| WE ARE Earthling Limited | Wholesale & retail | 2024 |
| Web Brix Ltd | Information & communication | 2024 |
| Webb and Martin Properties Ltd | Households | 2020 |
| Webifun Marketing Ltd | Professional & scientific | 2024 |
| Websirus Ltd | Information & communication | 2026 |
| Webster Floors Ltd | Wholesale & retail | 2012 |
| Wendy Benstead Limited | Wholesale & retail | 2012 |
| Western Electric Limited | Construction | 2018 |
| Westgate Avenue Group Ltd | Wholesale & retail | 2025 |
| Westhill Trading Limited | Wholesale & retail | 2011 |
| Wexler Craine Limited | Financial services | 2025 |
| Weybridge & Esher Landscaping Limited | Administrative & support | 2019 |
| Wheatagrove Ltd | Transport & logistics | 2023 |
| Where’S the Food Ltd | Other services | 2019 |
| White Rainbow Studio Ltd | Arts & recreation | 2020 |
| Whitehills Care Ltd | Public administration | 2023 |
| Whiteside Investments Limited | Real estate | 2018 |
| Whitman Landscaping Limited Limited | Administrative & support | 2025 |
| WHY NOT ME Limited | Information & communication | 2014 |
| Whyte Solutions Ltd | Information & communication | 2019 |
| Wijji Solutions UK Ltd | Information & communication | 2023 |
| Wild and Wave Ltd | Arts & recreation | 2020 |
| William Bradley Fencing Ltd | Administrative & support | 2025 |
| William LE Nails Ltd | Other services | 2023 |
| Williamsons Consultants Ltd | Professional & scientific | 2005 |
| Willow Isle Capital Mortgages Limited | Financial services | 2023 |
| Wilson Sound Ltd | Administrative & support | 2020 |
| Wilton Chartering Ltd | Transport & logistics | 2023 |
| Wines by Cellars Limited | Wholesale & retail | 2024 |
| Winford Estates Limited | Real estate | 2005 |
| Wintermere Estates Limited | Real estate | 2025 |
| Wizarpos UK and Europe Ltd | Wholesale & retail | 2025 |
| Wizz Kids Play Cafe Limited | Arts & recreation | 2018 |
| WMC Properties Ltd | Real estate | 2020 |
| Wolsey Group Limited | Administrative & support | 1999 |
| Wolsey Securities (Pontefract) Limited | Construction | 1993 |
| Wolsey Securities Limited | Construction | 1993 |
| Wonderway Travels Limited | Administrative & support | 2024 |
| Wong Zero Limited | Information & communication | 2016 |
| Woodell Consulting Limited | Professional & scientific | 2015 |
| Woodhaven Management Co. Limited | Households | 1986 |
| Woof Hero Holdings Ltd | Professional & scientific | 2025 |
| Wotcc Trading Limited | Arts & recreation | 2024 |
| WOW Factor Entertainment Ltd | Arts & recreation | 2009 |
| Wowder Limited | Wholesale & retail | 2020 |
| WRV Investments Ltd | Financial services | 2024 |
| Xale Limited | Agriculture & fishing | 2022 |
| Xorvane Ltd | Information & communication | 2025 |
| XUE Property Investments Limited | Real estate | 2025 |
| Y'S Homes Limited | Administrative & support | 2007 |
| Y.C.Sunni Limited | Real estate | 2017 |
| Yadavas Healthcare Ltd | Administrative & support | 2024 |
| Yiayia's Tavern Limited | Hospitality | 2023 |
| YJP International Limited | Financial services | 2019 |
| Yodaanimaldoctor Ltd | Professional & scientific | 2025 |
| Your Home Property Developments Ltd | Real estate | 2026 |
| Your Home Surrey Ltd | Construction | 2017 |
| Your IT Delivered Limited | Wholesale & retail | 2010 |
| Your MAN Limited | Extraterritorial | 1983 |
| Yourentacar.Co.Uk Limited | Administrative & support | 2014 |
| Z Commodities Limited | Other services | 2019 |
| Zaras Chauffeurs Ltd | Transport & logistics | 2025 |
| Zaras Group Investment Ltd | Real estate | 2023 |
| Zenith Global Solutions Limited | Professional & scientific | 2012 |
| Zenness Ltd | Construction | 2021 |
| Zkmd Foods Ltd | Hospitality | 2025 |
| ZM Solutions Limited | Hospitality | 2018 |
| Zooey Records Limited | Arts & recreation | 2007 |
| Zupod Solutions Limited | Information & communication | 2013 |
| Zyra Group Limited | Wholesale & retail | 2025 |
| Āadi Trading Ltd | Health & social care | 2019 |