| Yonder Technology Ltd | Financial services | 2020 |
| York House Management Company (Northampton) Limited | Professional & scientific | 1983 |
| York Systems Ltd | Manufacturing | 2012 |
| Yorkshire and Humberside CDA Limited | Health & social care | 2008 |
| Yorkshire Fabrications Limited | Manufacturing | 1996 |
| Yorkshire Vehicle Movements Limited | Transport & logistics | 2017 |
| Yorksoft Limited | Information & communication | 2011 |
| Yorteck Limited | Professional & scientific | 2005 |
| YOU & ME Architecture Limited | Professional & scientific | 2015 |
| YOU Connect Ltd | Professional & scientific | 2009 |
| Youdent Ltd | Wholesale & retail | 2025 |
| Young Hearts Ltd | Health & social care | 2021 |
| Young Hearts SM Limited | Administrative & support | 2015 |
| Young People at Heart Limited | Health & social care | 2014 |
| Young's Property Agents Limited | Real estate | 2022 |
| Young's Property Lettings Limited | Real estate | 2025 |
| Youngsters Limited | Wholesale & retail | 2021 |
| Young’S Property Solutions Ltd | Hospitality | 2023 |
| Your and Store Ltd | Wholesale & retail | 2025 |
| Your Books Ltd | Professional & scientific | 2025 |
| Your Dentist in Ltd | Financial services | 2023 |
| Your Dentist in Thame Ltd | Health & social care | 2023 |
| Your Eleven Plus Ltd | Education | 2025 |
| Your Favourites Ltd | Hospitality | 2020 |
| Your Injury Matters Limited | Professional & scientific | 2007 |
| Your Inner Gorilla Ltd | Education | 2026 |
| Your Local Convenience Shop Limited | Wholesale & retail | 2022 |
| Your Loving Memory Ltd | Information & communication | 2022 |
| Your Next Chapter CIC | Education | 2026 |
| Your Payments Team Limited | Administrative & support | 2020 |
| Your Region Property Masters Ltd | Real estate | 2025 |
| Your Space Foundation CIC | Health & social care | 2024 |
| Your Style Tiles & Bathrooms Ltd | Administrative & support | 2021 |
| Your Words Interpreting & Translations Ltd | Professional & scientific | 2025 |
| Yousuf Properties Ltd | Real estate | 2025 |
| Yoyo Couriers Ltd | Transport & logistics | 2022 |
| YRC Health Ltd | Education | 2021 |
| Yrsb Cleaning Ltd | Administrative & support | 2025 |
| Yrsb Ltd | Arts & recreation | 2021 |
| Ysettle Limited | Manufacturing | 2021 |
| YSF Design Limited | Professional & scientific | 2013 |
| Yuga Invent Limited | Information & communication | 2022 |
| Yuill Assets Limited | Administrative & support | 2026 |
| Yuill Family Holdings Limited | Financial services | 2021 |
| Yuill Family Investments Limited | Financial services | 2021 |
| Yuill Family Properties Ltd | Hospitality | 2015 |
| Yuill Properties Limited | Households | 2018 |
| Yuill Realisations Limited | Financial services | 2021 |
| YUILL77 LLP | | 2024 |
| Yukiyuki Ltd | Wholesale & retail | 2020 |
| Yuliia Premium Shop Ltd | Wholesale & retail | 2024 |
| Yumas Buckton Ltd | Hospitality | 2023 |
| Yumas Kitchen Limited | Hospitality | 2020 |
| Yumas MK Limited | Hospitality | 2023 |
| Yung Marv Ltd | Arts & recreation | 2026 |
| Yuriy Ltd | Transport & logistics | 2017 |
| Yusen Logistics (UK) Limited | Transport & logistics | 1990 |
| Yuvaan Global Ltd | Wholesale & retail | 2023 |
| Yuvisota Ltd | Transport & logistics | 2019 |
| YVP Construction Ltd | Construction | 2025 |
| YW Lings Limited | Hospitality | 2025 |
| YYY Clothing Ltd | Wholesale & retail | 2019 |
| YZC Ltd | Hospitality | 2021 |
| Z & H Consultancy Services Limited | Professional & scientific | 2015 |
| Z Avenue Records Ltd | Information & communication | 2011 |
| Z Design UK Limited | Professional & scientific | 2005 |
| Z Essence Ltd | Wholesale & retail | 2026 |
| Z Sources Ltd | Wholesale & retail | 2024 |
| Z&D Invest Ltd | Real estate | 2023 |
| Z.D.Zhekov Transport Ltd | Wholesale & retail | 2023 |
| Z2 Enterprises Limited | Real estate | 2022 |
| Z2D Investments Limited | Extraterritorial | 2023 |
| Z5 Cars Ltd | Transport & logistics | 2018 |
| Zaara's Driving School Ltd | Education | 2025 |
| Zacarly Consulting Limited | Professional & scientific | 2024 |
| Zack Tradings Ltd | Wholesale & retail | 2024 |
| Zaeed Rahim Ltd | Health & social care | 2026 |
| ZAF Homes Ltd | Construction | 2020 |
| ZAF Homes Property Care Ltd | Construction | 2025 |
| Zafarnama Limited | Real estate | 2019 |
| Zahra Fashions Ltd | Wholesale & retail | 2020 |
| Zain Windows Ltd | Construction | 2026 |
| Zaintech Computing Ltd | Wholesale & retail | 2024 |
| Zainzuck Limited | Hospitality | 2012 |
| Zaiqa Foods Ltd | Hospitality | 2018 |
| Zakm Professionals Limited | Health & social care | 2023 |
| Zalewski Limited | Transport & logistics | 2015 |
| ZAM E-Commerce Trading Company Ltd | Information & communication | 2021 |
| ZAM ZAM Fresh Fish Shop Ltd | Wholesale & retail | 2020 |
| ZAM ZAM Halal Food Ltd | Wholesale & retail | 2018 |
| Zaman Associates Limited | Real estate | 2002 |
| Zaman Building Associates Limited | Construction | 2014 |
| Zamfir Florin Transport Limited | Transport & logistics | 2018 |
| Zamos Building Ltd | Construction | 2022 |
| Zamos Construction Ltd | Construction | 2018 |
| ZANDILE4 Limited | Health & social care | 2012 |
| Zane Healthcare Limited | Health & social care | 2020 |
| Zans Holdings Limited | Real estate | 2023 |
| ZAP EV Limited | Construction | 2021 |
| Zappa Limited | Extraterritorial | 2013 |