| Wolnik Ltd | Professional & scientific | 2012 |
| Wombar Limited | Professional & scientific | 2006 |
| Women in Data Ltd | Other services | 2022 |
| Wonders of the Artistic Mind (WAM) Ltd | Education | 2025 |
| Woodbridge Dental Surgery Limited | Health & social care | 2010 |
| Woodchurch House Limited | Health & social care | 2011 |
| Woodcote Software Limited | Professional & scientific | 2004 |
| Woodentimeuk Ltd | Wholesale & retail | 2025 |
| Woodhay & Chase Ltd | Professional & scientific | 2021 |
| Woodland Bookkeeping Ltd | Professional & scientific | 2024 |
| Woodlands Bodyshop Limited | Wholesale & retail | 2023 |
| Woodlands Management Company (Chineham) Limited | Households | 1990 |
| Woodpecker Consultancy Ltd | Professional & scientific | 2021 |
| Woods Russell Limited | Professional & scientific | 2016 |
| Woof Daddy Limited | Extraterritorial | 2022 |
| Woogle Wares Ltd | Wholesale & retail | 2025 |
| Words & Gestures Limited | Extraterritorial | 2011 |
| Wordvalley Global Ltd | Information & communication | 2025 |
| Workplace Relocation Consulting Limited | Administrative & support | 2015 |
| World Range Move Ltd | Transport & logistics | 2026 |
| Worry Less Design Ltd | Wholesale & retail | 2017 |
| Worting Business Park Limited | Construction | 1988 |
| Wotive Ltd | Information & communication | 2021 |
| WOW AV Installations Ltd | Other services | 2013 |
| Wren Environmental Limited | Administrative & support | 1991 |
| Wright Quality Limited | Professional & scientific | 2023 |
| Wrights Automotive Limited | Wholesale & retail | 2023 |
| Wrobel Ltd | Wholesale & retail | 2025 |
| WSC Limited | Professional & scientific | 2022 |
| Wscs International Limited | Wholesale & retail | 2011 |
| WTB Development Co. Ltd. | Real estate | 1995 |
| Wulf Cafe Ltd | Hospitality | 2025 |
| Wyeth Digital Limited | Manufacturing | 1998 |
| Wyeth Signs Limited | Professional & scientific | 2024 |
| Wyvern Legal Services Limited | Professional & scientific | 1990 |
| WZ Management Limited | Real estate | 2022 |
| X Property Holdings Ltd | Real estate | 2019 |
| X-On Health Limited | Information & communication | 1991 |
| X.Xix Ltd | Wholesale & retail | 2020 |
| Xact Engineering Ltd | Professional & scientific | 2025 |
| Xanberu Project Solutions Ltd | Professional & scientific | 2018 |
| Xbour Ltd | Water & waste | 2026 |
| XCD HR Limited | Information & communication | 2010 |
| Xclusive Business Solutions Limited | Wholesale & retail | 2005 |
| Xclusive Cars Basingstoke Ltd | Transport & logistics | 2023 |
| Xclusive Homes Limited | Real estate | 2021 |
| Xeron Technologies LLP | | 2021 |
| Xeva Limited | Administrative & support | 2002 |
| XHL Ltd | Construction | 2025 |
| Xinglongfa UK Ltd | Hospitality | 2020 |
| Xona Direct Ltd | Wholesale & retail | 2009 |
| Xona Limited | Information & communication | 2009 |
| XTE Consultancy Ltd | Professional & scientific | 2024 |
| Xtract Designs Limited | Information & communication | 1998 |
| Xtreme Controls Ltd | Information & communication | 2016 |
| Xylene Engineering Services Ltd | Manufacturing | 2018 |
| Y2S Property Services Ltd | Real estate | 2025 |
| Yaji UK Limited | Administrative & support | 2025 |
| Yako Services Limited | Health & social care | 2018 |
| Yamphu Clean & Color Ltd | Administrative & support | 2025 |
| YAN & DAM Ltd | Hospitality | 2025 |
| Yanis & Daddy Speed Ltd | Transport & logistics | 2026 |
| Yardmon Ltd | Professional & scientific | 2009 |
| Yarsi Holding Limited | Hospitality | 2026 |
| Yasar Handyman Ltd | Construction | 2022 |
| Yasen Surgery Ltd | Health & social care | 2025 |
| YCY Trans Ltd | Transport & logistics | 2018 |
| Yilmaz Construction Limited | Construction | 2022 |
| Yocasa Hospitality Management Limited | Health & social care | 2024 |
| Yoga Huts Limited | Information & communication | 2018 |
| Yogvibe Ltd | Hospitality | 2025 |
| York Telecom Limited | Information & communication | 2006 |
| Yorkwood Bathrooms Limited | Construction | 2021 |
| Yorkwood Kitchens Limited | Manufacturing | 2025 |
| YOU Click WE Ship Ltd | Wholesale & retail | 2023 |
| You'Re NOT Alone Limited | Public administration | 2021 |
| Young Ballerz Academy Ltd | Arts & recreation | 2020 |
| Young Business Consulting Limited | Professional & scientific | 2001 |
| Young Engineers Basingstoke & Deane Ltd | Education | 2025 |
| Younginmind Community Interest Company | Manufacturing | 2024 |
| Your Build Solutions Limited | Construction | 2017 |
| Your Credit Manager Limited | Administrative & support | 2008 |
| Your Phone Care Limited | Wholesale & retail | 2013 |
| Yourbodyguru Ltd | Arts & recreation | 2021 |
| Yours Plumbing and Heating Limited | Construction | 2018 |
| Yoyotech Limited | Manufacturing | 2013 |
| YRF Properties Ltd | Real estate | 2025 |
| YUM YUM (UK) Limited | Hospitality | 2011 |
| Yuzu Pan-Asian Limited | Hospitality | 2025 |
| Zaapto Ltd | Information & communication | 2026 |
| Zafrix Limited | Wholesale & retail | 2025 |
| Zaroli Limited | Manufacturing | 2019 |
| Zasa Holdings Ltd | Real estate | 2026 |
| ZAY ZAY Limited | Real estate | 2015 |
| ZB Building Services Ltd | Construction | 2019 |
| Zeal Events Limited | Administrative & support | 2012 |
| ZEN Care Ltd | Health & social care | 2023 |
| Zenapex Energy International Company Ltd | Mining & quarrying | 2022 |
| Zenith Business Services Limited | Information & communication | 2017 |
| Zeno Ventures Limited | Other services | 2026 |