| ZA & SM Ltd | Real estate | 2019 |
| ZA Enterprises HFD Limited | Transport & logistics | 2024 |
| ZA Finance Limited | Professional & scientific | 2025 |
| ZA Global Trade Ltd | Wholesale & retail | 2026 |
| ZA Legal Services Limited | Professional & scientific | 2026 |
| ZA Pharm Ltd | Health & social care | 2022 |
| ZA Sapphire Co Ltd | Wholesale & retail | 2026 |
| Zacava | Financial services | 2018 |
| ZAH Delivery Services Ltd | Transport & logistics | 2022 |
| Zaha Consultancy Ltd | Health & social care | 2013 |
| Zaha Healthcare Ltd | Health & social care | 2018 |
| Zahid a. Khokar Ltd | Wholesale & retail | 2006 |
| Zain Private Limited | Health & social care | 2024 |
| Zaitun Development Limited | Hospitality | 2018 |
| ZAK Autoparts Limited | Wholesale & retail | 2010 |
| Zak's Crispy Chicken Ltd | Hospitality | 2025 |
| Zakhtar Consulting Limited | Information & communication | 2018 |
| Zakiinsights Limited | Wholesale & retail | 2024 |
| Zakul Limited | Real estate | 2019 |
| Zak’S Desserts Ltd | Hospitality | 2026 |
| ZAM Advisory Limited | Professional & scientific | 2019 |
| Zaman Investment HD Ltd | Information & communication | 2023 |
| Zaman N Sons Ltd | Wholesale & retail | 2023 |
| Zamilu Engineering Design Limited | Wholesale & retail | 2017 |
| Zamzam Takeaway Ltd | Hospitality | 2026 |
| Zamzam Travel and Tours Ltd | Administrative & support | 2013 |
| Zaneyco UK Ltd | Wholesale & retail | 2019 |
| Zany Glass Ltd | Arts & recreation | 2022 |
| Zapato Brewery Ltd. | Manufacturing | 2015 |
| Zapex Limited | Real estate | 2023 |
| Zaphand Ltd | Information & communication | 2025 |
| Zapnetix Ltd | Construction | 2025 |
| ZAR Associates Limited | Professional & scientific | 2011 |
| Zara's Spice Ltd | Hospitality | 2023 |
| Zara-Mhr Ltd | Health & social care | 2022 |
| Zarah Care Ltd | Health & social care | 2015 |
| Zarmyn Limited | Mining & quarrying | 2019 |
| ZAS Eyecare Limited | Health & social care | 2023 |
| ZAS Global Enterprises Ltd | Construction | 2024 |
| Zavhara Ltd | Transport & logistics | 2026 |
| Zayaan Mehr Limited | Professional & scientific | 2018 |
| Zaytuna Properties Ltd | Wholesale & retail | 2020 |
| Zc&Ss Ltd | Wholesale & retail | 2025 |
| ZCS1 Ltd | Wholesale & retail | 2025 |
| ZCS2 Ltd | Wholesale & retail | 2025 |
| ZCSS1 Ltd | Wholesale & retail | 2025 |
| ZD Digital Ltd | Information & communication | 2025 |
| ZD Wholesale Limited | Wholesale & retail | 2023 |
| Zeal Medical Limited | Health & social care | 2011 |
| Zeaw Limited | Hospitality | 2022 |
| ZEB Pervaiz Limited | Financial services | 2025 |
| Zebra Textile Ltd | Other services | 2010 |
| ZED Consultants Ltd | Information & communication | 2017 |
| ZEE Hair Studio Ltd | Other services | 2025 |
| ZEE Stores Limited | Wholesale & retail | 2025 |
| ZEE Taxi Services Ltd | Transport & logistics | 2024 |
| Zeecss Ltd | Wholesale & retail | 2025 |
| Zeedian International Ltd | Wholesale & retail | 2026 |
| Zeenat Skin & Laser Clinic Limited | Other services | 2025 |
| Zelos Consultancy Limited | Professional & scientific | 2021 |
| ZEM Holdings Limited | Real estate | 2016 |
| Zempathy Limited | Health & social care | 2025 |
| ZEN a Training Limited | Education | 2024 |
| ZEN Zone Zephyr Global Ltd | Wholesale & retail | 2023 |
| Zenia Wealth Management Limited | Professional & scientific | 2017 |
| Zenith Advisory Partners Limited | Administrative & support | 2020 |
| Zennest Limited | Wholesale & retail | 2024 |
| Zenspace Ltd | Real estate | 2025 |
| Zepzap Ltd | Wholesale & retail | 2023 |
| Zero Fade 1 Limited | Other services | 2024 |
| Zero Yorkshire Ltd | Wholesale & retail | 2018 |
| Zeroderma Limited | Wholesale & retail | 2000 |
| Zest Architects Ltd | Professional & scientific | 2011 |
| Zest for Print Ltd | Professional & scientific | 2012 |
| Zest Services Ltd | Administrative & support | 2024 |
| Zesty Vape Huddersfield Ltd | Wholesale & retail | 2022 |
| Zetrina Associates Limited | Professional & scientific | 2008 |
| ZH Accounting Ltd | Professional & scientific | 2013 |
| ZH Home Improvement Services Ltd | Construction | 2019 |
| ZHH Services Ltd | Administrative & support | 2025 |
| Zhomemade Ltd | Hospitality | 2023 |
| Ziggy Group Holdings Ltd | Financial services | 2025 |
| Zigzack Limited | Construction | 2024 |
| Ziim Pharma Ltd | Health & social care | 2015 |
| Zineir Group Limited | Transport & logistics | 2025 |
| Ziss Investments Ltd | Real estate | 2025 |
| Ziza Cuts Ltd | Other services | 2026 |
| Ziza Holdings Ltd | Financial services | 2024 |
| ZKH Optics Ltd | Health & social care | 2023 |
| ZM Construction and Property Development Ltd | Construction | 2019 |
| ZM Renovations Ltd | Extraterritorial | 2025 |
| ZM School of Motoring Ltd | Education | 2024 |
| ZMA Organisation Ltd | Transport & logistics | 2024 |
| ZN Optics Limited | Other services | 2013 |
| ZNK Motors Limited | Wholesale & retail | 2024 |
| Zods Ltd | Wholesale & retail | 2011 |
| Zoelia Enterprises Ltd | Wholesale & retail | 2025 |
| Zohaib Nadir Limited | Wholesale & retail | 2024 |
| Zorr Wellness CIC | Arts & recreation | 2026 |
| Zorro International Limited | Wholesale & retail | 2017 |