| Jaram Associates Limited | Professional & scientific | 2014 |
| Jaram Holdings Limited | Real estate | 1998 |
| Jarek JJ Properties Ltd | Households | 2026 |
| Jariba International Recruitment Agency Ltd | Professional & scientific | 2021 |
| Jarvis Sound & Light Limited | Construction | 2015 |
| Jarvis Wind Services Ltd | Professional & scientific | 2026 |
| Jason Baron Limited | Construction | 2021 |
| Jason Building Services Ltd | Construction | 2020 |
| Jason Mehat Property Ltd | Real estate | 2022 |
| Jasons Minibus Service Ltd | Transport & logistics | 2026 |
| Jasun Stores Limited | Wholesale & retail | 2023 |
| JAT & Co UK Ltd | Professional & scientific | 2007 |
| Jathusan Limited | Wholesale & retail | 2025 |
| Jayjay Media Ltd | Information & communication | 2008 |
| Jaykay FC Ltd | Administrative & support | 2025 |
| Jazanah Contracting Limited | Information & communication | 2017 |
| JB Care Sollutions Limited | Health & social care | 2021 |
| JB Diamond Properties Limited | Real estate | 2019 |
| JB Driving Services Limited | Other services | 2018 |
| JB GAS Contractors Ltd | Manufacturing | 2010 |
| JB Sports and Dance Ltd | Other services | 2017 |
| JBE HR Consultancy Ltd | Professional & scientific | 2025 |
| JBK (Hull) Investments Ltd | Real estate | 2024 |
| JBK Property Investments Ltd | Real estate | 2024 |
| JC Contracting Services Ltd | Construction | 2015 |
| JC Fleet Services Ltd | Transport & logistics | 2025 |
| JC Investments Group Ltd | Real estate | 2024 |
| JC Site Services Ltd. | Information & communication | 2014 |
| JC Sopers Limited | Construction | 2022 |
| JC Transport Limited | Transport & logistics | 2024 |
| JC Turbine Services Limited | Professional & scientific | 2017 |
| JCE Agri Ltd | Manufacturing | 2024 |
| JCE Industries Ltd | Construction | 2024 |
| JCE Real Estate Ltd | Real estate | 2024 |
| JCE Renewable Services Limited | Construction | 2018 |
| Jcross Healthcare Services Limited | Health & social care | 2026 |
| Jcspecialist Ltd | Construction | 2023 |
| JCW Groundworks Ltd | Construction | 2024 |
| JD Barnfather Ltd. | Professional & scientific | 2016 |
| JD Bars Hull Ltd | Hospitality | 2023 |
| JD Joinery (Hull) Limited | Construction | 2021 |
| JD Service & MOT Centre Ltd | Wholesale & retail | 2019 |
| JDB Electrical Services Ltd | Construction | 2023 |
| Jdbm Limited | Construction | 2025 |
| JDE Legal Consultancy Limited | Transport & logistics | 2026 |
| JDK Electrical Limited | Construction | 2009 |
| JDL Engineering Management Limited | Construction | 2013 |
| JDR Automotive Limited | Information & communication | 2021 |
| JDS Property Lettings Limited | Real estate | 2017 |
| JDS Site Services Ltd | Manufacturing | 2025 |
| Jdselling Ltd | Extraterritorial | 2023 |
| JDT Operations Consultancy Ltd | Professional & scientific | 2025 |
| JED Meek Building & Maintenance Limited | Construction | 2024 |
| Jediq Ltd | Information & communication | 2007 |
| Jeezbliss Households Ltd | Administrative & support | 2026 |
| Jefim Properties Ltd | Real estate | 2024 |
| JEG Hospitality Ltd | Hospitality | 2025 |
| Jegz Construction Ltd | Construction | 2026 |
| Jellicoe and Beatty House Management Company Limited | Administrative & support | 1984 |
| Jemsel Childcare & Support Services Ltd | Administrative & support | 2025 |
| Jenalo Limited | Professional & scientific | 2019 |
| Jenkinson Holdings Limited | Financial services | 2019 |
| Jennie Mortimer Limited | Health & social care | 2018 |
| Jennifer M Ltd | Other services | 2023 |
| Jennysome Company Limited | Transport & logistics | 2024 |
| Jensen Estates Limited | Real estate | 2021 |
| Jensons Electrical Contractors Limited | Construction | 2022 |
| Jeremiasz Baum Music Ltd | Information & communication | 2023 |
| Jerry Transport Ltd | Transport & logistics | 2024 |
| Jesmah Group Limited | Wholesale & retail | 2026 |
| Jesmond Vegan Ltd | Hospitality | 2024 |
| Jesney Electrical Solutions Ltd | Other services | 2017 |
| Jesouth Limited | Hospitality | 2019 |
| Jesouth Property Ltd | Real estate | 2021 |
| Jess Charlton Creative Ltd | Professional & scientific | 2026 |
| Jessie Roux Media Limited | Information & communication | 2026 |
| Jessierouxhair Limited | Other services | 2025 |
| Jessy O Limited | Wholesale & retail | 2024 |
| JET Sutton Car Sales Ltd | Wholesale & retail | 2022 |
| Jezella Global UK Ltd | Transport & logistics | 2022 |
| Jfitness Ltd. | Arts & recreation | 2017 |
| JG Architects Ltd | Professional & scientific | 2021 |
| JG Ec&I Services Ltd | Professional & scientific | 2025 |
| JG Web Consultancy Ltd | Information & communication | 2017 |
| JGD Shutters Limited | Wholesale & retail | 2020 |
| JH Entertainments Ltd | Extraterritorial | 2020 |
| JH Online Coaching Ltd | Arts & recreation | 2024 |
| JH Shipping Ltd | Agriculture & fishing | 2024 |
| Jhatm Investments Limited | Financial services | 2025 |
| JHD Group Equities Limited | Construction | 2025 |
| JHD Group Holdings Limited | Administrative & support | 2025 |
| JHL Care Limited | Wholesale & retail | 2006 |
| JHS Dance Company Limited | Arts & recreation | 2025 |
| Jhsd Entertainments Ltd | Hospitality | 2019 |
| JIA Yuan Ltd | Hospitality | 2019 |
| JIB & Tonic Sailing Ltd | Transport & logistics | 2019 |
| Jiffy Logistics and Garage(Jlg) Ltd | Wholesale & retail | 2025 |
| Jifiji Ltd | Manufacturing | 2025 |
| Jikshu Traders Limited | Wholesale & retail | 2026 |
| JIM Day Building Services Limited | Construction | 2017 |