| Young Flooring Solutions Limited | Construction | 2018 |
| Your Dream Dresses Limited | Wholesale & retail | 2018 |
| Your Window Cleaner Ltd | Administrative & support | 2018 |
| Youth Minded Limited | Education | 2001 |
| Youth Options | Education | 1996 |
| Youth Options Centres Limited | Arts & recreation | 1994 |
| Yudees Limited | Administrative & support | 2026 |
| YUM Street Ltd | Hospitality | 2021 |
| Yummy Yummy (Eastleigh) Ltd | Hospitality | 2026 |
| Zackchug Ltd | Professional & scientific | 2022 |
| Zaethra Ltd | Information & communication | 2026 |
| Zakrans Investments Ltd | Real estate | 2018 |
| Zamin Holdings Ltd | Financial services | 2015 |
| Zamin Investment Ltd | Professional & scientific | 2022 |
| ZD Design and Print Ltd | Manufacturing | 2024 |
| Zealey Consulting Ltd | Professional & scientific | 2025 |
| Zealous Media Limited | Information & communication | 2014 |
| ZED Express Ltd | Transport & logistics | 2020 |
| ZEN Homes Development Ltd | Real estate | 2016 |
| Zenbay Ltd | Health & social care | 2025 |
| Zenki Space Limited | Other services | 2021 |
| Zensushi 1 Ltd | Hospitality | 2025 |
| Zeroed-In Fire & Security (ZFS) Ltd | Administrative & support | 2025 |
| Zest Boatworks Limited | Manufacturing | 2015 |
| Zest Consultancy Limited | Professional & scientific | 2011 |
| Zeun Neurology Ltd | Health & social care | 2025 |
| ZF Precision Ltd | Manufacturing | 2024 |
| ZHC Limited | Health & social care | 2026 |
| Zimmer Audio Production Ltd | Information & communication | 2017 |
| Zippy Ltd | Transport & logistics | 2025 |
| Zobisco Ltd | Manufacturing | 2026 |
| Zoodotcom Ltd | Professional & scientific | 2008 |
| Zoran Properties Ltd | Real estate | 2023 |
| Zorba's & Leonardo's Limited | Hospitality | 1998 |
| Zorbun Ltd | Wholesale & retail | 2024 |
| Zuraiz Ltd | Wholesale & retail | 2025 |