| Yorkshire Preserves Limited | Manufacturing | 2026 |
| Yorkshire Propertiez Ltd | Real estate | 2024 |
| Yorkshire PUB Equipment Ltd | Administrative & support | 2017 |
| Yorkshire Retail Ltd | Hospitality | 2012 |
| Yorkshire Rose Community Care Ltd | Health & social care | 2015 |
| Yorkshire Shopfronts Limited | Construction | 1998 |
| Yorkshire Trade Kitchens Rotherham Limited | Manufacturing | 2009 |
| Yorkshire Training Partnership Limited | Education | 2000 |
| Yorkshire Travel Ltd | Transport & logistics | 2016 |
| Yorkshire Travel Private Hire Ltd | Transport & logistics | 2025 |
| Yorkshire Water Features Limited | Manufacturing | 2009 |
| Yosemite UK Holdco Limited | Financial services | 2021 |
| Yoshe Nails Company Ltd | Other services | 2016 |
| YOU in Print Ltd | Arts & recreation | 2010 |
| YOU SEE ME PPE Ltd | Wholesale & retail | 2020 |
| Youngs Interiors Limited | Construction | 2022 |
| Your Garden Solutions Ltd | Administrative & support | 2025 |
| Your Local Home Buyer Limited | Real estate | 2016 |
| Your Local Locksmith Limited | Other services | 2016 |
| Your Local Property Management Limited | Real estate | 2016 |
| Your Local Sales and Lettings Limited | Real estate | 2016 |
| Your New Ride Ltd | Wholesale & retail | 2023 |
| Your Textiles Ltd | Wholesale & retail | 2020 |
| Your Time, Your Choice CIC | Education | 2025 |
| Your Way Home Ltd | Real estate | 2026 |
| Yourcare Support Service Ltd | Health & social care | 2012 |
| Yourlink Limited | Manufacturing | 2007 |
| Yours Basket Ltd | Wholesale & retail | 2026 |
| Yourspotlight Creative Media Ltd | Professional & scientific | 2025 |
| Yourtime.Is Ltd | Wholesale & retail | 2013 |
| Yousaf Property Ltd | Households | 2023 |
| Yousaf Rehman Ltd | Health & social care | 2021 |
| Youth Work Works Limited | Health & social care | 2014 |
| Youtrack Ltd | Information & communication | 2025 |
| YPO Ltd | Transport & logistics | 2021 |
| Yscale Ltd | Administrative & support | 2019 |
| Yudale Limited | Other services | 2023 |
| Yugen Explore Limited | Manufacturing | 2017 |
| Yuha Property Limited | Real estate | 2025 |
| Yummy Chinese Takeaway Ltd | Hospitality | 2017 |
| Yummy Doncaster Limited | Hospitality | 2023 |
| Yummy Wath Limited | Hospitality | 2025 |
| Yumytasty Limited | Hospitality | 2025 |
| Yuna Digital Ltd | Professional & scientific | 2023 |
| Yusufamaya Limited | Health & social care | 2025 |
| Ywbs Ltd | Hospitality | 2025 |
| Z & B Property Ltd | Real estate | 2025 |
| Z & R Car Sales Ltd | Wholesale & retail | 2021 |
| Z a Property Solutions Limited | Real estate | 2004 |
| Z&A Developments Ltd | Construction | 2018 |
| Z&Z Check Ltd | Transport & logistics | 2025 |
| ZA Corporation Ltd | Wholesale & retail | 2011 |
| ZAA Property Management Ltd | Real estate | 2024 |
| Zaaila Logistics Ltd | Transport & logistics | 2023 |
| Zacbiggie Ltd. | Hospitality | 2016 |
| Zacetta Flooring Ltd | Construction | 2026 |
| Zafran Limited | Hospitality | 2015 |
| ZAG (UK) Limited | Extraterritorial | 1994 |
| Zamax Enterprises Limited | Real estate | 2016 |
| ZAP Properties Ltd | Administrative & support | 2016 |
| Zapnax Limited | Manufacturing | 2016 |
| ZAR Security Services Ltd | Administrative & support | 2024 |
| Zarden Limited | Other services | 2020 |
| Zayan Developments Ltd | Construction | 2019 |
| Zayn Properties Ltd | Real estate | 2020 |
| ZD Administrative Services Ltd | Health & social care | 2022 |
| ZD Kinetics Ltd | Transport & logistics | 2022 |
| ZD Support Services Ltd | Health & social care | 2022 |
| ZDR Lory Ltd | Transport & logistics | 2025 |
| Zdrowy Brzuch Magdalena Zdziechowska Ltd | Education | 2026 |
| ZDW Limited | Professional & scientific | 2025 |
| Zeanti Property Investments Ltd | Real estate | 2026 |
| ZEB Ventures Limited | Wholesale & retail | 2025 |
| Zees Kitchenuk Limited | Hospitality | 2024 |
| Zegel Limited | Professional & scientific | 2021 |
| Zeifion Consulting Limited | Administrative & support | 2011 |
| Zelda Optics Limited | Health & social care | 2025 |
| ZEN C R Staffing Ltd | Administrative & support | 2025 |
| Zenith Health Management Limited | Health & social care | 2023 |
| Zeon Teamwear Limited | Wholesale & retail | 2010 |
| Zero DRY Time SME Ltd | Wholesale & retail | 2022 |
| Zero to Hero Competitions Ltd | Arts & recreation | 2025 |
| ZG Music Distribution Limited | Wholesale & retail | 2025 |
| ZHN Ltd | Wholesale & retail | 2025 |
| ZHR Group Limited | Wholesale & retail | 2024 |
| Ziex Ltd | Administrative & support | 2025 |
| ZIG ZAG Media Limited | Professional & scientific | 2022 |
| Zigsoft Ltd | Information & communication | 2016 |
| Zilldam Global Limited | Transport & logistics | 2021 |
| Zindi Ltd | Transport & logistics | 2021 |
| Zing Consult Ltd | Financial services | 2020 |
| Zion Property Ltd | Real estate | 2018 |
| Zippi Ltd | Wholesale & retail | 2026 |
| Zirqa Properties Limited | Real estate | 2021 |
| ZJM Property Management Ltd | Real estate | 2024 |
| ZLM Brickwork Limited | Construction | 2024 |
| ZND (UK) Limited | Manufacturing | 1997 |
| ZND Technical Services Ltd | Construction | 2018 |
| ZOE Grace Estates Ltd | Hospitality | 2025 |
| ZOE Greenwood Mortgage Services Limited | Financial services | 2024 |