| Zion Accountants & Consultants Ltd | Professional & scientific | 2021 |
| Zion Cleaning Management Services Ltd | Administrative & support | 2022 |
| Zion Construction & Management Ltd | Construction | 2021 |
| Zion Sports Synergy Management and Consultancy Limited | Arts & recreation | 2025 |
| Zion Structured Cabling Limited | Construction | 2017 |
| Zippys Day Nursery Limited | Health & social care | 2012 |
| Zita Management (UK) Ltd | Real estate | 2014 |
| ZJ Contractors Ltd | Professional & scientific | 2018 |
| ZJ Whales Limited | Wholesale & retail | 2025 |
| ZJD Limited | Real estate | 2023 |
| ZK Investments Limited | Real estate | 2015 |
| Zlaser&Services Ltd | Other services | 2023 |
| ZM Holding Ltd | Real estate | 2026 |
| ZNK Entertainment Ltd | Wholesale & retail | 2012 |
| ZNS Construction Limited | Construction | 2016 |
| Zocarein Properties Ltd | Real estate | 2025 |
| Zodiak Homecare Services Limited | Health & social care | 2026 |
| ZOE Bell Nutrition Limited | Professional & scientific | 2026 |
| ZOM Consulting Limited | Information & communication | 2014 |
| Zonecrew Ltd | Construction | 2021 |
| Zonia Essentials Ltd | Wholesale & retail | 2026 |
| Zoomies LAB Ltd | Information & communication | 2026 |
| Zoonance Ltd | Financial services | 2022 |
| Zooves Ltd | Wholesale & retail | 2020 |
| Zorfsc Ltd | Professional & scientific | 2019 |
| Zotefoams International Limited | Professional & scientific | 1992 |
| Zotefoams Pension Trustees Limited | Extraterritorial | 2012 |
| Zotefoams Technology Limited | Extraterritorial | 2014 |
| Zotefoams U.K. Limited | Administrative & support | 2013 |
| Zotefoams Vietnam Holdings UK Limited | Administrative & support | 2026 |
| Zozo Banqueting Limited | Hospitality | 2019 |
| ZRA Instruments Limited | Wholesale & retail | 2021 |
| ZS Cabling Ltd | Construction | 2021 |
| ZS Connect Ltd | Construction | 2025 |
| ZT Circle Ltd | Hospitality | 2022 |
| Zukko Limited | Real estate | 2025 |
| Zuko Construction Ltd | Construction | 2026 |
| Zumi Entertainment Ltd | Arts & recreation | 2024 |
| Zygo Communications Limited | Information & communication | 2008 |
| Zylo Consulting Ltd | Information & communication | 2026 |
| Zynq Ventures Ltd | Information & communication | 2024 |
| Zyra Techy Ltd | Information & communication | 2025 |
| ZYS London Ltd | Construction | 2021 |
| Zzjimi Ltd | Information & communication | 2018 |
| ZZZ Distribution Limited | Transport & logistics | 2024 |
| [AI] Infiniti Limited | Information & communication | 2018 |
| Épicé Studios Ltd | Arts & recreation | 2026 |
| Ìyámi Limited | Manufacturing | 2025 |