| Weston Green Consulting Limited | Professional & scientific | 2012 |
| Weston Property Investments Ltd | Real estate | 2012 |
| White Glove Surrey Ltd | Transport & logistics | 2017 |
| Whitegate Place Residents Management Company Limited | Households | 2011 |
| Whitestone Financials Limited | Professional & scientific | 2025 |
| Wicklow Developments Ltd | Construction | 2019 |
| Wickwood Hill Residents Management Company Limited | Households | 2020 |
| Wildman Residential Ltd | Real estate | 2025 |
| Wilkinson Transformation Limited | Professional & scientific | 2024 |
| Will Robinson Consulting Limited | Administrative & support | 2023 |
| Williams Consulting (Malton) Limited | Information & communication | 2024 |
| Williams Restoration Limited | Construction | 2015 |
| Willis Welby LLP | | 2009 |
| Wingman Enterprises Ltd | Professional & scientific | 2025 |
| Winterdown Interiors Ltd | Professional & scientific | 2019 |
| Wise Red Asset Management Limited | Real estate | 2024 |
| Wisley Capital Limited | Financial services | 2020 |
| Wizzit Holdings Ltd | Information & communication | 2019 |
| Wolfed OUT Ltd | Construction | 2020 |
| Wonder Results Ltd | Wholesale & retail | 2015 |
| Woodham Van & Car Sales Limited | Wholesale & retail | 2010 |
| Woodlock Consulting Limited | Information & communication | 2024 |
| Wordbank Limited | Information & communication | 1988 |
| Wordbank Marketing Ltd | Information & communication | 2013 |
| Workbench Hire UK Limited | Administrative & support | 2025 |
| World Mission Korean Presbyterian Church | Education | 1992 |
| Wrist Art Ltd | Wholesale & retail | 2018 |
| WT Probate Ltd | Professional & scientific | 2025 |
| WXE Limited | Manufacturing | 2015 |
| Wyatt Carruthers Jebb Limited | Construction | 1990 |
| Xander Properties Investments Ltd | Real estate | 2021 |
| Xceed Consulting Solutions Limited | Information & communication | 2008 |
| Xenor UK Ltd | Transport & logistics | 2021 |
| XPD Capital Limited | Professional & scientific | 2016 |
| Xpress Mortgages Limited | Financial services | 2006 |
| Yan&Co Club Ltd | Arts & recreation | 2025 |
| Yando Project Finance Services Ltd | Education | 2025 |
| Yang Properties Limited | Real estate | 2012 |
| Yeats Development Ltd | Construction | 2021 |
| YES Estates Ltd | Real estate | 2012 |
| YFT Solutions Ltd | Information & communication | 2025 |
| Yobital Limited | Professional & scientific | 2023 |
| Yoga B.C. Limited | Health & social care | 1997 |
| You'Ve Been Collared Ltd | Manufacturing | 2021 |
| Yulia Yoga Limited | Other services | 2025 |
| Zahir Star Limited | Professional & scientific | 2007 |
| Zakat Investments Limited | Professional & scientific | 2020 |
| Zhaan Services Ltd | Professional & scientific | 2008 |
| Zima L'Immobilier Limited | Wholesale & retail | 2024 |