| Tashoo Kebab Limited | Hospitality | 2026 |
| Tasty Foodies Corner Ltd | Hospitality | 2023 |
| Taxi Hire Co. Ltd | Transport & logistics | 1999 |
| TDR Service Solutions Ltd | Transport & logistics | 2025 |
| TEAM4LEARNING Ltd | Administrative & support | 2026 |
| Teapressocardiff Ltd | Hospitality | 2026 |
| Tech Cloudify Ltd | Information & communication | 2026 |
| Tech Resurgence Solutions Limited | Manufacturing | 2023 |
| Techno-Bro Limited | Information & communication | 2023 |
| Tempo Football Ltd | Arts & recreation | 2026 |
| Tengate Limited | Real estate | 2016 |
| Teratech Components Limited | Manufacturing | 2010 |
| Terra Motus Limited | Professional & scientific | 2019 |
| TFK Project Solutions Ltd | Professional & scientific | 2025 |
| TGP Plumbing and Heating Ltd | Construction | 2023 |
| Thames Brickwork Ltd | Construction | 2023 |
| Thames Cryogenics Limited | Manufacturing | 2003 |
| Thames Fire and Security Systems Ltd | Administrative & support | 2025 |
| Thames Fixings and Fasteners Limited | Wholesale & retail | 1974 |
| Thames Valley Petroleum Ltd | Professional & scientific | 2019 |
| Thames Valley Temperature Control (Maintenance) Limited | Energy | 1998 |
| Thayer Consultancy Services Ltd | Information & communication | 2016 |
| THE Abingdon Marathon Limited | Arts & recreation | 2026 |
| THE AD Plain Holdings Limited | Professional & scientific | 2018 |
| THE Animal Innovation Hub Ltd | Agriculture & fishing | 2026 |
| THE Art of Wonder UK Ltd | Professional & scientific | 2026 |
| THE Barn (Didcot) Limited | Hospitality | 1966 |
| THE Basterfield's Estate Ltd | Real estate | 2024 |
| THE Beekeeping Show Limited | Other services | 2022 |
| THE Book of ME Ltd | Professional & scientific | 2025 |
| THE Brand New Studio Ltd | Professional & scientific | 2013 |
| THE Bridal Paperie Limited | Professional & scientific | 2020 |
| THE Caring Company (Oxon) Ltd | Health & social care | 2008 |
| THE Clubhouse Edit Ltd | Professional & scientific | 2026 |
| THE Colosseum Boxing Club C.I.C. | Arts & recreation | 2026 |
| THE Construction Company Oxfordshire Ltd | Construction | 2024 |
| THE Crafters Emporium CIC | Wholesale & retail | 2019 |
| THE Critters DEN Ltd | Wholesale & retail | 2025 |
| THE Diamond Growing Company Ltd | Professional & scientific | 2024 |
| THE Eagle Reserve Ltd | Real estate | 2025 |
| THE Electrospinning Company Limited | Professional & scientific | 2008 |
| THE Entrepreneurs Mentor Ltd | Administrative & support | 2010 |
| THE Exercise Lounge Didcot Ltd | Arts & recreation | 2024 |
| THE Faraday Institution | Professional & scientific | 2017 |
| THE FAT Frog Ltd | Hospitality | 2018 |
| THE Figaro Shop Holdings Limited | Financial services | 2019 |
| THE Figaro Shop Limited | Wholesale & retail | 2010 |
| THE Garage Experts (Oxfordshire) Ltd | Wholesale & retail | 2025 |
| THE GPT Innovator Ltd | Information & communication | 2023 |
| THE Hart, Harwell Limited | Hospitality | 2024 |
| THE Harwell Quad One Limited | Construction | 2016 |
| THE Harwell Science and Innovation Campus General Partner Limited | Real estate | 2007 |
| THE Harwell Science and Innovation Campus Limited Partnership | | 2008 |
| THE Harwell Science and Innovation Campus NO.4 Nominee Limited | Construction | 2023 |
| THE Harwell Science and Innovation Campus Nominee Limited | Financial services | 2008 |
| THE Harwell Science and Innovation Campus Nominee NO.2 Limited | Construction | 2017 |
| THE Harwell Science and Innovation Campus Nominee NO.3 Limited | Construction | 2023 |
| THE Inner Hearth Ltd | Manufacturing | 2025 |
| THE Jays Care Ltd | Education | 2026 |
| THE Leadership Strategist Limited | Professional & scientific | 2017 |
| THE Limes 29-31 Newlands Park RTM Company Limited | Real estate | 2015 |
| THE London Letting Agency Limited | Real estate | 2002 |
| THE Master Energist Limited | Health & social care | 2022 |
| THE Mission Mexican Grill Ltd | Hospitality | 2008 |
| THE Mulberry PUB Ltd | Hospitality | 2021 |
| THE Orbit Business Community Ltd | Other services | 2025 |
| THE Oxford Smile Clinics (Didcot) Limited | Health & social care | 2016 |
| THE Oxford Smile Clinics (Oxford) Limited | Health & social care | 2011 |
| THE Removal Company Oxfordshire Ltd | Transport & logistics | 2026 |
| THE Richardson Farms Partnership LP | | 2009 |
| THE Rosalind Franklin Institute | Professional & scientific | 2018 |
| THE Shire Roofing Company (Oxford) Ltd | Construction | 2019 |
| THE Silicone Centre Ltd | Manufacturing | 2016 |
| THE Southern Counties Baptist Association | Other services | 2001 |
| THE Transport OX Ltd | Transport & logistics | 2024 |
| THE Tyrebarn Ltd | Wholesale & retail | 2009 |
| THE Workers Club Holdings Limited | Financial services | 2024 |
| THE Workers Club Limited | Manufacturing | 2014 |
| Therapy Northwest Ltd | Health & social care | 2024 |
| Theregent Design Ltd | Wholesale & retail | 2024 |
| Thinkboost Limited | Information & communication | 2026 |
| Thomas James Holdings Limited | Financial services | 2019 |
| Thomas Vooght Design Limited | Professional & scientific | 2022 |
| Thomason Weaver Limited | Real estate | 2024 |
| Threelevels Limited | Real estate | 2012 |
| Tiamarcia Ltd | Real estate | 2025 |
| TIM Parker Building Ltd | Construction | 2018 |
| Timant Ukeig | | 2005 |
| Timber Heart Ltd | Wholesale & retail | 2025 |
| Tincs Technology Ltd | Information & communication | 2019 |
| Tindo Ltd | Health & social care | 2013 |
| Tink Services Ltd | Professional & scientific | 2025 |
| TIP Top Tree & Groundcare Services Ltd | Administrative & support | 2022 |
| TJK Ventures Ltd | Information & communication | 2018 |
| TLS Oxfordshire Limited | Professional & scientific | 2016 |
| Tmk-Consult Ltd | Professional & scientific | 2020 |
| Tnam.Uk Ltd | Information & communication | 2023 |
| Tokyo Table Ltd | Wholesale & retail | 2020 |
| Tomris Investments Ltd | Real estate | 2026 |
| Tonic Security Solutions Ltd | Administrative & support | 2019 |