| Zeel Teamex Ltd | Wholesale & retail | 2024 |
| Zeel Technologies Ltd | Wholesale & retail | 2025 |
| Zein Constuctions Ltd | Construction | 2025 |
| Zemivox Ltd | Wholesale & retail | 2025 |
| ZEN Group London Ltd | Construction | 2021 |
| ZEN Hong Kong Limited | Hospitality | 2020 |
| Zenith International GB Limited | Real estate | 2005 |
| Zenith Supplement Ltd | Wholesale & retail | 2018 |
| Zenithgb PLC | Financial services | 2023 |
| Zeno Electrics Ltd | Construction | 2023 |
| Zenq Ltd | Wholesale & retail | 2025 |
| Zentia Ventures Limited | Wholesale & retail | 2026 |
| Zephyr AI EDU Limited | Education | 2023 |
| Zepter Medical (UK) Ltd | Professional & scientific | 1995 |
| Zero Earth Limited | Wholesale & retail | 2025 |
| Zero Energy Ltd | Professional & scientific | 2011 |
| Zetek Solutions Limited | Administrative & support | 2023 |
| ZIA Cars Limited | Administrative & support | 2024 |
| ZIA Distributor Ltd | Wholesale & retail | 2021 |
| Zicom Limited | Wholesale & retail | 2025 |
| Zielone Drzewo Ltd | Transport & logistics | 2018 |
| ZIGI2020 Couriers Ltd | Other services | 2019 |
| Zignito Limited | Wholesale & retail | 2021 |
| ZIM & Co Consulting Limited | Professional & scientific | 2017 |
| Zimhaan Properties Ltd | Households | 2025 |
| Zinda Foods Limited | Manufacturing | 2012 |
| Zingnergy Ltd | Manufacturing | 2026 |
| Zinnia Thumbelina Ltd | Other services | 2022 |
| Zipit RUG Ltd | Wholesale & retail | 2024 |
| Zium Holdings Limited | Real estate | 2024 |
| ZJK Squash Academy Limited | Arts & recreation | 2015 |
| ZM Digital Marketing Limited | Wholesale & retail | 2023 |
| ZMK Investments Limited | Real estate | 2016 |
| ZNA Children Books Limited | Wholesale & retail | 2023 |
| ZNG Holdings Management Limited | Professional & scientific | 2026 |
| Zogolli Construction Limited | Construction | 2022 |
| Zoja Technologies Limited | Information & communication | 2022 |
| Zonalee Limited | Other services | 2017 |
| Zonda Ltd | Financial services | 2022 |
| Zoom Rides Limited | Transport & logistics | 2024 |
| Zorion Ltd | Real estate | 2013 |
| Zorsha Technologies Ltd | Information & communication | 2025 |
| Zotti Ltd | Wholesale & retail | 2019 |
| Zoyaa Aesthetics Ltd | Other services | 2025 |
| ZP Property Holdings Ltd | Real estate | 2026 |
| ZS Global Ventures Ltd | Wholesale & retail | 2026 |
| ZSV Limited | Financial services | 2025 |
| Zuban Trades Ltd | Construction | 2018 |
| Zucca Limited | Hospitality | 2022 |
| Zuditt AI Innovation Limited | Information & communication | 2025 |
| Zullufi Carwash Limited | Wholesale & retail | 2013 |
| ZUNKI3 Ltd | Manufacturing | 2025 |
| Zunnain Ltd | Wholesale & retail | 2025 |
| Zwipkart Ltd | Wholesale & retail | 2024 |
| Zyber Construction Ltd | Construction | 2009 |
| Zyber Financial Services Ltd | Administrative & support | 2025 |
| Zyber Ltd | Wholesale & retail | 2021 |
| Zyber Property Services Ltd | Real estate | 2018 |
| Zydro Drinks Ltd | Manufacturing | 2026 |
| Zyhen Ltd | Wholesale & retail | 2022 |
| Zyndra Retail Ltd | Wholesale & retail | 2026 |
| Zyvant Advisory PVT. Ltd. | Information & communication | 2020 |
| ZZP Holdings Limited | Financial services | 2021 |
| £PAY Ltd | Financial services | 2018 |