| William Marshal Properties Limited | Real estate | 2018 |
| William Morrison Private Property Limited | Agriculture & fishing | 2021 |
| Wilscombe Limited | Real estate | 1982 |
| WIN Clinic Ltd | Professional & scientific | 2018 |
| Windwhistle Consulting Ltd | Professional & scientific | 2019 |
| Winfrith Fields Farm LLP | | 2007 |
| WJ South West Limited | Construction | 2012 |
| WMG Property Limited | Real estate | 2014 |
| Wolf Learning Consulting Ltd | Information & communication | 2015 |
| Woodcote Preservation Limited | Construction | 2006 |
| Woodenstairs Limited | Construction | 2014 |
| Woodenways Timber Frames Limited | Manufacturing | 2007 |
| Woof & Wags in Welly Ltd | Professional & scientific | 2024 |
| Workwear Online Limited | Wholesale & retail | 2013 |
| Wrekin Star Community Interest Company | Arts & recreation | 2024 |
| WRS Holdings Limited | Real estate | 2018 |
| Wyvern Waterpolo Ltd | Wholesale & retail | 2018 |
| Yalham Hayes Farm Ltd | Wholesale & retail | 2018 |
| Yalham Hayes Holdings Ltd | Administrative & support | 2017 |
| Yeatman and Sons Limited | Agriculture & fishing | 2008 |
| YES South West Limited | Financial services | 2021 |
| Your Home Physio Ltd | Other services | 2018 |
| YR Studio Ltd | Wholesale & retail | 2020 |
| Z1 Barbers Ltd | Other services | 2024 |
| Zabru Properties Limited | Professional & scientific | 2003 |
| Zebra Permanent Recruitment Solutions Ltd | Administrative & support | 2019 |
| Zeki Properties Limited | Professional & scientific | 2003 |
| Zero Carbon Marine Limited | Professional & scientific | 2008 |
| Zomerset Services Limited | Construction | 2007 |
| ZS Construct Limited | Construction | 2018 |