| JSA Technologies Ltd | Information & communication | 2022 |
| Jsat Ltd | Wholesale & retail | 2018 |
| JSB Housing Ltd | Real estate | 2018 |
| Jscn Limited | Real estate | 2015 |
| JSD Campers Limited | Wholesale & retail | 2025 |
| Jsdm Properties Limited | Real estate | 2023 |
| JSF Construction (Yorkshire) Ltd | Hospitality | 2022 |
| JSG Financial Ltd | Real estate | 2025 |
| JSH Insights Ltd | Health & social care | 2024 |
| JSH Travels Limited | Transport & logistics | 2026 |
| Jskh Investments Limited | Financial services | 2022 |
| JSL Advisory UK Ltd | Information & communication | 2017 |
| JSL Digital Ltd | Professional & scientific | 2023 |
| JSL Medical Services Limited | Health & social care | 2019 |
| JSM Dent Ltd | Health & social care | 2026 |
| JSM Football Academy Ltd | Education | 2025 |
| JSM Housing Limited | Real estate | 2020 |
| Jsma Ltd | Wholesale & retail | 2023 |
| Jsmc Limited | Professional & scientific | 2002 |
| JSN Enterprises Limited | Health & social care | 2018 |
| Jspassa & Co Limited | Real estate | 2023 |
| Jsprayuk Ltd | Construction | 2019 |
| Jsquaredlogistics Ltd | Transport & logistics | 2016 |
| JSR Building Services Ltd | Construction | 2016 |
| JSR Energy Consultancy Limited | Professional & scientific | 2017 |
| JSR Estates Ltd | Real estate | 2018 |
| JSS Developments Leeds Limited | Professional & scientific | 2019 |
| Jssd Couriers Ltd | Transport & logistics | 2024 |
| Jssl Clothing Ltd | Wholesale & retail | 2022 |
| JSV Design & Create Studios Ltd | Hospitality | 2022 |
| JSV Expedition Ltd | Transport & logistics | 2021 |
| JT Fleetwash Ltd | Transport & logistics | 2025 |
| JT Group (UK) Limited | Financial services | 2006 |
| JT Holdings (UK) Limited | Financial services | 2014 |
| JT Investment Holdings Limited | Real estate | 2025 |
| JT Investment Solutions Ltd | Construction | 2019 |
| JT Pro Ltd | Professional & scientific | 2017 |
| JT Quality Services Ltd | Professional & scientific | 2021 |
| JT Rodgers Limited | Extraterritorial | 2019 |
| JT Rogers Limited | Wholesale & retail | 2018 |
| JT Wetrooms Limited | Extraterritorial | 2009 |
| Jt&Ct Investments Limited | Financial services | 2022 |
| Jtay Digital Ltd | Information & communication | 2025 |
| JTB Property Developments Limited | Real estate | 2023 |
| JTD Projects Limited | Construction | 2019 |
| JTF Carpentry Ltd. | Construction | 2022 |
| JTH Landscape Services Ltd | Administrative & support | 2023 |
| Jthrepairs Ltd | Other services | 2025 |
| JTJ Group Limited | Extraterritorial | 2015 |
| JTM Building Limited | Construction | 2020 |
| JTM Capital Ltd | Arts & recreation | 2025 |
| JTM Service Group Limited | Financial services | 2019 |
| JTM Service Limited | Manufacturing | 1990 |
| JTS Consultancy Limited | Professional & scientific | 2015 |
| Jubilee Accountancy LLP | | 2025 |
| Jubilee Estates Limited | Real estate | 1988 |
| Jubilee Housing Ltd | Real estate | 2011 |
| Jubilee Industrial Investments Limited | Real estate | 2002 |
| Jubilee Property Alfreton Limited | Real estate | 2023 |
| Jubilee Property Durham Limited | Real estate | 2022 |
| Jubilee Property Gore Road Limited | Real estate | 2022 |
| Jubilee Property Holdings Limited | Professional & scientific | 2015 |
| Jubilee Property International Holdings Limited | Professional & scientific | 2018 |
| Jubilee Property International Limited | Financial services | 2018 |
| Jubilee Property Newcastle Limited | Real estate | 2019 |
| Jubilee Property Strand Limited | Real estate | 2022 |
| Jubilee Property Thirsk Limited | Real estate | 2020 |
| Jubilee Property York Limited | Real estate | 2024 |
| Jublo Limited | Information & communication | 2017 |
| Jubloo Limited | Wholesale & retail | 2025 |
| Judex Gadget Centrals Ltd | Manufacturing | 2026 |
| Judex Gadget Ltd | Manufacturing | 2026 |
| Judge Services Limited | Real estate | 2004 |
| Judith a Scholefield & Associates Limited | Health & social care | 2005 |
| Judith's Kitchen Limited | Hospitality | 2020 |
| Judy M Ltd | Information & communication | 2023 |
| Jugganort Films Ltd | Administrative & support | 2026 |
| Juice Bayt Ltd | Hospitality | 2026 |
| Juice Media UK Limited | Professional & scientific | 2001 |
| Juici Wings Ltd | Hospitality | 2023 |
| Juicy African Kitchen Limited | Hospitality | 2020 |
| Juicy Chicken Ltd | Hospitality | 2018 |
| Jula Properties Limited | Real estate | 2018 |
| Julia Coakes Psychology Services Limited | Health & social care | 2013 |
| Julia Turner Properties Ltd | Real estate | 2018 |
| Julian Abbs Associates Limited | Information & communication | 2013 |
| Julian Daley Consulting Limited | Information & communication | 2025 |
| Julian Ridge Transport Planning Limited | Professional & scientific | 2010 |
| Julian Trading Ltd | Wholesale & retail | 2024 |
| Julian Webb Property Services Ltd | Administrative & support | 2005 |
| Julian’S Cleaning Ltd | Administrative & support | 2025 |
| Juliat Ltd | Information & communication | 2025 |
| Julie Beer Locums Ltd | Health & social care | 2022 |
| Julie Fitzmaurice (Harrogate) Limited | Wholesale & retail | 2011 |
| Julie Harrison Consulting Ltd | Professional & scientific | 2004 |
| Julie Jennings & Associates Limited | Professional & scientific | 2013 |
| Julie Parker Social Care Consultancy Limited | Health & social care | 2026 |
| Julie W Homes Limited | Real estate | 2017 |
| Juliepez Ltd | Health & social care | 2025 |
| July Defan Ltd | Construction | 2017 |