| Wood Restaurants Limited | Hospitality | 2016 |
| Wood Strategies Limited | Professional & scientific | 2023 |
| Wood's Glass Limited | Construction | 2003 |
| Woodacre (Management Company) Limited | Households | 2017 |
| Woodacres Court Management Company Limited | Households | 2019 |
| Woodbeck Management Company Limited | Households | 2020 |
| Woodford Green Consulting Limited | Professional & scientific | 2024 |
| Woodford Land and Planning Limited | Professional & scientific | 2023 |
| Woodford Road Residents Limited | Households | 2014 |
| Woodland Farms Limited | Agriculture & fishing | 2021 |
| Woodland Medical Limited | Health & social care | 2017 |
| Woodland Place (Saughall) Management Company Limited | Households | 2013 |
| Woodside Radiology LLP | | 2008 |
| Woodview Farm Shop Ltd | Wholesale & retail | 2025 |
| Woody Joe's Ltd | Hospitality | 2022 |
| Wordsworth Medical Ltd | Health & social care | 2022 |
| Work Well Consulting Limited | Professional & scientific | 2020 |
| Workstars Global Ltd | Information & communication | 1998 |
| World of Business Change Limited | Professional & scientific | 2012 |
| Worldwide Private Residences Limited Partnership | | 2006 |
| Worldwide Recycling & Waste Limited | Financial services | 2011 |
| Worrall Estates Limited | Real estate | 2021 |
| Worters Better One Limited | Wholesale & retail | 2023 |
| Wragg Autos Limited | Administrative & support | 2015 |
| Wrap & Taco Mexican Food Ltd | Hospitality | 2026 |
| WRH Properties Limited | Real estate | 2008 |
| Wright Homes Ltd | Real estate | 2016 |
| Wrightington Orthopaedic Specialists LLP | | 2005 |
| WS Shines Limited | Administrative & support | 2026 |
| Wurkplace Limited | Administrative & support | 2011 |
| Wyatt Technology (UK) Limited | Wholesale & retail | 1999 |
| X.0 Advisory Limited | Financial services | 2019 |
| Xavana Limited | Professional & scientific | 2023 |
| Xcalibre Systems Limited | Other services | 1994 |
| Xetius Services Ltd | Information & communication | 2025 |
| XG Turbine Services Ltd | Manufacturing | 2019 |
| XGE 2023 Ltd | Administrative & support | 2022 |
| XGE Renewables Limited | Wholesale & retail | 2021 |
| Xinhua Technology Ltd | Administrative & support | 2024 |
| XN Limited | Administrative & support | 2006 |
| Xobase Ltd | Professional & scientific | 2026 |
| Xstak Ventures Ltd | Information & communication | 2024 |
| Xworks Composites Limited | Manufacturing | 2012 |
| Y Developments Limited | Construction | 2011 |
| Y Glas Farm Anglesey Limited | Real estate | 2021 |
| Y Glynn Cabin Company Limited | Real estate | 2020 |
| Y-Trend Ltd | Wholesale & retail | 2014 |
| Yanzho Yumco Limited | Hospitality | 2023 |
| Yard SK9 Ltd | Transport & logistics | 2022 |
| Yash Pharma Limited | Information & communication | 2014 |
| Yasin Medical Services Ltd | Health & social care | 2014 |
| Ybsocialmedia Limited | Professional & scientific | 2022 |
| YELLOW16 Limited | Professional & scientific | 2018 |
| Yeltron Limited | Health & social care | 2023 |
| Yinqiu International (UK) Ltd | Wholesale & retail | 2023 |
| YKL Properties Limited | Real estate | 2024 |
| YLW Medical Ltd | Health & social care | 2022 |
| YM Developments Ltd | Construction | 2024 |
| Yoke Real Estate Ltd | Professional & scientific | 2023 |
| York Lodge Projects Limited | Construction | 2022 |
| Yorkshire Brain & Spine Limited | Health & social care | 2014 |
| Yorkshire Gastroenterology Ltd | Health & social care | 2019 |
| Yorkshire Soils Restoration Ltd | Water & waste | 2025 |
| Youlink Ltd | Information & communication | 2025 |
| Your Baby Loves Ltd | Wholesale & retail | 2020 |
| Your Brighter Futures Ltd | Education | 2025 |
| Your Dream Cleaning Team Ltd | Administrative & support | 2007 |
| Yourgut Ltd | Health & social care | 2018 |
| Yueyouhomes Limited | Administrative & support | 2022 |
| Yumapos UK Ltd | Wholesale & retail | 2017 |
| Yxteo Limited | Health & social care | 2024 |
| Z Shah Consulting Ltd | Professional & scientific | 2014 |
| Zaddok Ltd | Real estate | 2024 |
| Zaks Medical Limited | Health & social care | 2010 |
| Zaroma Natural Ltd | Wholesale & retail | 2022 |
| Zbit Limited | Information & communication | 2015 |
| ZCH Limited | Health & social care | 2025 |
| Zear Property Limited | Real estate | 2016 |
| Zebra Law Ltd | Professional & scientific | 2022 |
| ZEE Bars Ltd | Hospitality | 2024 |
| Zeebx Limited | Professional & scientific | 2020 |
| ZEN Fitness Ltd | Other services | 2025 |
| Zenor AI Ltd | Information & communication | 2026 |
| Zero Construct Events Ltd | Professional & scientific | 2023 |
| Zero Construct Group Limited | Other services | 2022 |
| Zest Event Experiences Limited | Arts & recreation | 2020 |
| ZEST4 Group Holdco Limited | Extraterritorial | 2021 |
| ZEST4 Group Limited | Information & communication | 2012 |
| ZEST4 IOT Holdco Limited | Extraterritorial | 2021 |
| ZEST4 IOT Limited | Information & communication | 2021 |
| Zeta Infotech Ltd | Information & communication | 2022 |
| Zgorska Consulting Ltd | Professional & scientific | 2026 |
| Ziggle Baby Ltd | Other services | 2015 |
| Ziniho's Pizzas Ltd | Hospitality | 2024 |
| Zodiac Plumbing & Heating Solutions Ltd | Construction | 2023 |
| Zovim Ltd | Professional & scientific | 2024 |
| ZW Consulting Limited | Professional & scientific | 2024 |
| Zylign Limited | Health & social care | 2026 |