| YW Qualitycare Consultancy Ltd | Health & social care | 2020 |
| Z & a Asset Management Limited | Real estate | 2017 |
| Z & U Online Ltd | Wholesale & retail | 2013 |
| Z C Fitness Ltd | Arts & recreation | 2025 |
| Z Carter Consultancy Ltd | Professional & scientific | 2025 |
| Z Diamonds Ltd | Wholesale & retail | 2026 |
| Z E Trade Limited | Wholesale & retail | 2025 |
| Z&A Aesthetics Ltd. Limited | Health & social care | 2025 |
| Z&A Autos MCR Ltd | Wholesale & retail | 2025 |
| Z&I Refurbz Ltd | Construction | 2022 |
| Z&S Logistics Ltd | Transport & logistics | 2025 |
| Z&Sons Property Ltd | Real estate | 2021 |
| Z&T Ventures Limited | Professional & scientific | 2024 |
| Z&Z Property Ltd | Real estate | 2025 |
| Z-A Car Hire Ltd | Transport & logistics | 2025 |
| ZA Electric Ltd | Construction | 2025 |
| ZA Property Investments Ltd | Real estate | 2018 |
| ZA Threads Ltd | Wholesale & retail | 2026 |
| Zaaljul Ltd | Hospitality | 2024 |
| ZAB18 Limited | Wholesale & retail | 2025 |
| ZAC Co Travel Limited | Transport & logistics | 2025 |
| Zacharia Solicitors Limited | Professional & scientific | 2022 |
| Zackariahs Ltd | Wholesale & retail | 2022 |
| Zackz Motorz Ltd | Wholesale & retail | 2026 |
| Zaelisal Ltd | Real estate | 2024 |
| ZAF Mobiles Limited | Wholesale & retail | 2023 |
| Zagglobals Limited | Wholesale & retail | 2021 |
| ZAH Housing Ltd | Households | 2025 |
| Zahid Enterprises Limited | Wholesale & retail | 2020 |
| Zahid Inayat Limited | Information & communication | 2024 |
| Zahid Travels Ltd | Transport & logistics | 2025 |
| Zahra Maryam Enterprises Limited | Wholesale & retail | 2025 |
| Zahras Electrical Services Ltd | Construction | 2024 |
| Zaikin Properties Ltd | Real estate | 2026 |
| Zain Nazir Ltd | Wholesale & retail | 2025 |
| Zaineb Optical Ltd | Other services | 2023 |
| ZAK Tracks Ltd | Administrative & support | 2022 |
| Zaka Transport Ltd | Transport & logistics | 2019 |
| Zaki and Zaynah Properties Ltd | Real estate | 2025 |
| Zaktrainspt Limited | Other services | 2025 |
| Zalad Properties Ltd | Real estate | 2026 |
| Zaman Auto Limited | Wholesale & retail | 2021 |
| Zaman Healthcare Limited | Health & social care | 2010 |
| Zamy Ltd | Health & social care | 2026 |
| Zane Designerwear Limited | Wholesale & retail | 2008 |
| Zane Property Ltd | Real estate | 2024 |
| Zani Collections Ltd | Wholesale & retail | 2025 |
| Zaplab Mobile Repair Limited | Other services | 2025 |
| Zar-E-Noor Ltd | Wholesale & retail | 2026 |
| Zara CS Ltd | Information & communication | 2022 |
| Zara Exclusive Limited | Wholesale & retail | 2018 |
| Zara-Hareem Ltd | Wholesale & retail | 2026 |
| Zaraks Foodservice Ltd | Hospitality | 2018 |
| Zaraks Home of Steaks Ltd | Hospitality | 2022 |
| Zarco Lube Limited | Wholesale & retail | 2025 |
| Zarco OIL and Lubricant Industries UK Limited | Wholesale & retail | 2024 |
| ZAS Management Ltd | Real estate | 2026 |
| Zavi T Ltd | Wholesale & retail | 2026 |
| Zawzir Ltd | Real estate | 2025 |
| ZBK Ltd | Real estate | 2024 |
| ZDS Logistic Ltd | Transport & logistics | 2025 |
| ZE Transport Limited | Extraterritorial | 2022 |
| Zeal Developments (Manchester) Ltd | Real estate | 2025 |
| Zebady Food Limited | Hospitality | 2024 |
| Zee&Z Limited | Wholesale & retail | 2024 |
| Zeeh's Beauty Lounge Limited | Wholesale & retail | 2025 |
| Zeertech Accounting Ltd | Professional & scientific | 2025 |
| Zeeshan Rasheed Limited | Wholesale & retail | 2021 |
| Zeetok Ltd | Health & social care | 2023 |
| Zemby Property Limited | Construction | 2025 |
| Zemla Limited | Extraterritorial | 2024 |
| ZEN Steel Buildings Ltd | Construction | 2023 |
| Zena Accessories Ltd | Other services | 2026 |
| Zencleanco Limited | Administrative & support | 2025 |
| Zendodont Ltd | Health & social care | 2025 |
| Zengen Ltd | Construction | 2024 |
| Zenith Academy CC Ltd | Education | 2025 |
| Zenith Fire and Security Ltd | Extraterritorial | 2010 |
| Zenith Property Group Ltd | Real estate | 2021 |
| Zenith Resourcing Limited | Administrative & support | 2014 |
| Zentara One Limited | Wholesale & retail | 2025 |
| Zentari AI Limited | Wholesale & retail | 2025 |
| Zero DRY Time Stockport Cheshire Ltd. | Other services | 2015 |
| Zest Cafe Oldham Ltd | Hospitality | 2025 |
| Zeste Ltd | Hospitality | 2019 |
| Zeus Expert Services Ltd | Health & social care | 2017 |
| Zeyna Fashion Ltd | Wholesale & retail | 2017 |
| ZF Maintenance Ltd | Construction | 2025 |
| Zhassium Ltd | Professional & scientific | 2023 |
| Zhian Ltd | Professional & scientific | 2022 |
| Zi.Mpharm Ltd | Health & social care | 2022 |
| ZIG ZAG Express Limited | Transport & logistics | 2013 |
| Ziggy's Schoolwear Limited | Wholesale & retail | 2016 |
| Ziii Ltd | Wholesale & retail | 2025 |
| Ziip Media Ltd | Professional & scientific | 2017 |
| Zikzak Homes Ltd | Real estate | 2020 |
| ZIM Property Group Limited | Real estate | 2024 |
| Ziniki Consulting Ltd | Information & communication | 2017 |
| Zinkkd Ltd | Manufacturing | 2026 |
| Zionbrite Super Clean Services Ltd | Administrative & support | 2025 |