| Walcom Limited | Administrative & support | 2003 |
| Wallitt Consultancy Ltd | Information & communication | 2026 |
| Walmontox (Wellington Crescent) Limited | Real estate | 2022 |
| Walnut Partners Limited | Other services | 2013 |
| Walton House Dental Practice Limited | Health & social care | 2009 |
| Wama Brothers Consulting Ltd | Professional & scientific | 2022 |
| Wanstead Osteopaths Limited | Health & social care | 2014 |
| Waring Investments Limited | Real estate | 1958 |
| Warren Sharpe Associates Limited | Professional & scientific | 2000 |
| Water Stone Plumbers Ltd | Construction | 2011 |
| Waterfront Properties Limited | Real estate | 2018 |
| Watford Gymnastics Club Ltd | Education | 2020 |
| Watford Transfer Recycling & Skip Hire Limited | Extraterritorial | 2002 |
| Wavemill Healthcare Ltd | Administrative & support | 2021 |
| WE ARE Chums Limited | Manufacturing | 2025 |
| Weard Management Limited | Professional & scientific | 2025 |
| Webb’S Property Maintenance Limited | Construction | 2021 |
| Wecelebrate Ltd | Professional & scientific | 2018 |
| Welcote Limited | Households | 2008 |
| Wellness Worldwide Ltd | Professional & scientific | 2024 |
| Wembley Stallions American Football Club Limited | Arts & recreation | 2014 |
| West END News Ltd | Wholesale & retail | 2016 |
| West Lodge School Suffolk Ltd | Education | 2019 |
| West London Postgraduate Medical School Limited | Education | 2010 |
| West Quay Consulting Limited | Professional & scientific | 2022 |
| Westbourne Apartments Ltd | Households | 1946 |
| Westwood Lettings & Management Limited | Real estate | 2010 |
| Weyx IT Limited | Information & communication | 2016 |
| Whisky Allure Limited | Wholesale & retail | 2015 |
| White Bird Investments Limited | Hospitality | 2012 |
| White House Dental Practice Limited | Health & social care | 2023 |
| Whyq Limited | Information & communication | 2012 |
| Wildacre Woods Ltd | Construction | 2022 |
| Wildacres Northwood Management Company Limited | Real estate | 2000 |
| Wildflower Estates Ltd | Real estate | 2017 |
| Wildflower Holdings Ltd | Real estate | 2019 |
| Willis Motor Company Limited | Professional & scientific | 1991 |
| Willis Properties (Harrow) Limited Liability Partnership | | 2008 |
| WIN Films Limited | Information & communication | 2011 |
| Windmill Cross Developments Limited | Real estate | 2004 |
| Winterrishon Properties Limited | Real estate | 2023 |
| Wiseman FO Limited | Administrative & support | 2025 |
| WIT Consult Group Ltd | Information & communication | 2023 |
| WJ Property Law Limited | Professional & scientific | 2017 |
| Wolsey Moor Limited | Financial services | 2025 |
| Woodcote Investment Holdings Ltd | Financial services | 2021 |
| Woodfloor Martins Limited | Construction | 2015 |
| Woodland Heights Management Company Limited | Households | 2002 |
| Woodland Timber Merchant Ltd | Wholesale & retail | 2024 |
| Woodlark Publishing Limited | Information & communication | 2019 |
| Woodlodge Montessori School (UK) Ltd | Education | 2011 |
| Woodlodge Properties Ltd | Real estate | 2019 |
| Woodsman Court RTM Company Limited | Households | 2020 |
| Workwise Training Limited | Transport & logistics | 2013 |
| World Leisure Services Ltd. | Arts & recreation | 1996 |
| World Pool Systems Ltd | Arts & recreation | 2022 |
| WPM Centre Limited | Health & social care | 2014 |
| Wrap Party Limited | Professional & scientific | 2023 |
| Wrkn LLP | | 2023 |
| WSA Consultants Limited | Professional & scientific | 2015 |
| WTW Property Limited | Real estate | 2026 |
| WVC Ltd | Administrative & support | 2022 |
| Wykes Consulting Ltd | Professional & scientific | 2020 |
| X Press DRY Cleaners Ltd | Other services | 2020 |
| Xdmiah Limited | Wholesale & retail | 2025 |
| Xklusivelyelite Ltd | Information & communication | 2025 |
| XO Properties Limited | Real estate | 2023 |
| Xpark Hotel Ltd | Hospitality | 2019 |
| XPK Ltd | Professional & scientific | 2022 |
| Xplora International Limited | Education | 2017 |
| Xpsbargains Limited | Wholesale & retail | 2018 |
| Y Secure Limited | Wholesale & retail | 2016 |
| YAD Investments Ltd | Real estate | 2019 |
| Yahoo Solutions Ltd | Construction | 2024 |
| YAN YEE Limited | Hospitality | 2019 |
| Yantravikasa Limited | Information & communication | 2023 |
| YAU LEY Limited | Hospitality | 2017 |
| Yellow Submarine Consulting Limited | Administrative & support | 2019 |
| YFC Ltd | Information & communication | 2024 |
| YNR Properties Ltd | Real estate | 2019 |
| Yojak Group Limited | Professional & scientific | 2024 |
| Yoko Beauty London Ltd | Other services | 2026 |
| Your Living Space Ltd | Professional & scientific | 2017 |
| Your Urban Space Ltd | Real estate | 2018 |
| YP2 SPV1 Limited | Real estate | 2025 |
| YQ Properties Limited | Real estate | 2022 |
| Yunman (UK) Ltd | Health & social care | 2012 |
| Yuvitrade Limited | Administrative & support | 2025 |
| Z Haider Medical Limited | Health & social care | 2012 |
| Zain Properties Ltd | Real estate | 2007 |
| Zainhas Limited | Health & social care | 2023 |
| Zakn Investments Limited | Professional & scientific | 2026 |
| Zanara Court Limited | Real estate | 2018 |
| Zanara Limited | Real estate | 2001 |
| Zapico Properties Limited | Real estate | 2019 |
| Zaveri Investments Limited | Real estate | 2023 |
| Zayvier Holdings Ltd | Real estate | 2025 |
| Zednative Limited | Professional & scientific | 2024 |
| Zedoptima Limited | Professional & scientific | 2024 |
| Zeena and Roots Ltd | Wholesale & retail | 2026 |