| Zeevibe Limited | Wholesale & retail | 2024 |
| ZEF Concepts Ltd | Professional & scientific | 2010 |
| Zeller Consulting Limited | Professional & scientific | 2026 |
| ZEN Technology & Solutions Limited | Information & communication | 2022 |
| Zenoubia Limited | Professional & scientific | 2019 |
| Zero Emissions Vehicles Industries Ltd | Wholesale & retail | 2021 |
| Zero Rated Limited | Wholesale & retail | 2007 |
| Zero Two Twenty Limited | Professional & scientific | 2006 |
| Zetland Court (Richmond) Management Company Limited | Households | 2002 |
| Zetland Estates Limited | Construction | 1999 |
| Zeus Leasing Limited | Administrative & support | 2026 |
| Zewa Medicine Limited | Health & social care | 2022 |
| ZHU Property Estates Ltd | Real estate | 2022 |
| Zingari Art Deco Limited | Wholesale & retail | 2019 |
| Zingari Trading Limited | Wholesale & retail | 2021 |
| Zinnia Partners Ltd | Administrative & support | 2025 |
| Zita Elze Flowers Ltd | Wholesale & retail | 2003 |
| Zoid and Partners Limited | Professional & scientific | 2017 |
| Zonet Accounting Ltd | Professional & scientific | 2023 |
| Zoqq Holdings Ltd | Information & communication | 2025 |
| ZPB Limited | Professional & scientific | 2009 |
| Zukis Ltd | Professional & scientific | 2011 |
| Émilie Bridal Ltd | Wholesale & retail | 2022 |
| ÚNA Hayde Ltd | Professional & scientific | 2024 |