| Zeefx Limited | Arts & recreation | 2019 |
| Zehuti Limited | Information & communication | 2001 |
| Zeke Creative Limited | Professional & scientific | 2012 |
| ZEN Experiential Limited | Wholesale & retail | 2012 |
| ZEN Wealth LLP | | 2012 |
| Zeness Ltd | Arts & recreation | 2025 |
| Zenith Bookkeeping Limited | Professional & scientific | 2013 |
| Zenith Global Limited | Professional & scientific | 1991 |
| Zenwise Limited | Financial services | 2019 |
| Zephyr Water Treatment Services Limited | Administrative & support | 1985 |
| Zephyrus Digital Limited | Wholesale & retail | 1962 |
| Zero Emission Buildings Ltd | Professional & scientific | 2024 |
| Zero VAT LLP | | 2011 |
| Zest Property Services Group Ltd | Financial services | 2020 |
| Zest Property Services Ltd | Real estate | 2008 |
| Zeyro Limited | Financial services | 2022 |
| Zhengtong Limited | Hospitality | 2024 |
| ZIG ZAG Accountants & Business Advisers Limited | Professional & scientific | 2015 |
| Zille Media Ltd | Information & communication | 2020 |
| Zillioner Club Ltd | Wholesale & retail | 2023 |
| Zivaro Ltd | Real estate | 2026 |
| ZJP Ventures Ltd | Administrative & support | 2026 |
| ZJR Security Ltd | Administrative & support | 2025 |
| ZKJ Design Limited | Professional & scientific | 2013 |
| Zoby AI Ltd | Information & communication | 2023 |
| Zodiac Wellness LAB Limited | Manufacturing | 2024 |
| ZOE 247 Solutions Ltd | Administrative & support | 2022 |
| ZOK Foods Ltd | Hospitality | 2025 |
| Zonkey Solutions Ltd | Information & communication | 2010 |
| Zoom Cars Limited | Transport & logistics | 2020 |
| Zoom Xpress Ltd | Other services | 2014 |
| Zoostock Limited | Information & communication | 2019 |
| Zorba Management Ltd | Real estate | 2025 |
| Zorba Properties Development Ltd | Real estate | 2017 |
| Zosia Limited | Wholesale & retail | 2022 |
| Zovu Sustainable Development Foundation Limited | Other services | 2022 |
| Zureus Limited | Information & communication | 2008 |
| Zusa Studio Ltd | Professional & scientific | 2020 |
| Zymbian Holdings Limited | Financial services | 2021 |
| Zymbian Limited | Information & communication | 2007 |