| Withy Farm Limited | Agriculture & fishing | 2020 |
| Wittegen Press Ltd | Information & communication | 2010 |
| Wizbix Services Limited | Wholesale & retail | 2023 |
| WLR Weybridge Yard Ltd | Real estate | 2025 |
| Wolff Automotive Limited | Wholesale & retail | 2023 |
| Women's Wealth Ltd | Financial services | 2018 |
| Wonky Pictures Limited | Information & communication | 2022 |
| Woodbrook Management Company Limited | Households | 1999 |
| Wooden Sky Building & Roofing Co Ltd | Construction | 2025 |
| Woodland Forestry (Adisham) Limited | Agriculture & fishing | 2019 |
| Woodlands Farm (Calcott) Limited | Real estate | 2023 |
| Woodlands SPV1 Ltd | Construction | 2025 |
| Woods Commercial Properties Limited | Real estate | 2026 |
| Wool Classics Holdings Limited | Financial services | 2023 |
| Wool Classics Kent Limited | Manufacturing | 2021 |
| Wool Classics London Limited | Manufacturing | 2015 |
| Wootton Management Company (Petham) Limited | Households | 1998 |
| Workforce Dimensions Limited | Professional & scientific | 2015 |
| Worldwild CIC | Agriculture & fishing | 2019 |
| WP 2D Limited | Real estate | 2020 |
| Wpag CIC | Public administration | 2024 |
| Wrentham Estates Limited | Other services | 1930 |
| Wrightforge 3D Ltd | Manufacturing | 2025 |
| Write Strategy Limited | Professional & scientific | 2011 |
| WS Builders Kent Limited | Construction | 2026 |
| WTF Driving Limited | Transport & logistics | 2017 |
| Wugong CIC | Arts & recreation | 2016 |
| WWW Development & Management Ltd | Construction | 2022 |
| Wynwood Partners Limited | Financial services | 2023 |
| Wyoming Properties Limited | Construction | 2005 |
| WYT Co Properties Ltd | Real estate | 2025 |
| X-E-R-T Ltd | Arts & recreation | 2024 |
| X-Reed Limited | Manufacturing | 2017 |
| X-T-I-N-C-T Editions Limited | Arts & recreation | 2017 |
| X-T-I-N-C-T Ltd | Arts & recreation | 2024 |
| X-T-I-N-C-T Studios Ltd | Arts & recreation | 2024 |
| X-T-I-N-C-T-I-O-N Holdings Ltd | Arts & recreation | 2017 |
| X:Drive Computing Limited | Information & communication | 1999 |
| Xard Limited | Hospitality | 2025 |
| Xcel Construction Services Ltd | Construction | 2023 |
| XCR Ltd | Wholesale & retail | 2025 |
| Xenos BIO Limited | Professional & scientific | 2023 |
| Xentelligent Ltd | Information & communication | 2010 |
| XLB Consulting Ltd | Information & communication | 2025 |
| XO Electrical Services Ltd | Construction | 2020 |
| Xperience Realty Limited | Construction | 2006 |
| YAA Murphy.So Ltd | Health & social care | 2023 |
| Yalding Investments Limited | Wholesale & retail | 2025 |
| Yantr Ltd | Administrative & support | 2024 |
| Yellowstone Events Limited | Arts & recreation | 2013 |
| Yesterday Today and Tomorrow Care Ltd | Health & social care | 2023 |
| Yilin Limited | Manufacturing | 2021 |
| YK Green Glow Service Ltd | Administrative & support | 2026 |
| YM Driving School Ltd | Education | 2023 |
| Yockletts Farm Barns Residents Company Limited | Households | 2009 |
| Yoga Generation Limited | Other services | 2016 |
| Yolande Barnes Consulting Limited | Professional & scientific | 2025 |
| Young Landscapes Ltd | Administrative & support | 2025 |
| Young Properties Ltd | Construction | 2015 |
| Youngboats Limited | Administrative & support | 2005 |
| Your CRM Ltd | Information & communication | 2016 |
| Yova Auto Limited | Wholesale & retail | 2026 |
| YSC the Agency Ltd | Professional & scientific | 2026 |
| YSG Global Ltd | Real estate | 2025 |
| Ytms Ltd | Hospitality | 2025 |
| YU & HE Limited | Wholesale & retail | 2022 |
| Yunavi Ltd | Wholesale & retail | 2023 |
| Z-Talent Limited | Hospitality | 2021 |
| Zachary Parker Limited | Real estate | 2024 |
| Zahid Pro MAX Limited | Wholesale & retail | 2025 |
| Zaidah Healthcare Solutions Limited | Administrative & support | 2024 |
| Zain Telecom Limited | Manufacturing | 2022 |
| Zainab & Ahmad Medical Limited | Health & social care | 2015 |
| ZAR Utilities Ltd | Construction | 2025 |
| ZEN Works Contracting Ltd | Construction | 2025 |
| Zeng INT Ltd | Wholesale & retail | 2021 |
| Zennture Limited | Professional & scientific | 2010 |
| Zephyr Air Conditioning Ltd | Energy | 2023 |
| Zero UP Entertainment, (UK), Ltd | Information & communication | 2021 |
| Zeus Grill Ltd | Hospitality | 2026 |
| Zeya Records Ltd | Manufacturing | 2026 |
| ZGD Events Ltd | Administrative & support | 2022 |
| Ziist Foods Ltd | Wholesale & retail | 2025 |
| Zimzala Holdings Limited | Information & communication | 2026 |
| Zinc Buffets Limited | Hospitality | 2016 |
| Zink Studios Ltd | Other services | 2022 |
| Ziomsky Ltd | Real estate | 2024 |
| Ziya & Sons Property Limited | Real estate | 2003 |
| ZM Dealers Ltd | Wholesale & retail | 2026 |
| Zoas Health Limited | Health & social care | 2025 |
| Zoas Holdings Limited | Health & social care | 2025 |
| Zoas Limited | Health & social care | 1997 |
| Zoas Property Limited | Real estate | 2018 |
| ZOE Alexander UK Ltd | Manufacturing | 2011 |
| Zoology Ltd | Other services | 2022 |
| Zoom in Private Ltd | Wholesale & retail | 2021 |
| Zzkj Consulting Ltd | Information & communication | 2016 |