| THE Wellbeing & Support Foundation | Health & social care | 2021 |
| THE Word Business Limited | Administrative & support | 2008 |
| THE Word Works (London) Limited | Professional & scientific | 2009 |
| THE Yorkshire PUB Company Limited | Hospitality | 2014 |
| THE Zetland Hunt Limited | Arts & recreation | 2004 |
| Theexceptionals Limited | Administrative & support | 2017 |
| Themis Advisory Limited | Professional & scientific | 2018 |
| Thenextwe Ltd | Professional & scientific | 2022 |
| Theplanet Ltd | Extraterritorial | 2007 |
| Therapeutic Technology and Innovation Group Limited | Wholesale & retail | 2021 |
| Thermal Compliance Ltd | Professional & scientific | 2007 |
| Thermal Pavements Limited | Construction | 2024 |
| Thermatech Limited | Administrative & support | 2010 |
| Therme Group Ltd | Health & social care | 2019 |
| Therme Group Services (UK) Limited | Administrative & support | 2019 |
| Therme IPG Ltd | Financial services | 2024 |
| Therme Mapr Limited | Real estate | 2022 |
| Therme North Limited | Health & social care | 2019 |
| Theseahive Limited | Arts & recreation | 2021 |
| Thexton Tax Services Ltd | Professional & scientific | 2018 |
| Think GAS Holdings Limited | Professional & scientific | 2017 |
| Think IT Brew Limited | Professional & scientific | 2018 |
| Thinker Bell Ltd | Arts & recreation | 2016 |
| Third Generation Catlins Limited | Real estate | 2014 |
| Third Iris Films Ltd | Information & communication | 2016 |
| This Demanding Life Ltd | Professional & scientific | 2018 |
| This IS Farm Limited | Professional & scientific | 2019 |
| Thoip | Other services | 1982 |
| Tholomew Ltd | Education | 2025 |
| Thomas Liebers Active Ltd | Education | 2025 |
| Thomo Holdings Ltd | Households | 2024 |
| Thompson & Partners (Richmond) Limited | Real estate | 2002 |
| Thompson Capitol Ltd | Real estate | 2024 |
| Thompson Park Green Ltd | Real estate | 2023 |
| Thornborough Project Management Limited | Manufacturing | 2012 |
| Thorndale Kitchens Ltd | Construction | 2018 |
| Thornton Steward Sailing Club Limited | Arts & recreation | 1974 |
| Thoughtbait Ltd | Information & communication | 2022 |
| Thrive Wellness Yorkshire CIC | Other services | 2025 |
| Tidal Steps Ltd | Construction | 2024 |
| Tidman Mail Order Limited | Real estate | 1971 |
| Tiffany Joiner Ltd | Information & communication | 2016 |
| Tiger Global Projects Limited | Real estate | 2017 |
| Tiggit Software Limited | Information & communication | 2010 |
| Tilly Wood Media Ltd | Information & communication | 2019 |
| TIM Cain Leadership Ltd | Professional & scientific | 2017 |
| Timberlake Consultants Limited | Information & communication | 1996 |
| Timberlake Planning Limited | Construction | 2010 |
| Timberworks Limited | Construction | 2025 |
| Timeless Solutions Limited | Information & communication | 2025 |
| Times UP Button Ltd | Professional & scientific | 2025 |
| Timto Ltd | Construction | 2015 |
| Tiny Explorers Limited | Health & social care | 2024 |
| Tiny Heli Ltd | Administrative & support | 2024 |
| TIT FER TAT Limited | Wholesale & retail | 2001 |
| Titus Legacy Group Ltd | Professional & scientific | 2025 |
| Titus TNM Ltd | Construction | 2024 |
| TJ Traders Ltd | Transport & logistics | 2019 |
| TJS Investments Limited | Administrative & support | 2019 |
| TL Marchmont Partners Ltd | Other services | 2025 |
| Tlke Limited | Wholesale & retail | 2012 |
| TMG Fine Wine & Whisky Ltd | Wholesale & retail | 2021 |
| TMM International Ltd | Financial services | 2024 |
| TO Escape to Limited | Administrative & support | 2003 |
| Tobacco Industry Consultant Engineer Limited | Professional & scientific | 2009 |
| Tobal Consulting Ltd | Professional & scientific | 2011 |
| Tobyn Burnett Gardens Limited | Administrative & support | 2005 |
| Toedmco Ltd | Wholesale & retail | 2026 |
| Toh-Ya Ltd | Hospitality | 2026 |
| Tokyo and York Limited | Wholesale & retail | 2009 |
| Tolg Hair Ltd | Other services | 2020 |
| TOM J Storey Limited | Administrative & support | 2017 |
| TOM Marriott Productions Ltd | Information & communication | 2018 |
| TOM Percival Ltd | Information & communication | 2023 |
| Tomlinson Renewable Energy Solutions Ltd | Professional & scientific | 2023 |
| Tonea TM Ltd | Construction | 2024 |
| Tony Rowe Limited | Administrative & support | 2002 |
| Tony Simpson Limited | Wholesale & retail | 2004 |
| Tony Sunter Build Ltd | Construction | 2003 |
| Tony's Chocolonely Ltd | Wholesale & retail | 2018 |
| Tony’S Mobile Vets Holdings Limited | Professional & scientific | 2025 |
| Tony’S Mobile Vets Ltd | Professional & scientific | 2023 |
| Toogood Group Ltd | Construction | 2022 |
| Top Dog Developments Limited | Information & communication | 2001 |
| Toprak Networking Ltd | Administrative & support | 2016 |
| Torgi Ltd | Hospitality | 2025 |
| Torrero IP Ltd | Information & communication | 2022 |
| Total SO FAR... Ltd | Extraterritorial | 2020 |
| Totus Fire Safety Group Ltd | Construction | 2018 |
| Toucan Communications Ltd | Information & communication | 2017 |
| Touch 4 Health Limited | Health & social care | 2005 |
| Touch the Moon Solutions Limited | Information & communication | 2013 |
| Tour Truck Golf Limited | Wholesale & retail | 2022 |
| Tourcompass Ltd | Administrative & support | 2018 |
| Tourfocus Limited | Administrative & support | 2016 |
| Towfighi Ltd | Manufacturing | 2021 |
| Townsley Property Limited | Real estate | 2020 |
| Townson Plumbing and Heating Ltd | Construction | 2020 |
| Towser Investments Limited | Financial services | 2022 |
| TPG Design Limited | Information & communication | 2002 |