| UK Wanli Eaglel Ubricating OIL Technology Co., Ltd | Mining & quarrying | 2024 |
| UK Watertherm Pipe Industry Technology Co., Limited | Wholesale & retail | 2020 |
| UK Watford Biotechnology Co., Limited | Extraterritorial | 2014 |
| UK WDI Agriculture Co., Ltd | Extraterritorial | 2020 |
| UK Web Solution Limited | Information & communication | 2017 |
| UK Weike Group IM & EX Co., Limited | Extraterritorial | 2026 |
| UK Weinong Technology Limited | Manufacturing | 2024 |
| UK Weixinsuoyu Int'L Ltd. | Extraterritorial | 2019 |
| UK Weiyang Trading Limited | Energy | 2021 |
| UK Wensha International Ltd | Extraterritorial | 2024 |
| UK Wesley Industry Co., Limited | Manufacturing | 2025 |
| UK Wessenke Electric Co., Ltd. | Manufacturing | 2023 |
| UK WIN Grace Personal Care Products Co., Ltd | Wholesale & retail | 2024 |
| UK Wobote International Group Co., Ltd. | Extraterritorial | 2020 |
| UK Woerwo Microbial Bacteria Fertilizer Ltd | Extraterritorial | 2025 |
| UK Woke International Chemical Industry Group Ltd | Extraterritorial | 2024 |
| UK Wokesi Group Chymistry Fertilizer Ltd | Extraterritorial | 2023 |
| UK Wolude Chemical Industry Group Ltd | Extraterritorial | 2025 |
| UK Wotaisen Chemical Co., Ltd | Mining & quarrying | 2024 |
| UK Ydin Fashion Group Limited | Manufacturing | 2025 |
| UK Yierfu Mining Group Shares Co., Limited | Extraterritorial | 2015 |
| UK Yikangmu Agricultural Group Co., Ltd. | Extraterritorial | 2020 |
| UK Yingfei Crop Science Ltd | Extraterritorial | 2021 |
| UK Yinggeshengnuo International Biology Engineering Ltd | Extraterritorial | 2024 |
| UK Yinghuang Import & Export Trade Ltd | Extraterritorial | 2024 |
| UK Yinglilai Group Ltd | Extraterritorial | 2023 |
| UK Yingmanke International Chymistry Engineering Group Ltd | Extraterritorial | 2020 |
| UK Yingqiao Valve Energy Saving Equipment Share Ltd | Manufacturing | 2022 |
| UK Yingrui International Agriculture Co., Limited | Mining & quarrying | 2021 |
| UK Yingst International Group Co., Ltd | Extraterritorial | 2023 |
| UK Yinlian Shenghua Life and Health Limited | Wholesale & retail | 2024 |
| UK Yizhang International Cultural Media Limited | Wholesale & retail | 2024 |
| UK Yonex Limited | Wholesale & retail | 2022 |
| UK Yongyue Co., Ltd | Extraterritorial | 2024 |
| UK Youbeifeng Crop Nutrition Trade Ltd | Extraterritorial | 2019 |
| UK Youmaosheng Chemcial Ltd | Extraterritorial | 2023 |
| UK Yousifu Biology Nutrition Ltd | Extraterritorial | 2024 |
| UK YU Hang Shipping Services Co., Limited | Manufacturing | 2023 |
| UK Yuanzhen International Holdings Ltd | Extraterritorial | 2024 |
| UK Yumi Biological Group Co., Ltd | Wholesale & retail | 2024 |
| UK Yuxi Crop Protection Ltd | Extraterritorial | 2022 |
| UK Yuyuan Art and Culture Media Co., Ltd. | Extraterritorial | 2019 |
| UK Zaag Group Limited | Extraterritorial | 2025 |
| UK Zhencheng International Holdings Ltd | Extraterritorial | 2024 |
| UK Zhonghe Lnternational Ltd | Administrative & support | 2022 |
| UK Ziya Investment Brand Holding Co., Ltd | Extraterritorial | 2022 |
| UK ZOE Tree Trade Ltd | Manufacturing | 2020 |
