| Worksop Ltd | Wholesale & retail | 2022 |
| Workspace Technology Limited | Construction | 2004 |
| World of Workwear Limited | Other services | 2012 |
| World Street Art Limited | Arts & recreation | 2012 |
| World Wide Fittings UK Limited | Wholesale & retail | 1998 |
| Worldnet Connect Ltd | Information & communication | 2007 |
| Worley Scheps Limited | Manufacturing | 2022 |
| WP OPS (Payroll) Limited | Administrative & support | 2024 |
| WP Outsourcing (Assets) Limited | Financial services | 2024 |
| WP Outsourcing (Trading) Limited | Administrative & support | 2024 |
| WP Outsourcing Group Limited | Financial services | 2024 |
| Wpga Limited | Arts & recreation | 1986 |
| Wrekin Funeral Service Limited | Other services | 2013 |
| Wrensnest Supported Housing Ltd | Health & social care | 2002 |
| Wsa(Solihull) Ltd | Health & social care | 2008 |
| Wsnk Capital Ltd | Financial services | 2026 |
| Wtttp Ltd | Information & communication | 2017 |
| Wychbury LEE Holdings Limited | Financial services | 2024 |
| Wychnor Park (Developments) Limited | Professional & scientific | 1989 |
| Wylde and More Limited | Hospitality | 2024 |
| Wylde Green Electrical Ltd | Construction | 2026 |
| Wylde Green Estates Limited | Real estate | 2018 |
| Wylde Green Holdings Limited | Real estate | 2023 |
| Wylde Green Services Ltd | Construction | 2012 |
| Wyndham Smith Ltd | Professional & scientific | 2024 |
| Wynwood Estates Ltd | Real estate | 2020 |
| Wyson Connect Ltd | Administrative & support | 2025 |
| Wyson Group Ltd | Construction | 2024 |
| Wyvern Palm Properties Ltd | Real estate | 2022 |
| X & G Holdings Limited | Financial services | 2025 |
| X & G Limited | Real estate | 2025 |
| X 007 Limited | | 2015 |
| X D P Limited | Transport & logistics | 1995 |
| X Interiors Ltd | Other services | 2019 |
| X2FURNITURE Ltd | Wholesale & retail | 2015 |
| X2PRINT Limited | Administrative & support | 2015 |
| XA Restaurants Ltd | Hospitality | 2022 |
| Xander Real Estate Limited | Construction | 2025 |
| XAV Consulting Ltd | Information & communication | 2024 |
| XDP International Services Limited | Transport & logistics | 1997 |
| XDP Logistics Limited | Extraterritorial | 2019 |
| XDP Scotland Ltd | Administrative & support | 1997 |
| Xdp.Co.Uk Limited | Administrative & support | 2011 |
| Xgalaxy Limited | Wholesale & retail | 2024 |
| XGV Engineering Ltd | Professional & scientific | 2026 |
| Xiang XIN Properties Ltd | Real estate | 2023 |
| Xilan & Holmes Investments Ltd | Real estate | 2019 |
| XL Finance Ltd | Financial services | 2016 |
| XP Property Solutions Ltd | Real estate | 2024 |
| Xpress Salon Store Limited | Wholesale & retail | 2015 |
| XS Secure Solutions Ltd | Administrative & support | 2018 |
| Xshowhome Limited | Wholesale & retail | 2022 |
| XVR Logistics Limited | Transport & logistics | 2024 |
| Xxpand Consulting Ltd | Professional & scientific | 2021 |
| Y 333 Limited | Professional & scientific | 2013 |
| Yaaseen Limited | Health & social care | 2018 |
| Yaass Limited | Wholesale & retail | 2023 |
| YAH Group Ltd | Real estate | 2023 |
| Yahya Trading Limited | Other services | 2019 |
| Yannis Properties Limited | Real estate | 2002 |
| Yapp Psychological Services Ltd. | Administrative & support | 2015 |
| Yard 6 Consultants Limited | Professional & scientific | 2023 |
| Yard Europe Limited | Real estate | 2026 |
| Yasin Property Investment Ltd | Real estate | 2025 |
| Yates Construction Services Limited | Construction | 2025 |
| Yclp Ltd | Information & communication | 2025 |
| Yeah Agency Ltd | Arts & recreation | 2003 |
| Yearn 2B CIC | Education | 2022 |
| Yeates Properties Ltd | Real estate | 2016 |
| Yellow Design Limited | Professional & scientific | 2006 |
| YEW Holdings Limited | Extraterritorial | 2007 |
| Yfgroup Limited | Real estate | 2016 |
| Yield Land Trust Limited | Real estate | 2006 |
| Ying HUA International Ltd | Transport & logistics | 2013 |
| Yogafinity Ltd | Other services | 2019 |
| Yogojo Ltd | Wholesale & retail | 2019 |
| Yogsveta Limited | Health & social care | 2019 |
| Yorkswood (Holdings) Limited | Construction | 2020 |
| YOU Build Properties Limited | Professional & scientific | 2024 |
| YOU ME and Property Ltd | Real estate | 2024 |
| Young & Co Wealth Managment Ltd | Professional & scientific | 2016 |
| Your Business by Design Limited | Professional & scientific | 2018 |
| Your Home Your Space Ltd | Real estate | 2024 |
| Your Local Eats Ltd | Information & communication | 2025 |
| Yourlifex Limited | Information & communication | 2024 |
| Yourpm Ltd | Information & communication | 2011 |
| Yourspace Interiors Ltd | Construction | 2025 |
| Youster Installations Ltd | Construction | 2021 |
| Youster Maintenance Limited | Construction | 2024 |
| Youth Evolution Limited | Education | 2022 |
| Yovoy Limited | Information & communication | 2024 |
| YP Investments Ltd | Real estate | 2021 |
| Ypsilon Estates Group Ltd | Real estate | 2023 |
| YSS Properties Limited | Real estate | 2015 |
| YU Build Ltd | Construction | 2024 |
| Yuki Communities CIC | Arts & recreation | 2025 |
| YUM Tangs Limited | Hospitality | 2026 |
| YVD Estates Ltd | Construction | 2017 |
| YZ Solutions Limited | Transport & logistics | 2019 |
| Z Scrub Limited | Health & social care | 2022 |