| Woodhouse Properties Kent Ltd | Real estate | 2024 |
| Woodrose Holdings Limited | Professional & scientific | 2008 |
| Woods Project Services Limited | Construction | 2017 |
| Woodside Property Group Ltd | Hospitality | 2023 |
| Woodstock Land Limited | Construction | 2018 |
| Word Consulting Ltd | Professional & scientific | 2013 |
| Worksystems Office Solutions UK Limited | Other services | 2025 |
| World Revivalists Limited | Professional & scientific | 2025 |
| Worldwide Choices Ltd | Wholesale & retail | 2025 |
| Wows Property Ltd | Real estate | 2025 |
| WPP Financial Services Limited | Financial services | 2014 |
| Wreny Water Service Ltd | Construction | 2023 |
| Wright Construction Limited | Construction | 2005 |
| Wrights Strood Limited | Extraterritorial | 2012 |
| Wrightway Transport Solutions Ltd | Transport & logistics | 2024 |
| Wrinkly Ravers Ltd | Hospitality | 2023 |
| WRM Property Services Ltd | Construction | 2021 |
| Wrotham Developments Ltd | Construction | 2022 |
| WS Trading Global Limited | Wholesale & retail | 2020 |
| WSE Bourton Road Limited | Energy | 2020 |
| Wwincheser Limited | Professional & scientific | 2025 |
| Wysiwyg Computers Limited | Information & communication | 2021 |
| X83 Solutions Limited | Wholesale & retail | 2023 |
| Xandria Limited | Information & communication | 2026 |
| XC Motorsport Ltd | Arts & recreation | 2021 |
| Xcel Play Ltd | Information & communication | 2025 |
| XFI Networks Ltd | Information & communication | 2024 |
| Xperisoft Limited | Information & communication | 2010 |
| Xperts Services Ltd | Real estate | 2020 |
| Xpress Windows Ltd | Construction | 2024 |
| Xtyartistry Ltd | Other services | 2025 |
| Yade Pharma Ltd | Administrative & support | 2022 |
| YAH Tehillah Limited | Health & social care | 2025 |
| Yakira Ltd | Professional & scientific | 2024 |
| Yandle Associates Limited | Professional & scientific | 2018 |
| Yanko Limited | Construction | 2016 |
| Yaxley Garage Rentals Ltd | Real estate | 2014 |
| Yeah Buddy Property Ltd | Real estate | 2025 |
| Yeh's Enterprise Ltd | Real estate | 2025 |
| Yellow House Asikuma Limited | Construction | 2025 |
| YES PC Solutions Ltd | Information & communication | 2015 |
| YES to Your Request Limited | Information & communication | 2021 |
| Yesterday Reborn Ltd | Professional & scientific | 2018 |
| YEW Tree 1967 Limited | Extraterritorial | 2013 |
| Yewtree Landscapes Ltd | Administrative & support | 2017 |
| YG Construction Limited | Construction | 2023 |
| YGT Agency Ltd | Professional & scientific | 2024 |
| Yieldstone Property Group Ltd | Real estate | 2026 |
| YNS Solutions Ltd | Health & social care | 2012 |
| Yoga - UN Limited | Education | 2019 |
| Yomkog Ltd | Health & social care | 2022 |
| Yonda Hair and Beauty Ltd | Other services | 2022 |
| Yonda Limited | Administrative & support | 2018 |
| Yordanov BG Ltd | Construction | 2020 |
| Yoria Technologies Limited | Information & communication | 2026 |
| YOU NOW Have Digital Ltd | Information & communication | 2016 |
| YOU Spec Ltd | Construction | 2019 |
| YOU1ST Limited | Public administration | 2022 |
| Youceef Services Ltd | Health & social care | 2022 |
| Youngs Building Surveying Services Limited | Professional & scientific | 2016 |
| Your Energy Ltd | Energy | 2017 |
| Your Franking Ltd | Administrative & support | 2013 |
| Your Help Limited | Health & social care | 2010 |
| Your Inner Voice Limited | Professional & scientific | 2024 |
| Your Mortgage Advice Partner Ltd | Extraterritorial | 2018 |
| Yourtourlink Ltd | Information & communication | 2020 |
| Youth Kent C.I.C. | Education | 2022 |
| YSA Services Ltd | Administrative & support | 2022 |
| Yvonne Patricia Stocker Ltd | Real estate | 2013 |
| Z & Z Security & Cleaning Services Ltd | Administrative & support | 2023 |
| Z-Latte Limited | Hospitality | 2019 |
| Zack Treliving Ltd | Arts & recreation | 2023 |
| Zainain Ltd | Hospitality | 2024 |
| ZAK Star Productions Limited | Information & communication | 2012 |
| Zammit Heating & GAS Ltd | Construction | 2020 |
| ZAP ZAP Zoom Limited | Professional & scientific | 2023 |
| ZAR Construction Ltd | Construction | 2013 |
| Zarsi Estates Ltd | Real estate | 2024 |
| Zayden Accounting (Medway) Limited | Professional & scientific | 2019 |
| Zaynetss Ltd | Construction | 2025 |
| Zaza Luxury Transport Ltd | Transport & logistics | 2021 |
| Zazie Business Services Ltd | Administrative & support | 2015 |
| ZEN Medical Ltd | Health & social care | 2021 |
| Zenico Racing Ltd | Administrative & support | 2025 |
| Zenif Studio Ltd | Professional & scientific | 2020 |
| Zenithzone Consult Ltd | Education | 2025 |
| Zera Innovations Ltd | Information & communication | 2021 |
| Zero 51 Limited | Construction | 2017 |
| Zeta Foods Ltd | Wholesale & retail | 2026 |
| Zeus Electrical Services Limited | Construction | 2015 |
| ZFD Ltd | Health & social care | 2026 |
| Zigfrid Limited | Hospitality | 2003 |
| Zigzag Modern Limited | Wholesale & retail | 2018 |
| Zihuatanejo Films Limited | Information & communication | 2022 |
| ZIK Expert Teachers Ltd | Education | 2017 |
| Ziki Housing Ltd | Real estate | 2026 |
| Zilver Designs Limited | Wholesale & retail | 2005 |
| Zinoworks Limited | Wholesale & retail | 2026 |
| Zizzle Ltd | Wholesale & retail | 2025 |
| ZJ Tops Pizza Ltd | Hospitality | 2025 |