| JK Events (NW) Ltd | Arts & recreation | 2023 |
| JK Trading Group Ltd | Wholesale & retail | 2020 |
| JK Travels and Tours Ltd | Administrative & support | 2022 |
| Jkitchen Cooks Limited | Hospitality | 2026 |
| Jkslimited Ltd | Wholesale & retail | 2026 |
| JL MCR Property Consultancy Ltd | Professional & scientific | 2020 |
| JL Royton Limited | Professional & scientific | 2018 |
| Jlct Properties Ltd | Real estate | 2021 |
| Jlees Systems Ltd | Information & communication | 2017 |
| JLG Industries (United Kingdom) Limited | Manufacturing | 1998 |
| JLR Jewellers Limited | Wholesale & retail | 2005 |
| JLR Property Services Ltd | Real estate | 2024 |
| JLS Properties Limited | Construction | 2001 |
| JLS Property Investment Ltd | Real estate | 2013 |
| JLS Saddleworth Limited | Real estate | 2022 |
| JLS Sandy Lane Limited | Real estate | 2021 |
| JLW Developments Limited | Real estate | 2017 |
| JM (Social Care Assessments) Limited | Health & social care | 2015 |
| JM Property Care Ltd | Construction | 2022 |
| JM Rackers Ltd | Construction | 2020 |
| JM Takeaway Ltd | Hospitality | 2025 |
| JMA Creative Solutions Ltd | Information & communication | 2023 |
| JMA Direct Ltd | Wholesale & retail | 2023 |
| JMB Trans Ltd | Transport & logistics | 2015 |
| JME Film Ltd | Information & communication | 2017 |
| Jmes Consultancy Limited | Professional & scientific | 2024 |
| JMH Driveways & Groundwork Ltd | Construction | 2026 |
| JMJ Unit Ltd. | Wholesale & retail | 2017 |
| JMK Marketing Ltd | Professional & scientific | 2024 |
| JML Payroll Services Ltd | Professional & scientific | 2019 |
| JML Property Group Ltd | Construction | 2021 |
| JMM Information Limited | Professional & scientific | 2009 |
| JMP Business Services Limited | Administrative & support | 2012 |
| JMR Decor Ltd | Construction | 2014 |
| Jmst Limited | Professional & scientific | 2010 |
| JNB Manufacturing Ltd | Manufacturing | 2024 |
| JNB Properties Limited | Real estate | 2018 |
| JNB Services Limited | Wholesale & retail | 2006 |
| JNC UK Freight Services Ltd | Transport & logistics | 2026 |
| JND Construction Ltd | Construction | 2025 |
| JND Property Ltd | Real estate | 2025 |
| JO Convenience Ltd | Wholesale & retail | 2026 |
| Jo's Place (NW) Limited | Hospitality | 2026 |
| Jobcrafters Ltd | Administrative & support | 2025 |
| Joby Holdings Ltd | Financial services | 2023 |
| Joel Children's Home Ltd | Health & social care | 2024 |
| Joel D Mcgarva Limited | Financial services | 2025 |
| Joel Mccleoud Consulting Ltd | Professional & scientific | 2024 |
| Joel’S Performance Academy Ltd | Health & social care | 2024 |
| JOG Cleaning Limited | Administrative & support | 2023 |
| Jogi Marketing Ltd | Wholesale & retail | 2025 |
| Jogs Properties Ltd | Real estate | 2022 |
| John Bradley & SON (Springs) Limited | Manufacturing | 1967 |
| John Dixon and Associates Limited | Professional & scientific | 1986 |
| John DIY Sales Ltd | Wholesale & retail | 2026 |
| John Dylan Property Ltd | Real estate | 2024 |
| John Hospitality Limited | Hospitality | 2023 |
| John Limes Ltd | Real estate | 2022 |
| John Penketh Limited | Construction | 1976 |
| John Taylor(Britannia)Limited | Real estate | 1926 |
| John's Clearances Ltd | Water & waste | 2022 |
| Johns' Properties Limited | Real estate | 1963 |
| Johnson Bros. (Oldham) Limited | Construction | 2004 |
| Johnson Homes (Northern) Limited | Construction | 2006 |
| Johnson Real Property Solutions Ltd | Real estate | 2025 |
| Join Barber Ltd | Information & communication | 2024 |
| Joint Approvals Unit for Periodic Training Limited | Professional & scientific | 2024 |
| Jointcaretherapy Ltd | Health & social care | 2025 |
| Jolly Giraffes Limited | Arts & recreation | 2017 |
| Jomec Engineering Services Ltd | Professional & scientific | 2023 |
| Jomec Properties Limited | Real estate | 2024 |
| JON Fearn Ltd | Professional & scientific | 2022 |
| JON Mackay Civil Engineering Limited | Construction | 2006 |
| Jonah Groundworks Ltd | Construction | 2025 |
| Jones & Charlton Consultant Specialists Limited | Administrative & support | 2023 |
| Jones and Co Holdings Ltd | Financial services | 2026 |
| Jones Floorworks Ltd | Construction | 2025 |
| Jones Letts Ltd | Real estate | 2026 |
| Jones Property Group (North West) Limited | Real estate | 2022 |
| Jonosheba Group Ltd | Education | 2022 |
| Jonosheba Properties Ltd | Real estate | 2025 |
| Jony,S Grill & Desserts Ltd | Wholesale & retail | 2017 |
| Joraonline Limited | Wholesale & retail | 2025 |
| Joseph Dutton Transport Limited | Transport & logistics | 2003 |
| Joseph Shaw Limited | Wholesale & retail | 2014 |
| Jostca Consultancy Limited | Administrative & support | 2026 |
| Joules Kitchen Limited | Hospitality | 2019 |
| Journeyhub Ltd | Administrative & support | 2025 |
| Joy Group Ltd | Financial services | 2023 |
| Joy Just One YOU Limited | Information & communication | 2023 |
| Joy Property Investment Ltd | Real estate | 2023 |
| Joy Property Portfolio Ltd | Real estate | 2023 |
| Joyful YOU Beauty and Wellbeing CIC | Hospitality | 2024 |
| JP Consultants NW Ltd | Financial services | 2016 |
| JP Promotions (Oldham) Limited | Hospitality | 2015 |
| JP Properties MCR Ltd | Real estate | 2026 |
| JP Shopping Ltd | Wholesale & retail | 2024 |
| JP Tippers Ltd | Transport & logistics | 2022 |
| Jpcreates Web Design Brighton Ltd | Information & communication | 2021 |
| JPD Car & Van Sales UK Ltd | Wholesale & retail | 2020 |