| Woodford Halse Garage Limited | Wholesale & retail | 2011 |
| Woodford Kitchen Limited | Hospitality | 2023 |
| Woodford Pizza Plus Ltd | Hospitality | 2022 |
| Woodford Trailers Holdings Ltd | Financial services | 2023 |
| Woodford Trailers Limited | Manufacturing | 2001 |
| Woodhouse Toad Limited | Manufacturing | 2020 |
| Woodlands Turf Care Limited | Professional & scientific | 1990 |
| Woolman Comp UK Ltd | Administrative & support | 2021 |
| Woolstone Property Services Ltd | Real estate | 2016 |
| Words by ABI Ltd | Administrative & support | 2022 |
| Workplace International Ltd | Wholesale & retail | 2022 |
| World New Brains Sciences Academy Limited | Professional & scientific | 2021 |
| World Rise Industrial UK Ltd | Wholesale & retail | 2020 |
| Wright Bars Limited | Hospitality | 2023 |
| Wright's Refurb Ltd | Real estate | 2023 |
| Wuxi Feiyu Plastic Co., Ltd | Professional & scientific | 2015 |
| Wwap Ltd | Wholesale & retail | 2022 |
| X2ABX Limited | Wholesale & retail | 2016 |
| Xanadox Technologies Limited | Manufacturing | 2014 |
| Xanadu Neuro-Motives Ltd | Information & communication | 2026 |
| Xcenter Technologies Ltd | Information & communication | 2026 |
| Xetrov Energy Limited | Water & waste | 2018 |
| Xetrov Industries Ltd | Manufacturing | 2016 |
| Xetrov Property 2 Ltd | Real estate | 2021 |
| Xetrov Property Limited | Real estate | 1984 |
| Xetrov Services Limited | Manufacturing | 2021 |
| Xilly G Ltd | Wholesale & retail | 2021 |
| XPLUS2 Living Ltd | Real estate | 2023 |
| XPLUS2 Property Investment Ltd | Real estate | 2023 |
| Xpress Automotive Limited | Other services | 2023 |
| YA Stationery Limited | Extraterritorial | 2012 |
| Yakim Logistics Ltd | Transport & logistics | 2023 |
| YAL Devi Masala (P) Ltd. | Wholesale & retail | 2016 |
| Yantai M and K Foods Co., Ltd | Agriculture & fishing | 2025 |
| Yard Nine Consulting Limited | Professional & scientific | 2023 |
| Yidong Holdings Limited | Professional & scientific | 2008 |
| Yiwu Alslam Int'L Trading Limited | Professional & scientific | 2022 |
| Yogiraj Stores Ltd | Wholesale & retail | 2026 |
| York Barbell (U.K.) Limited | Arts & recreation | 1980 |
| YOU & ME Property Limited | Real estate | 2023 |
| Youcore Ltd | Professional & scientific | 2025 |
| Young Angels Care Ltd | Health & social care | 2025 |
| Young Babo Limited | Construction | 2023 |
| Your Career Journey Ltd | Education | 2016 |
| Your Choice Mortgage Solutions Limited | Financial services | 2020 |
| Your Wedding Directory Limited | Administrative & support | 2025 |
| Yourell Enterprises Ltd | Arts & recreation | 2022 |
| Zaheer Ltd | Wholesale & retail | 2024 |
| Zanfei Trading Ltd | Professional & scientific | 2024 |
| Zarfeen Group Limited | Administrative & support | 2007 |
| Zayfi Group Ltd | Wholesale & retail | 2025 |
| ZDG Trans Ltd | Transport & logistics | 2016 |
| ZE Daventry 1 Ltd | Hospitality | 2025 |
| Zellure Aesthetics Ltd | Other services | 2024 |
| Zepic Limited | Wholesale & retail | 2021 |
| Zest Hearing Care Ltd | Wholesale & retail | 2022 |
| Zinxan AI Ltd | Information & communication | 2020 |
| Zion Soln Ltd | Information & communication | 2019 |
| Zogjani Ltd | Professional & scientific | 2023 |
| ZST Trader Ltd | Transport & logistics | 2025 |
| Zukeo Limited | Wholesale & retail | 2008 |
| Zukhurova Healthcare Services Limited | Health & social care | 2015 |
| Zwchange Ltd | Administrative & support | 2022 |