| JKM Services LDN Ltd | Information & communication | 2013 |
| Jkpa Limited | Construction | 2026 |
| Jkumar Enterprise UK Limited | Manufacturing | 2025 |
| JKV Residentials Ltd | Real estate | 2023 |
| JKW Glazing Systems Ltd | Construction | 2024 |
| JL Capital Partners Ltd | Professional & scientific | 1986 |
| JL Copy Limited | Other services | 2011 |
| Jlhomes Enterprises Ltd | Health & social care | 2013 |
| Jlja Property Limited | Real estate | 2018 |
| Jlmo Ltd | Real estate | 2024 |
| JLR Estates Ltd | Real estate | 2018 |
| JLS Estates Ltd | Real estate | 2018 |
| JLS Personal Care Ltd | Wholesale & retail | 2016 |
| JM & AVC Live Limited | Administrative & support | 2018 |
| JM Business Management Services Limited | Administrative & support | 2019 |
| JM Convenience Store Limited | Wholesale & retail | 2013 |
| JM Glass and Glazing Ltd | Construction | 2018 |
| JM Knowle Store Limited | Wholesale & retail | 2025 |
| JM Labouring Ltd | Professional & scientific | 2024 |
| JM Management & Transformations Limited | Information & communication | 2024 |
| JM News Ltd | Wholesale & retail | 2011 |
| JM Partnership Ltd | Health & social care | 2024 |
| JM Physiocare Limited | Professional & scientific | 2012 |
| JM Visa Services Limited | Administrative & support | 2025 |
| Jm&E Electrical Ltd | Construction | 2019 |
| Jm&Sons Healthcare Ltd | Health & social care | 2019 |
| JMB Contracting Ltd | Construction | 2024 |
| JMB Design & Build Ltd | Construction | 2015 |
| JMB Design & Development Ltd | Construction | 2026 |
| JMC Realty Limited | Real estate | 2021 |
| JMD Distribution Ltd | Wholesale & retail | 2024 |
| JMD Manufacturing Ltd | Manufacturing | 2024 |
| JMD123 Limited | Real estate | 2022 |
| Jmgb Legal International Groups Ltd | Professional & scientific | 2017 |
| Jmii Limited | Real estate | 2025 |
| Jmist Developments Limited | Real estate | 2022 |
| JMJ PVT Ltd Limited | Construction | 2026 |
| JMK Group Holdings Limited | Professional & scientific | 2019 |
| JMM Building Limited | Construction | 2024 |
| JMP F (RHD) Limited | Construction | 2021 |
| JMP F Limited | Construction | 2021 |
| JMP Facilities (Developments - Eccles 1) Limited | Construction | 2020 |
| JMP Facilities (Developments) Limited | Construction | 2020 |
| JMP Facilities Limited | Construction | 2019 |
| JMP Management Limited | Real estate | 2011 |
| JMP Properties London Ltd | Real estate | 2024 |
| JMR Test Ltd | Administrative & support | 2020 |
| JMS Executive Protection Limited | Administrative & support | 2022 |
| JMS Maintenance Limited | Construction | 2010 |
| JMS Publicity Limited | Professional & scientific | 2024 |
| Jmsz Management Services Limited | Hospitality | 2016 |
| JMT Lettings Limited | Real estate | 2018 |
| JMW Barnard Management (Holdings) Limited | Administrative & support | 2022 |
| JMW Technical Limited | Professional & scientific | 2024 |
| JN Constructions Ltd | Construction | 2026 |
| JN Estates Limited | Financial services | 2021 |
| JN Group Limited | Financial services | 2015 |
| JN Property Management Services Limited | Other services | 2018 |
| JNF Consultancy Limited | Information & communication | 2020 |
| JNF IT Consultancy Ltd | Information & communication | 2025 |
| Jnhmotors Ltd | Wholesale & retail | 2019 |
| Jnhvisuals Ltd | Professional & scientific | 2025 |
| JNI Solutions Limited | Health & social care | 2019 |
| JNJ Estates Ltd | Real estate | 2020 |
| JNL Projects Limited | Professional & scientific | 2020 |
| Jnoad Limited | Construction | 1985 |
| Jnrr Ventures Ltd | Real estate | 2024 |
| JNV Distribution Limited | Administrative & support | 2016 |
| JO Construction Services Ltd | Construction | 2022 |
| JO Sedley Rawlence Limited | Professional & scientific | 2012 |
| Joanna Kyte Ltd | Professional & scientific | 2019 |
| JOB Done Garage Ltd | Wholesale & retail | 2023 |
| Joban Construction Ltd | Construction | 2025 |
| Jobency Services Limited | Construction | 2018 |
| Jobex Human Resources Consultancy Ltd | Administrative & support | 2025 |
| Jobicus Prime Ltd | Information & communication | 2024 |
| Jobsbank Limited | Administrative & support | 2015 |
| Jobsgopublic Limited | Administrative & support | 2011 |
| Jobspec Limited | Administrative & support | 2016 |
| Joca Limited | Arts & recreation | 2004 |
| Jodhpur Family Investment Company Ltd | Financial services | 2025 |
| Jodi Lotus Properties Ltd | Real estate | 2019 |
| Jodi Redhouse Photography Limited | Other services | 2012 |
| JOE Kelly Haulage Limited | Transport & logistics | 2005 |
| JOE Oshea Construction Ltd | Extraterritorial | 2014 |
| Joel Ross Property Ltd | Real estate | 2019 |
| Joella Productions Limited | Information & communication | 2000 |
| Joemc Services Limited | Construction | 2022 |
| Joesyl Courier Services Limited | Transport & logistics | 2021 |
| Joey Choy Limited | Professional & scientific | 2026 |
| Jogi Catering Ltd | Wholesale & retail | 2025 |
| Jogi Homes Investments Ltd | Real estate | 2012 |
| Johal Recycling Ltd | Extraterritorial | 2022 |
| Johal Skips Ltd | Water & waste | 2022 |
| Johal Waste Ltd | Water & waste | 2022 |
| Johalian Property Limited | Construction | 2002 |
| Johanas Construction Ltd | Construction | 2018 |
| John Cirmaci Builders Limited | Construction | 2003 |
| John Construction Ltd | Manufacturing | 2019 |
| John Cooper Build Ltd | Construction | 2022 |