| William Matheus Limited | Hospitality | 2022 |
| Willow Banks Forest School Ltd | Education | 2021 |
| Wills Plumbing & Heating Limited | Construction | 2013 |
| Wilpex Limited | Arts & recreation | 2012 |
| Wincanton Creative Print Limited | Manufacturing | 2022 |
| Winding Dial Ltd | Wholesale & retail | 2022 |
| Winesandvines Limited | Agriculture & fishing | 2025 |
| Wings in Waiting Ltd | Administrative & support | 2026 |
| Winstone (UK) Limited | Wholesale & retail | 2011 |
| With Antonia Limited | Other services | 2023 |
| With Locus Software Ltd | Professional & scientific | 2025 |
| Wonder Homes Ltd. | Professional & scientific | 2002 |
| Woodhayes Management (Henstridge) Limited | Real estate | 1990 |
| Woodspoke Ltd | Manufacturing | 2026 |
| Woody Chips Ltd | Information & communication | 2024 |
| Woolmington Yard Management Company Limited | Households | 1998 |
| Wordshop Limited | Professional & scientific | 2002 |
| Worton Two LVA LLP | | 2025 |
| Wright & Doyle Ltd | Arts & recreation | 2023 |
| YA Investments Limited | Professional & scientific | 1998 |
| YA Property Ltd. | Professional & scientific | 2016 |
| Yarlington Mill Properties Ltd | Real estate | 2025 |
| Yeovil and District Model Boat Club Limited | Arts & recreation | 1995 |
| Yeovil LVA LLP | | 2017 |
| Yesterday's Farming Limited | Arts & recreation | 2011 |
| Yetminster LVA LLP | | 2014 |
| Yousef Hammash Ltd | Professional & scientific | 2025 |
| Youth Resource Services (the Rendezvous Sherborne) Ltd | Health & social care | 2011 |
| YSB Consultancy Ltd | Health & social care | 2013 |
| YSE Limited | Administrative & support | 1991 |
| Zoic Palaeotech Limited | Manufacturing | 2022 |
| Zoumpoulia Petraki Limited | Extraterritorial | 2023 |