| ZAR Transport Ltd | Transport & logistics | 2023 |
| Zarepath Limited | Health & social care | 2016 |
| Zarli Media Limited | Professional & scientific | 2025 |
| Zaro Trading Limited | Wholesale & retail | 2018 |
| Zarsol Limited | Transport & logistics | 2019 |
| ZAS Accounting Limited | Professional & scientific | 2017 |
| ZAS Care Ltd | Health & social care | 2026 |
| ZAS Consulting Limited | Professional & scientific | 2008 |
| Zaubermaus Limited | Real estate | 2017 |
| Zaviyan Traders Ltd | Wholesale & retail | 2025 |
| Zaya Medical Group Limited | Health & social care | 2019 |
| Zayn Holdings Ltd | Financial services | 2022 |
| Zayns Organization Ltd | Financial services | 2025 |
| Zbafixes Ltd | Wholesale & retail | 2024 |
| Zbarda Limited | Construction | 2014 |
| ZBC Property Partners Ltd | Real estate | 2025 |
| ZCJ Consulting Ltd | Professional & scientific | 2023 |
| ZD Brickwork Ltd | Construction | 2018 |
| ZD Construction Management Ltd | Construction | 2018 |
| Zdeb Invest Ltd | Real estate | 2020 |
| ZE Grange Park Ltd | Hospitality | 2023 |
| ZEB Haulage Limited | Transport & logistics | 2025 |
| Zebra Gate Property Limited | Real estate | 2024 |
| Zeco Travels Ltd | Administrative & support | 2024 |
| Zedex Consultants Limited | Information & communication | 1997 |
| Zeegold Business Solutions Ltd | Administrative & support | 2015 |
| Zeenungos Limited | Health & social care | 2025 |
| Zeffer Ltd | Information & communication | 2022 |
| Zefi Restaurant Ltd | Hospitality | 2020 |
| Zehri Homes LLP | | 2018 |
| Zehri Limited | Real estate | 2018 |
| Zekers Ltd | Real estate | 2025 |
| Zeki Developments Ltd | Construction | 2018 |
| Zekrem Technology Ltd | Wholesale & retail | 2020 |
| Zelin Limited | Real estate | 1999 |
| Zellar Holdings Limited | Financial services | 2020 |
| Zellar Ltd | Information & communication | 2016 |
| Zelus Delivery Ltd | Transport & logistics | 2021 |
| Zelus Mortgage and Finance Ltd | Financial services | 2021 |
| Zemmaks Construction Limited | Construction | 2018 |
| Zemtex (UK) Limited | Professional & scientific | 2003 |
| ZEN Business Consultants Ltd | Wholesale & retail | 2023 |
| ZEN Equity Ltd | Real estate | 2024 |
| ZEN Health Ltd | Health & social care | 2023 |
| ZEN Holding 1 Ltd | Real estate | 2024 |
| ZEN Lettings Ltd | Real estate | 2019 |
| ZEN Mngmt Ltd | Real estate | 2025 |
| ZEN Mobile Repair Ltd | Other services | 2019 |
| ZEN Propco. Ltd | Real estate | 2024 |
| ZEN Retreat Properties Ltd | Real estate | 2025 |
| Zenbit Tech Ltd | Information & communication | 2020 |
| Zenbiz Limited | Hospitality | 2011 |
| Zenclay Living Ltd | Real estate | 2024 |
| Zenclay Propco Ltd | Real estate | 2025 |
| Zendeli Ltd | Hospitality | 2024 |
| Zenit International Limited | Wholesale & retail | 2025 |
| Zenith Immigration Lawyers Ltd | Information & communication | 2017 |
| Zenith Luxury Homes Limited | Real estate | 2024 |
| Zenith Realms Ltd | Real estate | 2019 |
| Zenith Zinc Ltd | Construction | 2017 |
| Zenity Co Ltd | Wholesale & retail | 2024 |
| Zenmeds Pharma Limited | Wholesale & retail | 2025 |
| Zenna Health and Wellbeing Ltd | Health & social care | 2024 |
| Zennith Care Limited | Administrative & support | 2022 |
| Zentier Ltd | Administrative & support | 2026 |
| Zentralite Ltd | Wholesale & retail | 2011 |
| Zero Carbon Emissions Ltd | Construction | 2020 |
| Zero Issues Ltd | Wholesale & retail | 2025 |
| Zerona Trans Limited | Transport & logistics | 2026 |
| Zeropixel Holdings Ltd | Financial services | 2025 |
| Zest IT Solutions Ltd | Other services | 2010 |
| Zest Kitchens Northampton Limited | Construction | 2018 |
| Zest Marquees Ltd | Administrative & support | 2022 |
| Zestcode Digital Limited | Information & communication | 2019 |
| Zestcode Holdings Limited | Financial services | 2023 |
| Zetka POL Ltd | Transport & logistics | 2015 |
| Zeus Electrical Contractors Ltd | Construction | 2021 |
| Zeus Taxi Ltd | Transport & logistics | 2025 |
| Zgrange Ltd | Hospitality | 2024 |
| Zhuzh Home Ltd | Wholesale & retail | 2021 |
| Zicsom Ltd | Transport & logistics | 2023 |
| Zidan Ventures Ltd | Wholesale & retail | 2025 |
| Ziggurat XYZ Ltd | Professional & scientific | 2016 |
| Ziggylee Company Ltd | Construction | 2022 |
| ZIH Ltd | Construction | 2012 |
| Zikol Ltd | Wholesale & retail | 2020 |
| ZIL Staffing Solutions Ltd | Administrative & support | 2022 |
| Zilphia Michael Homes Ltd | Real estate | 2023 |
| Zimbali Ltd | Information & communication | 2010 |
| Zinc Digital Business Solutions Limited | Information & communication | 2004 |
| Zinc Digital Creative Marketing Ltd | Information & communication | 2019 |
| Zincbooks Limited | Administrative & support | 2017 |
| Zinck Aviation Limited | Transport & logistics | 2022 |
| Zing Apparel Ltd | Wholesale & retail | 2023 |
| Zing Medical Education Limited | Education | 2019 |
| ZIP ZAP Computers Limited | Information & communication | 2002 |
| Zip-Mac Trans Ltd | Transport & logistics | 2013 |
| Zippyzorb Ltd | Wholesale & retail | 2011 |
| Zircon Technologies Ltd | Information & communication | 2012 |
| Ziva Vedics Limited | Education | 2024 |