| Jmgluke Property Management Limited | Real estate | 2025 |
| JMH Building Services Ltd | Professional & scientific | 2023 |
| JMH Cleaning Ltd | Administrative & support | 2025 |
| JMH Occupational Health Limited | Health & social care | 2014 |
| JMH TM Limited | Construction | 2017 |
| Jmirza Housing Ltd | Real estate | 2026 |
| JML Network Ltd | Wholesale & retail | 2025 |
| JMN Environmental Ltd | Construction | 2017 |
| Jmnerio Limited | Health & social care | 2025 |
| JMO Electrics Ltd | Construction | 2021 |
| Jmordev Ltd | Information & communication | 2014 |
| JMP Properties Mids Ltd | Real estate | 2022 |
| Jmpr Digital Ltd | Information & communication | 2025 |
| JMR Wholesale Ltd | Wholesale & retail | 2014 |
| JMS Agencies Ltd | Professional & scientific | 2022 |
| JMS Electrical Solutions Ltd | Construction | 2022 |
| JMS Estate Agents Ltd | Real estate | 2013 |
| JMS Investments Ltd | Real estate | 2003 |
| JMS Midlands Ltd | Real estate | 2024 |
| JMS Online Limited | Wholesale & retail | 2023 |
| JMS Propco Limited | Real estate | 2025 |
| JMS Provider Limited | Education | 2024 |
| JMS Publishers Limited | Information & communication | 2024 |
| JMS Trading Ltd | Wholesale & retail | 2020 |
| Jmsparks Electrical Ltd | Construction | 2025 |
| JMT Building Services Ltd | Construction | 2018 |
| JMT Digital Marketing Limited | Professional & scientific | 2025 |
| Jmtr Properties Ltd | Construction | 2026 |
| JMW Traffic Services Ltd | Construction | 2024 |
| JMZ Holdings Limited | Financial services | 2026 |
| Jmzl Ltd | Wholesale & retail | 2026 |
| JN Collection Ltd | Wholesale & retail | 2023 |
| JN Health Pharmacon Ltd | Health & social care | 2015 |
| JN Modern Properties Inc Ltd | Real estate | 2023 |
| JN Project Management Ltd | Construction | 2017 |
| JN Pubs Limited | Hospitality | 2019 |
| JN Relaxation Centre Limited | Wholesale & retail | 2016 |
| Jnails.Uk Ltd | Other services | 2021 |
| Jncz-Drns Ltd | Professional & scientific | 2025 |
| JND Holdings Ltd | Financial services | 2022 |
| JNH Trading Ltd | Wholesale & retail | 2026 |
| JNJ Essentials Ltd | Wholesale & retail | 2021 |
| JNM Accountants Ltd | Professional & scientific | 2019 |
| JNN Global Ltd | Administrative & support | 2024 |
| JNP & Associates LLP | | 2012 |
| JNP Property Limited | Real estate | 2020 |
| JNR Concepts Limited | Health & social care | 2014 |
| JNR Flooring Services Limited | Construction | 2024 |
| JNR Ltd | Construction | 2015 |
| JNR Prestige Limited | Administrative & support | 2025 |
| JNR Skanks Ltd | Arts & recreation | 2022 |
| Jnsa Ltd | Professional & scientific | 2022 |
| Jnsf Pharma Limited | Wholesale & retail | 2022 |
| Jnsg Construction Limited | Construction | 2024 |
| Jnsr Associates Limited | Hospitality | 2024 |
| JNT Testing Ltd | Information & communication | 2024 |
| JO & JO Logistics Limited | Transport & logistics | 2025 |
| JO & PJ Holdings Ltd | Financial services | 2022 |
| JO Arufani Ltd | Health & social care | 2016 |
| JO IND Limited | Other services | 2011 |
| JO Investments Limited | Construction | 1956 |
| JO Jo's Pizza Ltd | Hospitality | 2025 |
| JO Jones Education Services Ltd | Education | 2019 |
| JO Jones Financial Services Limited | Financial services | 2016 |
| JO Kinsella Limited | Professional & scientific | 2025 |
| JO Milano Paris Inc Limited | Manufacturing | 2025 |
| JO Moolenschot Creative Limited | Professional & scientific | 2016 |
| JO Revaya Prestige Limited | Wholesale & retail | 2023 |
| JO Saunders Ltd | Real estate | 2024 |
| JO Ward Consultants Limited | Information & communication | 2001 |
| Jo's Burger Ltd | Hospitality | 2025 |
| Jo's Miracle Cleaning Ltd | Administrative & support | 2026 |
| Joan's Cleaning Limited | Other services | 2008 |
| Joanne's Florist Ltd | Administrative & support | 2017 |
| Joao and Elena Ltd | Health & social care | 2010 |
| JOB Provider Ltd | Administrative & support | 2019 |
| JOB Skills Ltd | Wholesale & retail | 2025 |
| JOB Vibe Ltd | Administrative & support | 2020 |
| JOBAN5911 Ltd | Wholesale & retail | 2025 |
| Jobapt Ltd | Administrative & support | 2024 |
| Jobility Talent Solutions Ltd | Administrative & support | 2023 |
| Joblogic Limited | Information & communication | 2013 |
| Joblu Khan Ltd | Health & social care | 2013 |
| Jobs UK Aberdeen Ltd | Agriculture & fishing | 2023 |
| Jobs UK Aberystwyth Ltd | Agriculture & fishing | 2023 |
| Jobs UK Administration and Accounting Ltd | Financial services | 2023 |
| Jobs UK Angus Ltd | Manufacturing | 2023 |
| Jobs UK Armagh Ltd | Mining & quarrying | 2023 |
| Jobs UK Ashford Ltd | Wholesale & retail | 2023 |
| Jobs UK Atherton Ltd | Information & communication | 2023 |
| Jobs UK Automotive Creative Industrial and Motoring Ltd | Manufacturing | 2023 |
| Jobs UK Aviation and Aerospace Ltd | Transport & logistics | 2023 |
| Jobs UK Aylesbury Ltd | Wholesale & retail | 2023 |
| Jobs UK AYR Ltd | Wholesale & retail | 2023 |
| Jobs UK Bangor Ltd | Agriculture & fishing | 2023 |
| Jobs UK Barnsley Ltd | Administrative & support | 2023 |
| Jobs UK Basildon Ltd | Hospitality | 2023 |
| Jobs UK Basingstoke Ltd | Hospitality | 2023 |
| Jobs UK Bath Ltd | Manufacturing | 2023 |
| Jobs UK Batley Ltd | Administrative & support | 2023 |