| THE Phoney Box Co. Ltd. | Manufacturing | 2006 |
| THE Platt Partnership Limited | Professional & scientific | 2019 |
| THE Point (Talacre) Limited | Hospitality | 2016 |
| THE Rising Sun Management Company Limited | Extraterritorial | 2008 |
| THE Royal Oak Caerwys Ltd | Hospitality | 2011 |
| THE Secret Hives Ltd | Agriculture & fishing | 2025 |
| THE Tecdesk (IT) Limited | Information & communication | 2025 |
| THE UK Concave Company Ltd | Professional & scientific | 2018 |
| THE Walnut Box Ltd | Hospitality | 2019 |
| Theatr Clwyd Enterprises Ltd | Arts & recreation | 2020 |
| Theatr Clwyd Music Trust Ltd | Education | 2020 |
| Theatr Clwyd Productions Ltd | Arts & recreation | 2015 |
| Theatr Clwyd Trust Ltd | Arts & recreation | 2020 |
| Thermabove Limited | Construction | 2021 |
| Thermofyl Ltd | Construction | 2017 |
| Third Avenue Sound Limited | Arts & recreation | 2016 |
| Thomas Developments Limited | Professional & scientific | 2003 |
| Thoroworks Ltd | Manufacturing | 2026 |
| Three Clicks Digital Solutions Ltd | Information & communication | 2025 |
| Tibberton Capital Limited | Professional & scientific | 2011 |
| Tidy Electrics Ltd | Construction | 2022 |
| Tiger TIM Products Limited | Manufacturing | 1978 |
| Timeline Junkies Ltd | Information & communication | 2017 |
| TLG Management Ltd | Real estate | 2017 |
| Top Trenz UK Ltd | Information & communication | 2008 |
| Total Equine Care Ltd | Agriculture & fishing | 2023 |
| Tower Architectural Glazing Ltd | Construction | 2025 |
| Tower Forge Ltd | Manufacturing | 2015 |
| Tower Home Group Ltd | Construction | 2025 |
| Tower Windows Limited | Construction | 1991 |
| Towergate Home & Garden Ltd | Wholesale & retail | 2015 |
| TP Transcription Limited | Administrative & support | 2003 |
| TP Translations Limited | Professional & scientific | 2023 |
| TR Recruitment Services Ltd | Administrative & support | 2024 |
| Track Groundworks Ltd | Construction | 2022 |
| Tracxion Limited | Information & communication | 2007 |
| Traditional Skills Limited | Education | 2024 |
| Tramar (Engineering) Co. Limited | Manufacturing | 1978 |
| Travers Properties Limited | Real estate | 2024 |
| Trecot Holdings Limited | Real estate | 2020 |
| Trecot Limited | Construction | 2014 |
| Tree Tops and Train Tracks Ltd | Agriculture & fishing | 2019 |
| Trek Recruitment Ltd | Administrative & support | 2024 |
| Treuddyn Express Ltd | Wholesale & retail | 2020 |
| Trilad Limited | Other services | 2007 |
| Trussell, Suspended Ceilings, Partitions & Drylining Limited | Construction | 2012 |
| Trust Impact Ltd | Professional & scientific | 2019 |
| Trusted Companions Ltd | Health & social care | 2025 |
| Truwood Furniture Limited | Manufacturing | 1984 |
| TS Resins Limited | Manufacturing | 2012 |
| Turnberry Consultancy Services Limited | Real estate | 2012 |
| Tursiops Properties Limited | Construction | 2015 |
| TW Jones Steel Frame Buildings Ltd | Construction | 2015 |
| Twenty Sixteen (2016) Pharma Limited | Professional & scientific | 2014 |
| TY Gwyn Pet Services Ltd | Wholesale & retail | 2024 |
| TY Gwyn Pets Ltd | Other services | 2022 |
| TYN Llan Properties LLP | | 2008 |
| TYN YR YNN Farm Limited | Agriculture & fishing | 2015 |
| Type on Data Ltd | Information & communication | 2022 |
| UK Ceramics & Stone Limited | Construction | 2009 |
| UK Ceramics Limited | Real estate | 2002 |
| UKI Sales Ltd | Real estate | 2023 |
| Ultiathletic Ltd | Arts & recreation | 2024 |
| Ultimate Tinting Limited | Extraterritorial | 2010 |
| Ultimate Window Film Limited | Administrative & support | 2010 |
| Under Development Limited | Professional & scientific | 2016 |
| Undercover Lingerie Limited | Wholesale & retail | 2007 |
| Universal of Wrexham Limited | Real estate | 2003 |
| UQ Web Design Ltd | Information & communication | 2009 |
| Usher & Read House Management Company Limited | Real estate | 2006 |
| V Roberts Limited | Professional & scientific | 2016 |
| Valeway Limited | Extraterritorial | 2000 |
| Van Calker Holdings Ltd | Wholesale & retail | 2017 |
| Van Force One Limited | Transport & logistics | 2024 |
| Vantage Cresco Limited | Financial services | 2025 |
| Vaughan Edmunds Properties Limited | Real estate | 2025 |
| VBA Media Group Limited | Wholesale & retail | 2019 |
| VD Enterprises Ltd | Financial services | 2017 |
| Venture Travel Group Ltd | Administrative & support | 2017 |
| Viking Property Services Limited | Real estate | 2019 |
| Virtus ET Honos Ltd | Professional & scientific | 2025 |
| Visa PA Ltd | Professional & scientific | 2023 |
| VKZ Transfers Ltd | Transport & logistics | 2024 |
| Vocational Rehabilitation Services Ltd | Administrative & support | 2025 |
| VTG Investments Ltd | Financial services | 2021 |
| W & S Property & Land Limited | Real estate | 2019 |
| W E Blackwell Limited | Construction | 2000 |
| W2H2 LLP | | 2021 |
| Waffle Box Events Ltd | Hospitality | 2024 |
| Walder Properties Ltd | Real estate | 2017 |
| Wander the Waves Ltd | Transport & logistics | 2018 |
| Warburton Properties Limited | Real estate | 2024 |
| Waring Law Ltd | Professional & scientific | 2012 |
| Warmwell Properties Limited | Real estate | 2001 |
| Watchdog IT Support Limited | Information & communication | 2018 |
| Watson ORD Renewables Limited | Professional & scientific | 2012 |
| Waudby Haulage Limited | Transport & logistics | 2001 |
| Way 2 Sharp Ltd | Wholesale & retail | 2014 |
| WB Electrical NW Limited | Construction | 2022 |
| Weetwood Holdings Limited | Financial services | 2026 |