| Teranga Ltd | Construction | 2024 |
| Terpar Greentec Ltd | Extraterritorial | 2016 |
| Terrapelagos Ltd | Other services | 2022 |
| Tetra Capital Ltd | Construction | 2022 |
| Thames Ceilings Limited | Construction | 1986 |
| Thames Valley Carpentry Limited | Manufacturing | 2021 |
| That Help Company Ltd | Information & communication | 2022 |
| That Taxi Company Ltd | Transport & logistics | 2018 |
| THE 14 Chantry Road Bristol Management Company Limited | Extraterritorial | 1998 |
| THE Adare Group Limited | Professional & scientific | 2025 |
| THE Advertiser Magazine Limited | Information & communication | 2012 |
| THE Artificial Grass Wizards Ltd | Administrative & support | 2021 |
| THE Black Horse (East Hanney) Limited | Hospitality | 2024 |
| THE BOY in the Corner Limited | Arts & recreation | 2008 |
| THE Buying Agents (Rbkc) Ltd | Real estate | 2010 |
| THE Cake Shop Limited | Wholesale & retail | 2002 |
| THE Campaign for Shared European Values | Other services | 2019 |
| THE Career Boutique (International) Limited | Extraterritorial | 2010 |
| THE Career Boutique Limited | Administrative & support | 2009 |
| THE Charging Partnership Ltd | Professional & scientific | 2019 |
| THE Cleanologists Ltd | Administrative & support | 2023 |
| THE Comic Pastor PVT Limited | Information & communication | 2025 |
| THE Croft (Marcham) Management Company Limited | Households | 2011 |
| THE CX Consultancy Group Limited | Information & communication | 2025 |
| THE Eureka Group Ltd | Financial services | 2019 |
| THE Events Raccoon Ltd | Other services | 2016 |
| THE Faulty Towers Experience Limited | Extraterritorial | 2011 |
| THE Firs (Grove) Management Company Limited | Households | 2016 |
| THE Firs (Whitchurch) Management Company Limited | Real estate | 2002 |
| THE Generous APE Limited | Wholesale & retail | 2019 |
| THE Gray Jays Company Limited | Professional & scientific | 1999 |
| THE Greeting Card Association | Other services | 1929 |
| THE Grocer Chef Limited | Hospitality | 2011 |
| THE Hartland Podiatry Clinic Limited | Health & social care | 2012 |
| THE Heritage Bakery Limited | Financial services | 2021 |
| THE Innovation Lounge Ltd | Professional & scientific | 2009 |
| THE Lonely Female Founders Club Ltd | Other services | 2025 |
| THE Lynch (East Hendred) Management Company Limited | Households | 2019 |
| THE Montessori House Wantage Ltd | Education | 2024 |
| THE Mother Goose Group Ltd | Financial services | 2026 |
| THE Muscle Department Ltd | Other services | 2024 |
| THE National Pawnbrokers' Association | Other services | 1931 |
| THE OCM Group (Holdings) Ltd | Professional & scientific | 2007 |
| THE OCM Group Limited | Professional & scientific | 1998 |
| THE Old Wantage Print Works Management Company Limited | Real estate | 2001 |
| THE Outdoor Training Company Limited | Arts & recreation | 2020 |
| THE Oxford Coffee Company Limited | Wholesale & retail | 2011 |
| THE Oxford Plastering Company Ltd | Construction | 2025 |
| THE Oxford Property Fund Limited | Real estate | 2011 |
| THE Performance Sports Group LLP | | 2017 |
| THE Plough at Hanney Ltd | Hospitality | 2021 |
| THE Posh Pundit Racing Club Limited | Arts & recreation | 2022 |
| THE Propeller Academy Trust | Education | 2012 |
| THE Rawly Good Food Company Limited | Wholesale & retail | 2016 |
| THE Red House Restoration Company Ltd | Real estate | 2017 |
| THE Redeemed Christian Church of GOD (Rccg) Lighthouse Abingdon | Other services | 2024 |
| THE Richard Dawkins Foundation for Reason and Science Limited | Information & communication | 2006 |
| THE Shaken NOT Stirred Club Limited | Other services | 2020 |
| THE Southern Heat Pump Specialist Ltd | Construction | 2022 |
| THE Stables (East Hanney) Residents Management Company Limited | Households | 2017 |
| THE Three Homigos Limited | Real estate | 2024 |
| THE Trade Credit Company Limited | Other services | 2021 |
| THE Travel Insider Ltd | Administrative & support | 2024 |
| THE Volunteer PUB Grove Ltd | Hospitality | 2023 |
| THE Wantage Pilates Studio Ltd | Health & social care | 2018 |
| THE Way of the WHY Ltd | Professional & scientific | 2020 |
| THE Williams F1 Team Foundation | Extraterritorial | 2010 |
| Thermacore Ltd | Professional & scientific | 2026 |
| Thermal Contractors Limited | Construction | 2003 |
| Thin Edge Ltd | Real estate | 2025 |
| Think Flow Consulting Limited | Administrative & support | 2015 |
| Thinking Education Ltd | Education | 2012 |
| THIRTY15 Ltd | Arts & recreation | 2025 |
| Thistledown Renovations Ltd | Construction | 2024 |
| Thomas Hibberd Construction Ltd | Construction | 2014 |
| Threatsoft Ltd | Information & communication | 2023 |
| Threeways Garage (UK) Ltd | Wholesale & retail | 2013 |
| Thrive Finch Accounting Limited | Professional & scientific | 2023 |
| Tictac Communications Limited | Professional & scientific | 2000 |
| Tictac Holdings Limited | Professional & scientific | 2015 |
| Tidalzone Ltd | Information & communication | 2010 |
| Tikka and Tadka Ltd | Hospitality | 2025 |
| Tillbourne Limited | Professional & scientific | 2026 |
| Timbermark Identification Systems Limited | Administrative & support | 2004 |
| Tk.Accommodation Ltd | Real estate | 2023 |
| TLC Installations Limited | Manufacturing | 2004 |
| TLN Assisted Living Ltd | Households | 2024 |
| TOM Salmon Landscaping Ltd | Administrative & support | 2022 |
| Top Agencies Limited | Professional & scientific | 2010 |
| Toro Energética Limited | Professional & scientific | 2026 |
| Toxicologic Ltd | Professional & scientific | 2017 |
| Toxicology and Risk Assessment Consulting Ltd | Professional & scientific | 2018 |
| Tozem Investments Limited | Real estate | 2022 |
| TPP Props Ltd | Other services | 2013 |
| Trabecular Ltd | Professional & scientific | 2024 |
| Trade Flow Technology Limited | Information & communication | 2023 |
| Tradespal Ltd | Construction | 2026 |
| Tramway House Office Services Limited | Administrative & support | 2026 |
| Transact Global Technologies Ltd | Information & communication | 2016 |
| Transformacy Group Ltd | Information & communication | 2024 |