| Trainwithtom Ltd | Other services | 2025 |
| Tregenhorne Farm (ST Erth) Management Company Limited | Real estate | 2003 |
| Treglisson Pods Ltd | Hospitality | 2020 |
| Trevaskis Farm Limited | Wholesale & retail | 2014 |
| Trewhella Chiropractic Ltd | Health & social care | 2013 |
| Triple Scoop Group Ltd | Real estate | 2026 |
| Triskel Marine Limited | Manufacturing | 2003 |
| Trythogga Holdings Limited | Financial services | 2025 |
| TT Bryant Ltd | Real estate | 2022 |
| Tuckers Downs Limited | Hospitality | 2014 |
| Tuckers Downs Property Management Limited | Real estate | 2026 |
| UK Medilink Ltd | Wholesale & retail | 2023 |
| Ultrabeam Limited | Professional & scientific | 2018 |
| Uncrewed Survey Solutions Limited | Professional & scientific | 2014 |
| UNI Direct Limited | Education | 2016 |
| Unique Hideaways Limited | Hospitality | 2021 |
| Unity Consulting Limited | Health & social care | 2013 |
| Uptech Solutions Ltd | Information & communication | 2024 |
| Utopia Property Cornwall Limited | Real estate | 2022 |
| VC & WGM Cock Limited | Agriculture & fishing | 2020 |
| Velmuria Ltd | Wholesale & retail | 2025 |
| Venture Outdoors Cornwall Ltd | Administrative & support | 2023 |
| Verus Retail Limited | Wholesale & retail | 2017 |
| Victoria Square PZ Limited | Professional & scientific | 2018 |
| Vyntara Group Limited | Administrative & support | 2025 |
| W Faull Plant Hire Ltd. | Construction | 2014 |
| Warrior Wisdom CPD & Consultancy Ltd | Education | 2024 |
| Wave Hub Grid Connection Limited | Professional & scientific | 2021 |
| Wave Property Developments Ltd | Construction | 2020 |
| Webb and Philp Limited | Construction | 2001 |
| Weidner Electrical Ltd | Construction | 2018 |
| Welcome Home Investments Limited | Real estate | 1973 |
| West Cornwall Carpentry and Construction Ltd | Construction | 2023 |
| West Cornwall Plastics Limited | Construction | 2016 |
| West Cornwall Windows & Conservatories Limited | Manufacturing | 2017 |
| Western Innovations Ltd | Construction | 2018 |
| Western Waste Limited | Water & waste | 2001 |
| Wheal Alfred Metal Recycling Ltd | Water & waste | 2003 |
| Whealcall Ltd | Information & communication | 2026 |
| White Hart Hotels Limited | Real estate | 1995 |
| Whittall Construction Ltd | Construction | 2018 |
| Wight Locations Limited | Administrative & support | 2005 |
| Wild Seas Ltd | Wholesale & retail | 2023 |
| Wilde Spaces Ltd | Administrative & support | 2026 |
| Wildwood Fuels Limited | Manufacturing | 2025 |
| Williams Equine Limited | Agriculture & fishing | 2022 |
| Wise Heron Limited | Real estate | 2014 |
| Woodworx Ltd | Construction | 2012 |
| Worval Holdings Limited | Hospitality | 2021 |
| WRP1 Limited | Real estate | 2025 |
| Xodar Limited | Energy | 2022 |
| Yearveer Limited | Real estate | 1981 |
| Zenia Collection Limited | Administrative & support | 2015 |
| Zephyr Creative Ltd | Professional & scientific | 2011 |