| ZAB Property Ltd | Real estate | 2025 |
| Zads MCR Limited | Hospitality | 2017 |
| ZAF Associates Ltd | Wholesale & retail | 2022 |
| Zaff Pharmacare Ltd | Wholesale & retail | 2023 |
| ZAG Zone Limited | Manufacturing | 2026 |
| Zainab Multi Services Ltd | Wholesale & retail | 2023 |
| ZAK Pinchin Limited | Information & communication | 2024 |
| Zaks Cars Direct Ltd | Wholesale & retail | 2019 |
| Zaks Cars Doncaster Limited | Wholesale & retail | 2015 |
| Zald Transport Limited | Transport & logistics | 2025 |
| Zalwan Ltd | Wholesale & retail | 2023 |
| Zalyo Ltd | Wholesale & retail | 2021 |
| ZAM ZAM Water Ltd | Manufacturing | 2024 |
| Zamzam DMM Ltd | Wholesale & retail | 2025 |
| ZAP Garage Doors Ltd | Construction | 2000 |
| Zapnoodle Ltd | Extraterritorial | 2025 |
| Zavzi Limited | Professional & scientific | 2024 |
| Zawi Dent LLP | | 2024 |
| Zawiya 180 Engineering Consultants Ltd | Extraterritorial | 2015 |
| ZAY Way Ltd | Professional & scientific | 2022 |
| Zayd Rail Works Limited | Construction | 2018 |
| Zayk Ltd | Transport & logistics | 2016 |
| Zayna Foods Ltd | Wholesale & retail | 2025 |
| Zaytuna Bawtry Ltd | Hospitality | 2023 |
| Zaytuna Mediterranean Cuisine Ltd | Extraterritorial | 2019 |
| Zbridge Limited | Extraterritorial | 2013 |
| ZCA Cargo Ltd | Transport & logistics | 2025 |
| ZD Pizza Limited | Hospitality | 2024 |
| ZDH Transport Ltd | Transport & logistics | 2021 |
| ZE Cleaning Services Limited | Administrative & support | 2025 |
| Zebra Zest Ltd | Extraterritorial | 2025 |
| ZEC Consultancy Ltd | Professional & scientific | 2021 |
| Zeck Limited | Manufacturing | 2013 |
| Zego Retail Ltd | Wholesale & retail | 2026 |
| Zeka Trading Ltd. | Wholesale & retail | 2009 |
| Zelal Foods Ltd | Hospitality | 2026 |
| ZEN Consulting Services Limited | Information & communication | 2023 |
| ZEN CR Training Ltd | Transport & logistics | 2024 |
| Zenith Aviation Limited | Transport & logistics | 2010 |
| Zenith Crest Maintenance Limited | Administrative & support | 2024 |
| Zenith Healthcare Ltd | Health & social care | 2026 |
| Zenith Living Bentley SPV Limited | Real estate | 2026 |
| Zenith Living Limited | Construction | 2024 |
| Zenith Prime Consultancy Ltd | Wholesale & retail | 2024 |
| Zenithenele Ltd | Extraterritorial | 2025 |
| Zenithpoint Systems Ltd | Extraterritorial | 2026 |
| Zenon Enterprise Limited | Manufacturing | 2018 |
| Zentargo Ltd | Wholesale & retail | 2026 |
| Zenthar Holdings Ltd | Extraterritorial | 2026 |
| Zenthera Ltd | Extraterritorial | 2026 |
| Zenthera Systems Ltd | Extraterritorial | 2026 |
| ZER Cafe Limited | Hospitality | 2023 |
| Zest Care Ltd | Health & social care | 2019 |
| Zest Health and Wellbeing CIC | Health & social care | 2025 |
| Zestson Limited | Health & social care | 2020 |
| Zestygrill Ltd | Hospitality | 2025 |
| Zetapro Limited | Manufacturing | 1997 |
| Zetteler Limited | Professional & scientific | 2013 |
| Zeyitan Supply Solutions Ltd | Wholesale & retail | 2022 |
| ZG Fruit Wholesale Limited | Wholesale & retail | 2025 |
| Zgoda Ltd | Transport & logistics | 2024 |
| ZHZ Properties Limited | Real estate | 2022 |
| Ziapet Ltd | Transport & logistics | 2025 |
| Ziba Consult Ltd | Professional & scientific | 2023 |
| Zibi Limited | Other services | 2018 |
| Zibi Pro Trans UK Ltd | Transport & logistics | 2025 |
| Zibso Ltd | Transport & logistics | 2019 |
| Zigmar Dent LLP | | 2016 |
| Zijdelmeer Ltd | Professional & scientific | 2025 |
| Zijlstra Juridisch Advies Buro Ltd | Professional & scientific | 2007 |
| Zilan CAN Properties Limited | Real estate | 2024 |
| Zilan Ventilation Cleaning Services Ltd | Administrative & support | 2025 |
| ZIM Life Ltd | Financial services | 2024 |
| Zinella Ltd | Real estate | 2025 |
| ZIP Slides UK Limited | Arts & recreation | 2014 |
| Ziran Capital Ltd | Real estate | 2025 |
| Ziwa LA Ltd | Wholesale & retail | 2025 |
| ZJ Property Limited | Real estate | 2015 |
| ZK Virtual Assistant Ltd | Administrative & support | 2023 |
| Zkls Drivers Ltd | Transport & logistics | 2025 |
| ZLO Ventures Limited | Administrative & support | 2024 |
| Zlompol Ltd | Wholesale & retail | 2023 |
| Zmda Ltd | Transport & logistics | 2024 |
| ZNT Electrical Limited | Energy | 2018 |
| ZO & ZE Properties Ltd | Real estate | 2025 |
| ZO! TC Holding Limited | Financial services | 2019 |
| Zoal Market Ltd | Wholesale & retail | 2025 |
| ZOIP11 Ltd | Information & communication | 2016 |
| Zolmar Improvement Ltd | Construction | 2025 |
| Zoma Surgery Limited | Health & social care | 2006 |
| Zongo Mobile Ltd | Wholesale & retail | 2022 |
| Zoom Onetek Ltd | Professional & scientific | 2022 |
| Zoomies Again Box Ltd | Wholesale & retail | 2025 |
| Zoratrade Ltd | Wholesale & retail | 2025 |
| Zori&Company Limited | Wholesale & retail | 2025 |
| ZS Surveys Ltd | Professional & scientific | 2017 |
| ZSK Burger Limited | Hospitality | 2024 |
| Zsor Limited | Wholesale & retail | 2026 |
| Zsty Grill & Pizza Ltd | Hospitality | 2025 |
| Zubor Logistic Ltd | Transport & logistics | 2019 |