| Winged Lion Investment Partners Limited | Professional & scientific | 2025 |
| Winkhurst Investments Limited | Real estate | 2023 |
| Winners Walk Limited | Information & communication | 2011 |
| Winpro Ukeua Limited | Manufacturing | 2022 |
| Winstone Marketing Communications Ltd | Wholesale & retail | 2003 |
| Wisecube Consulting Ltd | Information & communication | 2014 |
| Wisentric Limited | Information & communication | 2026 |
| Wiser Learning Ltd | Education | 2023 |
| Wiser Safety Management Ltd | Professional & scientific | 2010 |
| Wisteria Building and Carpentry Ltd | Construction | 2022 |
| Withers Property Co. Ltd | Construction | 2025 |
| Witz Consultancy Limited | Professional & scientific | 2018 |
| WJ Orthopaedics Ltd | Health & social care | 2020 |
| WJM Medical Ltd | Health & social care | 2019 |
| WKS Design & Build Ltd | Construction | 2025 |
| WLP Kent Ltd | Wholesale & retail | 2025 |
| Wobo Group Limited | Wholesale & retail | 2018 |
| Wolfe Brick & Stone Repair Limited | Construction | 2019 |
| Wombat Wrapping Limited | Manufacturing | 2013 |
| Women`S Health Specialists Limited | Extraterritorial | 2003 |
| Woodandwork LP | | 2011 |
| Woodford House Investments Limited | Real estate | 2022 |
| Woodford Park Homes Ltd | Households | 2018 |
| Woodgate Mews Management Limited | Professional & scientific | 2011 |
| Woodhams Plant Sourcing Limited | Wholesale & retail | 2020 |
| Woodhatch Design Limited | Construction | 2017 |
| Woodhill Construction Contractors Ltd | Construction | 2022 |
| Woodland Creatures Trading UK Ltd | Wholesale & retail | 2023 |
| Woodlands Farm Developments Limited | Administrative & support | 1992 |
| Woodreed 2006 Limited | Professional & scientific | 2006 |
| Woodrow City Limited | Professional & scientific | 1995 |
| Woods & Watkins Construction Group Ltd | Construction | 2024 |
| Woodside Park Homes (Kent) Limited | Hospitality | 2020 |
| Woodside SPV Limited | Real estate | 2017 |
| Woody Stump Creations Limited | Agriculture & fishing | 2025 |
| Word and Pixel Limited | Information & communication | 2019 |
| Wordzworth Limited | Administrative & support | 2006 |
| Working Solutions-Growing Together Limited | Health & social care | 2006 |
| World of Pots Ltd | Wholesale & retail | 2020 |
| Worley Technical Services Ltd | Professional & scientific | 2025 |
| Worth IT Professional Ltd | Information & communication | 2022 |
| Wragg Industries Ltd | Manufacturing | 2015 |
| Wrappd (UK) Ltd | Wholesale & retail | 2020 |
| WRD Logistics Limited | Transport & logistics | 2011 |
| Writers HQ Ltd | Education | 2016 |
| Wrpm Consulting Limited | Professional & scientific | 2014 |
| WT Management Ltd | Professional & scientific | 2018 |
| Wyngrove Limited | Hospitality | 2003 |
| X-Lam UK Ltd | Administrative & support | 2017 |
| Xakt Ltd | Professional & scientific | 2010 |
| Xetaone Ltd | Information & communication | 2026 |
| Xetavault GB Ltd | Professional & scientific | 2025 |
| Xhibit Solutions Ltd | Administrative & support | 2003 |
| XLB Exterior Cleaning Ltd | Administrative & support | 2026 |
| Xogo Ltd | Professional & scientific | 2025 |
| Xrayvision Limited | Arts & recreation | 2014 |
| Y&W Ltd | Health & social care | 2019 |
| Y4CHT Limited | Information & communication | 2020 |
| Yalding Enterprise Park Ltd | Real estate | 2022 |
| Yard & Borough Consultancy Limited | Professional & scientific | 2025 |
| Yardfitness TW Ltd | Arts & recreation | 2025 |
| YAY! Productions Limited | Arts & recreation | 2003 |
| YDS Security Ltd | Administrative & support | 2018 |
| Yellow Cat Property Limited | Real estate | 2024 |
| Yeomans Press Limited | Manufacturing | 2004 |
| YEP Property Ltd | Construction | 2018 |
| YES to Planet Limited | Wholesale & retail | 2018 |
| Yescolours Paints Limited | Manufacturing | 2020 |
| Yeso Properties Ltd | Real estate | 2020 |
| YEW Tree Lakes Ltd | Agriculture & fishing | 2015 |
| Ymcw Consultancy Ltd | Financial services | 2012 |
| Ymcw Property Limited | Real estate | 2026 |
| Yoga & ME Limited | Extraterritorial | 2018 |
| Yokabi London Ltd | Wholesale & retail | 2025 |
| Yorkbury Associates Ltd | Professional & scientific | 2020 |
| Yorklem Properties Limited | Real estate | 1991 |
| YOU Optimised Limited | Health & social care | 2022 |
| Your Bespoke Build Ltd | Construction | 2021 |
| Your New Tomorrow Limited | Real estate | 2007 |
| Your Office Events Team Ltd | Wholesale & retail | 2022 |
| Your Skin Coach Limited | Other services | 2025 |
| YOURSTORE24 Limited | Real estate | 2016 |
| Youth Voice Heard C.I.C. | Information & communication | 2021 |
| Yuple Limited | Information & communication | 2023 |
| Z4 Studio Ltd | Arts & recreation | 2026 |
| Zallio Transport Solutions Limited | Transport & logistics | 2019 |
| Zantec Limited | Manufacturing | 1993 |
| Zara Beauty and Spa Ltd | Other services | 2024 |
| Zbmc Limited | Professional & scientific | 2016 |
| Zebras Bar Sales Ltd | Hospitality | 2010 |
| Zein Khalifa Limited | Professional & scientific | 2016 |
| Zentoku Ltd | Health & social care | 2019 |
| Zero Peters Village LLP | | 2022 |
| Zest Commercial Cleaning Ltd | Administrative & support | 2009 |
| Zico 199 Freehold Limited | Real estate | 2023 |
| Zico 199 Ltd | Real estate | 2020 |
| Zico 199A Limited | Real estate | 2023 |
| Zico 201 Limited | Real estate | 2023 |
| Zico 203 Limited | Real estate | 2020 |
| Zico 205 Limited | Real estate | 2020 |