| UK Norfolk Mineral Organics Co., Ltd | Mining & quarrying | 2026 |
| UK Nuoweinifei Plant Regulation Limited | Wholesale & retail | 2024 |
| UK Oasis Ecological Materials Group Co., Ltd. | Manufacturing | 2024 |
| UK Opec Energy Co., Ltd | Extraterritorial | 2019 |
| UK Operations Ltd | Manufacturing | 2025 |
| UK Opus International Co., Ltd | Mining & quarrying | 2021 |
| UK Oriental Trading Ltd | Wholesale & retail | 2026 |
| UK Orochi Industries Limited | Wholesale & retail | 2023 |
| UK Ouman International Chemical Co., Ltd | Mining & quarrying | 2026 |
| UK Pfizer AB Enzyme Gene Factory Co., Ltd | Wholesale & retail | 2024 |
| UK Philos Biotechnology Co., Ltd | Mining & quarrying | 2026 |
| UK Pizza Equipment Ltd | Wholesale & retail | 2019 |
| UK Plant Science Center Limited | Extraterritorial | 2020 |
| UK Plantplum International Chemical Company Co., Ltd | Mining & quarrying | 2025 |
| UK Plantplump International Chemical Company Co., Ltd | Mining & quarrying | 2025 |
| UK Platinum Pillar Limited | Construction | 2026 |
| UK Polar Network CIC | Professional & scientific | 2024 |
| UK Polo International Brand Co., Ltd | Manufacturing | 2025 |
| UK Project Management Solutions Limited | Administrative & support | 2013 |
| UK Pulses Ltd | Agriculture & fishing | 2016 |
| UK Pyramid Specialty Fertilizer Co., Ltd | Mining & quarrying | 2025 |
| UK Qiaozhijia International Limited | Manufacturing | 2024 |
| UK Qnai International Limited | Extraterritorial | 2021 |
| UK Rephonate Hearing Group Co., Ltd | Manufacturing | 2020 |
| UK Road and Rail Ltd | Construction | 2018 |
| UK Rock Bearing Co., Ltd | Manufacturing | 2024 |
| UK Rsbc Network Technology Co. Ltd | Manufacturing | 2023 |
| UK RUI Crown Hot Spring Resort Hotel Management Co., Ltd. | Hospitality | 2021 |
| UK Runqian Shuiyin Tax Accountant Office Co., Ltd | Professional & scientific | 2023 |
| UK Runsida Plant Protection Co., Ltd | Mining & quarrying | 2026 |
| UK Runxiaoman Group Biotechnology Co., Limited | Wholesale & retail | 2025 |
| UK Sacnam International Skin Care R & D Co., Ltd | Wholesale & retail | 2025 |
| UK Safer Internet Centre Ltd | Information & communication | 2016 |
| UK Saiyang Intl Chemical Fertilizers Limited | Extraterritorial | 2023 |
| UK Schmeiwe International Biotechnology Ltd | Mining & quarrying | 2024 |
| UK Schreder International Co., Ltd | Extraterritorial | 2025 |
| UK Sdtpower Industrial Co., Ltd | Extraterritorial | 2015 |
| UK Shikki Electric Co., Ltd. | Manufacturing | 2025 |
| UK Shile Chemical Mining Co., Limited | Extraterritorial | 2024 |
| UK Shiruiqi Biotechnology Co., Ltd | Agriculture & fishing | 2022 |
| UK Shopping Ltd | Wholesale & retail | 2012 |
| UK Silente Chemicals Limited | Wholesale & retail | 2023 |
| UK Sino-Swiss Unite Chemical Co., Ltd. | Extraterritorial | 2021 |
| UK Sinop Horticultural Nutrition Ltd | Manufacturing | 2025 |
| UK Snooker Petroleum & Chemical Industry Limited | Extraterritorial | 2006 |
| UK Soten (International) Crop Nutrition Co., Ltd | Extraterritorial | 2023 |
| UK Sstt COM Ltd | Information & communication | 2024 |
| UK Starlink . Ltd | Extraterritorial | 2022 |
