| Jennings Perks Limited | Professional & scientific | 2014 |
| Jensen Tech Ltd | Professional & scientific | 2013 |
| JEP Consultants Ltd | Professional & scientific | 2025 |
| JEP Site Solutions Ltd | Construction | 2013 |
| JER Transport Ltd | Transport & logistics | 2024 |
| Jeram Properties Ltd | Real estate | 2023 |
| Jerche Ltd | Health & social care | 2022 |
| Jessel Properties Limited | Real estate | 2023 |
| Jessica Samba Social Ltd | Information & communication | 2026 |
| Jesson Close Limited | Professional & scientific | 2004 |
| Jesy’S Services Limited | Administrative & support | 2023 |
| JET Clean Industrial Limited | Administrative & support | 2015 |
| JET IT Ltd | Manufacturing | 2021 |
| JET3 Travel Ltd | Administrative & support | 2025 |
| Jets Group Limited | Financial services | 2024 |
| Jewellery & Gifts Limited | Wholesale & retail | 2003 |
| Jewllylady Ltd | Wholesale & retail | 2025 |
| JF Boat Building Limited | Manufacturing | 2022 |
| JF Fashion Ltd | Wholesale & retail | 2025 |
| JG Engineering Consultants Ltd | Professional & scientific | 2020 |
| JGA Transport Limited | Transport & logistics | 2014 |
| Jgargas Haulage Limited | Transport & logistics | 2019 |
| JH Midland Builders Limited | Construction | 2024 |
| JH Unisex Barbers Limited | Other services | 2018 |
| JHA Online Ltd | Professional & scientific | 2015 |
| JHB L Hold Ltd | Real estate | 2025 |
| JHC Microsuction Ltd | Health & social care | 2024 |
| Jhoots Group Limited | Extraterritorial | 2015 |
| Jhoots Healthcare (Subco) Ltd | Wholesale & retail | 2024 |
| Jhoots Healthcare Limited | Wholesale & retail | 2009 |
| Jhutty Haulage Ltd | Transport & logistics | 2021 |
| Jigsaw Joinery Ltd | Manufacturing | 1995 |
| Jihan Ltd | Wholesale & retail | 2022 |
| JIL Solutions Limited | Health & social care | 2016 |
| Jimi Mini Market Ltd | Wholesale & retail | 2025 |
| JIN Medical Limited | Health & social care | 2022 |
| Jinder Catering Services Limited | Hospitality | 2006 |
| Jinder Catering Services WM Limited | Hospitality | 2021 |
| Jiptn Ltd | Wholesale & retail | 2026 |
| Jireh Swan Property Services Limited | Construction | 2025 |
| Jitterbyte Software Development Limited | Information & communication | 2016 |
| JJ (Metal Assemblies) Limited | Extraterritorial | 2010 |
| JJ Care Midlands Ltd | Hospitality | 2016 |
| JJ Houses Ltd | Real estate | 2025 |
| JJ Investments and Holdings Ltd | Real estate | 2023 |
| JJ OFF License & Groceries Limited | Wholesale & retail | 2024 |
| JJ Sparks Ltd | Construction | 2026 |
| JJ Truck Parts Ltd | Wholesale & retail | 2014 |
| JJ Wyatt Machinery Ltd | Administrative & support | 2023 |
| JJB Realtors Ltd | Real estate | 2018 |
| JJB Retail Limited | Wholesale & retail | 2020 |
| JJJ Brickwork Specialists Limited | Construction | 2025 |
| JJM Surfacing Ltd | Construction | 2018 |
| JJS Associates Ltd | Health & social care | 2022 |
| JK Export Limited | Wholesale & retail | 2022 |
| JK International Food & Drinks Ltd | Wholesale & retail | 2018 |
| Jk.Woodward Light Haulage Ltd | Transport & logistics | 2020 |
| JK28 Ltd | Hospitality | 2025 |
| JKB Consulting & Management Limited | Professional & scientific | 2015 |
| JKB1 Ltd | Wholesale & retail | 2023 |
| Jkgs Properties Limited | Real estate | 2019 |
| Jkjgproperties Limited | Real estate | 2025 |
| JKKP33 Ltd | Professional & scientific | 2024 |
| JKL Industrial Engineering Ltd | Manufacturing | 2014 |
| JKM Properties Midlands Ltd | Real estate | 2013 |
| JKM Real Estate Limited | Real estate | 2024 |
| JKO Success Logistics Ltd | Transport & logistics | 2011 |
| JKT Commercials Ltd | Wholesale & retail | 2024 |
| JL Birch Property Solutions Ltd | Construction | 2025 |
| JL Fitness Limited | Arts & recreation | 2022 |
| JL Management Consultancy Limited | Professional & scientific | 2025 |
| JLG Plant Hire Ltd | Administrative & support | 2019 |
| JLO Flooring Limited | Construction | 2015 |
| JLT Developments Ltd | Construction | 2015 |
| JLY Finance Ltd | Professional & scientific | 2025 |
| JM Investment Group Ltd | Education | 2019 |
| JM Midland Transport Ltd | Transport & logistics | 2022 |
| JM Mortgages Limited | Financial services | 2016 |
| JMA Composites Limited | Professional & scientific | 2016 |
| Jman Limited | Health & social care | 2016 |
| JMC Home Improvements (Staffs) Ltd | Construction | 2024 |
| JMF Live Limited | Professional & scientific | 2019 |
| Jmia Ltd | Education | 2022 |
| JMP IT Services Ltd | Information & communication | 2009 |
| JMT Care Ltd | Health & social care | 2023 |
| JMT Electrical Contractors Ltd | Construction | 2023 |
| JN Care Group Holdings Limited | Financial services | 2023 |
| JN Group Estates Limited | Financial services | 2023 |
| JN Healthcare Group Limited | Health & social care | 2019 |
| JN Healthcare Group Residential Ltd | Health & social care | 2023 |
| JN Property Group Limited | Real estate | 2021 |
| JN Rawal Ltd | Wholesale & retail | 2019 |
| JN Sports Investment Group Limited | Financial services | 2023 |
| JN3 Group Residential Limited | Health & social care | 2023 |
| JN3 Holdings Limited | Financial services | 2023 |
| JNC Property Holdings Ltd | Real estate | 2025 |
| JNK Haulage Ltd | Transport & logistics | 2021 |
| JNL Services Ltd | Manufacturing | 2018 |
| JNS Accountants Ltd | Professional & scientific | 2001 |
| JNS Bookkeeping & Payroll Bureau Ltd | Professional & scientific | 2017 |