| Zaitoon Kurdstan Limited | Hospitality | 2025 |
| ZAK Home Care Services Ltd | Health & social care | 2025 |
| ZAK Property Management Ltd | Real estate | 2025 |
| ZAK Stores 2 Ltd | Wholesale & retail | 2022 |
| ZAK Stores 3 Ltd | Wholesale & retail | 2024 |
| ZAK Stores Limited | Wholesale & retail | 2017 |
| Zakery Khub Solicitors Ltd | Professional & scientific | 2018 |
| Zaks Advisory Ltd | Health & social care | 2012 |
| Zaksson Ltd | Wholesale & retail | 2018 |
| Zalewski and SON Ltd | Construction | 2022 |
| Zaly Distribution UK Ltd | Wholesale & retail | 2023 |
| Zama Properties Limited | Real estate | 2021 |
| Zambezi Spares Limited | Wholesale & retail | 2025 |
| Zameer Private Hire Ltd | Transport & logistics | 2026 |
| Zamh (UK) Trading Limited | Wholesale & retail | 2025 |
| Zamya Limited | Professional & scientific | 2008 |
| Zamzam Bakery Mini Market Ltd | Manufacturing | 2024 |
| Zamzam CARE24-7 Ltd | Health & social care | 2022 |
| Zana Transport Limited | Transport & logistics | 2019 |
| Zaneks Limited | Wholesale & retail | 2024 |
| Zaneta Limited | Transport & logistics | 2025 |
| Zangi Motors Limited | Wholesale & retail | 2018 |
| Zanogen (UK) Limited | Extraterritorial | 2012 |
| Zansker Ltd | Health & social care | 2023 |
| Zaonmart Ltd | Wholesale & retail | 2021 |
| Zapiekanka AG Ltd | Hospitality | 2024 |
| Zapp Healthcare Limited | Real estate | 2012 |
| Zaqurate Ltd | Health & social care | 2024 |
| Zara Care 786 Limited | Health & social care | 2018 |
| Zarhass Limited | Administrative & support | 2021 |
| Zari Travels Ltd | Transport & logistics | 2025 |
| Zaria Creative Media Ltd | Information & communication | 2020 |
| Zarla Emart Limited | Wholesale & retail | 2025 |
| Zarqe Ltd | Wholesale & retail | 2025 |
| Zarvon Trading Limited | Wholesale & retail | 2026 |
| Zasun Ltd | Extraterritorial | 1964 |
| Zauna Limited | Extraterritorial | 2023 |
| Zaviyar Store Limited | Wholesale & retail | 2025 |
| Zavod Studio UK Ltd | Professional & scientific | 2022 |
| Zawadi Ltd | Hospitality | 2024 |
| Zaya Global Digital Ltd | Wholesale & retail | 2025 |
| Zayn Autos Limited | Wholesale & retail | 2019 |
| Zaza 23 Ltd | Other services | 2024 |
| Zaza's Hand Carwash & Valeting Ltd | Administrative & support | 2025 |
| ZB Estates (Yorkshire) Ltd | Real estate | 2026 |
| ZB Plumbing & GAS Services Limited | Construction | 2024 |
| ZBA Specialists Ltd | Information & communication | 2026 |
| ZD Resources Ltd | Health & social care | 2022 |
| ZDM Holdings | Professional & scientific | 2024 |
| ZDM Investments | Professional & scientific | 2023 |
| ZDM Property Limited | Professional & scientific | 2023 |
| ZDM Ventures Limited | Professional & scientific | 2024 |
| ZE Caravan Limited | Wholesale & retail | 2023 |
| ZE ZE Food Ltd | Wholesale & retail | 2026 |
| Zebedee Collective Ltd | Financial services | 2023 |
| Zebedee Residential Limited | Real estate | 2023 |
| Zebedee Studios Ltd | Real estate | 2021 |
| Zebedee Talent Ltd | Arts & recreation | 2018 |
| Zebra Court Limited | Real estate | 2021 |
| Zebu Steak House Ltd | Hospitality | 2026 |
| Zection Group Ltd | Real estate | 2026 |
| Zeds Wholefoods Ltd | Wholesale & retail | 2021 |
| Zedstar Limited | | 1988 |
| Zedtasty Limited | Administrative & support | 2023 |
| ZEE Consulting Limited | Information & communication | 2024 |
| ZEE ERA Ltd | Wholesale & retail | 2022 |
| ZEE Khan Ltd | Transport & logistics | 2018 |
| Zeeecomuae Ltd | Wholesale & retail | 2025 |
| Zeelou Ltd | Information & communication | 2026 |
| Zefis Inn Limited | Hospitality | 2019 |
| ZEL Marketing Ltd | Professional & scientific | 2026 |
| Zel-Zey Ltd | Hospitality | 2023 |
| Zelle Plus Ltd | Wholesale & retail | 2023 |
| Zelta Ltd | Professional & scientific | 2026 |
| Zeltro Ltd | Professional & scientific | 2025 |
| Zemoura Ltd | Professional & scientific | 2017 |
| ZEN Arena Limited | Extraterritorial | 2015 |
| ZEN Asset Management Limited | Arts & recreation | 2007 |
| ZEN Beauty Room Ltd | Health & social care | 2020 |
| ZEN Beauty Z&Z Ltd | Health & social care | 2025 |
| ZEN Corporation Limited | Manufacturing | 1996 |
| ZEN Gifts Limited | Wholesale & retail | 2010 |
| ZEN Golf Corporation Limited | Arts & recreation | 2011 |
| ZEN Golf Limited | Extraterritorial | 2007 |
| ZEN Golf Mechanics Limited | Education | 2010 |
| ZEN Green Stage Limited | Manufacturing | 2001 |
| ZEN Oracle Limited | Manufacturing | 2017 |
| ZEN Services Ltd | Information & communication | 2006 |
| ZEN Stadium Holdings Limited | Extraterritorial | 2015 |
| Zenab Jahangir Properties Limited | Real estate | 2025 |
| Zenavora Limited | Wholesale & retail | 2026 |
| Zencard Limited | Information & communication | 2017 |
| Zenith Healthcare Consultancy Limited | Professional & scientific | 2024 |
| Zenith Sales Academy Ltd | Wholesale & retail | 2026 |
| Zenith Solicitor Ltd | Professional & scientific | 2016 |
| Zenith Support Limited | Health & social care | 2023 |
| Zenithfusion Limited | Wholesale & retail | 2025 |
| Zenlham Limited | Other services | 2021 |
| Zenluce Limited | Administrative & support | 2026 |
| Zennd Ltd | Wholesale & retail | 2025 |