| Wildcards Services Limited | Professional & scientific | 2024 |
| Wilde and Free Wellness Ltd | Real estate | 2026 |
| William Clarence Education Ltd | Administrative & support | 2012 |
| Williamson Gravatt Ltd | Professional & scientific | 2024 |
| Wilma Woods Physiotherapy Ltd | Other services | 2020 |
| Wilson Law Limited | Professional & scientific | 2024 |
| Wilson Stone Consulting Ltd | Professional & scientific | 2024 |
| Window Fleur Ltd | Wholesale & retail | 2019 |
| Wing KIT Chan Ltd | Professional & scientific | 2025 |
| Wings to FLY Limited | Health & social care | 2016 |
| Winter Hill Estates Ltd | Real estate | 2026 |
| Winter House RTM Company Limited | Households | 2018 |
| Winter Media Limited | Information & communication | 2012 |
| Wise Cat Limited | Professional & scientific | 2014 |
| Wise PIG Marketing Ltd | Professional & scientific | 2024 |
| Wizard Applications Limited | Information & communication | 2012 |
| Wizard Toys Limited | Manufacturing | 1997 |
| Wohlenberg Pictures Ltd | Information & communication | 2017 |
| Wolf-Be Ltd | Transport & logistics | 2023 |
| Wood Design & Management Limited | Administrative & support | 2010 |
| Woodfield Property Services Ltd | Professional & scientific | 2025 |
| Woodland Gardens Residents Limited | Real estate | 2020 |
| Woodpeckers Property Company Limited | Construction | 2014 |
| Woohoo Entertainment Limited | Professional & scientific | 2022 |
| Woolhouse Consulting Limited | Professional & scientific | 2003 |
| Worley Road 2013 Limited | Households | 2013 |
| Wotton Consulting Limited | Professional & scientific | 2008 |
| Wotton Cottages - the Lookout Limited | Real estate | 2020 |
| Wotton Cottages Limited | Real estate | 2019 |
| Wpdirectdebit Ltd | Information & communication | 2021 |
| Wrjd Solutions Ltd | Professional & scientific | 2025 |
| WW License Management Limited | Information & communication | 2022 |
| Wynne Construction Ltd | Construction | 2014 |
| Wynne Residential Ltd | Real estate | 2024 |
| X-Interventional Limited | Health & social care | 2015 |
| X89 Consulting Limited | Information & communication | 2018 |
| Xilogy Limited | Information & communication | 2022 |
| Xpay Limited | Professional & scientific | 2019 |
| XT Trade Limited | Information & communication | 2020 |
| Xtralifeincome Limited | Information & communication | 2016 |
| Yakaboo UK Ltd | Wholesale & retail | 2022 |
| Yellow Sky Business Delivery Partners Ltd | Professional & scientific | 2024 |
| Yogashop Ltd | Wholesale & retail | 2025 |
| Yolo IT Limited | Information & communication | 2014 |
| Yonca Moda (UK) Ltd | Wholesale & retail | 2019 |
| Yordanov Limited | Transport & logistics | 2009 |
| York House Residents Association Limited | Households | 1964 |
| Your Homehub Ltd | Real estate | 2025 |
| Zak-Kam Limited | Information & communication | 2025 |
| Zebedah Limited | Professional & scientific | 2020 |
| Zerizeri Ltd | Wholesale & retail | 2025 |
| Zero Five Properties Ltd | Real estate | 2021 |
| ZKM Building Consultants Ltd | Construction | 2017 |
| ZND Consulting Limited | Professional & scientific | 2013 |
| ZOE Claymore Garden Design Limited | Administrative & support | 2023 |
| ZOE Watson Consulting Ltd | Professional & scientific | 2024 |
| Zoom Strategies Limited | Professional & scientific | 2011 |
| Zooplin Ltd | Wholesale & retail | 2020 |
| Zorbozan Investment Ltd | Real estate | 2025 |
| Zuvsah Ltd | Health & social care | 2023 |
| Zymbos Ltd | Information & communication | 2025 |