| Youth Transitioning Support Ltd | Health & social care | 2022 |
| Youthful Skin Aesthetics Ltd | Other services | 2025 |
| Youthtopia Skin Aesthetics Limited | Other services | 2022 |
| Yoxford Property Ltd | Real estate | 2025 |
| YR Consulting Ltd | Information & communication | 2015 |
| YSM Pipework Solutions Ltd | Construction | 2024 |
| YSM Property Solutions Ltd | Real estate | 2026 |
| YSM Solutions Group Ltd | Financial services | 2025 |
| Yummy Food & Snacks Ltd | Hospitality | 2026 |
| YVI Drylining Ltd | Construction | 2023 |
| Yzee Limited | Construction | 2010 |
| Z Union Ltd | Transport & logistics | 2016 |
| Z2A Marketing Ltd | Professional & scientific | 2026 |
| Zabik Trans Ltd | Transport & logistics | 2019 |
| Zach Henry Group Ltd | Administrative & support | 2020 |
| Zachary Warman Brands Limited | Wholesale & retail | 2025 |
| Zafonic Design Limited | Construction | 2011 |
| Zaika Basildon Ltd | Hospitality | 2025 |
| Zaika Indian Take Away Limited | Hospitality | 2022 |
| Zaika Supermarket Ltd | Hospitality | 2025 |
| Zangeli Limited | Wholesale & retail | 2024 |
| Zara Homes Limited | Real estate | 2025 |
| Zaradera Ltd | Wholesale & retail | 2026 |
| Zarajane Interiors Limited | Professional & scientific | 2016 |
| Zariko Ltd | Wholesale & retail | 2026 |
| Zaro Investment Ltd | Real estate | 2025 |
| Zatola Limited | Health & social care | 2010 |
| Zavvinko Ltd | Wholesale & retail | 2018 |
| ZE Property Group Limited | Construction | 2021 |
| Zebstone Ltd | Professional & scientific | 2017 |
| Zelek Ltd | Wholesale & retail | 2015 |
| Zenera Limited | Information & communication | 2025 |
| Zeno Wholesale Limited | Wholesale & retail | 2026 |
| Zensoma Studio Limited | Arts & recreation | 2025 |
| Zephira Deen Limited | Health & social care | 2015 |
| Zera Idea Ltd | Professional & scientific | 2025 |
| ZET Electrical Ltd | Construction | 2018 |
| Zetec Services Limited | Administrative & support | 2021 |
| ZG Cleaning Ltd | Administrative & support | 2025 |
| ZI Property Limited | Real estate | 2025 |
| Ziggy Flooring Ltd | Construction | 2017 |
| Zigo-Lince Ltd | Health & social care | 2016 |
| ZIK Global Enterprise Limited | Wholesale & retail | 2026 |
| Zikhali Ltd | Administrative & support | 2020 |
| ZIN & Zelal Ltd | Wholesale & retail | 2022 |
| ZIN Best Pitta Limited | Hospitality | 2023 |
| Zing Client Management Limited | Professional & scientific | 2016 |
| Zinlea Health Limited | Professional & scientific | 2025 |
| Zion Concept Limited | Administrative & support | 2010 |
| Zirnax Ltd | Hospitality | 2017 |
| ZIZ Logistics Ltd | Transport & logistics | 2022 |
| ZKB Holdings Ltd | Financial services | 2021 |
| ZLS Design Ltd | Professional & scientific | 2019 |
| ZM Transports Ltd | Transport & logistics | 2019 |
| Zoe-Sonos Ltd | Health & social care | 2024 |
| ZOL Ltd | Administrative & support | 2014 |
| Zone 1 Plumbing Ltd | Construction | 2025 |
| Zryan Limited | Hospitality | 2018 |
| Zsdaniel Limited | Transport & logistics | 2017 |
| Zubies Integrated Resource Limited | Construction | 2016 |
| Zulu Investments Limited | Other services | 2013 |
| Zulu Tattoo UK Ltd | Arts & recreation | 2020 |
| Zuvva Homes Ltd | Construction | 2025 |
| ZW CP Services Limited | Administrative & support | 2025 |