| Izmir Barber Ltd | Other services | 2025 |
| Izosolo UK Limited | Manufacturing | 2017 |
| J & a Construction (Stoke) Limited | Construction | 2021 |
| J & a Travel Solution Ltd | Administrative & support | 2020 |
| J & B Transport Limited | Transport & logistics | 2016 |
| J & H Workz Ltd | Construction | 2025 |
| J & J Aesthetics Limited | Other services | 2023 |
| J & J Bourne Property Limited | Real estate | 2020 |
| J & L Cleaning Solutions Ltd | Administrative & support | 2025 |
| J & L Electrical Services Ltd | Construction | 2020 |
| J & L Gratton Ltd. | Construction | 1998 |
| J & M Properties (Cheshire) Limited | Real estate | 2025 |
| J & R Industrial Limited | Wholesale & retail | 2006 |
| J & S Leisure Limited | Real estate | 2000 |
| J & VEE Group (PTY) Ltd | Transport & logistics | 2023 |
| J and U Services Limited | Manufacturing | 2007 |
| J and V Fish Bar Limited | Hospitality | 2026 |
| J Baker Properties Limited | Real estate | 2020 |
| J C Electrical Contractors (UK) Limited | Construction | 2007 |
| J Carr Joinery Limited | Construction | 2017 |
| J D Bentley Limited | Construction | 2022 |
| J Development & Lets Limited | Real estate | 2022 |
| J E Academy Limited | Education | 2021 |
| J G Bailey Potatoes Limited | Wholesale & retail | 2018 |
| J G Car Sales Limited | Wholesale & retail | 2025 |
| J Gallimore Limited | Construction | 2002 |
| J H Properties ( Staffordshire) Limited | Real estate | 2012 |
| J Haddon Plastering Ltd | Construction | 2026 |
| J Harry Properties Limited | Real estate | 2021 |
| J Harvey Services Ltd | Wholesale & retail | 2015 |
| J Hayes Haulage Limited | Transport & logistics | 2023 |
| J K Fabrications (SOT) Limited | Professional & scientific | 2012 |
| J Kashmir Construction Ltd | Construction | 2024 |
| J Keates Construction Services Ltd | Construction | 2017 |
| J Knall Holdings Ltd | Construction | 2020 |
| J L Harrison Homes Ltd | Real estate | 2023 |
| J L Moran Limited | Real estate | 2020 |
| J Latham Builders Ltd | Construction | 2012 |
| J Latham Developments Ltd | Construction | 2018 |
| J Moran Joinery & Building Services Ltd | Construction | 2026 |
| J Mountford Tree Services Ltd | Professional & scientific | 2022 |
| J P Sargeant Limited | Construction | 2026 |
| J R B Environmental Design Limited | Professional & scientific | 1999 |
| J Robinson Property Ltd | Real estate | 2025 |
| J S Machin Golf Limited | Wholesale & retail | 2023 |
| J S Sports (UK) Limited | Wholesale & retail | 2006 |
| J Turner and SON Builders Ltd | Construction | 2020 |
| J Whitfield & SON Decorative Aggregates Limited | Mining & quarrying | 2007 |
| J&B Entertainment Limited | Arts & recreation | 2011 |
| J&D Properties (Manchester) Limited | Real estate | 2001 |
| J&I END of Tenancy Cleaning Ltd | Administrative & support | 2021 |
| J&J Capable Care Ltd | Wholesale & retail | 2022 |
| J&J Management Ltd | Real estate | 2026 |
| J&K Construction and Landscaping Ltd | Construction | 2026 |
| J&N Hospitality Management Limited | Hospitality | 2024 |
| J&N Robertson Holdings Limited | Financial services | 2020 |
| J&S Group of Companies Limited | Health & social care | 2022 |
| J&S Property Stoke Ltd | Real estate | 2024 |
| J&Y Lonni Ltd | Hospitality | 2023 |
| J&Z’S Fastfood Ltd | Hospitality | 2025 |
| J-Home Goods Ltd | Wholesale & retail | 2025 |
| J. & A.J Pointon Limited | Real estate | 1949 |
| J. Copestake & Sons Limited | Transport & logistics | 2010 |
| J. Critchlow (Transport) Limited | Transport & logistics | 1965 |
| J. Hossack & Associates Limited | Real estate | 2014 |
| J. Littleton & Co. Limited | Construction | 1988 |
| J. LL. Leach (Holdings) & Co. Limited | Professional & scientific | 1994 |
| J. Two Limited | Construction | 2001 |
| J. Whitfield & SON Limited | Transport & logistics | 2004 |
| J.& A.Edwards Limited | Wholesale & retail | 1963 |
| J.A Operations Ltd | Construction | 2025 |
| J.A Urbannest Ltd | Real estate | 2025 |
| J.D. Commercials Limited | Other services | 2000 |
| J.D.'s OFF Licence Limited | Wholesale & retail | 2013 |
| J.E.C Bastable & SON Limited | Construction | 2011 |
| J.E.R. Global Limited | Wholesale & retail | 2025 |
| J.G Mason & SON Ltd | Transport & logistics | 2021 |
| J.H. Fenner & Co. (Advanced Engineered Products) Limited | Professional & scientific | 1956 |
| J.H.Fenner & Co.(India)Limited | Professional & scientific | 1942 |
| J.Halket Ltd | Wholesale & retail | 2026 |
| J.L.C. Training & Consultancy Ltd | Transport & logistics | 2019 |
| J.Lim Surgery Limited | Health & social care | 2007 |
| J.M. Milner Steel Framed Buildings Limited | Construction | 2011 |
| J.Massey Ltd | Transport & logistics | 2025 |
| J.R.F Interiors Ltd | Manufacturing | 2018 |
| J.R.W Commerce Ltd | Wholesale & retail | 2022 |
| J.Stubbs Consultancy Limited | Professional & scientific | 2019 |
| J.Till-Halket Ltd | Wholesale & retail | 2026 |
| J.W.J. Tideswell Limited | Agriculture & fishing | 2014 |
| J.Wheawall Joinery Ltd | Construction | 2019 |
| J7 Investments Ltd | Financial services | 2023 |
| J9 Property Ltd | Real estate | 2022 |
| JA Baty Limited | Wholesale & retail | 2025 |
| JA Capital Holdings Ltd | Administrative & support | 2025 |
| JA Corporation Limited | Wholesale & retail | 2025 |
| JAA Holdings Limited | Real estate | 2025 |
| Jaaf Limited | Education | 2026 |
| JAC Management Consultancy Ltd. | Professional & scientific | 2017 |
| Jack AG Services Limited | Agriculture & fishing | 2015 |
| Jack Dawson Funeral Services Ltd | Other services | 2022 |