| West Rockford Ltd | Administrative & support | 2007 |
| Westcourt Lane Management Limited | Real estate | 2025 |
| Westfield Chesil Limited | Wholesale & retail | 2022 |
| Westheath Properties Limited | Households | 1992 |
| Westminster Apartments Limited | Real estate | 2020 |
| Westminster Bridge Hub Limited | Real estate | 2024 |
| Westminster Education Group Ltd | Information & communication | 2020 |
| Westminster Rare Books Limited | Wholesale & retail | 2017 |
| Wetherton Properties Ltd | Real estate | 2023 |
| Weva Homes Ltd | Construction | 2021 |
| WEY Gardens (Haslemere) Management Limited | Households | 2004 |
| Weybridge Capital Limited | Professional & scientific | 2026 |
| WG Moss Paralegal Services Limited | Professional & scientific | 2016 |
| What About US Music Limited | Professional & scientific | 2025 |
| WHCC2 Limited | Extraterritorial | 1999 |
| Whirlwind Studios Ltd | Information & communication | 2026 |
| Whiskey Tango Foxtrot Limited | Information & communication | 2010 |
| Whistlewood Holdings | Other services | 2019 |
| Whistling Thorn Designs Limited | Arts & recreation | 2020 |
| White Bricks Ltd | Construction | 2023 |
| White Creek Ltd | Information & communication | 2010 |
| White Hill Production Limited | Information & communication | 2016 |
| White Horse Construction and Engineering Ltd | Construction | 2020 |
| White Kite Predictive Ltd | Professional & scientific | 2006 |
| White River Marketing Limited | Professional & scientific | 2025 |
| White Sand Management Company Ltd | Households | 2007 |
| Whitelight ISD Limited | Professional & scientific | 2006 |
| Whma Services Ltd | Other services | 2021 |
| WHO Enterprises Limited | Professional & scientific | 2008 |
| Whole Harmony Colonics & Detox Ltd | Manufacturing | 2015 |
| WHY YOU Thinking Limited | Arts & recreation | 2016 |
| Wick House Development Ltd | Construction | 2022 |
| Wide World Services Limited | Construction | 1998 |
| Wight House Residents Company(The)Limited | Households | 1965 |
| Wigton Development Ltd | Construction | 2017 |
| Wigton Place SE11 Management Company Limited | Households | 2019 |
| Wild Acres Holdings Ltd | Real estate | 2025 |
| Wild Acres Ltd | Construction | 2023 |
| Wildfire Employee Ownership Trust Limited | Administrative & support | 2024 |
| Wildfire Group Limited | Professional & scientific | 2019 |
| Wildfire PR Limited | Professional & scientific | 1987 |
| Wilkian Associates Limited | Information & communication | 2009 |
| Willder's Wholesale Ltd | Wholesale & retail | 2023 |
| William Anthony Limited | Financial services | 2017 |
| William Dyer Limited | Manufacturing | 2006 |
| Williams Contractors Ltd | Construction | 2024 |
| Williams Family Wines Limited | Wholesale & retail | 2026 |
| Williamson & Sons Ltd | Construction | 2015 |
| Willow Manor Residents Association Limited | Households | 1972 |
| Willowbank Developments Limited | Financial services | 1999 |
| Willowhurst Financial Planning Limited | Financial services | 2024 |
| Willows Medical Consultancy Ltd | Professional & scientific | 2021 |
| Wills N Trusts Ltd | Professional & scientific | 2011 |
| Wilson Jewellery Limited | Professional & scientific | 2018 |
| Wimbledon Construction (Trading) Limited | Construction | 2024 |
| Wimbledon Construction Limited | Real estate | 2007 |
| Winchester Hills Ltd | Professional & scientific | 2024 |
| Winchmore FST Ltd | Information & communication | 2018 |
| Windmill Organics Limited | Wholesale & retail | 1998 |
| Windows of Opportunities Ltd | Professional & scientific | 2019 |
| Windsor Court (Kingston) Residents Association Limited | Households | 1991 |
| Windsor Way Management Company Limited(The) | Households | 1985 |
| Windy Nook Ltd | Real estate | 2024 |
| Wined UP Here Limited | Wholesale & retail | 2007 |
| Wing YEE Properties Limited | Real estate | 2020 |
| Wingfield Associates Limited | Public administration | 2023 |
| Wins Sushi Limited | Hospitality | 2025 |
| Winter Bear Home Limited | Other services | 2017 |
| Wisdom AGE Ltd | Information & communication | 2023 |
| Wise Telecom UK Limited | Wholesale & retail | 2024 |
| Wise Words Consulting Ltd | Professional & scientific | 2016 |
| Wisebury Labs Ltd. | Wholesale & retail | 2018 |
| Wishj Ltd | Information & communication | 2022 |
| WM Optimise Ltd | Professional & scientific | 2026 |
| Wogaard Ltd. | Professional & scientific | 2009 |
| Wolfmoon Publishing Limited | Information & communication | 2019 |
| Wolleswinkel Hofman Advocaten LLP | | 2016 |
| Wolters Kluwer (BSI) Limited | Information & communication | 2012 |
| Wolters Kluwer Health (Medical Research) Limited | Information & communication | 1983 |
| Women in Aesthetics Ltd | Other services | 2022 |
| Women in Unexpected Places | Education | 2026 |
| Wonder Whippet Limited | Health & social care | 2022 |
| Wonderful World of Treats Limited | Wholesale & retail | 2022 |
| Wonford Close Management Company Limited | Households | 1987 |
| Wonpos Ltd | Wholesale & retail | 2025 |
| WOO Agency Ltd | Information & communication | 2018 |
| Wood and Sons Vent Limited | Construction | 2022 |
| Woodcote House Freehold Company Limited | Administrative & support | 2013 |
| Woodcote House Management Company Limited | Households | 2005 |
| Woodcroft Developments (Uckfield) Limited | Construction | 2024 |
| Woodcroft Developments Limited | Construction | 2021 |
| Woodland Products Design Limited | Manufacturing | 1999 |
| Woodland Rise Residents Company Limited | Households | 1991 |
| Woodley Bathrooms Limited | Construction | 2026 |
| Woodman Flat Management Limited | Real estate | 2002 |
| Woodroffe Bassett Design LLP | | 2017 |
| Woodroffe Bassett Limited | Professional & scientific | 2026 |
| Woodstock Shutter Company Limited | Wholesale & retail | 2016 |
| Woodview Care Ltd | Health & social care | 2023 |
| Woof&Wash Ltd | Other services | 2025 |