| WE ARE Red Ltd | Arts & recreation | 2022 |
| WE ARE Wyld Ltd | Manufacturing | 2022 |
| WE Paint That Limited | Construction | 2025 |
| Wealth Bridging Capital Limited | Real estate | 2024 |
| Wealth Growth Investments Ltd | Real estate | 2024 |
| Wealthtrek UK Ltd | Education | 2021 |
| Web and Print Editorial Services Limited | Administrative & support | 2009 |
| Web Creators UK Ltd | Information & communication | 2023 |
| Webofwellbeing CIC | Education | 2020 |
| Wehomework Limited | Construction | 2020 |
| Welday HR Consulting Limited | Extraterritorial | 2021 |
| Wellward Property Ltd | Construction | 2023 |
| Wendy Marx Retail Consultants Limited | Other services | 2009 |
| Wenham Holdings Ltd | Real estate | 2023 |
| Wensleydale Properties Limited | Professional & scientific | 1977 |
| Weskin Property UK Ltd | Real estate | 2020 |
| West London Ymca | Hospitality | 1996 |
| Westfield Court Properties Limited | Households | 1990 |
| Westflow Limited | Construction | 2015 |
| Westwealth Property Investments Ltd | Real estate | 2020 |
| Wexford Capital Ltd | Professional & scientific | 2022 |
| Wharf Resources Ltd | Mining & quarrying | 2005 |
| White Cliffs Hair Studios Ltd | Administrative & support | 2013 |
| White Spider Climbing Limited | Arts & recreation | 2010 |
| Whiteley Anaesthesia Limited | Health & social care | 2018 |
| Whitfield Civil Engineering Limited | Professional & scientific | 2007 |
| Whoops Studio Ltd | Professional & scientific | 2019 |
| Wilberg Studio Ltd. | Information & communication | 2025 |
| Wild Fluff Ltd | Wholesale & retail | 2023 |
| Wild Gardeners Limited | Administrative & support | 2018 |
| Wild Wood Adventure Ltd | Arts & recreation | 2012 |
| Wildcuts Ltd | Manufacturing | 2019 |
| Wilderberry Limited | Other services | 2002 |
| Wildling Hospitality Ltd | Professional & scientific | 2023 |
| Willesden Green Estates Limited | Real estate | 2025 |
| William Illing Consultancy Limited | Administrative & support | 2016 |
| Williams Property & Investments Limited | Real estate | 2025 |
| Willpower Limited | Arts & recreation | 2022 |
| Wilmay Investments Ltd | Real estate | 2021 |
| Wilmer Park Estates Freehold Company Limited | Households | 2009 |
| Wimbledon Chauffeur Ltd | Transport & logistics | 2023 |
| Wimbledon Wealth UK Ltd | Financial services | 2024 |
| WIN WIN Sushi Ltd | Hospitality | 2019 |
| Winchester House Freeholders Limited | Other services | 2006 |
| Winchester House Residents Association Limited | Households | 1968 |
| Windmill Court Property Management Company Limited | Real estate | 2012 |
| Winetastic Ltd | Wholesale & retail | 2020 |
| Wings Garden Fetcham Ltd | Hospitality | 2023 |
| Winscott Property Services Limited | Real estate | 2022 |
| Winton Court (Surbiton) Residents Association Limited | Households | 1961 |
| Wire UP Limited | Manufacturing | 2011 |
| Wise Heating & Plumbing Ltd | Construction | 2019 |
| Witchy Moon Limited | Health & social care | 2025 |
| With Portfolio Ltd | Professional & scientific | 2022 |
| Witley Schools Judo Ltd | Arts & recreation | 2007 |
| WJP Limited | Real estate | 2020 |
| WLS Productions Limited | Arts & recreation | 2018 |
| Wombles Limited | Extraterritorial | 2011 |
| Wonders Travel Limited | Administrative & support | 2023 |
| Woodgate House (Surbiton) Limited | Real estate | 1981 |
| Woodstock Boats Ltd | Administrative & support | 2023 |
| Woodstock Renovations Ltd | Construction | 2026 |
| Woodstreet Tech Ltd | Information & communication | 2025 |
| Word of Mouth Therapy Limited | Education | 2013 |
| Wordsworth Court Maintenance Limited | Administrative & support | 1959 |
| Work Wise Group Limited | Wholesale & retail | 2025 |
| Workeraware Lighting Limited | Professional & scientific | 2014 |
| World Challenge Expeditions Limited | Arts & recreation | 1987 |
| World Long Life Limited | Manufacturing | 2016 |
| Worthington Wright Limited | Construction | 2015 |
| Worthyterm Property Management Limited | Households | 1989 |
| Wradloff Consulting Ltd | Professional & scientific | 2022 |
| Wren Court (Surbiton) Freehold Limited | Administrative & support | 2021 |
| Wulfpro Investments Ltd | Real estate | 2022 |
| Wyburn Court Residents Association Limited | Households | 1971 |
| Xavier 1 Limited | Transport & logistics | 2021 |
| Xcel Surveying Limited | Professional & scientific | 2008 |
| XE2 Ltd | Information & communication | 2004 |
| Xenscrober Limited | Information & communication | 2014 |
| Xenscrohabitat Limited | Real estate | 2021 |
| Xinhuang Investors Ltd | Real estate | 2020 |
| XO Squared Limited | Manufacturing | 2015 |
| Xoxotica Limited | Wholesale & retail | 2022 |
| Xurg Ltd | Wholesale & retail | 2026 |
| Xxon Limited | Real estate | 2026 |
| XYZ Concierge Ltd | Information & communication | 2026 |
| Yadou Limited | Administrative & support | 2023 |
| Yellow DOT Group Ltd | Information & communication | 2023 |
| Yellow Energy Ltd | Mining & quarrying | 2009 |
| Yellow Thistle Ltd | Real estate | 2024 |
| YEW Lodge Management Company Limited | Households | 2006 |
| YEW Tree House Limited | Households | 1989 |
| Yist Ltd | Transport & logistics | 2020 |
| Yize Properties Limited | Real estate | 2017 |
| Yize Solutions Limited | Information & communication | 2011 |
| Ymca London Group Ltd | Other services | 2016 |
| Ymca ST Paul's Group | Hospitality | 1994 |
| Ymca ST Paul's Group (Development) Ltd | Construction | 2020 |
| Ymca ST Paul's Youth Project | Hospitality | 1990 |
| Yoctocom Limited | Professional & scientific | 2014 |