| Workhorse Services Ltd | Construction | 2002 |
| Worrad Lewin Limited | Real estate | 2014 |
| Wright's Agriculture Limited | Agriculture & fishing | 2021 |
| Wyes Marquees Limited | Administrative & support | 2009 |
| Wymondham Associates (International) Limited | Administrative & support | 2013 |
| Wymondham Dairies Limited | Real estate | 1941 |
| Wymondham Preschool Limited | Education | 2009 |
| Wymondham Preschool Property Limited | Real estate | 2010 |
| Wymondham Windmill Leisure Ltd | Hospitality | 2013 |
| Wymondham Windmill Lettings Limited | Hospitality | 2011 |
| Wymondham Windmill Limited | Hospitality | 2011 |
| Wymondham Woodland and Ways CIC | Agriculture & fishing | 2025 |
| Xaria Events Limited | Other services | 2025 |
| XF Solutions Limited | Information & communication | 2026 |
| Xitax Limited | Professional & scientific | 2015 |
| Xitax Properties Limited | Real estate | 2017 |
| Xoaam Consulting Ltd | Information & communication | 2005 |
| Y. Clayton Building Contractors Limited | Construction | 2012 |
| Y18 Ltd | Professional & scientific | 2025 |
| YDP USA International Ltd | Arts & recreation | 2026 |
| YN Associated Limited | Health & social care | 2022 |
| Yodubzz Studios Ltd | Information & communication | 2021 |
| Young & Fenwick Limited | Construction | 2007 |
| Young & Price Properties Ltd | Real estate | 2023 |
| Young Communities CIC | Education | 2025 |
| Your Italian Wedding Planner Ltd | Other services | 2022 |
| Your Mind at Work Ltd | Other services | 2015 |
| Your Plumbing and GAS Ltd | Construction | 2025 |
| Your Plumbing and Heating Ltd | Construction | 2021 |
| Zeitgeist Tours Ltd | Administrative & support | 2017 |
| Zerospreads FX Limited | Financial services | 2025 |
| Ziggi Systems Limited | Wholesale & retail | 2018 |
| Zinoshi Ltd | Information & communication | 2021 |
| ZIP Marketplace Ltd | Wholesale & retail | 2024 |
| ZLZ Garage Ltd | Wholesale & retail | 2026 |
| ZRC Investments Limited | Real estate | 2024 |