| Xlaunch Limited | Professional & scientific | 2018 |
| XLS Accounting Ltd | Professional & scientific | 2025 |
| Xmas Planet Limited | Wholesale & retail | 2025 |
| Xpedite Vehicles Limited | Wholesale & retail | 2023 |
| Xpertia Ltd | Information & communication | 2021 |
| Xtrvrt Ltd | Other services | 2022 |
| Y4 Consultancy (HCS) Limited | Information & communication | 2021 |
| Yabac FC Limited | Education | 2024 |
| Yagmur Kozan Ltd | Other services | 2025 |
| Yakin Dogu Amerikan Universitesi Limited | Extraterritorial | 2013 |
| Yakin Dogu Avrupa Universitesi Limited | Extraterritorial | 2013 |
| Yakin Dogu Universitesi Limited | Extraterritorial | 2013 |
| Yalcin Electric Ltd | Manufacturing | 2020 |
| Yale Enterprise Limited | Real estate | 2017 |
| Yani Commercial Limited | Wholesale & retail | 2023 |
| Yaser Services Ltd | Construction | 2021 |
| Yasin Yusuf Ltd | Real estate | 2020 |
| YCA Trans Ltd | Transport & logistics | 2020 |
| YE Market Takeaway Ltd | Hospitality | 2020 |
| Yellow Saffron Limited | Real estate | 2025 |
| Yeti Management Consulting Limited | Professional & scientific | 2015 |
| Yilmazlar Limited | Hospitality | 2020 |
| Ykda Limited | Real estate | 2018 |
| Ymbr Limited | Hospitality | 2019 |
| Yogadoo Limited | Other services | 2018 |
| Yoova Limited | Construction | 2020 |
| York House Consulting Ltd | Professional & scientific | 2024 |
| York Road Estates Limited | Real estate | 2020 |
| Your AI Assistant Limited | Professional & scientific | 2025 |
| Your Katapult Ltd | Administrative & support | 2021 |
| Your Simpal | Health & social care | 2016 |
| Yourmuzic Limited | Wholesale & retail | 2021 |
| Yourmuzic Live Limited | Wholesale & retail | 2024 |
| Yurekli Textile Ltd | Wholesale & retail | 2020 |
| Yuvaraj Palanisamy Limited | Wholesale & retail | 2019 |
| Yyyk Limited | Hospitality | 2015 |
| Zaabu Health Care Limited | Health & social care | 2017 |
| Zagua Ltd | Arts & recreation | 2023 |
| Zahabi Ventures Ltd | Wholesale & retail | 2025 |
| ZAS Asset Management Ltd | Real estate | 2025 |
| Zauisomue Ltd | Health & social care | 2018 |
| Zebra Worldwide Ltd | Wholesale & retail | 2022 |
| ZEG 4 YOU Construction Ltd | Construction | 2025 |
| Zelaa Limited | Hospitality | 2018 |
| Zemaur Limited | Professional & scientific | 2020 |
| Zenicube Consulting Ltd | Professional & scientific | 2026 |
| Zenith Lettings Limited | Real estate | 2015 |
| Zenvor Ltd | Wholesale & retail | 2026 |
| Zero Line Electrical Ltd | Construction | 2025 |
| Zeromileage London Ltd | Wholesale & retail | 2025 |
| Zeytin Tree Limited | Real estate | 2019 |
| Ziga Cleaning Services Limited | Administrative & support | 2025 |
| ZIM Consultancy Limited | Professional & scientific | 2012 |
| Zinshear Limited | Professional & scientific | 1986 |
| ZJ Ltd | Professional & scientific | 2018 |
| Zofia SPV Ltd | Information & communication | 2024 |
| Zone Property Services Ltd | Construction | 2024 |
| Zoochie Ltd | Wholesale & retail | 2016 |
| Zorluna Limited | Other services | 2021 |
| Zsda Investments Limited | Real estate | 2019 |
| ZSS Construction and Renovation Ltd | Construction | 2025 |
| Zuwin Properties Ltd | Real estate | 2019 |
| Zydane Ltd | Wholesale & retail | 2023 |