| James Grace Logistics Limited | Transport & logistics | 2011 |
| James Hart (Chorley) Limited | Wholesale & retail | 1957 |
| James Pickervance Ltd | Administrative & support | 2021 |
| James V Investments Limited | Real estate | 2018 |
| Jameson Nell Ltd | Financial services | 2026 |
| Jamie Caine Ltd | Transport & logistics | 2017 |
| Jamie Sharp Racing Limited | Arts & recreation | 2016 |
| Jamie Works Limited | Other services | 2024 |
| Jamison Payroll Solutions Ltd | Administrative & support | 2020 |
| Jamjax Ltd | Information & communication | 2012 |
| Jammivu Limited | Professional & scientific | 2025 |
| Jamobe Ltd | Wholesale & retail | 2015 |
| JAN Harrison Limited | Health & social care | 1998 |
| Jane Worsley Care Consultants Ltd | Professional & scientific | 2022 |
| Janette Wallis Behaviour Solutions Limited | Health & social care | 2013 |
| Janine Vose Limited | Other services | 2013 |
| JAO Consulting Ltd | Information & communication | 2016 |
| Japy Healthcare Limited | Health & social care | 2016 |
| Jarion Limited | Administrative & support | 2016 |
| Jarpa Limited | Information & communication | 2015 |
| Jasa Properties Limited | Real estate | 1998 |
| JAW Property & Developments Ltd | Construction | 2026 |
| JAX Makama Domiciliary Care Limited | Health & social care | 2024 |
| Jaykishan Kirkham Limited | Wholesale & retail | 2025 |
| Jaykishan Limited | Wholesale & retail | 2010 |
| Jaykishan Lostock Hall Limited | Wholesale & retail | 2025 |
| Jaykishan Preston Limited | Wholesale & retail | 2020 |
| Jaykishan Southport Limited | Wholesale & retail | 2018 |
| Jaylawn Associates Limited | Professional & scientific | 1997 |
| JB Academy Ltd | Education | 2025 |
| JB Connect Holding Ltd | Financial services | 2025 |
| JB Fish Removal Ltd | Agriculture & fishing | 2016 |
| JB Inns and Taverns Ltd | Hospitality | 2018 |
| JBB Holdings Ltd | Financial services | 2026 |
| JBK Consultancy Limited | Construction | 2014 |
| Jcad Vintage Ltd | Wholesale & retail | 2024 |
| JCH Projects Limited | Construction | 2023 |
| JCM Homes Ltd | Construction | 2020 |
| JD Control & Automation Limited | Information & communication | 2012 |
| JD Northern Business Solutions Ltd | Professional & scientific | 2024 |
| JD Recovery and Transportation Ltd | Transport & logistics | 2025 |
| JDA Property Co Limited | Real estate | 1999 |
| JDF Joinery Services (NW) Ltd | Construction | 2010 |
| JDO Logistics Ltd | Transport & logistics | 2026 |
| JE Logistics Limited | Transport & logistics | 2008 |
| Jeal Services Ltd | Other services | 2018 |
| Jean Rigby Limited | Wholesale & retail | 1998 |
| Jedapc Limited | Professional & scientific | 2012 |
| Jeddha Ltd | Health & social care | 2019 |
| Jees Trans Limited | Transport & logistics | 2018 |
| Jeff’S Orange Rooms Limited | Administrative & support | 2002 |
| Jelly Days Ltd | Hospitality | 2017 |
| JEM Buildings Limited | Real estate | 2022 |
| JEM Contracting Ltd | Construction | 2025 |
| JEM Couture Clothing Ltd | Wholesale & retail | 2026 |
| JEM Living Kitchens Limited | Construction | 2005 |
| Jemstone 5D Ltd | Professional & scientific | 2019 |
| Jencro Holdings Limited | Financial services | 2025 |
| Jennifers Office Ltd | Financial services | 2012 |
| Jennings Gym AP Ltd | Education | 2024 |
| Jess Turner Limited | Manufacturing | 2019 |
| Jessica Jones Housekeeping Services Ltd | Administrative & support | 2023 |
| Jetting Hub Limited | Wholesale & retail | 2023 |
| Jewel Home Support (Lancs) Ltd | Health & social care | 2020 |
| Jewels MAY Limited | Wholesale & retail | 2013 |
| JG Logistics Ltd | Transport & logistics | 2023 |
| JG Surveying Services Limited | Professional & scientific | 2016 |
| JGS Hospitality Limited | Wholesale & retail | 2021 |
| JH Bibby Consulting Limited | Professional & scientific | 2019 |
| JH DA Trading Ltd | Wholesale & retail | 2026 |
| JH Independent Safeguarding Ltd | Administrative & support | 2024 |
| JH Rigging Limited | Construction | 2024 |
| JHJ Global Limited | Administrative & support | 2023 |
| Jidhin Sani Limited | Professional & scientific | 2015 |
| Jim's Cabs Limited | Transport & logistics | 2013 |
| Jimjam the Label Limited | Wholesale & retail | 2021 |
| Jimp Ltd | Health & social care | 2016 |
| Jiselta Ltd | Wholesale & retail | 2025 |
| Jiselta Pet Food Ltd | Wholesale & retail | 2025 |
| Jixaw Building and Maintenance Ltd | Construction | 2018 |
| JJ Inns Limited | Hospitality | 2014 |
| JJ Welding Limited | Manufacturing | 2016 |
| JJI Holdings Ltd | Financial services | 2026 |
| JJJ Sisters Ltd | Hospitality | 2025 |
| JJM Construction Ltd | Construction | 2024 |
| JJM Motors Limited | Transport & logistics | 2017 |
| JK & AM Smith Developments Limited | Real estate | 2017 |
| JKA Property Management Limited | Real estate | 2018 |
| JKB Admin Limited | Health & social care | 2025 |
| JKH Property Ltd | Real estate | 2025 |
| JLC Haulage Limited | Transport & logistics | 2024 |
| JLD Electrical Contractors Ltd | Construction | 2023 |
| JLF Haulage Limited | Transport & logistics | 2018 |
| JLM Driver Training Ltd | Education | 2026 |
| JLR Service Centre Ltd | Wholesale & retail | 2025 |
| JM Assessments Limited | Administrative & support | 2018 |
| JM Construction NW Ltd | Construction | 2025 |
| JM Euxton Ltd | Hospitality | 2024 |
| JM Express Services Ltd | Transport & logistics | 2018 |
| JM Property Developers NW Ltd | Construction | 2025 |