| Willmoreland Consulting Limited | Professional & scientific | 2018 |
| Willmot Fabrications Limited | Manufacturing | 2011 |
| Willoden Globeworks Ltd | Education | 2021 |
| Willow & Hardy's Tunbridge Wells Limited | Hospitality | 2018 |
| Willow Bank Court Limited | Households | 1969 |
| Willow Court (West Ewell) Management Company Limited | Households | 2013 |
| Willow Court Residents Management Limited | Households | 2002 |
| Willow Green (Phase II) Limited | Households | 1990 |
| Willow Grove (Nascot Wood) Management Company Limited | Households | 2012 |
| Willow Learning for Life Ltd Community Interest Company | Education | 2016 |
| Willow Mead (Wiveliscombe) Management Company Limited | Households | 2015 |
| Willow Reach Residents Management Company Limited | Households | 2014 |
| Willow Serenity Recruitment Ltd | Administrative & support | 2025 |
| Willow View and Bridge House Management Company Limited | Real estate | 2007 |
| Willowdale (Basildon) Residents Association Limited | Households | 1991 |
| Willows Green Management Company Limited | Households | 2006 |
| Wills International Ltd | Wholesale & retail | 2022 |
| Willworth Properties Ltd | Real estate | 2023 |
| Wilma Investments Ltd | Real estate | 2021 |
| Wilmfarn Limited | Other services | 2002 |
| Wilmot Street (Management) Company Limited | Households | 1985 |
| Wilsons Property Management Limited | Real estate | 2013 |
| Wilton Close Management Limited | Households | 1984 |
| Wiltons Building Services Ltd | Construction | 2016 |
| Wiltons Insulation Flues & Chimneys Limited | Construction | 1996 |
| Wiltshire Building & Roofing Limited | Construction | 2015 |
| WIM Horizon Ltd | Wholesale & retail | 2019 |
| Wimbledon 333 Ltd | Real estate | 2025 |
| WIN Worth Solutions Limited | Wholesale & retail | 2014 |
| Winarr AI Ltd | Information & communication | 2026 |
| Winchelsea LLP | | 2016 |
| Windermere Gate Management Company Ltd | Real estate | 2010 |
| Windmill Green Flat Management Company Limited | Other services | 1999 |
| Windmill Rise 428 Ltd | Households | 2024 |
| Windmill Service Centre Ltd | Wholesale & retail | 2022 |
| Windmill Trading Limited | Wholesale & retail | 2017 |
| Windoordoc Limited | Administrative & support | 2025 |
| Window Fitters Ltd | Administrative & support | 2016 |
| Windrose Homes Ltd | Construction | 2018 |
| Windrush Enterprise Ltd | Hospitality | 2011 |
| Windsor House RTM Company Ltd | Households | 2025 |
| Windsor Park (Garstang) Management Co Limited | Households | 1990 |
| Windsor Place Management Limited | Households | 2003 |
| Winespeak Ltd | Wholesale & retail | 2020 |
| Wing N 2 Ltd | Hospitality | 2024 |
| Wing WAH Delivery Limited | Hospitality | 2023 |
| Wing'N 1 Ltd | Hospitality | 2024 |
| Wingfield Property SE27 Ltd | Real estate | 2023 |
| Wingfield Property SE27B Ltd | Real estate | 2024 |
| Wingz by Kalisco Ltd | Hospitality | 2025 |
| Winkfield Gate (Winkfield) Limited | Households | 2013 |
| Winnington View Management Company Limited | Households | 2021 |
| Winnington Village Community Management Company Limited | Households | 2013 |
| Winns Avenue Management Company Limited | Households | 2019 |
| Winnycroft Residents Management Company Limited | Households | 2022 |
| Winston Co Accounting Ltd | Real estate | 2016 |
| Winston Sally Hair 'Wash' Limited | Other services | 2024 |
| Winstonrose Ltd | Professional & scientific | 2012 |
| Winterbourne Kenrick (Harborne) Management Company Ltd | Households | 2013 |
| Winterley Gardens (Winterley) Management Company Limited | Households | 2017 |
| Winway College of Business & Technology Limited | Education | 2016 |
| Winway Technology Limited | Information & communication | 2016 |
| Wirecard Card Solutions Limited | Financial services | 2011 |
| Wired Safe Ltd | Construction | 2023 |
| Wired UPP Ltd | Information & communication | 2026 |
| Wisby Limited | Administrative & support | 2013 |
| Wisdom Home Supported Living Ltd | Health & social care | 2022 |
| Wise Investment Analysis Ltd | Professional & scientific | 2024 |
| Wistow Court Management Company Limited | Households | 1987 |
| With ALL Being Well Ltd | Education | 2024 |
| Withers & Co. Accountancy Services Ltd | Financial services | 2014 |
| Withersea Ventilation Ltd | Construction | 2019 |
| Withfriendslikeyou.Com Limited | Information & communication | 2016 |
| Withies Bridge Management Company Ltd | Households | 2012 |
| Withoutme Limited | Information & communication | 2018 |
| Witley Capital Limited | Hospitality | 2017 |
| WIZ Fitness Ltd | Arts & recreation | 2018 |
| Wizarch Construction Limited | Construction | 2013 |
| Wizarch Limited | Professional & scientific | 2010 |
| Wizard World of Vaping Ltd | Wholesale & retail | 2026 |
| Wizemail UK Limited | Information & communication | 2015 |
| Wizzo London Limited | Professional & scientific | 2002 |
| WJA Services Company Limited | Administrative & support | 2016 |
| Wkelahi Ltd | Real estate | 2025 |
| WLC Oxted Ltd | Health & social care | 2024 |
| WLK Thru AI Limited | Information & communication | 2026 |
| WLR Services Ltd | Real estate | 2020 |
| Wmona Supplies Ltd | Other services | 2024 |
| Wnw-Construction Ltd | Construction | 2019 |
| Woburn Court Management Company (Woking) Limited | Households | 2006 |
| Wodeware Limited | Information & communication | 2014 |
| Wofa JOE Market Ltd | Wholesale & retail | 2020 |
| WOH Investments Ltd | Real estate | 2025 |
| Wolfdale Limited | Households | 1977 |
| Wolfdene House Limited | Households | 2011 |
| Wolfe Crescent (Residents) Management Limited | Households | 1988 |
| Wolfwill Limited | Health & social care | 2019 |
| Wolman & Dunn Limited | Real estate | 2019 |
| Wombbae Ltd | Extraterritorial | 2021 |
| Women of Worship C.I.C. | Other services | 2024 |