| Y&H Electrical Ltd | Construction | 2018 |
| Y&H Holdings Ltd | Construction | 2022 |
| Y&N Healthcare Ltd | Health & social care | 2026 |
| Y&S Founders Ltd | Real estate | 2024 |
| Y.D. Transport Ltd | Transport & logistics | 2019 |
| Y2C Quality Ltd | Professional & scientific | 2025 |
| Y2K Kidz Klub Limited | Education | 2004 |
| Y2K Kidz Klub UK Ltd | Health & social care | 2025 |
| Y700 Electronic Didtribution Limited | Wholesale & retail | 2026 |
| Y9PCG Drive Ltd | Administrative & support | 2017 |
| YA Enterprise Ltd | Wholesale & retail | 2026 |
| Yabbadabbadooby Ltd | Wholesale & retail | 2024 |
| Yaksal Estates Ltd | Real estate | 2024 |
| Yakub Aesthetics Ltd | Health & social care | 2022 |
| Yakub Gani Holdings Limited | Financial services | 2022 |
| Yalca Limited | Information & communication | 2026 |
| Yamedical Bolton Ltd | Health & social care | 2024 |
| Yapai Limited | Information & communication | 2026 |
| Yaqoob and Yaqoob Limited | Professional & scientific | 2016 |
| Yaqteen Health Ltd | Health & social care | 2021 |
| YARD8 Limited | Wholesale & retail | 2023 |
| Yardleys French Polishers & Upholsterers Ltd | Other services | 2018 |
| Yarro Ltd | Information & communication | 2025 |
| Yarrow (GRF) Limited | Real estate | 2022 |
| Yarrow (HC) Limited | Financial services | 2022 |
| Yarrow (PC) Limited | Real estate | 2022 |
| Yarrow (PM) Limited | Real estate | 2022 |
| Yars Consultancy Solutions Limited | Information & communication | 2025 |
| Yashfasohail Ltd | Wholesale & retail | 2025 |
| Yashfi Properties Ltd | Real estate | 2025 |
| Yasin Properties Limited | Real estate | 2025 |
| Yasin Shekhani Ltd | Information & communication | 2018 |
| Yasin Trading Co Ltd | Health & social care | 2023 |
| Yasir & Hashir Ltd | Wholesale & retail | 2020 |
| Yasmin Patel Ltd | Health & social care | 2003 |
| Yaspire Technologies Limited | Professional & scientific | 2024 |
| Yassini Pizza Ltd | Hospitality | 2025 |
| Yastabshiruna Binihmatin UK Murid Communities Federation CIC | Extraterritorial | 2021 |
| Yate Fold Farm Limited | Agriculture & fishing | 2003 |
| Yates Consultants Ltd | Manufacturing | 2026 |
| Yates Fabrication Limited | Manufacturing | 2012 |
| Yates Plumbing and Heating Ltd | Construction | 2014 |
| YB General Traders Ltd | Wholesale & retail | 2016 |
| YCC Group Ltd | Financial services | 2020 |
| YD Brands Ltd | Manufacturing | 2025 |
| YDC (NW) Ltd | Health & social care | 2023 |
| YDR Ltd | Wholesale & retail | 2026 |
| YDU Limited | Wholesale & retail | 2025 |
| Yeah Wholesale Ltd | Wholesale & retail | 2024 |
| YEH Online Ltd | Wholesale & retail | 2025 |
| Yellow Corner Shop Ltd | Wholesale & retail | 2024 |
| Yellowstone Rental Ltd | Real estate | 2025 |
| Yeltic Limited | Administrative & support | 2019 |
| Yemmies Kitchen Limited | Hospitality | 2024 |
| Yepa Limited | Information & communication | 2024 |
| YEW Tree Education Ltd | Education | 2025 |
| YEW Tree House Developments Limited | Construction | 2019 |
| YH Consultants Ltd | Professional & scientific | 2022 |
| YH JU Holding Limited | Financial services | 2025 |
| YH Realty & Construction Ltd | Construction | 2026 |
| YH Trading & Consultancy Co. Ltd | Professional & scientific | 2021 |
| YHG Sterling Stars Ltd | Wholesale & retail | 2025 |
| Yhjum Properties Limited | Real estate | 2025 |
| YI Mart UK Ltd | Wholesale & retail | 2023 |
| Yilmaz Property Group Ltd | Real estate | 2024 |
| Yince Snacks Ltd | Manufacturing | 2025 |
| Yingfa Ltd | Hospitality | 2026 |
| YJ Controls Ltd | Professional & scientific | 2018 |
| YK Products Limited | Wholesale & retail | 2025 |
| YKS Construction Ltd | Construction | 2022 |
| YM Group GB Limited | Wholesale & retail | 2025 |
| YM Law Ltd | Professional & scientific | 2019 |
| YM Optical Ltd | Health & social care | 2023 |
| YM Properties Ltd | Real estate | 2022 |
| YMH Sellers Ltd | Wholesale & retail | 2025 |
| YML Care Limited | Health & social care | 2014 |
| Ymsh Ltd | Health & social care | 2019 |
| YO Associates Ltd | Professional & scientific | 2022 |
| Yobah Holdco Limited | Information & communication | 2024 |
| Yochee Lanka Ltd | Wholesale & retail | 2025 |
| Yolo Leisure Limited | Hospitality | 2012 |
| Yopropertyuk Limited | Real estate | 2022 |
| Yordeli Limited | Wholesale & retail | 2021 |
| York House (Northwich) Management Limited | Real estate | 1988 |
| Yorke Holdings Limited | Professional & scientific | 2004 |
| Yorke Installations Limited | Administrative & support | 2009 |
| Yorkiepress Ltd | Wholesale & retail | 2025 |
| Yorkshire Aesthetic Solutions Limited | Other services | 2016 |
| Yorkshire Street Pharmacy Limited | Wholesale & retail | 2003 |
| Yorkshire Yogi Limited | Administrative & support | 2016 |
| Yotta Miles Ltd | Information & communication | 2016 |
| YOU Call WE Haul Ltd | Transport & logistics | 2025 |
| YOU Mart (Bolton) Ltd | Wholesale & retail | 2020 |
| Younas Anjum Ltd | Wholesale & retail | 2026 |
| Young Options Limited | Extraterritorial | 2009 |
| Youngs' PM Limited | Information & communication | 2016 |
| Younipad Limited | Financial services | 2008 |
| Your Care OUR Support Ltd | Public administration | 2023 |
| Your Care Recruitment Ltd | Administrative & support | 2022 |
| Your Choice Cover Ltd | Financial services | 2015 |