| Zest Allied Health Professionals Limited | Health & social care | 2018 |
| Zeustransport Ltd | Transport & logistics | 2025 |
| ZG Food Ltd | Other services | 2023 |
| ZHQ Coastal Kitchen Ltd | Hospitality | 2026 |
| Zianluxe Ltd | Wholesale & retail | 2024 |
| Zigante Limited | Other services | 2022 |
| Zikbah Limited | Wholesale & retail | 2024 |
| ZIM Domi Construction Limited | Construction | 2022 |
| Zimmer Biomet UK Limited | Wholesale & retail | 1962 |
| Zimmer Trustees Limited | Other services | 1970 |
| Zinc White Ltd | Manufacturing | 2013 |
| Zing Homes Limited | Real estate | 2013 |
| Zintracom Limited | Extraterritorial | 1999 |
| Zion Legacy Property Development Ltd | Real estate | 2021 |
| Ziplusa Ltd | Transport & logistics | 2025 |
| Zizi Smile Limited | Health & social care | 2007 |
| Zizusoft Ltd | Information & communication | 2018 |
| ZJ45 Ltd | Wholesale & retail | 2026 |
| ZKI Catering Limited | Hospitality | 2026 |
| ZMV Ltd | Wholesale & retail | 2025 |
| Zmzm UK Limited | Hospitality | 2018 |
| Zoantarius Limited | Other services | 2026 |
| ZOE Ridgway Consulting Limited | Health & social care | 2014 |
| Zoe-Life International (UK) Ltd | Wholesale & retail | 2021 |
| Zone Testing Services Limited | Information & communication | 2014 |
| Zoneh Limited | Real estate | 2022 |
| Zonend Limited | Professional & scientific | 2023 |
| Zonl Limited | Professional & scientific | 2024 |
| Zorrah Property Investment Ltd | Real estate | 2023 |
| Zosia Properties Limited | Real estate | 2025 |
| Zoweh Ltd | Information & communication | 2023 |
| Zpos Ltd | Information & communication | 2013 |
| Zproject Limited | Professional & scientific | 2016 |
| ZS Engineering Ltd | Manufacturing | 2025 |
| ZSS Creations Ltd | Wholesale & retail | 2019 |
| Zsuccess Ltd | Hospitality | 2025 |
| Zubbyzhair Limited | Other services | 2024 |
| Zubkaa Ltd | Real estate | 2022 |
| Zuchi Limited | Wholesale & retail | 2024 |
| Zumram Limited | Hospitality | 2023 |
| Zurich Advice Network Limited | Financial services | 1951 |
| Zurich Assurance Ltd | Financial services | 1990 |
| Zurich CM UK Limited | Financial services | 2026 |
| Zurich Community Trust (UK) Limited | Other services | 1973 |
| Zurich Corporate Member UK Limited | Financial services | 2026 |
| Zurich Corporate Secretary (UK) Limited | Extraterritorial | 1979 |
| Zurich Employment Services Limited | Administrative & support | 1929 |
| Zurich Finance (UK) PLC | Financial services | 2002 |
| Zurich Financial Services (Ukisa) Limited | Professional & scientific | 1984 |
| Zurich Financial Services (Ukisa) Nominees Limited | Extraterritorial | 1997 |
| Zurich Financial Services UK Pension Trustee Limited | Extraterritorial | 1993 |
| Zurich Global Specialty Limited | Financial services | 2026 |
| Zurich Intermediary Group Limited | Financial services | 1985 |
| Zurich Pension Trustees Limited | Financial services | 1944 |
| Zurich Pensions Management Limited | Financial services | 2001 |
| Zurich Project Finance (UK) Limited | Financial services | 2014 |
| Zurich Transitional Services Limited | Administrative & support | 2001 |
| ZVH (UK) Ltd | Wholesale & retail | 2024 |
| Zwane Care Limited | Health & social care | 2018 |
| ZYPD0201 Limited | Health & social care | 2022 |