| JMC Enterprise (UK) Limited | Agriculture & fishing | 2006 |
| JMD Finance Limited | Financial services | 2023 |
| JMD Property Consultancy Limited | Professional & scientific | 2025 |
| Jmd-Gn Ltd | Health & social care | 2022 |
| JMG Fleet Compliance Ltd | Transport & logistics | 2024 |
| JMG Locum Ltd | Wholesale & retail | 2024 |
| JMG Real Estate Ltd | Real estate | 2022 |
| Jmgcapital Ltd | Wholesale & retail | 2025 |
| Jmgcommercial Ltd | Real estate | 2019 |
| Jmgn Limited | Health & social care | 2021 |
| JMH Family Limited | Wholesale & retail | 2023 |
| Jmhector Ltd | Transport & logistics | 2020 |
| JMJ Bulk Packaging Limited | Administrative & support | 1994 |
| JMJ Transport Ltd | Transport & logistics | 2011 |
| JMK Events Ltd | Hospitality | 2025 |
| JMO Online Limited | Hospitality | 2015 |
| JMP Optics Limited | Health & social care | 2024 |
| Jmpdr Ltd | Wholesale & retail | 2018 |
| JMQ Consultancy Services Ltd | Professional & scientific | 2022 |
| JMR International Development Ltd | Wholesale & retail | 2002 |
| JMS Electrical Partnership Ltd | Construction | 2021 |
| JMS Enterprise Limited Company Limited | Wholesale & retail | 2013 |
| JMS Merchant Ltd | Wholesale & retail | 2025 |
| JMS Rail Consulting Ltd | Other services | 2015 |
| JMV Mental Health Care Ltd | Health & social care | 2022 |
| JMW Electrical & Automation Ltd | Construction | 2017 |
| JN Haulage Limited | Transport & logistics | 2023 |
| JNC Energy Limited | Energy | 2023 |
| JNC Property (Leics) Limited | Real estate | 2026 |
| JND Mortgages Limited | Other services | 2021 |
| JNJ London Limited | Wholesale & retail | 2024 |
| JNK Interiors Ltd | Households | 2019 |
| JNM Digital Marketing Ltd | Professional & scientific | 2017 |
| Jnmd Properties Ltd | Real estate | 2022 |
| JNP Enterprise Ltd | Households | 2014 |
| JNR Medicare Ltd | Health & social care | 2013 |
| JNV Food Ltd | Wholesale & retail | 2021 |
| JO & Co Midlands Limited | Hospitality | 2019 |
| JO Bloggs Limited | Information & communication | 2012 |
| JO DE Vries Therapy Publishing Ltd | Education | 2023 |
| JO Kehoe Training Limited | Professional & scientific | 2009 |
| Joanna Jablonska Ltd | Extraterritorial | 2024 |
| Joao Star Ltd | Other services | 2025 |
| Jobelforte Healthcare Limited | Health & social care | 2025 |
| JOBPATHS4U Limited | Administrative & support | 2017 |
| Jobson Sewing Machines Limited | Wholesale & retail | 2002 |
| Jobstars UK Limited | Administrative & support | 2022 |
| Jodin Data Consults Ltd | Information & communication | 2020 |
| Jodwell Trusted Ltd | Transport & logistics | 2015 |
| JOE & Co Group Ltd | Hospitality | 2025 |
| JOE Harris Carpentry & Construction Ltd | Construction | 2022 |
| JOE Hawkins 1977 Limited | Health & social care | 2016 |
| JOE Heyes Enterprises Limited | Professional & scientific | 2020 |
| JOE Projects Limited | Construction | 2025 |
| JOE R M Watts Limited | Professional & scientific | 2021 |
| JOE Shennan Ltd | Information & communication | 2026 |
| Joel Kirobi Ltd | Administrative & support | 2016 |
| Joel M. Brooks Ltd | Professional & scientific | 2018 |
| Joel Restoration Company Ltd | Real estate | 2023 |
| Joelj Ltd | Health & social care | 2022 |
| Joell Company Limited | Other services | 2020 |
| Joelsa Ltd | Wholesale & retail | 2015 |
| Joemel Ureta Ltd | Health & social care | 2022 |
| Joepad Building Services Ltd | Construction | 2021 |
| Joggler Inc Ltd | Information & communication | 2011 |
| Jogida Ltd | Transport & logistics | 2026 |
| Jogih Ltd | Information & communication | 2025 |
| Johair Limited | Other services | 2026 |
| Johal and Deol Ltd | Wholesale & retail | 2023 |
| Johal Consultancy Ltd | Transport & logistics | 2018 |
| Johal Investments (Leicester) Ltd | Hospitality | 2024 |
| Johal Properties (Leic) Ltd | Real estate | 2020 |
| Johal Taxis Ltd | Transport & logistics | 2023 |
| Johal Transport 2023 Limited | Transport & logistics | 2023 |
| Johals Properties (Oadby) Ltd | Real estate | 2020 |
| Johar and Company Solicitors Limited | Professional & scientific | 2017 |
| John Brindley (2010) Limited | Extraterritorial | 2010 |
| John Clulow (Frames) Limited | Wholesale & retail | 2002 |
| John Durrant Limited | Construction | 2006 |
| John F Consultancy Ltd | Professional & scientific | 2025 |
| John F Lobo Limited | Real estate | 2025 |
| John Fogg Limited | Transport & logistics | 2015 |
| John Harlow Limited | Professional & scientific | 2011 |
| John Hoyle Design Consultancy Ltd | Wholesale & retail | 2003 |
| John Kellys (Flavours) Limited | Administrative & support | 2017 |
| John Kellys (London) Limited | Administrative & support | 2014 |
| John Kellys (Trading) Ltd | Administrative & support | 2020 |
| John Littlejohn Designer Homes Limited | Construction | 2015 |
| John Mills Transport Services Limited | Extraterritorial | 2001 |
| John Morley Construction Ltd | Construction | 2012 |
| John O'Reilly Hairdressing Limited | Other services | 2011 |
| John Porter & Co Accountants Limited | Professional & scientific | 2015 |
| John Richardson Ltd | Extraterritorial | 2022 |
| John Rowan and Partners Employment Services Limited | Administrative & support | 2011 |
| John Simpkin Ltd | Professional & scientific | 2012 |
| John Whiteside Design Limited | Professional & scientific | 2018 |
| John Williams Roofing Limited | Construction | 2013 |
| John Williams Studios Limited | Professional & scientific | 1972 |
| John Williams Textile Machinery Sales Limited | Wholesale & retail | 1983 |
| Johndor Limited | Other services | 2017 |