| William Cooper Limited | Construction | 1991 |
| Wilson Holdings (Yorkshire) Ltd | Professional & scientific | 2024 |
| Winn and Winn Properties Limited | Real estate | 2022 |
| Witwood Food Products Limited | Professional & scientific | 2005 |
| WMS Entrance Systems Limited | Construction | 2003 |
| Wontun Digital Limited | Information & communication | 2024 |
| Woolrich Limited | Wholesale & retail | 2020 |
| Work & Leisure Vehicles Limited | Wholesale & retail | 2013 |
| WS Commerce Ltd | Financial services | 2022 |
| WSF Mobile Valeting Ltd | Administrative & support | 2024 |
| Xoxo Tanning Ltd | Other services | 2022 |
| Yippee Business Centre Limited | Real estate | 2015 |
| YOR VA Group Ltd | Administrative & support | 2024 |
| Yorkshire Abattoir Services Limited | Agriculture & fishing | 2015 |
| Yorkshire Boiler Hire Ltd | Construction | 2023 |
| Yorkshire Halal Meat Limited | Manufacturing | 2026 |
| Yorkshire Laminate & Wood Flooring Ltd | Wholesale & retail | 2018 |
| Yorkshire Pro Driveways Limited | Construction | 2025 |
| Yorkshire Property Services Group Ltd | Other services | 2021 |
| Yorkshire PSV and Light Vehicle Specialist Ltd | Wholesale & retail | 2023 |
| Yorkshire Seafoods Limited | Wholesale & retail | 2018 |
| Yorkshire Taillift Services Limited | Wholesale & retail | 2008 |
| Yorkshire Transport (Dept) Limited | Transport & logistics | 2015 |
| Young Discoverers Limited | Education | 2008 |
| Your Build Ltd | Construction | 2014 |
| YTS Leeds Limited | Wholesale & retail | 2025 |
| Yumi Thai Ltd | Hospitality | 2021 |
| ZAK Summerscales Ltd | Transport & logistics | 2026 |
| Zeina Foods Limited | Manufacturing | 2000 |
| Zeina Park Holding Limited | Households | 2024 |
| Zemanga Limited | Financial services | 2022 |
| Zeppelin Developments Limited | Construction | 2016 |
| ZEUS777 Ltd | Information & communication | 2025 |
| Zion Access Management Limited | Households | 2019 |
| Zydova Ltd | Wholesale & retail | 2025 |