| Wright Properties (UK) Limited | Real estate | 1991 |
| WRP Digital Ltd | Construction | 2023 |
| Wsnq Ltd | Hospitality | 2026 |
| Wssta FC Ltd | Hospitality | 2025 |
| Wstru FC Ltd | Hospitality | 2025 |
| Wycliffe Developments Ltd | Real estate | 2007 |
| Wycliffe Estates Limited | Real estate | 1997 |
| X Truro Barber Ltd | Other services | 2022 |
| XGX AI Ltd | Information & communication | 2023 |
| Xmarks Interactive Ltd | Arts & recreation | 2020 |
| Y M N Cornwall Ltd | Financial services | 2023 |
| Yacht Decking Solutions Ltd | Manufacturing | 2017 |
| Yacht Drop Limited | Information & communication | 2017 |
| Yakshi Limited | Real estate | 2024 |
| Yasmin Annear Ltd | Other services | 2021 |
| Yates Holdings (Cornwall) Limited | Financial services | 2011 |
| Yealm Advisory Limited | Professional & scientific | 2025 |
| YES Chef! Limited | Extraterritorial | 2000 |
| Yesodha EYE Care Limited | Health & social care | 2023 |
| Yottery Limited | Administrative & support | 2025 |
| YOU Made This Limited | Wholesale & retail | 2013 |
| Your Environmental Solutions Ltd | Professional & scientific | 2013 |
| Your Future Sorted CIC | Education | 2026 |
| Your Place Properties Ltd | Real estate | 2023 |
| Your Trusted Tenant Ltd | Real estate | 2019 |
| Ystyn Ltd | Professional & scientific | 2026 |
| Yuki Living Ltd | Hospitality | 2026 |
| Yumbe Limited | Health & social care | 2021 |
| Yummy Cookies Ltd | Hospitality | 2020 |
| Yummy Goodies Limited | Hospitality | 2021 |
| Zamu Ltd | Professional & scientific | 2009 |
| Zatani Ltd | Professional & scientific | 2020 |
| Zelah One and ALL Community Interest Company | Hospitality | 2023 |
| Zookea Limited | Extraterritorial | 2013 |
| Zoomz UK Limited | Information & communication | 2019 |
| Zvs-Fba Ltd | Wholesale & retail | 2025 |
| ZY Ventures Ltd | Wholesale & retail | 2026 |
| ZZ Plant Limited | Hospitality | 2025 |
| {N}.Bora Limited | Information & communication | 2013 |