| Jossglen Limited | Information & communication | 1973 |
| JOT Labs Limited | Information & communication | 2024 |
| Joules Resource Management Limited | Professional & scientific | 2015 |
| Joy & Grace Ltd | Real estate | 2024 |
| Joy Emms Bookkeeping Ltd | Professional & scientific | 2011 |
| Joy Jones Limited | Professional & scientific | 2017 |
| Joyce Property Services Ltd | Real estate | 2003 |
| JP & SON Property Services Ltd | Construction | 2025 |
| JP Bathrooms Ltd | Construction | 2021 |
| JP Broom Limited | Information & communication | 2017 |
| JP Close Protection Security Ltd | Administrative & support | 2024 |
| JP Kitchen Installations Ltd | Construction | 2021 |
| JP Motors Norwich Ltd | Wholesale & retail | 2025 |
| JP Pet Co Ltd | Wholesale & retail | 2023 |
| JP Wonder Ltd | Real estate | 2016 |
| JPA (Construction Management) Ltd | Construction | 2026 |
| JPB Invest Ltd | Information & communication | 2024 |
| JPB Scaffolding Services Ltd | Construction | 2011 |
| JPC Direct Limited | Wholesale & retail | 2013 |
| JPC Groundworks Ltd | Construction | 2018 |
| JPC Holdings Ltd | Financial services | 2025 |
| JPDC1 Ltd | Extraterritorial | 2022 |
| JPDC2 Ltd | Extraterritorial | 2022 |
| JPDC3 Ltd | Extraterritorial | 2022 |
| Jpec Group Electrical Limited | Construction | 2008 |
| Jpen Global Limited | Wholesale & retail | 2026 |
| Jpindustrial-Metal Roof and Clad Ltd | Construction | 2024 |
| JPJ IT Consultancy Ltd | Information & communication | 2019 |
| JPK Lettings Ltd | Real estate | 2024 |
| JPL Real Estate Ltd | Real estate | 2022 |
| Jppizza Limited | Hospitality | 2024 |
| JPR Norwich Limited | Hospitality | 2019 |
| JPR Technical Services Ltd | Professional & scientific | 2024 |
| JPS Developments (Norfolk) Limited | Real estate | 2017 |
| JPS Resources Limited | Information & communication | 2007 |
| Jpse Construction Limited | Construction | 2020 |
| Jpse Holdings Limited | Real estate | 2022 |
| Jpse Screwpiles Ltd | Construction | 2021 |
| Jpsk Motors Ltd | Wholesale & retail | 2020 |
| JR Ames Consultancy Ltd | Professional & scientific | 2024 |
| JR Autos Blickling Ltd | Wholesale & retail | 2025 |
| JR Downs Garden & Home Maintenance Ltd | Construction | 2021 |
| JR Group Developments Ltd | Construction | 2023 |
| JR One Holdings Ltd | Financial services | 2022 |
| JR Slaney Brickwork Ltd | Construction | 2016 |
| JR Solutions (Norwich) Ltd | Wholesale & retail | 2017 |
| Jrayling Consulting Engineers Limited | Professional & scientific | 2018 |
| JRC Project Services Ltd | Professional & scientific | 2018 |
| JRH Cleaning Services Ltd | Administrative & support | 2024 |
| JRH Endodontics Ltd | Health & social care | 2023 |
| Jrmt Investments Limited | Households | 2018 |
| JRP Media Ltd | Information & communication | 2024 |
| JRP Northwest Ltd | Construction | 2014 |
| JRR Management Ltd | Real estate | 2017 |
| JRS Store Ltd | Wholesale & retail | 2024 |
| JRW Financial Consultancy Ltd | Professional & scientific | 2022 |
| JRW Heating Solutions Ltd | Construction | 2025 |
| JS (Norwich) Limited | Real estate | 2018 |
| JS 38 Ltd | Professional & scientific | 2023 |
| JS Close Management Company Limited | Households | 2016 |
| JS CNC Repairs Limited | Manufacturing | 2021 |
| JS Computer and Device Help Ltd | Other services | 2025 |
| JS Construction EA Ltd | Construction | 2022 |
| JS Electrical (Norfolk) Ltd | Construction | 2026 |
| JS Hawkins Group Limited | Wholesale & retail | 2017 |
| JS Health & Fitness Ltd | Other services | 2015 |
| JS Properties (Norfolk) Limited | Real estate | 2019 |
| JS Services (East Anglia) Ltd | Administrative & support | 2023 |
| JS Web DEV Ltd. | Information & communication | 2018 |
| Js&P Consultants Limited | Wholesale & retail | 2009 |
| JSB Stories Ltd | Arts & recreation | 2025 |
| Jseg Limited | Hospitality | 2016 |
| JSF 4X4 Holdings Limited | Financial services | 2020 |
| JSF 4X4 Limited | Wholesale & retail | 2001 |
| JSF Electrical Services Ltd | Construction | 2022 |
| JSF Trading Limited | Construction | 2023 |
| Jsmr Trading Limited | Hospitality | 2014 |
| Jspeck Groundworks and Civils Ltd | Construction | 2021 |
| JSR Construction Limited | Construction | 2022 |
| JSR London Limited | Hospitality | 2015 |
| JSS Consulting Services Ltd | Professional & scientific | 2022 |
| JT Care Professionals Ltd | Health & social care | 2013 |
| JT Consultancy Norfolk Ltd | Professional & scientific | 2022 |
| JT Driver Hire Limited | Administrative & support | 2016 |
| JT Leasing Limited | Other services | 2019 |
| JTC Consultants (U.K.) Ltd | Financial services | 2024 |
| JTE422 Ltd | Other services | 2009 |
| Jtec Fabrications Ltd | Manufacturing | 2013 |
| Jtec Solutions Ltd | Manufacturing | 2022 |
| Jtek Electrical Ltd | Energy | 2015 |
| JTJ Landscaper Ltd | Administrative & support | 2025 |
| Jtlb Holdings Ltd | Real estate | 2022 |
| JTM Property Services Ltd | Real estate | 2018 |
| JTS Convenience Store Ltd | Wholesale & retail | 2024 |
| JTT Ltd | Wholesale & retail | 2022 |
| JTT Property Norfolk Ltd | Construction | 2023 |
| JTW Ltd | Financial services | 2023 |
| JU Dining Ltd | Hospitality | 2016 |
| Jubbed Enterprise Ltd | Professional & scientific | 2019 |
| Jubilee Court Dental Limited | Health & social care | 2021 |