| Tiddly Tots Nursery Ltd | Health & social care | 2025 |
| Tiddlywinks Preschool GT Horkesley Community Interest Company | Education | 2008 |
| Tide Investments Suffolk Limited | Financial services | 2024 |
| Tide Path Ltd | Professional & scientific | 2025 |
| Tide to Table Ltd | Wholesale & retail | 2025 |
| Tideline Brickwork Limited | Construction | 2018 |
| Tides Cleaning Group Ltd | Administrative & support | 2019 |
| Tides Facilities Management Ltd | Administrative & support | 2023 |
| Tidewater Psychology Ltd | Extraterritorial | 2022 |
| Tidy Team Cleaning Co. Ltd | Administrative & support | 2024 |
| Tidy Terrace Limited | Administrative & support | 2023 |
| Tierney Garden Services Limited | Administrative & support | 2002 |
| Tiffany Healthcare Limited | Health & social care | 2021 |
| Tiger Products Limited | Wholesale & retail | 2020 |
| Tiggco Ltd | Education | 2020 |
| Tijarafe Group Holdings Limited | Financial services | 2025 |
| Tijolo Properties Limited | Real estate | 2023 |
| Tika Properties Limited | Real estate | 2026 |
| Tilapia Foods Limited | Hospitality | 2022 |
| Tile Design Limited | Construction | 2024 |
| Tile Project Warehouse Ltd | Wholesale & retail | 2021 |
| Tilkey Road Management Limited | Households | 2018 |
| Tilley Distribution UK Limited | Manufacturing | 2008 |
| Tillwicks House Management (1) Limited | Households | 2005 |
| Tillwicks House Management (2) Limited | Households | 2004 |
| Tilstils Ltd | Wholesale & retail | 2026 |
| TIM Allen Windows Limited | Construction | 2003 |
| TIM Consulting Limited | Professional & scientific | 2011 |
| TIM Humphries Physiotherapy Limited | Health & social care | 2003 |
| TIM Quality Care and Support Service LP | | 2014 |
| TIM Sutton Strategy Consulting Ltd | Professional & scientific | 2023 |
| Tim's Prints Ltd. | Wholesale & retail | 2022 |
| Timber Windows Essex Ltd | Wholesale & retail | 2018 |
| Timbers Restaurant Ltd | Hospitality | 2024 |
| Timbers Today Ltd | Manufacturing | 2026 |
| Time and Frequency Solutions Limited | Extraterritorial | 2015 |
| Time Attack Limited | Administrative & support | 2014 |
| Time for YOU Ipswich Ltd | Administrative & support | 2023 |
| Time Line International Limited | Mining & quarrying | 2000 |
| Time Machine London Limited | Wholesale & retail | 2015 |
| Timeless Years Care UK Limited | Health & social care | 2025 |
| Timlec Ltd | Manufacturing | 2014 |
| Timms Catering Ltd | Hospitality | 2018 |
| Timotei Carpentry Ltd | Construction | 2019 |
| TIN Health and Fitness Ltd | Health & social care | 2025 |
| TIN Transformation Services Limited | Information & communication | 2021 |
| Tincat Games Ltd | Professional & scientific | 2022 |
| Tincup Tavern Limited | Hospitality | 2025 |
| Tinkerbelle Limited | Hospitality | 2014 |
| Tins (UK) Limited | Hospitality | 2000 |
| Tinsmith Education Solutions Ltd | Education | 2023 |
| Tiny Champs Limited | Education | 2024 |
| Tip-Top.Com Ltd | Health & social care | 2002 |
| Tipsa Limited | Hospitality | 2019 |
| Tiptree Building Supplies Limited | Construction | 1986 |
| Tiptree Carpets Limited | Wholesale & retail | 2021 |
| Tiptree Community Hub CIC | Hospitality | 2023 |
| Tiptree Conservatories Limited | Construction | 2019 |
| Tiptree Fencing Services | | 1995 |
| Tiptree Hair Salon Limited | Other services | 2025 |
| Tiptree Heath FC | Arts & recreation | 2022 |
| Tiptree JAM Company | Manufacturing | 1905 |
| Tiptree Kebab Ltd | Hospitality | 2025 |
| Tiptree Meals Limited | Hospitality | 2010 |
| Tiptree Nutrition Limited | Wholesale & retail | 2026 |
| Tiptree Plumbing & Heating Ltd | Construction | 2019 |
| Tiptree Press Club Ltd | Hospitality | 2017 |
| Tiptree Titles Ltd | Extraterritorial | 2020 |
| Tiptree Valeting Limited | Wholesale & retail | 2026 |
| Tiptree Volunteers CIC | Other services | 2021 |
| Titan Resale Ltd | Wholesale & retail | 2025 |
| Titans Security Limited | Professional & scientific | 2010 |
| Titon Automation Limited | Extraterritorial | 1982 |
| Titon Components Limited | Extraterritorial | 1975 |
| Titon Developments Limited | Extraterritorial | 1976 |
| Titon Hardware Limited | Manufacturing | 1972 |
| Titon Holdings PLC | Financial services | 1981 |
| Titon Investments Limited | Extraterritorial | 1978 |
| Tiwadar Limited | Health & social care | 2017 |
| Tiwatope International Ltd | Health & social care | 2024 |
| Tixter Ltd | Information & communication | 2022 |
| TJ Education Limited | Education | 2023 |
| TJ Everett Ltd | Arts & recreation | 2021 |
| TJ Fish Bar Ltd | Hospitality | 2024 |
| TJ GAS Ltd | Construction | 2011 |
| TJ Khan Consulting Ltd | Information & communication | 2023 |
| TJ Restaurants Ltd | Hospitality | 2023 |
| TJG Consulting Ltd | Education | 2017 |
| TJM Engineering Services Ltd | Manufacturing | 2021 |
| TK Drake Electrical Contractor Limited | Construction | 1999 |
| TK Logistics&Tech Ltd | Transport & logistics | 2025 |
| TK Travel Solutions Ltd | Administrative & support | 2024 |
| TKH Gosfield Ltd | Hospitality | 2018 |
| TKP Trading Ltd | Wholesale & retail | 2024 |
| TLC Assets Ltd | Administrative & support | 2017 |
| TLC Environmental Services Ltd | Professional & scientific | 2015 |
| TLC Home Developments Ltd | Administrative & support | 2016 |
| TLC Home Group Ltd | Construction | 2015 |
| TLH Asset Holdings Ltd | Transport & logistics | 2025 |
| TLS Utilities Ltd | Construction | 2024 |