| Wilson & Sons Contractors Ltd | Other services | 2023 |
| WIN Accountancy Limited | Professional & scientific | 2012 |
| Window Wise (2010) Limited | Construction | 2010 |
| Wing & Alan Limited | Real estate | 2026 |
| Wings Industry Co., Ltd. | Extraterritorial | 2015 |
| Winners Arabia Ltd | Wholesale & retail | 2025 |
| Winwork International Limited | Extraterritorial | 2023 |
| Wire London Electrical Ltd | Construction | 2021 |
| Wiseman Realty Ltd | Construction | 2019 |
| Withy Lane Residents Management Limited | Households | 1970 |
| Wizintech Ltd | Information & communication | 2019 |
| Wizprime Ltd | Information & communication | 2025 |
| Wizz Scaffolding Limited | Construction | 2015 |
| WJ Bennett Windows Ltd | Construction | 2021 |
| WJF GAS Services Ltd | Construction | 2012 |
| WKC Csplan Limited | Administrative & support | 2023 |
| WL Builders Ltd | Construction | 2014 |
| Wlnh (Holdings) Ltd | Professional & scientific | 2021 |
| WLP Investment Ltd | Real estate | 2020 |
| WMC Mart UK Ltd | Wholesale & retail | 2024 |
| Wnets Ltd | Information & communication | 2025 |
| WOK CHI Limited | Hospitality | 2020 |
| Women and Girls Oasis (Wago) CIC | Arts & recreation | 2026 |
| Women in Mining Africa | Health & social care | 2024 |
| Wongs 303 Limited | Hospitality | 2025 |
| Woodberry Homes Ltd | Real estate | 2026 |
| Woodio International Trade Ltd | Wholesale & retail | 2020 |
| Woodlands Performance Ltd | Arts & recreation | 2026 |
| Woodruffs Limited | Wholesale & retail | 1999 |
| Woods & Parsons Developments Limited | Real estate | 2022 |
| Woodside Forestry Limited | Agriculture & fishing | 2008 |
| World Credit Limited | Hospitality | 2001 |
| World League for the Right to Happines (Wlrh) Ltd | Professional & scientific | 2018 |
| World Life Media Limited | Professional & scientific | 2008 |
| WRD Systems Integration Ltd | Construction | 2020 |
| Wright Group International Ltd | Arts & recreation | 2020 |
| Www.Comb Limited | Other services | 2003 |
| Xcarbon Limited | Professional & scientific | 2008 |
| Xenova Exim Ltd | Wholesale & retail | 2026 |
| XIN YAN Industrial Limited | Extraterritorial | 2015 |
| Xinga Marine Engineering Co., Ltd | Wholesale & retail | 2025 |
| Xinhua Beauty Co. Limited | Administrative & support | 2021 |
| Xinkai Industry Co., Ltd. | Extraterritorial | 2022 |
| Xinsheng Trading Co., Limited | Administrative & support | 2022 |
| Xinying Industrial Co., Ltd | Wholesale & retail | 2023 |
| Xmplr Ltd | Information & communication | 2026 |
| Xnqra LLP | | 2023 |
| Xpax Ltd | Transport & logistics | 2018 |
| Xyman Ltd | Information & communication | 2025 |
| Xynamic Ltd | Professional & scientific | 2023 |
| Y & SON Plumbing Ltd | Construction | 2019 |
| Y Logistics Ltd | Transport & logistics | 2025 |
| Y&R Logistics Ltd | Transport & logistics | 2025 |
| YA Secretarial Services Limited | Administrative & support | 2022 |
| Yahya Growth Limited | Wholesale & retail | 2025 |
| Yapp Management Limited | Professional & scientific | 2021 |
| Yari London Construction Ltd | Construction | 2025 |
| Yates Engineering Services Limited | Manufacturing | 2002 |
| Yayu Properties Limited | Real estate | 2023 |
| YBA Construction Ltd | Construction | 2022 |
| Yellow Mobile Global Ltd | Information & communication | 2022 |
| Yellow Rock Mountain Advisory Ltd | Professional & scientific | 2023 |
| Yellowelephantsco Ltd | Wholesale & retail | 2020 |
| YES Games UK Ltd | Information & communication | 2025 |
| Yifan Inport and Export Co., Limited | Administrative & support | 2024 |
| Yihan Industrial Co., Limited | Wholesale & retail | 2023 |
| Yijia International Trading Co., Ltd | Wholesale & retail | 2020 |
| Yiwu Air Filter E-Commerce Co. , Ltd. | Administrative & support | 2020 |
| Yiwu Kefei Import and Export Co., Ltd | Administrative & support | 2022 |
| Yiwu Phoenix Hardware Trading Co., Ltd. | Extraterritorial | 2019 |
| Yiwu Radius Supply Chain Management Co., Ltd | Wholesale & retail | 2019 |
| Yoga Elements Ltd | Education | 2020 |
| Yogi Alliance Limited | Other services | 2026 |
| Yonglian Metal Co., Limited | Administrative & support | 2017 |
| York Road Developers Ltd | Real estate | 2020 |
| Youngsun Arts & Crafts Co., Ltd. | Extraterritorial | 2022 |
| Young’S Services Ltd | Agriculture & fishing | 2021 |
| Your Accounting Team Ltd | Professional & scientific | 2021 |
| Your Choice Drives & Patios Ltd | Construction | 2021 |
| Your House OUR House Limited | Administrative & support | 2025 |
| YOURS2SHARE Ltd | Information & communication | 2006 |
| Yousfani's Limited | Professional & scientific | 2011 |
| Youthbuild Ventures,Uk | Education | 2018 |
| Youthful, Glowing Skin Aesthetic Ltd | Other services | 2026 |
| YPS Consulting Ltd | Professional & scientific | 2016 |
| YPS Homes Limited | Real estate | 2023 |
| YU Chen Trade Limited | Wholesale & retail | 2022 |
| Yuantou International Trading Limited | Wholesale & retail | 2025 |
| Yuma Ship Engineering (Hongkong) Ltd | Wholesale & retail | 2020 |
| Yundi Ltd | Real estate | 2021 |
| Yuniv Limited | Real estate | 2022 |
| Yunshan Technology (Foshan) Co., Ltd | Wholesale & retail | 2025 |
| YZE Hitech Co., Ltd | Administrative & support | 2023 |
| Z&A Traders Ltd | Wholesale & retail | 2021 |
| ZAH Technology Ltd | Professional & scientific | 2023 |
| Zalmus Ltd | Information & communication | 2019 |
| Zamax (UK) Limited | Professional & scientific | 2002 |
| Zamaya Limited | Real estate | 2025 |
| Zanderal Limited | Health & social care | 2018 |
| Zanen-Zanen Limited | Wholesale & retail | 2018 |