| Welcome Wholesale Ltd | Wholesale & retail | 2025 |
| Wentworth Glazing Company Ltd | Manufacturing | 2025 |
| Werka Property Ltd | Real estate | 2024 |
| Wespot Ltd | Wholesale & retail | 2023 |
| West Gate Solutions Limited | Construction | 2015 |
| West London Builders and GAS Services Ltd | Construction | 2019 |
| West London Minicabs Ltd | Transport & logistics | 2025 |
| West London Training Services Ltd | Other services | 2016 |
| Western Road Sushi Ltd | Hospitality | 2021 |
| Westmere Care Limited | Health & social care | 2026 |
| Westminister Properties Inc Limited | Households | 2023 |
| Wet-Tec Limited | Construction | 2019 |
| Wetherby 1 to 3 Limited | Households | 2017 |
| Wetherby 2 to 4 Limited | Households | 2016 |
| Wetherby Close Management Company Limited | Extraterritorial | 2014 |
| Where Light Meets Beauty Ltd | Professional & scientific | 2025 |
| Whichways Management Company Limited | Households | 1999 |
| White Nile Innovations Ltd | Transport & logistics | 2025 |
| Wholesale Premium Ltd | Wholesale & retail | 2025 |
| WHS Portsmouth Limited | Real estate | 2022 |
| Wild Essence Herbals Ltd | Wholesale & retail | 2025 |
| Wild Peacock Limited | Hospitality | 2010 |
| Wilno Ltd | Construction | 2015 |
| Wilson Harvey Limited | Real estate | 2015 |
| Wiltek Group Ltd | Administrative & support | 2022 |
| Winga Consulting Limited | Professional & scientific | 2024 |
| Winners Brothers Ltd | Wholesale & retail | 2025 |
| Winsights Group Limited | Financial services | 2025 |
| Wire Wizards Electrical Ltd | Construction | 2026 |
| Wise Accountants & Business Advisors Ltd | Professional & scientific | 2020 |
| Wkmh Internationals Limited | Wholesale & retail | 2018 |
| WKP London Ltd | Real estate | 2020 |
| WL Floorings Ltd | Construction | 2025 |
| Wonders of Grace Ministries | Other services | 2011 |
| Wood END Academy | Education | 2011 |
| Woodman & Co SET Build Ltd | Professional & scientific | 2024 |
| World IS MINE64 Limited | Manufacturing | 2023 |
| World of Hats Ltd | Wholesale & retail | 2026 |
| Worldwisetrading Ltd | Manufacturing | 2007 |
| Worth a Million Ltd | Hospitality | 2018 |
| Wsawicz Heating Ltd | Construction | 2023 |
| Wynfield Limited | Extraterritorial | 1988 |
| Xeeni Limited | Manufacturing | 2017 |
| Xelayas Ltd | Wholesale & retail | 2025 |
| Xoom Property Ltd | Real estate | 2024 |
| Xpert Building Services Limited | Construction | 2026 |
| Xpress Parts Limited | Wholesale & retail | 2025 |
| XYZ Parts Limited | Wholesale & retail | 2014 |
| Y Secrets Limited | Wholesale & retail | 2022 |
| Y&B Pure Air Duct Cleaning Services Ltd | Administrative & support | 2026 |
| Y&F Services Ltd | Transport & logistics | 2018 |
| Yadah Ltd | Public administration | 2018 |
| YAI Husain Ltd | Information & communication | 2016 |
| Yannislondon Ltd | Transport & logistics | 2019 |
| Yansh Construction Ltd | Construction | 2024 |
| YAS Fibre Solutions Ltd | Manufacturing | 2025 |
| Yeading Express Ltd | Wholesale & retail | 2020 |
| Yeading Lane Tyres Ltd | Wholesale & retail | 2022 |
| Yeees 360 Ltd | Information & communication | 2021 |
| Yelu and Company Limited | Professional & scientific | 2024 |
| Yesur Ltd | Professional & scientific | 2012 |
| Yesur Shop Ltd | Wholesale & retail | 2020 |
| Yihao Food Ltd | Administrative & support | 2016 |
| Yogi Wholesalers Ltd | Wholesale & retail | 2020 |
| Yogiraj Enterprise Limited | Real estate | 2011 |
| Yonik IVR Ltd | Construction | 2025 |
| Young Boys Limited | Other services | 2018 |
| Your Energy Advisor Limited | Information & communication | 2025 |
| Your Hairstyle Ltd | Other services | 2013 |
| Your Wish Limited | Public administration | 2022 |
| YSA &a UK Limited | Wholesale & retail | 2021 |
| YY Properties Estates Ltd | Real estate | 2026 |
| Z&P Business Solutions Ltd | Administrative & support | 2013 |
| Zaffar Management Services Ltd | Wholesale & retail | 2025 |
| Zaffar Trades Ltd | Financial services | 2025 |
| Zagros Logistics Ltd | Transport & logistics | 2026 |
| Zain Collection Limited | Wholesale & retail | 2018 |
| Zain Estates Ltd | Real estate | 2020 |
| Zainco Traders Ltd | Wholesale & retail | 2020 |
| ZAJ Investments Ltd | Wholesale & retail | 2020 |
| ZEE Cosmetics & Postsurgical Care Limited | Health & social care | 2018 |
| ZEKI32 Limited | Wholesale & retail | 2025 |
| Zeltriva Solutions Ltd | Information & communication | 2026 |
| ZGL Construction Limited | Construction | 2026 |
| Ziah & Co Ltd | Professional & scientific | 2025 |
| Zino IT Solutions Ltd | Information & communication | 2025 |
| Zizi's Bakes Limited | Wholesale & retail | 2023 |
| ZJ Compliance Limited | Health & social care | 2015 |
| ZK Olives Ltd | Hospitality | 2022 |
| Zodiac Energy Limited | Mining & quarrying | 2017 |
| Zorila Ltd | Transport & logistics | 2024 |
| ZS Electrician Limited | Construction | 2025 |
| Zstech Ltd | Information & communication | 2025 |
| Zuha's World Limited | Wholesale & retail | 2025 |
| Zuheir Consulting Ltd | Administrative & support | 2012 |
| Zulu Seven Ltd | Transport & logistics | 2018 |