| XON Labs LLP | | 2026 |
| Xpedition Global Ltd | Professional & scientific | 2023 |
| Xpert Driver Training Ltd | Education | 2017 |
| Xpteach Ltd | Education | 2026 |
| Xsphere Computer Solutions LLP | | 2003 |
| Xtova Manuel Homes Ltd | Real estate | 2019 |
| Y Homes Limited | Real estate | 2008 |
| Y L Introductions Ltd | Other services | 2021 |
| Y&S (York) Limited | Hospitality | 2025 |
| Y&Sb Limited | Financial services | 2014 |
| Y&U Beauty Salon Ltd | Other services | 2018 |
| Y&Y Partners Ltd | Construction | 2021 |
| YAC Leeds Ltd | Health & social care | 2016 |
| YAC Pontefract Ltd | Health & social care | 2016 |
| Yacht Lighting Systems Ltd | Manufacturing | 2021 |
| Yagland Limited | Professional & scientific | 2024 |
| Yahala Mataam CIC | Hospitality | 2023 |
| Yaiza Limited | Professional & scientific | 2014 |
| Yakamoz York Limited | Hospitality | 2020 |
| YAKAMOZ55 York Ltd | Hospitality | 2025 |
| Yakout Ltd | Financial services | 2024 |
| Yakut Limited | Hospitality | 2017 |
| Yallingup Investment Properties Ltd | Real estate | 2025 |
| Yambits Group Limited | Financial services | 2024 |
| Yambits Limited | Wholesale & retail | 2009 |
| Yamco Limited | Arts & recreation | 1993 |
| Yan's Place Ltd | Hospitality | 2021 |
| Yan's Takeaway Ltd | Hospitality | 2026 |
| Yans Express Takeaway Ltd | Hospitality | 2021 |
| Yara Agri Limited | Extraterritorial | 2003 |
| Yara Chafer Limited | Extraterritorial | 2003 |
| Yara Fertilizers Limited | Extraterritorial | 2003 |
| Yara GAS and Chemicals Limited | Extraterritorial | 2003 |
| Yara Industrial Limited | Extraterritorial | 2004 |
| Yara International Limited | Extraterritorial | 2003 |
| Yara Limited | Extraterritorial | 2004 |
| Yara Overseas Limited | Professional & scientific | 1991 |
| Yara Phosyn Limited | Extraterritorial | 1971 |
| Yara Pocklington Limited | Extraterritorial | 2004 |
| Yara UK Limited | Manufacturing | 1999 |
| Yara UK Pension Trustee Limited | Extraterritorial | 2005 |
| Yaravita Limited | Extraterritorial | 2005 |
| Yarnold Growth Investments Ltd | Real estate | 2024 |
| Yates Lettings Limited | Professional & scientific | 2011 |
| Yavolo Holdco Limited | Financial services | 2024 |
| Yavolo Ltd | Wholesale & retail | 2020 |
| YBB Cleaning Ltd | Administrative & support | 2023 |
| Ybcm Designs Ltd | Wholesale & retail | 2014 |
| YBS Properties Ltd | Real estate | 2020 |
| YBS Trading Ltd | Construction | 2020 |
| YCE Limited | Manufacturing | 2020 |
| YD Building Ltd | Construction | 2025 |
| YD Investments Limited | Professional & scientific | 2000 |
| YD Letting Ltd | Real estate | 2024 |
| YD MSR Limited | Real estate | 2024 |
| YD Practice Limited | Health & social care | 2021 |
| Yearsley House RTM Company Limited | Households | 2020 |
| Yearsley Properties Ltd | Real estate | 2022 |
| Yelin Property Company Ltd | Real estate | 2024 |
| Yelland Psychology Services Limited | Professional & scientific | 2022 |
| Yellow Dog Holiday Lets Limited | Real estate | 2025 |
| Yellowhammer Ltd | Professional & scientific | 2010 |
| YEP Holdings Limited | Financial services | 2021 |
| YES Consultancy Ltd | Professional & scientific | 2021 |
| YES Education Consultancy Ltd | Education | 2015 |
| YES Plant Hire Limited | Construction | 2013 |
| Yeti Gurkha Limited | Hospitality | 2024 |
| Yetti Carebridge Services Ltd | Health & social care | 2026 |
| YEW Tree and Stable House (Aldwark) Management Company Limited | Households | 2020 |
| YEW Tree Gardens (Tuffley) Management Company Limited | Households | 2019 |
| YEW Tree Gardens Management Company Limited | Households | 2003 |
| Yewcourt Advisory Ltd | Professional & scientific | 2026 |
| YFC York Ltd | Hospitality | 2024 |
| YG Enterprises Ltd | Financial services | 2021 |
| YG Holding Ltd | Real estate | 2025 |
| YGO Productions Limited | Arts & recreation | 2023 |
| YHG Property Maintenance Ltd | Other services | 2023 |
| Yieldclear Limited | Households | 1986 |
| Yimu Group Limited | Hospitality | 2024 |
| Yingkeli Commerce Ltd | Wholesale & retail | 2026 |
| Yipshade Ltd | Real estate | 2024 |
| YKD Electrical Ltd | Construction | 2025 |
| YKD Properties Ltd | Real estate | 2026 |
| YKH Brass Monkey Limited | Arts & recreation | 2024 |
| YMF Car Parts Ltd | Wholesale & retail | 2019 |
| YMF Holdings Limited | Wholesale & retail | 2019 |
| YMG Acomb Medical Ltd | Health & social care | 2019 |
| YMG Properties Ltd | Real estate | 2016 |
| YNC (York) Ltd | Wholesale & retail | 2017 |
| YO Bakehouse (Wholesale) Limited | Financial services | 2022 |
| YO HA Drivers Limited | Administrative & support | 2015 |
| YO Health & Fitness Ltd | Arts & recreation | 2017 |
| Yo-Sy Property Limited | Construction | 2023 |
| YO1 Coffee Co Limited | Manufacturing | 2022 |
| YO1 Consulting Ltd | Professional & scientific | 2024 |
| YO1 Enterprises Ltd | Administrative & support | 2019 |
| YO1 Ltd | Real estate | 2025 |
| YO1 Radio Limited | Information & communication | 2017 |
| YO1 Upvc Solutions Limited | Manufacturing | 2015 |
| YO31 Bison Coffee Shop Limited | Hospitality | 2018 |