| Wragg Building & Maintenance Ltd | Construction | 2006 |
| Wragg Financial Limited | Financial services | 2020 |
| Wragg Refurbishments and Repairs Limited | Construction | 2025 |
| Wray Innovation Group Ltd | Professional & scientific | 2024 |
| WRB Holdings Ltd | Financial services | 2019 |
| Wrekin Windows Limited | Extraterritorial | 1984 |
| Wright Estate Agents Ltd | Real estate | 2019 |
| Wright Logistics Solutions Limited | Transport & logistics | 2016 |
| Wright Trading Ltd | Wholesale & retail | 2016 |
| Writeseen Limited | Information & communication | 2021 |
| WRK Estates Ltd | Real estate | 2026 |
| WRM (Solihull) Holdings Limited | Financial services | 2024 |
| Wroxall Estates Limited | Extraterritorial | 2012 |
| Wroxall Private Office Limited | Professional & scientific | 2017 |
| Wroxall Roofing Ltd | Construction | 2014 |
| Wroxton House Professionals Limited | Professional & scientific | 2016 |
| WRP Ltd | Wholesale & retail | 2024 |
| Wsia Traders Limited | Wholesale & retail | 2025 |
| WSL (Property) Investment Limited | Real estate | 2015 |
| WT Bath Screens Holdings Ltd | Financial services | 2023 |
| Wulfrun Management Consultancy Limited | Professional & scientific | 2014 |
| Wulfrun Specialised Fasteners Ltd | Manufacturing | 2025 |
| Wyatt Services Limited | Administrative & support | 2025 |
| Wyckham Blackwell Group Limited | Professional & scientific | 1931 |
| Wyckham Blackwell Limited | Manufacturing | 1972 |
| Wyndley Homes Limited | Real estate | 1975 |
| Wynwest Holdings Limited | Financial services | 2020 |
| Wynwest Limited | Real estate | 1996 |
| Wythall Roofing Centre Limited | Wholesale & retail | 1984 |
| Wyvern Education Services Ltd | Education | 2007 |
| WZ Locums Limited | Health & social care | 2016 |
| WZ Realty Ltd | Real estate | 2024 |
| X2 Estates Ltd | Professional & scientific | 2024 |
| X2DESIGN Limited | Professional & scientific | 2007 |
| Xact (UK) Group Ltd | Administrative & support | 2006 |
| Xact Hire Ltd | Administrative & support | 2023 |
| Xact Homes (Holdings) Ltd | Financial services | 2022 |
| Xact Homes Limited | Financial services | 2006 |
| Xact Mortgages (Holdings) Ltd | Financial services | 2022 |
| Xact Mortgages Ltd | Financial services | 2002 |
| Xanadrome Limited | Administrative & support | 2005 |
| Xandercorp Limited | Administrative & support | 2012 |
| Xandercorp Wealth Limited | Professional & scientific | 2017 |
| Xanthia Naturals Ltd | Wholesale & retail | 2025 |
| Xcontrols Limited | Professional & scientific | 2022 |
| XE POS Ltd | Information & communication | 2014 |
| Xelcona Therapeutics Ltd | Professional & scientific | 2026 |
| Xeniam Limited | Real estate | 2021 |
| Xenith Limited | Wholesale & retail | 2000 |
| Xepay Ltd | Financial services | 2020 |
| Xfactorapp Software Solutions Limited | Wholesale & retail | 2019 |
| Xgapx Limited | Financial services | 2025 |
| Xinvest Ltd | Financial services | 2026 |
| Xixic Ltd | Construction | 2023 |
| Xonder Solutions Ltd | Financial services | 2021 |
| Xoserve Limited | Administrative & support | 2004 |
| XP Property Group Ltd | Households | 2026 |
| XPD Global UK Limited | Transport & logistics | 2024 |
| Xpeng (UK) Limited | Wholesale & retail | 2024 |
| Xpoze Limited | Information & communication | 2006 |
| Xproc Intl. Limited | Professional & scientific | 2024 |
| Xtralec Marketing Limited | Wholesale & retail | 2017 |
| Xtreme Clean Services Ltd | Administrative & support | 2022 |
| Y7 Limited | Professional & scientific | 2013 |
| Yadava Associates Ltd | Health & social care | 2023 |
| Yamini Technologies Ltd | Professional & scientific | 2010 |
| Yamyar Ltd | Health & social care | 2018 |
| Yango Tech Consulting Ltd | Information & communication | 2025 |
| Yaqubs Properties Ltd | Real estate | 2018 |
| Yaqubslogistics Ltd | Transport & logistics | 2024 |
| Yardley Fives Limited | Arts & recreation | 2018 |
| Yardley Leisure Limited | Real estate | 2017 |
| Yasashii Ltd | Wholesale & retail | 2023 |
| Yaseen Limited | Information & communication | 2013 |
| Yash Consulting Limited | Information & communication | 2015 |
| Yasmin Anderson SLT Limited | Financial services | 2024 |
| Yasuke Karate Schools Limited | Education | 2025 |
| Yates Brickwork Ltd | Construction | 2020 |
| Yates Fitness Limited | Arts & recreation | 2014 |
| Yates Group Pension Trustees Limited | Professional & scientific | 1988 |
| Yathu Group Ltd | Wholesale & retail | 2021 |
| Yaverland Limited | Professional & scientific | 1992 |
| YBB 688 Limited | Hospitality | 2026 |
| YC House Limited | Real estate | 2019 |
| Yebiga Limited | Construction | 2014 |
| Yellow Bottle Ltd | Administrative & support | 2026 |
| Yellow School BUS Company Limited | Transport & logistics | 2017 |
| Yellow Tube Limited | Professional & scientific | 2019 |
| Yellowbridge Care Company Limited | Public administration | 2025 |
| Yeoman Court Ltd | Real estate | 2019 |
| Yeomans Electrical Ltd | Construction | 2018 |
| YEW Tree Bar Limited | Other services | 2013 |
| YEW Tree Embroidery Ltd | Manufacturing | 2022 |
| YHT Services Limited | Manufacturing | 2021 |
| Yjss Ltd | Hospitality | 2024 |
| Yogiraj Limited | Wholesale & retail | 2021 |
| Yogurtworld Limited | Hospitality | 2023 |
| York Garages (Kings Heath) Limited | Real estate | 1959 |
| Yorkshire Freeholds Limited | Real estate | 1997 |
| Yorkshire Leaseholds Limited | Professional & scientific | 1989 |