| Wecanaccess Ltd | Information & communication | 2018 |
| Wedding Smashers Disque Limited | Other services | 2013 |
| Welch Properties Limited | Real estate | 2017 |
| Well Connected Electrics UK Limited | Construction | 2013 |
| Well Social CIC | Arts & recreation | 2024 |
| Wellestone Ltd | Manufacturing | 2016 |
| Welling MSP Group Limited | Financial services | 2021 |
| Welling MSP Ltd | Professional & scientific | 2014 |
| Wengm Consulting Limited | Administrative & support | 2015 |
| Wensum Dental Laboratory Limited | Health & social care | 2019 |
| Wensum Dental Practice Limited | Health & social care | 2008 |
| Wenty Finance Ltd | Real estate | 2025 |
| West Dental Care Limited | Health & social care | 2010 |
| West Street Nutrition Limited | Health & social care | 2026 |
| Westbrook Property Services Limited | Real estate | 2022 |
| Westbury Holdings Ltd | Real estate | 2015 |
| Westbury Living Limited | Real estate | 2024 |
| Western Court RM1 Limited | Households | 2015 |
| Western Trading Supplies Limited | Wholesale & retail | 2025 |
| Westham Best Kebab Ltd | Hospitality | 2026 |
| Westlaker Consulting Ltd | Information & communication | 2022 |
| Westlee Services Ltd | Financial services | 2022 |
| Weta Buildings Ltd | Construction | 2017 |
| Whale Star Limited | Information & communication | 2009 |
| What AI Limited | Professional & scientific | 2026 |
| Whataday Limited | Professional & scientific | 1999 |
| Whatnot Pictures Ltd | Information & communication | 2018 |
| Wheel Traders Limited | Wholesale & retail | 2008 |
| Wheeler Property Limited | Real estate | 2024 |
| Whelan Estates Management Limited | Real estate | 2022 |
| Whelan Holdings Limited | Real estate | 2018 |
| Whelan Management Limited | Hospitality | 2020 |
| Whelan Property Holding Limited | Hospitality | 2022 |
| Whippedco Ltd | Hospitality | 2025 |
| Whisper Maternité Ltd | Health & social care | 2025 |
| Whistle & Ride Management Limited | Arts & recreation | 2020 |
| White Knight Computer Services Limited | Information & communication | 2000 |
| White Rose Restaurant Ltd | Hospitality | 2018 |
| Whitebeard Accounting & Bookkeeping Ltd | Professional & scientific | 2023 |
| Whitegate Property Ltd | Real estate | 2025 |
| Whitegates (Essex) Limited | Extraterritorial | 1999 |
| Whitepost Estates Limited | Construction | 1999 |
| Wickford Homes Limited | Real estate | 2010 |
| Widc Ltd | Information & communication | 2019 |
| Wide World Supplier Limited | Wholesale & retail | 2019 |
| Widemouth Bay Holiday Village Limited | Hospitality | 2022 |
| Wiggy Designs Limited | Wholesale & retail | 2021 |
| Wiggy Services Limited | Administrative & support | 2009 |
| Wild Angels Bridal Ltd | Wholesale & retail | 2023 |
| Wild Meadow Honey Products Limited | Wholesale & retail | 2025 |
| Wildheart Promotions Limited | Arts & recreation | 2018 |
| Will I AM London Properties Limited | Real estate | 2020 |
| Will I AM Plumbing & Heating Limited | Construction | 2014 |
| Willem J Botha Limited | Health & social care | 2014 |
| Willflo Global Care Recruitment Limited | Administrative & support | 2022 |
| Williams Mortgage Solutions Limited | Financial services | 2020 |
| Willis Wheels Limited | Wholesale & retail | 2023 |
| Willowherb Realty Limited | Real estate | 2026 |
| Wilson Bush Electrical Contractors Limited | Construction | 2005 |
| Wilson Mechanical Ltd | Construction | 2023 |
| Wimpy Hornchurch Limited | Hospitality | 2018 |
| Wimpy Southend Limited | Hospitality | 2018 |
| Windmill Cross Limited | Professional & scientific | 2024 |
| Window & Conservatory Maintenance Limited | Construction | 2003 |
| Window Shopfront Shutters (W.S.S) Ltd | Manufacturing | 2024 |
| Wingardium Limited | Professional & scientific | 2026 |
| Wingletye Food and Wine Limited | Wholesale & retail | 2019 |
| Wingrove Contractors Limited | Construction | 1994 |
| Winners Real Estate Limited | Real estate | 2007 |
| Winnico Ltd | Real estate | 2012 |
| Wintry Wood Carpentry Ltd | Manufacturing | 2021 |
| Wired UP Electrical Limited | Construction | 2024 |
| Wisdom Education UK Limited | Education | 2012 |
| Wise Model Ltd | Wholesale & retail | 2023 |
| Wivenhoe Faceplace Limited | Other services | 2010 |
| WJ Property Holdings Limited | Real estate | 2022 |
| WMK Sidhu Ltd | Transport & logistics | 2024 |
| Woburn Software Solutions Ltd | Information & communication | 2019 |
| WOK District Ltd | Hospitality | 2026 |
| Woltag Cleaning Services Ltd | Administrative & support | 2008 |
| Wonderful Work Ltd | Administrative & support | 2013 |
| Wonderland Creative Studios Limited | Professional & scientific | 2025 |
| Wood Jobs Ltd | Construction | 2019 |
| Wood Tecq Ltd | Construction | 2008 |
| Woodenstile Ltd | Construction | 2024 |
| Woodfines (Emerson Park) Maintenance Limited(The) | Real estate | 1978 |
| Woodford Residential Limited | Real estate | 2018 |
| Woodfords Hair Ltd | Other services | 2026 |
| Woodland Bakery Ltd | Manufacturing | 2013 |
| Woodpool Limited | Financial services | 1991 |
| Woodruff Consulting Ltd | Administrative & support | 2021 |
| Works of Wellbeing Limited | Health & social care | 2025 |
| World Free Press Ltd | Professional & scientific | 2025 |
| World Wide Tours Ltd | Administrative & support | 2020 |
| Worldwide Cargo Logistics Ltd | Transport & logistics | 2025 |
| Worley Belle Limited | Health & social care | 2017 |
| Worth Working Logistics Ltd | Transport & logistics | 2026 |
| Wracko Ltd | Construction | 2020 |
| WRD Security Limited | Administrative & support | 2015 |
| Wrigglers Ltd | Other services | 2020 |