| Tiger Cheerful Limited | Households | 2024 |
| Tiger Running Ltd | Wholesale & retail | 2025 |
| Tiger the Fresh Limited | Wholesale & retail | 2024 |
| TIK Trade Ltd | Financial services | 2025 |
| Tika Trading Co Ltd | Wholesale & retail | 2024 |
| Timbers Building Ltd | Construction | 2015 |
| Timberzen Limited | Information & communication | 2026 |
| Time Negative Ltd | Wholesale & retail | 2025 |
| Time Star Electronic Commerce Ltd | Wholesale & retail | 2024 |
| Time Tunnel Ltd | Wholesale & retail | 2025 |
| Timei Group Ltd | Wholesale & retail | 2025 |
| Timelywhaletrade Ltd | Wholesale & retail | 2025 |
| Timewell Limited | Real estate | 1986 |
| Timicyn Limited | Wholesale & retail | 2025 |
| Timora Ltd | Information & communication | 2025 |
| Tims Worth Centre Ltd | Real estate | 2025 |
| Ting BAO Commerce and Trade Ltd | Wholesale & retail | 2025 |
| Ting Inghe Limited | Wholesale & retail | 2025 |
| Tingku Ltd | Wholesale & retail | 2023 |
| Tinwin Technology Ltd. | Information & communication | 2025 |
| Tiny Bits Ltd | Information & communication | 2025 |
| Tiny Monster Ltd | Wholesale & retail | 2025 |
| Tiny Roots Nursery Limited | Health & social care | 2025 |
| Tirass Ltd | Extraterritorial | 2024 |
| Titan Protect Ltd | Wholesale & retail | 2025 |
| Titan Stream Limited | Wholesale & retail | 2025 |
| Titan Tuition Limited | Education | 2026 |
| Titanium Telemarketing Ltd | Professional & scientific | 2026 |
| Titihi Limited | Wholesale & retail | 2025 |
| Titiyiy Ltd | Wholesale & retail | 2025 |
| Tiwei Limited | Manufacturing | 2025 |
| Tizzard Trends Ltd | Wholesale & retail | 2025 |
| TJ Agency Ltd | Professional & scientific | 2025 |
| TJ Services (National) Limited | Wholesale & retail | 2014 |
| TJH Electrical Ltd | Construction | 2023 |
| TK Luna Media Limited | Information & communication | 2025 |
| Tkslays Ltd | Wholesale & retail | 2024 |
| Tkwave Media Limited | Wholesale & retail | 2025 |
| TLB Enterprise Ltd | Professional & scientific | 2025 |
| TLC Life Limited | Health & social care | 2017 |
| Tlendo Ltd | Information & communication | 2025 |
| TLM Couture Ltd | Wholesale & retail | 2025 |
| Tlna Limited | Wholesale & retail | 2015 |
| TM Masters Limited | Extraterritorial | 2024 |
| Tmahanaim Ltd | Manufacturing | 2025 |
| TMH Consulting Services (Bath) Limited | Professional & scientific | 2025 |
| TMS Consultants Ltd. | Professional & scientific | 2012 |
| Tnbag Ltd | Wholesale & retail | 2025 |
| TNC Smarthome Co., Ltd | Manufacturing | 2020 |
| TNR Group Ltd | Wholesale & retail | 2025 |
| TNT Management Limited | Construction | 2015 |
| TNW Energy Ltd | Wholesale & retail | 2025 |
| TO Define Ltd | Information & communication | 2025 |
| TO Know Morocco Marketing Limited | Professional & scientific | 2023 |
| Toadstools Cleaning Services Ltd | Administrative & support | 2023 |
| Toby Hedworth Ltd. | Professional & scientific | 2019 |
| Tode Valley Ltd | Wholesale & retail | 2025 |
| Together - Community Wellbeing Support C.I.C. | Health & social care | 2026 |
| Together - Wellbeing Support Ltd | Professional & scientific | 2026 |
| Together and Thrive Residential Care Ltd. | Construction | 2023 |
| Toid Ace Ltd | Real estate | 2020 |
| Tokenaissance Limited | Wholesale & retail | 2024 |
| Tokinft Limited | Information & communication | 2025 |
| Toknex Ltd | Wholesale & retail | 2025 |
| Tokober Ltd | Wholesale & retail | 2025 |
| Told Films Ltd | Information & communication | 2026 |
| TOM Clancy Windows Ltd | Construction | 2026 |
| TOM Hatchwell Ltd | Arts & recreation | 2026 |
| TOM Sands Guitars International Ltd | Manufacturing | 2020 |
| Tombolize Ltd | Arts & recreation | 2025 |
| Tomcat Studio Ltd | Information & communication | 2025 |
| Tomdev Ltd | Information & communication | 2023 |
| Tommac Properties Limited | Real estate | 2015 |
| Tommyrunpt Ltd | Other services | 2024 |
| Tommys Skips Ltd | Water & waste | 2026 |
| Tomorrow Film Limited | Information & communication | 2012 |
| Toner Trader (UK) Ltd | Wholesale & retail | 2014 |
| Toner Trader Europe Ltd | Wholesale & retail | 2013 |
| Tongfang Center Co., Ltd | Wholesale & retail | 2025 |
| Tongsheng International Ltd | Administrative & support | 2014 |
| Tony P Services Limited | Construction | 2025 |
| Toolverse Ltd | Information & communication | 2025 |
| Top Gift Picks Ltd | Wholesale & retail | 2022 |
| Top Suspension Ltd | Administrative & support | 2023 |
| Top Traffic Co Ltd | Wholesale & retail | 2025 |
| Topchem Co., Ltd. | Administrative & support | 2015 |
| Topco Neux Ascent Limited | Financial services | 2025 |
| Topf Dream Ltd | Wholesale & retail | 2025 |
| Topmoor Poultry Ltd | Professional & scientific | 2020 |
| Topnotch Enterprises Limited | Wholesale & retail | 2025 |
| Topsun Lighting Ltd | Wholesale & retail | 2025 |
| Toptier Hats Co., Limited | Wholesale & retail | 2025 |
| Toptrend Shoes Ltd | Wholesale & retail | 2026 |
| Topview Business Limited | Wholesale & retail | 2024 |
| Torinova Health Limited | Information & communication | 2026 |
| Tosc UK Ltd | Wholesale & retail | 2025 |
| Total Lawn Care Ltd | Administrative & support | 2018 |
| Total Logistics Services Ltd | Transport & logistics | 2026 |
| Total Web Services Ltd | Construction | 2021 |
| Totally Beauty UK Ltd | Other services | 2023 |