| Weddings by Terry Lewis Limited | Other services | 2014 |
| Weedcutter Limited | Administrative & support | 2018 |
| Weedcutter Services LLP | | 2018 |
| Wefix Plumbing & Heating Ltd | Construction | 2019 |
| Weir and Hodgkinson Limited | Real estate | 2012 |
| Welcome Home Property Limited | Construction | 2019 |
| Welcoming Success Limited | Other services | 2015 |
| Weldatube Group Limited | Financial services | 2022 |
| Weldatube Mechanical & Electrical Services Limited | Construction | 1997 |
| Well Kept Services Limited | Other services | 2015 |
| Wellcom Fire and Security Ltd | Administrative & support | 2016 |
| Wellmax Scaffold Ltd | Extraterritorial | 2008 |
| Wells Street Limited | Hospitality | 2005 |
| Wells Wharf Ltd | Administrative & support | 2026 |
| Welsim Limited | Manufacturing | 2010 |
| Welsted Joinery Holdings Limited | Construction | 2016 |
| Welsted Joinery Limited | Construction | 1979 |
| Wenbar Limited | Manufacturing | 2006 |
| Wenbar Print Limited | Manufacturing | 2013 |
| Wenway Solutions Ltd | Real estate | 2013 |
| Werks Ltd | Real estate | 2026 |
| Wertex Walls Ltd | Construction | 2025 |
| WES Futures Holdings Limited | Construction | 2013 |
| WES Futures Limited | Construction | 2004 |
| West Architecture Limited | Administrative & support | 2006 |
| West Grand Consulting Limited | Information & communication | 2010 |
| West Highland Solutions Ltd | Wholesale & retail | 2018 |
| West London Leaflets Limited | Professional & scientific | 2026 |
| West Marina ST Leonards Limited | Real estate | 2020 |
| Westall Vision & Optics Ltd | Professional & scientific | 2025 |
| Westbury Conservatories Limited | Extraterritorial | 2011 |
| Westbury Garden Rooms Limited | Construction | 1988 |
| Westbury Professional Services Limited | Professional & scientific | 2013 |
| Westbury Trust Limited | Financial services | 2024 |
| Westbury Windows & Joinery Limited | Manufacturing | 1992 |
| Westech Scientific Instruments Limited | Manufacturing | 2012 |
| Westgroup Investments Limited | Real estate | 1998 |
| Westgrove Painting & Decorating Ltd | Construction | 2016 |
| Westhey Holdings One Limited | Financial services | 2024 |
| Westhey Limited | Professional & scientific | 2014 |
| Westlake Services Ltd | Construction | 2019 |
| Westrend Properties and Maintenance Limited | Real estate | 2020 |
| Westside Trading and Storage Limited | Extraterritorial | 2015 |
| Westwood Film Facilities Limited | Administrative & support | 2001 |
| Westwood Films Limited | Administrative & support | 2006 |
| Westwood Group Holdings Limited | Financial services | 2006 |
| Westwood Holdings One Limited | Financial services | 2024 |
| Westwood Places Ltd | Real estate | 2022 |
| Wetware Ltd | Information & communication | 2021 |
| WFT26 Limited | Professional & scientific | 2026 |
| WGF Services Limited | Administrative & support | 2007 |
| WH 2021 Ltd | Administrative & support | 2021 |
| Wharf Advisory Services Limited | Professional & scientific | 2018 |
| Wharf Farm Kent Limited | Households | 2022 |
| Wharf Professional Consultancy Ltd | Professional & scientific | 2019 |
| Wharfside Property Management Ltd | Real estate | 2018 |
| What the Buck Ltd | Information & communication | 2022 |
| Whatbeer Ltd | Extraterritorial | 2025 |
| Whats-On-Guide Limited | Extraterritorial | 1998 |
| Whats-On-Uk.Co.Uk Limited | Extraterritorial | 1998 |
| Wheeler Property Developments Limited | Construction | 2018 |
| Whelan & Smith Limited | Real estate | 2025 |
| Wherry Road Residents Company Ltd | Real estate | 2016 |
| WHI Limited | Administrative & support | 2023 |
| Whisper Court Management Company Limited | Real estate | 1975 |
| Whisper Works Limited | Administrative & support | 2025 |
| Whit Prop (UK) Limited | Real estate | 2017 |
| Whitcombe Services Ltd | Information & communication | 2023 |
| White Air Conditioning Limited | Energy | 2025 |
| White and Bagnall Building Contractors Limited | Construction | 2013 |
| White and White London Contracts Limited | Construction | 2013 |
| White Brick Renovation Company Ltd. | Real estate | 2013 |
| White Dome Property Limited | Real estate | 2019 |
| White Fire Technologies Ltd | Education | 2025 |
| White Hart Lane Clinic Ltd | Health & social care | 2007 |
| White House Farm | | 1990 |
| White House Service Station Ltd | Wholesale & retail | 2021 |
| White Oak Autos Limited | Wholesale & retail | 2011 |
| White Prizm Ltd | Wholesale & retail | 2023 |
| Whiteaker Creative Media Limited | Professional & scientific | 2014 |
| Whiteflower Limited | Professional & scientific | 1998 |
| Whitewebs UK Limited | Other services | 2008 |
| Whiting Building Service's Ltd | Construction | 2021 |
| Whitsy Wellbeing Limited | Wholesale & retail | 2021 |
| Whittles Hall (Chelmsford) Management Company Limited | Real estate | 2016 |
| Whittlesey Brothers Ltd. | Wholesale & retail | 2022 |
| Whlp Limited | Real estate | 2017 |
| WHM Pet Group Limited | Wholesale & retail | 1989 |
| Whole Picture Research and Consultancy Ltd | Professional & scientific | 2024 |
| WHQ Rentals 2 Limited | Construction | 2024 |
| WHQ Rentals a Limited | Real estate | 2024 |
| WHQ Rentals Limited | Construction | 2021 |
| Wiame John EJ Ltd | Administrative & support | 2023 |
| WIB Consulting Ltd | Professional & scientific | 2019 |
| Wick and MIX Ltd | Wholesale & retail | 2020 |
| Wicked Rabbit Entertainment Limited | Professional & scientific | 2005 |
| Wicked Rabbit Limited | Wholesale & retail | 2010 |
| Wickford Development Company Limited | Construction | 1963 |
| Wickford Group Ltd | Financial services | 2025 |
| Wicks Construction & Engineering Ltd | Construction | 2021 |