| Swetenham Properties Limited | Real estate | 2016 |
| Sylvia Chong SY Limited | Other services | 2020 |
| Synergy Professions Limited | Extraterritorial | 2015 |
| T & P Building Solutions Ltd | Construction | 2020 |
| T L C Nursing and Homecare Plus Limited | Health & social care | 2006 |
| T Williams Home Improvements Ltd | Other services | 2019 |
| T.L.D Brickworks Ltd | Construction | 2023 |
| Talking Therapy Hub Ltd | Health & social care | 2023 |
| Tamah Limited | Financial services | 2025 |
| Tandem Developments Limited | Administrative & support | 2017 |
| Tandem Energy Limited | Other services | 2012 |
| Tandem Farming Limited | Agriculture & fishing | 2023 |
| Tandem Holdings Limited | Financial services | 2021 |
| Tandem Industrial Limited | Construction | 2020 |
| Tandem Investments Limited | Real estate | 2022 |
| Tasc Engineering Services Ltd | Professional & scientific | 2024 |
| Team Gronant Community Interest Company | Households | 2025 |
| THD Limited | Health & social care | 2010 |
| THE Aesthetics Skin and Laser Clinic Herefordshire Ltd | Other services | 2023 |
| THE Agile Wellington Limited | Professional & scientific | 2013 |
| THE Bakeking Limited | Wholesale & retail | 2016 |
| THE Barrow Alms Limited | Hospitality | 2018 |
| THE Carbon House Services Ltd | Professional & scientific | 2025 |
| THE Denbighshire Decking Company Ltd | Administrative & support | 2017 |
| THE Garden Vintage Ltd | Wholesale & retail | 2024 |
| THE Garment Spa Limited | Professional & scientific | 2013 |
| THE George (Rhyl) Ltd | Hospitality | 2016 |
| THE Ghosals Limited | Other services | 2013 |
| THE Gwydyr Hotel Limited | Hospitality | 2019 |
| THE Hummingbird Project NW CIC | Health & social care | 2023 |
| THE Kaima Group Ltd | Health & social care | 2025 |
| THE KIT Lover Ltd | Wholesale & retail | 2021 |
| THE Langley Spa Limited | Other services | 2010 |
| THE Lilly Restaurant With Rooms Ltd | Hospitality | 2024 |
| THE Little Kitchen (Cymru) Limited | Hospitality | 2014 |
| THE Outreach Organisation Ltd | Other services | 1988 |
| THE Prop Gallery Limited | Administrative & support | 2011 |
| THE Rustic Crust Pizza Ltd | Hospitality | 2025 |
| THE Salon (Rhyl) Ltd | Other services | 2012 |
| THE Smallest House Limited | Arts & recreation | 2015 |
| THE South Cheshire Breast Service Ltd | Professional & scientific | 2016 |
| THE Stables Property Letting Limited | Real estate | 2017 |
| THE Waterfront Phase II (Rhos on Sea) Management Company Limited | Households | 2008 |
| THE Wings Club Ltd | Hospitality | 2012 |
| Thefdf | Health & social care | 2016 |
| Thermal-Systems.Co.Uk Limited | Manufacturing | 2009 |
| Thomas Trading Services (TTS) Ltd | Construction | 2024 |
| Thompson Contractors Limited | Construction | 2015 |
| Thornton Hough Glamping Lodges Ltd | Hospitality | 2024 |
| Tiago Faleiro Ltd | Other services | 2018 |
| TIC247 Limited | Construction | 2022 |
| Tickety BOO Developments Ltd | Construction | 2016 |
| TIL SPV 1 Limited | Real estate | 2023 |
| TIL SPV 10 Limited | Real estate | 2026 |
| TIL SPV 2 Limited | Real estate | 2023 |
| TIL SPV 3 Limited | Real estate | 2024 |
| TIL SPV 4 Limited | Real estate | 2025 |
| TIL SPV 5 Limited | Real estate | 2025 |
| TIL SPV 6 Limited | Real estate | 2025 |
| TIL SPV 8 Limited | Real estate | 2025 |
| TIL SPV 9 Limited | Real estate | 2026 |
| Tilston Precision Engineering Ltd | Other services | 2020 |
| Tina Morse Agencies Limited | Wholesale & retail | 2015 |
| TJB Leisure Ltd | Arts & recreation | 2026 |
| TLC Property Lettings Ltd | Households | 2020 |
| TM Metalshop Ltd | Other services | 2019 |
| TOM Taylor Catering Ltd | Other services | 2018 |
| Tomi Williams CYF | Construction | 2024 |
| Tommy's Education Centre Ltd | Education | 2014 |
| Tommy's Enterprise Ltd | Financial services | 2014 |
| Tommy's Hair Company One Limited | Other services | 2002 |
| Tommy's Hair Company Three Limited | Other services | 2008 |
| Tommy's Hair Company Two Limited | Other services | 2006 |
| Tonto Commercial Limited | Wholesale & retail | 2013 |
| Top Tier Bikes Ltd | Wholesale & retail | 2024 |
| Total Transmission Solutions Limited | Construction | 2016 |
| Tracy Thomas Safety Consultancy CYF. | Professional & scientific | 2024 |
| Trail Collective North Wales CIC | Other services | 2022 |
| Translators’ Tearoom Limited | Hospitality | 2018 |
| Travel Inspirations Limited | Administrative & support | 2015 |
| Trefnant Garage Limited | Wholesale & retail | 2011 |
| Tremdove Ltd | Hospitality | 2019 |
| Tremeirchion Properties Limited | Real estate | 2022 |
| Tribe Fitness Studio's Ltd | Other services | 2018 |
| Triton Wealth Protection Ltd | Professional & scientific | 2025 |
| TRP Consulting Engineers Limited | Administrative & support | 2018 |
| TT23 Studios Ltd | Information & communication | 2024 |
| Tudor House (Prestatyn) Limited | Manufacturing | 2009 |
| Tudor House Cakes Ltd | Professional & scientific | 2012 |
| TVB AIM Ltd. | Construction | 2022 |
| TY DAD Ltd | Hospitality | 2021 |
| TY Gwyn Retreat Ltd | Hospitality | 2026 |
| TYN Cornel Camping Limited | Hospitality | 2021 |
| UK Liner Solutions Ltd | Construction | 2020 |
| UK Lining Technology Ltd | Construction | 2015 |
| UK Therapy Guild Ltd | Health & social care | 2024 |
| Ultra Precision Structured Surfaces (UPS2) Ltd | Manufacturing | 2015 |
| Unique Tiles and Bathrooms Ltd | Wholesale & retail | 2018 |
| UP AIM Ltd. | Professional & scientific | 2020 |
| Upvc Transformation UK Limited | Construction | 2021 |