| Young Consulting Ltd | Professional & scientific | 2022 |
| Youngs Garage Limited | Administrative & support | 2003 |
| Your Pet Medicine Compare Ltd | Wholesale & retail | 2011 |
| Your Space Sevenoaks Ltd | Construction | 2021 |
| Yours Confidentially Limited | Professional & scientific | 1991 |
| Yplanit Ltd | Administrative & support | 2026 |
| YSF3 Limited | Real estate | 2025 |
| YSQ Ltd | Construction | 2016 |
| Yuchi & Skin Medical Clinic @ 15 Harley Street Limited | Health & social care | 2021 |
| Yuchi UK Consulting Limited | Information & communication | 2023 |
| YUM & Relish Limited | Hospitality | 2019 |
| ZA Education Group Ltd | Education | 2020 |
| Zambra Ltd | Real estate | 2021 |
| Zapp Commerce (UK) Ltd | Wholesale & retail | 2021 |
| Zapp Holding Limited | Financial services | 2021 |
| Zealoc Ltd | Other services | 2022 |
| Zebra Trading Limited | Real estate | 2003 |
| ZED Audio Solutions Ltd | Manufacturing | 2024 |
| Zenith Aircraft Limited | Transport & logistics | 2016 |
| Zenith Chester Limited | Real estate | 2012 |
| Zenith Freeholds (Whitstable) Limited | Administrative & support | 1999 |
| Zentrix Ltd | Professional & scientific | 2025 |
| Zepple Ltd | Professional & scientific | 2015 |
| Zepple Resources Ltd | Administrative & support | 2015 |
| Zilli Enterprises Ltd | Agriculture & fishing | 2024 |
| Zise Limited | Construction | 2011 |
| Zocra Limited | Real estate | 2001 |
| ZONE5 Advisory Limited | Professional & scientific | 2024 |
| Zones Property Ltd | Real estate | 2025 |
| Zousea Projects Limited | Construction | 2019 |
| Zukiwoo Enterprises Ltd | Information & communication | 2022 |
| ZYS Training Solutions Ltd | Professional & scientific | 2026 |
| Zyve Ltd | Financial services | 2025 |
| Ü Clinic Sevenoaks and Oxted Limited | Health & social care | 2025 |
| Ü Health and Wellness Ltd | Health & social care | 2021 |