| Whitley Builders (2004) Limited | Construction | 2004 |
| Whitley Builders Limited | Construction | 2011 |
| Whitley Court Freehold Limited | Households | 2023 |
| Whitmead Freehold Company Limited | Households | 1993 |
| Whitmead Management Company Limited | Households | 1982 |
| Whole Balance Ltd | Health & social care | 2012 |
| Wickham PUB Management Ltd | Hospitality | 2025 |
| Wild Spirit (UK) Limited | Information & communication | 2007 |
| Wild West Properties Ltd | Households | 2017 |
| Wilhann & Co Property Management Ltd | Real estate | 2024 |
| Wilhann Learning Ltd | Education | 2024 |
| Will's Whereabouts Ltd | Information & communication | 2023 |
| William Street Holdings Limited | Financial services | 2021 |
| William Thornton Interiors Limited | Professional & scientific | 2017 |
| Willows Grounds Maintenance Ltd | Administrative & support | 2024 |
| Wilson Jane Consultancy Limited | Professional & scientific | 2023 |
| Wimbourne Tenants Ltd | Households | 2024 |
| Win-Win Health Intelligence Limited | Information & communication | 2016 |
| Winlove Publications Limited | Information & communication | 1981 |
| Winston and Wiggles Ltd | Wholesale & retail | 2024 |
| Winston Builds Ltd | Construction | 2022 |
| Wisian Holdings Limited | Real estate | 2017 |
| Wisley Court Management Limited | Households | 1981 |
| Wisteria Gates Ltd | Real estate | 2026 |
| Witham Cleaning Company Ltd | Administrative & support | 2018 |
| Witmun Engineering Limited | Wholesale & retail | 2015 |
| WJK Projects Ltd | Professional & scientific | 2025 |
| Wjme Productions Ltd | Arts & recreation | 2013 |
| Wmpc Limited | Information & communication | 2014 |
| Wolf Pack Collective Limited | Information & communication | 2014 |
| Wolvock Holdings Limited | Financial services | 2025 |
| Womble Construction Limited | Construction | 2015 |
| Wondergrid Leisure Ltd | Administrative & support | 2026 |
| Wonderlust Events Ltd | Extraterritorial | 2016 |
| Woodlands (Chapel Road) Residents Company Limited | Real estate | 1993 |
| Woodpecker Mount Management Limited | Households | 1968 |
| Woodslea Limited | Professional & scientific | 2009 |
| Woodwork for Wellbeing CIC | Manufacturing | 2020 |
| Woolborough Homes Limited | Real estate | 2023 |
| Work Success London Limited | Professional & scientific | 2024 |
| Worldwide Educator Professional Development Limited | Education | 2012 |
| Worth Consultants Ltd | Professional & scientific | 2017 |
| Worthington Telecom Limited | Information & communication | 2014 |
| WPS Building Consultancy Limited | Professional & scientific | 2023 |
| Wrenbrook Ltd | Professional & scientific | 2026 |
| Wright Landscape and Arboriculture Limited | Professional & scientific | 2017 |
| Wurbanes Estates (Southern) Ltd | Real estate | 2023 |
| Wurbanes Estates Limited | Real estate | 2017 |
| Wyburn Properties Limited | Construction | 2021 |
| Wynderfield Flat Management Limited | Households | 1996 |
| Xcore IT Services (UK) Ltd. | Extraterritorial | 2013 |
| Xfacta Ltd | Professional & scientific | 2018 |
| Xquisite PR Ltd | Manufacturing | 2013 |
| Xquisite Productions Ltd | Professional & scientific | 2015 |
| Xstro Limited | Real estate | 2000 |
| Xstro Management Limited | Real estate | 2024 |
| Xxjuices Ltd | Wholesale & retail | 2026 |
| XYZ Healthcare Limited | Administrative & support | 2022 |
| Yabous Limited | Financial services | 2018 |
| Yellow Hammer Home Improvements Limited | Construction | 2016 |
| Yellow Jersey Inc Limited | Extraterritorial | 2014 |
| Yeloshield Limited | Professional & scientific | 2016 |
| YES GUV Limited | Transport & logistics | 2024 |
| Yeshe Ltd | Information & communication | 2020 |
| Ymca East Surrey | Hospitality | 1999 |
| Yoga Ananda Limited | Arts & recreation | 2009 |
| YOK Consulting Ltd | Wholesale & retail | 2021 |
| Yosei MC Ltd | Other services | 2015 |
| YOU Ritual Ltd | Wholesale & retail | 2021 |
| Young Dixies Limited | Arts & recreation | 2008 |
| Youngs Photography Limited | Professional & scientific | 2022 |
| Your Savvy Virtual Sidekick Ltd | Administrative & support | 2024 |
| Your Town Self Storage Ltd | Administrative & support | 2014 |
| Yourrentl Limited | Households | 2021 |
| Yunopod Limited | Health & social care | 2022 |
| Yuriko Pasieka & Co Limited | Manufacturing | 2021 |
| Zagar Limited | Construction | 2010 |
| Zamkaz Limited | Health & social care | 2014 |
| Zensys Limited | Professional & scientific | 2006 |
| Zeseri Solutions Ltd | Administrative & support | 2023 |
| Zigzag Ventures Limited | Professional & scientific | 2021 |
| Zinnia Associates Limited | Professional & scientific | 2020 |
| Zionava Limited | Professional & scientific | 2026 |
| ZK Real Estate Management Ltd | Real estate | 2025 |
| ZK Retail Solutions Ltd | Wholesale & retail | 2025 |
| ZM Autos Ltd | Wholesale & retail | 2019 |
| Zoe's Plumbing and Heating Ltd | Construction | 2023 |
| Zoymal Ltd | Real estate | 2024 |
| Zuvae Ltd | Wholesale & retail | 2026 |