| UK Starplex International Group., Ltd. | Wholesale & retail | 2023 |
| UK Stem Cell Regenerative Medical Genetic Engineering Co., Ltd. | Manufacturing | 2026 |
| UK Stermey Special Fertilizer Co., Ltd | Mining & quarrying | 2025 |
| UK SVC Bearing Co., Ltd. | Manufacturing | 2025 |
| UK Tedun Group Limited | Manufacturing | 2025 |
| UK Tertiary Education Admissions Service Limited | Education | 2023 |
| UK Tesol Academy | Information & communication | 2022 |
| UK Thames Crop Nutrition Co., Limited | Mining & quarrying | 2025 |
| UK the Ordinary Limited | Wholesale & retail | 2025 |
| UK Tillace International Crops Co., Ltd | Wholesale & retail | 2023 |
| UK Trom Brandon Co., Ltd | Manufacturing | 2025 |
| UK Trufeng Technology Ltd | Mining & quarrying | 2021 |
| UK Uborey Agricultural Technology Co., Ltd | Mining & quarrying | 2024 |
| UK Vape Inn Limited | Wholesale & retail | 2014 |
| UK Venath International Ltd | Wholesale & retail | 2025 |
| UK Visitor Guides Ltd | Extraterritorial | 2015 |
| UK Vplus Co., Ltd | Extraterritorial | 2019 |
| UK Ward Agricultural Group Co., Ltd | Mining & quarrying | 2026 |
| UK Widona Group Chemicals Limited | Wholesale & retail | 2024 |
| UK Xijie Crop Science Limited | Wholesale & retail | 2024 |
| UK Xingcan Group Co., Ltd | Wholesale & retail | 2026 |
| UK YA GUO Culture Media Ltd | Manufacturing | 2025 |
| UK Yelushi Plant Nutrition Co., Ltd. | Extraterritorial | 2023 |
| UK Youdamei Biology Technology Co., Limited | Wholesale & retail | 2025 |
| UK Youdid Crop Nutrition Ltd | Mining & quarrying | 2021 |
| UK Youshang Potash Deposit Group Limited | Extraterritorial | 2017 |
| UK Yuanyagn Biological Group Co., Ltd | Wholesale & retail | 2024 |
| UK Zhuoyue Crop Nutrition Co., Ltd | Wholesale & retail | 2025 |
| Uk-China Culture and Design Centre Ltd | Administrative & support | 2026 |
| Uk-China International Education Development Association | Education | 2023 |
| Uk-Sino Education Limited | Education | 2024 |
| Ukgator Ltd | Wholesale & retail | 2020 |
| Ulkom Limited | Information & communication | 2009 |
| Ultimate Floor Care UK Ltd | Administrative & support | 2015 |
| Ultimate Sports Therapy & Performance Limited | Health & social care | 2015 |
| Ultimate Wins Limited | Wholesale & retail | 2024 |
| Ultra Safe Nuclear Corporation UK Limited | Manufacturing | 2018 |
| Ultraclone Limited | Professional & scientific | 1986 |
| Ultrafog Limited | Manufacturing | 2011 |
| Ulysses IT Consulting Ltd | Information & communication | 2021 |
| Umar's Therapy Ltd | Other services | 2021 |
| Umbercroft Limited | Professional & scientific | 1990 |
| Umbrella Blue Ltd | Arts & recreation | 2024 |
| Umbrella DE Limited | Professional & scientific | 2012 |
| Umbrella Europe Limited | Real estate | 2005 |
| Umbrella Green Limited | Real estate | 2012 |
| Umbrella MF Limited | Professional & scientific | 2012 |
| Umccoy Limited | Manufacturing | 2024 |
| Unat Limited | Financial services | 2014 |
| Uncommon BIO Limited | Manufacturing | 2018 |
| Uncommon Nomineeco Limited | Financial services | 2026 |
| Uncultured Enterprises Ltd | Manufacturing | 2019 |