| Total Fire Stopping Inspections Ltd | Construction | 2024 |
| Total Health and Sports Limited | Wholesale & retail | 2018 |
| Total Hygiene Solutions Limited | Other services | 1998 |
| Total Lead Confirmation Ltd | Other services | 2023 |
| Total Products Ltd | Wholesale & retail | 2019 |
| Total RDF Limited | Water & waste | 2023 |
| Total Safety Care Limited | Administrative & support | 2022 |
| Total Salon Supplies Limited | Wholesale & retail | 2018 |
| Total Station Engineering Limited | Construction | 2014 |
| Total Trader Ltd | Wholesale & retail | 2025 |
| Total-Drive.Com Limited | Extraterritorial | 1996 |
| Totally Polished Drig Limited | Other services | 2022 |
| Totalreact Solutions Ltd | Construction | 2025 |
| Totalrewind Limited | Wholesale & retail | 2016 |
| Totl Health Ltd. | Health & social care | 2016 |
| Totl Limited | Construction | 2016 |
| Tottenham Limited | Wholesale & retail | 2025 |
| Tough Property Solutions Ltd | Hospitality | 2020 |
| Tough Water Solutions Ltd | Construction | 2007 |
| Tourable Limited | Arts & recreation | 2013 |
| Tourer World - Huddersfield Ltd | Transport & logistics | 2024 |
| Tovli Ltd | Wholesale & retail | 2018 |
| TOW & Go Caravans Limited | Other services | 2024 |
| Tower Centre Hoddesdon Limited | Construction | 2010 |
| Town & Country Properties (UK) Limited | Real estate | 2003 |
| Town Taxis (Bradford) Ltd | Transport & logistics | 2014 |
| Townend Investments Ltd | Real estate | 2023 |
| Townend Ventilation Services Ltd | Construction | 2010 |
| Townend Ventilations Ltd | Manufacturing | 2017 |
| Towsh Co Ltd | Hospitality | 2022 |
| Toys Valley Ltd | Wholesale & retail | 2020 |
| TP Care Limited | Health & social care | 2014 |
| TP Computers Ltd | Information & communication | 2024 |
| TPC Landscapes & Driveways Ltd | Construction | 2025 |
| Tpillar Ltd | Wholesale & retail | 2026 |
| TPK Safety Limited | Professional & scientific | 2010 |
| TPK Synergy Limited | Wholesale & retail | 2023 |
| TR Couriers Ltd | Transport & logistics | 2025 |
| TR Props Limited | Administrative & support | 2022 |
| TR17VEL2AIRPORT Ltd | Transport & logistics | 2022 |
| Trace Audio Visual Limited | Administrative & support | 2023 |
| Track IT Ltd | Wholesale & retail | 2025 |
| Trackdrive Ltd | Information & communication | 2026 |
| Tracsww Ltd | Transport & logistics | 2025 |
| Trade Assist Limited | Wholesale & retail | 2023 |
| Trade Blinds Ltd | Other services | 2024 |
| Trade Frame Yorkshire Limited | Construction | 2022 |
| Trade Kitchen Suppliers Ltd | Manufacturing | 2023 |
| Trade Luxury Limited | Extraterritorial | 2018 |
| Trade Marketing (UK) Limited | Wholesale & retail | 2002 |
| Trade Nexus Ltd | Wholesale & retail | 2021 |
| Trade Stairlifts Limited | Extraterritorial | 2008 |
| Trade Stays Direct Ltd | Hospitality | 2025 |
| Trade Tech Ltd | Wholesale & retail | 2026 |
| Tradeelectro Limited | Wholesale & retail | 2026 |
| Tradelane Retail Ltd | Wholesale & retail | 2025 |
| Trademark Legal Ltd | Professional & scientific | 2020 |
| Trademark Registration Ltd | Professional & scientific | 2026 |
| Tradenova Ltd | Wholesale & retail | 2025 |
| Traderzk Limited | Financial services | 2025 |
| Tradeserve (Northern) Ltd | Construction | 2020 |
| Tradex Group Ltd | Transport & logistics | 2025 |
| Tradex International Limited | Wholesale & retail | 2017 |
| Tradibly Ltd | Information & communication | 2023 |
| Trading Post Enterprises Ltd | Households | 2018 |
| Tradingwithtan Ltd | Wholesale & retail | 2024 |
| Tradozo Ltd | Wholesale & retail | 2026 |
| Trafalgar Ashton Limited | Hospitality | 2026 |
| Trafalgar Estates (UK) Limited | Real estate | 2006 |
| Trafalgar Street Properties Ltd | Real estate | 2025 |
| Train to Drive Limited | Education | 2025 |
| TRAIN2EARN Ltd | Education | 2024 |
| Training Cave Ltd | Education | 2017 |
| Training for Learning Limited | Administrative & support | 2002 |
| Trampfit Limited | Arts & recreation | 2015 |
| Tranquil Skies Ltd | Other services | 2024 |
| Tranquility (Sports Massage Specialists) Ltd | Other services | 2021 |
| Trans Pennine Bearing Company Limited | Wholesale & retail | 1981 |
| Transcript Services Limited | Administrative & support | 2015 |
| Transferz Ltd | Transport & logistics | 2023 |
| Transfield Developments Limited | Real estate | 2014 |
| Transfield Properties Limited | Real estate | 2010 |
| Transform People Development Ltd | Education | 2025 |
| Transform Properties Yorkshire Ltd | Real estate | 2023 |
| Transformed Care Limited | Wholesale & retail | 2016 |
| Transformed Kingdom Power Ministries | Information & communication | 2009 |
| Transforming Lives for Good (TLG) Ltd | Education | 1998 |
| Transgulf Ltd | Wholesale & retail | 2020 |
| Transit Line Logistics Ltd | Transport & logistics | 2026 |
| Transpennine Projects (Millergate) Ltd | Real estate | 2019 |
| Tranter SPV Limited | Real estate | 2023 |
| Tranx Ltd | Information & communication | 2025 |
| TRAP365 Ltd | Wholesale & retail | 2025 |
| Travel 2 (BFD) Limited | Transport & logistics | 2017 |
| Travel 2HM Limited | Real estate | 2015 |
| Travel Care UK Ltd | Administrative & support | 2021 |
| Travel East Limited | Wholesale & retail | 2024 |
| Travel Express Yorkshire Ltd | Transport & logistics | 2023 |
| Travel King U.K Ltd | Administrative & support | 2018 |
| Travel Orbit Ltd | Hospitality | 2026 |