| Trecom Writers Limited | Information & communication | 2014 |
| Tree Care Consultancy Limited | Administrative & support | 2016 |
| Tremonia West Ltd. | Financial services | 2018 |
| Trend Developments WKD Limited | Construction | 2012 |
| Trend Investments WKD Limited | Real estate | 2012 |
| Trethake Property Development Ltd | Real estate | 2025 |
| Trevelyan & Company Limited | Professional & scientific | 2002 |
| Trevixglobal Ltd | Wholesale & retail | 2025 |
| Tri-Core Developments Ltd | Construction | 2014 |
| Triangle Realty LLP | | 2007 |
| Tricardo Ltd | Manufacturing | 2023 |
| Tricon Properties Limited | Construction | 2003 |
| Trident Civils Limited | Administrative & support | 2015 |
| Trijunction Holdings | Professional & scientific | 2018 |
| Trim Werks Ltd | Manufacturing | 2023 |
| Trinity Car Sales Ltd | Wholesale & retail | 2024 |
| Trinity Diagnostics Limited | Health & social care | 2013 |
| Trinity Engineering Solutions Ltd | Professional & scientific | 2025 |
| Trinity Holiday Lettings Ltd | Hospitality | 2021 |
| Trinity Lounge & Dessert Ltd | Administrative & support | 2017 |
| Trinity Padel Co Ltd | Arts & recreation | 2026 |
| Trinity Properties Yorkshire Ltd | Real estate | 2023 |
| Trinity Property Services Limited | Real estate | 2023 |
| Trinity Residential Solutions Ltd. | Real estate | 2012 |
| Trinity Secure Ltd | Administrative & support | 2026 |
| Trinity Software Consultancy Limited | Information & communication | 2017 |
| Trinity Water Solutions Limited | Professional & scientific | 2017 |
| Trio Italia (Grange Moor) Ltd | Hospitality | 2024 |
| Triple L Investments Ltd | Transport & logistics | 2012 |
| Triple Two Entertainment Limited | Professional & scientific | 2024 |
| TRIPLEG2022 Ltd | Transport & logistics | 2022 |
| Tripple a Konsult UK Limited | Health & social care | 2013 |
| Trirose Ltd | Households | 2024 |
| Trisha Corfield Property Solutions Ltd | Real estate | 2022 |
| Triventa Labs Ltd | Wholesale & retail | 2025 |
| Trivi Ltd | Real estate | 2020 |
| Troughton Sands Limited | Real estate | 2023 |
| Troyan Properties Ltd | Real estate | 2025 |
| TRU Kore Studios Ltd | Arts & recreation | 2025 |
| Truck & Plant Services Ltd | Manufacturing | 2023 |
| Truckwash Limited | Extraterritorial | 2007 |
| Tructec (Wfld) Ltd | Wholesale & retail | 2012 |
| True Beauty Limited | Health & social care | 2010 |
| True Gate Limited | Administrative & support | 2016 |
| True Prestige Motors Limited | Wholesale & retail | 2020 |
| True Seasons UK Limited | Administrative & support | 2002 |
| Truefix Solutions Ltd | Construction | 2008 |
| Trunkstone Limited | Administrative & support | 2025 |
| Trunorth Rigging Solutions Ltd | Information & communication | 2015 |
| Trust Cyber Ltd | Information & communication | 2025 |
| Trust Eco Limited | Construction | 2016 |
| Trusted Healthcare Ltd | Public administration | 2023 |
| Truth Club Holdings Ltd | Hospitality | 2024 |
| Truth Group Investments Ltd | Hospitality | 2024 |
| TRW Productions Limited | Arts & recreation | 2014 |
| TS2017 Ltd | Real estate | 2026 |
| TSD (Lancashire) Ltd | Hospitality | 2020 |
| TSO Associates Ltd | Administrative & support | 2026 |
| TTC Developments Ltd | Construction | 2018 |
| Ttl-Tooling Systems Limited | Professional & scientific | 2002 |
| Ttrs Truck & Trailer Rental Service Limited | Administrative & support | 2008 |
| Tubs & Taps (Wakefield) Limited | Wholesale & retail | 2011 |
| Tudge Ltd | Real estate | 2019 |
| Tudor Joinery Ltd | Construction | 2020 |
| Tudor ST Logistics Limited | Transport & logistics | 2021 |
| Tukioneki Solutions Ltd | Real estate | 2016 |
| Tunkaradelivery Ltd | Transport & logistics | 2026 |
| Tunney Heating Solutions Ltd | Professional & scientific | 2020 |
| TUR Service Ltd | Construction | 2017 |
| Turbo Turtle Couriers Ltd | Transport & logistics | 2025 |
| Turbojetwash Ltd | Administrative & support | 2018 |
| Turin Construction Limited | Construction | 2024 |
| Turkish Griller Limited | Hospitality | 2019 |
| Turner Monroe Limited | Information & communication | 2024 |
| Turner Supplies Ltd | Wholesale & retail | 2004 |
| Turning Minds Around 2022 CIC | Health & social care | 2022 |
| Turning Page Consulting Ltd | Professional & scientific | 2018 |
| Tutorwave Limited | Education | 2024 |
| Tutti's Pizzeria Ltd | Hospitality | 2023 |
| TVS Accountancy Services Limited | Professional & scientific | 2023 |
| Tvtek Limited | Manufacturing | 2008 |
| TWA Ventures Limited | Real estate | 2023 |
| Tweeve UK Ltd | Information & communication | 2025 |
| Tweeve X Ltd | Information & communication | 2025 |
| Two and Three Ltd | Real estate | 2024 |
| Two Degrees Below Holdings Limited | Financial services | 2024 |
| Two Degrees Below Ltd | Professional & scientific | 2023 |
| Two Hills Homes Ltd | Real estate | 2024 |
| Two Trees Woolley Limited | Construction | 2013 |
| Two's Company Property Ltd | Real estate | 2002 |
| Twotwentythree London Limited | Information & communication | 2020 |
| Twyford Exteriors Limited | Construction | 2026 |
| TX98 Ventures Ltd | Information & communication | 2024 |
| TY Guru Limited | Other services | 2015 |
| Tyler Hoffman Ltd | Professional & scientific | 2016 |
| Tyler Hoffman Properties Ltd | Real estate | 2021 |
| Tyre Warehouse Wakefield Ltd | Wholesale & retail | 2026 |
| Tyto Leasing Limited | Financial services | 2012 |
| TZ Consulting Engineers Ltd | Construction | 2012 |
| Tzabapc Limited | Wholesale & retail | 2016 |