| Youngaesthetics Ltd | Health & social care | 2010 |
| Your Gadgets Covered Ltd | Financial services | 2021 |
| Your Gardening MAN Limited | Other services | 2014 |
| Your IT Limited | Information & communication | 1998 |
| Your Remote PA (Admin Services) Ltd | Administrative & support | 2021 |
| Z Space UK Consultancy Limited | Professional & scientific | 2016 |
| ZAP Consult Ltd | Professional & scientific | 2025 |
| Zapatos Designer Shoes Ltd | Wholesale & retail | 2005 |
| ZC Enterprises Limited | Arts & recreation | 2020 |
| Zedra Corporate and Private Office (UK) Limited | Financial services | 2016 |
| Zedra Fiduciary Services (UK) Limited | Financial services | 1989 |
| Zedra Holdings UK Limited | Financial services | 2016 |
| Zedra Legal Services (UK) Limited | Professional & scientific | 2021 |
| Zedra Property Services (UK) Limited | Real estate | 2017 |
| Zedra Trust Company (UK) Limited | Financial services | 1967 |
| Zedra UK Services Limited | Professional & scientific | 2015 |
| Zelus Software Ltd | Information & communication | 2026 |
| Zensumi Ltd | Information & communication | 2011 |
| ZH Medical Services Ltd. | Health & social care | 2016 |
| Zijlmans Holdings Limited | Financial services | 2025 |
| Zobbworks Limited | Wholesale & retail | 2005 |
| ZOE Paul Ltd | Health & social care | 2026 |
| Zoek Applications Limited | Administrative & support | 2010 |
| Zuva Holdings Limited | Real estate | 2020 |