| Technology Yorkshire Ltd | Wholesale & retail | 2014 |
| Techspection Limited | Mining & quarrying | 2017 |
| Techstream Group Ltd | Information & communication | 2019 |
| Techzoom(Dunsville) Limited | Hospitality | 2016 |
| Tecon Solutions Limited | Information & communication | 2006 |
| TECSILA03 Ltd | Transport & logistics | 2019 |
| TED & Dave Limited | Hospitality | 2023 |
| Teddy Touch Healthcare Ltd | Health & social care | 2023 |
| Tedstone Investments Limited | Financial services | 2013 |
| Tedtm Ltd | Construction | 2018 |
| Tedx Doncaster CIC | Education | 2019 |
| TEE Java Healthcare Ltd | Health & social care | 2025 |
| TEE Martin Ltd | Information & communication | 2020 |
| TEE Square Limited | Professional & scientific | 1997 |
| Teebrook Ltd | Information & communication | 2023 |
| Teeclothiers Limited | Wholesale & retail | 2024 |
| Teeglamour Ltd | Wholesale & retail | 2026 |
| Tega Exclusive International Ltd | Wholesale & retail | 2025 |
| TEK FOX Ltd | Information & communication | 2024 |
| Teknequip Limited | Manufacturing | 1961 |
| Telco Investment Assets Ltd. | Extraterritorial | 2015 |
| Tele Services Ltd | Wholesale & retail | 2021 |
| Tele Servicess Ltd | Wholesale & retail | 2026 |
| Telic Engineering Ltd. | Manufacturing | 2010 |
| Telic Holding Ltd. | Financial services | 2010 |
| Temorva Ltd | Construction | 2025 |
| Temp-A-Fence Limited | Information & communication | 2025 |
| Temperton Agricultural Consultancy Ltd | Administrative & support | 2025 |
| Tempestas Omnes Hull Limited | Construction | 2020 |
| Tempestas Omnes Peterborough Limited | Construction | 2020 |
| Temple & Scott Investment Group Limited | Construction | 2022 |
| Temple Property Management Ltd | Real estate | 2025 |
| Templejoinery Ltd | Construction | 2022 |
| Templestowe Electrical Ltd | Construction | 2022 |
| Tempus Quercus Limited | Wholesale & retail | 2026 |
| TEN Hill Limited | Real estate | 2021 |
| Tenancybar Ltd | Hospitality | 2023 |
| Tencivo Lines Ltd | Wholesale & retail | 2022 |
| Tender BUD Limited | Professional & scientific | 2025 |
| Teneo Adhesives Consulting Ltd | Professional & scientific | 2024 |
| Tensology Ltd | Professional & scientific | 2011 |
| Tensology Trustees Limited | Professional & scientific | 2021 |
| TEO & TUD Logistics Ltd | Transport & logistics | 2019 |
| TEP Events Ltd | Other services | 2023 |
| Tera Life Ltd | Wholesale & retail | 2025 |
| Tera Properties Ltd | Real estate | 2019 |
| Terra Ingenia Engineering Consultancy Ltd | Professional & scientific | 2014 |
| Terra-X Park Limited | Arts & recreation | 2025 |
| Terrafirma Site Services Limited | Construction | 2021 |
| Terraflekt Ltd | Wholesale & retail | 2025 |
| Terri Harper Boxing Ltd | Arts & recreation | 2019 |
| Terri Pashley Photography Ltd | Professional & scientific | 2026 |
| Terriann 123 Diet Plan Ltd | Wholesale & retail | 2013 |
| Terrinvest & Co. LLP | | 2011 |
| Tesoro Group Ltd | Financial services | 2021 |
| Tessa Goldsack Ltd | Education | 2025 |
| Testing Installation Correlation Services (Global) Limited | Construction | 2010 |
| TET Mark One Limited | Professional & scientific | 2010 |
| Texdate Limited | Construction | 2017 |
| Textint Limited | | 1982 |
| Tezcan Food Ltd | Hospitality | 2026 |
| TFD Homes Ltd | Real estate | 2022 |
| TFG Capital Limited | Financial services | 2014 |
| TFG Capital NO.2 Limited | Financial services | 2018 |
| TFG Capital NO.3 Limited | Financial services | 2019 |
| TFG Capital Property Limited | Real estate | 2017 |
| TFS National Limited | Construction | 2009 |
| TFS Services Ltd | Professional & scientific | 2020 |
| Tg&Jg Builders Ltd | Construction | 2023 |
| TGE Construction Limited | Construction | 2016 |
| TGH Europe Ltd | Professional & scientific | 2025 |
| TGM Creative Ltd | Professional & scientific | 2021 |
| Tgp-Uk Ltd | Professional & scientific | 2016 |
| TH Imports Ltd | Wholesale & retail | 2023 |
| Thalvex Capital Ltd | Extraterritorial | 2026 |
| Thames Programs Ltd | Manufacturing | 2019 |
| Thames Street Hotel Limited | Real estate | 2024 |
| Thandi Supermarkets Ltd | Extraterritorial | 2003 |
| Thcuk Limited | Wholesale & retail | 2020 |
| THE 2018 Lounge Limited | Administrative & support | 2016 |
| THE Abbeys (Rawmarsh) Limited | Health & social care | 2014 |
| THE Abdita Limited | Wholesale & retail | 2017 |
| THE Adsetts Partnership | Professional & scientific | 2009 |
| THE Aesthetic Place Ltd | Health & social care | 2019 |
| THE Airporter (Yorkshire) Limited | Transport & logistics | 2026 |
| THE Aligned Business School Limited | Education | 2025 |
| THE Apollo Charitable Trust | Extraterritorial | 2006 |
| THE Assistant Quarters Ltd. | Administrative & support | 2017 |
| THE Attar Vault Ltd | Wholesale & retail | 2026 |
| THE Attractive Male Physique Ltd | Health & social care | 2026 |
| THE Badger Doncaster Ltd | Wholesale & retail | 2020 |
| THE Bakers Shop (Balby) Limited | Wholesale & retail | 2025 |
| THE Bangla Chef Ltd | Hospitality | 2022 |
| THE Bar Hire Company Limited | Hospitality | 2019 |
| THE Barber’S Store Ltd | Wholesale & retail | 2025 |
| THE Beauty Unit - Treatments & Training Ltd | Other services | 2020 |
| THE Best Barber (Doncaster) Limited | Other services | 2024 |
| THE Birch Valley Limited | Financial services | 2025 |
| THE Bless Pro Limited | Real estate | 2020 |
| THE Bloomhouse Project CIC | Education | 2025 |