| Suited Brands Limited | Professional & scientific | 2014 |
| Summit Branding Ltd | Wholesale & retail | 2019 |
| Sunnydowns Management Limited | Hospitality | 2016 |
| Superoptom Co. Ltd | Professional & scientific | 2017 |
| Supertemps Limited | Administrative & support | 2001 |
| Supply Link Internet Limited | Health & social care | 2002 |
| Supreme Cigars Ltd | Wholesale & retail | 2023 |
| Sure Hope Church | Other services | 2008 |
| Surelock Homes (UK) Limited | Transport & logistics | 2005 |
| Surescaff Limited | Construction | 2012 |
| Surface Repair Chester North Wales Ltd | Manufacturing | 2017 |
| Surgiscope Services Ltd | Hospitality | 2019 |
| Surity Composites Limited | Financial services | 2025 |
| Sweet Media Solutions Ltd | Professional & scientific | 2012 |
| Synergy Sports NW Limited | Arts & recreation | 2016 |
| T Dunn Consultancy Ltd | Real estate | 2023 |
| T J Property Maintenance Solutions Ltd | Construction | 2023 |
| T&T Cartref Limited | Real estate | 2024 |
| T&T Media Limited | Information & communication | 2024 |
| T.D. Plant Contractors Limited | Administrative & support | 2019 |
| TAI Eryri Lettings Limited | Real estate | 2020 |
| TAI Eryri Ltd | Real estate | 2018 |
| Tal-Y-Cafn Kennels Limited | Other services | 2005 |
| Tatws Trading Ltd | Wholesale & retail | 2020 |
| Taxworks Accountancy Services Limited | Professional & scientific | 2019 |
| Taylor Magee Biomedical Limited | Financial services | 2024 |
| TBC Marketing Limited | Extraterritorial | 2005 |
| TDB Conservation Ltd | Professional & scientific | 2026 |
| Teamplus Partners Limited | Administrative & support | 2011 |
| Techbase Accessories Limited | Wholesale & retail | 2014 |
| Technologic Security Services Ltd | Administrative & support | 2025 |
| Techo Property Lettings Limited | Other services | 2015 |
| Teigr Ltd | Construction | 2018 |
| Tereen Ltd | Health & social care | 2015 |
| Tessmac Estates Ltd | Real estate | 2021 |
| THE Acting Studio Ltd | Arts & recreation | 2024 |
| THE Active MUM Club Ltd | Other services | 2025 |
| THE Bath House (Penallta) Limited | Real estate | 2018 |
| THE Bay HOP Ltd | Hospitality | 2016 |
| THE BEE Inn Limited | Hospitality | 2019 |
| THE Brain Team CIC | Health & social care | 2015 |
| THE Canine Behaviour & Training Society | Administrative & support | 2000 |
| THE Celtic HAT Company Limited | Wholesale & retail | 2014 |
| THE Colwyn Bay Hearing Practice Ltd | Wholesale & retail | 2018 |
| THE Department of Fit Limited | Other services | 2017 |
| THE Energise Academy Limited | Health & social care | 2016 |
| THE Energy Grants Group Ltd | Other services | 2023 |
| THE Gables Rest Home Ltd | Other services | 1997 |
| THE Global Design Studio Ltd | Wholesale & retail | 2022 |
| THE Grape to Glass Wine Company Limited | Wholesale & retail | 2016 |
| THE Holding Company London Limited | Extraterritorial | 2022 |
| THE Holding Company Retail Limited | Extraterritorial | 2022 |
| THE Jigsaw Organisation Limited | Extraterritorial | 2012 |
| THE Kind Bay Initiative Community Interest Company | Hospitality | 2019 |
| THE Knight Shop International Ltd | Wholesale & retail | 2008 |
| THE Light Guide Company Ltd | Information & communication | 1998 |
| THE Majestic Flat Company Limited | Households | 2020 |
| THE Masala Take Away Ltd | Hospitality | 2013 |
| THE Mistrals Management Company Limited | Households | 1999 |
| THE Oaks Partnership LLP | | 2018 |
| THE Olives 2022 Ltd | Hospitality | 2022 |
| THE Physio North Wales Ltd | Health & social care | 2022 |
| THE Reserve Conwy Ltd | Real estate | 2018 |
| THE Sun Inn Colwyn Ltd | Hospitality | 2025 |
| THE Toad PUB Rhos Ltd | Hospitality | 2023 |
| THE VIC Llandudno Ltd | Hospitality | 2024 |
| THE Willow Collective CIC | Education | 2021 |
| THE Wish Wash Company Limited | Administrative & support | 2005 |
| Thomas Tipis Ltd | Construction | 2023 |
| Thompson Walker Developments Limited | Construction | 2024 |
| Thorn Luxury Lettings Limited | Real estate | 2022 |
| Thornley Leisure Parks Limited | Hospitality | 2022 |
| Thought Health Ltd | Health & social care | 2021 |
| Thrive Counselling CIC | Health & social care | 2024 |
| Thrivemind Training & Consultancy Limited | Professional & scientific | 2024 |
| THU Shipping and Trading Limited | Wholesale & retail | 2021 |
| Tile King NW Ltd | Wholesale & retail | 2024 |
| TIM Crowley Limited | Information & communication | 2018 |
| Timberus International Ltd | Wholesale & retail | 2023 |
| Time 4 Business Services Ltd | Professional & scientific | 2015 |
| TJH Materials Testing Ltd | Professional & scientific | 2021 |
| Toad & Toadette Manor Limited | Hospitality | 2015 |
| Toffee Heaven Ltd | Wholesale & retail | 2011 |
| Together for Colwyn Bay Ltd | Wholesale & retail | 2021 |
| Tom's Treats Ltd | Wholesale & retail | 2022 |
| Tomorrow's Mind Limited | Other services | 2016 |
| Top CUT Barber 1 Ltd | Other services | 2022 |
| Top Fade Babers Ltd | Other services | 2025 |
| Top GRP Ltd | Construction | 2024 |
| Top Stream Pets Limited | Agriculture & fishing | 2014 |
| Top WOK 117 Ltd | Hospitality | 2024 |
| Topgear Tech Limited | Other services | 2019 |
| Total Origin Ltd | Wholesale & retail | 2026 |
| Touring Accessories Ltd | Wholesale & retail | 2023 |
| Tourism Trading Limited | Administrative & support | 1997 |
| Trac Consultancy Limited | Information & communication | 2001 |
| TRAC360 Ltd | Administrative & support | 2008 |
| Tracey Elisabeth Couture Limited | Manufacturing | 2023 |
| Train Safe Solutions Ltd | Other services | 2021 |
| TRAIN4ALN CIC | Education | 2021 |