| William Alfred Ltd | Other services | 2025 |
| William Covell Close Residents Association Limited | Households | 1976 |
| William Medi Services Ltd | Administrative & support | 2020 |
| William Nails Limited | Other services | 2022 |
| Williams Business Solutions Ltd | Professional & scientific | 2022 |
| Willingham Electrical Ltd | Construction | 2020 |
| Williot Property Ltd | Real estate | 2023 |
| Willmax Care Agency Ltd | Administrative & support | 2020 |
| Willmore Limited | Extraterritorial | 2002 |
| Willow & Stone Homes Ltd | Real estate | 2025 |
| Willow Building Surveyors Ltd | Professional & scientific | 2026 |
| Willow Skincare Limited | Manufacturing | 2020 |
| Wilson Fish Shop Ltd | Hospitality | 2025 |
| Wilson H & V Services Limited | Construction | 2003 |
| Wilsons Carpentry and Building Solutions Ltd | Construction | 2024 |
| Wilsons Chippy Ltd | Hospitality | 2024 |
| Win-K Properties Limited | Real estate | 2004 |
| Winbee Ltd | Transport & logistics | 2021 |
| Winborne Limited | Financial services | 2017 |
| Winchester Fruit & VEG Ltd | Wholesale & retail | 2025 |
| Winchmore Accountants Ltd | Professional & scientific | 2022 |
| Winchmore Consulting Ltd | Professional & scientific | 2022 |
| Winchmore Hill Carers Ltd | Health & social care | 2026 |
| Winchmore Roofing & Building Ltd | Construction | 2023 |
| Winchmore Windows Ltd | Construction | 2020 |
| Wind Cafe Ltd | Hospitality | 2020 |
| Wind Engineering & Consultancy Ltd | Information & communication | 2018 |
| Windfall Legal Limited | Professional & scientific | 2010 |
| Windmill Brothers Limited | Construction | 2001 |
| Windmill DRY Cleaners Ltd | Other services | 2018 |
| Windmill Hill Caffe Limited | Hospitality | 2024 |
| Window Kings Ltd | Construction | 2020 |
| Window Repair Enfield Ltd | Construction | 2016 |
| Windscreen Fixers Ltd | Wholesale & retail | 2018 |
| Windsoft Tech UK Limited | Information & communication | 2022 |
| Wine Factor Ltd | Wholesale & retail | 2025 |
| Wing Shun Limited | Administrative & support | 2002 |
| Wing Town Ltd | Hospitality | 2024 |
| Wingerz Wingz Limited | Hospitality | 2020 |
| Winngoo Business Solutions Ltd | Administrative & support | 2020 |
| Winngoo Coin Ltd | Financial services | 2020 |
| Winngoo Connect Ltd | Information & communication | 2024 |
| Winngoo EAT Limited | Hospitality | 2023 |
| Winngoo Fintech Ltd | Financial services | 2020 |
| Winngoo Group Limited | Financial services | 2020 |
| Winngoo Holdings PLC | Financial services | 2023 |
| Winngoo Infotech Ltd | Information & communication | 2023 |
| Winngoo Ipac Ltd | Financial services | 2020 |
| Winngoo Mart Ltd | Information & communication | 2024 |
| Winngoo Properties Ltd | Real estate | 2020 |
| Winngoo Telecom Services Ltd | Information & communication | 2025 |
| Winngoo Trade Limited | Information & communication | 2020 |
| Winngoo UK PVT Ltd | Information & communication | 2022 |
| Winngoo Worldwide Ltd | Financial services | 2022 |
| Winnie & Lynn Limited | Wholesale & retail | 2019 |
| Wirecon Ltd | Professional & scientific | 2017 |
| Wired Wireless Ltd | Information & communication | 2014 |
| Wisdom London Limited | Real estate | 2022 |
| Wise Guard Limited | Information & communication | 2020 |
| Wise Heating Ltd | Construction | 2025 |
| Wise Monkey House Limited | Extraterritorial | 2020 |
| Wisearn Ltd | Real estate | 2024 |
| Wisefull Education Limited | Professional & scientific | 2019 |
| Wish Auto Body Repair Limited | Wholesale & retail | 2024 |
| Wish Private Limited | Education | 2025 |
| Wits END Touring Ltd | Information & communication | 2010 |
| Witty Inventions Ltd | Wholesale & retail | 2019 |
| Wize UK Properties Ltd | Real estate | 2025 |
| Wizebuild Ltd | Construction | 2024 |
| Wizehire Ltd | Administrative & support | 2025 |
| WJF Signalling Ltd | Manufacturing | 2020 |
| WMJ Group Limited | Other services | 2024 |
| WNB Nail Limited | Other services | 2023 |
| Wola Action Ltd | Hospitality | 2023 |
| Wolfie UGE Limited | Other services | 2014 |
| Wolke Ltd | Information & communication | 2026 |
| Women Drive Electric Limited | Other services | 2022 |
| Women Inspire Women Limited | Other services | 2015 |
| Wonderland Global Limited | Financial services | 2022 |
| Wonky Giraffe Ltd | Information & communication | 2015 |
| Wood Centre Enfield Limited | Wholesale & retail | 2023 |
| Wood Green Express Ltd | Wholesale & retail | 2018 |
| Woodcraft Joinery London Ltd | Construction | 2020 |
| Woodend Craft Ltd | Real estate | 2024 |
| Woodford Express Ltd | Wholesale & retail | 2019 |
| Woodhurst Holdings Limited | Other services | 2018 |
| Woodhurst Livery Services (U.K.) Ltd | Other services | 2017 |
| Woodhurst Livery Stables Ltd | Agriculture & fishing | 2009 |
| Woodland Carpentry Ltd | Construction | 2025 |
| Woods & Foster Limited | Professional & scientific | 2019 |
| Woodstock Group London Limited | Construction | 2024 |
| Woodstock Joinery London Ltd | Construction | 2023 |
| Woodstock of Ascot Limited | Administrative & support | 2008 |
| Woodstock Property Limited | Real estate | 2024 |
| Woody & Kleiny Limited | Administrative & support | 2018 |
| Woody Workz UK Ltd | Wholesale & retail | 2026 |
| Wootton Road Flat Management Limited | Real estate | 1990 |
| WORDS2WIN Ltd | Information & communication | 2020 |
| Work Rate Studios Limited | Information & communication | 2024 |
| Workforce Bank Limited | Professional & scientific | 2003 |