| Wotton Limited | Manufacturing | 1947 |
| Wotton Rope Access Ltd | Professional & scientific | 2017 |
| Wray Valley Ltd | Hospitality | 2019 |
| Wray-Mccann Architect Limited | Professional & scientific | 2011 |
| Wright Electrical Services (SW) Ltd | Construction | 2019 |
| WS Property Maintenance Limited | Construction | 2022 |
| WTR Plumbing Heating & Electrical Contractors Ltd | Construction | 2019 |
| WTW - Scott Cinemas Limited | Information & communication | 2000 |
| Wyndham Commercials Ltd | Wholesale & retail | 2023 |
| Wyse Construction (South West) Limited | Construction | 2014 |
| Wyse Estates Holdings Limited | Financial services | 2004 |
| Wyse Homes Group Limited | Construction | 2014 |
| Wyse Homes Limited | Construction | 2011 |
| Wyse Project Build (South West) Limited | Construction | 2014 |
| Wyse Projects Limited | Construction | 2014 |
| X - MET Ltd | Professional & scientific | 2008 |
| X-Jet Technology Ltd | Wholesale & retail | 2025 |
| XCAV8 ( SW ) Ltd | Construction | 2010 |
| Xenom Events Ltd | Arts & recreation | 2026 |
| XYZ Haulage Limited | Transport & logistics | 2001 |
| Y.G.C. Claycutters Ltd | Hospitality | 2020 |
| Y.G.C. Cleave Ltd | Hospitality | 2019 |
| Y.G.C. Holdings Limited | Financial services | 2024 |
| Yacht Solutions Europe Limited | Manufacturing | 2021 |
| Yakkity YAK Limited | Wholesale & retail | 2005 |
| Yeti Visuals Co Ltd | Information & communication | 2025 |
| YEW Tree Lettings Ltd | Real estate | 2021 |
| Yoga London Ltd | Arts & recreation | 2009 |
| Yogi Accounts Ltd | Professional & scientific | 2018 |
| Yorklands Limited | Transport & logistics | 1992 |
| YOU Live and Learn Limited | Education | 2010 |
| Youlden Farm Limited | Agriculture & fishing | 2006 |
| Your Big Event Limited | Arts & recreation | 2011 |
| Your Devon Escape Ltd | Hospitality | 2018 |
| Yourchoice Devon Ltd | Administrative & support | 2017 |
| Yuki Fenikkusu Property Investment Limited | Real estate | 2020 |
| Zaap Thai Ltd | Hospitality | 2023 |
| Zasu Travels Ltd | Administrative & support | 2025 |
| ZEN Scaling Ltd | Information & communication | 2020 |
| Zeonly Ltd | Hospitality | 2025 |
| Zero Eight Studios Ltd | Arts & recreation | 2018 |
| Zero Waste Moretonhampstead Limited | Wholesale & retail | 2019 |
| Zion Apts Management Ltd | Households | 2022 |
| Zodiac South West Home Management Services Ltd | Households | 2026 |
| Zoet Production Ltd | Professional & scientific | 2025 |
| Zofia Food Ltd | Hospitality | 2024 |
| Zooc Ltd | Information & communication | 2021 |
| ZVS Logistics Ltd | Transport & logistics | 2019 |
| ÍSÓ Housing Group CIC | Real estate | 2021 |