| Zaitun Indian Take Away Limited | Hospitality | 2016 |
| ZAK Consulting Ltd | Wholesale & retail | 2025 |
| Zakaria Properties Ltd | Real estate | 2022 |
| Zakir Hossain Ltd | Professional & scientific | 2006 |
| Zaks Properties Ltd | Real estate | 2019 |
| Zaman Ventures Ltd | Education | 2022 |
| Zane & Laura Inc Ltd | Manufacturing | 2017 |
| ZAP Clothing Limited | Wholesale & retail | 1986 |
| Zaral Ltd | Wholesale & retail | 2025 |
| Zaremba TT Ltd | Construction | 2024 |
| Zarms Hair and Beauty Ltd | Other services | 2018 |
| Zaryal Ltd | Wholesale & retail | 2025 |
| Zask Properties Limited | Real estate | 2020 |
| Zawar Edge Limited | Wholesale & retail | 2026 |
| Zaynova Ltd | Wholesale & retail | 2025 |
| Zaza Futures Limited | Education | 2025 |
| Zbruch Team Ltd | Construction | 2011 |
| ZD Accounts Ltd | Professional & scientific | 2018 |
| Zeda Tech Ltd | Information & communication | 2025 |
| Zeedarm Consulting Limited | Professional & scientific | 2023 |
| Zeeshan Pro Ltd | Wholesale & retail | 2025 |
| Zeewolf Enterprises Limited | | 1986 |
| Zefasto Ltd | Wholesale & retail | 2026 |
| ZEI Properties Ltd | Real estate | 2021 |
| ZEN Checkout Ltd | Wholesale & retail | 2025 |
| Zenith Consultancy Services Limited | Information & communication | 1992 |
| Zenithbond Limited | Households | 1981 |
| Zenox IT Ltd | Information & communication | 2025 |
| Zentrade Retail Ltd | Wholesale & retail | 2026 |
| Zentrex Limited | Professional & scientific | 2003 |
| Zentric Limited | Real estate | 2003 |
| Zentro Prime Ltd | Wholesale & retail | 2026 |
| Zephyrspring Limited | Manufacturing | 1981 |
| ZER Fish & Chips Ltd | Hospitality | 2024 |
| Zerconia Ltd | Construction | 2015 |
| Zero Tolerance Limited | Administrative & support | 1996 |
| Zerra Group Ltd | Information & communication | 2025 |
| Zeteo Legal Ltd | Professional & scientific | 2025 |
| Zfag Holdings Ltd | Financial services | 2025 |
| Zfap Holdings Ltd | Financial services | 2025 |
| Zhangtingmei Ltd | Wholesale & retail | 2021 |
| Zienachi Limited | Other services | 2024 |
| Zikosa Enterprise Limited | Transport & logistics | 2006 |
| Zilan Barber Ltd | Administrative & support | 2017 |
| Zillow Digital Ltd | Information & communication | 2025 |
| Zimaica Limited | Information & communication | 2006 |
| Zinsights Accounting & Consultancy Ltd | Professional & scientific | 2023 |
| Zipbuy Ltd | Wholesale & retail | 2026 |
| Ziper Ltd | Wholesale & retail | 2026 |
| Zirconium Properties Ltd | Real estate | 2026 |
| Ziva Ltd | Professional & scientific | 2016 |
| Zivoraglow Ltd | Wholesale & retail | 2026 |
| Ziya Group Ltd | Information & communication | 2025 |
| Ziya Solutions Ltd | Information & communication | 2026 |
| ZOE Manning Drawing Services Limited | Professional & scientific | 2003 |
| Zohan Ltd | Wholesale & retail | 2026 |
| Zola Food Services Limited | Manufacturing | 2006 |
| Zone D Management Company (Great Dunmow) Limited | Real estate | 1985 |
| Zoopa Limited | Hospitality | 2017 |
| Zoydex Ltd | Wholesale & retail | 2025 |
| ZS Computers Ltd | Other services | 2014 |
| Zucci Limited | Hospitality | 2017 |
| Zuni.Int Traders Limited | Wholesale & retail | 2025 |
| Zurnir Global Services Ltd | Administrative & support | 2024 |
| Zydeco Developments Limited | Administrative & support | 1999 |
| ZYM Investment Limited | Real estate | 2020 |
| Zynetra Ltd | Wholesale & retail | 2026 |
| Zyphorium Limited | Professional & scientific | 2024 |
| Zyro Shop Ltd | Wholesale & retail | 2026 |
| “Neigh”Omi’S Equine Transport and Hire Ltd | Transport & logistics | 2018 |