| Zalica Limited | Professional & scientific | 2025 |
| Zamed Business Group Ltd | Professional & scientific | 2020 |
| Zamzim Ltd | Real estate | 2023 |
| Zandava Properties Ltd | Hospitality | 2023 |
| Zanet Design Ltd | Information & communication | 2013 |
| Zani Properties Ltd | Real estate | 2022 |
| Zarahurst Limited | Households | 1972 |
| Zarkx Ltd | Information & communication | 2025 |
| Zaynaco Properties Limited | Administrative & support | 2023 |
| Zaza Cars Ltd | Transport & logistics | 2023 |
| Zaza Investments Ltd | Real estate | 2020 |
| ZAZA21 Limited | Hospitality | 2014 |
| Zdzirek Construction Ltd | Construction | 2020 |
| Zebiriosy Ltd | Wholesale & retail | 2025 |
| Zebra Bingo Ltd | Information & communication | 2025 |
| Zebrano Bespoke Building Services Limited | Construction | 2016 |
| ZED & Co Ltd | Manufacturing | 2008 |
| Zeeshan Traders Ltd | Wholesale & retail | 2026 |
| Zenden Sensory Spaces Ltd | Manufacturing | 2023 |
| Zenith Incorporation Ltd | Wholesale & retail | 2026 |
| Zenith Infinity Limited | Real estate | 2015 |
| Zenith Multilink Services Limited | Administrative & support | 2026 |
| Zenith Support Solutions Ltd | Professional & scientific | 2025 |
| Zennway Ltd | Professional & scientific | 2018 |
| Zephyrgold Ltd | Construction | 2025 |
| Zero Boundaries Limited | Education | 2025 |
| Zero Mile Pizza Bournemouth Ltd | Hospitality | 2025 |
| Zero One UK Ltd | Real estate | 2009 |
| Zero Waste Mindset Ltd | Professional & scientific | 2019 |
| Zero X Ninety Limited | Financial services | 2020 |
| Zero Zero 2 Ltd | Wholesale & retail | 2024 |
| Zest Group Holding Limited | Financial services | 2025 |
| Zest Group Limited | Financial services | 2009 |
| Zestie the Agency Ltd | Professional & scientific | 2024 |
| Zetcare Ltd | Transport & logistics | 2019 |
| Zeyten Ltd | Hospitality | 2024 |
| ZG Electrical Ltd | Construction | 2017 |
| Zhang Property Investment Services (UK) Limited | Real estate | 2014 |
| Zigency Limited | Other services | 2025 |
| Zinariya Groups Ltd | Wholesale & retail | 2025 |
| Zippycabs Ltd | Transport & logistics | 2026 |
| Zipzap Bournemouth Christchurch and Poole Ltd | Health & social care | 2024 |
| Zizi Transport Ltd | Transport & logistics | 2019 |
| ZJK Carpentry Limited | Construction | 2025 |
| Zlim Ltd | Real estate | 2024 |
| Zoetrope Research Limited | Professional & scientific | 2014 |
| Zolo Management Services Limited | Administrative & support | 2010 |
| ZOM Investments Ltd | Professional & scientific | 2023 |
| Zone 2 Electrical Limited | Energy | 2013 |
| Zone in Music Entertainment Ltd | Arts & recreation | 2024 |
| ZSP Catering Limited | Hospitality | 2023 |
| Zsuzsahealthcare Ltd | Health & social care | 2017 |
| ZVM Ltd | Information & communication | 2016 |
| Zybus Limited | Manufacturing | 2022 |
| Zynlix Ltd | Information & communication | 2025 |
| ZZZ AA Limited | Construction | 2007 |
| Èlan Prestige Concierge Ltd | Transport & logistics | 2026 |
| Época Mezcal Ltd | Wholesale & retail | 2021 |