| THE Window Shop (Yorkshire) Limited | Manufacturing | 2011 |
| THE Wingman's Fried Chicken Ltd | Hospitality | 2023 |
| THE Wise Womb Woman Ltd | Health & social care | 2026 |
| THE Write Support Limited | Professional & scientific | 2024 |
| THE Yorkshire Advisory Group Limited | Professional & scientific | 2023 |
| THE Yorkshire Big City Co (MB) Limited | Construction | 2020 |
| THE Yorkshire Big City Co (Rhodesia) Limited | Real estate | 2017 |
| THE Yorkshire Big City Co Limited | Construction | 2016 |
| THE Yorkshire Developers Limited | Construction | 2022 |
| THE Yorkshire Group of 16MM Narrow Gauge Modellers Limited | Other services | 2007 |
| Theaker Farming Ltd | Agriculture & fishing | 2024 |
| Themarketinggroup Limited | Information & communication | 2025 |
| Therapy Remedy Ltd | Health & social care | 2026 |
| Thermal Window & Conservatory Roof Systems Limited | Manufacturing | 2006 |
| Thermotec Group Ltd | Construction | 2023 |
| Thewheelnutman Ltd | Manufacturing | 2015 |
| Think Barnsley Ltd | Education | 2012 |
| Think Time Limited | Information & communication | 2021 |
| Thinkwise Construction Consultants Ltd | Professional & scientific | 2025 |
| Thio Ltd | Information & communication | 2014 |
| Third Sector Support Solutions Ltd | Professional & scientific | 2016 |
| Thirst AID Bar Hire Ltd | Hospitality | 2022 |
| Thirteen Investment Group Limited | Financial services | 2023 |
| This Works Ltd | Other services | 2011 |
| Thismanner Limited | Information & communication | 2011 |
| Thomas a. Ashton Limited | Professional & scientific | 1956 |
| Thomas James Downes Ltd | Extraterritorial | 2024 |
| Thomas’ Transport & Driver Services Ltd | Administrative & support | 2024 |
| Thorndale Properties Yorkshire Ltd | Real estate | 2017 |
| Thornes Lane Garage Limited | Wholesale & retail | 2010 |
| Thornton Court Properties (Asset) Limited | Real estate | 1997 |
| Thornton Rose & Co Limited | Professional & scientific | 2021 |
| Thoughtcube Limited | Information & communication | 2009 |
| Thrale Consulting Ltd | Information & communication | 2010 |
| Three Bhai Spice Ltd | Hospitality | 2026 |
| Three Strands Homes LLP | | 2018 |
| Thrive Solo Ltd | Education | 2024 |
| Thrive Space Yorkshire Ltd | Professional & scientific | 2022 |
| Throstle Nest Saddlery Limited | Manufacturing | 2004 |
| Throughput Engineering Ltd | Professional & scientific | 2026 |
| THW Joinery & Carpentry Ltd | Construction | 2026 |
| THY Grace Medical Staffing Ltd | Health & social care | 2022 |
| TIA Delivery Ltd | Transport & logistics | 2023 |
| Ticle Haulage Limited | Transport & logistics | 2017 |
| Tidal Paws Limited | Agriculture & fishing | 2017 |
| TIG Events Ltd | Arts & recreation | 2022 |
| Tiger Investment Group Limited | Financial services | 2024 |
| TIL Corporation Limited | Professional & scientific | 2012 |
| TIM Smith Construction Management Limited | Construction | 2014 |
| Timb Limited | Information & communication | 2016 |
| Time Business Services Limited | Professional & scientific | 2001 |
| Time for With- NLE Ltd | Other services | 2024 |
| Time in Time OUT Media Limited | Professional & scientific | 2009 |
| Time Isn'T UP UK C.I.C. | Health & social care | 2024 |
| Timebox Heritage LLP | | 2018 |
| Timeless Cabinetry Ltd | Manufacturing | 2022 |
| Timepiece Epicurean Ltd | Other services | 2023 |
| Timlogistix Limited | Transport & logistics | 2023 |
| Timms & Holmes Consulting Ltd | Professional & scientific | 2020 |
| Tina's Cafe and GIN Bar Limited | Hospitality | 2018 |
| Tinomir Ltd | Wholesale & retail | 2025 |
| Tipsy Toad Events Company Ltd | Hospitality | 2026 |
| Titan Risk Ltd | Professional & scientific | 2013 |
| Titan Upvc Recovery Ltd | Water & waste | 2026 |
| Titan Voyage Limited | Information & communication | 2011 |
| Tivoli Services Ltd | Manufacturing | 2025 |
| TJ Utilities Limited | Construction | 2026 |
| TJ Yorkshire Limited | Administrative & support | 2019 |
| Tj's Travel Limited | Transport & logistics | 2013 |
| TJB Consulting Partners Ltd | Professional & scientific | 2025 |
| TJH Plant Ltd | Construction | 2024 |
| TJH Properties Ltd | Real estate | 2025 |
| Tjrp Ltd | Wholesale & retail | 2021 |
| TJS Compliance Limited | Other services | 2018 |
| TJT Construction Limited | Construction | 2023 |
| TKL Group (Holdings) Ltd | Administrative & support | 2020 |
| TL Electrical Contractors Ltd | Construction | 2021 |
| TLB Studio Ltd | Information & communication | 2022 |
| TLC Care Management Ltd | Health & social care | 2016 |
| TLC Property Solutions Ltd | Real estate | 2011 |
| TLH Utilities Ltd | Construction | 2023 |
| TLS Lining Solutions Ltd | Construction | 2019 |
| TMC & E Services Ltd | Information & communication | 2024 |
| TMR Williams Properties Limited | Real estate | 2018 |
| TMT Fit OUT Ltd | Construction | 2024 |
| TMT Site Solutions Ltd | Construction | 2025 |
| TMU Apparel Limited | Wholesale & retail | 2021 |
| TN28 Company Ltd | Wholesale & retail | 2021 |
| TN88 Company Ltd | Information & communication | 2023 |
| TNR Skips Ltd | Water & waste | 2023 |
| TNS Engineering Ltd | Professional & scientific | 2019 |
| TO BE Ltd | Health & social care | 2025 |
| Toadmondu Games Limited | Information & communication | 2024 |
| Tobias and Company Limited | Real estate | 2020 |
| TOC Barnsley Ltd | Hospitality | 2018 |
| Tocar Logistic Ltd | Construction | 2018 |
| Today’S Local Wombwell Ltd | Wholesale & retail | 2025 |
| Todel Novida Health Solutions Ltd | Wholesale & retail | 2025 |
| Toffs Sliding Doors Ltd | Manufacturing | 2015 |
| Toft & Keld Limited | Construction | 2022 |