| J&J Car Repairs Limited | Wholesale & retail | 2024 |
| J&K Convenience Store Limited | Wholesale & retail | 2023 |
| J&K Development Group Ltd | Real estate | 2026 |
| J&K Drywall Ltd | Construction | 2021 |
| J&K Enterprises Birmingham Limited | Wholesale & retail | 2026 |
| J&K Gardens Ltd | Administrative & support | 2026 |
| J&L Body Repairs Ltd | Wholesale & retail | 2020 |
| J&L Crowe Properties Ltd | Real estate | 2026 |
| J&L D Ltd | Real estate | 2023 |
| J&M Bridgen Ltd | Other services | 2020 |
| J&M Property Investors Ltd | Financial services | 2024 |
| J&M Recruitment Limited | Administrative & support | 2025 |
| J&N Autos Ltd | Wholesale & retail | 2012 |
| J&N Investments Limited | Real estate | 2016 |
| J&N Pride Autos Ltd | Wholesale & retail | 2023 |
| J&Q Investments Limited | Real estate | 2025 |
| J&R Essentials Ltd | Wholesale & retail | 2025 |
| J&R Property Limited | Real estate | 2018 |
| J&R Supplier Limited | Financial services | 2025 |
| J&S Coatings Ltd | Manufacturing | 2012 |
| J&S Elkin Ltd | Administrative & support | 2021 |
| J&S Partnership Ltd | Real estate | 2021 |
| J&S Property Partners Ltd | Real estate | 2020 |
| J&T Construction Ltd | Construction | 2025 |
| J&T Housing Ltd | Real estate | 2025 |
| J&T Plumbing & Heating Birmingham Ltd | Construction | 2019 |
| J&W Business Services Limited | Administrative & support | 2022 |
| J&W Investments Limited | Construction | 2023 |
| J'Adore Consultancy Ltd | Other services | 2024 |
| J'S Brothers Management Company Ltd | Hospitality | 2013 |
| J-Bex Limited | Arts & recreation | 2003 |
| J-M Storage Limited | Real estate | 2018 |
| J-Mech Pipework Services Limited | Construction | 2024 |
| J-Tech DG Consulting Ltd | Information & communication | 2018 |
| J. & A.M. Burke Developments Limited | Construction | 2003 |
| J. & G. Smart (Holdings) Limited | Manufacturing | 1988 |
| J. & M. Steels (Midlands) Limited | Manufacturing | 1983 |
| J. a. Detimil Limited | Construction | 1978 |
| J. Bailey Plumbing and Heating Services Limited | Construction | 2021 |
| J. Curwen Carpentry Ltd | Manufacturing | 2022 |
| J. E. Greenland Urology Ltd. | Health & social care | 2002 |
| J. Electrical UK Limited | Construction | 2001 |
| J. Hudson and Co. (Whistles) Limited | Manufacturing | 1949 |
| J. K. Advertising Limited | Manufacturing | 1983 |
| J. Lacey Industrial Services Limited | Construction | 1984 |
| J. Lacey Steeplejack Contractors Limited | Construction | 1979 |
| J. M. S Roofing & Building Limited | Construction | 2007 |
| J. S. Bhogal Ltd | Wholesale & retail | 2018 |
| J. Taylor Roofing & Building Ltd | Construction | 2018 |
| J. Tomlinson Limited | Construction | 1996 |
| J.& G.Smart(Engineers)Limited | Manufacturing | 1957 |
| J.4.J Limited | Construction | 2018 |
| J.A. Burke Construction Limited | Construction | 1994 |
| J.A. Conversions Limited | Construction | 2017 |
| J.A.A.Promotions Ltd | Wholesale & retail | 2021 |
| J.A.C.S Consulting Limited | Other services | 2019 |
| J.A.M Transport Ltd | Transport & logistics | 2025 |
| J.A.M. Concrete & Aggregates Ltd | Construction | 2024 |
| J.A.M.Holdings(Midlands) Ltd | Financial services | 2021 |
| J.A.S. Logistics Ltd | Transport & logistics | 2025 |
| J.Anania Limited | Transport & logistics | 2024 |
| J.B.Eccleston Limited | Professional & scientific | 2003 |
| J.Broadhurst Ltd | Real estate | 2011 |
| J.C Hires Limited | Administrative & support | 2025 |
| J.C. Components Limited | Manufacturing | 1997 |
| J.C.Groves Limited | Manufacturing | 1959 |
| J.C.J.L. Marketing Services Limited | Professional & scientific | 2006 |
| J.C.K. Properties Limited | Real estate | 2002 |
| J.D Communications Ltd | Information & communication | 2023 |
| J.D. Digital Installs Ltd | Construction | 2021 |
| J.D. Walsh Plastering Limited | Construction | 2016 |
| J.D.G Football Club Community Interest Company | Education | 2010 |
| J.E. Johnson Limited | Professional & scientific | 1990 |
| J.E. Marlow and Sons Limited | Wholesale & retail | 1965 |
| J.E.A.N Group Limited | Real estate | 2023 |
| J.E.S. Manufacturing Company Limited | Manufacturing | 1994 |
| J.E.Thom Build Limited | Construction | 2020 |
| J.F. Shears Limited | Real estate | 1958 |
| J.G.K. Transport Ltd | Transport & logistics | 2014 |
| J.H. Boardley Limited | | 1948 |
| J.H. Hancox Holdings Limited | Real estate | 1954 |
| J.Hipwell & SON Limited | Manufacturing | 1961 |
| J.Horner Holdings Ltd | Professional & scientific | 2020 |
| J.Hyde (MG) Ltd | Real estate | 2024 |
| J.J. Sigmagraphics Limited | Wholesale & retail | 1973 |
| J.J.D. Enterprises Limited | Real estate | 2012 |
| J.J.K. Developments Ltd. | Real estate | 2004 |
| J.J.Masters Ltd | Transport & logistics | 2026 |
| J.K.R.K Homes Ltd | Real estate | 2023 |
| J.L. Commercial Support Services Ltd | Professional & scientific | 2019 |
| J.M Renovators Ltd | Construction | 2017 |
| J.M. Baker (Heating & Plumbing) Limited | Construction | 2002 |
| J.M. Cooper Roofing Limited | Construction | 2024 |
| J.O. Global Solutions Limited | Information & communication | 2023 |
| J.O.S. Structures Limited | Construction | 2004 |
| J.P. Hyland Electrical Limited | Construction | 1997 |
| J.P. Trading Limited | Financial services | 2002 |
| J.P.F. Drylining Limited | Construction | 2013 |
| J.P.M. Parry & Associates Limited | Manufacturing | 1973 |
| J.P.Millwood Projects & Services Ltd | Information & communication | 2026 |