| Tayberry Investments Ltd | Real estate | 2021 |
| Tayler Design Limited | Professional & scientific | 2015 |
| Taylor Joint Enterprises Limited | Health & social care | 2010 |
| Taylor’S Trails and Happy Tails Ltd | Other services | 2025 |
| TBA Engineering Ltd | Arts & recreation | 2026 |
| TBI Brands Ltd | Wholesale & retail | 2025 |
| TCM Healthcare Group Limited | Health & social care | 2022 |
| Tcye Limited | Transport & logistics | 2020 |
| Tdas Limited | Professional & scientific | 2008 |
| Teal Associates (SE) Limited | Financial services | 2024 |
| Tealium Limited | Information & communication | 2012 |
| Team MH Ltd | Wholesale & retail | 2024 |
| Team Ordrs Ltd | Manufacturing | 2024 |
| Teamlytica Ltd | Information & communication | 2018 |
| Tech Business Connected Ltd | Administrative & support | 2019 |
| Tech Matrix Consultancy Ltd | Professional & scientific | 2026 |
| Tech Relief Ltd | Extraterritorial | 2020 |
| Technosolve GB Ltd | Information & communication | 2005 |
| Technovate-Saudi Limited | Information & communication | 2020 |
| Teeth Boutique Limited | Health & social care | 2011 |
| Tejashree Medical Limited | Health & social care | 2014 |
| Tekneofy Consulting Limited | Information & communication | 2025 |
| Teknos (UK) Limited | Manufacturing | 1991 |
| Telecom 10 Ltd | Other services | 2009 |
| Telford Project Management Ltd | Professional & scientific | 2016 |
| Telios AI Holdings Limited | Information & communication | 2020 |
| Telios AI Limited | Information & communication | 2014 |
| Temple Smith Hart LLP | | 2012 |
| Terravision Limited | Professional & scientific | 2001 |
| Territrans Ltd | Transport & logistics | 2016 |
| Tetasevi Ltd | Other services | 2025 |
| Tetraboost Limited | Extraterritorial | 2018 |
| Text & Layout Ltd | Information & communication | 2026 |
| Tfcd Solutions Ltd | Construction | 2019 |
| TFG Golden Key Ltd | Professional & scientific | 2013 |
| TFH Design Ltd | Professional & scientific | 2024 |
| Tgbc Holdings Ltd | Construction | 2025 |
| Thalatha Ltd | Wholesale & retail | 2018 |
| Thame Developments Limited | Real estate | 2013 |
| Thame Massage & Wellbeing Centre Limited | Other services | 2020 |
| Thame One Stop Limited | Wholesale & retail | 2005 |
| Thame Roofing Limited | Construction | 2023 |
| Thames Cable Co. Ltd | Construction | 2025 |
| Thames Valley Refurbishment Limited | Construction | 2005 |
| THB Consultants Limited | Professional & scientific | 2016 |
| THE Ackee POT Ltd | Hospitality | 2025 |
| THE Acquisition Collective Ltd | Financial services | 2025 |
| THE Almond Tree Hotel Ltd | Hospitality | 2023 |
| THE Aria Agency Ltd. | Professional & scientific | 2002 |
| THE Arts Excite CIC | Education | 2015 |
| THE B2B Marketing Expert Limited | Professional & scientific | 2021 |
| THE Bank Dental Practice Limited | Health & social care | 2008 |
| THE Beehive Hair Studio Oxfordshire Limited | Other services | 2024 |
| THE Bicester Aerodrome Company Limited | Transport & logistics | 2020 |
| THE Big Bottom Company Limited | Agriculture & fishing | 2018 |
| THE Big FAT One Ltd | Arts & recreation | 2021 |
| THE Binary Refinery Limited | Information & communication | 2010 |
| THE BLK Label Group Limited | Wholesale & retail | 2017 |
| THE Body Performance Therapy Centre Ltd | Arts & recreation | 2024 |
| THE Bosphorus Kitchen Limited | Hospitality | 2022 |
| THE Canopies Milton Limited | Households | 2026 |
| THE Compliance MAP Limited | Information & communication | 2015 |
| THE Computer Clinic Bicester Limited | Other services | 2013 |
| THE Corporate Alliance Limited | Professional & scientific | 2020 |
| THE Cotswilds Group Ltd | Other services | 2025 |
| THE Cotswold Bespoke Company (Oxfordshire) Ltd | Construction | 2026 |
| THE Cotswold Chocolate Company Limited | Hospitality | 2003 |
| THE Cotswold Concierge (Property & Lifestyle Management) Ltd | Real estate | 2026 |
| THE Cricket Bunker Ltd | Education | 2025 |
| THE Cupping Therapy Limited | Health & social care | 2015 |
| THE Diamond Xpert Ltd | Wholesale & retail | 2022 |
| THE Dirty Cat Company Limited | Extraterritorial | 2002 |
| THE Drapery Workroom Ltd | Arts & recreation | 2017 |
| THE Dyscalculia Network C.I.C. | Education | 2021 |
| THE Ekisa Project Limited | Health & social care | 2024 |
| THE Emergency Lighting Company Limited | Construction | 2021 |
| THE Empowering Entrepreneur Ltd | Other services | 2019 |
| THE Engineering Trust | Education | 1983 |
| THE Event Business Limited | Professional & scientific | 1994 |
| THE Event Nest Ltd | Professional & scientific | 2021 |
| THE Evergreen Agency Limited | Professional & scientific | 2014 |
| THE EYE Property Investment Ltd | Real estate | 2024 |
| THE FAT Zebra Ltd | Hospitality | 2021 |
| THE Financial Confidence Company Ltd | Administrative & support | 2023 |
| THE Fmcg Consultancy Limited | Professional & scientific | 2025 |
| THE FOX Inn Souldern Limited | Hospitality | 2022 |
| THE Gentleman Blacksmith Ltd | Manufacturing | 2019 |
| THE Good Place Residential Property Limited | Real estate | 2022 |
| THE Grain Store Cafe Ltd | Hospitality | 2023 |
| THE Granite House Limited | Manufacturing | 2004 |
| THE Healthy Juice Company Limited | Administrative & support | 2014 |
| THE Heatpump Shop Limited | Construction | 2008 |
| THE Hoot Group Limited | Professional & scientific | 2002 |
| THE HR & OD Consultancy Ltd | Professional & scientific | 2023 |
| THE Imcc Limited | Administrative & support | 2021 |
| THE Independent Funeral Partnership 2020 Limited | Other services | 2020 |
| THE Indian Pantry (Marlow) Ltd | Hospitality | 2019 |
| THE Investor Ladder Limited | Hospitality | 2016 |
| THE J Francis Group Limited | Professional & scientific | 2019 |
| THE JFK Group Ltd | Administrative & support | 2017 |