| J K Stores Leeds Limited | Wholesale & retail | 2025 |
| J K T Business Solutions Limited | Administrative & support | 2022 |
| J Kainth Consultancy Limited | Administrative & support | 2017 |
| J L Financial Solutions Limited | Financial services | 2012 |
| J LEE Software Ltd | Information & communication | 2026 |
| J M Borkowska Ltd | Health & social care | 2015 |
| J M Builders Leeds Limited | Construction | 2026 |
| J M Cardiology Limited | Health & social care | 2025 |
| J M Construction (Leeds) Limited | Construction | 1995 |
| J M Holmes Limited | Financial services | 2019 |
| J M Laurie Properties Limited | Professional & scientific | 2003 |
| J M Motor Centre Ltd | Wholesale & retail | 2016 |
| J M O'Connor Building Contractors Limited | Construction | 2002 |
| J M Tree Services Limited | Administrative & support | 2014 |
| J M W Support Services Ltd | Other services | 2022 |
| J Marston Engineers Ltd | Manufacturing | 2007 |
| J Mcgovern Limited | Other services | 2026 |
| J Mitchell Accountancy | Other services | 2024 |
| J Newton Building & Developments Limited | Construction | 2023 |
| J Normington Limited | Wholesale & retail | 2005 |
| J O Newns Ltd | Professional & scientific | 2011 |
| J P Logan Properties Ltd | Real estate | 2024 |
| J P Smith Painting & Decorating Limited | Construction | 2021 |
| J P Southern Refrigeration Limited | Extraterritorial | 2002 |
| J P Wild (Holdings) Limited | Financial services | 2017 |
| J P Wild Limited | Construction | 2005 |
| J Payne Properties Ltd | Real estate | 2025 |
| J Pinder Holdings Limited | Financial services | 2022 |
| J Quinlan JNR Holdings Ltd | Financial services | 2021 |
| J R Atkin Limited | Health & social care | 2005 |
| J R M Godden Associates Limited | Wholesale & retail | 1990 |
| J R Scientific Limited | Professional & scientific | 2012 |
| J R Woollam Ltd | Wholesale & retail | 2022 |
| J RAM Holdings Limited | Real estate | 2020 |
| J REZ Finance Ltd | Financial services | 2026 |
| J S Earthing Solutions Limited | Construction | 2004 |
| J S White & Co Limited | Professional & scientific | 2014 |
| J S Wholesale Limited | Administrative & support | 2014 |
| J Smart Home Builders Ltd | Construction | 2017 |
| J T Wowk Building & Maintenance Contractor Limited | Construction | 2007 |
| J TEC Labs Ltd | Information & communication | 2026 |
| J TEG Investment Limited | Information & communication | 2025 |
| J Todd Broadcast Services Ltd | Information & communication | 2020 |
| J Turner Design Ltd | Other services | 2016 |
| J V Home Maintenance Ltd | Other services | 2025 |
| J W Brownley Limited | Manufacturing | 2007 |
| J W Electrical (Yorkshire) Ltd | Construction | 2013 |
| J W Hart Consulting Ltd | Financial services | 2022 |
| J W Nowell Consulting Ltd | Construction | 2019 |
| J W Transport Services Limited | Transport & logistics | 2016 |
| J Wearing & Co | Administrative & support | 2011 |
| J Wheatley Electrical Ltd | Construction | 2023 |
| J Wilson Farms LLP | | 2018 |
| J Woods & Associates Limited | Health & social care | 2013 |
| J Zabrocki Ltd | Transport & logistics | 2016 |
| J&A Amini Properties Ltd | Real estate | 2023 |
| J&B Supermarket Limited | Wholesale & retail | 2024 |
| J&C Coaching Ltd | Education | 2025 |
| J&C Hospitality Limited | Hospitality | 2023 |
| J&D Dunwell Limited | Arts & recreation | 2017 |
| J&Dw Properties Ltd | Extraterritorial | 2021 |
| J&E Dwellings Ltd | Real estate | 2024 |
| J&E Outfitters Ltd | Wholesale & retail | 2021 |
| J&G Holdings Limited | Financial services | 2018 |
| J&Hyde Ltd | Transport & logistics | 2025 |
| J&I Transport Ltd | Transport & logistics | 2018 |
| J&J Properties Leeds Limited | Real estate | 2022 |
| J&J Property Mngt Ltd | Real estate | 2025 |
| J&Ks Cars Ltd | Transport & logistics | 2025 |
| J&Ks Motors Ltd | Administrative & support | 2019 |
| J&Ks Properties Ltd | Financial services | 2025 |
| J&M Landscapes (Yorkshire) Limited | Administrative & support | 2022 |
| J&M Traction Ltd | Transport & logistics | 2019 |
| J&Mk Holding Limited | Financial services | 2025 |
| J&R Allman Property Solutions Ltd | Real estate | 2026 |
| J&R Fourcourt Ltd | Wholesale & retail | 2022 |
| J&R Swift Couriers Ltd | Transport & logistics | 2025 |
| J&T Ventures Limited | Professional & scientific | 2017 |
| J&W Medical Services Limited | Health & social care | 2020 |
| J'Adore Decorations Ltd | Other services | 2018 |
| J'Amy Fearn Holdings Limited | Financial services | 2026 |
| J'S Property Investments (Leeds) Ltd | Real estate | 2023 |
| J-Contractor Limited | Information & communication | 2016 |
| J-Ply UK Limited | Wholesale & retail | 2020 |
| J. ALI Locum Ltd | Professional & scientific | 2012 |
| J. B. Trade Ltd. | Transport & logistics | 1997 |
| J. Browne Group Holdings Limited | Administrative & support | 2008 |
| J. Derry Limited | Financial services | 2013 |
| J. Dixon (Doncaster) Limited | Wholesale & retail | 1936 |
| J. E. Medical Limited | Administrative & support | 2022 |
| J. F. W Heating Ltd | Construction | 2018 |
| J. Forster Limited | Real estate | 1979 |
| J. Garcia Carrión UK Limited | Wholesale & retail | 2019 |
| J. H. Watson Property Management Limited | Real estate | 1985 |
| J. Hirst Electrical Engineers Limited | Manufacturing | 2008 |
| J. Iqbal Transport Ltd | Transport & logistics | 2025 |
| J. J. Harrison Estates Limited | Real estate | 1993 |
| J. Kellett Foods Limited | Wholesale & retail | 2004 |
| J. L. Brooks Limited | Wholesale & retail | 2010 |
| J. Long & Sons (Holdings) Limited | Financial services | 2021 |