| YEW Tree Energy Ltd | Construction | 2024 |
| YEW Tree Renovations Limited | Real estate | 2025 |
| YF Horizon Group Ltd | Wholesale & retail | 2025 |
| Yidello Limited | Wholesale & retail | 2024 |
| YIN Property Group Ltd | Real estate | 2025 |
| YIP Shing Ltd | Wholesale & retail | 2005 |
| YOB Health & Fitness Ltd | Wholesale & retail | 2025 |
| Yomo Medical Limited | Health & social care | 2018 |
| Yorke Homes Limited | Construction | 1999 |
| Youmattersolutions Limited | Hospitality | 2025 |
| Young Gloucestershire Limited | Other services | 1981 |
| Youngman Therapy Limited | Professional & scientific | 2022 |
| Your Bigger Future Ltd | Professional & scientific | 2023 |
| Your Cleaning Eagles Ltd | Administrative & support | 2025 |
| Your Local Plumbing & Heating Ltd | Construction | 2021 |
| Your Marketing Partner Limited | Professional & scientific | 2017 |
| Your Marketing Solutions Ltd. | Professional & scientific | 2018 |
| Your Model Trucks Limited | Other services | 2025 |
| Your Mortgage Services Ltd | Financial services | 2016 |
| Your Next Move YNM CIC | Arts & recreation | 2015 |
| Your Prescriber Ltd | Administrative & support | 2024 |
| Your Tribute Limited | Information & communication | 2015 |
| Your Way Home Help Agency Ltd | Administrative & support | 2018 |
| Your World Consulting Limited | Administrative & support | 2023 |
| Yourway Food Ltd | Hospitality | 2025 |
| Yousefi Limited | Wholesale & retail | 2016 |
| Youth Academy Limited | Arts & recreation | 2012 |
| YT Property Services Ltd | Households | 2023 |
| Yueji Commerce Limited | Wholesale & retail | 2026 |
| Yuen & Co Limited | Real estate | 2023 |
| Yume Vision Ltd | Health & social care | 2025 |
| Yurlinked Limited | Professional & scientific | 2023 |
| YZH Consultancy Ltd | Health & social care | 2022 |
| Z & K Corporate Ltd | Hospitality | 2017 |
| Z & K Exeter Ltd | Hospitality | 2020 |
| Z & K Gloucester Ltd | Hospitality | 2018 |
| Z & K Hot Food Ltd | Hospitality | 2017 |
| Z & K Property Investments Ltd | Real estate | 2021 |
| Z & K Quality Foods Ltd | Hospitality | 2017 |
| Z & K Southwest Ltd | Hospitality | 2018 |
| Z&K Bolton Ltd | Hospitality | 2022 |
| Z&K Bunsik Holding Ltd | Hospitality | 2026 |
| Z&K Cornwall Food Ltd | Hospitality | 2019 |
| Z&K Coventry Ltd | Hospitality | 2022 |
| Z&K Dorset Ltd | Hospitality | 2025 |
| Z&K Fresh Tea Ltd | Hospitality | 2022 |
| Z&K Gourmet Foods Ltd | Hospitality | 2018 |
| Z&K Group Ltd | Financial services | 2021 |
| Z&K Holdings Ltd | Hospitality | 2024 |
| Z&K Hot Drinks Ltd | Hospitality | 2025 |
| Z&K Kaspas Desserts Ltd | Hospitality | 2023 |
| Z&K Koreanfood Ltd | Hospitality | 2026 |
| Z&K Manchester Ltd | Hospitality | 2021 |
| Z&K MK Ltd | Hospitality | 2025 |
| Z&K Northampton Ltd | Hospitality | 2020 |
| Z&K Partners Ltd | Hospitality | 2019 |
| Z&K Plymouth Ltd | Hospitality | 2019 |
| Z&K Refreshment Ltd | Hospitality | 2022 |
| Z&K South Ltd | Hospitality | 2021 |
| Z&K Swindon Ltd | Hospitality | 2022 |
| Z&K Worcester Ltd | Hospitality | 2021 |
| Z&S Online Store Ltd | Wholesale & retail | 2025 |
| Z&S Ventures Ltd | Financial services | 2020 |
| Zada Optical Care Limited | Health & social care | 2021 |
| Zada Property Group Limited | Real estate | 2021 |
| ZAH Innovation Ltd | Administrative & support | 2025 |
| ZAK Foods Ltd | Hospitality | 2023 |
| Zamust Ltd | Wholesale & retail | 2020 |
| ZAP Trading Ltd | Wholesale & retail | 2016 |
| Zapkam Limited | Wholesale & retail | 2007 |
| Zawadzki Optics Ltd | Wholesale & retail | 2021 |
| Zayn Productions Ltd | Information & communication | 2025 |
| Zaynab ALI Ltd | Wholesale & retail | 2024 |
| ZEB Nawaz Equine Consultancy Ltd | Professional & scientific | 2023 |
| Zed-S Services Ltd | Arts & recreation | 2019 |
| Zeiue Limited | Health & social care | 2022 |
| Zello Limited | Professional & scientific | 2008 |
| ZEN Property Maintenance Ltd | Construction | 2023 |
| Zenetmanny Property Ltd | Real estate | 2023 |
| Zenon Associates Limited | Professional & scientific | 2012 |
| Zenv Garden Ltd | Hospitality | 2022 |
| Zephyrus Consultants LLP | | 2019 |
| Zero Residue Carpet Cleaning Ltd | Other services | 2022 |
| Zetra AI Limited | Information & communication | 2026 |
| Zeus Global Property Management Ltd | Real estate | 2022 |
| Zeus Rentals Ltd | Real estate | 2024 |
| Zeus Security Ltd | Arts & recreation | 2020 |
| Zeylan Property Limited | Real estate | 2025 |
| Zeynep Selvi Limited | Hospitality | 2018 |
| Zishan & Brothers Ltd | Wholesale & retail | 2025 |
| Zivax Limited | Wholesale & retail | 2026 |
| Zizye Ltd | Wholesale & retail | 2022 |
| ZM Thunder Motor UK Ltd | Wholesale & retail | 2025 |
| Zmart Hohm Limited | Construction | 2019 |
| Zoe’S Mortgage Co Ltd | Financial services | 2026 |
| Zoltan Property Services Ltd | Construction | 2026 |
| Zone Web Services Ltd | Information & communication | 2023 |
| Zota Construction Ltd | Construction | 2024 |
| ZP Plumbing and Heating Ltd | Construction | 2025 |
| ZP Rentals Ltd | Households | 2026 |