| Wells Electrical Contracting Ltd | Construction | 2024 |
| Wembley Park Properties LLP | | 2022 |
| Wendy-Leigh Creative Media Ltd | Other services | 2026 |
| West Alloy Limited | Extraterritorial | 1952 |
| West Nottinghamshire Properties Limited | Real estate | 1973 |
| West One Transport Ltd | Transport & logistics | 2025 |
| Westside Store Ltd | Wholesale & retail | 2022 |
| Westside Transport Ltd | Transport & logistics | 2017 |
| Whatu Training Limited | Wholesale & retail | 2025 |
| Wheeltrans Ltd | Transport & logistics | 2025 |
| Whites Electrical Contractors Ltd | Construction | 2011 |
| Whitethor Ltd | Wholesale & retail | 2014 |
| Whitwick Carpets Ltd | Construction | 2020 |
| Wichelstowe LLP | | 2017 |
| Wight Building Materials Ltd | Mining & quarrying | 2013 |
| Wigston Paper and Board | Wholesale & retail | 1955 |
| Wigston Paper Limited | Wholesale & retail | 2017 |
| Wildgoose Education Limited | Education | 2008 |
| Wildwood Shepherds Huts Limited | Hospitality | 2021 |
| Wiley Electrical Ltd | Construction | 2025 |
| Wilfred Ernest Limited | Construction | 2021 |
| William Corah & SON Limited | Professional & scientific | 1924 |
| William Corah Joinery Limited | Extraterritorial | 1976 |
| Willow Farm Management Company Limited | Administrative & support | 1998 |
| Wilmor Developments Limited | Real estate | 2024 |
| Wilson Bowden (Atlantic Quay Number 2) Limited | Construction | 2005 |
| Wilson Bowden (Ravenscraig) Limited | Construction | 2001 |
| Wilson Bowden City Homes Limited | Construction | 2000 |
| Wilson Bowden Developments Limited | Construction | 1969 |
| Wilson Bowden Group Services Limited | Professional & scientific | 1984 |
| Wilson Bowden Limited | Professional & scientific | 1986 |
| Wiltshire Heavy Building Materials Limited | Extraterritorial | 2002 |
| Windmill Recruitment Ltd | Administrative & support | 2021 |
| Windmill Support Limited | Administrative & support | 2018 |
| Window Mate (Leicestershire) Limited | Wholesale & retail | 2003 |
| Wisehall Digital Ltd | Professional & scientific | 2020 |
| Witenagemot Ltd | Financial services | 2021 |
| With Kari Limited | Professional & scientific | 2021 |
| Witherley Services Limited | Professional & scientific | 1998 |
| WL Accountancy Services Ltd | Professional & scientific | 2005 |
| WOK Express (Leicester) Limited | Hospitality | 2015 |
| Wolfgang Airsoft Limited | Arts & recreation | 2018 |
| Woodbine Financial Solutions Limited | Financial services | 2015 |
| Woodhall Spa Sand & Gravel Limited | Professional & scientific | 1934 |
| Woodhouse Fish & Chips Ltd | Hospitality | 2026 |
| Workplace Fireshield Limited | Other services | 2026 |
| Workplace Safety Management Limited | Other services | 2002 |
| Workplace Safety Products Ltd | Wholesale & retail | 2019 |
| World of Sheds Limited | Other services | 2016 |
| WP Communications Limited | Information & communication | 2018 |
| WP Hart Investments Ltd | Real estate | 2022 |
| WR Lettings Ltd | Real estate | 2021 |
| Wrestpark Properties Ltd | Real estate | 2016 |
| WS Security Consultancy Limited | Administrative & support | 2026 |
| Wynwood Logistics Ltd | Transport & logistics | 2019 |
| Wyred Media Ltd | Professional & scientific | 2024 |
| Xclusive Home Improvements Ltd | Construction | 2020 |
| Xdmc Limited | Professional & scientific | 2020 |
| Xectra Limited | Professional & scientific | 2017 |
| XMC Properties Ltd | Real estate | 2012 |
| Y29 Ltd | Construction | 2019 |
| Yellow Star Investment Ltd | Wholesale & retail | 2020 |
| Yeovil Developments Limited | Construction | 2004 |
| Yesterday, Today and Forever Church | Other services | 2004 |
| Yo-Yo Desk Ltd | Wholesale & retail | 2017 |
| Yo-Yo Office Limited | Manufacturing | 2014 |
| Yompfit Ltd | Education | 2019 |
| Yore Global Services Limited | Health & social care | 2021 |
| Zafura Care Provider Ltd | Health & social care | 2023 |
| Zeeko Limited | Manufacturing | 2000 |
| Zekestack Ltd | Information & communication | 2026 |
| Zestbdw LLP | | 2013 |
| Zilen Properties Ltd | Real estate | 2025 |
| Zino Burger Ltd | Hospitality | 2025 |