| Xploreagile Ltd | Information & communication | 2023 |
| Y Star Food Ltd | Hospitality | 2026 |
| Y Star Ltd | Hospitality | 2024 |
| Y&A (London) Limited | Construction | 2009 |
| Yajinden Services Limited | Information & communication | 2016 |
| Yardyield Limited | Real estate | 1983 |
| Yayla Catering Ltd | Hospitality | 2025 |
| Yeti Partnership Limited | Professional & scientific | 2006 |
| YH Therapeutic Services Ltd | Health & social care | 2022 |
| Ynwa Builders Ltd | Construction | 2024 |
| YOU Name IT Limited | Professional & scientific | 2024 |
| Youlio Limited | Health & social care | 2019 |
| Young and Pike Design Studio Limited | Administrative & support | 2024 |
| Your Town Store Limited | Administrative & support | 2000 |
| Your Wellness Group Limited | Administrative & support | 2013 |
| YSK Freeholdco Limited | Construction | 2026 |
| YSK Intermediateco Limited | Construction | 2026 |
| Yulang Limited | Hospitality | 2015 |
| Zalihe Limited | Other services | 2018 |
| Zanayt Ltd | Information & communication | 2025 |
| Zapiensolar Ltd | Construction | 2023 |
| Zaty Ltd | Health & social care | 2010 |
| Zayma 2 Ltd | Financial services | 2022 |
| Zenhloso Ltd | Professional & scientific | 2026 |
| Zeven Limited | Wholesale & retail | 2012 |
| Zh&F Services Ltd | Construction | 2018 |
| Zimag Ltd | Hospitality | 2024 |
| Zipfarming Limited | Financial services | 2019 |
| Zipinsure Limited | Financial services | 2020 |
| ZOE HOMES3 Limited | Real estate | 2025 |
| ZOE Matilda Management Limited | Professional & scientific | 2022 |
| Zoft Business Consulting Ltd | Professional & scientific | 2023 |
| Zone Health Limited | Other services | 2022 |
| Zstage (UK) Limited | | 2013 |
| Zytro Ltd | Professional & scientific | 2016 |