| W.M.M. Technical Services Limited | Administrative & support | 2016 |
| Wades Group Limited | Wholesale & retail | 2017 |
| Wags and Wash Ltd | Other services | 2025 |
| Waistaway Limited | Health & social care | 2004 |
| Waldburg Shires Ltd | Other services | 2024 |
| Waldon Associates Limited | Administrative & support | 2002 |
| Walker Lumley Limited | Administrative & support | 2016 |
| Wall of Bass Ltd | Arts & recreation | 2024 |
| Wall Street Property Ltd | Real estate | 2019 |
| Walls Adapt Ltd | Information & communication | 2017 |
| Walshvalidationgroup Ltd | Professional & scientific | 2026 |
| Wamo Sports Limited | Arts & recreation | 2016 |
| Warboys Industrial Estate Management Company Limited | Real estate | 2014 |
| Warboys Mill Enterprise Limited | Manufacturing | 2017 |
| Warboys Sports & Social Club Ltd | Hospitality | 2025 |
| Ward Anthony Limited | Professional & scientific | 2021 |
| Warner's World Ltd | Professional & scientific | 2018 |
| Warren Court (ST. Ives) Management Company Limited | Households | 1976 |
| Warthog Connect C.I.C. | Health & social care | 2025 |
| Waspbane Limited | Extraterritorial | 2009 |
| Water Meadows Consulting Limited | Professional & scientific | 2020 |
| Waterhouse Curran Limited | Wholesale & retail | 2026 |
| Watermeade Ltd | Information & communication | 2008 |
| Waters Mechanical Services Ltd | Manufacturing | 2005 |
| Waterside Antiques Limited | Wholesale & retail | 2005 |
| Watson Grange Limited | Extraterritorial | 1998 |
| Watson Wise Services Limited | Wholesale & retail | 1993 |
| Wave Airport Transfer Ltd | Transport & logistics | 2022 |
| Wave Water Limited | Professional & scientific | 1992 |
| Wavelength Productions Limited | Information & communication | 2014 |
| Wayfarer Nurseries Ltd | Health & social care | 2021 |
| Wayfarer Property Ltd | Real estate | 2020 |
| Wbit Property Limited | Real estate | 2023 |
| WE Care Health Care Ltd | Health & social care | 2019 |
| WE Protect Group Limited | Professional & scientific | 2018 |
| WE Support IT Consultants Limited | Information & communication | 2012 |
| WEB2MARKET Limited | Information & communication | 2000 |
| Webbtech Ltd | Information & communication | 2020 |
| Webster Electrical Ltd | Construction | 2023 |
| Wedding Gift Registry Limited | Wholesale & retail | 2000 |
| Wedding Workshop Ltd | Wholesale & retail | 2014 |
| Wedran Limited | Professional & scientific | 2011 |
| Welch Carpentry Limited | Manufacturing | 2013 |
| Welcome ME Home Rentals Ltd | Real estate | 2023 |
| Weldon Farms Limited | Professional & scientific | 2004 |
| Well at Work Project Ltd | Health & social care | 2025 |
| Wellness for the World Ltd | Other services | 2023 |
| Wellsocia Ltd | Extraterritorial | 2025 |
| Weltech International Limited | Manufacturing | 1997 |
| Wensleydale Consultancy Ltd | Health & social care | 2022 |
| Wensleydale Dental Practice Limited | Health & social care | 2011 |
| West Farm Group Ltd | Agriculture & fishing | 2025 |
| West Norfolk Solar Energy Limited | Energy | 2021 |
| Westbrook Place Limited | Households | 2021 |
| Westergreen Consultancy Limited | Professional & scientific | 2025 |
| Westgarth Music School and Studios Limited | Information & communication | 2020 |
| Westj Properties Ltd | Construction | 2024 |
| Weston PUB Company Ltd | Hospitality | 2020 |
| Wethu Ltd | Information & communication | 2023 |
| WG Kitchen Ltd | Hospitality | 2024 |
| WGG Holdings Limited | Financial services | 2024 |
| WGM Investments Limited | Administrative & support | 2022 |
| Wharfedale International Limited | Manufacturing | 1982 |
| What WHY WHO Ltd | Extraterritorial | 2021 |
| Wheatsheaf Brewery Ltd | Manufacturing | 2022 |
| Whiskers and Paws Petcare Ltd | Agriculture & fishing | 2024 |
| White Brocklebank Associates Ltd | Professional & scientific | 2013 |
| White Oaks Construction Ltd | Construction | 2019 |
| White Space Solutions Ltd | Professional & scientific | 2024 |
| White Wolfs Security Ltd | Administrative & support | 2025 |
| Whitehall School Limited | Education | 2002 |
| Whitehills Recycling Ltd | Water & waste | 2013 |
| WI TH Solutions Ltd. | Professional & scientific | 2011 |
| Wigwam Nurseries Limited | Education | 2003 |
| Wilbec Projects Limited | Construction | 2015 |
| Wilderspin Garage Ltd | Wholesale & retail | 2011 |
| Wildfrost Cafe (Ramsey) Limited | Hospitality | 2019 |
| Wildkat Media Limited | Information & communication | 2025 |
| Wildwood Grove Limited | Professional & scientific | 2026 |
| Wildwood Special Projects Limited | Real estate | 2013 |
| WILK1TRANS Ltd | Transport & logistics | 2022 |
| Willett International Limited | Professional & scientific | 1983 |
| Willex Property Limited | Real estate | 2025 |
| William H. Hutson & SON Limited | Hospitality | 1965 |
| Williams Accountancy Services Limited | Professional & scientific | 2002 |
| Williams Agri Limited | Agriculture & fishing | 2018 |
| Williams Bros Transport Limited | Transport & logistics | 2001 |
| Williams Tree Surgery Ltd | Agriculture & fishing | 2017 |
| Willis Haulage Limited | Transport & logistics | 2011 |
| Wilson Estates Limited | Construction | 2026 |
| Wind Chymes Ltd | Information & communication | 2025 |
| Window Cleaner Plus Ltd | Administrative & support | 2025 |
| Window Solutions (UK) Limited | Construction | 2003 |
| Windrush Asset Management Limited | Real estate | 2010 |
| Wine in the Willows Ltd | Hospitality | 2024 |
| Wings Studios Ltd. | Arts & recreation | 2019 |
| Wings Taking Flight Ltd | Professional & scientific | 2022 |
| Wings Taking Flight SR22G3 Limited | Professional & scientific | 2023 |
| Wingscroc Ltd | Professional & scientific | 2024 |
| Wink Lash Bar Ltd | Other services | 2017 |