| Westfield Close Limited | Real estate | 2021 |
| Westmill Garden Centre Ltd | Wholesale & retail | 2025 |
| Westmill Landscapes Ltd | Administrative & support | 2025 |
| Wheretowork Ltd | Administrative & support | 2020 |
| Whisk Bakehouse Limited | Manufacturing | 2025 |
| Whissendine Training Limited | Administrative & support | 2007 |
| Widbury Developments Limited | Real estate | 2011 |
| Widford Land Ltd | Administrative & support | 2016 |
| Wildstage Ltd | Real estate | 2022 |
| Wilkinson Passiv Homes Limited | Construction | 2020 |
| Willow Bright Enterprises Limited | Real estate | 2015 |
| Willowside Court Management Company Limited | Households | 2002 |
| Wills and Wilkin Limited | Agriculture & fishing | 1963 |
| Wilton Electrics (E & M) Limited | Extraterritorial | 2013 |
| Wilton Electrics Limited | Construction | 1991 |
| Winn Roofing & Leadwork Services Limited | Construction | 2025 |
| Wisbey Goodsell & Partners LLP | | 2013 |
| With Joyce Studio Limited | Professional & scientific | 2025 |
| Wizard Computech Limited | Information & communication | 2025 |
| WK Digital Ltd | Information & communication | 2025 |
| Wodson Park Trust | Arts & recreation | 2003 |
| Women's Construction Society | Other services | 2026 |
| Wood Lane (Newsome) Management Company Limited | Households | 2004 |
| Woodley Paving & Groundwork Limited | Construction | 2008 |
| Woodmoore Powder Coating Specialists Ltd | Manufacturing | 2019 |
| Woodward BI Consulting Ltd | Information & communication | 2017 |
| Woodward Heating Ltd | Construction | 2023 |
| Wordsmart Communications Limited | Administrative & support | 2016 |
| Work Placements UK Limited | Administrative & support | 2006 |
| Workzone Flexible Desk Space Ltd | Administrative & support | 2021 |
| World Pharma Group Ltd | Professional & scientific | 2022 |
| WOW Shine Ltd | Administrative & support | 2023 |
| Wrenn Lettings Ltd | Real estate | 2020 |
| Wrights Heating and GAS Services Ltd | Construction | 2022 |
| Wrightway Building Services Limited | Construction | 2023 |
| WS Homes Ltd | Real estate | 2025 |
| Wyld Thyme Eatery Ltd | Hospitality | 2020 |
| Wyrd Systrs Ltd | Wholesale & retail | 2024 |
| X Cleaning Services UK Ltd | Administrative & support | 2018 |
| Xentio Project Solutions Ltd | Information & communication | 2018 |
| Y3TEETOTAL Ltd | Arts & recreation | 2025 |
| YEK Zone Ltd | Professional & scientific | 2025 |
| Yellow Door Specialist Education CIC | Education | 2025 |
| Yellow Pixels Limited | Information & communication | 2015 |
| Yeoman Fire Safety Limited | Other services | 2023 |
| Your Title Here Limited | Administrative & support | 2019 |
| Z & F Ware Ltd | Hospitality | 2016 |
| ZEN Propertyco Ltd | Real estate | 2023 |
| Zest Learning & Development Limited | Professional & scientific | 2016 |
| Zing and Tonic Ltd | Health & social care | 2026 |
| Zing Events Limited | Professional & scientific | 2012 |
| ZOE Christina Andreas Ltd | Professional & scientific | 2016 |
| Zorbstrike Ltd | Arts & recreation | 2021 |
| Zukunft Consulting Ltd | Information & communication | 2019 |