| Yapwingfoo Limited | Real estate | 2019 |
| Yarty Cordials Limited | Manufacturing | 2014 |
| Yasin’S Kitchen Ltd | Hospitality | 2026 |
| Year END Limited | Professional & scientific | 2022 |
| Yehssub Ltd | Hospitality | 2026 |
| Yehsub Ltd | Hospitality | 2026 |
| Yellow Project Management Ltd | Professional & scientific | 2020 |
| Yeoman Construction LLP | | 2009 |
| Yeoman Nursing Homes Limited | Real estate | 2007 |
| Yeoman Nursing Homes Properties LLP | | 2008 |
| YHM Group Limited | Households | 2025 |
| Yhwh Chosen Ones Ltd | Education | 2019 |
| Yodah Logistics Limited | Transport & logistics | 2016 |
| Yorkshire Industrial Ltd. | Wholesale & retail | 2010 |
| Yoruba Roots Limited | Education | 2023 |
| Young George Pawnbroking Limited | Wholesale & retail | 2001 |
| Your Health for YOU Ltd | Real estate | 2017 |
| Your Intelligence - Y.I. Ltd | Administrative & support | 2026 |
| Your Next Property Investment Limited | Real estate | 2025 |
| Your Recovery Automotive Ltd | Wholesale & retail | 2021 |
| Yoyo-Ty Ltd | Transport & logistics | 2025 |
| YR Electrical Ltd | Manufacturing | 2018 |
| Yuecheng Limited | Hospitality | 2025 |
| Yugigrade Ltd | Wholesale & retail | 2025 |
| Yumyum Kebab Limited | Hospitality | 2025 |
| Z Barber Portsmouth Ltd | Other services | 2023 |
| Z Hashmi Co Limited | Wholesale & retail | 2026 |
| ZA Accountants & Auditors Ltd | Professional & scientific | 2026 |
| ZAM ZAM Lettings Agency Ltd | Households | 2013 |
| Zarmed Ltd | Health & social care | 2025 |
| ZAYTOONA88 Ltd | Health & social care | 2019 |
| ZBZ5 Associates Limited | Information & communication | 2022 |
| ZE HAY Ltd | Administrative & support | 2026 |
| Zebari Ltd | Other services | 2025 |
| ZEN Chinese Ltd | Hospitality | 2018 |
| ZEN Garden Portsmouth Ltd | Hospitality | 2023 |
| ZEN Style Ltd | Other services | 2013 |
| Zen-Decorating Ltd | Construction | 2020 |
| Zenda Limited | Hospitality | 2002 |
| Zenith Education Consulting Limited | Education | 2017 |
| Zenithrec Ltd | Administrative & support | 2023 |
| Zero Fitness Ltd | Extraterritorial | 2021 |
| Zhao International Limited | Arts & recreation | 2025 |
| Zhenwu Wudang Wellness Arts CIC | Education | 2025 |
| ZL Global Arts Academy Ltd | Professional & scientific | 2016 |
| Zlati Transport Ltd | Transport & logistics | 2015 |
| Zulu Estates Limited | Real estate | 2026 |
| Zumos Wellbeing Limited | Information & communication | 2017 |