| Jlcdesign Ltd | Professional & scientific | 2018 |
| Jldja Ltd | Wholesale & retail | 2019 |
| JLF Holdings Ltd | Professional & scientific | 2021 |
| JLJ Food Ltd | Hospitality | 2025 |
| JLT Associates Ltd | Professional & scientific | 2018 |
| JM Property NW Ltd | Real estate | 2024 |
| JM Technical Design Consultancy Ltd | Professional & scientific | 2021 |
| Jm&C Limited | Hospitality | 2021 |
| Jmdevlin Ltd | Hospitality | 2019 |
| Jmeperformanceautos Ltd | Wholesale & retail | 2025 |
| JMK Holdings Ltd | Financial services | 2018 |
| Jmlv Limited | Information & communication | 2015 |
| Jmpg Ltd | Health & social care | 2019 |
| JMS Equipment Ltd | Wholesale & retail | 2016 |
| JMW Property Services NW Ltd | Other services | 2026 |
| JMW Services (NW) Ltd | Administrative & support | 2025 |
| JO Bennett Interiors Ltd | Professional & scientific | 2019 |
| JO Consultancy Services Ltd | Professional & scientific | 2026 |
| JO Jo's Fancy Dress Ltd | Wholesale & retail | 2019 |
| Jobstore Group Ltd | Administrative & support | 2025 |
| Jock Holdings Limited | Extraterritorial | 2026 |
| Jocky Holdings Limited | Extraterritorial | 2026 |
| Jodrell Construction Limited | Construction | 2018 |
| Jodson Digital Limited | Professional & scientific | 2021 |
| JOE Public Relations Limited | Professional & scientific | 2025 |
| JOE Thompson Foundation | Health & social care | 2026 |
| Joerg Dieter Becker | Other services | 2023 |
| John Appleby Ltd | Administrative & support | 2022 |
| John Caunt Scientific Limited | Manufacturing | 1989 |
| John Gillespie Underground Consulting Ltd | Construction | 2025 |
| John Hazel Property Limited | Real estate | 2009 |
| John K Project Management Ltd | Construction | 2025 |
| John L Lord & SON (Rizistal) Limited | Construction | 1963 |
| John Lord Holdings Limited | Professional & scientific | 1996 |
| John Peel Court Management Company Limited | Households | 2008 |
| Johnson Global Ltd | Health & social care | 2024 |
| Johnson's Building Services Limited | Construction | 2020 |
| Joja Health Care Limited | Administrative & support | 2023 |
| Jojo Artistry Ltd | Other services | 2021 |
| Jonathans Ltd | Construction | 2015 |
| Jones Electrical NW Ltd | Construction | 2025 |
| Jonsimon Greenmount Limited | Real estate | 2011 |
| Jools Property North West Limited | Real estate | 2020 |
| Joseph Destiny Ltd | Administrative & support | 2020 |
| Joshua Court Management Company Limited | Households | 2005 |
| Joshua Greaves & Sons Limited | Manufacturing | 1950 |
| Josteen Limited | Extraterritorial | 2020 |
| Joy Building Division Ltd | Administrative & support | 2019 |
| Joys Moment Limited | Wholesale & retail | 2021 |
| Joyton Ltd | Professional & scientific | 2026 |
| JP Ices Limited | Hospitality | 2013 |
| JPG Business Solutions Ltd | Professional & scientific | 2017 |
| JPM Projects Limited | Administrative & support | 2015 |
| JPO Group Limited | Financial services | 2016 |
| JRB Fitted Furniture Limited | Manufacturing | 2014 |
| Jrfabs Ltd | Manufacturing | 2014 |
| JS Distro Ltd | Wholesale & retail | 2024 |
| JS Levy Lancashire Limited | Wholesale & retail | 2015 |
| JS Levy Limited | Wholesale & retail | 2021 |
| JS Levy Manchester Limited | Wholesale & retail | 2023 |
| JS3 Global Ltd | Administrative & support | 2015 |
| JS3 Recruitment Ltd | Administrative & support | 2009 |
| JSD Estimating Services Ltd | Construction | 2020 |
| JSH Advisory Limited | Professional & scientific | 2025 |
| JSH Laser Limited | Manufacturing | 2005 |
| JSM MOT Centre Limited | Wholesale & retail | 2011 |
| JSM MOT Centre UK Limited | Wholesale & retail | 2017 |
| JSP Fire Protection Ltd | Construction | 2018 |
| JSS Property Consultancy Ltd | Real estate | 2025 |
| JT2 Ltd | Other services | 2012 |
| JTB Genesis Ltd | Health & social care | 2025 |
| JTK Property Ltd | Real estate | 2019 |
| JU Housing Limited | Real estate | 2021 |
| Juergen Mueller | Other services | 2024 |
| Juice Retailer Ltd | Wholesale & retail | 2020 |
| Julie Deluca Limited | Health & social care | 2016 |
| Jump Guards UK Ltd | Administrative & support | 2025 |
| Juniper Investors LLP | | 2012 |
| Jupiter Creative Ltd | Information & communication | 2025 |
| Jupiter Horizons Ltd | Information & communication | 2025 |
| Juris Causae Consulting Ltd | Information & communication | 2013 |
| Just Balance Accounting Ltd | Professional & scientific | 2023 |
| Just Good Stuff Group Ltd | Wholesale & retail | 2022 |
| Just SAY NET Limited | Information & communication | 2000 |
| Justin Axon Training & Consultancy Ltd | Professional & scientific | 2025 |
| JVI Limited | Wholesale & retail | 2025 |
| JVL Group Ltd | Administrative & support | 2026 |
| JVN Holdings Ltd | Real estate | 2020 |
| Jvpv-Tradewise Foundation | Other services | 2025 |
| JW Capital and Risk Management Limited | Financial services | 2024 |
| JW Software Limited | Information & communication | 2011 |
| JWK Wildlife Surveys Ltd | Professional & scientific | 2020 |
| K & a Murray (Adlington) Limited | Real estate | 2017 |
| K & S Aluminium Limited | Manufacturing | 2001 |
| K C Marketing & Design Limited | Administrative & support | 2008 |
| K Davine Consulting Ltd | Professional & scientific | 2019 |
| K J Plumbing Factors & Heating Spares Limited | Wholesale & retail | 1986 |
| K P Architecture Limited | Administrative & support | 2007 |
| K S Installations Limited | Construction | 2022 |
| K&M Motors Ltd | Wholesale & retail | 2023 |