| Westerdale Developments Limited | Real estate | 2017 |
| Whispers Hearing Ltd | Wholesale & retail | 2012 |
| White Rose Farms Limited | Agriculture & fishing | 2017 |
| Whitehouse Street LLP | | 2013 |
| Wifi Fixer Ltd | Information & communication | 2023 |
| Wildlife for Wellbeing Ltd | Information & communication | 2025 |
| Wilkinson Concrete Ltd | Manufacturing | 2025 |
| Willerby Gents by @NO1 Limited | Other services | 2022 |
| Willerby Hall Flats Limited | Households | 1981 |
| William Curtis Holdings Limited | Real estate | 2021 |
| William Curtis Limited | Construction | 2011 |
| William Jackson & SON Limited | Extraterritorial | 1989 |
| William Jackson & SON Recreation Club Limited | Extraterritorial | 1984 |
| William Jackson Bakery (Export) Limited | Manufacturing | 1941 |
| William Jackson Food Group Limited | Professional & scientific | 2000 |
| William Jackson Foods Limited | Manufacturing | 2018 |
| William Jackson Trustees Limited | Extraterritorial | 1990 |
| Willow Property Services Yorkshire Ltd | Construction | 2019 |
| Willowfield Construction Limited | Construction | 2013 |
| Willows Management Company (Ennerdale) Limited | Real estate | 2005 |
| Wilson Ship Management Ltd | Professional & scientific | 2019 |
| Wind Bidco Limited | Administrative & support | 2023 |
| Windowcraft (Hull) Limited | Construction | 2009 |
| Wise OWL Legal and Medical Ltd | Health & social care | 2020 |
| WJS Executives Limited | Extraterritorial | 2006 |
| WJS Finance (2) Limited | Extraterritorial | 2011 |
| WJS Finance Limited | Extraterritorial | 2000 |
| WJS Health Limited | Extraterritorial | 1999 |
| WJS Properties 2 Limited | Financial services | 2007 |
| WJS Properties Limited | Construction | 2007 |
| WNC Trading Limited | Wholesale & retail | 2024 |
| Wold Farms Breeding Limited | Extraterritorial | 2013 |
| Wold Farms Limited | Agriculture & fishing | 2014 |
| Wolkowski Consultancy Limited | Professional & scientific | 2025 |
| Woodcock Consultancy (Hull) Ltd | Professional & scientific | 2021 |
| Woodcock Properties Hessle Ltd | Real estate | 2025 |
| Woodfield Aesthetics Ltd | Health & social care | 2016 |
| Woodfield Property & Interiors Ltd | Real estate | 2025 |
| Woomble Investments Limited | Construction | 2005 |
| Workforce Technologies Limited | Information & communication | 2019 |
| WPL Risk Advisory Limited | Professional & scientific | 2023 |
| WPL Technology Limited | Professional & scientific | 2023 |
| WYM Group Ltd | Professional & scientific | 2019 |
| Xpirt Limited | Professional & scientific | 2003 |
| XPS Solutions Ltd | Information & communication | 2006 |
| Yellow Lamb Creative Limited | Information & communication | 2024 |
| YES Group Capital (EOT) Limited | Other services | 2025 |
| YES Group Capital Limited | Professional & scientific | 1998 |
| York Parties Limited | Professional & scientific | 2014 |
| Yorkshire & Lincolnshire Developments Limited | Real estate | 2001 |
| Yorkshire Botanicals Limited | Agriculture & fishing | 2015 |
| Yorkshire Care at Home Limited | Health & social care | 2017 |
| Yorkshire Endocare Ltd | Health & social care | 2025 |
| Yorkshire Motorhome Sales Limited | Wholesale & retail | 2015 |
| Yould Publications Ltd | Information & communication | 2003 |
| Your Next Level Fitness Ltd | Arts & recreation | 2015 |
| Your Telecom Partner Ltd | Real estate | 2011 |
| Yourtime Executive Support Ltd | Administrative & support | 2025 |
| Zakbridge Interiors Limited | Construction | 2026 |
| Zellah Medicare Ltd | Health & social care | 2025 |
| Zenith General Building Contractors Limited | Construction | 2026 |
| Zero Heroes Ltd | Information & communication | 2024 |
| Zigzag Design Studio (UK) Ltd | Professional & scientific | 2011 |
| Zinzan Books Limited | Wholesale & retail | 2012 |
| Zooms Security Ltd | Extraterritorial | 2021 |