| Told Property Investments Limited | Real estate | 2023 |
| Tolson Consultancy Limited | Professional & scientific | 2016 |
| Tolu Sky Travel Ltd | Administrative & support | 2025 |
| TOM Gabbitas Truck Hire Ltd | Administrative & support | 2024 |
| TOM Hall (Barnsley) Limited | Wholesale & retail | 2006 |
| TOM Hirst Limited | Professional & scientific | 2012 |
| TOM LEE Associates Limited | Real estate | 1999 |
| TOM Rhys Jones Ltd | Other services | 2018 |
| Tomasz Kozlowski Ltd | Transport & logistics | 2013 |
| Tomatonetwork Ltd | Information & communication | 2009 |
| Tommy Transport Services Ltd | Transport & logistics | 2026 |
| Tommypearce Ltd | Information & communication | 2018 |
| Tonge & Robinson Lettings Ltd | Real estate | 2025 |
| Tonge & Robinson Property and Construction Ltd | Construction | 2019 |
| Tonnik Interiors Limited | Wholesale & retail | 2016 |
| Toolpoint Solutions Limited | Wholesale & retail | 2025 |
| Top Camping UK Ltd | Arts & recreation | 2024 |
| Top CUT (Barnsley) Ltd | Other services | 2025 |
| Top CUT Barber (Robert ST) Ltd | Other services | 2017 |
| Top Cuts Darfield Limited | Other services | 2025 |
| Top END Plasterers Limited | Construction | 2023 |
| Top Fade Barber T/A Aruis Ltd | Other services | 2022 |
| Top Kurdish Hairstyle Limited | Other services | 2025 |
| Top Lock Auto Ltd | Wholesale & retail | 2025 |
| Top Lock Property Ltd | Real estate | 2025 |
| Top Lock Yorkshire Ltd | Manufacturing | 2024 |
| Top Nails Ptla Ltd | Other services | 2017 |
| Top Shelf Barnsley Ltd | Wholesale & retail | 2026 |
| Top Sprint Ltd | Transport & logistics | 2023 |
| Topp Property Ltd | Real estate | 2015 |
| Topplayer Limited | Professional & scientific | 1998 |
| Toprock Training Limited | Mining & quarrying | 2017 |
| Topspot W Ltd | Arts & recreation | 2026 |
| Torovali Ltd | Wholesale & retail | 2021 |
| Torque Partnership Ltd | Information & communication | 2020 |
| Total Choice Ltd | Wholesale & retail | 2026 |
| Total Door Tech Ltd | Professional & scientific | 2025 |
| Total Energy Assessors Ltd | Construction | 2025 |
| Total Mobility Limited | Wholesale & retail | 2016 |
| Total Roofing & Repairs Limited | Construction | 2025 |
| Total Roofing and Home Improvements Limited | Construction | 2024 |
| Total Safety (UK) Limited | Administrative & support | 2010 |
| Total Sporting Solutions Limited | Arts & recreation | 2006 |
| Total Trade Sales Ltd | Wholesale & retail | 2026 |
| Total Tyre Services Jlcl Limited | Wholesale & retail | 2014 |
| Totally Inspired Limited | Wholesale & retail | 2012 |
| Totasol Limited | Real estate | 2024 |
| TOTS2TEENS Daycare Ltd | Health & social care | 2017 |
| Touch Media Solutions Limited | Information & communication | 2003 |
| Touchwood Insurance Brokers Limited | Financial services | 2015 |
| Tour 365 Limited | Extraterritorial | 2021 |
| Tower CS UK Ltd | Construction | 2014 |
| Town Holdings Limited | Real estate | 2022 |
| Towngate Homes Limited | Professional & scientific | 1996 |
| Townsend Fish & Chips Limited | Wholesale & retail | 2003 |
| Townsend Theatre Productions CIC | Arts & recreation | 2018 |
| TP Fairfield Ltd | Financial services | 2019 |
| Tpdh Ltd | Wholesale & retail | 2025 |
| TR3A Estates Limited | Construction | 2013 |
| Tracey Jane Properties Limited | Real estate | 2022 |
| Trade Radiators Limited | Wholesale & retail | 2014 |
| Trademark Yorkshire Limited | Construction | 2022 |
| Tradeprojex Ltd | Wholesale & retail | 2022 |
| Tradesafe Ltd | Financial services | 2026 |
| Tradesboard Limited | Extraterritorial | 2025 |
| Trafford Gardens Limited | Administrative & support | 2016 |
| Trail Fitness Ltd | Information & communication | 2019 |
| Training & Event Medical Services Limited | Health & social care | 2025 |
| Training Cafe Limited | Education | 2009 |
| Tranquil Connection Ltd | Administrative & support | 2026 |
| Transcending Talent Limited | Administrative & support | 2024 |
| Transform Fitness Barnsley Limited | Arts & recreation | 2021 |
| Transilvania Shop Limited | Wholesale & retail | 2019 |
| Transmap UK Limited | Transport & logistics | 2011 |
| Transmit Creative Limited | Professional & scientific | 2004 |
| Transmovy Ltd | Professional & scientific | 2019 |
| Transpromanlogistic Ltd | Transport & logistics | 2019 |
| Trav Limited | Professional & scientific | 2017 |
| Travelgreen Limited | Transport & logistics | 1995 |
| Travellers Moon Limited | Hospitality | 2022 |
| Travelscene Coaches Limited | Professional & scientific | 2009 |
| Travelscene Holidays Limited | Professional & scientific | 2009 |
| Travelscene Limited | Extraterritorial | 2007 |
| Treat Your Feet (Yorkshire) Ltd | Other services | 2021 |
| Tredis Close Management Limited | Households | 2016 |
| Tredx Holdings Ltd | Wholesale & retail | 2023 |
| Treetops Management Company (South Kirkby) Ltd | Real estate | 2018 |
| Trenchless Group Ltd | Financial services | 2018 |
| Trenchless Sales UK Limited | Manufacturing | 2015 |
| Trenchless Solutions Ltd | Construction | 2009 |
| Trend Joinery and Building Developments Ltd | Construction | 2020 |
| Trend Motor Services Limited | Wholesale & retail | 2004 |
| Trevor Billard and Company Limited | Professional & scientific | 2006 |
| Trey Williams Ltd | Real estate | 2025 |
| Tri-Beds Ltd | Wholesale & retail | 2018 |
| Tri-Flooring Ltd | Wholesale & retail | 2016 |
| Tri-Rugs Ltd | Wholesale & retail | 2021 |
| Tribus Hospitality Ltd | Hospitality | 2023 |
| Trident Mechanical Group Ltd | Construction | 2024 |
| Tridentcoaching Ltd | Arts & recreation | 2023 |