| Jbdotco Ltd | Arts & recreation | 2023 |
| JC & JK Ventures Limited | Other services | 2014 |
| JC Fleet Solutions Ltd | Wholesale & retail | 2025 |
| JC Motors Engineering Limited | Wholesale & retail | 2016 |
| JC Vesta Limited | Real estate | 2023 |
| JCC Incorporated Ltd | Agriculture & fishing | 2024 |
| JCD Power Ltd | Construction | 2019 |
| Jcij Ltd | Information & communication | 2025 |
| JCM Integrated Solutions Ltd | Transport & logistics | 2009 |
| Jcmobiles Limited | Wholesale & retail | 2022 |
| JCS Machinery Ltd | Wholesale & retail | 2024 |
| JCS Property Holdings Limited | Real estate | 2023 |
| JCS Skips Ltd | Manufacturing | 2026 |
| JD Pro Sound Limited | Arts & recreation | 2017 |
| JDH Home Improvements Ltd | Construction | 2021 |
| JDR Joinery and Building Services Ltd | Construction | 2019 |
| JDR Trading Limited | Wholesale & retail | 2020 |
| JE Ancell Ltd | Financial services | 2026 |
| Jefmart Limited | Real estate | 2023 |
| Jemma Cowden Property Ltd | Real estate | 2026 |
| Jeremy Taylor & Co. Ltd | Professional & scientific | 2006 |
| JESMOND92 Limited | Professional & scientific | 2008 |
| Jewell Bike Training Ltd | Education | 2021 |
| Jewellery 4 U Limited | Wholesale & retail | 2026 |
| JFI Games Ltd | Information & communication | 2021 |
| JFI Holdings Ltd | Financial services | 2021 |
| JFL Accountancy Services Ltd | Extraterritorial | 2002 |
| JG & SON Properties Ltd | Real estate | 2024 |
| JG Group Holdings Ltd | Financial services | 2024 |
| JG Leisure Consulting Ltd | Professional & scientific | 2025 |
| JG Signalling Ltd | Construction | 2015 |
| JG Solutions Ltd | Transport & logistics | 2025 |
| JG Virtual Limited | Administrative & support | 2018 |
| Jinks Aston Limited | Real estate | 2019 |
| Jinmen Limited | Hospitality | 2024 |
| JJC Purchasing Ltd | Wholesale & retail | 2025 |
| Jjinvest Ltd | Professional & scientific | 2022 |
| JJR Medical Ltd | Health & social care | 2021 |
| Jjsweetz Ltd | Wholesale & retail | 2025 |
| Jj’S Mechanics&Co Ltd | Wholesale & retail | 2024 |
| JK Junction Limited | Agriculture & fishing | 2008 |
| JKM Cheshire Solutions Ltd | Real estate | 2025 |
| Jlow Consulting Ltd | Administrative & support | 2021 |
| Jlow Holdings Limited | Financial services | 2021 |
| Jlow Research Limited | Administrative & support | 2023 |
| JM Nicol Services Limited | Construction | 2026 |
| JMC Plant Services Limited | Professional & scientific | 2016 |
| JME SAE Ltd | Hospitality | 2024 |
| JMM Pharma (Allostock) Ltd | Professional & scientific | 2025 |
| JO Cotton Associates Limited | Administrative & support | 2016 |
| JO Jo's Day Nursery Ltd | Health & social care | 2018 |
| Jodrell Developments Limited | Real estate | 2021 |
| John Douglas Kerr Limited | Extraterritorial | 1984 |
| John H. Gardner Limited | Construction | 2006 |
| John J Wilkinson Auto Engineers Ltd | Wholesale & retail | 2025 |
| John Pass Limited | Wholesale & retail | 2010 |
| Johnson Investments Cheshire Limited | Financial services | 2024 |
| Johnson Tiles Holdings Limited | Financial services | 2024 |
| Johnson Tiles Limited | Wholesale & retail | 2024 |
| Johnson Tiles Property Limited | Extraterritorial | 2024 |
| Johnstone & Co Property Ltd | Construction | 2025 |
| Jojek Ltd | Wholesale & retail | 2021 |
| JOL Services Limited | Transport & logistics | 2019 |
| Jol's Restaurants Limited | Hospitality | 2015 |
| Jomale Property Ltd | Real estate | 2023 |
| JON Clarke Consultancy Ltd | Professional & scientific | 2024 |
| Jones & Harker Limited | Agriculture & fishing | 2025 |
| Jordan Racing Limited | Manufacturing | 2003 |
| Jordrt Ltd | Real estate | 2023 |
| Jorge Coporation Ltd | Wholesale & retail | 2025 |
| Joseph Burley Holdings Limited | Professional & scientific | 2010 |
| Joseph's Convenience Store Limited | Wholesale & retail | 2014 |
| Josmo Services Limited | Professional & scientific | 2018 |
| Journaling Matters CIC | Education | 2024 |
| JP Artistic Prints Ltd | Manufacturing | 2025 |
| JP Autoelit Car Ltd | Wholesale & retail | 2019 |
| Jpce Consultancy Limited | Health & social care | 2014 |
| JPR Designs Ltd | Extraterritorial | 2012 |
| JR Car & Commercial Ltd | Wholesale & retail | 2026 |
| JRC Architects Limited | Professional & scientific | 2016 |
| Jrmp Hospitality Ltd | Administrative & support | 2026 |
| JS and GJ Advisors Ltd | Professional & scientific | 2022 |
| JSA Engineering Limited | Construction | 2017 |
| Jsaka Ltd | Other services | 2025 |
| JSE Electrical Services Ltd | Construction | 2019 |
| JSG Sales and Marketing Ltd | Wholesale & retail | 2024 |
| JSK Trading Ltd | Wholesale & retail | 2023 |
| JT Express Ltd | Transport & logistics | 2016 |
| JT Landscape Design Ltd | Administrative & support | 2022 |
| JTG Financial Services Ltd | Financial services | 2026 |
| JTM Property Group Ltd | Construction | 2026 |
| Judo Property Investments Ltd | Real estate | 2025 |
| Julianne Ltd | Education | 2020 |
| Jumble Wood Properties Ltd | Construction | 2017 |
| Jumcent Properties Limited | Hospitality | 2025 |
| Junglejuicevapes Ltd | Wholesale & retail | 2019 |
| Jupiter Interior Fitting Limited | Construction | 2019 |
| Jurajda Transport Service Ltd | Transport & logistics | 2015 |
| Juristar Limited | Financial services | 2016 |
| Jussdrive Ltd | Wholesale & retail | 2025 |