| Weston Court Management Company Limited | Households | 1985 |
| Westward HO Adventure Holidays Limited | Other services | 1966 |
| Wexwood Flats Limited | Real estate | 2024 |
| WH Services Ltd | Health & social care | 2017 |
| Wham Media Ltd | Professional & scientific | 2006 |
| What a Catch Ltd | Hospitality | 2025 |
| What Happens in Limited | Arts & recreation | 2025 |
| What IF IT Barks Films Limited | Information & communication | 2014 |
| What's Your View Ltd | Professional & scientific | 2007 |
| Whayman Real Estate Consultancy Ltd | Administrative & support | 2011 |
| Where Caring Matters (1974) Limited | Health & social care | 2015 |
| Wheston Lodge (Freehold) Limited | Households | 2013 |
| Whetstone Square Residents' Management Company Limited | Households | 2019 |
| White Duck UK Limited | Wholesale & retail | 2020 |
| White Hall Lending Ltd | Financial services | 2018 |
| White Herts Loft Rooms Ltd | Construction | 2019 |
| White House (Clapton) Limited | Real estate | 1963 |
| White Nitro Ltd | Other services | 2020 |
| White Spore Limited | Information & communication | 2011 |
| Whitebread Ltd | Information & communication | 2019 |
| Whitefax Limited | Real estate | 2018 |
| Whitegates RTM Company Limited | Households | 2024 |
| Whitehall Capital 1 Ltd | Financial services | 2022 |
| Whitehall Capital 2 Ltd | Financial services | 2025 |
| Whitehall Capital SPV Ltd | Financial services | 2024 |
| Whitehall Loans 1 Ltd | Financial services | 2022 |
| Whitehall Loans Limited | Households | 2019 |
| Whitelocke LLP | | 2026 |
| Whizamet Services LLP | | 2019 |
| Wholesale Packaging Limited | Wholesale & retail | 2004 |
| Whoosh FX Ltd | Arts & recreation | 2023 |
| Whyte Rabbit Ltd | Information & communication | 2024 |
| Whyteleap Limited | Professional & scientific | 2025 |
| Whytelion Ltd. | Arts & recreation | 2013 |
| WIA Solutions UK Ltd | Administrative & support | 2024 |
| WIA Systems Ltd | Information & communication | 2019 |
| Wicked Gummy Co. Ltd. | Wholesale & retail | 2018 |
| Wide Beam 32 Limited | Information & communication | 2017 |
| Wight Games Festival CIC | Arts & recreation | 2026 |
| Wight Proms Limited | Arts & recreation | 2018 |
| Wild OWL LLP | | 2024 |
| Wilde Accommodation Ltd | Hospitality | 2024 |
| Wilde SMC Ltd | Professional & scientific | 2022 |
| Wilde VFX Limited | Information & communication | 2022 |
| Wildefeast Limited | Hospitality | 2014 |
| Wildflower & Weave Ltd | Wholesale & retail | 2025 |
| Wildly Improbable Limited | Administrative & support | 2026 |
| Wildwood Film Production Ltd | Information & communication | 2022 |
| Wilfred Paradine Productions Ltd | Information & communication | 2021 |
| William Thompson Homes (Horns Road) Limited | Construction | 2020 |
| Willow Court RTM Company Limited | Administrative & support | 2010 |
| Willow House Dental Surgery Limited | Health & social care | 2015 |
| Wills Knowles Ltd | Arts & recreation | 2019 |
| Willu FX Limited | Professional & scientific | 2017 |
| Willu Holdings Limited | Financial services | 2018 |
| Willu Independent Limited | Financial services | 2018 |
| Willu Insure Limited | Financial services | 2021 |
| Willu Invest Limited | Financial services | 2015 |
| Willu Life Limited | Professional & scientific | 2019 |
| Willu Wills Limited | Other services | 2022 |
| Winawood Limited | Wholesale & retail | 2014 |
| Windcade Limited | Professional & scientific | 2019 |
| Windsor Gynaecology and Fertility Limited | Health & social care | 2012 |
| Windsor House Management Company (RTM) Limited | Professional & scientific | 2004 |
| Windsor Stag Properties Limited | Administrative & support | 2016 |
| Wines of the Weald Ltd | Manufacturing | 2020 |
| Wing Asylum Ltd | Wholesale & retail | 2022 |
| Wingate Stadium Limited | Real estate | 1977 |
| Wingmans Chicken Restaurants Limited | Hospitality | 2018 |
| Winnie Productions Limited | Information & communication | 2021 |
| Wire FX Limited | Financial services | 2025 |
| WIS Accountancy Ltd | Professional & scientific | 2009 |
| WIS Umbrella Ltd | Administrative & support | 2018 |
| Wise Jasmine Group Ltd | Real estate | 2017 |
| Wise Jasmine Investment Ltd | Real estate | 2020 |
| WIT Fitness Limited | Wholesale & retail | 2014 |
| Wize Professionals Ltd | Professional & scientific | 2016 |
| Wizo.Uk | Health & social care | 2008 |
| Wjmp Ltd | Health & social care | 2016 |
| WJT Standby Ltd | Information & communication | 2022 |
| Wlhs Holdings Ltd | Financial services | 2026 |
| Wlsc Services Limited | Information & communication | 2015 |
| WMC Group Ltd | Construction | 2016 |
| Wmhbcreative Ltd | Arts & recreation | 2018 |
| WMP Global Limited | Arts & recreation | 2021 |
| WNA Accountants Ltd | Professional & scientific | 2017 |
| Woburn Sands Chiro Clinic - AMI Group Ltd | Health & social care | 2025 |
| Woleh Ltd | Information & communication | 2022 |
| Wolfegang Limited | Administrative & support | 2013 |
| Women Health Solutions PVT Ltd | Health & social care | 2018 |
| Women of Valour Int'L Limited | Health & social care | 2023 |
| Wood Brewery Limited(The) | Manufacturing | 1981 |
| Wood CUT Pictures Limited | Information & communication | 2017 |
| Woodal Investments Limited | Extraterritorial | 2013 |
| Woodfield Road Management Limited | Households | 2009 |
| Woodhall Films Limited | Information & communication | 2014 |
| Woodland Environmental Limited | Construction | 2018 |
| Woodlands Park Healthcare Limited | Wholesale & retail | 2022 |
| Woodvine Media Ltd | Information & communication | 2014 |
| Woodys Services Ltd | Construction | 2025 |