| Toronto 57 Ltd | Hospitality | 2017 |
| Toronto Delivery Limited | Hospitality | 2020 |
| Total Aviation Support Ltd | Manufacturing | 2024 |
| Total Bathrooms and Kitchens Ltd | Construction | 2024 |
| Total Energy Supplies Ltd | Energy | 2024 |
| Total Engineering Services U.K Ltd | Professional & scientific | 2018 |
| Total Finance Solutions Ltd | Financial services | 2023 |
| Total Fitness Oldham Ltd | Arts & recreation | 2026 |
| Total Football UK Hospitality Ltd | Arts & recreation | 2022 |
| Total Property Building & Maintenance Limited | Construction | 2020 |
| Total Resin North West Ltd | Construction | 2018 |
| Total SENSORS2 UK Ltd | Manufacturing | 2016 |
| Total Support Homecare Ltd | Health & social care | 2023 |
| Total Tyre Response Ltd | Wholesale & retail | 2026 |
| Totalbuild Care Ltd | Construction | 2024 |
| Totally Charged EV Limited | Financial services | 2021 |
| Totley Mews Limited | Households | 2013 |
| Touch Solicitors Limited | Professional & scientific | 2018 |
| Tovim Limited | Real estate | 2024 |
| Tower Bridge DRY Cleaners Limited | Other services | 2013 |
| Tower of Salvation | Other services | 2022 |
| Towers Accountancy Services Ltd | Professional & scientific | 2021 |
| Towers Group Ltd | Construction | 2020 |
| Town & Country Tools Limited | Wholesale & retail | 2006 |
| Town and Country Contractors Limited | Construction | 2006 |
| Townfield Car Sales Limited | Wholesale & retail | 1980 |
| Townsend Plumbing & Heating Ltd | Construction | 2023 |
| Toys and Little Gaby Ltd | Information & communication | 2017 |
| Toys and Stuff Ltd | Wholesale & retail | 2022 |
| TPH Eats Group Ltd | Hospitality | 2025 |
| TPS Group Holdings Limited | Financial services | 2023 |
| Trace Debt Recovery UK Limited | Administrative & support | 2016 |
| Trace Enforcement Services Ltd | Other services | 2021 |
| Track Central Ltd | Administrative & support | 2025 |
| Track Guyz Ltd | Administrative & support | 2026 |
| Trackrite Limited | Wholesale & retail | 2003 |
| Trackrite North West Ltd | Wholesale & retail | 2026 |
| Trade & Consulting Services Ltd. | Extraterritorial | 2023 |
| Trade Brain Ltd | Extraterritorial | 2025 |
| Trade Capital Limited | Wholesale & retail | 2019 |
| Trade Debt Recovery Limited | Administrative & support | 2015 |
| Trade Kitchens by DTN Limited | Manufacturing | 2011 |
| Trade World Ltd. | Extraterritorial | 2025 |
| Trademark Property Development Limited | Construction | 2019 |
| Traderway Ltd | Information & communication | 2026 |
| Tradeseekret Ltd | Administrative & support | 2023 |
| Tradestep Ltd | Wholesale & retail | 2026 |
| Tradewise Building Contractors Ltd | Construction | 2023 |
| Tradewise Cars & Commercials Ltd | Wholesale & retail | 2024 |
| Trading and Marketing Ltd | Extraterritorial | 2025 |
| Trading Tutor Ltd | Administrative & support | 2015 |
| Traditional Roofing Limited | Construction | 2011 |
| Tradoverse Limited | Wholesale & retail | 2023 |
| Trafficare Ltd | Transport & logistics | 2022 |
| Trail Brew Co Ltd | Manufacturing | 2024 |
| Trailerteq Holdings Ltd | Administrative & support | 2011 |
| Trailerteq Ltd | Manufacturing | 2009 |
| Train Paleo Limited | Arts & recreation | 2013 |
| TRAIN2BE Limited | Health & social care | 2015 |
| TRAIN4LGV Limited | Education | 2012 |
| Training Academy (Manchester) CIC | Health & social care | 2024 |
| TRAININGONLINE4U Ltd | Administrative & support | 2017 |
| Trainor Plastering Contractors Ltd | Construction | 2017 |
| Traj Holdings Ltd | Health & social care | 2022 |
| Tranquil Beauty Lounge Ltd | Other services | 2018 |
| Tranquil Point Therapy Ltd | Health & social care | 2024 |
| Trans Globe Shipping (UK) Ltd | Transport & logistics | 2026 |
| Trans-Bridge Freight Services Limited | Transport & logistics | 1991 |
| Trans-Web Limited | Manufacturing | 1987 |
| Transaction Security Holdings Limited | Professional & scientific | 2015 |
| Transaction Security Limited | Professional & scientific | 2014 |
| Transcabin Limited | Administrative & support | 1998 |
| Transdrive Engineering Services Limited | Professional & scientific | 1982 |
| Transfinite Technologies Ltd | Wholesale & retail | 2026 |
| Transform Your GUT Limited | Health & social care | 2021 |
| Transformation Plus Ltd | Health & social care | 2026 |
| Transformation Property Developments Ltd | Households | 2020 |
| Transitiontime Limited | Professional & scientific | 2013 |
| Transitley Limited | Professional & scientific | 2025 |
| Transjan M&M Ltd | Transport & logistics | 2018 |
| Transload Haulage Ltd | Transport & logistics | 2018 |
| Transparent Financial Services Group Ltd | Professional & scientific | 2024 |
| Transport Cargo Ltd. | Transport & logistics | 2026 |
| Transport Industry Group Ltd | Professional & scientific | 2026 |
| Transporters Oldham Limited | Transport & logistics | 2024 |
| Trauma to Triumph Mentoring/Boxing/Life Coach Services CIC | Health & social care | 2026 |
| Travel on Time Limited | Transport & logistics | 2018 |
| Travel Xperts PVT. Ltd | Administrative & support | 2021 |
| TRAVEL2U Ltd | Transport & logistics | 2020 |
| Travelwithrochel Ltd | Administrative & support | 2019 |
| Traxley Limited | Construction | 2016 |
| Traybond Limited | Manufacturing | 2000 |
| Treatzonme Ltd | Hospitality | 2026 |
| Tree Builders Ltd | Construction | 2026 |
| Tree Control Ltd | Administrative & support | 2024 |
| Tree Heroes Limited | Administrative & support | 2012 |
| Treetops Nursing Home Limited | Health & social care | 2017 |
| Treetops Property Management Limited | Health & social care | 2017 |
| Trehan Skin Ltd | Health & social care | 2025 |
| Tremsco Ltd | Wholesale & retail | 2015 |