| Taxstack Accountants Ltd | Professional & scientific | 2026 |
| Taxstack Group Ltd | Financial services | 2026 |
| Tayleur Leas (Vulcan) Management Company Limited | Households | 2020 |
| Taylor Astor Healthcare Ltd | Manufacturing | 2024 |
| Taylor Edwards Group Ltd | Professional & scientific | 2024 |
| Taylor Made Group (UK) Limited | Financial services | 2023 |
| Taylor Made Housing Ltd | Hospitality | 2018 |
| Taylor Motor Sales Limited | Wholesale & retail | 2022 |
| Taylor's Tree Care Limited | Administrative & support | 2007 |
| Taylormade Group Limited | Construction | 2019 |
| Taylortuck Property Ltd | Real estate | 2021 |
| Tayyabshakoor Ltd | Wholesale & retail | 2025 |
| Tbat Hold Co Limited | Financial services | 2023 |
| TBG Utilities Ltd | Administrative & support | 2024 |
| Tbsb Holdings Limited | Financial services | 2025 |
| TBZ Tomczyk Transport Ltd | Transport & logistics | 2015 |
| TC Conveyancing Limited | Professional & scientific | 2024 |
| TC Derby Limited | Professional & scientific | 2024 |
| Tcast Limited | Professional & scientific | 2016 |
| TCE Monitor Limited | Wholesale & retail | 2021 |
| TCE Transmission Limited | Wholesale & retail | 2008 |
| TCG and Memorabilia Ltd | Wholesale & retail | 2021 |
| Tcoc Ltd | Health & social care | 2018 |
| TCR (Derby) Limited | Manufacturing | 2005 |
| TCS Property Limited | Real estate | 2023 |
| TD Acquisitions Limited | Real estate | 2022 |
| TD Asset Holdings Ltd | Financial services | 2025 |
| TD1 3D Limited | Professional & scientific | 2021 |
| TDE Properties Limited | Real estate | 2024 |
| Tdghcomposites Ltd | Manufacturing | 2026 |
| TDH Property Limited | Real estate | 2005 |
| TDK Property Investment & Management Ltd | Real estate | 2022 |
| TDL Group Ltd | Real estate | 2018 |
| TDM Property Developments Ltd | Real estate | 2022 |
| TDP Diamond Beauty Ltd | Other services | 2024 |
| TDS Dance Studios CIC | Education | 2025 |
| TDS Healthcare Limited | Wholesale & retail | 2004 |
| TE Clegg Building Design Limited | Professional & scientific | 2005 |
| TE Global Ltd | Information & communication | 2023 |
| Tea at Three Melbourne Ltd | Wholesale & retail | 2022 |
| Teaching Displays Limited | Extraterritorial | 2011 |
| Teal (Eco) Ltd | Agriculture & fishing | 2021 |
| Team Aujla Ltd | Professional & scientific | 2022 |
| Team T Events Ltd | Arts & recreation | 2025 |
| Team Telecommunications Group Limited | Financial services | 2004 |
| Teamate AI Limited | Professional & scientific | 2025 |
| Teamlook Clothing Ltd | Wholesale & retail | 2025 |
| Teampatch Limited | Construction | 2016 |
| Teamsports (Derby) Limited | Arts & recreation | 2024 |
| Teamup AI Limited | Information & communication | 2025 |
| TEC Consultancy Limited | Professional & scientific | 2012 |
| Tecforce Holdings Limited | Financial services | 2017 |
| Tecforce Limited | Administrative & support | 1994 |
| Tech Carousel Ltd | Wholesale & retail | 2022 |
| Tech Facility Ltd | Information & communication | 2024 |
| Tech Territory Ltd | Wholesale & retail | 2022 |
| Tech Vezoto Limited | Wholesale & retail | 2021 |
| Tech-Tonic Vehicle Repair Limited | Wholesale & retail | 2018 |
| Techagile Ltd | Information & communication | 2016 |
| Techbuyeruk Ltd | Wholesale & retail | 2026 |
| Techderby CIC | Administrative & support | 2026 |
| Techer Initiative CIC | Education | 2025 |
| Techgrove Ltd | Construction | 2020 |
| Techjam Ltd | Information & communication | 2016 |
| Techmo Ltd | Wholesale & retail | 2025 |
| Technical Power and Maintenance Limited | Construction | 2009 |
| Technicity Limited | Information & communication | 1999 |
| Techniclean FB Ltd | Administrative & support | 2007 |
| Technique Recordings Limited | Information & communication | 2002 |
| Techniscapes Ltd | Other services | 2014 |
| Techno Mania Global Ltd | Other services | 2022 |
| Techno Pulse Recordings Ltd | Arts & recreation | 2024 |
| Techno Republic Ltd | Information & communication | 2024 |
| Technosoft IT Services Limited | Information & communication | 2012 |
| Technova & Homes Limited | Wholesale & retail | 2025 |
| Techprivy Digital Limited | Information & communication | 2025 |
| Techsential Ltd | Construction | 2020 |
| Techserve Infrastructure Ltd. | Information & communication | 2018 |
| Techshire Limited | Information & communication | 1998 |
| Techtaste Solution Ltd | Professional & scientific | 2026 |
| Techtrove Limited | Wholesale & retail | 2026 |
| Techvanta Ltd | Wholesale & retail | 2026 |
| Tecsa Capital Limited | Professional & scientific | 2022 |
| Tecsa Limited | Professional & scientific | 2018 |
| Tecsa Trading UK Limited | Financial services | 2020 |
| Tecsys Limited | Extraterritorial | 1992 |
| Tecthotix Limited | Manufacturing | 2017 |
| Tectona Forestry Ltd | Agriculture & fishing | 2026 |
| TED Engineers(Midlands) Ltd | Professional & scientific | 2019 |
| Teddyslick Ltd | Construction | 2025 |
| Tediflo Limited | Other services | 2012 |
| Teesta Investments Limited | Real estate | 2025 |
| TEK-365 Limited | Information & communication | 2020 |
| Tekcel Ltd | Information & communication | 2016 |
| Tekchain Ltd | Information & communication | 2017 |
| Tekk Solutions Ltd | Information & communication | 2018 |
| Teknon Limited | Manufacturing | 2007 |
| Telecommunications Direct Ltd | Information & communication | 2025 |
| Telecoms Xpence Management Ltd | Information & communication | 2009 |
| Telegram Publishing Ltd | Professional & scientific | 2021 |