| Walsh Civil Engineering Services Ltd | Construction | 2023 |
| Walsh Construction Services Ltd | Construction | 2019 |
| Walters Snowdon Advertising Ltd | Professional & scientific | 2005 |
| Waltham Cross 2 Renewables Ltd | Professional & scientific | 2023 |
| Waltham Cross 7 Renewables Ltd | Professional & scientific | 2023 |
| Waltmoore Investments Limited | Real estate | 2017 |
| Waltons Estates Holdings Ltd | Financial services | 2023 |
| Walton’S Estates Ltd | Real estate | 2020 |
| Wamitab Limited | Education | 2018 |
| WAN Plastering Limited | Construction | 2015 |
| Wanatai Wellness Limited | Health & social care | 2016 |
| Wandaprep Academy Ltd | Information & communication | 2026 |
| Wangshi Property Group Limited | Real estate | 2023 |
| Wannoo Group Ltd | Administrative & support | 2023 |
| Wanstead Nursery Limited | Education | 2009 |
| Wanyana Care Ltd | Health & social care | 2013 |
| Waqarhub Ltd | Wholesale & retail | 2024 |
| WAR and Peace Revival Limited | Administrative & support | 2015 |
| Warburton Estate Company Limited | Real estate | 1993 |
| Ward Flooring Solutions Limited | Construction | 2011 |
| Ward Workwear Services Limited | Other services | 2012 |
| Wardens Lodge (Daventry) Management Company Limited | Real estate | 1988 |
| Wardle and Keach International Limited | Transport & logistics | 1925 |
| Wards of Olney Ltd | Transport & logistics | 2024 |
| Wards Storage Ltd | Transport & logistics | 2011 |
| Warehouse Lines and Signs Limited | Administrative & support | 2012 |
| Warehouse Netting Limited | Extraterritorial | 2014 |
| Warehousing Made Easy Limited | Transport & logistics | 2016 |
| Warid Limited | Health & social care | 2023 |
| Warisara Thai Kitchen Ltd | Hospitality | 2014 |
| Warm Easy Limited | Wholesale & retail | 2026 |
| Warner Knight Associates Limited | Administrative & support | 2012 |
| Warner Recruitment Limited | Administrative & support | 2020 |
| Warnes Consulting Limited | Administrative & support | 2007 |
| Warre Constable LLP | | 2023 |
| Warren Clayson Electrical Limited | Construction | 2015 |
| Warren Close Properties Unlimited | Real estate | 2019 |
| Warren's Handyman and Vehicle Services Limited | Wholesale & retail | 2022 |
| Warrington Installations Limited | Construction | 2021 |
| Warwick Burt Construction Limited | Construction | 1993 |
| Warwick House (Northampton) Limited | Households | 1982 |
| Warwick House of Beauty Limited | Extraterritorial | 2017 |
| Warwick Road (ECS) Limited | Real estate | 2020 |
| Wasaat (Women, a Step at a Time) Community Interest Company | Education | 2026 |
| WASH4DAYS Solutions Limited | Administrative & support | 2025 |
| Washbrook Lodge Ltd | Hospitality | 2023 |
| Washhub Group Ltd | Administrative & support | 2025 |
| Washhub Northampton Ltd | Administrative & support | 2026 |
| Wasif Law Ltd | Professional & scientific | 2024 |
| Waste Smart Limited | Professional & scientific | 2012 |
| Waste to OIL | Water & waste | 2006 |
| Waste Wise Kids Limited | Education | 2019 |
| Wasted Corporation Limited | Information & communication | 2026 |
| Waszi Trans Ltd | Transport & logistics | 2016 |
| Watchdawg Couriers Ltd | Transport & logistics | 2026 |
| Watchmen Media Limited | Information & communication | 2005 |
| Water Engineering Limited | Manufacturing | 2004 |
| Water Feature Shop Limited | Wholesale & retail | 2022 |
| Water Therapy UK Ltd | Wholesale & retail | 2021 |
| Water Wizards Swim School Limited | Education | 2011 |
| Waterfalls Re-Juvenation Services Ltd | Other services | 2021 |
| Waterhall Ltd | Information & communication | 2021 |
| Watermark Plumbing and Refurbishments Limited | Manufacturing | 2007 |
| Waternook Limited | Real estate | 2007 |
| Waters Edge Ltd | Real estate | 2022 |
| Watersheds Limited | Administrative & support | 2012 |
| Watersheds Partners Limited | Professional & scientific | 2020 |
| Waterside 21 Management Harpenden Limited | Households | 2015 |
| Waterside Angling Supplies Limited | Wholesale & retail | 2013 |
| Waterside Campus Development Company PLC | Professional & scientific | 2014 |
| Waterside Management Company (Atherstone) Limited | Households | 2002 |
| Waterside Optics Ltd | Wholesale & retail | 2019 |
| Watersmeet Project Solutions Limited | Information & communication | 2009 |
| Waterways Publishing Ltd | Manufacturing | 2023 |
| Waterwolf Ltd | Professional & scientific | 2024 |
| Watford Elad Concept Limited | Professional & scientific | 2025 |
| Watford Village Management Company Limited | Households | 2004 |
| Watkin and Lawrence Electrical Ltd | Construction | 2013 |
| Watkins Terrace Management Company Limited | Households | 1988 |
| Watson Property Lettings Limited | Real estate | 2021 |
| Watson Prototype Design Limited | Professional & scientific | 2007 |
| Watten Power Limited | Manufacturing | 2026 |
| Watts Plumbing and Heating Limited | Construction | 2011 |
| Waudog Limited | Wholesale & retail | 2019 |
| Wave Spark Ltd | Professional & scientific | 2024 |
| Wavendon Properties Holdings Limited | Financial services | 2022 |
| Wavendon Properties Limited | Construction | 2005 |
| Wavermace Developments Limited | Administrative & support | 1987 |
| Wavesment Limited | Other services | 2024 |
| WAX Candles UK Ltd | Manufacturing | 2026 |
| Wayman Architects Ltd | Professional & scientific | 2021 |
| Waymark Technology Limited | Professional & scientific | 2009 |
| Waymount Limited | Real estate | 1995 |
| Wayne O'Connor Property Sourcing Ltd | Real estate | 2024 |
| Waystar Royco Ltd | Real estate | 2025 |
| Wazeer Ltd | Wholesale & retail | 2016 |
| Wazhma Malik Limited | Hospitality | 2019 |
| WBD (Chalfont Park) Limited | Real estate | 2000 |
| Wbhb Ltd | Real estate | 2014 |
| WCC Management UK Limited | Arts & recreation | 2023 |