| Wellness Journey Centre Ltd | Health & social care | 2024 |
| Wells CT Management Company Limited | Households | 2023 |
| Weredata Ltd | Information & communication | 2020 |
| WES Products Limited | Extraterritorial | 2017 |
| Weschem Ltd. | Wholesale & retail | 2011 |
| Wessex Business Services Ltd | Administrative & support | 2018 |
| West & Co Ventures Ltd | Construction | 2026 |
| West Care Solutions Ltd | Health & social care | 2024 |
| West END Academy Limited | Arts & recreation | 2026 |
| West Grove Associates Limited | Professional & scientific | 2011 |
| West London Heat Pumps Ltd | Construction | 2022 |
| West London Metal Merchants Limited | Water & waste | 2019 |
| West London Training Limited | Education | 1995 |
| West Meon Carpentry Limited | Construction | 2013 |
| Westech Cars Limited | Wholesale & retail | 2014 |
| Westonbury Ltd | Administrative & support | 2023 |
| Westport Grey Ltd | Construction | 2007 |
| WET Paint Solutions Ltd | Information & communication | 2010 |
| Wethink Compliance Ltd | Information & communication | 2023 |
| Wewrite Software Ltd | Information & communication | 2022 |
| Weybrooke Limited | Construction | 2011 |
| Weyside Engineering (1926) Limited | Professional & scientific | 1926 |
| WFS Psychology Ltd | Education | 2024 |
| WG Estates Limited | Real estate | 2017 |
| Wg-Uk Holding Company Limited | Professional & scientific | 2017 |
| Wheat Fork Mobile Catering Ltd | Hospitality | 2020 |
| Wheel Courtyard Cottages Limited | Real estate | 2022 |
| Wheel Farm Cottages Limited | Real estate | 2023 |
| Wheel Farmhouse Limited | Real estate | 2022 |
| Whicker Limited | Information & communication | 2020 |
| Whickerco Limited | Real estate | 2018 |
| Whipps Cross 5 Limited | Construction | 2019 |
| Whistle and Hook Limited | Administrative & support | 2013 |
| White Choice Communications Ltd | Information & communication | 2020 |
| White Choice Group Ltd | Professional & scientific | 2020 |
| White Choice Insurance Solutions Ltd | Financial services | 2018 |
| White Choice Ltd | Information & communication | 2020 |
| White Group Global Limited | Professional & scientific | 2025 |
| Whitehaven Wick Ltd | Wholesale & retail | 2021 |
| Whiterok Ltd | Professional & scientific | 2011 |
| Whites Fine Art Limited | Arts & recreation | 2019 |
| Whites Investments Limited | Professional & scientific | 2009 |
| Whites Limited | Professional & scientific | 1948 |
| Whitespace Digital Limited | Information & communication | 2016 |
| Whitewater Windows Limited | Construction | 2018 |
| Whiteworx Services Ltd. | Administrative & support | 2019 |
| Whitman Electrical Limited | Manufacturing | 2018 |
| Whitney Properties Limited | Real estate | 2014 |
| Whizbang Technologies Ltd | Information & communication | 2023 |
| Whizgen IT Systems Ltd | Information & communication | 2026 |
| WHY Creative Ltd | Professional & scientific | 2016 |
| Wicker Security Ltd | Construction | 2015 |
| Wicks and Wilson Limited | Manufacturing | 1973 |
| Wideo Limited | Administrative & support | 2016 |
| Wigtwizle Limited | Information & communication | 2024 |
| Wiii Ltd | Wholesale & retail | 2025 |
| Wild+Pure Studio Limited | Other services | 2023 |
| Wilde Trice Bugg Limited | Administrative & support | 2016 |
| Wilden Graphic Design Ltd | Administrative & support | 2017 |
| Wildflower Crafts Ltd | Manufacturing | 2023 |
| Wildflower Turf Ltd | Wholesale & retail | 2011 |
| Wildman Adventures Limited | Education | 2026 |
| Will's Meals Limited | Hospitality | 2023 |
| William Asquith (1981) Limited | Manufacturing | 1980 |
| Willow & Co (Hampshire) Ltd | Information & communication | 2015 |
| Willow & Rose Hair Studio Ltd | Other services | 2026 |
| Willow Grey Interiors Ltd | Professional & scientific | 2022 |
| Willow Lane Counselling Limited | Health & social care | 2020 |
| Willow Way Management Limited | Households | 1975 |
| Willowdene Nursery School Limited | Health & social care | 2012 |
| Willowgate Developments Limited | Real estate | 2002 |
| Willows Hospitality Group (WHG) Ltd | Hospitality | 2025 |
| Wills Chandler Limited | Professional & scientific | 2011 |
| Wilton Bennett Consultancy Limited | Construction | 2019 |
| Wilton Road Limited | Construction | 2025 |
| Wilton Spero & Partners Limited | Financial services | 2002 |
| Wilton Spero Limited | Real estate | 2006 |
| Wimpole LAB Ltd | Information & communication | 2023 |
| Winchester Automatics Limited | Arts & recreation | 1962 |
| Winchester Group Holdings Limited | Mining & quarrying | 2011 |
| Winchester Procurement Limited | Mining & quarrying | 1990 |
| Windermere Services Limited | Administrative & support | 2010 |
| Window Cleaning Basingstoke Ltd | Administrative & support | 2025 |
| Wingate Building Services Limited | Construction | 2015 |
| Winkworth Holdings Limited | Manufacturing | 2013 |
| Winkworth Machinery Limited | Manufacturing | 1993 |
| Winmill Plumbing and Heating Ltd | Construction | 2023 |
| Winser Construction Services Limited | Construction | 2015 |
| Winsome Enterprise UK Ltd | Hospitality | 2017 |
| Wise Connection Partners Ltd | Information & communication | 2020 |
| Wisemann Ltd | Construction | 2025 |
| WIT Technologies Limited | Information & communication | 2024 |
| Wittenham House Management Company Limited | Households | 1980 |
| Witton Lane Properties Limited | Real estate | 2023 |
| Wivatwist Limited | Arts & recreation | 2008 |
| Wjnjs Limited | Health & social care | 2014 |
| WL Machinery Ltd | Wholesale & retail | 2018 |
| Wmse Ltd | Manufacturing | 2019 |
| Wnnr Limited | Public administration | 2021 |
| Wolesalle UK Ltd | Wholesale & retail | 2023 |