| Xoph Ltd | Manufacturing | 2025 |
| Xperime Limited | Administrative & support | 2009 |
| Xperts Properties Limited | Real estate | 2025 |
| Xpose Limited | Manufacturing | 2010 |
| Xquisite Brands (UK) Ltd | Other services | 2018 |
| Xsfinancial Ltd | Other services | 2013 |
| Xtech Solution Private Limited | Information & communication | 2012 |
| Xten Sports Ltd | Wholesale & retail | 2021 |
| XTI Pact Ltd. | Manufacturing | 2010 |
| Xtive Ltd | Wholesale & retail | 2025 |
| XTM Global Limited | Wholesale & retail | 2023 |
| Xtreme Security Specialists Ltd | Administrative & support | 2012 |
| Xtuning Ltd. | Manufacturing | 2015 |
| XXV Properties Limited | Real estate | 2018 |
| XYZ Sales Limited | Wholesale & retail | 2020 |
| Y & a Builders Ltd | Construction | 2024 |
| Y U F Developments Ltd | Real estate | 2026 |
| Y&K Healthcare Solutions Ltd | Administrative & support | 2024 |
| Y66KOB Properties Ltd | Real estate | 2025 |
| YA ALI Consultants Ltd | Professional & scientific | 2025 |
| YAD Maintenance Limited | Construction | 2024 |
| Yahway Homes Limited | Real estate | 2026 |
| Yahya Logistics Limited | Transport & logistics | 2025 |
| Yahya Property Limited | Real estate | 2026 |
| Yaia Hair Ltd | Wholesale & retail | 2016 |
| Yakub Group Holdings Ltd | Financial services | 2023 |
| YAM Motor Group Ltd | Wholesale & retail | 2026 |
| Yamaha Raptor (700R) Trading Ltd | Wholesale & retail | 2020 |
| Yamama Ltd | Wholesale & retail | 2026 |
| Yana by Hazera Ltd | Wholesale & retail | 2024 |
| Yane Foods Limited | Hospitality | 2021 |
| Yansco & Co LLP | | 2024 |
| Yansco Capital Limited | Real estate | 2021 |
| Yaqb Limited | Real estate | 2017 |
| Yari Fashion Ltd | Wholesale & retail | 2024 |
| Yarn Weaver Limited | Arts & recreation | 2025 |
| YAS International Limited | Wholesale & retail | 2017 |
| Yaseenislam Ltd | Transport & logistics | 2025 |
| Yasir Newsagents Ltd | Wholesale & retail | 2026 |
| Yasmin Enterprise Ltd | Real estate | 2021 |
| YASMINA1 Limited | Hospitality | 2022 |
| Yastraby Group Ltd | Professional & scientific | 2021 |
| Yaya's Bistro Limited | Hospitality | 2018 |
| YB20 Ltd | Construction | 2022 |
| Yearn Fabrications Limited | Manufacturing | 1997 |
| Yearpage Limited | Households | 1981 |
| Yearsley Legacy Limited | Financial services | 2019 |
| Yellow BEE Marketing Ltd | Professional & scientific | 2023 |
| Yelloway Coaches Limited | Transport & logistics | 1986 |
| Yelloway Motor Services Limited | Transport & logistics | 2007 |
| Yellowgrid Holdings Limited | Financial services | 2026 |
| Yellowgrid Limited | Information & communication | 2007 |
| YEM Holdings and Asset Management Ltd | Professional & scientific | 2025 |
| YEW Tree (Hucknall) Management Limited | Households | 2023 |
| YFC Original Yummy Fried Chicken Limited | Hospitality | 2022 |
| YFC Fried Chicken Ltd | Hospitality | 2018 |
| YFC Oldham Limited | Hospitality | 2026 |
| YIP & Sons Limited | Financial services | 2018 |
| YK Autoworx Ltd | Wholesale & retail | 2020 |
| YK Locums Ltd | Health & social care | 2019 |
| Ylbd Ltd | Construction | 2016 |
| YM Motors NW Ltd | Wholesale & retail | 2026 |
| YM Payroll Services Ltd | Professional & scientific | 2009 |
| YMG Global Link Limited | Wholesale & retail | 2023 |
| Yodatek Ltd | Information & communication | 2018 |
| Yogi News & OFF Licence Limited | Wholesale & retail | 2019 |
| Yogi's Training Hub Ltd | Other services | 2023 |
| York Food Street Limited | Hospitality | 2022 |
| Yorkshire Dales Cookery School Limited | Hospitality | 2018 |
| Yorkshire Paving & Landscapes Limited | Construction | 2018 |
| Yorkshire Pine Limited | Manufacturing | 1986 |
| Yorkshire Road Surfacing Limited | Construction | 2011 |
| Yorkshire Surfacing Limited | Construction | 2017 |
| YORKSHIRE153 Limited | Health & social care | 2019 |
| YOU Matter Saddleworth CIC | Other services | 2024 |
| Yougas Services Limited | Construction | 2023 |
| Youlearnt EDU Ltd | Education | 2024 |
| Youlearnt Ltd | Information & communication | 2022 |
| Youmee Limited | Other services | 2021 |
| Young Adventurers Childcare Ltd | Health & social care | 2025 |
| Younus Enterprises Ltd | Hospitality | 2025 |
| Your Cafe Limited | Manufacturing | 2020 |
| Your Choice Costumes Ltd | Wholesale & retail | 2021 |
| Your Choice Online Ltd | Wholesale & retail | 2021 |
| Your Fast Move Ltd | Wholesale & retail | 2015 |
| Your New Wardrobe Ltd | Wholesale & retail | 2024 |
| Your Software Limited | Information & communication | 2009 |
| Your Switch Ltd | Energy | 2025 |
| Yousaf Property Development Limited | Real estate | 2025 |
| Youth Empower Supported Accommodation Ltd | Health & social care | 2025 |
| YP Launderette Limited | Other services | 2026 |
| YSL Tyres Ltd | Manufacturing | 2023 |
| YT Properties Ltd | Real estate | 2017 |
| Yugenn Ltd | Financial services | 2019 |
| Yuinzo Trading Ltd | Wholesale & retail | 2024 |
| YUM Theory Ltd | Hospitality | 2025 |
| Yummy(Crawley) Ltd | Hospitality | 2016 |
| Yusafa Properties Ltd | Real estate | 2025 |
| Yusiana Holdings Limited | Financial services | 2024 |
| Yusuf Vali Limited | Health & social care | 2013 |