| Wombat Creative Limited | Information & communication | 2013 |
| Wonder Brothers Limited | Wholesale & retail | 2024 |
| Wonkyappletree Limited | Information & communication | 2015 |
| Woodbank Properties Limited | Real estate | 1960 |
| Woodbridge Green (LEA Road) Management Company Limited | Real estate | 2026 |
| Woodglen Developments Ltd. | Construction | 1995 |
| Woodglen Direct Ltd. | Wholesale & retail | 2002 |
| Woodgrange Developments (Cumbria) Limited | Construction | 2015 |
| Woodgrange Homes Ltd | Construction | 2018 |
| Woodhouse Property Recruitment Ltd | Administrative & support | 2019 |
| Woodhouse Site Engineering Limited | Construction | 2022 |
| Woodlands (Shotley Bridge) Management Company Limited | Real estate | 2012 |
| Woodman Wealth Ltd | Financial services | 2025 |
| Woodpeckers K&B Ltd | Construction | 2022 |
| Woodrow Car Sales Ltd | Wholesale & retail | 2021 |
| Woodside Park (Wigton) Limited | Households | 2018 |
| Woodville Park (Apartments) Limited | Households | 2014 |
| Woodville Park Limited | Households | 2013 |
| Woodyard Place Management Company Ltd | Households | 2017 |
| Woof 'N' Floof Ltd | Extraterritorial | 2023 |
| Wooley Street Limited | Real estate | 2026 |
| Wordforword Arts CIC | Education | 2023 |
| Workbee Limited | Information & communication | 2021 |
| Workclever Limited | Information & communication | 2012 |
| Workington Speedway Limited | Arts & recreation | 2025 |
| World Health Innovation Summit Community Interest Company | Education | 2015 |
| World Nosh Ltd | Wholesale & retail | 2025 |
| World Ostrich Association | Other services | 2002 |
| World Products Online Limited | Wholesale & retail | 2020 |
| World-Wide Education Service (Home School) Limited | Education | 2001 |
| Wormanby Farms Limited | Agriculture & fishing | 2016 |
| Worsley Drafting Services Limited | Professional & scientific | 1980 |
| Worthing Esco Limited | Construction | 2023 |
| Worthing Heat Network Limited | Construction | 2023 |
| Worthington Place Management Limited | Households | 2005 |
| WP Contracting Limited | Administrative & support | 2026 |
| WQ Contracting Limited | Construction | 2026 |
| WQ Electrical Services Limited | Construction | 2022 |
| Wragg Mark-Bell Solicitors Limited | Professional & scientific | 2002 |
| Wrayside Residential Management Limited | Households | 2022 |
| WRC Sales Limited | Wholesale & retail | 2019 |
| Wreay Syke Residents Association Limited | Real estate | 2004 |
| Wren Place Homes Limited | Construction | 2017 |
| Wright Care 2021 Ltd | Health & social care | 2021 |
| Wright Estates Ltd | Real estate | 2024 |
| Wright Land and Property Ltd | Professional & scientific | 2018 |
| Wright Roofing UK Ltd | Construction | 2026 |
| Wright Walker Productions Ltd | Information & communication | 2008 |
| WT Woodley Management Ltd | Extraterritorial | 2023 |
| Www.Taxrebateservices.Co.Uk Limited | Professional & scientific | 2004 |
| Wydoncleughside Farm | | 1987 |
| Wykes Group Ltd | Construction | 2015 |
| X Cars Limited | Extraterritorial | 1985 |
| XLR8 Delivery Ltd | Other services | 2024 |
| Xocolate UK Ltd | Manufacturing | 2018 |
| Xooxoo Limited | Arts & recreation | 2004 |
| Y H Equestrian Limited | Arts & recreation | 2022 |
| Y H Stabling Limited | Agriculture & fishing | 2024 |
| Yakkt Limited | Wholesale & retail | 2020 |
| Yanmore Limited | Real estate | 2002 |
| Yannos Food Supplies Ltd | Wholesale & retail | 2015 |
| Yatesbury Holdings Limited | Professional & scientific | 2013 |
| Yeames Ltd | Energy | 2020 |
| Yellowasp UK Ltd | Real estate | 2002 |
| YEP YEP Ltd | Construction | 2024 |
| Yester Energy Company Limited | Water & waste | 2017 |
| YHP Haulage Ltd | Transport & logistics | 2018 |
| YML 22 Ltd | Transport & logistics | 2023 |
| Yogi's Delight Limited | Hospitality | 2015 |
| YOR Office Ltd | Information & communication | 2022 |
| Young's Roofing & Painting Contractors Limited | Construction | 2024 |
| Yourdigitaltwin Ltd | Information & communication | 2017 |
| YSA Property Solutions Ltd | Real estate | 2022 |
| YTT Consultants Ltd | Professional & scientific | 2025 |
| Zaltaz Holdings Ltd | Wholesale & retail | 2025 |
| Zanii Limited | Real estate | 2025 |
| Zapactive (VR) Ltd | Education | 2020 |
| Zebra Chem Ltd | Wholesale & retail | 2002 |
| ZEE Business Limited | Hospitality | 2023 |
| ZEE Motors Essex Ltd | Wholesale & retail | 2012 |
| Zelak International Limited | Wholesale & retail | 2020 |
| Zelo Creative Limited | Information & communication | 2005 |
| Zenith Orion Ltd | Professional & scientific | 2021 |
| Zentry Solutions Ltd | Administrative & support | 2025 |
| ZIA Outreach Ltd | Other services | 2013 |
| Zibo Ltd | Education | 2026 |
| Zirco Properties Ltd | Households | 2025 |
| Zobbity BOP Ltd | Transport & logistics | 2023 |
| Zokinova Group Ltd | Real estate | 2024 |
| Zonooz Ltd | Real estate | 2022 |
| Zoom Ices Limited | Wholesale & retail | 2025 |
| Zoys Limited | Information & communication | 2015 |
| Zozimus Limited | Professional & scientific | 2013 |
| Zsbr Driving Limited | Transport & logistics | 2014 |
| ZTY Takeaway Ltd | Hospitality | 2026 |
| Zulu Skates Limited | Wholesale & retail | 2007 |
| Zurri Lounge Ltd | Hospitality | 2024 |
| Zydrax Ltd | Transport & logistics | 2025 |