| Williams Marine and Watersports Limited | Manufacturing | 2017 |
| Williams Network Solutions Ltd | Information & communication | 2017 |
| Williams Trade Supplies Holdings Limited | Financial services | 2015 |
| Williams Trade Supplies Limited | Wholesale & retail | 1984 |
| Willow Tree Lodge Limited | Health & social care | 2010 |
| Willowhayne Records Ltd. | Information & communication | 2010 |
| Wills Bars and Events Ltd | Hospitality | 2021 |
| Wilmslow Specsavers Limited | Wholesale & retail | 2012 |
| Wilson Aero Solutions Ltd | Manufacturing | 2021 |
| Wilson Capital Holdings Ltd | Financial services | 2025 |
| Wilson Scott Ltd | Manufacturing | 2021 |
| Wilsonhalligan Limited | Administrative & support | 2007 |
| Wilstech Mechanical Services Ltd | Professional & scientific | 2026 |
| Wilver Engineering Ltd | Manufacturing | 1995 |
| Wilzo Properties Limited | Households | 2022 |
| Wimbledon Broadway Specsavers Hearcare Limited | Wholesale & retail | 2018 |
| Wimborne Minster Specsavers Limited | Wholesale & retail | 2022 |
| Winchester Chamber of Commerce & Industry | Other services | 1918 |
| Winchester Specsavers Limited | Wholesale & retail | 2001 |
| Winchmore Hill Specsavers Limited | Wholesale & retail | 2018 |
| Wind Tech Limited | Real estate | 1986 |
| Windell Farming Ltd | Agriculture & fishing | 2021 |
| Windmill Eco Cleaning Services Ltd | Administrative & support | 2025 |
| Windsor Interiors Ltd | Other services | 2017 |
| Windust Holdings Limited | Financial services | 2018 |
| Wine & Words by Watson Ltd | Hospitality | 2025 |
| Wings and Waves Ltd | Administrative & support | 2009 |
| Winkworth Electrical Limited | Construction | 2003 |
| Winns Asset Finance Limited | Financial services | 2003 |
| Winscombe Care Home Limited | Health & social care | 2011 |
| Winsford Specsavers Hearcare Limited | Wholesale & retail | 2018 |
| Winsford Specsavers Limited | Wholesale & retail | 2004 |
| Winsford Visionplus Limited | Wholesale & retail | 2004 |
| Winslow Court Management Company Limited | Households | 1985 |
| Winsor Construction Limited | Construction | 2011 |
| Winsystem IT Service Company Ltd | Information & communication | 2023 |
| Winterbourne Arms 2022 Limited | Hospitality | 2022 |
| Winterstoke Road Specsavers Limited | Wholesale & retail | 2018 |
| Winton Specsavers Limited | Wholesale & retail | 2015 |
| Wintrust Healthcare Limited | Administrative & support | 2022 |
| Wintrust Services Limited | Health & social care | 2016 |
| Winzar & SON Limited | Construction | 2013 |
| Winzar Electrical and Building Services Limited | Construction | 2010 |
| Winzar Holdings Limited | Real estate | 2016 |
| Winzar Property Services Limited | Real estate | 2018 |
| Wirefield Holdings Limited | Financial services | 2021 |
| Wirefield Limited | Manufacturing | 1991 |
| Wisbech Specsavers Hearcare Limited | Wholesale & retail | 2013 |
| Wisbech Specsavers Limited | Wholesale & retail | 2003 |
| Wisdom on Line Networks Limited | Information & communication | 1991 |
| Wise Consulting Limited | Information & communication | 2024 |
| Wise Design Ltd | Administrative & support | 2000 |
| Wise Immigration Ltd | Information & communication | 2025 |
| Wise MEN Pubs Limited | Hospitality | 2021 |
| Wishaw Specsavers Limited | Wholesale & retail | 2007 |
| Wishaw Visionplus Limited | Wholesale & retail | 2007 |
| Wispers Limited | Other services | 2002 |
| Witham Specsavers Hearcare Limited | Wholesale & retail | 2023 |
| Witham Specsavers Limited | Wholesale & retail | 2003 |
| Withbits Limited | Arts & recreation | 2005 |
| Witney Specsavers Hearcare Limited | Wholesale & retail | 2025 |
| Witney Specsavers Limited | Wholesale & retail | 1994 |
| Witney Visionplus Limited | Wholesale & retail | 1994 |
| Wizard Commercial Analytics Limited | Professional & scientific | 2014 |
| WJ Electrical Limited | Construction | 2015 |
| WJ Installation Limited | Construction | 2025 |
| WJR Accountancy Ltd | Professional & scientific | 2025 |
| WL Diagnostics Limited | Health & social care | 2017 |
| Wmedits Limited | Information & communication | 2025 |
| WMM Ltd | Professional & scientific | 2023 |
| WND Properties Ltd | Real estate | 2019 |
| Woburn Sands Computing Ltd | Information & communication | 2013 |
| WOK N Roll Cafe Limited | Hospitality | 2011 |
| WOK N Roll Limited | Hospitality | 2011 |
| Woking Specsavers Hearcare Limited | Wholesale & retail | 2017 |
| Wokingham Specsavers Hearcare Limited | Wholesale & retail | 2026 |
| Wokingham Specsavers Limited | Wholesale & retail | 2000 |
| Wolfpack Recruitment Limited | Administrative & support | 2017 |
| Wolstenholme Contractors Limited | Construction | 2014 |
| Wolverhampton Specsavers Hearcare Limited | Wholesale & retail | 1999 |
| Wolverhampton Visionplus Limited | Wholesale & retail | 1991 |
| Wombshine Ltd | Manufacturing | 2024 |
| Wombwell Specsavers Limited | Wholesale & retail | 2018 |
| Wongfulau Limited | Hospitality | 2025 |
| Wood Green Specsavers Hearcare Limited | Wholesale & retail | 2006 |
| Wood Green Specsavers Limited | Wholesale & retail | 1995 |
| Wood Green Visionplus Limited | Wholesale & retail | 1995 |
| Woodbank (Home Improvements) Limited | Construction | 1981 |
| Woodbridge Specsavers Hearcare Limited | Wholesale & retail | 2023 |
| Woodbridge Specsavers Limited | Wholesale & retail | 2010 |
| Woodbyne Fitness Clinic Limited | Arts & recreation | 2002 |
| Woodentots Nursery Ltd | Other services | 2017 |
| Woodley Visionplus Limited | Wholesale & retail | 2002 |
| Woodpecker Developments Limited | Construction | 2004 |
| Woodside Holding Ltd | Real estate | 2004 |
| Woodside Park Homes Limited | Construction | 2019 |
| Woodspoon Property Ltd | Real estate | 2026 |
| Woodstone Construction (Southern) Limited | Construction | 2016 |
| Woodward Tree Surgeons Ltd | Administrative & support | 2022 |
| Woodworx CNC Ltd | Professional & scientific | 2019 |