| Yorkview Limited | Real estate | 1984 |
| Yorsa Services Ltd | Administrative & support | 2022 |
| YOU and I Media Limited | Professional & scientific | 2024 |
| Young & Sons Landscape and Property Maintenance Ltd | Construction | 2026 |
| Young Contractors Limited | Professional & scientific | 2013 |
| Young Soul Education Community Interest Company | Education | 2025 |
| Young Soul Healing Limited | Health & social care | 2024 |
| Your Comfort Home Limited | Real estate | 2018 |
| Your Home Plans Limited | Professional & scientific | 2007 |
| Your Home Stagers Ltd | Other services | 2024 |
| Your Pet Matters Ltd | Wholesale & retail | 2022 |
| Your Unique Products Ltd | Wholesale & retail | 2021 |
| Youth Action and Diversity Trust Limited | Other services | 2006 |
| YS Pizza Ltd | Hospitality | 2019 |
| YUM YUM Catering Ltd | Hospitality | 2024 |
| Yumjao Properties Ltd | Real estate | 2022 |
| Yvonne . a Makeup Ltd | Other services | 2023 |
| ZA QUA Ltd | Professional & scientific | 2021 |
| Zagga Ltd | Construction | 2025 |
| Zahari Limited | Wholesale & retail | 2023 |
| Zampa Solutions Ltd | Administrative & support | 2015 |
| Zebadee Kidz Parties Limited | Arts & recreation | 2024 |
| Zeling Limited | Real estate | 2018 |
| ZEN Food Services Limited | Hospitality | 2025 |
| Zenergy Renewables Ltd | Construction | 2022 |
| Zenia Oasis Limited | Real estate | 2022 |
| Zenith Managed Services Limited | Construction | 2024 |
| ZIE Cafe Ltd | Hospitality | 2023 |
| ZIE Coffee & Co Ltd | Hospitality | 2022 |
| ZIE Coffee 2024 Limited | Hospitality | 2024 |
| ZIE ZIE Wanstead Ltd | Hospitality | 2025 |
| Ziezie Coffee Limited | Hospitality | 2025 |
| Zimta Games Ltd | Information & communication | 2023 |
| Zinc Interiors Limited | Construction | 2022 |
| Zinc Roofing Company Limited | Construction | 2014 |
| Zinc Roofing Properties Ltd | Real estate | 2020 |
| Zion Property Assets Ltd | Real estate | 2020 |
| Zion's World Ltd | Professional & scientific | 2024 |
| Zionsphere Limited | Information & communication | 2024 |
| Zippycar Club Limited | Administrative & support | 2022 |
| ZOE Marie's Limited | Other services | 2021 |
| ZOE Services Limited | Administrative & support | 2023 |
| Zoilo Restaurants Limited | Hospitality | 2012 |
| Zorg Tech Consulting Limited | Administrative & support | 2022 |
| Zortek Limited | Hospitality | 2024 |
| Zuma Creative Services Limited | Professional & scientific | 2019 |
| ZUR Limited | Health & social care | 2009 |
| Zyntex Ltd | Professional & scientific | 2026 |