| Z.65 Vision Collaborative Limited | Professional & scientific | 2023 |
| Zafer Cetinel Properties Limited | Real estate | 2021 |
| ZAK Renewables Ltd | Extraterritorial | 2016 |
| Zalando UK Ltd. | Wholesale & retail | 2022 |
| Zano CUT Ltd | Other services | 2025 |
| ZAS Search Limited | Administrative & support | 2016 |
| Zayds Phones Ltd | Wholesale & retail | 2020 |
| Zaytounica Ltd | Wholesale & retail | 2025 |
| Zealandia Services Limited | Energy | 2013 |
| Zebedee Properties Ltd | Real estate | 2022 |
| Zebra Investments Limited | Real estate | 2001 |
| Zelmax Limited | Real estate | 2011 |
| ZEN Residency Ltd | Real estate | 2023 |
| Zenbala Fitness Limited | Arts & recreation | 2022 |
| Zenith Accountancy Solutions Limited | Information & communication | 2024 |
| Zenmore Limited | Manufacturing | 2021 |
| Zepler Consulting Limited | Professional & scientific | 2014 |
| Zerbetto Transport Ltd | Transport & logistics | 2022 |
| Zero Gravity Consultancy Ltd | Professional & scientific | 2019 |
| Zero Harm Consulting Limited | Health & social care | 2020 |
| Zero Hour Ltd | Education | 2020 |
| Zero Paints (UK) Limited | Wholesale & retail | 2014 |
| Zest Construction Limited | Construction | 2021 |
| Zest Intelligence Limited | Professional & scientific | 2023 |
| Zest Personal Development Ltd | Extraterritorial | 2017 |
| ZEST24 Ltd | Arts & recreation | 2019 |
| Zesta Planning Ltd | Professional & scientific | 2018 |
| ZG Publishing Ltd | Information & communication | 2010 |
| Ziff Consulting Limited | Other services | 2010 |
| Ziggurat Designs Limited | Extraterritorial | 2003 |
| Zilant Ltd | Extraterritorial | 2024 |
| Zimbolic Art UK Limited | Wholesale & retail | 2018 |
| Zinnia Care Services Limited | Administrative & support | 2024 |
| Zion Internet Services Limited | Information & communication | 2023 |
| Zion Supported Living Limited | Hospitality | 2024 |
| Zlinvest Limited | Manufacturing | 2017 |
| Zonda Pizza (Halfway) Ltd | Hospitality | 2026 |
| Zone Safety Training Limited | Education | 2013 |
| Zonemerge Residents Management Limited | Hospitality | 1986 |
| Zoom Photography Limited | Professional & scientific | 2020 |
| Zoro Cards Ltd | Wholesale & retail | 2025 |
| Zorrox Consulting Limited | Information & communication | 2013 |
| ZR Ventures Ltd | Wholesale & retail | 2024 |
| Zrodelko Delikatesy Ltd | Wholesale & retail | 2017 |
| Zrodelko Food Ltd | Wholesale & retail | 2023 |
| ZSL Developments Limited | Real estate | 2020 |
| Zuku Ltd | Wholesale & retail | 2020 |
| Zygmat Limited | Transport & logistics | 2013 |
| Zylo Developments Ltd | Construction | 2021 |
| Zyphora Commerce Ltd | Wholesale & retail | 2026 |
| Æffect Dynamics Advisory Group Ltd. | Professional & scientific | 2026 |