| TAV Limited | Hospitality | 2025 |
| Tawil Consulting Ltd | Information & communication | 2025 |
| Tax & PAE Limited | Professional & scientific | 2017 |
| Taxrevo Ltd | Professional & scientific | 2024 |
| TAY Road Amenity Limited | Real estate | 1985 |
| Tayproducts Ltd | Wholesale & retail | 2025 |
| TB Facades Ltd | Construction | 2015 |
| TB Xpress Services Ltd | Transport & logistics | 2015 |
| TBH10 Ltd | Real estate | 2021 |
| Tcche Corp Limited | Administrative & support | 2024 |
| Tcche Ltd | Professional & scientific | 2012 |
| TCI Hire Limited | Administrative & support | 1999 |
| TCK Properties Limited | Real estate | 2022 |
| TCY Capital Ltd | Other services | 2023 |
| TDS Events UK Limited | Wholesale & retail | 2024 |
| TDS Removals Ltd | Transport & logistics | 2019 |
| Tduk Wholesale Ltd | Wholesale & retail | 2015 |
| TE Property Management Ltd | Real estate | 2018 |
| Tea Ceylon Limited | Professional & scientific | 2010 |
| Teach Learn Ecuador | Education | 2010 |
| Teah Ltd | Information & communication | 2014 |
| Teal Foods Limited | Wholesale & retail | 2024 |
| Tech Contracts UK Ltd | Construction | 2019 |
| Tech Inn Limited | Information & communication | 2019 |
| Tech Logic NEO Limited | Wholesale & retail | 2019 |
| Tech R&D Limited | Wholesale & retail | 2014 |
| Techeon Ltd | Information & communication | 2023 |
| Techfix Resale UK Ltd | Wholesale & retail | 2025 |
| Techie Consultanats Ltd | Professional & scientific | 2019 |
| Technet Smart Ltd | Construction | 2023 |
| Technex Limited | Information & communication | 2017 |
| Technic Refrigeration & Aircondition Ltd | Construction | 2020 |
| Technica Security Group Limited | Administrative & support | 2018 |
| Technica Systems Limited | Manufacturing | 1984 |
| Technics Market Ltd | Wholesale & retail | 2018 |
| Techno Packaging Limited | Wholesale & retail | 2012 |
| Technoguru Ltd | Information & communication | 2015 |
| Technologia Solutions Ltd | Information & communication | 2012 |
| Techsphere Commercial Ltd | Wholesale & retail | 2025 |
| Techsynnefo Ltd | Information & communication | 2019 |
| Techtronix Support Ltd | Information & communication | 2025 |
| Tectonic Associates Ltd | Wholesale & retail | 2023 |
| Teddington Hardware 2014 Limited | Wholesale & retail | 2014 |
| Teddybaker Limited | Wholesale & retail | 2019 |
| Teek Ltd | Professional & scientific | 2026 |
| Teena Trading Ltd | Wholesale & retail | 2026 |
| Tekcare UK Ltd | Wholesale & retail | 2018 |
| Tekcellent International Limited | Information & communication | 2012 |
| Teknobits Ltd | Wholesale & retail | 2014 |
| Teldis Limited | Wholesale & retail | 1985 |
| Tele Engineers Limited | Professional & scientific | 2016 |
| Teliologic Ltd | Information & communication | 2019 |
| Teliom Associates Ltd | Real estate | 2020 |
| Tempestransport Ltd | Construction | 2024 |
| Templar Marketing Limited | Professional & scientific | 2022 |
| Templeton Experts Limited | Information & communication | 2017 |
| Tempsford Estates Limited | Real estate | 2017 |
| Temur Halal Meat Ltd | Wholesale & retail | 2018 |
| TEN C Group Ltd | Professional & scientific | 2024 |
| Tent PEG Productions Limited | Information & communication | 2016 |
| Tenter Studio Ltd. | Wholesale & retail | 2015 |
| Teracon Holdings Ltd | Real estate | 2025 |
| Teracon Limited | Construction | 2008 |
| Teresatran Ltd | Hospitality | 2025 |
| Terra and Aqua Build Limited | Construction | 2022 |
| Terravive Commodities UK Limited | Wholesale & retail | 2025 |
| Terry's Garage Limited | Wholesale & retail | 2021 |
| Tesse Akpeki Associates Limited | Professional & scientific | 2012 |
| Test Mango Ltd | Information & communication | 2016 |
| Testhigher Limited | Real estate | 2000 |
| Tetracros Ltd | Transport & logistics | 2017 |
| Textile Reuse and International Development | Wholesale & retail | 1987 |
| TG & Co Property Ltd | Real estate | 2021 |
| TG and Trading Ltd | Wholesale & retail | 2025 |
| TG Real Estate Ltd | Construction | 2021 |
| TGC Interiors Ltd | Construction | 2026 |
| Tghairuk Ltd | Other services | 2023 |
| THA Limited | Other services | 2013 |
| Thai Aroma Ltd | Wholesale & retail | 2025 |
| Thaihut Ltd | Hospitality | 2023 |
| Thajeena Beauty Parlour Ltd | Other services | 2014 |
| Thakkar Traders Limited | Wholesale & retail | 2024 |
| Thakorji Holdings Limited | Wholesale & retail | 2025 |
| Thaksan Ltd | Wholesale & retail | 2021 |
| Thamarai Hospitality Ltd | Professional & scientific | 2026 |
| Thamer Ventilation Limited | Manufacturing | 2021 |
| Thames Premier Service Ltd | Professional & scientific | 2013 |
| Thawany Ltd | Information & communication | 2020 |
| Thaya Restaurant Ltd | Hospitality | 2019 |
| THE 23 Club CIC | Information & communication | 2025 |
| THE Acai Parlour Ltd | Wholesale & retail | 2023 |
| THE Alternate Path Ltd | Education | 2026 |
| THE Angeli Foundation | Health & social care | 2011 |
| THE App Lads Limited | Information & communication | 2019 |
| THE Artisan Difference Ltd | Professional & scientific | 2018 |
| THE Audit & Compliance Executive Limited | Professional & scientific | 2021 |
| THE Audit and Compliance Bureau Ltd | Professional & scientific | 2025 |
| THE Aura Wembley Ltd | Hospitality | 2023 |
| THE Bagel and Shake Factory Limited | Hospitality | 2017 |
| THE Baring Trust | Administrative & support | 2012 |