| Tristimulus Limited | Professional & scientific | 2022 |
| Triton Construction Group Limited | Professional & scientific | 2009 |
| Triton Construction Trustees Limited | Professional & scientific | 2020 |
| Triumphant Revivals Limited | Wholesale & retail | 2021 |
| Triwple a Ltd | Administrative & support | 2024 |
| Trojan Bathrooms Limited | Manufacturing | 2023 |
| Trojan Baths Limited | Administrative & support | 1979 |
| Trojan Electronics 2018 Limited | Wholesale & retail | 2018 |
| Tron Industries Ltd | Information & communication | 2015 |
| Tropical Delicacies Ltd | Hospitality | 2026 |
| Trosax Ltd | Real estate | 2023 |
| Trowel Lettings Ltd | Real estate | 2024 |
| TRS Electrical Ltd | Construction | 2016 |
| Truckline Services Limited | Manufacturing | 2002 |
| Truckline Services North Ltd | Manufacturing | 2022 |
| True Choice Utilities Limited | Energy | 2018 |
| True Frame (Yorkshire) Limited | Construction | 2025 |
| True Grit (Yorkshire) Limited | Administrative & support | 2014 |
| True Sight Ltd | Wholesale & retail | 2025 |
| True Travel Journeys Limited | Administrative & support | 2024 |
| Truefix Plumbing & Electrical Services Limited | Construction | 2025 |
| Truetopia Ltd | Wholesale & retail | 2012 |
| Truhood Ltd | Wholesale & retail | 2024 |
| Truly Local Advertising Limited | Professional & scientific | 2008 |
| Trusted UK Suppliers Ltd | Wholesale & retail | 2024 |
| Truvida Ltd | Wholesale & retail | 2025 |
| TS (Huddersfield) Limited | Wholesale & retail | 2012 |
| TS (Humber) Limited | Wholesale & retail | 2012 |
| TS Construction Yorks Ltd | Construction | 2011 |
| TSO Training Limited | Extraterritorial | 2016 |
| TSV Property Services Ltd | Real estate | 2024 |
| TT Pony Ltd | Agriculture & fishing | 2010 |
| Ttcc Ltd | Education | 2022 |
| Ttfadez Ltd | Other services | 2023 |
| TTS Sales Ltd | Wholesale & retail | 2022 |
| Ttsuk Ltd | Wholesale & retail | 2008 |
| Tubbymate Ltd | Wholesale & retail | 2018 |
| Tubularwelds Ltd | Manufacturing | 2018 |
| Tuition Time Hub Limited | Other services | 2025 |
| Tuition Time Huddersfield Limited | Other services | 2015 |
| Tulip HR Limited | Administrative & support | 2014 |
| Tumble Tots Huddersfield LLP | | 2025 |
| Tuned to R.I.S.K. Ltd | Professional & scientific | 2020 |
| Tunnel Travel Limited | Transport & logistics | 2022 |
| Turbo Panda Ltd | Wholesale & retail | 2026 |
| Turn Group Ltd. | Professional & scientific | 2015 |
| Turn UP the Heath Limited | Construction | 2026 |
| Turner & Scott Developments Ltd | Construction | 2024 |
| Turner Agencies Limited | Administrative & support | 2026 |
| Turner Creations Ltd | Arts & recreation | 2009 |
| Turner Key Developments Ltd | Construction | 2019 |
| Turners Building and Plumbing Ltd | Construction | 2016 |
| Turners of Rishworth Ltd | Wholesale & retail | 2025 |
| Turnways Limited | Other services | 2025 |
| Turnways Therapies Limited | Health & social care | 2021 |
| TUTORS4U Limited | Education | 2024 |
| Tutti Interiors Limited | Other services | 2018 |
| Tuttis Takeaway Ltd | Hospitality | 2026 |
| TUU Holdings Ltd | Real estate | 2006 |
| TVK Holdings Limited | Financial services | 2023 |
| TVK Property Limited | Real estate | 2024 |
| Twenty SIX Point 2 Limited | Professional & scientific | 2017 |
| TWGROUP789 Limited | Hospitality | 2024 |
| Twicenorth Limited | Real estate | 2019 |
| Twilite Capital Ltd | Financial services | 2019 |
| Twilite Corporate Services Limited | Public administration | 2024 |
| Twisted Fate Publishing Ltd | Information & communication | 2020 |
| Twisted Ideas Ltd | Arts & recreation | 2010 |
| Twisted Mojito Cocktail and Bar Hire Ltd | Hospitality | 2019 |
| Two Facilities Management Limited | Professional & scientific | 2015 |
| Two Gates Design Ltd | Construction | 2024 |
| Twofold Fitness Ltd | Education | 2025 |
| Ty's Autocare Ltd | Wholesale & retail | 2025 |
| Tyersal Pallets Limited | Administrative & support | 2003 |
| Tyler's Roofing Services Ltd | Construction | 2024 |
| TYR Enterprises Ltd | Wholesale & retail | 2022 |
| Tyre Vortex Limited | Other services | 2025 |
| Tyres 2 Go Limited | Wholesale & retail | 2007 |
| Tyres Rollfix Ltd | Manufacturing | 2026 |
| Tyreseal World Limited | Administrative & support | 2017 |
| Tyro Studios Yorkshire CIC | Arts & recreation | 2025 |
| U & G Murtaza Services Limited | Health & social care | 2012 |
| U Energy (Yorkshire) Limited | Construction | 2011 |
| U Energy Group Limited | Financial services | 2021 |
| U Power Group Limited | Energy | 2024 |
| U Power Limited | Energy | 2019 |
| U&A Products Ltd | Wholesale & retail | 2021 |
| U.F Apartments Ltd | Real estate | 2022 |
| U.K. Property Rentals Limited | Real estate | 2007 |
| Uber Construction Limited | Construction | 2011 |
| Ubhi Lettings Ltd | Real estate | 2024 |
| Uche Daniel(Ud) Construction Development Limited | Financial services | 2025 |
| Ucover Limited | Real estate | 2010 |
| UDM Ltd | Professional & scientific | 2025 |
| UHU Enterprises Limited | Wholesale & retail | 2016 |
| UIM Properties Limited | Professional & scientific | 1985 |
| UIQ Ltd | Wholesale & retail | 2022 |
| Uirtus Construction Ltd | Construction | 2021 |
| UJU Commerce Limited | Wholesale & retail | 2004 |
| UK Brassware Ltd | Wholesale & retail | 2019 |