| TLB Leisure Ltd | Hospitality | 2009 |
| TLF Hire Limited | Administrative & support | 2024 |
| TLR Fireplaces West Yorkshire Ltd | Wholesale & retail | 2018 |
| TLT Security Solutions Limited | Professional & scientific | 2003 |
| TM Raven Ltd | Hospitality | 2025 |
| TMG Contract Coding Ltd | Professional & scientific | 2020 |
| TMH Automation Ltd | Information & communication | 2026 |
| TMT Health Care Limited | Real estate | 2007 |
| TNC Group Limited | Wholesale & retail | 2025 |
| TNC Pubs Limited | Hospitality | 2025 |
| TO HUS Immobilien Ltd. | Construction | 2008 |
| TO Wander the World Ltd | Administrative & support | 2024 |
| Toasty Cafe Ltd | Hospitality | 2024 |
| Tobenna Ltd | Administrative & support | 2019 |
| TOC Wakefield Ltd | Hospitality | 2024 |
| Together After Ltd | Health & social care | 2025 |
| Togitec Ltd | Information & communication | 2021 |
| Toiletry Sales Group Limited | Professional & scientific | 2012 |
| Toiletry Sales Holdings Limited | Financial services | 2019 |
| Tolpage Services Ltd. | Professional & scientific | 2022 |
| Tolvintage Limited | Wholesale & retail | 2025 |
| TOM W. Beaumont Limited | Water & waste | 2004 |
| Tom's Talks Limited | Information & communication | 2020 |
| Tomic Couriers Ltd | Extraterritorial | 2021 |
| Tomorrow's Future Limited | Professional & scientific | 2014 |
| Tonic Supply Ltd | Wholesale & retail | 2023 |
| Tony Allerton Construction Management Ltd | Construction | 2026 |
| Tony Harrison Limited | Transport & logistics | 2012 |
| Tony Revans Financial Planning (EOT) Ltd | Financial services | 2024 |
| Tony Revans Financial Planning 2000 Limited | Financial services | 2020 |
| Tony Revans Financial Planning Limited | Financial services | 2008 |
| TOO Dulieu Investments Limited | Real estate | 2024 |
| TOO Dulieu Properties Limited | Real estate | 2016 |
| Tool Planet Ltd | Wholesale & retail | 2024 |
| Toolsplanet Ltd | Other services | 2024 |
| Toor Medical Ltd | Health & social care | 2021 |
| Top Dog Property Management Ltd | Real estate | 2024 |
| Top Gear Couriers Limited | Transport & logistics | 2022 |
| Top Nails Wakefield Ltd | Other services | 2024 |
| Top Shawarma Ltd | Hospitality | 2026 |
| Top Treads Property Holdings Limited | Extraterritorial | 2017 |
| Top Treads Property Limited | Real estate | 1998 |
| Top Treads Trade Holdings Limited | Financial services | 2018 |
| Top Twenty Shirt Company Limited(The) | Professional & scientific | 1965 |
| Topa Properties Limited | Real estate | 2021 |
| Topflight Uniforms Limited | Professional & scientific | 1965 |
| Topflite Motors Limited | Wholesale & retail | 2003 |
| Toplevelleadership Limited | Administrative & support | 2011 |
| Toposnomos Ltd | Professional & scientific | 2006 |
| Tordoff and Co Accountants Limited | Professional & scientific | 2020 |
| Toro Commercial Decorating Contractors Ltd | Construction | 2024 |
| Toshel Limited | Professional & scientific | 2014 |
| Total 3D Services Ltd | Professional & scientific | 2024 |
| Total Ground Control Ltd | Administrative & support | 2022 |
| Total Hvac & Heat Pumps Ltd | Construction | 2023 |
| Total Pest Control (Yorkshire) Limited | Administrative & support | 2023 |
| Total Recruit Ltd | Information & communication | 2020 |
| Total Site Supply UK Ltd | Wholesale & retail | 2026 |
| Total Trading (UK) Limited | Wholesale & retail | 2004 |
| Totally in Love Ltd | Wholesale & retail | 2022 |
| Totem Consultants Ltd | Information & communication | 2010 |
| Tots Coaching Limited | Arts & recreation | 2014 |
| Touch of Organisation Ltd | Administrative & support | 2024 |
| Town & Country Pubs (York) Limited | Hospitality | 2012 |
| Townsend Planning Consultants Limited | Professional & scientific | 2021 |
| Townside Developments Limited | Professional & scientific | 2000 |
| Toybox Private Nursery Limited | Other services | 2016 |
| Toyo INK Europe UK Ltd | Manufacturing | 2006 |
| TP Creative Consulting Limited | Extraterritorial | 2010 |
| TP Electrical Engineering Limited | Administrative & support | 2011 |
| TPH Autos Limited | Wholesale & retail | 2022 |
| TPI Taping and Jointing Limited | Administrative & support | 2017 |
| TPS Property Investment Ltd | Hospitality | 2025 |
| TPS Transport Consultants Limited | Professional & scientific | 2006 |
| TQ Environmental Limited | Manufacturing | 1990 |
| TQ Limited | Extraterritorial | 1998 |
| TQ Marine Limited | Extraterritorial | 2001 |
| TQ Sensors Limited | Extraterritorial | 2001 |
| TR & AS Developments Limited | Construction | 2023 |
| TR Electrical Yorkshire Ltd | Construction | 2026 |
| Tracy Blades Consultancy Ltd | Administrative & support | 2017 |
| Tracy Jackson Consultancy Ltd | Education | 2015 |
| Trade Export-Import Ltd | Water & waste | 2022 |
| Trade Mark Collections Ltd | Wholesale & retail | 1998 |
| Trafford Consultancy Services Ltd | Professional & scientific | 2023 |
| Train 2 Train Limited | Education | 2010 |
| Tranquil Property Services Management Ltd | Real estate | 2025 |
| Trans Europa Express Limited | Transport & logistics | 2008 |
| Trans-Plant (Yorkshire) Limited | Administrative & support | 2003 |
| Transform Architectural Visualisation Limited | Professional & scientific | 2004 |
| Transform AV Holdings Ltd | Financial services | 2021 |
| Transglobal Link Ltd | Wholesale & retail | 2025 |
| Transparent Manufacturing Ltd | Agriculture & fishing | 2016 |
| Transylvanian Bistro Limited | Hospitality | 2020 |
| Tranter Limited | Manufacturing | 1998 |
| Travellers Inn Ltd | Hospitality | 2013 |
| Travision Edge Ltd | Information & communication | 2025 |
| Traxler Property Ltd | Real estate | 2019 |
| Treacle Foods Ltd | Hospitality | 2024 |
| Treasure Trove Realty Ltd | Real estate | 2024 |