| Yoginlav Ltd | Arts & recreation | 2024 |
| Yorooms Properties Limited | Real estate | 2021 |
| Yova Limited | Professional & scientific | 2025 |
| YRT Residential Limited | Real estate | 2018 |
| YS Mini Market Ltd | Administrative & support | 2018 |
| YSM Real Estate Limited | Real estate | 2018 |
| Yumox Holding Limited | Financial services | 2026 |
| YUN Limited | Financial services | 2002 |
| Yunasko Limited | Administrative & support | 2010 |
| Z & X Consultancy Ltd | Professional & scientific | 2017 |
| Zabrina Training Limited | Administrative & support | 2006 |
| Zafeiria Mavrogiannidou Limited | Health & social care | 2024 |
| ZAP Executive Coaching Limited | Professional & scientific | 2018 |
| Zaptap Limited | Construction | 2020 |
| Zaria Property Investments Limited | Administrative & support | 2005 |
| Zarin Investment Ltd | Financial services | 2019 |
| Zatoria Limited | Real estate | 2025 |
| ZC Consultant Ltd | Information & communication | 2026 |
| Zedcraft Investments Limited | Financial services | 2018 |
| Zedcraft Limited | Real estate | 1992 |
| Zenan Group Ltd | Financial services | 2025 |
| Zenan Properties Ltd | Construction | 2019 |
| Zepto PVT Ltd | Wholesale & retail | 2025 |
| Zero Film Productions Ltd | Information & communication | 2011 |
| Zeus Defence Solutions Limited | Information & communication | 2019 |
| Zeus International Holdings Limited | Manufacturing | 2021 |
| Zeus UAV Ltd | Professional & scientific | 2017 |
| Zezzy Limited | Wholesale & retail | 2019 |
| Zezzy London Limited | Wholesale & retail | 2023 |
| Zhimeiren Ltd | Wholesale & retail | 2025 |
| Zimtech Building Maintenance Ltd | Administrative & support | 2016 |
| Zinc London Ltd | Wholesale & retail | 2017 |
| Zipp Communications (UK) Ltd | Information & communication | 2014 |
| Zone Property Management Limited | Real estate | 2019 |
| Zoto Construction Ltd | Construction | 2026 |
| ZPT Investments Ltd | Real estate | 2024 |
| Zumizumi Limited | Wholesale & retail | 2024 |
| Zumond Ltd | Wholesale & retail | 2017 |
| Zuza Ltd | Administrative & support | 2021 |