| Warwick Steel Structures Limited | Manufacturing | 2002 |
| Washburn Management Consultancy Limited | Professional & scientific | 2019 |
| Washington Care Services Limited | Administrative & support | 2024 |
| Wasp Management Software Limited | Information & communication | 2011 |
| WASTE2SOIL Ltd | Other services | 2023 |
| Wastesolve Limited | Water & waste | 2023 |
| Wastetech Environmental Solutions Limited | Professional & scientific | 2020 |
| Watch Pilot Retail Ltd | Wholesale & retail | 2021 |
| Watcho Ltd | Wholesale & retail | 2012 |
| Watcho MK Ltd | Wholesale & retail | 2017 |
| Water Advantage Ltd | Wholesale & retail | 2025 |
| Water Consultancy Services Limited | Professional & scientific | 2016 |
| Water Eaton Management Company Limited | Administrative & support | 2007 |
| Water END Homes Limited | Real estate | 2015 |
| Water END Properties (Ampthill) Limited | Construction | 1998 |
| Water END Properties Limited | Construction | 1998 |
| Water Lily & Co | Education | 2014 |
| Watercress Properties Limited | Construction | 2022 |
| Waterfall Labs Ltd | Information & communication | 2022 |
| Waterlily Consultancy Ltd | Administrative & support | 2021 |
| Watermark Holdings Limited | Wholesale & retail | 2010 |
| Watermark Limited | Wholesale & retail | 1980 |
| Watermill Group Limited | Construction | 2020 |
| Watermill Properties Limited | Real estate | 2023 |
| Waters View Ltd | Professional & scientific | 2015 |
| Waterside (Broughton) Management Company Limited | Households | 2008 |
| Waterside Peartree Ltd | Real estate | 2020 |
| Waterspout Ltd | Real estate | 2021 |
| Waterways Cars Limited | Wholesale & retail | 2025 |
| Waterways Prestige Limited | Wholesale & retail | 2020 |
| Watford Business Services Ltd | Real estate | 2011 |
| Watling Media Ltd | Information & communication | 2024 |
| Wats Transport Ltd | Transport & logistics | 2014 |
| Watson & Stearn Holdings Limited | Professional & scientific | 2005 |
| Watson Helsby Limited | Administrative & support | 1999 |
| Watson Plumbing and Property Services Ltd | Administrative & support | 2015 |
| Watson Works Limited | Professional & scientific | 2017 |
| Watt & Connolly Contracts Limited | Construction | 2011 |
| Watts Wood NO.1 Residents Company Limited | Households | 1990 |
| Wave 2.0 Limited | Education | 2024 |
| Wave Publicity Limited | Professional & scientific | 2017 |
| Wavelength Professional Recruitment Limited | Administrative & support | 2001 |
| Wavendon 18 Hole Company Limited | Real estate | 2023 |
| Wavendon ALL Music Plan | Arts & recreation | 1970 |
| Wavendon House Management Company Limited | Households | 1985 |
| Wavendon Interiors & Construction Ltd | Construction | 2026 |
| Wavendon Precision Machining Ltd | Manufacturing | 2012 |
| Waverider Services Ltd | Construction | 2019 |
| Waverley Solutions Limited | Administrative & support | 2011 |
| Waves Property Ltd | Real estate | 2021 |
| Waveyboyz Worldwide Ltd | Wholesale & retail | 2021 |
| Waving Ltd | Information & communication | 2022 |
| Wavry Technologies Limited | Information & communication | 2025 |
| WAW Lifestyle Limited | Information & communication | 2018 |
| Way 10 Limited | Professional & scientific | 2008 |
| Wayhey Ltd | Professional & scientific | 2024 |
| Wayland Aero Limited | Manufacturing | 2025 |
| Waymaker & Mint Limited | Information & communication | 2018 |
| Waymakercourier Ltd | Transport & logistics | 2024 |
| Wayne Hale Roofing Ltd | Construction | 2025 |
| Wayshire Holdings Ltd | Financial services | 2022 |
| Wazinated Limited | Public administration | 2022 |
| WB (Bucks) Management Limited | Professional & scientific | 2024 |
| WB Facilities Management Limited | Energy | 2025 |
| WB London South West Limited | Arts & recreation | 2010 |
| WBD Consult Limited | Professional & scientific | 2025 |
| WBN Media Limited | Professional & scientific | 2021 |
| WC Corporation Ltd | Health & social care | 2023 |
| WCK Care Ltd | Health & social care | 2013 |
| WD-40 Company Limited | Manufacturing | 1983 |
| WD-40 Holdings Limited | Professional & scientific | 2004 |
| WE ARE Arena Limited | Hospitality | 2025 |
| WE ARE Creative (MK) Ltd | Information & communication | 2018 |
| WE ARE Freight Limited | Transport & logistics | 2020 |
| WE ARE Generator Limited | Administrative & support | 2006 |
| WE ARE Ghost Kitchens Limited | Manufacturing | 2025 |
| WE ARE Gigantic Ltd | Professional & scientific | 2026 |
| WE ARE Halo Catering Limited | Hospitality | 2024 |
| WE ARE Halo Hire Limited | Administrative & support | 2025 |
| WE ARE Halo Limited | Hospitality | 2023 |
| WE ARE Halo Staffing Ltd | Administrative & support | 2026 |
| WE ARE Halo Ventures Limited | Financial services | 2024 |
| WE ARE Lunarium Ltd | Wholesale & retail | 2022 |
| WE ARE Many Hands Ltd | Wholesale & retail | 2018 |
| WE ARE Marble Ltd | Professional & scientific | 2019 |
| WE ARE Merchandise Limited | Wholesale & retail | 2023 |
| WE ARE Morella Ltd | Information & communication | 2025 |
| WE ARE Nova Group Limited | Hospitality | 2026 |
| WE ARE Sunny Ltd | Information & communication | 2021 |
| WE ARE the Iroko C.I.C. | Administrative & support | 2023 |
| WE Care Healthcare Services Ltd | Health & social care | 2026 |
| WE Care MK Ltd | Administrative & support | 2022 |
| WE Care Physio Ltd | Other services | 2017 |
| WE Guard Limited | Administrative & support | 2019 |
| WE Love Homes Ltd | Real estate | 2021 |
| WE Manage Freight Limited | Transport & logistics | 2024 |
| WE Property 2020 Ltd | Real estate | 2025 |
| WE Raise ANY Finance Limited | Administrative & support | 2017 |
| WE Sell Doors Ltd | Manufacturing | 2018 |
| WE Sell Villas Ltd | Hospitality | 2021 |