| Johnjasper Resourcing Ltd | Administrative & support | 2021 |
| Johnny Genius Limited | Arts & recreation | 2007 |
| Johns & Johns Limited | Wholesale & retail | 2013 |
| Johnson CNC Services Limited | Professional & scientific | 2016 |
| Johnson Offshore Electrical Services Ltd | Construction | 2017 |
| Johnson Promotions Ltd | Arts & recreation | 2025 |
| Johnsons Fencing & Garden Services Ltd | Administrative & support | 2017 |
| Johnston Nicholas Construction Ltd | Construction | 2022 |
| Johto Limited | Professional & scientific | 2017 |
| Joicey Square Limited | Hospitality | 2026 |
| Joicey Street Management Company Limited | Households | 1992 |
| Join ME Ltd | Administrative & support | 2018 |
| Joinery North East Limited | Manufacturing | 2018 |
| Joines Consulting Ltd | Professional & scientific | 2018 |
| Joines Holdings Ltd | Financial services | 2022 |
| Joint Reconstruction North East Limited | Health & social care | 2019 |
| JOINTCARE7 Ltd | Health & social care | 2025 |
| Jokit Investments Ltd | Professional & scientific | 1999 |
| JOL Promotions Limited | Other services | 2013 |
| JOL Properties (NE) Limited | Real estate | 2018 |
| Jolido Ltd | Administrative & support | 2007 |
| Jolie VU Ltd | Hospitality | 2024 |
| Jollof Continental Store Ltd | Wholesale & retail | 2025 |
| Jollof Food Store Ltd | Wholesale & retail | 2020 |
| Jollof Fresh Food Store Ltd | Wholesale & retail | 2025 |
| Jollof Services Ltd. | Transport & logistics | 2017 |
| Jolly Creative Ltd | Professional & scientific | 2016 |
| Jolo Imports & Exports Ltd | Wholesale & retail | 2023 |
| Jomart Investments Ltd | Real estate | 2016 |
| JON Scott Parker Limited | Construction | 2013 |
| JON Toward Limited | Health & social care | 2002 |
| Jonathan Kemp Notary Public Ltd | Professional & scientific | 2015 |
| Jonathon Lewis Limited | Real estate | 2008 |
| Jonathon Stokes Limited | Professional & scientific | 2017 |
| Jondo Marketing Limited | Professional & scientific | 2024 |
| Jones Caravans Ltd | Manufacturing | 2021 |
| Jones Medical(Ne) Limited | Health & social care | 2023 |
| Jones Properties (NE) Ltd | Real estate | 2016 |
| Jones Wealth Holdings Limited | Financial services | 2026 |
| Jonny Bay Ltd | Extraterritorial | 2020 |
| Jonpye Bathrooms + Kitchens Ltd | Wholesale & retail | 2004 |
| Jonryn Limited | Professional & scientific | 2022 |
| Jophia Biagioni Limited | Real estate | 2022 |
| Jordan Varah Enterprises Ltd | Real estate | 2024 |
| Jordans Silver Services Ltd | Administrative & support | 2025 |
| Jordys Burgers Limited | Hospitality | 2023 |
| Josa Property Developments Ltd | Real estate | 2025 |
| Joseph & Josephs Limited | Health & social care | 2019 |
| Joseph Huntley & SON Limited | Wholesale & retail | 1927 |
| Joseph Mceleney Limited | Wholesale & retail | 1976 |
| Josephine's New Orleans Cuisine Ltd | Manufacturing | 2021 |
| Josh Cadman Furniture Design Ltd | Manufacturing | 2021 |
| Josh Tracey Ltd | Professional & scientific | 2025 |
| Joshrose.Co Limited | Arts & recreation | 2014 |
| Joshua M Kerr Ltd | Information & communication | 2019 |
| Jossyglamour World Ltd | Manufacturing | 2025 |
| Journey With Janey Ltd | Education | 2024 |
| Jourtani Health Care Group Ltd | Health & social care | 2025 |
| Jovia Living Limited | Real estate | 2026 |
| Jowan Properties Ltd | Households | 2025 |
| Joy of Sweets (Westerhope) Limited | Wholesale & retail | 2023 |
| Joy of Sweets Limited | Wholesale & retail | 2022 |
| Joybringers Ltd | Information & communication | 2024 |
| JP Energy (North East) Limited | Real estate | 2023 |
| JP Lawsons Ltd | Professional & scientific | 2023 |
| JP Property Development Homes Ltd | Real estate | 2025 |
| JP Synergy Ltd | Manufacturing | 2026 |
| JP Worsley Consultants Ltd | Other services | 2025 |
| JPE Access Solutions Ltd | Construction | 2019 |
| JPS Wind Ltd | Construction | 2025 |
| Jpsl Consulting Limited | Professional & scientific | 2009 |
| JPW Accountancy & Advisory Ltd | Professional & scientific | 2026 |
| JR Consultant Services Limited | Health & social care | 2011 |
| JR Corp Limited | Arts & recreation | 2022 |
| JR Online Ltd | Wholesale & retail | 2026 |
| Jrac Services Ltd | Professional & scientific | 2021 |
| JRB Surveyors Limited | Professional & scientific | 2013 |
| JRC Prior Limited | Hospitality | 2020 |
| JRG Project Management & Consultancy Ltd | Construction | 2022 |
| Jrose Groundwork’S Ltd | Administrative & support | 2021 |
| JRR Care Ltd | Health & social care | 2019 |
| JRW Estates Limited | Real estate | 2021 |
| JRW Property Management Ltd | Real estate | 2020 |
| JS Accountancy Ltd | Professional & scientific | 2019 |
| JS Construction Works Ltd | Construction | 2025 |
| JS Insulations Ltd | Construction | 2024 |
| JS Stores W Ltd | Wholesale & retail | 2023 |
| JS Wind Energy Ltd | Energy | 2019 |
| JS22 Limited | Hospitality | 2023 |
| JSB Management Services Ltd | Construction | 2020 |
| JSD & Sons NE Ltd | Construction | 2026 |
| JSD Creative Limited | Information & communication | 2022 |
| Jsgco Ltd | Extraterritorial | 2022 |
| JSN Developments Limited | Construction | 2006 |
| JSP Locums Ltd | Wholesale & retail | 2020 |
| JSR Vend Ltd | Hospitality | 2025 |
| JSW Renewables Ltd | Professional & scientific | 2025 |
| JT Brother Ltd | Wholesale & retail | 2020 |
| JT Energy Storage Ltd | Energy | 2021 |
| JT Fabrications Ltd | Manufacturing | 2026 |