| Winher Competitions Limited | Arts & recreation | 2025 |
| Winksy Ltd | Wholesale & retail | 2018 |
| Winston Meats Limited | Hospitality | 2024 |
| Winter ARC Driving School Ltd | Education | 2026 |
| Winter Management Limited | Construction | 2018 |
| Wintersweet Limited | Construction | 2022 |
| Wisnet Ltd | Information & communication | 2022 |
| With Style Ltd | Other services | 2023 |
| Wiznans Ltd | Wholesale & retail | 2025 |
| WJ Glass and Windows Limited | Manufacturing | 2019 |
| WML Consultants Limited | Financial services | 2026 |
| Wolvex Limited | Wholesale & retail | 2019 |
| Women@Tech Ltd. | Other services | 2022 |
| Wonderful Brands Limited | Wholesale & retail | 2017 |
| Wonderful Hair Shop Limited | Other services | 2000 |
| Wonderful Living Limited | Construction | 2015 |
| Wood Environmental Services Ltd | Agriculture & fishing | 2022 |
| Woodburner Showrooms Ltd | Wholesale & retail | 2016 |
| Woodcraft Carpentry & Building Limited | Construction | 2021 |
| Woodcroft Consulting Group Ltd | Professional & scientific | 2024 |
| Woodland Vale (Swanwick) Management Company Limited | Households | 2021 |
| Woodland Wildlings Forest School Ltd | Education | 2021 |
| Woodmancote Residents' Woodland Limited | Agriculture & fishing | 2025 |
| Woodstock Suites Limited | Hospitality | 2013 |
| Woodworks Building Services Limited | Construction | 2014 |
| Work Rest and Stay Group Ltd | Hospitality | 2018 |
| Work'N'Diversity CIC | Education | 2024 |
| Working Technologies Limited | Information & communication | 2003 |
| Working Telecoms Limited | Information & communication | 2014 |
| Workout With Erin Ltd | Other services | 2026 |
| Workwithlight Limited | Professional & scientific | 2009 |
| World of Blanks Ltd | Wholesale & retail | 2024 |
| World of Creation Limited | Professional & scientific | 2005 |
| Worlds END Equine Centre Limited | Arts & recreation | 2010 |
| Wotbrew Limited | Information & communication | 2024 |
| Wowporium Limited | Wholesale & retail | 2024 |
| Wraith Operators Limited | Construction | 2021 |
| Wraxall Yacht Services Ltd | Manufacturing | 2018 |
| Wray Rail Ltd | Construction | 2025 |
| Wrea Head Limited | Hospitality | 2012 |
| Wright & Hill Holdings Ltd | Financial services | 2020 |
| Wrights Exterior Cleaning Services Ltd | Water & waste | 2025 |
| WSM IT Solutions Ltd | Information & communication | 2024 |
| Wurke Limited | Manufacturing | 2023 |
| Www.Oneomarket.Com Ltd | Other services | 2023 |
| Wyldthingsuk Limited | Wholesale & retail | 2024 |
| Wyldwood Landscaping Ltd | Administrative & support | 2026 |
| Wyldwood Ltd | Construction | 2023 |
| Wymering Manor Trust | Arts & recreation | 2013 |
| X Fifty Two Limited | Information & communication | 2021 |
| X.O Builders Limited | Construction | 2022 |
| X2 Pilates Limited | Arts & recreation | 2023 |
| X20 Limited | Administrative & support | 2019 |
| Xalterra Ltd | Information & communication | 2017 |
| Xenial Consultancy Limited | Professional & scientific | 2016 |
| Xeres Ltd | Real estate | 2021 |
| Xerry V Bites Limited | Hospitality | 2025 |
| Xgnd Ltd | Professional & scientific | 2022 |
| XI Electrical Ltd | Construction | 2023 |
| XIP Capital Limited | Financial services | 2016 |
| XIP Holdings Limited | Construction | 2018 |
| XIP Invest Limited | Other services | 2019 |
| XIP Services Limited | Other services | 2020 |
| Xnav Electrical Ltd | Construction | 2017 |
| Xoren Limited | Construction | 2024 |
| Xplore-U Aesthetics Ltd | Other services | 2024 |
| Xtrimlabz Ltd | Arts & recreation | 2008 |
| XVO Media Ltd | Information & communication | 2022 |
| Y Services for Young People | Education | 2011 |
| Y.F.Yang Ltd | Real estate | 2011 |
| Yanjuu Limited | Professional & scientific | 2022 |
| Yanreno Limited | Other services | 2023 |
| Yasin Consultancy Ltd | Professional & scientific | 2026 |
| Yellow Hair Products UK Limited | Other services | 2018 |
| YEW Tree SL1 Ltd | Real estate | 2024 |
| Yield H S Limited | Wholesale & retail | 2016 |
| Yokai London Limited | Wholesale & retail | 2024 |
| York Engineered Systems Limited | Professional & scientific | 1945 |
| York International (Holdings) Limited | Professional & scientific | 1994 |
| York International Limited | Professional & scientific | 1985 |
| York’S Building & Property Services Ltd | Construction | 2023 |
| You'Ve BIN Cleaned Hampshire Ltd | Health & social care | 2025 |
| Youern Coactive Ltd | Professional & scientific | 2023 |
| Young Cleaning Services Limited | Administrative & support | 2016 |
| Your Bodacious Lashes Ltd | Other services | 2024 |
| Your Digital Scrapbook Ltd | Professional & scientific | 2025 |
| Your Holiday Experts Ltd | Administrative & support | 2017 |
| Your Laser Lounge Ltd | Manufacturing | 2023 |
| Your Local FOX Ltd | Hospitality | 2023 |
| Your Online Retail Ltd | Wholesale & retail | 2026 |
| Your Perfection Ltd | Health & social care | 2017 |
| Your Personal Gym Ltd | Arts & recreation | 2014 |
| Your Pets Naturally Ltd | Wholesale & retail | 2024 |
| Yourz Limited | Manufacturing | 2018 |
| Yrjm Limited | Extraterritorial | 2011 |
| Yummie Group Limited | Wholesale & retail | 2020 |
| Z and H Private Limited | Administrative & support | 2025 |
| Z L Debiec Building Limited | Construction | 2024 |
| Zahid Properties Limited | Real estate | 2023 |
| ZAK Multi Solutions Ltd | Construction | 2025 |