| Therapy Stars Limited | Health & social care | 2018 |
| Therapy With ROB Ltd | Information & communication | 2023 |
| Thermaliner Insulations Limited | Construction | 1984 |
| Think 3D Limited | Manufacturing | 2024 |
| Think Afresh Ltd | Manufacturing | 2026 |
| Think Big Partners Ltd | Professional & scientific | 2020 |
| Thirsk Farms Limited | Real estate | 2023 |
| This IS the Way Cleaning Ltd | Administrative & support | 2024 |
| This IS Wrexham C.I.C. | Professional & scientific | 2025 |
| This Project Limited | Arts & recreation | 2025 |
| Thistlewood Homes Ltd | Real estate | 2024 |
| Thomas Catering Services Limited | Hospitality | 2004 |
| Thomas Computer Consultants Limited | Information & communication | 1985 |
| Thomas Engineering Projects Ltd | Professional & scientific | 2025 |
| Thomas Transport (Wrexham) Limited | Transport & logistics | 1939 |
| Thompson Caravans Ltd | Wholesale & retail | 2015 |
| Thompson Coating Solutions Limited | Manufacturing | 2016 |
| Thompson Developments (Wales) Ltd | Construction | 2004 |
| Thoughtspace Associates Ltd | Professional & scientific | 2010 |
| Thox Limited | Wholesale & retail | 2024 |
| Threadgold Cloud Services Ltd | Other services | 2021 |
| Three Roots Holdings Limited | Wholesale & retail | 2026 |
| Thunderman Designs Ltd | Manufacturing | 2017 |
| Thynk Limited | Wholesale & retail | 2025 |
| TIA & Taty Ltd | Health & social care | 2019 |
| Tidy House Tidy Mind Limited | Administrative & support | 2026 |
| Tilston Training Limited | Education | 2018 |
| TIM Burnett Ltd | Information & communication | 2022 |
| Timber Art Design UK Ltd | Manufacturing | 2018 |
| Timber Direct Limited | Wholesale & retail | 1986 |
| Timber Sustainable Homes Ltd | Construction | 2013 |
| Time for Marketing Ltd | Professional & scientific | 2020 |
| Timeless Beauty Makeup and Aesthetics Ltd | Other services | 2020 |
| Timeless Furniture UK Ltd | Wholesale & retail | 2022 |
| Timmotech Limited | Construction | 2007 |
| TIP Top Musicals Limited | Arts & recreation | 2015 |
| Tired Mums Coffee Limited | Wholesale & retail | 2022 |
| TJG Electrical Services Ltd | Construction | 2022 |
| TJG Hub Ltd | Manufacturing | 2026 |
| TJS JET Pressure Washing Services NW Ltd | Administrative & support | 2025 |
| TK9 Pet Supplies Ltd | Wholesale & retail | 2023 |
| TKT Creations Ltd | Wholesale & retail | 2025 |
| TLC Executive Services Limited | Professional & scientific | 2025 |
| TLC Holdings Group Ltd | Real estate | 2024 |
| TLR Accountancy and Bookkeeping Services Ltd | Professional & scientific | 2020 |
| TLR Property Group Ltd | Real estate | 2025 |
| TMS Care Limited | Health & social care | 2021 |
| TNT North West Properties Limited | Real estate | 2025 |
| TO the Stage Productions Limited | Arts & recreation | 2024 |
| Toast Cafe and Deli Ltd | Wholesale & retail | 2025 |
| Toby ETC. Ltd | Professional & scientific | 2023 |
| Toby Garage Limited | Wholesale & retail | 2016 |
| Toby MAC of ALL Trades Ltd | Other services | 2025 |
| Togemba Ltd | Extraterritorial | 2020 |
| TOM New Construction Ltd | Construction | 2023 |
| TOM Wrigley Performance Limited | Arts & recreation | 2017 |
| Tomos Homes Limited | Construction | 2021 |
| Tomos Properties Limited | Real estate | 2000 |
| Toothopia Ltd | Health & social care | 2018 |
| Top CUT Barber Wrexam Ltd | Other services | 2023 |
| Top Line Qwerty Ltd | Information & communication | 2025 |
| Top Mark Uniforms Ltd | Manufacturing | 2016 |
| Top Motor Sourcing Ltd | Wholesale & retail | 2024 |
| Top VIT Limited | Wholesale & retail | 2024 |
| Topliffe Consulting Limited | Professional & scientific | 2021 |
| Torriad Farms Limited | Agriculture & fishing | 2020 |
| Total Boilers Limited | Construction | 2011 |
| Total Brand Management Ltd | Wholesale & retail | 2012 |
| Total Groundscapes Ltd | Administrative & support | 2024 |
| Total Heat Solutions Limited | Construction | 2017 |
| Total Heating & Plumbing Supplies Limited | Wholesale & retail | 2020 |
| Total Property Rentals Limited | Real estate | 2018 |
| Totalway Ltd | Financial services | 2025 |
| Touchstone Commercial Finance Limited | Financial services | 2008 |
| Town & Country (NW) Limited | Real estate | 2014 |
| Town & Country Franchise Limited | Real estate | 2017 |
| Town & Country Property Auctions Limited | Real estate | 2022 |
| Town & Country Property Services Pro Auction Limited | Real estate | 2019 |
| Town and Country Property GT Ltd | Extraterritorial | 2026 |
| TP Newco 2024 Limited | Financial services | 2024 |
| TPG Trading Limited | Real estate | 2020 |
| Traction Automotive & Commercial Ltd | Wholesale & retail | 2024 |
| Trade Effluent Services Limited | Water & waste | 1991 |
| Trade Seasonings Ltd | Manufacturing | 2026 |
| Tradehelp Ltd | Information & communication | 1999 |
| Trading by Hexagon Limited | Real estate | 2023 |
| Trafalgar Chemicals Limited | Professional & scientific | 1986 |
| Trailwalk Limited | Real estate | 2000 |
| Transform Auto Clinic Limited | Wholesale & retail | 2007 |
| Transform Global Installers Ltd | Administrative & support | 2021 |
| Transformi Consulting Services Ltd | Information & communication | 2022 |
| Trauma Assist International Ltd | Health & social care | 2024 |
| Traverse Leadership Consulting (TLC) Ltd | Professional & scientific | 2025 |
| Tree Solutions Limited | Agriculture & fishing | 2002 |
| Treehogs Limited | Administrative & support | 2016 |
| Treetekk Ltd | Agriculture & fishing | 2018 |
| Treharne Web Solutions Ltd | Information & communication | 2024 |
| Tremart Ltd | Manufacturing | 2023 |
| Tremolo Holdings Ltd | Financial services | 2022 |
| Trench Lock Service Station Ltd | Wholesale & retail | 2020 |