| YOG Consultancy Services Limited | Information & communication | 2014 |
| YONI66 Ltd | Construction | 2025 |
| Your Carhouse Ltd | Wholesale & retail | 2015 |
| Your Healthcare Community Interest Company | Health & social care | 2008 |
| Your Home Philosophy Ltd | Extraterritorial | 2025 |
| Your Local Plumbing Company Ltd | Construction | 2008 |
| Your Mediation Limited | Professional & scientific | 2025 |
| Your Surbiton Music School Ltd | Education | 2021 |
| Yourcare Partnership Limited | Health & social care | 2018 |
| YP Consulting Limited | Health & social care | 2012 |
| YRS Ashcombe House Investments Ltd | Real estate | 2026 |
| Yummy Foodds LTS Limited | Hospitality | 2025 |
| YUSUF14 Limited | Transport & logistics | 2016 |
| YW Horizon Ltd | Wholesale & retail | 2026 |
| YZ Homes Limited | Construction | 2010 |
| Zafrana Field Limited | Real estate | 2025 |
| Zaibis Enterprises Ltd | Wholesale & retail | 2019 |
| Zamzam Elite Motors Ltd | Wholesale & retail | 2024 |
| ZAP2CONSULTING Ltd | Information & communication | 2015 |
| Zays Bakes London Ltd | Hospitality | 2025 |
| Zazaki Limited | Real estate | 2022 |
| ZED Logistics Ltd | Transport & logistics | 1995 |
| ZED Logistics Surrey Ltd | Transport & logistics | 1992 |
| Zeina Properties Ltd | Real estate | 2026 |
| Zeintix Ltd | Wholesale & retail | 2024 |
| Zenatech Ltd | Wholesale & retail | 2008 |
| Zenobia's Consultancy Ltd | Health & social care | 2018 |
| Zenon X Unlimited Limited | Information & communication | 2025 |
| Zephyr Renewable Energy UK Limited | Manufacturing | 2025 |
| Zero Forty Homes Ltd | Real estate | 2020 |
| Ziada Limited | Wholesale & retail | 2008 |
| Zimidar Online Limited | Wholesale & retail | 2024 |
| Zion Investment UK Ltd | Real estate | 2023 |
| ZIP Flats Ltd | Administrative & support | 2019 |
| ZK Training Ltd | Administrative & support | 2015 |
| ZL Auto Limited | Wholesale & retail | 2023 |
| Zoe's Kingston Limited | Wholesale & retail | 2010 |
| Zoran's Delicatessen Limited | Hospitality | 2015 |
| ZQ19 Property Consultants Ltd | Real estate | 2024 |
| ZR - Property Management Limited | Real estate | 2024 |
| Zr-Upgrade Limited | Education | 2024 |
| Ztyw Design Limited | Professional & scientific | 2025 |
| ZZZ Constructions Ltd | Construction | 2020 |
| Étoile Childcare Ltd | Health & social care | 2025 |
| Étoile Salon DE Coiffure Ltd | Other services | 2025 |
| Ô Gourmet Libanais Ltd | Hospitality | 2015 |
| “Artis UK” Limited | Construction | 2017 |