| Website DNA Limited | Professional & scientific | 2007 |
| Wedgwood CRC Ltd | Wholesale & retail | 2006 |
| Welsh Canal Holiday Craft Limited | Transport & logistics | 2000 |
| Westwell Downs Events Limited | Hospitality | 2025 |
| Westwell Downs Shepherd Huts Limited | Hospitality | 2021 |
| Westwell Farms (Holdings) Limited | Real estate | 1958 |
| Westwell Farms Limited | Agriculture & fishing | 1973 |
| WH Projects Limited | Manufacturing | 2008 |
| What NOW Ltd | Households | 2017 |
| Wheatley Tyre Centre Oxford Ltd | Wholesale & retail | 2020 |
| White Horse Event Management Limited | Administrative & support | 2007 |
| White Lion Residential Limited | Real estate | 2013 |
| Whiting Builders Limited | Construction | 2017 |
| Whitler Construction Limited | Real estate | 1981 |
| Whizzkidz (Thame) Limited | Real estate | 2005 |
| Wilber Homes (Barns) Limited | Construction | 2021 |
| Wilber Homes Limited | Construction | 2016 |
| Wilby Advisory Limited | Professional & scientific | 2019 |
| Wild Glass Ltd | Wholesale & retail | 2021 |
| Wild Lake Holding Limited | Financial services | 2025 |
| Wild Lemongrass Ltd | Hospitality | 2024 |
| Wild Pear CIC | Professional & scientific | 2020 |
| Wild Venison and Game Limited | Manufacturing | 2022 |
| Wildwyn Ltd | Wholesale & retail | 2025 |
| Will Gallegos Ltd | Arts & recreation | 2011 |
| Will Shaw Chef Limited | Hospitality | 2020 |
| Williams Garden Care Limited | Administrative & support | 2015 |
| Willowtree Marine Limited | Arts & recreation | 1988 |
| Wills & Trusts Accounting Limited | Professional & scientific | 2019 |
| Wills & Trusts Independent Estate Planning Limited | Financial services | 2004 |
| Wills & Trusts Independent Financial Planning Limited | Financial services | 1998 |
| Wills & Trusts Legal Limited | Professional & scientific | 2019 |
| Wills & Trusts Wealth Management Limited | Professional & scientific | 2013 |
| Windles Group Manufacturing Limited | Manufacturing | 2010 |
| Windles Manufacturing Solutions Limited | Manufacturing | 2020 |
| Wingate Point Limited | Administrative & support | 2021 |
| Winterbrook Ltd | Professional & scientific | 2014 |
| Wirth Doors Limited | Professional & scientific | 2018 |
| Wirth Research Limited | Professional & scientific | 1995 |
| Wits END Farm (Waterperry) Limited | Agriculture & fishing | 2021 |
| WOJ Limited | Information & communication | 2019 |
| WOM Trading Ltd | Wholesale & retail | 2025 |
| Wood-Construction Ltd | Construction | 2007 |
| Woodbridge Investments Limited | Construction | 2016 |
| Word of Mouth NB Limited | Health & social care | 2021 |
| WORK4SURE Limited | Information & communication | 2013 |
| WORK4SURE.COM Limited | Information & communication | 1999 |
| Wrenspire Projects Ltd | Construction | 2004 |
| Write by Your Side Limited | Professional & scientific | 2009 |
| WYE Valley Homes Ltd. | Real estate | 1988 |
| Wynn Farming Limited | Agriculture & fishing | 2017 |
| Xago Africa Limited | Construction | 2002 |
| Xcalibre Fulfilment Solutions Limited | Information & communication | 2006 |
| Xcalibre Generation Limited | Financial services | 2017 |
| XYZ Group Ltd | Extraterritorial | 2016 |
| XYZ Music Academy Ltd | Other services | 2014 |
| Yellow Beard Limited | Professional & scientific | 2019 |
| Yellow Beetle Ltd | Information & communication | 2024 |
| Yellowfin Marketing Limited | Professional & scientific | 2018 |
| Yogi Breisner Limited | Arts & recreation | 2010 |
| Yonet Telecom Ltd | Information & communication | 2016 |
| Yonghongming Limited | Hospitality | 2023 |
| Your Surveying Partner Limited | Other services | 2025 |
| Youth Athlete Academy Ltd | Education | 2026 |
| YW P&E Ltd | Education | 2022 |
| ZCD Architects Ltd | Construction | 2013 |
| ZEN Hair Ltd | Other services | 2011 |
| Zilva Coffee Co Ltd | Wholesale & retail | 2026 |
| Zingay Limited | Real estate | 2003 |
| ZYA Enzymes Ltd | Professional & scientific | 2018 |