| J and G Chambers Consulting Ltd | Professional & scientific | 2011 |
| J C Briggs Ltd | Other services | 2016 |
| J D Aggregates (Midlands) Ltd | Transport & logistics | 2025 |
| J F Electrical Services (Midlands) Limited | Construction | 2004 |
| J K Cleaning Ltd | Administrative & support | 2025 |
| J Lawson Building Ltd | Administrative & support | 2025 |
| J M Services (Midlands) Ltd | Professional & scientific | 2019 |
| J P Aston Services Limited | Water & waste | 2004 |
| J P Deakin Plumbing & Heating Ltd | Construction | 2021 |
| J S Motorsport Limited | Manufacturing | 2006 |
| J Thirlby Equity Ltd | Real estate | 2025 |
| J Toranzo Ltd | Manufacturing | 2024 |
| J Wall Group Ltd | Wholesale & retail | 2024 |
| J. Nickson Consulting Ltd | Information & communication | 2025 |
| J.C. Ross Developments Ltd | Construction | 2021 |
| J.C.S.Tools Limited | Manufacturing | 1973 |
| J.Clarke Holdings Limited | Professional & scientific | 2008 |
| J.Clarke Transport(Lichfield)Limited | Administrative & support | 1961 |
| J.Cowley & Co Ltd | Construction | 2026 |
| J.I.M Electrical Ltd | Construction | 2021 |
| J.I.M Investments Limited | Real estate | 2023 |
| J.J. Textile Limited | Manufacturing | 2015 |
| J.K. Furnishing Limited | Construction | 2000 |
| J.K.B Building Services Limited | Construction | 2003 |
| J.Pelling Ltd | Information & communication | 2022 |
| J2E Ltd | Professional & scientific | 2009 |
| J3 Flooring Ltd | Construction | 2024 |
| J5E Ltd | Professional & scientific | 2021 |
| JAC Tools (Aylesbury) Limited | Wholesale & retail | 2013 |
| Jac's Electric Bikes Limited | Wholesale & retail | 2019 |
| Jack & Jill Pre-School Nursery Ltd | Education | 2013 |
| Jack Colclough Limited | Financial services | 2024 |
| Jack in the Box Day Nursery (Nuneaton) Limited | Health & social care | 2008 |
| Jaffa Enterprize Ltd | Wholesale & retail | 2025 |
| Jake Archer Limited | Professional & scientific | 2013 |
| Jakubas Holding Ltd | Financial services | 2025 |
| Jalali Restaurant Limited | Hospitality | 2019 |
| James Cookson Homes Ltd | Construction | 2021 |
| James Davies Carpentry Limited | Manufacturing | 2022 |
| James Davies Education Services Limited | Education | 2023 |
| James Trans Ltd | Transport & logistics | 2025 |
| James Wilson Limited | Extraterritorial | 2002 |
| JAN Afford Limited | Professional & scientific | 2009 |
| JAN Znak Ltd | Transport & logistics | 2019 |
| Jane Hands Ltd | Health & social care | 2025 |
| Jara Contracts Ltd | Construction | 2026 |
| Jasmine House Ltd | Hospitality | 2002 |
| Jasmine LEA Beauty Ltd | Other services | 2025 |
| Jasons Jackets Limited | Hospitality | 2007 |
| Jaspers Pet Services Limited | Other services | 2024 |
| JAW Global Trading Limited | Manufacturing | 2012 |
| JAY Lirbai MAA (M) Ltd | Wholesale & retail | 2020 |
| JAY Lirbai MAA Ltd | Wholesale & retail | 2018 |
| JAY Mitchinson Estate Agent Ltd | Real estate | 2023 |
| Jaybella Ltd | Wholesale & retail | 2025 |
| Jaycee (Coppice Side) Limited | Manufacturing | 2013 |
| Jayde Elise Events Ltd | Other services | 2024 |
| Jaymac Engineering Solutions Ltd | Construction | 2024 |
| JB 2 LET Limited | Real estate | 2016 |
| JB Burrows Property Limited | Real estate | 2025 |
| JB Financial Advice Ltd | Financial services | 2019 |
| JB Leadership Ltd | Other services | 2010 |
| JB Road Transport Limited | Transport & logistics | 2019 |
| Jbotics Ltd | Professional & scientific | 2025 |
| Jbwt Consultancy Limited | Professional & scientific | 2023 |
| JBX Group Ltd | Other services | 2026 |
| JC Development Holdings Limited | Financial services | 2026 |
| JC Home Renovations Limited | Construction | 2024 |
| JC Midlands Ltd | Water & waste | 2021 |
| JCG Accountancy Services Ltd | Professional & scientific | 2018 |
| Jcjp Limited | Professional & scientific | 2023 |
| JD Just Driveways Ltd | Construction | 2020 |
| JD Landscapes (Measham) Ltd | Construction | 2024 |
| JD Poussin Limited | Information & communication | 2026 |
| JD Resin Solutions Ltd | Manufacturing | 2026 |
| JDA Collective Ltd | Professional & scientific | 2023 |
| JDA Grounds Maintenance Services Ltd | Agriculture & fishing | 2022 |
| Jdawkins Properties Ltd | Real estate | 2026 |
| JDM Tools Ltd | Manufacturing | 2017 |
| Jdrm Capital Limited | Professional & scientific | 2025 |
| JDS Distribution & Logistics Ltd. | Transport & logistics | 2005 |
| Jelly Comms Ltd | Professional & scientific | 2022 |
| Jemco Rosario Limited | Health & social care | 2022 |
| Jensons Holdings Limited | Financial services | 2023 |
| Jen’S Events Ltd | Hospitality | 2025 |
| Jessica B9 Limited | Arts & recreation | 2026 |
| JET Installations Ltd | Construction | 2022 |
| JF Construction and Property Investment and Maintenance Services Limited | Construction | 2025 |
| JFH Civil Engineering Limited | Construction | 2017 |
| Jfpenrose Limited | Information & communication | 2023 |
| JG Capital Limited | Information & communication | 2021 |
| JGB Incorporated Limited | Financial services | 2023 |
| JGF Traffic Limited | Transport & logistics | 2017 |
| Jgsl Properties Ltd | Real estate | 2018 |
| JH Contracts Ltd | Construction | 2019 |
| JH Property (Midlands) Ltd | Construction | 2012 |
| JH Surface Repair Ltd | Construction | 2025 |
| JHB Comms Ltd | Information & communication | 2020 |
| Jimb Property Ltd | Real estate | 2021 |
| Jimh Limited | Professional & scientific | 2009 |