| Z U & ZI Limited | Public administration | 2023 |
| Z Zaman Ltd | Health & social care | 2020 |
| Z&S Arts and Craft Supplies Ltd | Manufacturing | 2020 |
| Z&U Partners Ltd | Wholesale & retail | 2024 |
| Z.A. Jafry Ltd | Wholesale & retail | 2003 |
| Z.A.D Properties Limited | Real estate | 2026 |
| Z.K.Visioncare Ltd | Health & social care | 2025 |
| Z.M. KSA Ltd. | Health & social care | 2021 |
| Z.M01 Ltd | Transport & logistics | 2026 |
| Z.U.H Self Drive Ltd | Administrative & support | 2024 |
| Z47 Windows & Shopfronts Limited | Other services | 2025 |
| Z4S Limited | Wholesale & retail | 2026 |
| ZA Batley Desserts Ltd | Wholesale & retail | 2025 |
| ZA Community Officials Ltd | Education | 2020 |
| ZA Dreams Ltd | Manufacturing | 2025 |
| ZA Healthcare Limited | Health & social care | 2022 |
| ZA Motor Repairs Ltd | Wholesale & retail | 2023 |
| ZA Properties Bradford Ltd | Real estate | 2025 |
| ZA Services (Yorkshire) Limited | Other services | 2022 |
| ZA Sons Holdings Limited | Real estate | 2023 |
| ZA Synergy Co Ltd | Wholesale & retail | 2024 |
| Zaac Property Investments Ltd | Real estate | 2017 |
| Zaba Fashion Ltd | Wholesale & retail | 2024 |
| Zabka 68 Limited | Wholesale & retail | 2025 |
| ZAC Healthcare Ltd | Health & social care | 2015 |
| Zachary James Consultancy Ltd | Professional & scientific | 2023 |
| Zacukshopper Ltd | Wholesale & retail | 2016 |
| Zada Healthcare Ltd | Health & social care | 2014 |
| Zada Traders Ltd | Wholesale & retail | 2020 |
| Zadaz Interiors Ltd | Construction | 2024 |
| Zadran Limited | Wholesale & retail | 2025 |
| Zadz Limited | Transport & logistics | 2025 |
| Zafar Iqbal Holdings Ltd | Real estate | 2022 |
| Zafco Engineering Ltd | Wholesale & retail | 2023 |
| Zafdynasty Limited | Transport & logistics | 2025 |
| Zaffran Persian and Arabic Restaurant Ltd | Hospitality | 2023 |
| Zafi Labs Ltd | Manufacturing | 2025 |
| Zafproduction Ltd | Information & communication | 2017 |
| ZAH Ltd | Professional & scientific | 2026 |
| Zaha Homes Ltd | Real estate | 2026 |
| Zahaahmed Ltd | Real estate | 2026 |
| Zahash Consultancy Ltd | Professional & scientific | 2025 |
| Zahbro Sports Limited | Wholesale & retail | 2009 |
| Zahd Ltd | Wholesale & retail | 2024 |
| Zaheer.A Pharma Ltd | Professional & scientific | 2018 |
| Zahhuf Ltd | Construction | 2024 |
| Zahid and Munib Limited | Wholesale & retail | 2025 |
| Zahid Holdings Ltd | Financial services | 2026 |
| Zahid Works Ltd | Wholesale & retail | 2026 |
| Zahra Beds Limited | Wholesale & retail | 2021 |
| Zahra's Portfolio Limited | Real estate | 2020 |
| Zahram Trading Ltd | Wholesale & retail | 2025 |
| ZAI Developments Ltd | Construction | 2018 |
| Zaiba Khan Training Academy Limited | Health & social care | 2014 |
| Zaiman Co Ltd | Wholesale & retail | 2026 |
| Zain Amazon Ltd | Wholesale & retail | 2025 |
| Zain Bangash Limited | Households | 2025 |
| Zain Financial Consultancy Limited | Financial services | 2015 |
| Zain Jewellers Ltd | Manufacturing | 2024 |
| Zain Superstore Ltd | Wholesale & retail | 2024 |
| Zainab Babatunde Ltd | Health & social care | 2023 |
| Zainish Ltd | Wholesale & retail | 2020 |
| Zaisia Limited | Real estate | 2025 |
| Zajil Limited | Wholesale & retail | 2019 |
| ZAK & Shak Waste Management Limited | Water & waste | 2026 |
| ZAK Accountants Ltd | Professional & scientific | 2023 |
| ZAK Care Ltd | Health & social care | 2021 |
| Zak's Pantry Ltd | Hospitality | 2025 |
| Zaka Accountants Limited | Manufacturing | 2025 |
| Zakam Holdings Ltd | Administrative & support | 2026 |
| Zakan Investments Limited | Financial services | 2024 |
| Zakaria Limited | Transport & logistics | 2020 |
| Zakat Sadka Fitrana Fidya Ltd | Construction | 2021 |
| Zakdan Limited | Wholesale & retail | 2020 |
| Zaki Properties Ltd | Real estate | 2022 |
| Zakia Chowdrey Limited | Other services | 2020 |
| Zakir Locum Limited | Health & social care | 2022 |
| Zakrah Allcare Ltd | Wholesale & retail | 2025 |
| Zaks Prestige Ltd | Wholesale & retail | 2021 |
| Zaks Recycling Services Limited | Water & waste | 2021 |
| Zakseal Home Improvements Ltd | Other services | 2024 |
| Zakss Holdings Ltd | Real estate | 2025 |
| ZAM Business Ltd | Wholesale & retail | 2018 |
| ZAM Travels and Tours Ltd | Administrative & support | 2016 |
| Zama Swat Ltd | Wholesale & retail | 2025 |
| Zamaans Fast Food and Curry House Ltd | Hospitality | 2020 |
| Zaman Optical Limited | Health & social care | 2023 |
| Zaman Solutions Ltd | Information & communication | 2023 |
| Zamzam Housing Ltd | Real estate | 2025 |
| Zanachicken Limited | Hospitality | 2020 |
| Zanco Mobile Ltd | Wholesale & retail | 2016 |
| Zanco Retail Store Limited | Wholesale & retail | 2024 |
| Zanderwood Publishing Limited | Information & communication | 2026 |
| Zaomi Wholesale Ltd | Wholesale & retail | 2025 |
| ZAP and Glow Ltd | Other services | 2025 |
| ZAP Property Services Ltd | Real estate | 2024 |
| Zapbrite Ltd | Wholesale & retail | 2025 |
| Zapride Bradford Limited | Administrative & support | 2025 |
| ZAR Financial Consultant Limited | Financial services | 2017 |
| ZAR PVT Ltd | Wholesale & retail | 2024 |