| Jasmin Allen Colour Specialist Ltd | Other services | 2022 |
| Jason Chemicals Solution Limited | Manufacturing | 2013 |
| Jasonwood (UK) Ltd | Extraterritorial | 2007 |
| Jaspan's Creations Limited | Wholesale & retail | 2025 |
| Jateni Design Limited | Professional & scientific | 2011 |
| Jaygo Limited | Administrative & support | 2017 |
| Jayho Industrial Co., Ltd | Manufacturing | 2024 |
| Jayled Lighting Ltd | Extraterritorial | 2016 |
| Jaynered Creative Design Limited | Arts & recreation | 2017 |
| Jaytai New Material Technology Co., Ltd | Manufacturing | 2025 |
| Jazkangaroo Leather Goods Co., Ltd | Extraterritorial | 2021 |
| JB Creative Limited | Information & communication | 2021 |
| JB Edge Limited | Extraterritorial | 2020 |
| JB Financial Services Limited | Extraterritorial | 2015 |
| JB Mode Co., Ltd. | Extraterritorial | 2014 |
| JB Railway Engineering Services Ltd | Professional & scientific | 2022 |
| JB SEO Limited | Professional & scientific | 2026 |
| JC Cruiser International Trade Co., Ltd | Extraterritorial | 2023 |
| JC Link Trading Co., Limited | Wholesale & retail | 2023 |
| JC Living Co., Ltd | Professional & scientific | 2015 |
| JC London Ltd | Real estate | 2021 |
| JC Machinery Technology Co., Ltd | Wholesale & retail | 2019 |
| JC Metallurgy SRL Ltd | Wholesale & retail | 2014 |
| JC Property Investment Solutions Limited | Real estate | 2023 |
| JC Tech MFG Co., Ltd | Manufacturing | 2024 |
| JCC & OCC Property Investments Limited | Real estate | 2015 |
| Jchen (UK) Limited | Extraterritorial | 2020 |
| JCK Industrial Co., Ltd | Wholesale & retail | 2014 |
| JCP Investments (London) LLP | | 2010 |
| JCR Projects Constructions Ltd | Construction | 2016 |
| Jcsi Management Ltd | Construction | 2010 |
| Jcsi Portfolio Limited | Real estate | 2020 |
| JD Allen Solar Ltd | Manufacturing | 2019 |
| JD Learning Limited | Professional & scientific | 2013 |
| Jd's A22 Detailing Ltd | Administrative & support | 2025 |
| Jd-Trading Co., Ltd | Extraterritorial | 2018 |
| JDW Building Maintenance Ltd | Construction | 2023 |
| Jeff Wollen Consulting Limited | Information & communication | 2019 |
| Jemse Limited | Real estate | 2022 |
| Jenkins Ryan Enterprises Ltd | Wholesale & retail | 2025 |
| Jennifer Holloway Consultancy Limited | Professional & scientific | 2004 |
| Jennifer's Lodge Limited | Health & social care | 2012 |
| Jennings Morton Friel Associates Limited | Administrative & support | 2002 |
| Jenny Fashion Co., Ltd | Extraterritorial | 2024 |
| Jermalachi Limited | Health & social care | 2016 |
| Jermay Trading Company Limited | Wholesale & retail | 2023 |
| Jess Spearing Properties and Doll Properties Ltd | Construction | 2020 |
| Jess Spearing Properties Limited | Real estate | 2016 |
| Jesus Arena Trust | Administrative & support | 2011 |
| Jesw Outdoor Ltd. | Wholesale & retail | 2025 |
| JET Flow UK (Northern) Ltd | Other services | 2023 |
| JET Flow UK (Southern) Limited | Water & waste | 2023 |
| JET Flow UK Services Ltd | Water & waste | 2017 |
| JET Maintenance Limited | Water & waste | 2006 |
| Jevir International Co., Limited | Wholesale & retail | 2024 |
| Jevric Ltd | Professional & scientific | 2008 |
| JF Heartstone Homes Ltd | Real estate | 2025 |
| JF Property Rental Limited | Real estate | 2021 |
| JFR Engineering Services Ltd | Information & communication | 2018 |
| JG International Co., Ltd | Extraterritorial | 2013 |
| JGA Holdings Limited | Financial services | 2023 |
| Jgraff Consulting Limited | Other services | 2021 |
| JHL Group Co., Ltd | Wholesale & retail | 2016 |
| Jhly Co., Ltd | Extraterritorial | 2021 |
| JHO Group Limited | Extraterritorial | 2013 |
| JHW Intelligent Electric Ltd | Energy | 2024 |
| JHW Private Offering Foundation | Financial services | 2023 |
| JHY Marine Service Co., Ltd. | Manufacturing | 2023 |
| JI FEI Holding Limited | Extraterritorial | 2014 |
| JIA HE Marine Service Co., Ltd | Extraterritorial | 2019 |
| JIA Sheng Trading Co., Ltd | Professional & scientific | 2023 |
| Jiaht Trading Co., Ltd. | Wholesale & retail | 2024 |
| Jiali Stage Special Effect Equipment Co., Ltd | Extraterritorial | 2019 |
| Jiameisi Trade Co., Ltd | Extraterritorial | 2016 |
| Jianda Pipes&Fittings Group Co., Ltd | Extraterritorial | 2021 |
| Jiang RU (SH) Trading Corporation Ltd | Extraterritorial | 2018 |
| Jiangmen Bencotek Motor Co., Ltd | Extraterritorial | 2015 |
| Jiangsu (Tisco) Yangming Special Steel Co., Ltd | Manufacturing | 2022 |
| Jiangsu Aifu Logistics Co., Ltd | Wholesale & retail | 2025 |
| Jiangsu Angel Medical Ltd | Extraterritorial | 2018 |
| Jiangsu Conversion Metal Tech Co., Ltd. | Manufacturing | 2024 |
| Jiangsu Dingo Ltd | Extraterritorial | 2019 |
| Jiangsu Donghao Rubber Co., Ltd. | Manufacturing | 2024 |
| Jiangsu Dongzhibao Automobile Co., Ltd | Extraterritorial | 2021 |
| Jiangsu Dowcrop Agro-Tech Co., Ltd | Extraterritorial | 2018 |
| Jiangsu Fenbo Telecom Technology Co., Ltd. | Wholesale & retail | 2023 |
| Jiangsu Glary Industrial Co., Ltd | Extraterritorial | 2020 |
| Jiangsu Gloden Time Industrial Co., Ltd | Extraterritorial | 2022 |
| Jiangsu HAO PAK Machinery Co., Ltd | Extraterritorial | 2022 |
| Jiangsu Huimin Automobile Accessories Manufacturing Co., Limited | Extraterritorial | 2019 |
| Jiangsu International Co., Ltd | Extraterritorial | 2014 |
| Jiangsu Jonova Agro Machinery Co., Ltd | Extraterritorial | 2016 |
| Jiangsu Keepmoving Vehicle Co., Ltd. | Extraterritorial | 2018 |
| Jiangsu Lanfeng Biochemical Co., Ltd | Extraterritorial | 2022 |
| Jiangsu Metal Technology Co., Ltd. | Manufacturing | 2023 |
| Jiangsu Sunflower Machinery Co., Limited | Manufacturing | 2022 |
| Jiangsu Sunyi Machinery Co., Ltd | Extraterritorial | 2022 |
| Jiangsu Taigang Metal Products Co., Limited | Manufacturing | 2023 |
| Jiangsu Taiyuan Steel Co., Limited | Manufacturing | 2023 |
| Jiangsu Younai Machinery Manufacturing Co., Ltd | Wholesale & retail | 2025 |