| William Abbott Ltd | Transport & logistics | 2025 |
| William Colton Larsson Tops Ltd | Wholesale & retail | 2025 |
| William Lucy Art Advisory Ltd | Arts & recreation | 2020 |
| Williams & Harding Investments Ltd | Real estate | 2021 |
| Williams Plastering (Aylesbury) Limited | Other services | 2015 |
| Williams PUB Co. Ltd | Hospitality | 2013 |
| Willmer Limited | Administrative & support | 2013 |
| Willow Stone Investments Limited | Real estate | 2025 |
| Willow Tree Software Consulting Ltd | Professional & scientific | 2021 |
| Willow-Wills Ltd | Other services | 2026 |
| Willowcroft Property Ltd | Real estate | 2019 |
| Willows Chelsea Ltd | Wholesale & retail | 2026 |
| Wills & Gray Ltd | Health & social care | 2025 |
| Wilson and Bird Limited | Professional & scientific | 2017 |
| Wilson Case Management Service Limited | Other services | 2012 |
| Wilstone School Flats Residents Association Limited | Households | 1977 |
| Wiltoria Ltd | Wholesale & retail | 2022 |
| WIM Control Limited | Manufacturing | 1998 |
| Wimbish Solar Farm Limited | Construction | 2025 |
| WIN Consulting Limited | Information & communication | 2017 |
| Windjammer Recruitment Limited | Administrative & support | 2017 |
| Windmill Hill Asset Management Limited | Financial services | 1997 |
| Windmill View Farm Ltd | Agriculture & fishing | 2024 |
| Windrush Properties & Lets Ltd | Real estate | 2020 |
| Windrush Serco Limited | Hospitality | 2004 |
| Wingbury Farm Glamping Limited | Hospitality | 2016 |
| Wings Computer Services Limited | Professional & scientific | 2003 |
| Wings Estates Limited | Real estate | 2024 |
| Winkfield Manor (Winkfield) Management Company Ltd | Households | 2022 |
| Wins Automotive Limited | Wholesale & retail | 2026 |
| Winsight Limited | Professional & scientific | 2018 |
| Winslow Property Management Ltd | Real estate | 2025 |
| Winter Pass Limited | Hospitality | 2013 |
| Winterfell UK Bidco Limited | Financial services | 2021 |
| Winterton Holdings Limited | Financial services | 2021 |
| Wireless Apps Ltd | Administrative & support | 2015 |
| Wisdom Weavers Limited | Professional & scientific | 2025 |
| Wisemove Vehicle Movements LLP | | 2018 |
| Wish Box Online Limited | Wholesale & retail | 2020 |
| Wishan Ltd | Real estate | 2014 |
| Wismalord Limited | Real estate | 1982 |
| Witchcurse Ltd | Information & communication | 2023 |
| Without Borders Transport CIC | Transport & logistics | 2025 |
| Withwhite Ltd | Professional & scientific | 2017 |
| Withy Gardens Limited | Administrative & support | 2008 |
| Witness Direct Ltd | Information & communication | 2021 |
| WJG Distribution Limited | Transport & logistics | 2005 |
| WK Asset Investments Limited | Real estate | 2025 |
| Wkli Limited | Transport & logistics | 2025 |
| WL Sports Ltd | Wholesale & retail | 2021 |
| WM Consultancy (UK) Limited | Professional & scientific | 2003 |
| WM Property Investments Limited | Real estate | 2006 |
| WMM Properties Ltd | Real estate | 2023 |
| Woburn Ltd | Real estate | 2020 |
| Wokbang Limited | Hospitality | 2008 |
| Wokewines Ltd | Other services | 2020 |
| Wolax Interiors London Ltd | Wholesale & retail | 2016 |
| Wolfe Investments Limited | Real estate | 1995 |
| Woman in the Middle Ltd | Administrative & support | 2024 |
| Wonder International (PVT) Ltd | Real estate | 2025 |
| Wonder-Units Ltd | Real estate | 2025 |
| Wood Flooring Restoration Limited | Construction | 2015 |
| Woodboow Ltd | Manufacturing | 2024 |
| Woodlands Blinds Ltd | Wholesale & retail | 2013 |
| Woodlands Landscaping Services Ltd | Administrative & support | 2021 |
| Woodsingrp Ltd | Construction | 2025 |
| Woodway Industry Ltd | Real estate | 2013 |
| Woollaston-Webber Limited | Arts & recreation | 2019 |
| Work Leads Ltd | Information & communication | 2022 |
| Work Style Ltd | Other services | 2022 |
| Worker BEE Waitstaff Ltd | Hospitality | 2017 |
| Workout for Less Ltd | Wholesale & retail | 2011 |
| Workspace Design Ltd | Construction | 2013 |
| World Abilitysport Federation Ltd | Arts & recreation | 1992 |
| World of Construction (Bucks) Ltd | Construction | 2021 |
| World Vision Limited | Professional & scientific | 2008 |
| Worldfeast Holdings Limited | Hospitality | 2025 |
| Worldfeast Limited | Hospitality | 2025 |
| Worldwide Trading Corp Ltd | Transport & logistics | 2021 |
| Wornal Park Ltd | Real estate | 1976 |
| Worry Free GAS Ltd | Construction | 2019 |
| Wosperformance Limited | Manufacturing | 2012 |
| Wotherds Ltd | Information & communication | 2024 |
| Wottesbrooke Earthwork Solutions Limited | Professional & scientific | 2024 |
| Wotton ROW Limited | Real estate | 2005 |
| Woven Trends Limited | Wholesale & retail | 2017 |
| WR Abbott Ltd | Transport & logistics | 2026 |
| Wren & Bear Property Limited | Real estate | 2025 |
| Wright Obara Limited | Professional & scientific | 2010 |
| Wrights Waste Management Ltd | Water & waste | 2023 |
| WSE Arborfield Limited | Energy | 2014 |
| WSE Cox's Brook Limited | Energy | 2021 |
| WSG Prep 4 Less Limited | Wholesale & retail | 2024 |
| WSH Properties Limited | Real estate | 2025 |
| WSK Water Services Ltd | Water & waste | 2015 |
| WSL Academy Ltd | Administrative & support | 2022 |
| WSL Access Services Ltd | Construction | 2022 |
| WSL Holdings UK Ltd | Real estate | 2024 |
| WSL Services Ltd | Administrative & support | 2022 |
| Wsnsa Ltd | Information & communication | 2025 |