| Wayne Mccool Roofing Ltd | Construction | 2010 |
| WB Construxtion Limited | Construction | 2018 |
| WCJ Energy Solutions Limited | Professional & scientific | 2023 |
| WE3BRICKS Ltd | Wholesale & retail | 2024 |
| Week 21 Limited | Financial services | 2010 |
| Weightmaster Trailers Ltd | Manufacturing | 1998 |
| Wellbeing Surgery Limited | Health & social care | 2019 |
| Wells Engineering Services Limited | Professional & scientific | 2004 |
| Wenleys (LUX) Limited | Other services | 2024 |
| Wenleys (Property) Limited | Real estate | 2020 |
| Wenleys Limited | Real estate | 2010 |
| Wentworth House (Lincolnshire) Limited | Construction | 2022 |
| West Common Roofing Limited | Construction | 2013 |
| West London Pain Ltd | Health & social care | 2021 |
| Westhouse Garages Limited | Wholesale & retail | 2007 |
| Westwood Radiology Limited | Health & social care | 2025 |
| Wezlock Distribution Limited | Transport & logistics | 2013 |
| Wezzy-H Ltd | Real estate | 2025 |
| Wheel Repair Specialists Limited | Wholesale & retail | 2012 |
| Wheel With Tabs Creator Network Ltd | Professional & scientific | 2025 |
| Wheelgates Management Limited | Construction | 2026 |
| Whitby Gold Property Investment Ltd | Real estate | 2019 |
| White Lily Reputation Ltd | Professional & scientific | 2024 |
| Whites Home Improvement Ltd | Construction | 2025 |
| Whitworth Chemists Limited | Wholesale & retail | 1999 |
| WHJ Building Solutions Limited | Construction | 2019 |
| Wicked Images Limited | Professional & scientific | 2022 |
| Wickersley 10 CIC | Arts & recreation | 2025 |
| Wide Investments Limited | Health & social care | 2009 |
| Wielgus Ltd | Transport & logistics | 2018 |
| William F.Moore(Warplands)Limited | Agriculture & fishing | 1948 |
| Williams Properties (Lincs) Limited | Real estate | 2023 |
| Williamson Homes Ltd | Real estate | 2024 |
| Willing & Co Limited | Construction | 2024 |
| Willows Consultancy Limited | Health & social care | 2020 |
| Wilson & Cooper Ltd | Other services | 2020 |
| Wilson Breast Surgery Limited | Health & social care | 2026 |
| Wilson Foods Ltd | Hospitality | 2026 |
| Wilson Takeaway Ltd | Hospitality | 2023 |
| Wilson's Veterinary Behaviour Referrals Limited | Professional & scientific | 2026 |
| Wimbledon Urology Ltd | Health & social care | 2012 |
| WIN VIP Ltd | Wholesale & retail | 2025 |
| Windsor Associates Limited | Administrative & support | 2006 |
| Windsor Management Services Ltd | Real estate | 2012 |
| Winnor Developments Ltd | Construction | 2019 |
| Winteringham Farms Limited | Administrative & support | 2011 |
| Winteringham Fields Limited | Hospitality | 2002 |
| Winteringham Properties Limited | Construction | 2003 |
| Winterton Agricultural & Sports Society | Arts & recreation | 1993 |
| Winterton Community Academy | Education | 2012 |
| Winterton Dental Practice Limited | Health & social care | 2014 |
| Winterton Futures C.I.C. | Real estate | 2021 |
| Winterton Rangers Community Interest Company | Administrative & support | 2009 |
| Winwaves Ltd | Administrative & support | 2025 |
| Wired Electrical Systems Limited | Construction | 2004 |
| Wise OWL Private Day Nurseries Limited | Health & social care | 2005 |
| Wise OWL Private Day Nursery Messingham Limited | Real estate | 2011 |
| Wisteria Housing Ltd | Real estate | 2024 |
| Withane Property Services Limited | Real estate | 2017 |
| Wizbond Properties Limited | Real estate | 1981 |
| WKA Ltd | Transport & logistics | 2022 |
| WKH Oncology Limited | Health & social care | 2022 |
| WM Civil Engineering Limited | Professional & scientific | 2015 |
| WMT Transport Limited | Transport & logistics | 2017 |
| Wojtek Haczek Ltd | Transport & logistics | 2018 |
| Wonersh Medical Limited | Health & social care | 2020 |
| Wood Furniture & Interiors Ltd | Wholesale & retail | 2024 |
| Woodley Moss Ltd | Information & communication | 2022 |
| Woodline Timber Ltd | Manufacturing | 2025 |
| Woodrow Style Ltd | Wholesale & retail | 2026 |
| Woodside Cast Stone Limited | Manufacturing | 1982 |
| Woodside UK Services Ltd | Administrative & support | 2019 |
| Words by Natalie Limited | Information & communication | 2018 |
| WORKING247 Ltd | Information & communication | 2020 |
| World Barber Limited | Other services | 2022 |
| Worldwide Finance Solutions Limited | Professional & scientific | 2009 |
| WR Trans Ltd | Transport & logistics | 2024 |
| Wrendoch Safety Ltd | Professional & scientific | 2022 |
| Wright Property Lettings Ltd | Real estate | 2023 |
| Wroot Contracts Limited | Construction | 2013 |
| Wroot Homes Ltd | Construction | 2016 |
| Wtfudgeuk Ltd | Manufacturing | 2019 |
| Wyrven Services Limited | Professional & scientific | 2023 |
| Wyvern Medical Services Limited | Health & social care | 2018 |
| X2X Energy Ltd | Professional & scientific | 2025 |
| X2X Group Ltd | Financial services | 2025 |
| XA Transport Ltd | Transport & logistics | 2021 |
| XIN Winner Limited | Hospitality | 2023 |
| Xing YUN Limited | Hospitality | 2022 |
| Yalo Design Services Limited | Professional & scientific | 2021 |
| Yanis One Limited | Transport & logistics | 2019 |
| Yara Medical Limited | Health & social care | 2024 |
| Yardley Ltd | Agriculture & fishing | 2025 |
| Yards Apart Limited | Other services | 2010 |
| YD (Scunthorpe) Ltd | Real estate | 2013 |
| YES One Software Ltd | Information & communication | 2018 |
| Yildirim 27 Ltd | Hospitality | 2025 |
| Yimby Limited | Professional & scientific | 2021 |
| YJ Express Ltd | Wholesale & retail | 2015 |
| YJS Associates Ltd | Other services | 2023 |