| Woodins Cooling Services Ltd | Construction | 2021 |
| Woodland Plumbing and Heating Limited | Wholesale & retail | 2025 |
| Woodland Traiding Ltd | Wholesale & retail | 2024 |
| Woodlands Heating and Plumbing Ltd | Wholesale & retail | 2026 |
| Woodlands Rescue Ltd | Wholesale & retail | 2021 |
| Woodleas Camping Ltd | Hospitality | 2023 |
| Woodleas Farm Ltd | Wholesale & retail | 2019 |
| Woodpecker Carpentry (Southern) Ltd | Administrative & support | 2010 |
| Woodpecker Carpentry and Joinery Limited | Construction | 2002 |
| Woodpecker Interview Simulations Ltd | Other services | 2025 |
| Woodpeckers of Kent Ltd | Administrative & support | 2017 |
| Woodstock (Kent) Limited | Wholesale & retail | 2021 |
| Woodstock Construction Ltd | Construction | 2019 |
| Woodthorpe Road Management Company Limited | Households | 1995 |
| Woodvale Homes Limited | Construction | 2016 |
| Woodyard Holdings Limited | Construction | 2023 |
| Woodys Carpentry Ltd | Construction | 2021 |
| Woolpack Smeeth Limited | Hospitality | 2019 |
| Wootton Investments Ltd | Construction | 2020 |
| Word Bohemia Ltd | Other services | 2015 |
| WORKCOSTSR4U Limited | Extraterritorial | 2020 |
| Working Assets Search Limited | Professional & scientific | 2013 |
| Workplace Partnerships Ltd | Administrative & support | 2026 |
| Works of Heart Ltd | Other services | 2025 |
| Workspa Ltd | Other services | 2018 |
| World Cargo Consolidators Limited | Transport & logistics | 2004 |
| World Cargo Logistics Ltd | Transport & logistics | 2000 |
| World of Solutions Ltd | Professional & scientific | 2020 |
| World of the Wings Ltd | Hospitality | 2023 |
| Worldgift Trading Limited | Wholesale & retail | 2018 |
| Worldgift.Com Limited | Wholesale & retail | 2010 |
| Worth Investments Limited | Wholesale & retail | 2023 |
| Worthy Clinic Medical Suite Limited | Health & social care | 2023 |
| Wotton Trading Estate Management Company Limited | Households | 1995 |
| WOW Tools Limited | Wholesale & retail | 2025 |
| WP Hinckley Ltd | Real estate | 2010 |
| WPG Solutions Ltd | Professional & scientific | 2007 |
| WPS (London) Limited | Construction | 2018 |
| WR Real Assets Limited | Real estate | 2025 |
| WR Sports Club | Arts & recreation | 2012 |
| Wraik Hill Recycling Limited | Administrative & support | 2023 |
| Wren and Heath Co. Ltd | Financial services | 2023 |
| Wrench Limited | Wholesale & retail | 2013 |
| Wrench Studios Limited | Wholesale & retail | 2014 |
| Wrens Holdings Limited | Real estate | 2025 |
| Wrenstar Properties Limited | Real estate | 1985 |
| WRH Maintenance Limited | Construction | 2026 |
| Wright Advisory Ltd | Professional & scientific | 2021 |
| Wrighttek Engineering Ltd | Professional & scientific | 2025 |
| Wshel Ltd | Construction | 2025 |
| WSM Utilities Limited | Administrative & support | 2009 |
| WSR 58 Ltd | Real estate | 2022 |
| Wuuden LLP | | 2024 |
| WW Home Solutions Limited | Construction | 2017 |
| WW Media Solutions Limited | Administrative & support | 2024 |
| WYE & Wilder Ltd | Hospitality | 2019 |
| WYE Active CIC | Other services | 2019 |
| WYE Coffee Shop Limited | Hospitality | 2019 |
| WYE College Regeneration Group CIC | Health & social care | 2020 |
| WYE Consult & Design Ltd | Information & communication | 2019 |
| WYE Fish & Chips Ltd | Hospitality | 2025 |
| WYE Motors Limited | Wholesale & retail | 2017 |
| Wyework Ltd | Real estate | 2026 |
| Wynng Ltd | Wholesale & retail | 2022 |
| Wyvern Court Freehold Limited | Real estate | 2011 |
| X-One Wholesale Limited | Transport & logistics | 2006 |
| X2 Express Logistics Heathrow Ltd | Transport & logistics | 2024 |
| X2 Express Logistics Limited | Transport & logistics | 2015 |
| Xavgh & Co Limited | Real estate | 2021 |
| Xavier & Partners Limited | Real estate | 2018 |
| XAX Properties Limited | Construction | 2017 |
| XCM Limited | Financial services | 2025 |
| Xdream Ltd | Wholesale & retail | 2013 |
| Xeltem Solutions Ltd | Other services | 2015 |
| Xenophon College London Limited | Education | 2015 |
| Xepure UK Holding Ltd | Financial services | 2025 |
| Xepure UK Ltd | Water & waste | 2025 |
| XF Holdings UK Limited | Arts & recreation | 2019 |
| Xiroi Limited | Professional & scientific | 2023 |
| Xisys Ltd | Information & communication | 2016 |
| XL Pools Limited | Construction | 2004 |
| Xmas Tree AID Ltd | Other services | 2017 |
| XO Classic Cars Limited | Wholesale & retail | 2013 |
| Xoset Limited | Construction | 2018 |
| XP Cars Limited | Transport & logistics | 2010 |
| XQ Ventures Ltd | Professional & scientific | 2026 |
| XS Group Ltd | Manufacturing | 2023 |
| Xscream Escapes Ltd | Administrative & support | 2018 |
| XT Biomed Limited | Manufacturing | 2021 |
| Xtech Edge Ltd | Information & communication | 2023 |
| Xtensys Limited | Information & communication | 2015 |
| Xtrafit 1 Limited | Arts & recreation | 2019 |
| Xtrafit 2 Limited | Arts & recreation | 2020 |
| XTW Ltd | Health & social care | 2018 |
| Xylys Solutions Limited | Information & communication | 2010 |
| Y&S1 Drive Ltd | Transport & logistics | 2023 |
| Y.Kubinska Ltd | Real estate | 2020 |
| YA Builder Brothers Ltd | Construction | 2026 |
| Yabar Ltd | Wholesale & retail | 2024 |
| Yaho Leleika Limited | Wholesale & retail | 2025 |