| YUL Facades Ltd | Construction | 2024 |
| Yummy Box Limited | Other services | 2020 |
| Yummy Caterers Limited | Hospitality | 2023 |
| YUN GUI Hanfu Limited | Wholesale & retail | 2023 |
| Yunatech Limited | Information & communication | 2006 |
| Yunatech Live Services Limited | Information & communication | 2023 |
| Yusuf Barbers Limited | Real estate | 2023 |
| Yusuf Consultancy Services Ltd | Information & communication | 2016 |
| Yusuf CUT Barbers Limited | Other services | 2024 |
| YVN Limited | Wholesale & retail | 2024 |
| Z Firestopping Ltd | Construction | 2024 |
| Z Line Technologies Limited | Information & communication | 2024 |
| Z Properties London Ltd | Construction | 2026 |
| Z&A Property Investments Ltd | Real estate | 2023 |
| Z&D Group Ltd | Hospitality | 2024 |
| Z&H Facilities Ltd | Construction | 2023 |
| Z&Q Accountants Ltd | Professional & scientific | 2025 |
| Z&S Property Investments Limited | Real estate | 2023 |
| Z&Z Distros Ltd | Wholesale & retail | 2024 |
| Z&Z Tech Ltd | Information & communication | 2018 |
| Z-Tech Solutions Ltd | Information & communication | 2008 |
| Z.S.N Accountancy Services Ltd | Professional & scientific | 2024 |
| ZA Mortgage Solutions Ltd | Financial services | 2020 |
| ZA United Ltd | Transport & logistics | 2016 |
| Zaak Limited | Wholesale & retail | 2019 |
| ZAB Events & Media Services UK Ltd | Professional & scientific | 2021 |
| Zach JEM Ltd | Financial services | 2022 |
| ZAD Tronics Limited | Wholesale & retail | 2024 |
| Zadco Foods UK Limited | Wholesale & retail | 2026 |
| ZAE Properties Ltd | Hospitality | 2026 |
| Zafa LDN Limited | Administrative & support | 2022 |
| Zaha Store Ltd | Wholesale & retail | 2024 |
| Zahoor Ventures Ltd | Real estate | 2024 |
| Zahroon Ltd | Real estate | 2025 |
| Zainia Ltd | Real estate | 2021 |
| ZAK a Heath Ltd | Professional & scientific | 2025 |
| Zaka Foods Limited | Wholesale & retail | 2023 |
| Zaki Investment Group Ltd | Real estate | 2020 |
| Zaks Language Services Ltd | Professional & scientific | 2018 |
| Zaks Services Limited | Wholesale & retail | 2015 |
| ZAM Properties Management Ltd | Real estate | 2020 |
| ZAM Secure Limited | Administrative & support | 2015 |
| ZAM System Solutions Ltd | Transport & logistics | 2011 |
| Zamay Consulting Ltd | Professional & scientific | 2018 |
| Zamda Ltd | Wholesale & retail | 2025 |
| Zameen.Com Builders Ltd | Extraterritorial | 2021 |
| Zamos Scaffolding Ltd | Construction | 2017 |
| ZAN Services Limited | Information & communication | 2021 |
| Zane Holdings Limited | Real estate | 2020 |
| Zanyc Ltd | Information & communication | 2023 |
| ZAP Accessories Ltd | Wholesale & retail | 2025 |
| ZAP Rail Limited | Transport & logistics | 2017 |
| Zara Curtains & Blinds Limited | Wholesale & retail | 2023 |
| Zara's Greek Kitchen & Deli Ltd | Wholesale & retail | 2023 |
| Zarae Clinic Ltd | Other services | 2026 |
| Zarcrest Limited | Hospitality | 2020 |
| Zarhomes Limited | Real estate | 2021 |
| Zarix Wholesale Ltd | Wholesale & retail | 2026 |
| Zarsi Training Ltd | Education | 2025 |
| Zarz Investments Ltd | Real estate | 2023 |
| Zarz Limited | Health & social care | 2012 |
| Zass Property Ltd | Real estate | 2021 |
| Zast Services Limited | Information & communication | 2014 |
| Zaullah Ltd | Information & communication | 2023 |
| Zava Construction Ltd | Construction | 2026 |
| Zavexatotalcleaningsolutions Limited | Administrative & support | 2025 |
| Zayan ALI Ltd | Wholesale & retail | 2024 |
| Zayman Limited | Real estate | 2019 |
| Zaymatif Limited | Real estate | 2021 |
| Zayntech Limited | Information & communication | 2017 |
| Zaynza Group Ltd | Professional & scientific | 2023 |
| ZAZ Cafe Ltd | Hospitality | 2024 |
| Zaza Potion Limited | Wholesale & retail | 2024 |
| ZBR Auto Ltd | Manufacturing | 2025 |
| ZBR Motors Ltd | Manufacturing | 2023 |
| ZC Property Ltd | Real estate | 2016 |
| ZD Services Ltd | Transport & logistics | 2023 |
| ZE Consulting Ltd | Professional & scientific | 2025 |
| Zeab Therapeutic Ltd. | Professional & scientific | 2019 |
| Zealy Ltd | Real estate | 2019 |
| Zeba'Ish Limited | Wholesale & retail | 2001 |
| Zebra Consultants Limited | Professional & scientific | 2017 |
| Zeby Ltd | Real estate | 2018 |
| Zeco Group Ltd | Financial services | 2021 |
| Zeco Limited | Wholesale & retail | 1997 |
| Zeco Properties Limited | Real estate | 2017 |
| Zeco Residential Properties Limited | Real estate | 2024 |
| Zedselling Ltd | Wholesale & retail | 2025 |
| Zedz Clothing Ltd | Manufacturing | 2021 |
| ZEE Facilities Management Ltd | Information & communication | 2023 |
| Zeenm Ltd | Wholesale & retail | 2023 |
| Zeeqar Aluminium Tubes UK Limited | Manufacturing | 2025 |
| Zeethreads Ltd | Wholesale & retail | 2026 |
| Zeiour Household Services Ltd | Administrative & support | 2025 |
| Zeitlyn Farrell Limited | Extraterritorial | 2014 |
| Zellii Limited | Administrative & support | 2020 |
| Zema Works Ltd | Construction | 2025 |
| ZEN Labs Ltd | Information & communication | 2024 |
| Zendria Limited | Information & communication | 2025 |
| Zengar Limited | Other services | 2019 |