| Wily Films Ltd | Information & communication | 2024 |
| Winchcombe Farm Limited | Hospitality | 2020 |
| Wine Poole Limited | Wholesale & retail | 2012 |
| Winforton Close Management Company Limited | Households | 2020 |
| Wingbeat Escapes Ltd | Administrative & support | 2022 |
| Wings & Halos Limited | Information & communication | 2020 |
| Wise Choice Travel Limited | Administrative & support | 2022 |
| WIT Software Limited | Information & communication | 2012 |
| Wixey Transport Limited | Transport & logistics | 2003 |
| Wjldac Limited | Manufacturing | 2018 |
| WKZ Services Limited | Administrative & support | 2019 |
| WMK Tax Management Consulting Limited | Professional & scientific | 2015 |
| Woca Denmark (UK) Limited | Wholesale & retail | 2013 |
| Wodr Limited | Professional & scientific | 2024 |
| Wolf Rock Properties Limited | Real estate | 2004 |
| Wolfhart Ltd | Financial services | 2018 |
| Wolseley Group Finco PLC | Financial services | 2025 |
| Wolseley Group Holdings Limited | Financial services | 2021 |
| Wolseley Group Limited | Professional & scientific | 2020 |
| Wolseley Investments Limited | Financial services | 2021 |
| Wolseley Properties Limited | Extraterritorial | 2012 |
| Wolseley UK Finance Limited | Extraterritorial | 1898 |
| Wolseley UK Limited | Wholesale & retail | 1959 |
| Wolverson Advisory Ltd | Real estate | 2020 |
| Wontle Ltd | Information & communication | 2026 |
| Woodfieldbailey Consultancy Ltd | Professional & scientific | 2024 |
| Woodhouse Street Furniture Ltd | Extraterritorial | 2019 |
| Woodley House Residential Limited | Real estate | 2022 |
| Woodloes Fish and Chips Ltd | Hospitality | 2026 |
| Woodville Road Residents Ltd | Households | 2024 |
| Woolley & Co Limited | Professional & scientific | 2010 |
| Woolley Park Farm LLP | | 2003 |
| Woolly Sheep Limited | Information & communication | 1998 |
| Woolpack Management Company Limited | Real estate | 1999 |
| Wootton Grange Ltd | Arts & recreation | 2026 |
| Wootton Trading Ltd | Wholesale & retail | 2026 |
| Word Converters Limited | Professional & scientific | 2006 |
| Word Forge Ltd | Information & communication | 2014 |
| Workshop One Ltd | Arts & recreation | 2025 |
| World Customer Economic Science Limited | Professional & scientific | 2024 |
| World Options (Franchise) Ltd | Professional & scientific | 2012 |
| World Options Holdings Limited | Extraterritorial | 2016 |
| World Options Limited | Transport & logistics | 2004 |
| World Options Systems Limited | Extraterritorial | 2016 |
| World Reserve Global Limited | Financial services | 2018 |
| World Reserve Trust (UK) Limited | Financial services | 2018 |
| World Reserve Trust Technologies Ltd | Professional & scientific | 2021 |
| Worlds END Productions Limited | Extraterritorial | 2005 |
| Worlds END Television Limited | Information & communication | 1999 |
| Worldwide Reduced Emissions Limited | Water & waste | 2007 |
| WOT2GROW Community Orchard C.I.C. | Agriculture & fishing | 2010 |
| WOW Investments Ltd | Real estate | 2016 |
| WOW Lets Ltd | Real estate | 2016 |
| WOW Property Developments Limited | Real estate | 2015 |
| Wowow! Hair International Limited | Other services | 2016 |
| WP Consultants Limited | Real estate | 2025 |
| WQA (UK) Limited | Professional & scientific | 2015 |
| Wrap Brothers Ltd | Manufacturing | 2020 |
| Wrecklessardour Ltd | Health & social care | 2025 |
| Wroxhall Investments Limited | Construction | 1996 |
| WRT Technologies Limited | Administrative & support | 2018 |
| WTR Group UK Holding Limited | Financial services | 2024 |
| Wylde Connections Limited | Education | 2019 |
| Wyrley View Residents Management Company Limited | Households | 2021 |
| X0PA AI Limited | Information & communication | 2017 |
| X:Nilo Engineering Ltd | Manufacturing | 2024 |
| Xafinia Ltd | Information & communication | 2022 |
| Xcite Plumbing and Heating Limited | Construction | 2025 |
| Xeausoft Limited | Information & communication | 2007 |
| Xeric SWP Ltd | Construction | 2025 |
| Xfusion Productions CIC | Education | 2025 |
| XLNT2 Contracts Limited | Construction | 2018 |
| XP Properties LLP | | 2007 |
| Xroadmedia Limited | Information & communication | 2013 |
| Xtransfer UK Limited | Financial services | 2017 |
| Xtreme Robe Wear Ltd | Other services | 2023 |
| Yeleti Limited | Information & communication | 2014 |
| Yellow Diamond Ltd | Extraterritorial | 2024 |
| YI Hong Ltd | Transport & logistics | 2024 |
| YMA Mercia Properties Limited | Real estate | 2025 |
| Yoga at the Heist Ltd | Arts & recreation | 2023 |
| Yori AI Limited | Administrative & support | 2025 |
| Youden IT Ltd | Information & communication | 2026 |
| Young Creative Music Limited | Arts & recreation | 2017 |
| Young People First (Midlands) | Education | 1996 |
| Young Portfolio Investments Ltd | Real estate | 2022 |
| Your Company in the UK Limited | Professional & scientific | 2009 |
| Yourban Limited | Financial services | 2019 |
| Yourroom Sourcing Limited | Other services | 2016 |
| Yousafzai Limited | Professional & scientific | 2008 |
| Youtility Holdco Limited | Information & communication | 2023 |
| Youtility Limited | Information & communication | 2015 |
| Yulin Ltd | Hospitality | 2026 |
| YUM YUM Group Limited | Other services | 2024 |
| YUM YUM Vietnamese Kitchen Ltd | Hospitality | 2022 |
| Yumyum Vietnamese Kitchen Leamington Limited | Hospitality | 2023 |
| Yusofts Limited | Information & communication | 2020 |
| Yvbh Consulting Ltd | Professional & scientific | 2022 |
| YYP Leamington Spa Ltd | Hospitality | 2025 |
| Zafar Colorectal and Digestive Health Ltd | Health & social care | 2026 |