| W Auto Care Ltd | Wholesale & retail | 2026 |
| W R Asbestos Services Limited | Construction | 2016 |
| W. Aspin & Co. Limited | Professional & scientific | 1997 |
| W. E. Walker & SON Limited | Construction | 2003 |
| W.A.M Contractors Limited | Construction | 2015 |
| W.J. Plasterers Ltd | Construction | 2004 |
| W18 Cars Ltd | Wholesale & retail | 2014 |
| Wallflower Consultancy Limited | Information & communication | 2025 |
| Walshaw Moor Estate Group Limited | Real estate | 2023 |
| Walshaw Moor Estate Holdings Limited | Professional & scientific | 2015 |
| Walshaw Moor Estate Limited | Real estate | 2002 |
| Warley Wise Management Services Limited | Professional & scientific | 2025 |
| Waterside Wood Limited | Hospitality | 2019 |
| Wavefive Limited | Information & communication | 2020 |
| WE Fit Aerials Limited | Extraterritorial | 2012 |
| Westend Models (Colne) Limited | Manufacturing | 2022 |
| Whitaker and Smalley GAS Ltd | Construction | 2018 |
| Whitby Projects Group Ltd | Financial services | 2009 |
| Whitby Sea Salt Ltd | Mining & quarrying | 2019 |
| Whitby Sea Weed Ltd | Agriculture & fishing | 2020 |
| Whitby Shepherd Huts Limited | Hospitality | 2020 |
| Whitby Vinegar Limited | Wholesale & retail | 2020 |
| Whiteholme Enterprises Limited | Administrative & support | 2002 |
| Whiteholme Holdings Limited | Financial services | 2021 |
| Whiteoak Contractor Ltd | Construction | 2024 |
| Whiteoak Groundworks Ltd | Construction | 2026 |
| Whitesides Foods Ltd | Manufacturing | 2023 |
| Wicked Bikez Ltd | Wholesale & retail | 2015 |
| Wil's Wishes Ltd | Administrative & support | 2018 |
| Wildfire Floral Co Ltd | Wholesale & retail | 2024 |
| Wildway Adventure Ltd | Education | 2013 |
| Wilmington Services Ltd | Construction | 2024 |
| Wilson Insurance Services Limited | Financial services | 2009 |
| Wilson Oral Surgery and Education Services Ltd | Education | 2024 |
| With U Always Ltd | Extraterritorial | 2013 |
| WME 2023 Holdings Limited | Real estate | 2023 |
| WME 2023 Limited | Real estate | 2023 |
| WMW Chapeau! Limited | Hospitality | 2014 |
| Woodcliffe Upholstery Limited | Manufacturing | 2002 |
| Wrappeduk Limited | Other services | 2017 |
| Wrapterior Limited | Professional & scientific | 2021 |
| Wrongmove Limited | Real estate | 2025 |
| Wycoller Beck Farm Limited | Extraterritorial | 2007 |
| Xlcr Vehicle Management Ltd | Wholesale & retail | 2000 |
| Yorkshire Dales Reclamation Limited | Water & waste | 2025 |
| Yorkshire Pain Clinic Ltd | Health & social care | 2023 |
| Younas Brothers Distribution Ltd | Wholesale & retail | 2024 |
| Yours Facially Aesthetics Ltd | Health & social care | 2021 |
| YUG Domains Ltd | Information & communication | 2021 |
| Zakmoe Properties Limited | Real estate | 2021 |
| Zakmore Limited | Wholesale & retail | 2020 |
| Zero Waste Left Botswana Ltd | Water & waste | 2026 |
| Zest Document Holdings Limited | Wholesale & retail | 2019 |
| Zeta Media Ltd | Professional & scientific | 2025 |
| Zuccini Limited | Wholesale & retail | 2019 |