| Thirsk Bowmen | Arts & recreation | 2025 |
| Thirsk Car Services Ltd | Wholesale & retail | 2021 |
| Thirsk Chinese Restaurant Ltd | Hospitality | 2026 |
| Thirsk Decorating Centre Limited | Wholesale & retail | 1998 |
| Thirsk Fabrications Limited | Manufacturing | 1993 |
| Thirsk Farmers Auction Mart Company Limited | Wholesale & retail | 1907 |
| Thirsk Farriers Ltd | Other services | 2025 |
| Thirsk Fish & Chips Ltd | Hospitality | 2022 |
| Thirsk Hall Events Ltd | Arts & recreation | 2020 |
| Thirsk Hall Stud Limited | Hospitality | 2021 |
| Thirsk Leisure Ltd | Hospitality | 2017 |
| Thirsk Lodge Barns Limited | Hospitality | 2019 |
| Thirsk Mini Market 1 Limited | Wholesale & retail | 2026 |
| Thirsk Mini Market Ltd | Wholesale & retail | 2025 |
| Thirsk Parmesan House Ltd | Hospitality | 2023 |
| Thirsk Racecourse Limited | Arts & recreation | 1923 |
| Thirsk Tables Limited | Manufacturing | 2008 |
| Thirsk Tourist Information | Information & communication | 2011 |
| Thirsk Valeting Services Ltd | Administrative & support | 2019 |
| Thirsk Veterinary Centre Limited | Professional & scientific | 2020 |
| Thirsk WOK Limited | Hospitality | 2024 |
| Thomas Travill Ltd | Extraterritorial | 2024 |
| Thomas Wood Joinery Ltd | Construction | 2026 |
| Thompson Properties (Yorkshire) Limited | Real estate | 2021 |
| Thompson Steel Limited | Financial services | 2017 |
| Thorcalcasar Ltd | Other services | 2020 |
| Thormanby Energy Ltd | Agriculture & fishing | 2015 |
| Thornton Park Management Company Limited | Extraterritorial | 2012 |
| Thornton Park Properties Limited | Agriculture & fishing | 1988 |
| Thorpefield Properties Limited | Real estate | 2020 |
| Throstle Nest Enterprise Ltd | Hospitality | 2020 |
| Thunderpants UK Ltd | Wholesale & retail | 2019 |
| Timec 1444 Limited | Wholesale & retail | 2013 |
| Tiny Labs Ltd | Professional & scientific | 2015 |
| Tj's Hair Salon Ltd | Other services | 2013 |
| TLD Management Company Limited | Households | 2022 |
| TM Restaurant Ltd | Hospitality | 2025 |
| Toadally Limited | Arts & recreation | 2012 |
| Tolentino Group Ltd | Wholesale & retail | 2026 |
| Tolltrace Limited | Professional & scientific | 1980 |
| TOM Eaves Limited | Arts & recreation | 2006 |
| TOM Eaves Properties Limited | Real estate | 2022 |
| Tomrods Limited | Wholesale & retail | 1973 |
| Tomrods Trustees Limited | Administrative & support | 2021 |
| Toner People Ltd | Wholesale & retail | 1998 |
| Top Dog Services Ltd | Professional & scientific | 2026 |
| Topspec Equine Limited | Manufacturing | 1999 |
| Topspec Holdings Limited | Administrative & support | 2017 |
| Topspec Systems Limited | Administrative & support | 2018 |
| Topspec Topco Limited | Other services | 2022 |
| Town & Country Landscaping Ltd | Administrative & support | 2025 |
| Toy Plus Ltd | Wholesale & retail | 2023 |
| TPB3 Management Solutions Limited | Professional & scientific | 2018 |
| Trackfits Limited | Professional & scientific | 2023 |
| Transform Property Developments Ltd | Construction | 2016 |
| Tree Corner Ltd | Agriculture & fishing | 2024 |
| Tren Homes Limited | Hospitality | 2022 |
| Treske Holdings Limited | Professional & scientific | 2000 |
| Treske Limited | Manufacturing | 1973 |
| TRI Digital Ltd | Professional & scientific | 2018 |
| Trinity Nexus Limited | Health & social care | 2024 |
| Triple 7 Aviation Limited | Transport & logistics | 2019 |
| Triple 7 Marine Limited | Extraterritorial | 2020 |
| Tsalach International Limited | Manufacturing | 2026 |
| Tube Creation Holdings Limited | Financial services | 2023 |
| Tulip Healthcare Holdings Limited | Financial services | 2025 |
| Tulip Healthcare Limited | Water & waste | 2005 |
| Tundra Estates Ltd | Real estate | 2022 |
| TWC Draincare Limited | Water & waste | 2020 |
| TWC Facilities Ltd | Water & waste | 2009 |
| Twisted Automotive Limited | Wholesale & retail | 2023 |
| Twisted F1 Limited | Wholesale & retail | 2015 |
| Twisted Group Limited | Financial services | 2018 |
| Twisted Inc Limited | Professional & scientific | 2023 |
| Twisted Inc UK Limited | Wholesale & retail | 2007 |
| Twisted Marine Limited | Wholesale & retail | 2024 |
| Twisted Performance Limited | Extraterritorial | 2014 |
| Twisted Trustees Limited | Administrative & support | 2022 |
| Two VIZ Think Limited | Administrative & support | 2016 |
| UK Holiday Homes Limited | Wholesale & retail | 2014 |
| UK Steel Stock Limited | Wholesale & retail | 2021 |
| Ukcs Homewares Limited | Wholesale & retail | 2018 |
| Ukss Holdings Limited | Financial services | 2022 |
| Uktopthaitaste Ltd | Hospitality | 2022 |
| Unishower Distribution Limited | Administrative & support | 2007 |
| Unishower Limited | Wholesale & retail | 2006 |
| Unite Construction Limited | Construction | 2013 |
| Unite Facades Ltd | Construction | 2019 |
| Unite Property Holdings Ltd | Financial services | 2019 |
| United Scaffolders Ltd | Construction | 2017 |
| Urban Pumps and Drainage Ltd | Professional & scientific | 2025 |
| Validus Security Ltd | Administrative & support | 2023 |
| Vantagetransport Limited | Transport & logistics | 2025 |
| Vape Stox Magazine Limited | Information & communication | 2025 |
| Vencomatic Poultry UK Limited | Wholesale & retail | 2011 |
| Venture Yacht Crew Ltd | Administrative & support | 2024 |
| Versawork Ltd | Information & communication | 2024 |
| Vetspec Limited | Administrative & support | 2017 |
| VFM Logistics Limited | Professional & scientific | 2006 |
| Vikin Builders Ltd | Construction | 2025 |