| Winters Lane Storage Services Limited | Transport & logistics | 2023 |
| Winters Roofing Limited | Construction | 2026 |
| Winvictor Ltd | Transport & logistics | 2020 |
| Wired Electrical Group Limited | Construction | 2026 |
| Wiresmartuk Ltd | Construction | 2021 |
| Wiseman (Couston) Limited | Professional & scientific | 2024 |
| Witham Lettings Ltd | Real estate | 2015 |
| Witham Properties Ltd | Real estate | 2025 |
| Witham Residential Ltd | Households | 2026 |
| Wittswood Dura Oak Ltd | Manufacturing | 2022 |
| WJC Euro Foods Limited | Transport & logistics | 2009 |
| Wlodi Haulage Ltd | Transport & logistics | 2023 |
| WMW Transport Ltd | Transport & logistics | 2024 |
| Wojt Ltd | Transport & logistics | 2022 |
| Wojtowicz Transport Ltd | Transport & logistics | 2018 |
| Wolds Sporting Club Ltd | Arts & recreation | 2021 |
| Wolf Windows and Blinds Ltd | Construction | 2021 |
| Wonder of Wellness Healthcare Limited | Extraterritorial | 2023 |
| Wonder of Wellness Holdings Ltd | Financial services | 2023 |
| Wonder of Wellness Ltd | Health & social care | 2018 |
| Wonder of Wellness Online Ltd | Wholesale & retail | 2023 |
| Woodbank Management Co. Limited | Households | 1988 |
| Woodcock Holmes Estate Agents Limited | Real estate | 2004 |
| Woodcock Kindling Supplies Limited | Wholesale & retail | 2015 |
| Woodgate Fencing Ltd | Construction | 2012 |
| Woodhouse Farm Estates Limited | Real estate | 2014 |
| Woodhouse Legal Services Limited | Professional & scientific | 2013 |
| Woodmans Carpentry Service Ltd | Construction | 2024 |
| Woodpecker Transport Limited | Transport & logistics | 2025 |
| Wool Hall Investments Limited | Agriculture & fishing | 2013 |
| Working Consultants Limited | Information & communication | 2013 |
| WORKPLACE4YOU Recruitment Ltd | Agriculture & fishing | 2020 |
| Works by SEB Limited | Professional & scientific | 2024 |
| World Car Parts Limited | Wholesale & retail | 2009 |
| World Talent Psychometrics Ltd | Professional & scientific | 2024 |
| World Truck Ltd | Administrative & support | 2018 |
| Worldwide Fruit Limited | Wholesale & retail | 1999 |
| Worth Farms Limited | Agriculture & fishing | 2002 |
| Worth Farms Produce Group Limited | Professional & scientific | 2007 |
| Worth Farms Produce Limited | Agriculture & fishing | 2016 |
| Wortham Close Management Company Ltd | Households | 2021 |
| Worths Properties Ltd | Real estate | 2020 |
| WPH Group Developments Limited | Financial services | 2018 |
| WPH Group Estates Ltd | Hospitality | 2022 |
| WPH Group Leisure Limited | Hospitality | 2022 |
| WPH Group Limited | Wholesale & retail | 2013 |
| WPH Group Park Sales Limited | Hospitality | 2024 |
| WPH Vehicles Ltd | Wholesale & retail | 2024 |
| WPT Transport Ltd | Transport & logistics | 2017 |
| WPX Logistics Ltd | Transport & logistics | 2025 |
| Wrangle Ranch Ltd | Hospitality | 2025 |
| Wray Trading Limited | Real estate | 2021 |
| WRE Consulting Limited | Information & communication | 2026 |
| Wright & Sandford Properties Limited | Construction | 2016 |
| Wright at Home Investments Ltd | Financial services | 2024 |
| Wright Care at Home Limited | Health & social care | 2018 |
| Wright Racing Engines Ltd | Manufacturing | 2018 |
| Wrightglobal Ltd | Manufacturing | 2013 |
| Wrights & Holbeach Asphalt Limited | Construction | 2000 |
| Wrights Properties Limited | Real estate | 1985 |
| Wrights Residential Property Limited | Real estate | 2024 |
| Write IT Easy Limited | Professional & scientific | 2023 |
| WST Drive Hire Ltd | Transport & logistics | 2025 |
| WT Motorcycles Ltd | Wholesale & retail | 2019 |
| WVB Consulting Limited | Professional & scientific | 2012 |
| Wygate Holdings Ltd | Financial services | 2023 |
| Wykeham Abbey Limited | Extraterritorial | 2011 |
| Wynner Group Ltd | Financial services | 2026 |
| Wzlp Ltd | Administrative & support | 2026 |
| X X X X Ltd | Hospitality | 2005 |
| Xcdslgx Ltd | Administrative & support | 2013 |
| Xcell Electrical Ltd | Construction | 2020 |
| Xcell Enterprises Ltd | Real estate | 2025 |
| Xcell Holdings (Lincs) Ltd | Financial services | 2025 |
| Xeinz Group Limited | Financial services | 1950 |
| Xparkles Ltd | Wholesale & retail | 2025 |
| Xpress Pizza Ltd | Hospitality | 2020 |
| Xpress Pizza Takeaway Ltd | Hospitality | 2025 |
| XRP Logistics Ltd | Wholesale & retail | 2014 |
| Yards and Yards (Cambs) Limited | Financial services | 2025 |
| Yaze Healthcare Ltd | Health & social care | 2021 |
| YBL Hold Limited | Financial services | 2024 |
| Yellowink Digital Limited | Professional & scientific | 2025 |
| Yellowstone Paving Ltd | Administrative & support | 2024 |
| Yesteryears Tearooms Limited | Extraterritorial | 2019 |
| Yieldfree Limited | Transport & logistics | 1992 |
| Yonker Holdings Ltd | Financial services | 2022 |
| Yonutztrans Ltd | Transport & logistics | 2020 |
| Youngs Haulage Ltd | Transport & logistics | 2021 |
| Your Event Support Limited | Arts & recreation | 2018 |
| Your Roofing Specialist Ltd | Construction | 2026 |
| YSL Development Ltd | Construction | 2018 |
| Z N Transport Ltd | Transport & logistics | 2022 |
| Z1 Barber's Group Ltd | Other services | 2025 |
| Zahawi Logistics Ltd | Transport & logistics | 2026 |
| Zapan Trans Ltd | Transport & logistics | 2015 |
| Zapzero Limited | Wholesale & retail | 2003 |
| Zarze Supermarket Limited | Wholesale & retail | 2025 |
| Zbigniew Logistics Ltd | Transport & logistics | 2012 |
| Zeal Financial Consultancy Limited | Professional & scientific | 2024 |