| Xinqi Technology Ltd | Information & communication | 2025 |
| Xinsheng Import and Export Co., Ltd | Other services | 2021 |
| Xinyi Textile Co., Ltd | Extraterritorial | 2022 |
| Xinyuanhang Metal Co., Ltd | Manufacturing | 2022 |
| Xinyun Technology Limited | Information & communication | 2024 |
| Xinzhouhai Shipping Co., Ltd | Manufacturing | 2019 |
| Xiongqi (Zhejiang) Supply Chain Management Co., Ltd | Wholesale & retail | 2025 |
| Xissed Ltd | Information & communication | 2025 |
| Xizi Unite Elevator Co., Ltd. | Extraterritorial | 2013 |
| XJS Holdings Limited | Information & communication | 2026 |
| Xjtag Limited | Professional & scientific | 2003 |
| Xjtag Technical Services Limited | Information & communication | 2003 |
| Xkxair Ltd | Manufacturing | 2025 |
| XL Venture Ltd | Professional & scientific | 2015 |
| XLN Aviation Ltd | Manufacturing | 2023 |
| Xmeta Ltd | Professional & scientific | 2022 |
| Xmin IMP & EXP Co., Limited | Wholesale & retail | 2018 |
| XO Consulting Ltd | Professional & scientific | 2025 |
| XP Management Ltd. | Information & communication | 2023 |
| Xpertech Ltd | Construction | 2013 |
| Xplor Environmental Ltd | Professional & scientific | 2024 |
| Xqll Limited | Real estate | 2016 |
| XR Marine Service Co., Ltd | Extraterritorial | 2020 |
| Xsitu Ltd | Professional & scientific | 2019 |
| Xtrasio Technologies Ltd | Information & communication | 2020 |
| Xuchuang Trading Co., Ltd | Wholesale & retail | 2023 |
| Xuey Limited | Real estate | 2020 |
| Xuqi Associates Ltd | Professional & scientific | 2026 |
| XW3D Ltd | Manufacturing | 2024 |
| Xwatts Ltd | Information & communication | 2022 |
| XX BIO UK Limited | Professional & scientific | 2025 |
| Xyhai Trading Limited | Wholesale & retail | 2025 |
| Xylanta Limited | Information & communication | 2005 |
| Xylont Ltd | Information & communication | 2026 |
| Xyrho Limited | Professional & scientific | 2000 |
| Xyro Ltd | Wholesale & retail | 2026 |
| XYZ Fintech Limited | Information & communication | 2024 |
| XYZ Valve Group Co., Ltd. | Extraterritorial | 2012 |
| Y & R Realty 28 Ltd | Real estate | 2025 |
| Y K Development Management Limited | Construction | 2016 |
| Y K Developments Limited | Construction | 2010 |
| Y&G Limited | Professional & scientific | 2016 |
| Y&H Import & Export Co., Ltd | Wholesale & retail | 2021 |
| Y&X 2022 Ltd | Hospitality | 2022 |
| Y-Delta Ltd | Professional & scientific | 2026 |
| YA AME Ltd | Manufacturing | 2025 |
| Yacht Teak Carpentry Ltd | Manufacturing | 2025 |
| YAD Cutlery Ltd | Real estate | 2025 |
| YAD Hair Style Ltd | Other services | 2022 |
| Yadi Consulting Limited | Professional & scientific | 2013 |
| Yagro Ltd | Information & communication | 2015 |
| Yakasista Ltd | Information & communication | 2023 |
| Yakeley Associates Limited | Professional & scientific | 1993 |
| Yalin Limited | Hospitality | 2025 |
| YAN WU Medium Co., Ltd | Information & communication | 2025 |
| Yanchuks Removals Ltd | Transport & logistics | 2023 |
| Yang Chengfu TAI CHI Chuan Center United Kingdom | Extraterritorial | 1999 |
| Yang LU Ltd | Professional & scientific | 2020 |
| Yang's Industrial Company Limited | Extraterritorial | 2011 |
| Yangduozhen Global Trade Ltd | Wholesale & retail | 2024 |
| Yanman UK International Limited | Financial services | 2020 |
| Yansa Shop Limited | Wholesale & retail | 2025 |
| Yanya Media Ltd | Wholesale & retail | 2025 |
| Yaou Trading Co., Ltd | Wholesale & retail | 2023 |
| Yapwell Ltd | Real estate | 2018 |
| Yaqeen Hosting U.K Limited | Information & communication | 2019 |
| Yaqrit Discovery Limited | Professional & scientific | 2019 |
| Yaqrit Limited | Professional & scientific | 2012 |
| Yara Trading Co., Ltd | Wholesale & retail | 2021 |
| Yaran Crop Nutrition (UK) Group Co., Ltd | Extraterritorial | 2021 |
| Yasan Motor Limited | Extraterritorial | 2017 |
| Yaseen Omar Ltd | Manufacturing | 2024 |
| Yashi Industrial Co., Ltd | Extraterritorial | 2020 |
| Yasmin’S Gems Ltd | Manufacturing | 2022 |
| Yaxess Limited | Professional & scientific | 2009 |
| YAY FUN Ltd. | Information & communication | 2024 |
| Yayo Star Company Limited | Wholesale & retail | 2026 |
| YAZ Marine Limited | Other services | 2023 |
| Yazdanparast Ltd | Financial services | 2023 |
| Yazhe Auto Parts Co., Limited | Wholesale & retail | 2025 |
| Yazhuo Plastic Flooring (UK) Ltd | Manufacturing | 2023 |
| YB Barbers Ltd | Other services | 2025 |
| Ycob Limited | Real estate | 2021 |
| YD Effortless Excellence Limited | Professional & scientific | 2024 |
| Ydor Ltd | Professional & scientific | 2021 |
| Yeartouch Limited | Extraterritorial | 2017 |
| Yellow Door Holdings Ltd | Financial services | 2022 |
| Yellow Door Limited | Manufacturing | 2005 |
| Yellow DOT Management Limited | Professional & scientific | 2025 |
| Yellow Star Music Limited | Arts & recreation | 2006 |
| Yelooc Limited | Professional & scientific | 2023 |
| Yemtox Limited | Wholesale & retail | 2008 |
| Yenice Engineering Ltd | Mining & quarrying | 2021 |
| Yeoman Property Cambridge Limited | Real estate | 2020 |
| Yeqin Garment Limited | Wholesale & retail | 2024 |
| YES Chef Food Ltd | Hospitality | 2026 |
| YES Properties Investment Limited | Real estate | 2021 |
| Yeter Bozkurt Ltd | Hospitality | 2024 |
| Yeti Cat Ltd | Information & communication | 2022 |
| YEW House Limited | Health & social care | 2006 |