| Yuanqi Food Limited | Manufacturing | 2025 |
| Yucansoft Technologies & Consulting Limited | Information & communication | 2019 |
| Yucel Repair Centre Ltd | Manufacturing | 2023 |
| Yudi Xinyuan Digital International Exchange Ltd | Wholesale & retail | 2022 |
| Yuexiang Culture Media Ltd | Information & communication | 2025 |
| Yufan Technology Co., Ltd | Wholesale & retail | 2025 |
| Yuhua Group Ltd | Manufacturing | 2025 |
| Yuhua Tricycle Parts Co., Ltd | Wholesale & retail | 2023 |
| Yummilish Catering Limited | Hospitality | 2023 |
| Yummy Cafe Ltd | Hospitality | 2023 |
| Yummy Drinks Ltd | Wholesale & retail | 2025 |
| Yummy Greek Ltd | Hospitality | 2021 |
| YUN Pharmchem Co., Ltd | Extraterritorial | 2019 |
| Yuncheng Yiteng Electronics Co., Ltd | Wholesale & retail | 2024 |
| Yunding Ltd | Administrative & support | 2025 |
| Yuning Ruifu Limited | Wholesale & retail | 2025 |
| Yuns Management Limited | Real estate | 2018 |
| Yunyiyun Limited | Wholesale & retail | 2025 |
| Yurom Ltd | Manufacturing | 2025 |
| Yusalix Group Ltd | Extraterritorial | 2020 |
| Yusha Ltd | Wholesale & retail | 2013 |
| Yushen Hydraulics Co., Ltd | Extraterritorial | 2024 |
| Yutian Capital Ltd | Financial services | 2026 |
| Yuxin Commercial Limited | Other services | 2020 |
| Yuzheng Valve Pipe-Fitting Co., Ltd | Extraterritorial | 2011 |
| YVC Ltd | Health & social care | 2015 |
| YY MEI Ltd | Manufacturing | 2025 |
| Z & S Services Cambridge Limited | Health & social care | 2025 |
| Z DAR Ltd | Manufacturing | 2019 |
| Z Group Asset Management Ltd | Real estate | 2025 |
| Z U Trans Limited | Transport & logistics | 2024 |
| Z Walton Mortgages Ltd | Financial services | 2019 |
| Z&A Autos Limited | Wholesale & retail | 2018 |
| Z&L International Holding Limited | Wholesale & retail | 2025 |
| Z-Subsea Energies Ltd | Professional & scientific | 2011 |
| ZA Pharma Ltd | Health & social care | 2022 |
| Zaartec Ltd | Information & communication | 2022 |
| Zabbaleen Products Ltd | Wholesale & retail | 2018 |
| Zacun Ltd | Wholesale & retail | 2026 |
| Zagara in Fiore Ltd | Wholesale & retail | 2025 |
| Zaikine Research and Consulting Limited | Professional & scientific | 2010 |
| Zainab Gandhi Ltd | Professional & scientific | 2018 |
| Zainavila Ltd | Real estate | 2021 |
| Zaizah Ltd | Wholesale & retail | 2023 |
| Zak’S Auto Services Ltd | Wholesale & retail | 2026 |
| Zala Stores Histon Ltd | Wholesale & retail | 2026 |
| Zala Stores Ltd | Wholesale & retail | 2024 |
| Zala UK Ltd | Wholesale & retail | 2018 |
| Zamanak Helw Ltd | Hospitality | 2025 |
| Zambeel Machine Craft Ltd | Information & communication | 2026 |
| Zandy Investment Ltd | Financial services | 2026 |
| Zanite Limited | Manufacturing | 2025 |
| Zanliff Ltd | Real estate | 2024 |
| Zapeo Limited | Professional & scientific | 2022 |
| Zapilo Limited | Information & communication | 2025 |
| Zapmix Ltd | Hospitality | 2024 |
| Zapp Driving School Ltd | Education | 2025 |
| Zapp Ladies 1ST Driving School Ltd | Education | 2025 |
| Zapt Laser TAG Ltd | Arts & recreation | 2023 |
| ZAR Traders Ltd | Construction | 2024 |
| Zara International Trading Company Limited | Wholesale & retail | 2026 |
| Zarapress Limited | Administrative & support | 2018 |
| Zarra Aircraft Maintenance Ltd | Manufacturing | 2022 |
| Zavia.Ai Ltd | Information & communication | 2024 |
| Zaya Tech Limited | Information & communication | 2016 |
| Zayin UK Limited | Real estate | 2020 |
| Zaytuna Robotics Ltd | Manufacturing | 2024 |
| ZC IP Limited | Professional & scientific | 2024 |
| Zccat Asset Holdings Limited | Real estate | 2022 |
| ZCZ Financial Group Co., Ltd. | Financial services | 2025 |
| Zed.Solution Ltd | Professional & scientific | 2019 |
| Zedstone Limited | Households | 1995 |
| ZEE Security Solutions Limited | Administrative & support | 2020 |
| Zeegie Limited | Information & communication | 2023 |
| Zeezwa Ltd | Information & communication | 2026 |
| Zenco (NO. 8) Limited | Professional & scientific | 1994 |
| Zeneca Finance (Netherlands) Company | Professional & scientific | 1992 |
| Zenenorva Co., Ltd | Extraterritorial | 2016 |
| Zenith Manchester (UK) Ltd | Real estate | 2022 |
| Zenith Zone Co., Ltd | Extraterritorial | 2019 |
| Zenos Aviation Ltd | Manufacturing | 2024 |
| Zentro Hive Ltd | Professional & scientific | 2025 |
| Zenza Elite Emporium Limited | Wholesale & retail | 2021 |
| Zeolutions Ltd | Agriculture & fishing | 2017 |
| Zeonify Global Ltd | Information & communication | 2026 |
| Zephyr Sounds Ltd | Information & communication | 2025 |
| Zephyrastone Ltd | Manufacturing | 2026 |
| Zeppelin Bend Ltd | Information & communication | 2024 |
| Zeray Health Care Limited | Health & social care | 2017 |
| Zercurity Ltd | Information & communication | 2018 |
| Zereni Technology Limited | Wholesale & retail | 2024 |
| Zerivon Ltd | Manufacturing | 2025 |
| ZERO25 Ltd | Education | 2016 |
| Zerolag Limited | Extraterritorial | 2023 |
| Zest Event Management Limited | Other services | 2019 |
| Zest School Catering LLP | | 2021 |
| Zestify Trade Ltd | Wholesale & retail | 2025 |
| Zeta Fold Limited | Professional & scientific | 2025 |
| Zeta Property Holdings Ltd | Financial services | 2026 |
| Zeta Property Limited | Real estate | 2017 |