| Xflow Ltd | Administrative & support | 2023 |
| Xiria Ltd | Information & communication | 2013 |
| Xlon Limited | Construction | 2018 |
| XOD Ltd | Professional & scientific | 2023 |
| Xometry UK Ltd. | Information & communication | 2021 |
| Xorda Ltd | Information & communication | 2026 |
| Xpert Auto Limited | Construction | 2026 |
| XPLORE4 Technologies Limited | Information & communication | 2013 |
| Xponential Engineering Limited | Administrative & support | 2025 |
| Xpress CAD Services Limited | Administrative & support | 2011 |
| Xsrhythm Records Ltd | Extraterritorial | 2010 |
| Xtech Process Water Limited | Professional & scientific | 2020 |
| Xterior England Limited | Construction | 2021 |
| Xtream Ltd | Administrative & support | 2007 |
| Xtreme Nutrition North West Ltd | Wholesale & retail | 2020 |
| Xtrs Ltd | Construction | 2021 |
| Xychro Solutions Limited | Professional & scientific | 2019 |
| XYZ (Carlisle) Ltd | Construction | 2023 |
| XZ Solutions Ltd | Wholesale & retail | 2023 |
| Y & R Group Limited | Administrative & support | 2026 |
| Y Dream Limited | Real estate | 2021 |
| Y Electrical Solutions Ltd | Manufacturing | 2023 |
| Y Jackson Limited | Professional & scientific | 2018 |
| Y Route Consultancy Limited | Professional & scientific | 2018 |
| YA Express Logistics Ltd | Transport & logistics | 2024 |
| Yacoubian Architects Limited | Real estate | 2012 |
| Yalim Erkaya Design Limited | Administrative & support | 2016 |
| Yaman Global Diagnostics Ltd | Health & social care | 2022 |
| Yamas Brum Ltd | Hospitality | 2026 |
| Yamas SC Ltd | Hospitality | 2024 |
| YAN Logistics Limited | Transport & logistics | 2025 |
| Yana Tech Limited | Information & communication | 2017 |
| Yandery Limited | Education | 2011 |
| Yanel Farm Solar Limited | Construction | 2019 |
| Yantu Ltd | Information & communication | 2020 |
| Yaprak Events Limited | Hospitality | 2023 |
| Yaprak Leigh Limited | Hospitality | 2023 |
| Yarra Braes Consulting Limited | Professional & scientific | 2015 |
| Yasha Khesed Healthcare Limited | Administrative & support | 2023 |
| Yasin Tech Ltd | Administrative & support | 2026 |
| Yates Bros Ltd | Construction | 2011 |
| Yato Consulting Ltd | Administrative & support | 2025 |
| Yatta Entertainment Ltd | Arts & recreation | 2026 |
| YAW Drone Ltd | Professional & scientific | 2022 |
| YB Civils Limited | Administrative & support | 2015 |
| YB Events Holdings Limited | Financial services | 2025 |
| YB Events Limited | Hospitality | 2025 |
| YC2 Ltd | Hospitality | 2025 |
| Yebo Consultants Limited | Administrative & support | 2015 |
| Yedaiah Limited | Information & communication | 2015 |
| Yellow and Purple Limited | Real estate | 2022 |
| Yellow Beak Marketing Limited | Real estate | 2014 |
| Yellow Tree Crafts Ltd | Arts & recreation | 2019 |
| YES 2 Logistics Ltd | Transport & logistics | 2025 |
| Yetis Property Limited | Real estate | 2022 |
| YEW Tree at Wimboldsley Ltd | Real estate | 2010 |
| YEW Tree Walk (Stourport) Limited | Real estate | 2020 |
| Yewbeck Investments Limited | Real estate | 2023 |
| Yews Solar Limited | Construction | 2025 |
| YH Training Ltd | Information & communication | 2025 |
| Yielders Limited | Financial services | 2015 |
| Yielders Property Management Ltd | Real estate | 2020 |
| Ying Consultancy Ltd | Professional & scientific | 2017 |
| YK AWA Limited | Administrative & support | 2023 |
| Ymbb Limited | Professional & scientific | 2013 |
| YMH Agro Ltd | Administrative & support | 2023 |
| YNZ Services Ltd | Transport & logistics | 2020 |
| Yofil Ltd | Administrative & support | 2016 |
| Yogi G and the Family Tree Ltd | Arts & recreation | 2025 |
| Yongala DOS Limited | Information & communication | 2020 |
| York Electrical Solutions Ltd | Construction | 2018 |
| Yorko Limited | Real estate | 2019 |
| Yosifov & Sons Ltd | Transport & logistics | 2020 |
| You&I Marketing Ltd | Professional & scientific | 2023 |
| Youbuyweshop.Com Ltd | Wholesale & retail | 2015 |
| Young Lives Psychology Limited | Education | 2023 |
| Young PPM Investments Limited | Real estate | 2017 |
| Young Punk Limited | Extraterritorial | 2015 |
| Young Warrington CIC | Information & communication | 2025 |
| Youngs Access Roofing Services Ltd | Construction | 2026 |
| Youngs Roofing & Scaffolding Contractors Ltd | Construction | 2017 |
| Youpharm Ltd | Health & social care | 2016 |
| Your Barber Warrington Ltd | Other services | 2025 |
| Your Brand Solutions Ltd | Manufacturing | 2017 |
| Your FD Resource Limited | Professional & scientific | 2018 |
| Your Golf Box Limited | Wholesale & retail | 2024 |
| Your Housing (Development) Limited | Real estate | 2014 |
| Your MAN About the House Ltd | Construction | 2012 |
| Your Pleasure Toys Ltd | Wholesale & retail | 2019 |
| Your Prime Recruitment Group Ltd | Financial services | 2022 |
| Your Prime Recruitment Ltd | Administrative & support | 2017 |
| Your Psychiatrist UK Ltd | Administrative & support | 2025 |
| Your Services AJC Ltd | Professional & scientific | 2023 |
| Your Time Counselling Limited | Health & social care | 2024 |
| Youth Counts Ltd | Information & communication | 2014 |
| Youyou XUE Limited | Hospitality | 2018 |
| YPP Consulting Ltd | Professional & scientific | 2024 |
| YR Hafan Limited | Real estate | 2014 |
| Ysgellog Wind Farm Limited | Energy | 2011 |
| YT Project Services Ltd | Professional & scientific | 2018 |