| JMA Plastering and Rendering Ltd | Construction | 2024 |
| JMA Property & Land Ltd | Real estate | 2024 |
| Jmaria Locum Limited | Health & social care | 2015 |
| Jmasoninteriors Ltd | Construction | 2021 |
| JMB Manufacturing Ltd | Manufacturing | 2019 |
| JMC Groundwork's & Civils Limited | Construction | 2025 |
| Jmcs Property Ltd | Real estate | 2025 |
| JMF Deliveries Ltd | Transport & logistics | 2013 |
| JMG Windows Doors & Conservatories Ltd | Construction | 2025 |
| Jmgigtech Ltd | Wholesale & retail | 2026 |
| JMJ Cooperation Ltd | Wholesale & retail | 2021 |
| JML Reporting Limited | Health & social care | 2015 |
| JMS Renewables Ltd | Construction | 2026 |
| Jmss Ltd. | Construction | 2017 |
| JNR Investments Limited | Financial services | 2013 |
| JNT Developments Ltd | Real estate | 2024 |
| JO Painting Ltd | Construction | 2024 |
| Jo-Ann Kempster Counselling & Psychotherapy Ltd | Health & social care | 2024 |
| Joanna Madey-Khan Ltd | Wholesale & retail | 2020 |
| Joanna Rowbotham Ltd | Information & communication | 2013 |
| Joanne (JOE) Bingley Memorial Foundation | Professional & scientific | 2010 |
| JOE France Joinery Limited | Construction | 2016 |
| JOE Woodmass Joinery Limited | Construction | 2008 |
| Joe's Diner Foods Limited | Hospitality | 2026 |
| Joel Investment Group Ltd | Professional & scientific | 2024 |
| Joes Fast Food Limited | Hospitality | 2024 |
| Joes Fresh Meat Limited | Wholesale & retail | 2011 |
| John & Davis LLP | | 2024 |
| John Ashley Ltd | Wholesale & retail | 2017 |
| John Connelly Upvc Ltd | Construction | 2025 |
| John Fillingham Commercial Vehicles Limited | Wholesale & retail | 2001 |
| John Hughes Carpets & Floor Coverings Limited | Wholesale & retail | 2008 |
| John Johnson Electrical Limited | Construction | 2006 |
| John Maycock Plumbing & Heating Limited | Construction | 2017 |
| John Parr Music Limited | Arts & recreation | 1994 |
| John Paskell (Plumbing) Limited | Construction | 1992 |
| John S Bradwell Limited | Administrative & support | 2015 |
| John Washington Ltd | Transport & logistics | 2018 |
| Johns Jolly Holidays Limited | Administrative & support | 2024 |
| Johnson Fisher Services Ltd | Professional & scientific | 2020 |
| Johnstone Logistics Ltd | Transport & logistics | 2026 |
| Joinery and Fire Doors Limited | Construction | 2023 |
| Joinery by SJM Limited | Construction | 2021 |
| Jojsj Limited | Health & social care | 2020 |
| Jolian Ltd | Wholesale & retail | 2025 |
| Jolis Choice Ltd | Wholesale & retail | 2022 |
| Jomaro Installations Ltd | Construction | 2005 |
| JON Optical Ltd | Wholesale & retail | 2022 |
| JON Sawyer Consultancy Ltd | Professional & scientific | 2019 |
| Jonathan Wilson Boat Builders Limited | Manufacturing | 2020 |
| Jones DIY Limited | Wholesale & retail | 2021 |
| Jones Land Holdings Ltd | Agriculture & fishing | 2024 |
| Jones Pallets Ltd | Manufacturing | 2022 |
| Jones R Services Limited | Construction | 2026 |
| Jones Scents & Co Ltd | Construction | 2024 |
| Jonesabodes Ltd | Real estate | 2020 |
| Jons Express Transport Limited | Transport & logistics | 2007 |
| Jordanparkinson Limited | Administrative & support | 2019 |
| Joseph Watson Aviation Ltd | Administrative & support | 2021 |
| Josh Garrison Ltd | Professional & scientific | 2026 |
| Josh Limited | Real estate | 1994 |
| Joshkilby Photo&Video Ltd | Information & communication | 2021 |
| Joshtek Limited | Information & communication | 2012 |
| Joy Life Care Services Ltd | Administrative & support | 2022 |
| Joynes Entire Building Services Ltd | Construction | 2022 |
| Joys Estates Ltd | Real estate | 2025 |
| JP Fabrications (South Yorkshire) Limited | Other services | 2016 |
| JP Hospitality Group Ltd | Hospitality | 2026 |
| JP Independent Services Limited | Health & social care | 2019 |
| JP Northfield Limited | Administrative & support | 2010 |
| JP Photography Ltd | Wholesale & retail | 2014 |
| JP Trans Ltd | Transport & logistics | 2025 |
| JPL Signature Estates Ltd | Real estate | 2025 |
| JPS (Northern) Limited | Construction | 2013 |
| JPS Accountancy Services Ltd | Professional & scientific | 2015 |
| JPT Legal Ltd | Professional & scientific | 2026 |
| JPW Rail Training Ltd | Education | 2022 |
| Jpw-It Consulting Ltd | Information & communication | 2025 |
| JPX Global Solutions Ltd | Water & waste | 2023 |
| JR Energy Solutions Ltd | Construction | 2023 |
| JRE Plumbing & Heating Services Ltd | Construction | 2023 |
| JRF Radiology Reporting Limited | Health & social care | 2015 |
| JRG Fitness Limited | Arts & recreation | 2016 |
| JRK Entrepreneurs Ltd | Transport & logistics | 2023 |
| JRL Lettings Ltd | Real estate | 2023 |
| JRL Residential Limited | Real estate | 2024 |
| JRM Commercials Limited | Other services | 2015 |
| JRM Passive Fire Solutions Ltd | Construction | 2019 |
| JRM Truck Rental Ltd | Transport & logistics | 2026 |
| JRP Engineering Limited | Manufacturing | 2018 |
| JS Joinery Contractors Ltd | Construction | 2019 |
| JS NDT Connect Ltd | Professional & scientific | 2020 |
| JS Property Lettings & Developments Limited | Real estate | 2025 |
| JS Quantity Surveying Ltd | Professional & scientific | 2023 |
| JS Rigging Services Limited | Information & communication | 2023 |
| JS Wealth Management Limited | Financial services | 2025 |
| JSB Legal Consultancy Ltd | Professional & scientific | 2024 |
| JSF Group Ltd | Households | 2020 |
| JSF Joinery Manufacturers Ltd | Manufacturing | 2016 |
| JSH Mortgage Solutions Ltd | Financial services | 2023 |