| Westgate Management Consultancy Limited | Financial services | 2013 |
| Westgate Midco Limited | Other services | 2021 |
| Westhills Limited | Construction | 2003 |
| Westlecourt Limited | Professional & scientific | 1997 |
| Westmill Community Association | Other services | 2013 |
| Westminster Steels Limited | | 1976 |
| Weston Caravan Storage Limited | Extraterritorial | 2020 |
| Weston Retirement Livery Ltd | Agriculture & fishing | 2024 |
| Weston Rugby Football Club Limited | Arts & recreation | 2012 |
| Weston Store & PO Limited | Wholesale & retail | 2022 |
| Westonbrook Associates Limited | Administrative & support | 2026 |
| Westover Building Consultants LLP | | 2010 |
| WG O Mahony Security Consultancy Ltd | Administrative & support | 2020 |
| What Car Ltd | Wholesale & retail | 2024 |
| Whelan Building Consultancy Limited | Construction | 2004 |
| Whelan Plumbing and Heating Limited | Construction | 2024 |
| Whelan Wealth Management Limited | Financial services | 2010 |
| Whetstone Properties Limited | Households | 1959 |
| Whisper Mews (Luton) Management Company Limited | Administrative & support | 2003 |
| White Bear Swbg Bristol Ltd | Hospitality | 2022 |
| White Butterfly Developments Limited | Construction | 2022 |
| White Eagle Learning Limited | Professional & scientific | 2016 |
| White Orchid Property Relocation Ltd | Hospitality | 2021 |
| White Rhino Ventures Ltd | Financial services | 2023 |
| White Star Development Management Limited | Professional & scientific | 2005 |
| White's Independent Traders Limited | Extraterritorial | 2017 |
| Whitehill Close Limited | Real estate | 2016 |
| Whitehill Investments Ltd | Real estate | 2006 |
| Why&Food Ltd | Hospitality | 2020 |
| Wicked Mata Ltd | Wholesale & retail | 2019 |
| Wickham Engineering Limited | Manufacturing | 1998 |
| Wiffin Windows Limited | Construction | 2014 |
| Wiggy Hitchen Ltd | Hospitality | 2025 |
| Wilbury Medical & Aesthetics Ltd | Other services | 2023 |
| Wilbury Way Valeting Centre Ltd | Other services | 2016 |
| Wild in the Country Ltd | Arts & recreation | 2006 |
| Wild Minds World Limited | Other services | 2016 |
| Wilde Jewellery Ltd. | Wholesale & retail | 2019 |
| Wildly Social Media Limited | Professional & scientific | 2024 |
| Wilfinn Limited | Hospitality | 2021 |
| Williamoakproperties Ltd | Real estate | 2026 |
| Willianshop Ltd | Wholesale & retail | 2018 |
| Willis Jenkins Limited | Administrative & support | 2008 |
| Willow & Blossom Floral Design Ltd | Wholesale & retail | 2023 |
| Willow Consulting Ltd | Administrative & support | 2020 |
| Willow Court (Fenstanton) Management Company Limited | Households | 2018 |
| Willow Safety Group Limited | Professional & scientific | 2025 |
| WILLOW17 Limited | Professional & scientific | 2018 |
| Willwell Limited | Wholesale & retail | 2023 |
| Wilmond Engineering Co. Limited | Wholesale & retail | 1947 |
| Wilmond Limited | Real estate | 2002 |
| Windmill Estates LLP | | 2012 |
| Windmill Hill Management Company (Hitchin) Limited | Extraterritorial | 2007 |
| Wingfisher Limited | Information & communication | 2022 |
| Wings Logistics Ltd | Transport & logistics | 2026 |
| Winning Focus Limited | Professional & scientific | 2018 |
| Winter Park Holdings Limited | Agriculture & fishing | 2019 |
| Wire-In Communications Ltd | Wholesale & retail | 2024 |
| Wisniewscy Brodnica PL Ltd | Health & social care | 2025 |
| Wisterm Limited | Financial services | 2017 |
| Witech Consultancy Limited | Other services | 2010 |
| WJ Servicing Limited | Administrative & support | 2025 |
| Woburn Country Foods Limited | Wholesale & retail | 2001 |
| Woburn Forest Growers Ltd | Wholesale & retail | 2019 |
| Wokka Foods Ltd | Hospitality | 2023 |
| Wolf & Company Photography Ltd | Professional & scientific | 2020 |
| Womble Estates Ltd | Real estate | 2021 |
| Woodbridge Therapy Limited | Health & social care | 2014 |
| Woodcroft Management Company Limited | Households | 1989 |
| Woodland Residential Care Home Limited | Health & social care | 2011 |
| Woodmaster Joinery Limited | Extraterritorial | 2012 |
| Woodside Veterinary Services Ltd | Real estate | 2009 |
| Woodstock RTM Company Limited | Households | 2013 |
| Woodthorpe IT Solutions Limited | Information & communication | 2005 |
| Wookietech Ltd | Information & communication | 2023 |
| Woolley Engineering Limited | Wholesale & retail | 2023 |
| Worcester Architects Hertfordshire Limited | Professional & scientific | 2026 |
| Words by Lucy Limited | Information & communication | 2022 |
| Wordsure Limited | Administrative & support | 2009 |
| World Precision Instruments Limited | Manufacturing | 1989 |
| Worldwide CP Ltd | Professional & scientific | 2025 |
| Worldwide Lifting Solutions Limited | Other services | 2019 |
| Wpgb Studio Ltd | Information & communication | 2024 |
| Wptc UK Limited | Professional & scientific | 2025 |
| Wrappdup Ltd | Wholesale & retail | 2019 |
| WRC EC Sandwell Limited | Hospitality | 2023 |
| Wrest Park Lodge Management Company Limited | Households | 1998 |
| Wrest Park Tutors LLP | | 2026 |
| Wripple Limited | Professional & scientific | 2024 |
| WRV EC Cardiff Ltd | Hospitality | 2023 |
| WRV EC Holding Company Ltd | Financial services | 2023 |
| WRV EC SW Ltd | Hospitality | 2023 |
| WRV EC WM Ltd | Hospitality | 2023 |
| WSM Elevators Ltd | Other services | 2017 |
| Wsto Limited | Financial services | 2021 |
| WSW Projects Limited | Construction | 2008 |
| WTA Holdings Ltd | Real estate | 2022 |
| WTA Properties Limited | Real estate | 2016 |
| WTA Ventures Ltd | Real estate | 2023 |
| Wtauk Ltd | Real estate | 2016 |