| Xavier Johvan Bespoke Ltd | Manufacturing | 2025 |
| Xbtrx Limited | Households | 2024 |
| XC Events Ltd | Administrative & support | 2026 |
| XC Solutions Limited | Information & communication | 2025 |
| Xcel Kitchens UK Limited | Manufacturing | 2014 |
| Xcel Property Group Ltd | Real estate | 2022 |
| Xcel Sports Ltd | Arts & recreation | 2022 |
| Xclusiv Detailing & Customs Ltd | Administrative & support | 2024 |
| Xclusive AV Ltd | Manufacturing | 2021 |
| Xclusive Ents Ltd | Arts & recreation | 2025 |
| XDV Datavault Ltd | Information & communication | 2026 |
| Xeagle Ltd | Transport & logistics | 2024 |
| XEC Travelz Ltd | Transport & logistics | 2018 |
| Xencare Ltd | Administrative & support | 2025 |
| Xeno Recruitment Limited | Administrative & support | 2025 |
| Xenon Bulbs Ltd | Wholesale & retail | 2013 |
| Xenon Lights Ltd | Wholesale & retail | 2022 |
| Xenonz UK Ltd | Wholesale & retail | 2014 |
| Xenotek Health Solutions Ltd | Health & social care | 2024 |
| Xensupport Limited | Health & social care | 2022 |
| Xentro Accounting Ltd | Professional & scientific | 2025 |
| Xeogan Social Enterprises Ltd | Professional & scientific | 2025 |
| XEP Ltd | Construction | 2025 |
| XIX Ltd | Arts & recreation | 2020 |
| Xixlabs Ltd | Information & communication | 2024 |
| Xjez Beauty Limited | Wholesale & retail | 2025 |
| XL Building Services Limited | Construction | 2010 |
| Xline Mobiles Ltd | Wholesale & retail | 2022 |
| Xomo Ltd | Transport & logistics | 2017 |
| Xperience IT Limited | Information & communication | 2014 |
| Xpert Trader Ltd | Wholesale & retail | 2026 |
| Xpress Dining Ltd | Manufacturing | 2018 |
| Xpressgo Logistics Ltd | Transport & logistics | 2025 |
| Xroute Logistics Ltd | Transport & logistics | 2026 |
| Xtras Casting Agency Ltd | Administrative & support | 2024 |
| Xtreme Bikes Ltd | Wholesale & retail | 2023 |
| Xtreme Goole Ltd | Other services | 2019 |
| Xtreme Mansfield Ltd | Other services | 2019 |
| Xtreme Newark Ltd | Other services | 2019 |
| Xtreme Retford Ltd | Wholesale & retail | 2024 |
| Xtremedevs Limited | Information & communication | 2016 |
| Xystus Limited | Wholesale & retail | 2017 |
| XÉN Pilates Ltd | Arts & recreation | 2025 |
| Y D Holdings Group Ltd | Real estate | 2020 |
| Y HAQ Healthcare Limited | Health & social care | 2013 |
| Y MAG Project 1 Ltd | Construction | 2021 |
| Y Property Limited | Administrative & support | 2013 |
| Y.E.S (Bradford) Ltd | Wholesale & retail | 2023 |
| Y.H.Shah Consulting Ltd | Professional & scientific | 2026 |
| YA & Co Solicitors Limited | Professional & scientific | 2014 |
| YA Consultancy Services Ltd. | Financial services | 2015 |
| YA Holdings Ltd | Financial services | 2018 |
| Yaadgaar Bakeries Group Limited | Extraterritorial | 2017 |
| Yaadgaar Bakeries Limited | Manufacturing | 2008 |
| Yaadgaar Franchise Limited | Financial services | 2020 |
| Yaadgaar Holding Limited | Financial services | 2020 |
| Yaadgaar Investment Limited | Real estate | 2020 |
| Yaadgaar Ltd | Extraterritorial | 2014 |
| Yaadgaar Operations Limited | Administrative & support | 2020 |
| Yaadgaar Shops Ltd | Financial services | 2020 |
| Yaadgaar Trade Limited | Manufacturing | 2020 |
| Yaadgaar Wholesale Limited | Manufacturing | 2024 |
| Yaegar Motor Company Ltd | Wholesale & retail | 2024 |
| Yahweh Gospel Music Ltd | Arts & recreation | 2025 |
| Yahya Wholesale Limited | Wholesale & retail | 2025 |
| Yakiyakiboom Ltd | Hospitality | 2025 |
| YAM 110 Limited | Health & social care | 2017 |
| YAM Cart Ltd | Wholesale & retail | 2026 |
| YAM Dairy Limited | Wholesale & retail | 2013 |
| YAM Spice Foods Limited | Hospitality | 2019 |
| Yamfurniture Limited | Wholesale & retail | 2022 |
| Yani Properties Ltd | Real estate | 2025 |
| Yaqub Restaurant Limited | Hospitality | 2025 |
| Yara Fitness Ltd | Other services | 2026 |
| Yara Jaga Ltd | Wholesale & retail | 2018 |
| Yara Supermarket 15 Ltd | Wholesale & retail | 2025 |
| Yarm Roofing & Upvc Roofline Ltd | Construction | 2024 |
| Yarns International Ltd | Extraterritorial | 1972 |
| YAS Services Ltd | Information & communication | 2017 |
| Yasar Baig Ltd | Information & communication | 2013 |
| Yasar Khalil Ltd | Transport & logistics | 2025 |
| Yasco Couriers Ltd | Transport & logistics | 2018 |
| Yaseen Transport Ltd | Transport & logistics | 2023 |
| Yaser Nazir Ltd | Health & social care | 2014 |
| Yash Commerce Ltd | Wholesale & retail | 2026 |
| Yasin & Sons Legal Solutions Ltd | Professional & scientific | 2019 |
| Yasin Distribution Ltd | Transport & logistics | 2025 |
| Yasin NAS Omar Courier Ltd | Transport & logistics | 2025 |
| Yaskahn Ltd | Wholesale & retail | 2023 |
| Yasmin Azam Ltd | Financial services | 2018 |
| Yateholm Management Ltd | Households | 2024 |
| YB Interiors Ltd | Manufacturing | 2023 |
| YB Supported Accommodation Ltd | Hospitality | 2025 |
| YBA Limited | Financial services | 2013 |
| YBH Consultants Ltd | Information & communication | 2018 |
| YBHS5 Ltd | Households | 2022 |
| YBS Group Limited | Extraterritorial | 2015 |
| YBS Limited | Extraterritorial | 1991 |
| YBS Marketing Services Limited | Manufacturing | 2017 |
| YBS Pension Trustees Limited | Financial services | 2018 |