| Winter James Ltd | Other services | 2022 |
| Wire Group Ltd | Construction | 2024 |
| Wise Monkey Recruitment Ltd | Administrative & support | 2023 |
| Wise Solution KDK Ltd | Construction | 2026 |
| With Love by Kate Ltd | Arts & recreation | 2022 |
| WKD Business Solutions Limited | Professional & scientific | 2010 |
| WM Accounting Services Limited | Professional & scientific | 2022 |
| Wolfberry Limited | Professional & scientific | 2025 |
| Wolfensohn Investments Limited | Real estate | 2015 |
| Wolfram Advisory Ltd | Professional & scientific | 2025 |
| Wonderful Things Photography Limited | Professional & scientific | 2022 |
| Wonderland Estates Ltd | Real estate | 2021 |
| Wood Lane (Hemel Hempstead) Management Company Limited | Households | 2019 |
| Wood Street (Barnet) Management Company Limited | Households | 1987 |
| Wood Street Solutions Ltd | Professional & scientific | 2025 |
| Woodberry AID | Health & social care | 2020 |
| Woodborough Grange Management Company (Winscombe) Limited | Real estate | 2019 |
| Woodburg Development Ltd | Construction | 2023 |
| Woodcraft and Iron Works Ltd | Manufacturing | 2025 |
| Woodcroft (Eltham) Management Company Limited | Households | 2012 |
| Woodfield Plantation Management Company Limited | Households | 2002 |
| Woodgate Park (Management) Limited | Households | 2007 |
| Woodhall Farm Social Club Limited | | 1988 |
| Woodlands Centre for Dentistry Limited | Real estate | 2026 |
| Woodlands Grange Management Company (Port Sunlight) Limited | Households | 2007 |
| Woodpecker Drive Ltd | Households | 2021 |
| Woodpecker Drive RTM Company Limited | Households | 2022 |
| Woods Pharmacy Limited | Wholesale & retail | 2019 |
| Woodside Green (Croydon) NO.3 Residents Company Limited | Households | 1986 |
| Woodside Residents Association (New HAW) Limited | Households | 2010 |
| Woodside View Residents Ltd | Households | 2024 |
| Woodstock Logistics Limited | Transport & logistics | 2008 |
| Worden Green Recruitment Ltd | Administrative & support | 2022 |
| Work Express Ltd | Transport & logistics | 2017 |
| Works and Works Again Ltd | Professional & scientific | 2020 |
| Workstation Solutions Ltd | Information & communication | 2018 |
| Worktop Warehouse U.K. Limited | Other services | 2023 |
| Workwright Limited | Professional & scientific | 2023 |
| World in Style Limited | Administrative & support | 2018 |
| World in Style Travel Limited | Administrative & support | 2018 |
| World of Nutrition Ltd | Hospitality | 2020 |
| World Sweets and Treats Limited | Wholesale & retail | 2025 |
| Worthy Engineering Ltd | Construction | 2014 |
| WOW Guru Limited | Wholesale & retail | 2021 |
| Wowo Detailing Ltd | Other services | 2024 |
| WOY Work on YOU Ltd | Wholesale & retail | 2025 |
| WR15 Ltd | Professional & scientific | 2023 |
| Wragg Trade Consultants Ltd | Professional & scientific | 2022 |
| Wrap Wxrks Limited | Wholesale & retail | 2019 |
| WRE Education Consultants Ltd | Education | 2012 |
| Wrens Court Freehold Limited | Households | 2018 |
| Wright Choice Building and Roofing Solutions Ltd | Construction | 2025 |
| Wright-Browne & Smith Limited | Real estate | 2016 |
| Wroughton Management Company Limited | Households | 2018 |
| Wroughton Studios Limited | Real estate | 2021 |
| WSA Contracts Ltd | Construction | 2026 |
| WT Properties Ltd | Real estate | 2018 |
| Wycombe Communications Ltd | Professional & scientific | 2024 |
| Wynnstay Solutions Ltd | Information & communication | 2022 |
| Wyvern Place Resident Management Company Limited | Households | 2024 |
| WZ Developments Ltd | Construction | 2025 |
| X Forces Abseiling Limited | Construction | 2019 |
| X2 Innovations Ltd | Information & communication | 2016 |
| XAI Tech Ltd | Information & communication | 2023 |
| XEL7 Ltd | Professional & scientific | 2015 |
| Xelabiz Ltd | Information & communication | 2012 |
| Xerox Pensions Limited | Financial services | 1971 |
| Xguard Automation Limited | Information & communication | 2024 |
| Xhini's Construction Ltd | Construction | 2023 |
| Xiangda Ltd | Hospitality | 2023 |
| Xiangda Property Ltd | Real estate | 2026 |
| Xpublish Ltd | Information & communication | 2023 |
| XYZ 3D GEO Ltd | Construction | 2024 |
| Y.Z.A Property Ltd | Real estate | 2022 |
| Yadah TV Partners in EU Ltd | Other services | 2022 |
| Yanni Groundworks and Paving Ltd | Construction | 2026 |
| Yanny Goldman Ltd | Information & communication | 2023 |
| Yatesons Ltd | Information & communication | 2021 |
| Yatura Limited | Professional & scientific | 2024 |
| Yellow Lizard Media Limited | Extraterritorial | 2013 |
| Yellowfields Phase 3B Management Company Limited | Households | 2022 |
| YEW Tree Court (Boxmoor) Management Company Limited | Households | 1985 |
| YEW Tree Gardens (Cholsey) Management Company Limited | Households | 2018 |
| YJD Construction Limited | Construction | 2025 |
| Yo'Tism Ltd | Health & social care | 2016 |
| Yoprel Ltd | Information & communication | 2025 |
| York House Management Hitchin Ltd | Real estate | 2017 |
| YOU Create Limited | Wholesale & retail | 2016 |
| YOU Shoot Ltd. | Professional & scientific | 2012 |
| Young Lion Entertainment Ltd | Information & communication | 2022 |
| Youngkirk Limited | Professional & scientific | 1995 |
| Younique Minds CIC | Administrative & support | 2020 |
| Your Bath Guide Ltd | Professional & scientific | 2022 |
| Your Choice Childcare Services Limited | Health & social care | 2016 |
| Your Family's Friend Ltd | Administrative & support | 2024 |
| Your London Publishing CIC | Information & communication | 2025 |
| YSY Real Estate Ltd | Real estate | 2018 |
| YTO Business Solutions Ltd | Professional & scientific | 2010 |
| YUM YUM Oriental Ltd | Hospitality | 2022 |
| Yvette Sowerby Consulting Ltd | Professional & scientific | 2022 |