| Tala Skills Limited | Wholesale & retail | 2025 |
| Talawa Fostering Services Limited | Health & social care | 2003 |
| Talent Circles Global Ltd | Professional & scientific | 2023 |
| Talipia Limited | Wholesale & retail | 2002 |
| Talukdar Property Ltd | Real estate | 2025 |
| TAM Hong Limited | Other services | 2020 |
| Tamgee DON Ltd | Other services | 2021 |
| Tami Alecsandra Ltd | Transport & logistics | 2018 |
| Tamil Professionals Network CIC | Education | 2023 |
| TAN Phat Limited | Other services | 2020 |
| TAN Thinh Phat Limited | Other services | 2022 |
| Tanjun Capital Limited | Professional & scientific | 2021 |
| TANNAIL205 Limited | Other services | 2023 |
| Tanrose Property Limited Limited | Construction | 2020 |
| Tansan Limited | Wholesale & retail | 2024 |
| Tanwill Corporation Limited | Health & social care | 2020 |
| Tanzera Private Ltd | Wholesale & retail | 2025 |
| Tapkin Ltd | Other services | 2019 |
| Tapper Property Investments Ltd | Construction | 2026 |
| Tararx Ltd | Wholesale & retail | 2026 |
| Target Care Limited | Health & social care | 2014 |
| Tasbilek Ltd | Extraterritorial | 2024 |
| Task Plan Development Ltd | Construction | 2014 |
| Task Plan Investments Ltd | Real estate | 2024 |
| Tassa Services Limited | Transport & logistics | 2019 |
| Tastan Properties Ltd | Real estate | 2023 |
| Tastemore Stockwell Ltd | Hospitality | 2025 |
| Tasty Dishes Limited | Hospitality | 2025 |
| Tasty Foods (UK) Limited | Wholesale & retail | 2014 |
| Tasty Fruit and VEG Ltd | Wholesale & retail | 2025 |
| Tasty Hour Catering Limited | Hospitality | 2025 |
| Tasty Treats Bakery Ltd | Manufacturing | 2021 |
| Tasty Treats Enfield Limited | Hospitality | 2025 |
| Tatal Limited | Wholesale & retail | 2024 |
| Tatar Investment Ltd | Real estate | 2024 |
| Tatk Limited | Wholesale & retail | 2020 |
| Tatlici Consultacy Limited | Information & communication | 2025 |
| Tatt LAB Studios Ltd | Health & social care | 2025 |
| Taunton Drive Management Company Limited | Real estate | 1982 |
| Tavla Properties Limited | Real estate | 2025 |
| Tax AID Consultancy Ltd | Professional & scientific | 2024 |
| Tax Savers Accounting Ltd | Professional & scientific | 2016 |
| TAX2U Limited | Professional & scientific | 2011 |
| Taxlock Ltd | Professional & scientific | 2015 |
| Taxpert Group Limited | Professional & scientific | 2020 |
| Taxreduce Ltd | Professional & scientific | 2015 |
| Taylor Dolman Limited | Manufacturing | 2005 |
| Taylor Real Estates Limited | Real estate | 2019 |
| Taylor Williams Roofing Ltd | Construction | 2026 |
| Taylor-Law Enterprises Limited | Professional & scientific | 2015 |
| TAZ Locks Ltd | Other services | 2024 |
| Tazaki Cash & Carry Ltd | Wholesale & retail | 2022 |
| Tazaki Foods Limited | Wholesale & retail | 1978 |
| Tbaa Properties Limited | Real estate | 2026 |
| TBS Southern Ltd | Wholesale & retail | 2018 |
| TC Holdco Limited | Financial services | 2025 |
| Tcbuilding Professionals Ltd | Construction | 2012 |
| Tccs Dynamics Ltd | Construction | 2025 |
| Tcdc Holdings Ltd | Administrative & support | 2019 |
| TCL Formwork Ltd | Construction | 2011 |
| TCM Facilities Ltd | Administrative & support | 2026 |
| Tcs-Wpk Structure LP | | 2014 |
| TCS1 Company Limited | Transport & logistics | 2020 |
| TD Nails Limited | Other services | 2019 |
| TDD Property Development Limited | Professional & scientific | 2007 |
| TDT Management Limited | Wholesale & retail | 2025 |
| Team Annam Dance Academy Ltd | Education | 2026 |
| Teatimeshop Ltd | Wholesale & retail | 2025 |
| Tecbridge Ltd | Information & communication | 1995 |
| Tech Construction Enfield Ltd | Construction | 2026 |
| Tech Design and Construction Ltd | Construction | 2019 |
| Tech VD Ltd | Information & communication | 2025 |
| Tech X Sales Limited | Wholesale & retail | 2026 |
| Techdigital Limited | Administrative & support | 2017 |
| Techmax 24 Ltd | Information & communication | 2017 |
| Technakosolutions Ltd | Information & communication | 2025 |
| Technical Systems UK Limited | Other services | 1993 |
| Technilux Assembly Limited | Manufacturing | 2025 |
| Technologic Digital Ltd | Wholesale & retail | 2021 |
| Tecta Maintenance Limited | Construction | 2018 |
| Tecta Systems Limited | Information & communication | 2000 |
| Teefield Home Care Limited | Health & social care | 2018 |
| Teekathy Global Services Ltd | Wholesale & retail | 2023 |
| Tees Limited | Wholesale & retail | 1981 |
| Teevel Property Development Ltd | Real estate | 2022 |
| Teez Hair Limited | Other services | 2018 |
| TEG Venture Properties Ltd | Real estate | 2023 |
| Tekas Law Ltd | Professional & scientific | 2012 |
| Tekena Associates Limited | Information & communication | 2007 |
| Tektraining Limited | Education | 2022 |
| Tekyol UK Limited | Wholesale & retail | 2025 |
| Telematics Consultancy Services Limited | Transport & logistics | 2018 |
| Telemed UK Limited | Health & social care | 2021 |
| Telescope Pictures Limited | Information & communication | 1989 |
| Telfcare Ltd | Health & social care | 2018 |
| Tellitbetter Ltd | Professional & scientific | 2021 |
| Telsol Global Limited | Construction | 2021 |
| Temah Cleaning Agency and Properties Ltd | Administrative & support | 2026 |
| Temimotan Ltd | Administrative & support | 2021 |
| Temiz Global Trading Ltd | Wholesale & retail | 2026 |