| J Francis Roberts & SON Ltd | Other services | 2011 |
| J H Couriers Ltd | Transport & logistics | 2022 |
| J H Jones Woodcraft Fencing Limited | Construction | 2003 |
| J J Hughes Developments Limited | Construction | 2021 |
| J J Hughes Holdings Limited | Financial services | 2021 |
| J J Hughes Investments Limited | Financial services | 2021 |
| J J Hughes Rentals Limited | Real estate | 2021 |
| J Langford Limited | Construction | 2026 |
| J M (NW) Ltd | Hospitality | 2018 |
| J M Price & Associates Limited | Administrative & support | 2010 |
| J M Roberts Plumbing & Heating Ltd | Construction | 2016 |
| J Nicholls Ltd | Wholesale & retail | 2024 |
| J P Plastering Service Ltd | Construction | 2010 |
| J R K Evans Ltd | Wholesale & retail | 2026 |
| J R Turner Transport Ltd | Transport & logistics | 2020 |
| J S L Jones Limited | Agriculture & fishing | 2007 |
| J Tweedie Electrical Ltd | Construction | 2017 |
| J W Hinds Limited | Administrative & support | 2003 |
| J W Invest Limited | Construction | 2017 |
| J W Medical Ltd | Health & social care | 2020 |
| J Wilson Contractors Ltd | Agriculture & fishing | 2013 |
| J Wilson Homes Limited | Real estate | 2019 |
| J&D Haulage Ltd | Transport & logistics | 2021 |
| J&J Tasty Treats Limited | Wholesale & retail | 2017 |
| J&L Construction (Wrexham) Limited | Construction | 2025 |
| J. Jervis Accounting Services Limited | Professional & scientific | 2020 |
| J. Scott Furnishers (Marchwiel) Limited | Wholesale & retail | 1975 |
| J. Stephen P. Edwards Ltd | Professional & scientific | 2011 |
| J.A Brickwork Limited | Construction | 2021 |
| J.A.W. Jones Limited | Transport & logistics | 2007 |
| J.E. Construction Limited | Construction | 2015 |
| J.M. Kerruish (Builders) Limited | Construction | 1980 |
| J.O Property Ltd | Construction | 2023 |
| J.P Webber Transport Limited | Transport & logistics | 2021 |
| J.P.E. (NW) Limited | Construction | 2021 |
| J.R. Boyle (Wrexham) Limited | Wholesale & retail | 1981 |
| J.S.M. Associates Limited | Professional & scientific | 1990 |
| J2 Courier Solutions Ltd | Transport & logistics | 2025 |
| J7 Construction Ltd | Construction | 2017 |
| J7 Properties Ltd | Real estate | 2020 |
| JA Plumbing & Heating (NW) Limited | Construction | 2025 |
| Jack the Station Cat Limited | Wholesale & retail | 2002 |
| Jack Yard BBQ Ltd | Hospitality | 2024 |
| Jacob Co Holdings Limited | Financial services | 2025 |
| JAD Consulting (Cheshire) Ltd | Professional & scientific | 2016 |
| Jake Williams ICT Ltd | Information & communication | 2017 |
| Jamaica Ginn Ltd | Wholesale & retail | 2025 |
| Jamd Automotive Limited | Professional & scientific | 2008 |
| James Bowler Limited | Real estate | 2025 |
| James Felton Ltd | Professional & scientific | 2013 |
| James Hatton Fitted Furniture Ltd | Other services | 2023 |
| James Howell Property Limited | Real estate | 2024 |
| Jane Care Limited | Health & social care | 2018 |
| Jane Hancock Consulting Limited | Professional & scientific | 2003 |
| Janine Singleton Limited | Real estate | 2017 |
| Jarvis & Sons Renovations Ltd | Construction | 2025 |
| JAS Taxi Limited | Transport & logistics | 2025 |
| JAS Wong Limited | Hospitality | 2025 |
| Jasmine Vogue Properties Limited | Real estate | 2016 |
| JAY Joinery Ltd | Construction | 2021 |
| JAY Play Ltd | Health & social care | 2024 |
| Jazamor Ltd | Other services | 2023 |
| JBE Validation Limited | Professional & scientific | 2007 |
| JBF Group Holdings Limited | Professional & scientific | 2013 |
| JBF Group Ltd | Manufacturing | 1997 |
| Jbmc Physiotherapy Ltd | Health & social care | 2021 |
| Jbstone Ancillaries Ltd | Administrative & support | 2017 |
| Jbstone Ltd | Manufacturing | 2017 |
| JC Carpet Fitting Services Limited | Wholesale & retail | 2003 |
| JC Catering (Wrexham) Limited | Hospitality | 2025 |
| JCD Property Ltd | Real estate | 2018 |
| Jclj Properties Limited | Real estate | 2023 |
| JCS Transport Limited | Water & waste | 2018 |
| JD Auto Services (NW) Limited | Wholesale & retail | 2025 |
| JD Electrical (NW) Ltd | Construction | 2025 |
| JD Industrial Flooring Limited | Construction | 2019 |
| JD Investment Properties Ltd | Real estate | 2024 |
| JDB Enterprise Limited | Manufacturing | 2025 |
| Jdbr Ltd | Hospitality | 2024 |
| JDT Autos Ltd | Wholesale & retail | 2011 |
| Jedras Limited | Transport & logistics | 2017 |
| JEH Civil Engineering Limited | Wholesale & retail | 2007 |
| Jelly Totz Play Limited | Arts & recreation | 2009 |
| JEM Race Composites Ltd | Manufacturing | 2011 |
| Jenkins & Co 2004 Limited | Professional & scientific | 2004 |
| Jenkins PM Services Limited | Professional & scientific | 2024 |
| Jenkins Property SW Limited | Real estate | 2025 |
| JFH Window Cleaning Ltd | Administrative & support | 2016 |
| JFU Research Limited | Professional & scientific | 2015 |
| JG Site Services Limited | Construction | 2019 |
| JGA Solutions Ltd | Wholesale & retail | 2019 |
| JGN Hair Extensions Ltd | Other services | 2015 |
| JH Construction & Trading Ltd | Construction | 2019 |
| Jhrh Ltd | Administrative & support | 2019 |
| JIA HUA Ying FEI Limited | Hospitality | 2013 |
| Jigsaw Management UK Limited | Professional & scientific | 2018 |
| Jigsaw Wrexham Ltd | Education | 2020 |
| JIM Kynaston and SON (Agricultural and Garage Services) Limited | Wholesale & retail | 2023 |
| Jimed Holdings Ltd | Manufacturing | 2024 |
| Jimmy Greeves Engineering Ltd | Construction | 2018 |