| JMB Tree Services Limited | Administrative & support | 2024 |
| JMC Contracting Ltd | Energy | 2024 |
| JMC Creative Ltd | Information & communication | 2022 |
| JMC Developments Limited | Extraterritorial | 2016 |
| JMC Estate Agents Limited | Real estate | 2009 |
| JMC Estates Agents (Sales) Limited | Real estate | 2010 |
| JMC Eyre Investment Ltd | Financial services | 2020 |
| JMC Nexus Ltd | Wholesale & retail | 2026 |
| Jmca Services Ltd | Information & communication | 2025 |
| Jmccormick Properties Limited | Households | 2025 |
| JMD Hospitality Limited | Hospitality | 2018 |
| JME a 2 Z Limited | Transport & logistics | 2019 |
| JME Compliance & Security Ltd | Administrative & support | 2026 |
| JME Site Engineering Limited | Construction | 2016 |
| JMG South Yorkshire Limited | Transport & logistics | 2022 |
| JMH Autos Limited | Wholesale & retail | 2025 |
| JMJ Pubs Ltd | Hospitality | 2025 |
| JML Building Services Ltd | Construction | 2013 |
| JML Holdings Ltd | Real estate | 2015 |
| JML Residential Property Developments Ltd | Construction | 2014 |
| JMM Anaesthesia Ltd | Health & social care | 2021 |
| JMR Joinery (Sheffield) Limited | Construction | 2012 |
| JMR Lighting Limited | Manufacturing | 2006 |
| JMR Motor Spares Ltd | Wholesale & retail | 2024 |
| JMT Haulage Ltd | Transport & logistics | 2014 |
| Jmuk Group Holdings Ltd | Wholesale & retail | 2024 |
| JMW Commercial Ltd | Information & communication | 2020 |
| JMY Property Management Ltd | Real estate | 2018 |
| JN Global Ventures Ltd | Wholesale & retail | 2026 |
| JN Rentals Ltd | Real estate | 2025 |
| JN Sports Ltd | Professional & scientific | 2021 |
| JNB Media Limited | Administrative & support | 2023 |
| JNC Engineering Ltd | Professional & scientific | 2025 |
| Jnctn Nineteen Ltd | Hospitality | 2025 |
| JNG Creative Ltd | Professional & scientific | 2016 |
| JNJ Bricklaying Limited | Construction | 2001 |
| Jnlnat&Co PVT Ltd | Wholesale & retail | 2022 |
| JNM Scaffolding Ltd | Construction | 2021 |
| JNN Locum Ltd | Health & social care | 2017 |
| JNT DIY & Trade Supplies Ltd | Wholesale & retail | 2022 |
| JO Meadows Nutrition Limited | Health & social care | 2019 |
| JO Media Ltd | Information & communication | 2021 |
| JO Overton RVN Ltd | Professional & scientific | 2017 |
| JO Preventative Dental Therapist Ltd | Health & social care | 2026 |
| JO Spencer Marketing Limited | Administrative & support | 2025 |
| Joan Hudson & Co Limited | Professional & scientific | 2011 |
| Joan Pettingill Consulting Limited | Professional & scientific | 2020 |
| Joanna Grace Ltd | Professional & scientific | 2016 |
| Joanna Island Ltd | Hospitality | 2025 |
| Joanna Louise Beauty Salon Limited | Other services | 2016 |
| Joanna Pinder Limited | Health & social care | 2003 |
| Joanna’S Bar Ltd | Hospitality | 2026 |
| JOB Wave Ltd | Administrative & support | 2023 |
| Joba Limited | Education | 2012 |
| Jobshare Works Ltd | Professional & scientific | 2024 |
| Jodaz Ltd | Construction | 2023 |
| Jodaz Media Ltd | Information & communication | 2024 |
| Jodie ANN Photography Ltd | Professional & scientific | 2022 |
| JOE C Trading Ltd | Wholesale & retail | 2025 |
| JOE Mattock Coaching Services Ltd | Education | 2024 |
| JOE Mcloughlin Consulting Ltd | Professional & scientific | 2025 |
| JOE P Beckett Limited | Real estate | 2025 |
| JOE Simpson Limited | Information & communication | 1998 |
| Joe's Ices Shop Ltd | Wholesale & retail | 2026 |
| Joeemmaproperty Limited | Real estate | 2025 |
| Joel Adams Mortgages Limited | Financial services | 2024 |
| Joel Aheran Property Development Ltd | Real estate | 2023 |
| Joel Cana Limited | Transport & logistics | 2020 |
| Joel Collins Limited | Administrative & support | 2010 |
| Joel Michael Publishing & Consultancy Limited | Wholesale & retail | 2022 |
| Jofus Medical Ltd | Health & social care | 2024 |
| Jogo Limited | Arts & recreation | 2008 |
| JOH Holdings Limited | Financial services | 2020 |
| Johal Bains Property Investments Limited | Real estate | 2018 |
| John Allen (Yorkshire) Limited | Construction | 2014 |
| John Anthony Organisation (Nottingham) Limited | Manufacturing | 1972 |
| John Arbon & LYN Valley Textiles Limited | Wholesale & retail | 2016 |
| John Barker & Dixon Limited | Manufacturing | 1961 |
| John Beatty Photography Limited | Professional & scientific | 2003 |
| John Bedford & Sons, Limited | Extraterritorial | 1997 |
| John Booth Legal Limited | Professional & scientific | 2022 |
| John Bower Limited | Wholesale & retail | 2005 |
| John Carr & Company (Electrical) Limited | Extraterritorial | 1955 |
| John Carr Electrical Ltd | Construction | 2026 |
| John Charles Carpets & Flooring Limited | Wholesale & retail | 1990 |
| John Crawshaw Holdings Limited | Financial services | 2023 |
| John D. Murray & Sons Limited | Professional & scientific | 1969 |
| John Goatley Ltd | Wholesale & retail | 2008 |
| John Harding Construction Limited | Real estate | 1966 |
| John Heath & Sons Limited | Other services | 2014 |
| John Holland Sales Limited | Wholesale & retail | 2013 |
| John House Ltd | Hospitality | 2024 |
| John Hughes (Roofing Merchant) Limited | Extraterritorial | 1987 |
| John Hughes (Wigan) Limited | Extraterritorial | 1985 |
| John Jones Music Ltd | Information & communication | 2016 |
| John Ledger Ltd | Information & communication | 1999 |
| John MAC Heating Ltd | Construction | 2023 |
| John Next Door Ltd | Arts & recreation | 2022 |
| John Norton & SON (Sheffield) Limited | Real estate | 1997 |
| John Norton Fabrications Limited | Manufacturing | 2009 |