| Westbrook Go Limited | Information & communication | 2025 |
| Westcliff Security Solutions Ltd | Administrative & support | 2022 |
| Westcrown Investments (Holdings) Limited | Financial services | 2020 |
| Westcrown Investments Limited | Financial services | 2016 |
| Westcrystal Holdings Ltd | Professional & scientific | 2026 |
| Western Education Limited | Education | 2019 |
| Westford Integrated Services Ltd | Administrative & support | 2026 |
| Wextons Limited | Real estate | 2014 |
| WG Construction Service Ltd | Construction | 2016 |
| Wharfstreet Developments Ltd | Real estate | 2003 |
| Whataproducts Limited | Wholesale & retail | 2023 |
| Whipp Chauffeurs Ltd | Transport & logistics | 2019 |
| Whippin in the Kitchen Ltd | Hospitality | 2020 |
| Whisk & SIP Ltd | Manufacturing | 2025 |
| Whisper's of OUD Ltd | Manufacturing | 2024 |
| Whispered Wisdom Ltd | Health & social care | 2024 |
| White Dome Limited | Real estate | 2024 |
| White Eagles Security and Network Company Ltd | Information & communication | 2025 |
| White Fast Ltd | Administrative & support | 2024 |
| White Label Welding Services Limited | Manufacturing | 2025 |
| White Lily Bridal Ltd | Wholesale & retail | 2025 |
| White Rock Financial Consultancy Limited | Professional & scientific | 2019 |
| White Town Limited | Other services | 2006 |
| White Weaver Accountants Ltd | Professional & scientific | 2019 |
| Whitehouse Investments London Limited | Administrative & support | 2010 |
| Whitekettles Limited | Construction | 2024 |
| Whizz Ventures Limited | Wholesale & retail | 2009 |
| WIC Property Ltd | Real estate | 2021 |
| Wicked N OUT Ltd | Hospitality | 2025 |
| Wickmann Limited | Wholesale & retail | 2010 |
| Wide Way Care Limited | Health & social care | 2001 |
| Widespread Services Limited | Health & social care | 1998 |
| Wideway Cargo Care Limited | Transport & logistics | 2009 |
| Wideway Nursing Services Limited | Administrative & support | 2012 |
| Wija Care Homes Ltd | Health & social care | 2024 |
| Will and White Ltd | Education | 2025 |
| Wilmart Utilities Limited | Manufacturing | 2015 |
| Wilmingtons Marketing Limited | Administrative & support | 2018 |
| Wilmot Brown Ltd | Administrative & support | 2022 |
| Wilsons Solicitors (UK) Limited | Professional & scientific | 2014 |
| Window Cleaner Tech Ltd | Administrative & support | 2025 |
| Windy Autos Ltd | Wholesale & retail | 2013 |
| Windy Systems Limited | Information & communication | 2014 |
| Wingate Food Service Ltd | Professional & scientific | 2016 |
| Wingfixx Ltd | Hospitality | 2021 |
| Wings Private Limited | Hospitality | 2024 |
| Winsome Fashion Limited | Wholesale & retail | 2019 |
| WIO Labs Ltd | Information & communication | 2026 |
| Wiqn Limited | Wholesale & retail | 2025 |
| Wisdomfort Ltd | Real estate | 2024 |
| Wise 18 Ltd | Education | 2014 |
| Wise Glazing & Home Improvements Ltd | Construction | 2021 |
| Withington Estates Limited | Real estate | 2015 |
| Wiz.Link Ltd | Information & communication | 2024 |
| WJC Music Group Ltd | Information & communication | 2024 |
| Wmf(Uk) Ltd | Manufacturing | 2015 |
| Women Empowerment and Development Organisation Ltd | Health & social care | 2026 |
| Wondaful GRP Limited | Wholesale & retail | 2024 |
| Wondastores Limited | Wholesale & retail | 2024 |
| Wood Made Ltd | Construction | 2023 |
| Woodbridge Healthcare Limited | Health & social care | 2022 |
| Wooden World Ltd | Wholesale & retail | 2016 |
| Woodgrange Property Limited | Real estate | 2025 |
| Woodpeckerbath Ltd | Wholesale & retail | 2023 |
| Woodpeckersauna Limited | Wholesale & retail | 2023 |
| Worcester Consultants Limited | Professional & scientific | 2022 |
| World Class Academia Ltd | Education | 2021 |
| World Class Education Group Limited | Education | 2026 |
| World Refugee Network CIC | Professional & scientific | 2024 |
| Worldmart Solutions Ltd | Education | 2023 |
| Worlds Quests Ltd | Arts & recreation | 2019 |
| Worldwide Mobile Tech Limited | Other services | 2020 |
| WOW Party Supplies Ltd | Wholesale & retail | 2013 |
| Wowsom Ltd | Wholesale & retail | 2024 |
| Wrap Masters LDN Ltd | Hospitality | 2026 |
| Wrong CHA Ltd | Hospitality | 2026 |
| WSG Limited | Education | 2002 |
| Wssila Ltd | Other services | 2017 |
| Wygetarts Ltd | Professional & scientific | 2026 |
| Wyse Choice Ltd | Health & social care | 2014 |
| X-B Construction Ltd | Construction | 2017 |
| Xabul Limited | Information & communication | 2024 |
| Xcel Accounting Solutions Ltd | Professional & scientific | 2009 |
| Xclusive Auto Centre Ltd | Wholesale & retail | 2021 |
| XD Property Rental Ltd | Real estate | 2020 |
| Xgadgets Ltd | Other services | 2024 |
| XI Edition Limitee Ltd | Wholesale & retail | 2025 |
| Xienskin Ltd | Other services | 2026 |
| Xilef Nextz Limited | Construction | 2024 |
| XLB Properties Ltd | Real estate | 2025 |
| Xone.Io Ltd | Transport & logistics | 2025 |
| Xoom Tech Ltd | Information & communication | 2018 |
| Xpress Mobile Tyres Services Limited | Wholesale & retail | 2025 |
| Xpress Xchange Ltd | Other services | 2019 |
| Xquisite Bakez Limited | Hospitality | 2024 |
| Xrez Ltd | Information & communication | 2026 |
| XSH Ltd | Wholesale & retail | 2021 |
| Xtremeclean Eco Ltd | Administrative & support | 2020 |
| Y & M Global Ltd | Administrative & support | 2025 |
| Y K (UK) Limited | Wholesale & retail | 2004 |