| Yeomarks Lining Ltd | Construction | 2016 |
| Yeotec Limited | Administrative & support | 2017 |
| Yeovil and District Chamber CIC | Other services | 2023 |
| Yeovil Area Community Academy Trust | Education | 2013 |
| Yeovil Athletics Club Ltd | Arts & recreation | 2020 |
| Yeovil Auctions.Com Ltd | Wholesale & retail | 2024 |
| Yeovil Beer Festival Limited | Arts & recreation | 2016 |
| Yeovil Cabs Limited | Transport & logistics | 2024 |
| Yeovil Chicken Shack Ltd | Hospitality | 2024 |
| Yeovil Circuits Limited | Manufacturing | 1983 |
| Yeovil Court Hotel Limited | Hospitality | 2021 |
| Yeovil Cycle Repairs Ltd | Wholesale & retail | 2023 |
| Yeovil Electrics Limited | Construction | 2023 |
| Yeovil Family Church | Other services | 2014 |
| Yeovil Flavour Ltd | Hospitality | 2026 |
| Yeovil Football & Athletic Club Limited(The) | Arts & recreation | 1923 |
| Yeovil Gear Services Limited | Manufacturing | 1999 |
| Yeovil Haulage Limited | Transport & logistics | 2003 |
| Yeovil Laundromat & DRY Cleaning Ltd | Administrative & support | 2026 |
| Yeovil Machine Tools Limited | Professional & scientific | 1996 |
| Yeovil Mini Market Ltd | Wholesale & retail | 2025 |
| Yeovil Nails 6868 Limited | Other services | 2025 |
| Yeovil Padel House Ltd | Arts & recreation | 2026 |
| Yeovil Plumbing Supplies Limited | Wholesale & retail | 2001 |
| Yeovil Podiatry Limited | Health & social care | 2023 |
| Yeovil Precision Company Ltd. | Manufacturing | 2017 |
| Yeovil Promise Alpha Ltd | Construction | 2025 |
| Yeovil Properties Ltd | Real estate | 2019 |
| Yeovil Securities Limited | Financial services | 1957 |
| Yeovil Skate Inclusive CIC | Arts & recreation | 2024 |
| Yeovil Tattoo Fest Ltd | Arts & recreation | 2025 |
| Yeovil Tekla Design Ltd | Construction | 2018 |
| Yeovil Town Community Sports Trust Limited | Administrative & support | 2008 |
| Yeovil Town Holdings Limited | Arts & recreation | 2009 |
| Yeovil Transport Limited | Transport & logistics | 2024 |
| Yetminster Community Sports Club Ltd | Arts & recreation | 2020 |
| Ymonda Limited | Information & communication | 2016 |
| YMT Limited | Manufacturing | 1992 |
| YOU Care & WE Care Support Services Ltd | Administrative & support | 2023 |
| Young Britannia Ltd | Wholesale & retail | 2012 |
| Your Financial Planning Ltd | Professional & scientific | 2008 |
| Z to a Mobile Ltd | Wholesale & retail | 2024 |
| Zane and Zeke Ltd | Health & social care | 2025 |
| Zane Gabriel Limited | Health & social care | 2018 |
| Zeno Agency Limited | Other services | 2008 |
| Zeus Aerospace Limited | Manufacturing | 2015 |
| Zeus CAD Limited | Professional & scientific | 2012 |
| Ziontech Solutions Ltd | Information & communication | 2002 |
| Zodiac Security Limited | Administrative & support | 2004 |
| Zone VI Ltd | Wholesale & retail | 2020 |
| Zync Hospitality Ltd | Hospitality | 2025 |