| Yildiz (Romford) Limited | Wholesale & retail | 2018 |
| Yildiz Meat Ltd | Wholesale & retail | 2025 |
| Yomi Transport Ltd | Transport & logistics | 2025 |
| Yoocollab Limited | Information & communication | 2020 |
| York RD Mansions Co Limited | Real estate | 2016 |
| YOU & ME Creative Ltd | Professional & scientific | 2024 |
| YOU SEE Property Ltd | Real estate | 2025 |
| Young Achievers Group Ltd | Education | 2020 |
| Your Glow Studio Limited | Other services | 2025 |
| Your House Wash Limited | Administrative & support | 2021 |
| Your Name Limited | Professional & scientific | 2025 |
| Your Property Group London Limited | Real estate | 2025 |
| Your Rentee Limited | Hospitality | 2025 |
| YR Estates Limited | Real estate | 2022 |
| YSF London Homes Ltd | Real estate | 2025 |
| YSP (Holdings) Limited | Financial services | 2021 |
| YSP Marine Limited | Arts & recreation | 2023 |
| Yummy Collection Limited | Financial services | 2018 |
| Yummy Gorringe Ltd | Hospitality | 2012 |
| Yummy Pubs Ltd | Hospitality | 2010 |
| Yummy Swan Ltd | Hospitality | 2010 |
| Yummy Teahouse Ltd | Hospitality | 2015 |
| Yummy Victoria Limited | Hospitality | 2014 |
| Yurdu Limited | Hospitality | 2024 |
| Yurga Limited | Manufacturing | 2024 |
| YVZ London Ltd | Real estate | 2026 |
| YYR Estates Ltd | Real estate | 2022 |
| Zach Barton Ltd | Administrative & support | 2022 |
| Zachnet Care Services Ltd | Health & social care | 2019 |
| Zaharia Construction Ltd | Construction | 2021 |
| ZAK Canning Personal Training Ltd | Other services | 2023 |
| Zamani Brand IP Ltd | Real estate | 2025 |
| Zamani Hospitality Ltd | Hospitality | 2025 |
| Zamani SPV Investment Ltd | Real estate | 2025 |
| Zara Services Limited | Construction | 2015 |
| Zaxri Investments Ltd | Real estate | 2024 |
| Zbimark Ltd | Construction | 2022 |
| ZC Coaching & Fitness Limited | Other services | 2025 |
| Zdrava Construction Ltd | Construction | 2020 |
| Zege Ltd | Real estate | 2026 |
| ZEL Foods Limited | Manufacturing | 2024 |
| Zenab Property Ltd | Real estate | 2023 |
| Zenaku Trading Limited | Wholesale & retail | 2023 |
| Zenith Pharmaceutical Consultancy Ltd | Professional & scientific | 2025 |
| Zeta Guarding Ltd | Other services | 2018 |
| ZEY & Adar Properties Ltd | Real estate | 2025 |
| ZHA Consultancy Limited | Professional & scientific | 2026 |
| ZHA Group Limited | Real estate | 2025 |
| Ziarenka Ltd | Wholesale & retail | 2018 |
| Zilan Pizzas Ltd | Hospitality | 2026 |
| Zion Dale Ltd | Other services | 2015 |
| Ziya Property Limited | Real estate | 2022 |
| ZMB Holdings Limited | Professional & scientific | 2016 |
| Zogno & Partners UK Ltd | Administrative & support | 2022 |
| Zuru Bespoke Solutions Ltd | Professional & scientific | 2014 |
| Ánimo Store Limited | Wholesale & retail | 2023 |
| Ánimo Yoga Ltd | Education | 2019 |