| Woodcroft Consulting Services Limited | Professional & scientific | 2019 |
| Wooden Heart Warehouse Limited | Manufacturing | 1982 |
| Woodfields Property Management Limited | Households | 2018 |
| Woodhall Court (Sevenoaks) Limited | Hospitality | 1987 |
| Woodhams Court Limited | Construction | 2013 |
| Woodland (Chevening Lane North) Limited | Households | 2015 |
| Woodlands Estate Management Company Limited | Professional & scientific | 1982 |
| Woodlands Management Company (Kent) Ltd | Households | 2013 |
| Woodlets Sevenoaks Limited | Real estate | 2015 |
| Woodside Advisory Limited | Professional & scientific | 2025 |
| Woodside Private Road Limited | Households | 1959 |
| Woodtrail Limited | Professional & scientific | 2023 |
| Woodview Contract Services Ltd | Administrative & support | 2026 |
| Workforce People and Data Ltd | Administrative & support | 2024 |
| Workshop & SET Plastering Limited | Construction | 2021 |
| Worktall Ltd | Manufacturing | 2016 |
| World of Events Limited | Information & communication | 2017 |
| Worldwide Asset Management (Freeholds) Ltd | Real estate | 2023 |
| Worldwide Centre of Cognitive Excellence Limited | Information & communication | 2023 |
| Worldwide Expo Ltd | Administrative & support | 2007 |
| Worldwide Travel Ideas Limited | Administrative & support | 2023 |
| Worldwide Travel Luggage & Bags Limited | Wholesale & retail | 2023 |
| Worlebury Consulting Services Limited | Administrative & support | 2018 |
| Worxblox Ltd | Manufacturing | 2016 |
| WOT Builds Ltd | Manufacturing | 2016 |
| Wotan Capital LLP | | 2009 |
| Wowment Ltd | Information & communication | 2021 |
| Woxon Limited | Professional & scientific | 2004 |
| WR M&E Ltd | Manufacturing | 2024 |
| Wrenchkings Ltd | Wholesale & retail | 2022 |
| Wright Procurement Ltd | Professional & scientific | 2024 |
| Write-Trak Limited | Education | 1997 |
| WRL 99 Limited | Professional & scientific | 2018 |
| Wrotham Heath Golf Club Limited | Arts & recreation | 2014 |
| Wrotham Hill Properties Limited | Real estate | 2023 |
| Wrotham Tuition Centre Ltd | Education | 2019 |
| Wsbc Building Contractors Ltd | Construction | 2020 |
| WTC Construction Limited | Construction | 2006 |
| Wuxian Trading Co LLP | | 2024 |
| WY (Brands Hatch) Limited | Hospitality | 1999 |
| WY (Chilston Park) Limited | Hospitality | 1999 |
| WY (Ettington Park) Limited | Hospitality | 1999 |
| WY (L'Horizon) Limited | Hospitality | 1999 |
| WY (Nutfield Priory) Limited | Hospitality | 1999 |
| WY (Priest House) Limited | Professional & scientific | 1999 |
| WY (Rookery Hall) Limited | Hospitality | 1999 |
| WY (Wood Hall) Limited | Hospitality | 1999 |
| WY (Woodland Park) Limited | Hospitality | 1999 |
| Wych Cross Nurseries Limited | Wholesale & retail | 2019 |
| Wynnbiz Ltd | Information & communication | 2021 |
| Wysic Ltd | Financial services | 2020 |
| Wyvo Limited | Wholesale & retail | 2024 |
| X-Breed Films Limited | Information & communication | 2012 |
| X24 Events & Entertainment Ltd | Hospitality | 2024 |
| X3 REA Accounting Ltd | Professional & scientific | 2012 |
| Xanbika Ltd | Professional & scientific | 2025 |
| Xecute Services Limited | Extraterritorial | 2009 |
| XIE Trading Ltd | Education | 2019 |
| XLX Group Ltd | Construction | 2024 |
| XLX Sevenoaks Ltd | Construction | 2024 |
| XMO Capital Ltd | Professional & scientific | 2025 |
| Xpertfees Collections Ltd | Administrative & support | 2025 |
| Y & M Care Ltd | Health & social care | 2018 |
| Y & M Care Westcott Ltd | Health & social care | 2023 |
| Y & M Care Wray Common Ltd | Health & social care | 2025 |
| Y & M UK Properties Limited | Real estate | 2021 |
| Yaldam Developments Ltd | Extraterritorial | 2024 |
| Yaldam Homes Ltd | Construction | 2024 |
| Yaldham Woodland Management Ltd | Agriculture & fishing | 2022 |
| Yard Seeker Ltd | Administrative & support | 2024 |
| Yarka Ltd | Financial services | 2026 |
| Yaseen Hair Dressers Ltd | Other services | 2023 |
| Yaweh Property Ltd | Real estate | 2020 |
| YD Music Limited | Arts & recreation | 2019 |
| Yearn Records Ltd | Other services | 2017 |
| YED Haircare and Beauty Services Ltd | Other services | 2021 |
| Yellow Bridge Partners LLP | | 2019 |
| Yellow Jersey Graphics Limited | Arts & recreation | 2010 |
| Yellow Note Limited | Professional & scientific | 1999 |
| Yellow Tree Capital (Developments) Limited | Financial services | 2017 |
| Yellow Tree Capital (Joint Ventures) Limited | Financial services | 2019 |
| Yellow Tree Capital (Lending) Limited | Financial services | 2023 |
| Yellow Tree Capital (Loans) Limited | Financial services | 2019 |
| Yellow Tree Capital Associates LLP | | 2015 |
| Yellow Tree Capital Finance LLP | | 2026 |
| Yellow Tree Capital Holdings Limited | Financial services | 2025 |
| Yellow Tree Capital Partners LLP | | 2014 |
| Yeoman Place Management Company Limited | Professional & scientific | 2015 |
| Yeoman's Meadows Limited | Households | 1960 |
| YES Accounting Limited | Professional & scientific | 2011 |
| Yhim Limited | Manufacturing | 2015 |
| Yieh Management Ltd | Real estate | 2017 |
| Yoga and Pilates by Katie Ltd | Arts & recreation | 2025 |
| Yoga Chak Ltd | Other services | 2021 |
| Yoghurt Dill Ltd | Manufacturing | 2023 |
| Yogol Ltd | Information & communication | 2025 |
| York Road (Tunbridge Wells) Management Company Limited | Real estate | 2005 |
| Yorkshire Hana Limited | Real estate | 2024 |
| Young & Jung Consulting Limited | Professional & scientific | 2017 |
| Young Coding Academy Ltd | Education | 2025 |