| UK Zuishe International Co., Ltd | Extraterritorial | 2020 |
| Uk.Ybzf. Ltd | Extraterritorial | 2019 |
| Ukglasgow Emilia Group Limited | Manufacturing | 2024 |
| Uknewera Co., Ltd. | Wholesale & retail | 2020 |
| UKT Group Co., Ltd. | Extraterritorial | 2019 |
| UL Digital (UK) Technology Co., Limited | Information & communication | 2025 |
| Ulay Smart Technologies Limited | Information & communication | 2026 |
| Ulley Consultants Limited | Administrative & support | 2005 |
| Ultima Genomics Limited | Extraterritorial | 2024 |
| Ultimo Lighting Limited | Extraterritorial | 2017 |
| ULTRADING2 Ltd | Wholesale & retail | 2022 |
| Unbing UK Ltd | Information & communication | 2024 |
| Uncommonthread Linens Ltd | Wholesale & retail | 2025 |
| Unfunnu Limited | Hospitality | 2018 |
| Uni-Taylor Bestmark Limited | Wholesale & retail | 2023 |
| Unico Auto Parts Limited | Manufacturing | 2018 |
| Unified UK Group Ltd | Other services | 2024 |
| Unifine Enterprise Co., Limited | Extraterritorial | 2018 |
| Unimax International Limited | Wholesale & retail | 2018 |
| Unimax Tyre Limited | Wholesale & retail | 2024 |
| Uninova International Industrial Co., Limited | Wholesale & retail | 2012 |
| Uniocean Holding UK Co., Ltd | Professional & scientific | 2018 |
| Union Foods and Chemicals Enterprise Ltd | Professional & scientific | 2015 |
| Union Harbour UK Limited | Wholesale & retail | 2026 |
| Union Household Limited | Wholesale & retail | 2024 |
| Union International Industrial Limited | Extraterritorial | 2014 |
| Union Scientific Instruments Ltd | Extraterritorial | 2016 |
| Union WIN Housewares Co ., Ltd | Manufacturing | 2021 |
| Unionstar Industrial Co., Limited | Wholesale & retail | 2020 |
| Uniproma Co., Limited | Extraterritorial | 2021 |
| Uniqualis Manufactory Ltd | Manufacturing | 2015 |
| Unique Eyes Ltd | Information & communication | 2021 |
| Unique Radiant Pretty (URP) Ltd | Wholesale & retail | 2021 |
| Uniroute Global Ltd | Wholesale & retail | 2025 |
| Unisoft Holdings Limited | Manufacturing | 2020 |
| United International Education Ltd | Education | 2024 |
| United Kingdom Dofee Cat Pet Food Research Co., Ltd | Extraterritorial | 2022 |
| United Maritime Ltd | Manufacturing | 2024 |
| United Well Development Limited | Extraterritorial | 2014 |
| Unitedchaintech Ltd | Information & communication | 2021 |
| Universal Brand Studio Ltd | Extraterritorial | 2020 |
| Universal Smart Limited | Extraterritorial | 2021 |
| Universky Stores Service Co., Limited | Manufacturing | 2023 |
| Uniwell Circuits Limited | Extraterritorial | 2010 |
| Uniwin Chem Co., Ltd | Professional & scientific | 2018 |
| Unlock Equity Limited | Extraterritorial | 2024 |
| Unstoppable Potential Ltd | Health & social care | 2024 |
| Uogo Co., Ltd | Extraterritorial | 2017 |
| UP Down Left Right Manufacturing Co., Ltd | Extraterritorial | 2022 |
| UPC Norton Invetment Limited | Financial services | 2024 |
| Upjv Limited | Information & communication | 2012 |
| Uplift Parts Co., Ltd | Extraterritorial | 2022 |
| Upnatek Electric Technology Co., Ltd | Manufacturing | 2020 |