| JNH Holdings Ltd | Financial services | 2024 |
| JO Oriental Food Ltd | Real estate | 2021 |
| Jobreels Technology Limited | Professional & scientific | 2026 |
| Joebyrneuk Ltd | Information & communication | 2022 |
| John Brown Land & Property Ltd | Professional & scientific | 2020 |
| John Challoner Associates Limited | Professional & scientific | 2016 |
| John Design Solutions Limited | Professional & scientific | 2017 |
| John Gough Limited | Agriculture & fishing | 1972 |
| John Harmer Ltd | Agriculture & fishing | 2002 |
| John Kinloch Construction Ltd | Construction | 2015 |
| John Lafferty Ltd | Professional & scientific | 2014 |
| John Nicholas Construction and Project Management Limited | Professional & scientific | 2020 |
| John Orrells Design Limited | Professional & scientific | 2020 |
| John PYE & Co Limited | Real estate | 2016 |
| John Sumner Limited | Wholesale & retail | 2002 |
| Johnny Wilkes Independent Consultant Limited | Information & communication | 2014 |
| Johnson & Johnson (Properties) Limited | Real estate | 2000 |
| Johnston Plus Ltd | Administrative & support | 2013 |
| Jolen Property Ltd | Real estate | 2022 |
| JON Sproson Limited | Professional & scientific | 2010 |
| Jonathan Wells Business Solutions Limited | Information & communication | 2011 |
| Joncon Limited | Information & communication | 2019 |
| Jones & Sons Developments Ltd | Construction | 2023 |
| Jones & Sons Holdings Limited | Financial services | 2025 |
| Jones Bros Interiors Limited | Construction | 2018 |
| Jones Property Management Limited | Real estate | 2023 |
| Jonina Ltd | Real estate | 2013 |
| Jonny Thaw Ltd | Information & communication | 2019 |
| Jonsons Limited | Construction | 2010 |
| Jordan Bland Electrical Ltd | Construction | 2018 |
| Joseki Limited | Information & communication | 2006 |
| Joseph Gibson Limited | Professional & scientific | 2011 |
| Josh Richardson Ltd | Arts & recreation | 2018 |
| Joshua Poston Ltd | Transport & logistics | 2026 |
| Joshua Transports Ltd | Transport & logistics | 2019 |
| Jospa International Enterprise Limited | Households | 2024 |
| Journey Into Africa Limited | Administrative & support | 2002 |
| JP Salon Ltd | Other services | 2016 |
| JPO Enterprise Limited | Professional & scientific | 2012 |
| JPO Investments Ltd | Financial services | 2018 |
| JPT Clark Ltd | Professional & scientific | 2023 |
| JR Property Contractors Limited | Construction | 2023 |
| JRA Construction Ltd | Construction | 2022 |
| Jrcallwood Ltd | Construction | 2019 |
| JRH Shropshire Limited | Real estate | 2021 |
| JRN Construction Management Ltd | Construction | 2021 |
| JS Construction (Shropshire) Limited | Construction | 2010 |
| JS Property Lettings Ltd | Real estate | 2024 |
| JS Rosewood Ltd | Agriculture & fishing | 2025 |
| JSF Training & Consultancy Ltd | Education | 2024 |
| JSM Sports Limited | Arts & recreation | 2026 |
| JT Page Holdings Ltd | Financial services | 2026 |
| JTC Plant Services Ltd | Construction | 2013 |
| Jtds Architecture Ltd | Professional & scientific | 2025 |
| Jtlw Property Limited | Hospitality | 2025 |
| Jubilee House (Worcester) Limited | Real estate | 2002 |
| Jubilee Park Residents Management Company Limited | Households | 2019 |
| Jubilee Villa Care Home Ltd | Health & social care | 2011 |
| Jubilee Walk Management Limited | Households | 2008 |
| Jules Warehouse Ltd | Wholesale & retail | 2024 |
| Julian (2000 Management) Limited | Households | 2000 |
| Julian J Harrison Limited | Professional & scientific | 2012 |
| Julian Spencer Associates Limited | Real estate | 2009 |
| Julie's SDS Limited | Health & social care | 2015 |
| Juliet Chilton Limited | Wholesale & retail | 1992 |
| Juniper Hill Fund Limited | Other services | 1958 |
| Just Beyoutiful Ltd | Other services | 2024 |
| Just Bikes 4 Kids Ltd | Wholesale & retail | 2017 |
| Just the JOB Jones Ltd. | Construction | 2019 |
| Justdata Limited | Information & communication | 2018 |
| Justin Jeffries Construction Ltd | Construction | 2018 |
| JW Legal Services Limited | Professional & scientific | 2013 |
| Jwwillis Limited | Health & social care | 2018 |
| JX Investments Ltd | Real estate | 2025 |
| JY3 UK Investments Ltd | Real estate | 2021 |
| Jyurky Ltd | Professional & scientific | 2024 |
| K & S Roofing (Shropshire) Limited | Construction | 2016 |
| K and K Nijjer Properties Ltd | Real estate | 2019 |
| K Bebb Social Care Limited | Health & social care | 2015 |
| K Capsules Ltd | Wholesale & retail | 2025 |
| K F Quinn Concrete Construction Ltd | Construction | 2004 |
| K H Restaurant & Takeaway Ltd | Hospitality | 2022 |
| K J Art Limited | Arts & recreation | 2022 |
| K J Electronics Systems Ltd | Administrative & support | 2011 |
| K Kelly Limited | Professional & scientific | 2012 |
| K L M Ground Maintenance Limited | Other services | 2023 |
| K R Hawkins Limited | Professional & scientific | 2015 |
| K R Mechanical Services Limited | Manufacturing | 2015 |
| K V Bishton Plumbing & Heating Engineers Limited | Construction | 2008 |
| K&S Equestrian Ltd | Wholesale & retail | 2025 |
| K.&M.Engineering(Shropshire)Limited | Construction | 1964 |
| K.G. Limited | Real estate | 1961 |
| K.K Transport Group Ltd | Transport & logistics | 2024 |
| K.R.F Groundworks Ltd | Administrative & support | 2019 |
| KA Landscaping and Groundworks Ltd | Administrative & support | 2025 |
| KA Sales Ltd | Wholesale & retail | 2026 |
| Kabir Pontesbury Fish Bar Limited | Hospitality | 2025 |
| Kaeds Ltd | Information & communication | 2026 |
| Kaizen Consultants (UK) Ltd | Administrative & support | 2007 |
| Kaizen Consultants Europe Limited | Manufacturing | 2015 |