| WHR Property Management Ltd | Real estate | 2023 |
| Whytewolf Ltd | Arts & recreation | 2018 |
| Wickham Bishops Barbers Limited | Other services | 2025 |
| Wide Property Ltd | Administrative & support | 2021 |
| Widmore Limited | Professional & scientific | 2014 |
| Widmore RTM Company Limited | Households | 2019 |
| WIG & PEN Services Limited | Professional & scientific | 1990 |
| Wiggin Burchsmith & Verde Limited | Health & social care | 2001 |
| Wiggy KIT Limited | Wholesale & retail | 1998 |
| Wika Limited | Construction | 2023 |
| Wild by Name Ltd | Wholesale & retail | 2020 |
| Wild Stories Ltd | Information & communication | 2025 |
| Wild Wings Safaris UK Ltd | Administrative & support | 2013 |
| Will & Yates Ltd | Wholesale & retail | 2019 |
| Willersley Securities Limited | Real estate | 1964 |
| William Adams Bespoke Ltd | Wholesale & retail | 2021 |
| William Court (Chalfont Road) RTM Company Limited | Real estate | 2021 |
| William Patrick Building Solutions Ltd | Construction | 2022 |
| William Square (Rotherhithe) RTM Company Limited | Real estate | 2026 |
| William Square 2 (Rotherhithe) RTM Company Limited | Real estate | 2026 |
| Willis House RTM Company Limited | Households | 2024 |
| Willoughby Wellbeing Limited | Financial services | 2020 |
| Willow Court (SE26) RTM Company Limited | Households | 2025 |
| Willow Court (Springwell Lane) Management Company Limited | Households | 2001 |
| Willow Maintenance and Cleaning Solutions Ltd | Administrative & support | 2025 |
| Willowcroft Residents (Blackheath) Management Limited | Real estate | 1979 |
| Willows Magic Limited | Manufacturing | 2004 |
| Willowstump Limited | Households | 2008 |
| Wills Motorcycles Limited | Wholesale & retail | 2024 |
| Wilmington Close RTM Company Limited | Households | 2013 |
| Wilson Accounting Limited | Professional & scientific | 2007 |
| Wimpole Close Management Limited | Households | 1987 |
| Winchester Close Limited | Households | 2004 |
| Winchester Gardens Residents Limited | Households | 1987 |
| Winchester Holdings Limited | Professional & scientific | 2015 |
| Wind Marine Ltd | Extraterritorial | 2025 |
| Wingrave Holdings Limited | Financial services | 2024 |
| Wings IT UP Ltd | Hospitality | 2022 |
| Winimate Property Ltd | Real estate | 2021 |
| Winnersfemalefamilyorganization Ltd | Public administration | 2025 |
| Winnertex Group Limited | Extraterritorial | 2012 |
| Wint House Management Limited | Households | 1982 |
| Winwestor Consultants Limited | Information & communication | 2025 |
| Wippit Ltd. | Information & communication | 2017 |
| Wisbey Ltd | Administrative & support | 2024 |
| Wisdom Canvas Ltd | Information & communication | 2024 |
| Wisdom for Goldfish Ltd | Information & communication | 2024 |
| Wise Start Ltd | Professional & scientific | 2023 |
| Wishfit Group Limited | Hospitality | 2023 |
| Wishfit Southport Limited | Arts & recreation | 2022 |
| Wishlist Collectables Ltd | Wholesale & retail | 2019 |
| Wishtree Financial Services Limited | Financial services | 2021 |
| Witek Construction Limited | Extraterritorial | 2018 |
| Withcamera Ltd | Information & communication | 2014 |
| WJ International Limited | Professional & scientific | 2008 |
| WJH Plumbing Services Ltd | Construction | 2018 |
| WJP Administration Ltd | Financial services | 2013 |
| WLA Housing Ltd | Households | 2025 |
| WM Consultants Limited | Administrative & support | 2011 |
| WM Consulting Limited | Administrative & support | 2017 |
| WN Consulting Ltd | Professional & scientific | 2024 |
| Wondersnevercease Creative Industries Limited | Professional & scientific | 2012 |
| Wonk Music Ltd | Information & communication | 2006 |
| Wood and Grain Limited | Hospitality | 2024 |
| Wood Close Residents Management Limited | Households | 1984 |
| Wood Wharf (Greenwich) RTM Company Limited | Real estate | 2019 |
| Wood-U-Waste Limited | Water & waste | 2009 |
| Woodbury Interiors London Ltd | Professional & scientific | 2013 |
| Woodcote Builders Ltd | Construction | 2020 |
| Woodcote Grange RTM Company Limited | Households | 2020 |
| Wooden Floors Maintenance Ltd | Construction | 2015 |
| Wooderson Court Limited | Households | 2001 |
| Wooderson Freehold Company Ltd | Households | 2006 |
| Woodfields Freehold Company Limited | Households | 2000 |
| Woodlands 3397 Limited | Households | 2025 |
| Woodlands Day Nursery Ltd | Education | 2026 |
| Woodlands Equity Limited | Administrative & support | 2010 |
| Woodlands Valley Residents' Association Limited | Households | 2003 |
| Woodside Building Co Ltd | Construction | 2024 |
| Woolwich Manor Way, Beckton Flat Management Company Limited | Households | 2002 |
| Worcester Court Management Ltd | Households | 2019 |
| Words That Work Ltd | Professional & scientific | 2020 |
| Wordsworth Place Two (Mitcham) Management Company Limited | Households | 1996 |
| Work Psychology Hub Ltd | Professional & scientific | 2017 |
| Working Places Ltd | Professional & scientific | 2019 |
| World Club Basketball Tournament C.I.C. | Arts & recreation | 2022 |
| Worthcare Limited | Wholesale & retail | 1995 |
| WR Rental Solutions Ltd | Real estate | 2025 |
| Wrenwood Court RTM Company Limited | Households | 2017 |
| Wright & Co Property Ltd | Real estate | 2026 |
| WRM Building Services Ltd | Construction | 2023 |
| Wsgt Ltd | Transport & logistics | 2020 |
| Wunderbar Healthcare Ltd | Health & social care | 2020 |
| Wyebridge Estates Limited | Households | 2000 |
| Wyncliffe Court Management Company Limited | Households | 1995 |
| Wynola Ltd | Health & social care | 2021 |
| X Hunts Ltd | Wholesale & retail | 2024 |
| XB Lighting Limited | Professional & scientific | 2023 |
| Xbeauty Limited | Wholesale & retail | 2025 |
| Xcollabz Ltd | Wholesale & retail | 2023 |