| Wrest Park (Holdings) Ltd | Construction | 2025 |
| Wright and Associates Limited | Professional & scientific | 2012 |
| WRS Building Contractors Ltd | Construction | 2020 |
| WS Bars Ltd | Hospitality | 2019 |
| WS Cars Ltd | Wholesale & retail | 2025 |
| WSL Logistic Group Ltd | Transport & logistics | 2016 |
| Wsol Services Provider Ltd | Manufacturing | 2026 |
| WT Construction UK Ltd. | Construction | 2008 |
| Wths - Youths C.I.C. | Education | 2023 |
| WU Family Chinese Restaurant Ltd | Hospitality | 2020 |
| WUN Universal Records Limited | Information & communication | 2026 |
| Wura Limited | Real estate | 2025 |
| WWG Contractor Ltd | Construction | 2014 |
| Wychpery Consulting Limited | Professional & scientific | 2016 |
| Wylcot Ltd | Administrative & support | 2017 |
| Wylye Distillery Ltd | Manufacturing | 2021 |
| Wyngz E14 Ltd | Hospitality | 2021 |
| Wynne Lewis Education LLP | | 2024 |
| Wyreframe Limited | Information & communication | 2021 |
| WZ Chauffeurs Ltd | Wholesale & retail | 2024 |
| X-4RCE CIC | Health & social care | 2023 |
| X-Qsite Pastries and Foods Ltd | Manufacturing | 2026 |
| X8R Motors Limited | Wholesale & retail | 2025 |
| XAH Ltd | Transport & logistics | 2018 |
| XAL Trans Ltd | Wholesale & retail | 2020 |
| Xander & Bell Ltd | Professional & scientific | 2026 |
| Xanders Services International Limited | Health & social care | 2021 |
| Xanthrons Ltd | Wholesale & retail | 2024 |
| Xara SHA Enterprise Limited | Wholesale & retail | 2026 |
| Xark Ltd | Wholesale & retail | 2024 |
| Xarphis&Gratia Living Limited | Real estate | 2022 |
| Xaymaca Bakery Ltd | Manufacturing | 2026 |
| Xboga Ltd | Wholesale & retail | 2025 |
| Xbsol Ltd | Professional & scientific | 2021 |
| Xcel Athletic Ltd | Wholesale & retail | 2025 |
| Xcoby Creatives Ltd | Manufacturing | 2025 |
| Xdiavel Ltd | Wholesale & retail | 2020 |
| Xebraa Tech Ltd | Wholesale & retail | 2023 |
| Xeferas Ltd | Manufacturing | 2019 |
| Xelgata Ltd | Wholesale & retail | 2021 |
| Xemil Technologies Ltd | Information & communication | 2015 |
| XF Internetsolution Ltd | Wholesale & retail | 2024 |
| Xfurth Ltd. | Manufacturing | 2002 |
| Xhema Limited | Transport & logistics | 2024 |
| Xhoka Property Limited | Real estate | 2025 |
| XIM Services Ltd | Transport & logistics | 2016 |
| Xixin (19IN) Limited | Professional & scientific | 2004 |
| XK Contractors Ltd | Construction | 2022 |
| Xkail Ltd | Administrative & support | 2024 |
| XP Trading Ltd | Construction | 2025 |
| Xpartedge Limited | Information & communication | 2011 |
| Xpress Personnel Solutions Limited | Professional & scientific | 2022 |
| Xpressions Aesthetics Limited | Other services | 2025 |
| Xpressions Couture Limited | Wholesale & retail | 2020 |
| Xpressions Enhancement Clinic Limited | Other services | 2015 |
| Xpressions Group Holdings Limited | Construction | 2025 |
| Xquisite Cruises Limited | Administrative & support | 2024 |
| Xrayy Ltd | Wholesale & retail | 2026 |
| XRP Developments Ltd | Construction | 2019 |
| Xtensible Logix Ltd | Information & communication | 2014 |
| Xtranet Technologies Ltd | Information & communication | 2019 |
| Xtreme Comfort Ltd | Transport & logistics | 2026 |
| Xtreme Commerce Ltd | Wholesale & retail | 2025 |
| Xtreme Landscaping Ltd | Administrative & support | 2024 |
| Xtreme Marketing Limited | Administrative & support | 2015 |
| Xxpressions Ltd | Administrative & support | 2025 |
| Xybern Ltd | Information & communication | 2025 |
| Xyla Aqsa Premium White Rice Limited | Wholesale & retail | 2025 |
| XYZ Services Limited | Transport & logistics | 2023 |
| Y & a Motors Limited | Wholesale & retail | 2018 |
| Y O S House of Logistic Ltd | Information & communication | 2018 |
| Y Y P Properties Limited | Real estate | 2016 |
| Y&K Miah Ltd | Wholesale & retail | 2026 |
| Y.K Property Investments Limited | Real estate | 2026 |
| Y23MAH Holdings Ltd | Real estate | 2025 |
| YAD Luton Ltd | Hospitality | 2025 |
| Yahmenachami Ltd | Financial services | 2026 |
| Yahozerli Ltd | Financial services | 2026 |
| Yahustephan Limited | Real estate | 2015 |
| Yahya Travel & Services Ltd | Administrative & support | 2024 |
| Yahyaz Ltd | Professional & scientific | 2022 |
| YAK Travel Limited | Administrative & support | 2012 |
| Yakamoz Meze Bar Limited | Hospitality | 2022 |
| Yakamoz Studio Design Ltd | Arts & recreation | 2024 |
| Yalman Logistics Ltd | Transport & logistics | 2024 |
| YAM Ltd | Wholesale & retail | 2026 |
| Yannis Grecu Ltd | Construction | 2018 |
| YAP Technology Limited | Wholesale & retail | 2018 |
| Yapbox Limited | Extraterritorial | 2009 |
| Yappi International Limited | Wholesale & retail | 2024 |
| YAQ Care Ltd | Health & social care | 2026 |
| Yaqsmotors Ltd | Wholesale & retail | 2025 |
| Yarborough Flat Management Company Limited | Households | 1977 |
| Yardley House (Maintenance) Limited | Households | 1964 |
| Yarhm Ltd | Transport & logistics | 2024 |
| Yarservices Ltd | Manufacturing | 2026 |
| Yarz Limited | Hospitality | 2024 |
| YAS Building Contractors Ltd | Construction | 2021 |
| Yas's Mens Grooming Ltd | Other services | 2023 |
| Yasad Ltd | Construction | 2026 |