| Walker James Consulting Limited | Professional & scientific | 2019 |
| Walker Russell Limited | Professional & scientific | 2018 |
| Wallace Family Investment Co. Limited | Financial services | 2018 |
| Walnut Property Investments Limited | Construction | 2017 |
| Waltham Forest Engineering Limited | Manufacturing | 1972 |
| Wamela Lettngs and Property Management Ltd. | Real estate | 2022 |
| Wanstead Heights Limited | Real estate | 2019 |
| Wanstead Real Estates Ltd | Real estate | 2020 |
| Wapping Riverside Limited | Construction | 2009 |
| Ward’S Contracting Limited | Manufacturing | 2018 |
| Warjay Management Limited | Households | 1974 |
| Warren Drives & Patios Ltd | Construction | 2003 |
| Wasteline Recycling Limited | Water & waste | 2013 |
| Watch Game Limited | Wholesale & retail | 2024 |
| Water & Power Engineering Limited | Professional & scientific | 1998 |
| Waterhouse Street Limited | Real estate | 2016 |
| Waterlily Portfolio Ltd | Real estate | 2024 |
| Waters Edge Catering Company Limited | Hospitality | 2011 |
| Waxmans Limited | Professional & scientific | 2008 |
| Wayne Monk Limited | Education | 2009 |
| WB Partnership Limited | Construction | 2007 |
| WBS Fire & Security Limited | Construction | 2010 |
| WBZ Essex Limited | Other services | 2016 |
| WE Coach YOU Grow Limited | Professional & scientific | 2017 |
| WE DO Consulting Limited | Professional & scientific | 2020 |
| WE Educate Recruitment Ltd | Administrative & support | 2023 |
| WE Strong Ltd | Health & social care | 2022 |
| Weald Hall Management Limited | Real estate | 1985 |
| Wearecrank Limited | Information & communication | 2015 |
| Weatherbird Limited | Real estate | 2014 |
| Weaver Flooring (London) Limited | Manufacturing | 2008 |
| Webbco Properties Limited | Real estate | 2024 |
| Webmafia Ltd | Information & communication | 2012 |
| Wedmore Street (London N19) Management Company Limited | Real estate | 1999 |
| Wefly Ltd | Administrative & support | 2021 |
| Weilai Limited | Manufacturing | 2019 |
| Weldon Heating and Plumbing Limited | Construction | 2014 |
| Well Street Developments Ltd | Construction | 2021 |
| Wellfield Developments Ltd | Real estate | 2007 |
| Wellington Buildings a RTM Company Limited | Households | 2022 |
| Wellington Buildings B RTM Company Limited | Households | 2022 |
| Wellington Flooring Ltd | Construction | 2021 |
| Wellington.Court@Stepney Limited | Households | 2000 |
| Wellrew Limited | Financial services | 2020 |
| Wembley Brook Properties Ltd | Real estate | 2022 |
| Wembley Edge Property Ltd | Real estate | 2020 |
| Wenham Profiles Limited | Agriculture & fishing | 2010 |
| West Essex Services Limited | Construction | 2021 |
| West Ridge Consulting Limited | Administrative & support | 2018 |
| West Silvertown Place Limited | Real estate | 2021 |
| West Wind Property Development Limited | Construction | 2015 |
| Westbury Investment Company Limited | Construction | 1954 |
| Westgate House Developments Limited | Construction | 2016 |
| Westmore Wholesale Food Limited | Wholesale & retail | 2024 |
| Westwood & Montgomerie Management Limited | Households | 2019 |
| WHE Holdings Limited | Financial services | 2019 |
| When Saturday Comes Limited | Information & communication | 1987 |
| Where There IS NO Picu Limited | Health & social care | 2021 |
| Whip Passion Car Care Limited | Wholesale & retail | 2024 |
| Whipalot Ltd | Wholesale & retail | 2024 |
| Whistlebrook Investments Limited | Financial services | 1985 |
| White Dimension Ltd | Construction | 2019 |
| Whitecliff Services Ltd | Transport & logistics | 2017 |
| Whitedash Holdings Ltd | Financial services | 2025 |
| Whitehorse Glass Co. Limited | Other services | 2005 |
| Whitfield Mastering Limited | Arts & recreation | 2006 |
| Whytecliffe Road Estates Ltd | Real estate | 2020 |
| Wickens Equestrian Limited | Agriculture & fishing | 2024 |
| William Rose Trading Ltd | Wholesale & retail | 2023 |
| Willow Consultancy Services Limited | Construction | 2007 |
| Willow Property Investment Group Ltd | Real estate | 2024 |
| Willowrent Property Management Company Limited | Households | 1991 |
| Wilpack Distribution Limited | Wholesale & retail | 2023 |
| Wilsons Decorators Limited | Construction | 2004 |
| Wiltonrun Limited | Real estate | 1997 |
| Winart Publications Limited | Wholesale & retail | 1983 |
| Winchmore Limited | Construction | 1996 |
| Winchmore Projects Limited | Construction | 1997 |
| Windora Limited | Professional & scientific | 2001 |
| Windows 3000 Ltd | Construction | 2019 |
| Winger Services Ltd | Information & communication | 2018 |
| Wingfield PR Ltd | Professional & scientific | 2010 |
| Winsor Security (UK) Ltd | Administrative & support | 2013 |
| Winston Churchill Residents Management Company Limited | Households | 2017 |
| Winter Greene Ltd | Professional & scientific | 2023 |
| Wirestar Hub Ltd | Wholesale & retail | 2024 |
| Wise Organic Ltd | Wholesale & retail | 2022 |
| Wiseclean Limited | Administrative & support | 1993 |
| WJ Lynch Limited | Professional & scientific | 2021 |
| Wolverine Logistics Ltd | Transport & logistics | 2024 |
| Woodbury Estates Limited | Real estate | 2013 |
| Woodbury Hill Owners Association Limited | Administrative & support | 1982 |
| Woodbury Properties Limited | Real estate | 2014 |
| Woodcroft School Limited | Education | 1963 |
| Wooderful Things Ltd | Wholesale & retail | 2023 |
| Woodford Aircraft LLP | | 2019 |
| Woodford Heating & Energy Limited | Construction | 1993 |
| Woodford Heating & Energy Trustees Limited | Other services | 2019 |
| Woodford New Road Property Ltd | Real estate | 2023 |
| Woodford Plumbing & Heating Ltd | Construction | 2022 |