| Yellow Tree Wellbeing Limited | Professional & scientific | 2022 |
| Yenza Ltd | Real estate | 2016 |
| YIN Yang Chinese Kitchen Limited | Hospitality | 2021 |
| Yoozoom Limited | Extraterritorial | 2006 |
| Yoozoom Technologies Ltd | Wholesale & retail | 2011 |
| Yorktown Holdings Limited | Financial services | 2018 |
| Young Capital Ventures Limited | Extraterritorial | 2023 |
| Young Propco Limited | Real estate | 2018 |
| Your Confidence Coach Limited | Other services | 2023 |
| Your Dream French Property Limited | Professional & scientific | 2006 |
| Your Dream Italian Property Limited | Professional & scientific | 2006 |
| Your Garden Needs Ltd | Administrative & support | 2022 |
| Your Local Bookkeeper Limited | Professional & scientific | 2022 |
| Your Team Digital Limited | Information & communication | 2020 |
| Yowsa Limited | Information & communication | 2007 |
| Yoyo Master Chef Ltd | Hospitality | 2025 |
| YRH Finance Team Limited | Professional & scientific | 2020 |
| YTR Ltd | Construction | 2016 |
| Yuki (2022) Limited | Information & communication | 2022 |
| Yumax Brand Limited | Administrative & support | 2017 |
| Yumax Fashion Limited | Wholesale & retail | 2022 |
| Yumax Group Limited | Administrative & support | 2018 |
| Yummies Film Catering Limited | Hospitality | 2022 |
| Zada Restaurant Limited | Hospitality | 2017 |
| Zafas Enterprises Ltd | Wholesale & retail | 2024 |
| Zara Christie Ltd | Manufacturing | 2009 |
| Zaria Travel Ltd | Administrative & support | 2024 |
| Zarquon Consulting Limited | Professional & scientific | 2024 |
| Zazou Ltd | Extraterritorial | 2017 |
| Zeebra Therapy Ltd | Health & social care | 2022 |
| Zego Boats Limited | Manufacturing | 2022 |
| Zenis Limited | Professional & scientific | 1995 |
| Zenith Cafe Ltd | Information & communication | 2003 |
| Zenith Publishing Limited | Information & communication | 1998 |
| Zero DRY Time Farnham Limited | Administrative & support | 2019 |
| Zero Fuss Limited | Professional & scientific | 2011 |
| Zeus International Management Limited | Professional & scientific | 2014 |
| Zigmat Consulting Limited | Information & communication | 2021 |
| ZM Mobile Valet Ltd | Wholesale & retail | 2024 |
| Zody Ltd | Wholesale & retail | 2017 |
| ZOE Taylor's Travel Ltd | Administrative & support | 2024 |
| ZOK International Group Limited | Manufacturing | 1996 |
| Zppr Books Ltd | Information & communication | 2015 |
| Zppr Limited | Information & communication | 2015 |
| Zyis Limited | Information & communication | 2010 |
| Zynopay Ltd | Financial services | 2021 |