| Windmill Building Services UK Limited | Wholesale & retail | 2015 |
| Windmill Catering Company Limited | Hospitality | 2025 |
| Windmill Close Management Limited | Households | 2014 |
| Windmill Tavern Gravesend Limited | Hospitality | 2024 |
| Window Projects (South East) Ltd | Construction | 2019 |
| Windows With a View Glass & Glazing Ltd | Construction | 2023 |
| Wings of Chelsea Ltd | Administrative & support | 2025 |
| Winn Real Estate Ltd | Real estate | 2025 |
| Winnway TM Limited | Administrative & support | 2025 |
| Wintrad Ltd | Wholesale & retail | 1996 |
| Wisdom Interiors Ltd | Construction | 2025 |
| Wisdom Mechanics Ltd | Wholesale & retail | 2020 |
| Wisdom of the Crowd Ltd | Information & communication | 2024 |
| Wise Properties Ltd | Real estate | 2013 |
| Wisteria Hair & Beauty Spa Ltd | Real estate | 2013 |
| Wizzquest Ltd | Education | 2026 |
| WJ Fire Safety Limited | Public administration | 2021 |
| WJ Haulage Ltd | Transport & logistics | 2019 |
| WJ Umbrella Limited | Information & communication | 2020 |
| WJS Drainage Limited | Administrative & support | 2018 |
| WJT Consultants Ltd | Other services | 2020 |
| WL Facility Management Ltd | Professional & scientific | 2024 |
| WM Events Ltd | Professional & scientific | 2015 |
| WMB Mario Transport Ltd | Transport & logistics | 2025 |
| WNH Consultants Limited | Information & communication | 2012 |
| Woikambai Limited | Other services | 2018 |
| WOK a Way Cuisine Ltd | Hospitality | 2018 |
| Woke Healthcare Ltd | Health & social care | 2010 |
| Women of Faith CIC | Administrative & support | 2021 |
| Wonder Things Ltd | Wholesale & retail | 2023 |
| Wonderful Content Limited | Professional & scientific | 2014 |
| Wonderland Works Ltd | Professional & scientific | 2026 |
| Wonders of Fashion Ltd | Real estate | 1993 |
| Woodfall Residents Association Limited | Households | 1986 |
| Woodform Studio Ltd | Manufacturing | 2025 |
| Woodlands Park Bowling Club Limited | Arts & recreation | 1997 |
| Woodrow Worldwide Limited | Other services | 2019 |
| Woods & Whitfield Investments Limited | Real estate | 2020 |
| Woodsmith's Joinery Ltd | Construction | 2023 |
| Woodstock Road Residents Association Limited | Households | 1985 |
| Woodview Homes and Developments Limited | Administrative & support | 2018 |
| Woodwright Construction Limited | Manufacturing | 2006 |
| Woolwich Road Investments Ltd | Real estate | 2025 |
| Workplace by Goldex Limited | Other services | 2022 |
| Worksafe Support Ltd | Professional & scientific | 2022 |
| Workstream Systems Ltd | Information & communication | 2026 |
| Workstructure Ltd | Real estate | 2017 |
| World Concept VS Ltd | Wholesale & retail | 2025 |
| Wounded Healer Limited | Real estate | 2023 |
| Wraich Transports Ltd | Transport & logistics | 2021 |
| Wrife Education Limited | Education | 2025 |
| Wscommunication Ltd | Wholesale & retail | 2025 |
| WTC London Limited | Construction | 2026 |
| Wunmibnk Properties Ltd | Real estate | 2024 |
| Wycliffe House Residents Association Limited | Households | 1990 |
| X-Country Logistics Limited | Transport & logistics | 2021 |
| Xclamations Ltd | Wholesale & retail | 2021 |
| Xencore (UK) Limited | Professional & scientific | 2008 |
| XGX Transport Ltd | Transport & logistics | 2022 |
| Xhaferi Limited | Transport & logistics | 2025 |
| Xieta Ltd | Professional & scientific | 2026 |
| XIX Club South East Ltd | Other services | 2022 |
| XL@ Group Limited | Financial services | 2018 |
| XL@ Property Limited | Real estate | 2020 |
| Xmax Services Ltd | Transport & logistics | 2019 |
| Xpert Banking Furniture Limited | Manufacturing | 2005 |
| Xpert Engineering Limited | Extraterritorial | 1998 |
| Xplor UK Ltd. | Information & communication | 2015 |
| Xydistributors Ltd | Wholesale & retail | 2024 |
| Xylonford Ltd | Real estate | 2026 |
| Y Tech Ltd | Transport & logistics | 2020 |
| Y12 Construction Ltd | Construction | 2023 |
| Yadgar Ltd | Households | 2025 |
| Yang's Deli Company Limited | Hospitality | 2025 |
| Yaqub Curry Ltd | Hospitality | 2024 |
| YBU4 Solutions Ltd | Health & social care | 2024 |
| Ycysabandonedwares Ltd | Wholesale & retail | 2026 |
| Yellow Badger Ltd | Water & waste | 2018 |
| Yellow Brick Road Consultants Limited | Professional & scientific | 2024 |
| Yemjac Limited | Health & social care | 2019 |
| Yemtol Limited | Construction | 2016 |
| Yfus Solutions Ltd | Information & communication | 2026 |
| YH Drivers Ltd | Transport & logistics | 2024 |
| Yinks Global Limited | Wholesale & retail | 2021 |
| Yinks Global Properties Limited | Real estate | 2025 |
| Yiwa Corporation Ltd | Extraterritorial | 2024 |
| YJK Electrical Ltd | Information & communication | 2017 |
| Ylzl Consulting Limited | Information & communication | 2024 |
| Ynotcheaper Ltd | Wholesale & retail | 2019 |
| Yomlad Limited | Transport & logistics | 2018 |
| Young Entrepreneurs Support CIC | Administrative & support | 2025 |
| Youngs Agricultural Contracting Services Ltd | Agriculture & fishing | 2017 |
| Youngs Electrical (UK) Ltd | Other services | 2009 |
| Younis Empire Ltd | Real estate | 2024 |
| Your Beautiful Day Ltd | Other services | 2010 |
| Your Body Evolution Ltd | Other services | 2024 |
| Your Local Auctioneer Ltd | Real estate | 2025 |
| Your Moment Photobooth Ltd | Other services | 2024 |
| Your New Floor Limited | Construction | 2023 |
| Your Utopia Room Limited | Construction | 2018 |