| TCR Carpentry & Joinery Limited | Construction | 2023 |
| Tcr-Property Ltd | Real estate | 2021 |
| TD Accountancy Ltd | Professional & scientific | 2024 |
| TD Construction 1 Limited | Construction | 2019 |
| TD Maintenance Ltd | Construction | 2023 |
| TD Rail Ltd | Other services | 2014 |
| TDA Promotions Ltd | Professional & scientific | 2025 |
| TDC (London) Limited | Other services | 2016 |
| Tdfim Consulting Ltd | Information & communication | 2015 |
| TDL Services Limited | Construction | 2020 |
| TDY Services Ltd | Transport & logistics | 2024 |
| Tea Rooms Remedy UK Ltd | Hospitality | 2023 |
| Tea&Co Limited | Wholesale & retail | 2025 |
| Team Inspire Ltd | Education | 2022 |
| Team JJ Limited | Administrative & support | 2019 |
| Team Technical Services Limited | Administrative & support | 2020 |
| Team-Paw Rescue CIC | Agriculture & fishing | 2025 |
| Teamco Ltd | Education | 2022 |
| Teamco Remote Ltd | Education | 2018 |
| Teamtrans Ltd | Transport & logistics | 2019 |
| Teatots Limited | Arts & recreation | 2015 |
| TEC Contractors Ltd | Construction | 2021 |
| Tech 2 Hire Ltd | Administrative & support | 2019 |
| Tech Elements Ltd | Information & communication | 2014 |
| Tech Guruz Ltd | Wholesale & retail | 2025 |
| Tech Mobile Repair Ltd | Wholesale & retail | 2023 |
| Tech Park Ltd | Information & communication | 2026 |
| Tech Resolve Limited | Professional & scientific | 2009 |
| Tech Revolve Limited | Wholesale & retail | 2025 |
| Tech Tailors Ltd | Manufacturing | 2021 |
| Tech Tees Solution Ltd | Information & communication | 2024 |
| Tech Trader Pro Ltd | Wholesale & retail | 2013 |
| Tech Wave Consultant Ltd | Wholesale & retail | 2026 |
| TECH2DATA Consulting Ltd | Information & communication | 2019 |
| Techava Hardware&Software Solutions Ltd | Information & communication | 2020 |
| Techbd Ltd | Health & social care | 2026 |
| Techcode Ltd | Administrative & support | 2014 |
| Techhark Limited | Wholesale & retail | 2025 |
| Techhat Ltd | Wholesale & retail | 2021 |
| Techienet Limited | Information & communication | 2020 |
| Techneplus UK Limited | Information & communication | 2021 |
| Technet Media Ltd | Professional & scientific | 2024 |
| Technext Solutions Limited | Information & communication | 2024 |
| Technical Education Academy Limited | Information & communication | 2015 |
| Technical Roofing Solutions Ltd | Construction | 2020 |
| Technics Autos Limited | Wholesale & retail | 2006 |
| Technics Properties Limited | Real estate | 2024 |
| Technischen Ltd | Information & communication | 2024 |
| Technocrat Services Ltd | Information & communication | 2022 |
| Technos International (Oxford) Limited | Real estate | 1989 |
| Technospark & Cyberedge Ltd | Information & communication | 2023 |
| Techpassport Ltd | Professional & scientific | 2019 |
| Techprintex Ltd | Manufacturing | 2019 |
| Techtix Ltd | Information & communication | 2025 |
| Techtrio Ltd | Information & communication | 2019 |
| Techtutor Hub Ltd | Education | 2018 |
| Techyots Networks Limited | Information & communication | 2011 |
| Techysoft Solutions Limited | Information & communication | 2013 |
| TECHZONE4U Ltd | Information & communication | 2011 |
| Tecko Ltd | Wholesale & retail | 2024 |
| Teckwise Ltd | Other services | 2021 |
| TED Fenton Sports Limited | Wholesale & retail | 1967 |
| Teddy Bagg Transport Solutions Limited | Transport & logistics | 2024 |
| Teegold Services Limited | Health & social care | 2023 |
| Teemah Consultancy Limited | Financial services | 2017 |
| Tees Global Properties Limited | Real estate | 2024 |
| Tehillah Global Ltd | Health & social care | 2020 |
| Tehmoor Properties Ltd | Real estate | 2023 |
| Tehzeeb Enterprise Ltd | Energy | 2019 |
| Tehzeeb Properties Ltd | Real estate | 2026 |
| TEJ Mobile Limited | Wholesale & retail | 2026 |
| TEK This OUT Security Limited | Administrative & support | 2022 |
| Tekpak Ltd | Wholesale & retail | 2026 |
| Tekra Systems Ltd | Administrative & support | 2026 |
| Tekwiz Ltd | Information & communication | 2025 |
| Telco Lifts Limited | Professional & scientific | 2016 |
| Telefolks Limited | Information & communication | 2020 |
| Teleportlab Ltd | Information & communication | 2021 |
| Telez Ltd | Professional & scientific | 2015 |
| Telle MOI Ltd | Wholesale & retail | 2019 |
| Telltrail Enterprises Limited | Professional & scientific | 1993 |
| Tellybelly Ltd | Professional & scientific | 2015 |
| Teluwo Limited | Real estate | 2022 |
| TEM FIX Ltd | Construction | 2017 |
| Temfads Ltd | Health & social care | 2023 |
| Temphis Limited | Real estate | 2013 |
| Temple Dean Limited | Construction | 2009 |
| Temple of Praise International | Other services | 2009 |
| Temptation Beauty Limited | Other services | 2021 |
| TEN Conifers Ltd | Wholesale & retail | 2022 |
| Tenacity Financial Ltd | Financial services | 2025 |
| Tendali Ltd | Real estate | 2024 |
| Tender Hearts Services UK Limited | Health & social care | 2020 |
| Tenerezza Jewellery Ltd | Wholesale & retail | 2024 |
| Tenneti Investments Ltd | Real estate | 2021 |
| TENO4 Ltd | Manufacturing | 2022 |
| TEO & Vass Ltd | Administrative & support | 2016 |
| Teoclau Limited | Wholesale & retail | 2017 |
| TER Carpentry Ltd | Construction | 2024 |
| Teri Mcguinness Hairdressing Limited | Other services | 2024 |