| Wanna BEE Free Services Ltd | Health & social care | 2026 |
| Warda Dental Laboratory Ltd | Health & social care | 2014 |
| Warm Hearts Care Limited | Health & social care | 2024 |
| Warm on Ltd | Construction | 2023 |
| Warmor Trading Limited | Wholesale & retail | 2017 |
| Warmwell Homes LLP | | 2017 |
| Warspite Woolwich Limited | Real estate | 2017 |
| Wasimi Care Ltd | Health & social care | 2026 |
| Water Dispenser and Hydration Association Limited | Other services | 1997 |
| Waterman Creative Limited | Manufacturing | 2023 |
| Watermead Court (Oakwood) Management Company Limited | Households | 2003 |
| Wayne T Actuarial Ltd | Professional & scientific | 2022 |
| WD Glaze Limited | Construction | 2025 |
| Wd.Motorcycles. Ltd | Wholesale & retail | 2025 |
| WE Buy Motors Limited | Wholesale & retail | 2015 |
| WE Find Your Ideal Car Limited | Other services | 2018 |
| Wealden Surfaces Limited | Construction | 2023 |
| Wealth With Sadia Limited | Professional & scientific | 2023 |
| Webb Contracts Ltd | Administrative & support | 2017 |
| Webheads Ltd | Professional & scientific | 2025 |
| Weekday Swim Ltd | Arts & recreation | 2016 |
| Weekend Wasters Limited | Water & waste | 2025 |
| Wel-Led Limited | Health & social care | 2019 |
| Weldon Court Management Company Limited | Households | 1971 |
| Well and Beyond Ltd | Health & social care | 2023 |
| Wellbeing Footcare Ltd | Health & social care | 2021 |
| Wentforth Hill Limited | Financial services | 2023 |
| West East Global Limited | Wholesale & retail | 2021 |
| West One Property Maintenance Limited | Professional & scientific | 1983 |
| Westgate Court (Waltham Cross) Management Company Limited | Households | 1989 |
| Westmore Pacific Ltd | Real estate | 2022 |
| WG Media Limited | Other services | 2009 |
| Wheeler Risk Solutions Ltd | Financial services | 2024 |
| White Elephant Operations Limited | Financial services | 2020 |
| White Elephant Operations One Limited | Financial services | 2020 |
| White Elephant Operations Two Limited | Financial services | 2020 |
| White Elephant Properties Limited | Financial services | 2020 |
| White Elephant Properties One Limited | Financial services | 2020 |
| White Elephant Properties Three Limited | Financial services | 2020 |
| White Elephant Properties Two Limited | Financial services | 2020 |
| Whitebox Catering Ltd | Hospitality | 2022 |
| Whitefield Food & Wine Limited | Wholesale & retail | 2017 |
| Whitefields (Cheshunt) Limited | Health & social care | 2003 |
| Whitley Landscape Ltd | Administrative & support | 2025 |
| Whitt Events Limited | Hospitality | 2019 |
| Whittingtons Holdings Limited | Wholesale & retail | 2022 |
| Whyman Holdings Ltd | Administrative & support | 2024 |
| WIC Worldcom International Communications Ltd | Information & communication | 2010 |
| Wickman Properties Limited | Real estate | 2021 |
| Wildflower Network Community Interest Company | Other services | 2023 |
| Will Cruse Holdings Ltd | Financial services | 2022 |
| Willow Tiles Limited | Manufacturing | 2011 |
| Wimborne House Corporation Ltd | Wholesale & retail | 2014 |
| Winchesters Property (SET) Ltd | Construction | 2007 |
| Winchesters Property Solutions (Euro) Ltd | Real estate | 2003 |
| Windmill Lane Management Limited | Extraterritorial | 1995 |
| Winston Construction Limited | Construction | 2013 |
| Wire Eighty Five Ltd | Real estate | 2021 |
| Wire NOW Ltd | Construction | 2025 |
| Wise Mortgage Solutions Ltd | Financial services | 2018 |
| Wisestar Limited | Real estate | 2016 |
| Within Ltd | Professional & scientific | 2018 |
| Without Walls Ministries | Other services | 2016 |
| Wmch LLP | | 2013 |
| Wolf Abbey Limited | Real estate | 2024 |
| Wolf and Lamb Corporate Limited | Hospitality | 2024 |
| Wolfe Associates Ltd | Professional & scientific | 2022 |
| Wollyroots Holistic Hair Care Limited | Other services | 2025 |
| Woodgreen Corner Ltd | Hospitality | 2023 |
| Woodman Catering Ltd | Hospitality | 2024 |
| Woods Commercial Property Ltd | Real estate | 2025 |
| Woodside Development & Property Solutions Ltd | Construction | 2025 |
| Woodside Development & Sons Limited | Construction | 2021 |
| Woodstock Management Limited | Real estate | 2017 |
| Woosh Bang ENT Limited | Information & communication | 2024 |
| Words of Life and Health Limited | Information & communication | 2005 |
| Work Safety Boat Limited | Construction | 2013 |
| Worldwide Property Services Limited | Real estate | 2018 |
| WP Visual Signs & Graphics Ltd | Information & communication | 2014 |
| WRS 88 Ltd | Wholesale & retail | 2026 |
| Wuhld Limited | Information & communication | 2025 |
| WW Agency Limited | Wholesale & retail | 2020 |
| WW Treecare Ltd | Administrative & support | 2026 |
| WX Properties Limited | Real estate | 2019 |
| Xirtiz Health Tourism Ltd | Health & social care | 2024 |
| XJC Analytics Limited | Professional & scientific | 2014 |
| XON Energy Ltd | Extraterritorial | 2010 |
| Xtra DAB Limited | Information & communication | 2023 |
| Xtra Media Group Ltd | Information & communication | 2021 |
| Y&S Estates Limited | Real estate | 2022 |
| Yacht Survey Partners Limited | Professional & scientific | 2021 |
| Yali Restaurant Limited | Hospitality | 2025 |
| Yanmaz Limited | Hospitality | 2025 |
| Yawehneez Enterprises Limited | Extraterritorial | 2001 |
| Yayla Meat Ltd | Wholesale & retail | 2020 |
| Yedo Limited | Real estate | 2024 |
| Yelken Cakes Ltd | Hospitality | 2026 |
| Yellow Cat and Kitten Limited | Real estate | 2026 |
| YES - Your Electrical Safe Ltd | Construction | 2025 |
| Yesod Ltd | Hospitality | 2019 |