| Wattpower ERG Engine System Limited | Arts & recreation | 2019 |
| WBS Services (Oxford) Ltd | Construction | 2022 |
| Wdid Ltd | Professional & scientific | 2021 |
| WDS Refurbishment Ltd | Construction | 2010 |
| WE LUV Cake Community Interest Company | Manufacturing | 2026 |
| WE Repair Tech Limited | Administrative & support | 2004 |
| WE Tutor YOU Ltd | Education | 2025 |
| Wealthouse Finance Limited | Professional & scientific | 2023 |
| Web Frame Limited | Information & communication | 2019 |
| Webber's Carpentry Ltd | Construction | 2021 |
| Webgro Ltd | Professional & scientific | 2017 |
| Websbabs Limited | Education | 2017 |
| Weekicks Franchising Ltd | Administrative & support | 2023 |
| Weempire Ltd | Wholesale & retail | 2022 |
| Welbeck Investment Partnership Limited | Financial services | 2013 |
| Well Child Haven Ltd | Health & social care | 2025 |
| Wellington Cabs Limited | Transport & logistics | 2016 |
| Wellington Executives Limited | Other services | 2016 |
| Wells Old Windsor (Properties) Limited | Construction | 1953 |
| Wensons Financial Ltd | Other services | 2015 |
| Wentworth Assets Limited | Real estate | 2018 |
| Wesco Anixter Pension Scheme Limited | Financial services | 2025 |
| Wesco Anixter Pension Scheme Trustees Limited | Financial services | 2025 |
| Wesco Anixter UK Limited | Wholesale & retail | 1930 |
| West END Farm MOT Ltd | Wholesale & retail | 2016 |
| West END Farm Stables Trading Ltd | Hospitality | 2026 |
| Westlake Construction Limited | Real estate | 1998 |
| Weston Procurement Ltd | Professional & scientific | 2015 |
| Wetlands Irrigation Limited | Construction | 2019 |
| Wetlands Irrigation Maintenance Limited | Manufacturing | 2022 |
| WH Hair and Beauty Ltd | Other services | 2019 |
| WHATSBEST4U Ltd | Wholesale & retail | 2024 |
| Wheal TOR Trading Ltd | Hospitality | 2026 |
| Whilde Automotive Ltd | Wholesale & retail | 2020 |
| Whisper Technologies Ltd | Information & communication | 2025 |
| White Cottage Property Ltd | Households | 2020 |
| White Leaf Ceramics Limited | Manufacturing | 2015 |
| White Rabbit Pictures Limited | Information & communication | 2023 |
| Wicked Waggles Ltd | Other services | 2022 |
| Wiklak Limited | Transport & logistics | 2016 |
| Wild Hazel Ltd | Manufacturing | 2026 |
| Wild Water Services Limited | Professional & scientific | 2000 |
| Wildridings Limited | Health & social care | 2009 |
| Wildriver Publications Ltd | Information & communication | 2018 |
| Willow Legal Consulting Ltd | Professional & scientific | 2022 |
| Willy Dog Ltd | Hospitality | 2019 |
| Wilsons Farm Shop Ltd | Wholesale & retail | 2026 |
| Wimbledon WMP Limited | Arts & recreation | 2020 |
| WIN OT Ltd | Health & social care | 2023 |
| Windowdoc Limited | Construction | 2010 |
| Windsor Forest Mews Limited | Real estate | 2016 |
| Windsor Hockey Club Ltd | Arts & recreation | 2026 |
| Winkfield Park Polo Club Ltd | Arts & recreation | 2020 |
| Wisdom Control Limited | Professional & scientific | 2013 |
| Wise Renovation Ltd | Construction | 2017 |
| Witham Valley Care Group Limited | Health & social care | 2008 |
| Wizdom Westlake Ltd | Professional & scientific | 2024 |
| WLK Transport Ltd | Transport & logistics | 2025 |
| Woking Pizza Shop Limited | Hospitality | 2019 |
| Wokingham & Binfield Landscaping Ltd | Administrative & support | 2026 |
| Wokingham IT Limited | Information & communication | 2019 |
| Wokingham Pools and Spas Limited | Households | 2002 |
| Wokingham Sushi Limited | Hospitality | 2023 |
| Woman Unlimited CIC | Administrative & support | 2026 |
| Woodchips Limited | Agriculture & fishing | 2014 |
| Woodcock Hall Cottage Limited | Real estate | 2025 |
| Wooden Built Ltd | Manufacturing | 2022 |
| Woodhurst Developments and Construction Limited | Construction | 2024 |
| Woodside Panel and Paint Ltd | Wholesale & retail | 2017 |
| Woodwings Carpentry Ltd | Other services | 2018 |
| Worldwide Engagement Limited | Wholesale & retail | 2015 |
| Worth Talking Limited | Health & social care | 2018 |
| WP Carpentry & Building Ltd | Construction | 2019 |
| WP Fire Safety Limited | Public administration | 2024 |
| Wren Trading Limited | Professional & scientific | 1991 |
| Wright Financial Services Limited | Professional & scientific | 2025 |
| WTC Electronics Limited | Manufacturing | 2010 |
| WW Media Management Ltd | Administrative & support | 2020 |
| Www.Teachertrainingvideos.Com. Ltd | Information & communication | 2014 |
| Wynning Limited | Professional & scientific | 2009 |
| X777 Properties Ltd | Real estate | 2024 |
| Xarma Limited | Information & communication | 2022 |
| XEE Sun Limited | Wholesale & retail | 2024 |
| Xixi-Fairy Limited | Administrative & support | 2018 |
| XL ENG Ltd | Professional & scientific | 2024 |
| Xplore Global Ltd | Professional & scientific | 2016 |
| Xpress Messenger-Guildford LLP | | 2007 |
| Xtralis (UK) Limited | Wholesale & retail | 1989 |
| Xtralis Holdings UK Limited | Manufacturing | 2006 |
| Xtralis Security Holdings Limited | Manufacturing | 2014 |
| Y Foel Limited | Extraterritorial | 2024 |
| Y&T Harmony Ltd | Manufacturing | 2015 |
| Y2 Solutions Ltd | Transport & logistics | 2018 |
| Yahvi Properties Ltd | Real estate | 2023 |
| YAN Shun Holdings Limited | Real estate | 2024 |
| Yana LA Bella Ltd | Extraterritorial | 2026 |
| Yara Labs Ltd | Information & communication | 2026 |
| Yardley Building Contractors Limited | Construction | 2017 |
| Yellow Brick House Nursery Limited | Education | 2007 |
| Yellow Octopus Locksmith Limited | Manufacturing | 2023 |