |
| Veritrec Recruitment Solutions Limited | Information & communication | 2014 |
| Veronalder Holdings Limited | Professional & scientific | 1989 |
| Vibration Free Ltd. | Professional & scientific | 2001 |