| Joli Bar Limited | Hospitality | 2019 |
| Jolit Properties Ltd | Real estate | 2022 |
| Jollie Ceramics Limited | Manufacturing | 2025 |
| Jollies Play Cafe Limited | Arts & recreation | 2026 |
| Jollof Limited | Professional & scientific | 2004 |
| Jollof Yard Limited | Hospitality | 2026 |
| Jolly Unlimited Ltd | Wholesale & retail | 2024 |
| Joloda Conveyor Services Limited | Manufacturing | 2018 |
| Joloda Hydraroll Group Limited | Financial services | 2019 |
| Joloda Hydraroll Limited | Manufacturing | 1992 |
| Jolof Ltd | Wholesale & retail | 2025 |
| Jolt Strips Limited | Wholesale & retail | 2024 |
| Jomars Investments Ltd | Households | 2025 |
| Jomart Ltd | Wholesale & retail | 2025 |
| Jomo Holdings Limited | Real estate | 2020 |
| Jomo Property Management Ltd | Real estate | 2026 |
| Jomsom Food Ltd | Hospitality | 2023 |
| Jomsom Nepalese Ltd | Hospitality | 2025 |
| JON Ashton Ltd | Professional & scientific | 2015 |
| JON Bird Associates Limited | Professional & scientific | 2011 |
| JON Davies Accountants Limited | Professional & scientific | 2017 |
| JON Morrow Ltd | Professional & scientific | 2012 |
| Jonant Consultancy Limited | Professional & scientific | 2014 |
| Jonas Holdings Ltd | Real estate | 2019 |
| Jonathan Brennand Wealth Management Limited | Professional & scientific | 2024 |
| Jonathan Ford & Co Limited | Professional & scientific | 2003 |
| Jonathan Frost Rare Books Limited | Wholesale & retail | 2010 |
| Jonathon Plummer Consultancy Ltd | Professional & scientific | 2025 |
| Jones & DE VOS Properties Ltd | Real estate | 2026 |
| Jones & Sons Electrical Ltd | Construction | 2025 |
| Jones and Hart Properties Ltd | Real estate | 2024 |
| Jones and Reeds Ltd | Real estate | 2022 |
| Jones Commercial Group Limited | Administrative & support | 2023 |
| Jones E-Developments Ltd | Wholesale & retail | 2025 |
| Jones Group Investments Ltd | Real estate | 2024 |
| Jones Joinery (NW) Limited | Construction | 2021 |
| Jones Joinery Limited | Manufacturing | 1999 |
| Jones Legacy Construction Ltd | Construction | 2026 |
| Jones Legacy Group Limited | Real estate | 2025 |
| Jones Pharma Holdings Limited | Wholesale & retail | 2024 |
| Jones Rigby Holdings Limited | Real estate | 2018 |
| Jones,Hill & England Limited | Real estate | 1971 |
| Jonfex Limited | Professional & scientific | 2015 |
| Jonifer Enterprises PTY Ltd | Wholesale & retail | 2026 |
| Jonny Crane Limited | Arts & recreation | 2021 |
| Jonpauldevelopments Limited | Construction | 2021 |
| Jonpeace Ventures Ltd | Wholesale & retail | 2025 |
| Jonsec Entrance Systems Limited | Manufacturing | 2017 |
| Jonsson & Jonsson Ltd | Arts & recreation | 2019 |
| Jonsson Property Investments Ltd | Real estate | 2023 |
| Joolzery Limited | Manufacturing | 2017 |
| Joor Manchester West Gate Limited | Real estate | 2026 |
| Joor Manchester WHG Limited | Real estate | 2024 |
| Jopa Lets Ltd | Real estate | 2023 |
| Jopa Ltd | Real estate | 2024 |
| Jopa Property Ltd | Real estate | 2022 |
| Jope Group Limited | Construction | 2016 |
| Jophilray Limited | Hospitality | 2025 |
| Jordan Wall Ltd | Health & social care | 2025 |
| Jordan's Style Limited | Transport & logistics | 2022 |
| Jordans Ventures Limited | Professional & scientific | 2017 |
| Jorden Franklin Associates Ltd | Professional & scientific | 2014 |
| Jorel Care Ltd | Health & social care | 2025 |
| Jori Liverpool Ltd | Wholesale & retail | 2023 |
| Jorojo Ltd | Professional & scientific | 2024 |
| JOS Holdings Ltd | Financial services | 2022 |
| JOS UK Holdings Ltd | Financial services | 2025 |
| Joselsy Care Ltd Ltd | Health & social care | 2022 |
| Joseph & Henry's Homes Ltd | Real estate | 2024 |
| Joseph Group Holdings Ltd | Professional & scientific | 2023 |
| Joseph Lappin Partnership Limited | Other services | 2013 |
| Joseph Michael Daniels Ltd | Professional & scientific | 2016 |
| Joseph Mills (Denaturants) Limited | Wholesale & retail | 1975 |
| Joseph Parr (Alco) Limited | Wholesale & retail | 1937 |
| Joseph Parr (Middlesbrough) Limited | Wholesale & retail | 1970 |
| Joseph Parr (Northants) Limited | Wholesale & retail | 2020 |
| Joseph Parr (Tyne & Wear) Limited | Extraterritorial | 1991 |
| Joseph Parr Group Limited | Financial services | 1911 |
| Joseph Parr Limited | Wholesale & retail | 1980 |
| Joseph Rawlinson & Sons Limited | | 1925 |
| Joseph Relihan Property Ltd | Real estate | 2023 |
| Joseph Stuart Joinery Limited | Construction | 2019 |
| Joseph Williams Community Cafe CIC | Other services | 2016 |
| Josephat Kisimisi Ltd | Health & social care | 2013 |
| Josephkj Ltd | Health & social care | 2025 |
| Josh Homes Ltd | Real estate | 2018 |
| Joshar Associates Ltd | Professional & scientific | 2014 |
| Joshar Developments Ltd | Real estate | 2022 |
| Joshua Burke Limited | Real estate | 2018 |
| Joshua Investments Ltd | Administrative & support | 2020 |
| Joshua Sparkly Cleaning Ltd | Administrative & support | 2024 |
| Joshua Terry Ltd | Professional & scientific | 2018 |
| JOSHUA3 Ltd | Real estate | 2025 |
| Joshuas Jewellers Limited | Wholesale & retail | 2020 |
| Josie Harrey Ltd | Wholesale & retail | 2025 |
| Josros Garr (UK) Ltd | Real estate | 2024 |
| Jossetta Kitchens Limited | Construction | 2026 |
| JOT Paper Company Limited | Manufacturing | 2016 |
| JOT Solutions Ltd | Administrative & support | 2021 |
| Jota Enterprises Ltd | Hospitality | 2025 |