| JON Atkin Limited | Wholesale & retail | 2014 |
| JON Dean Properties Ltd | Real estate | 2026 |
| Jonathan Charles Designs UK Ltd | Wholesale & retail | 2017 |
| Jones 14 Properties Ltd | Real estate | 2024 |
| Jones Steel Limited | Wholesale & retail | 1994 |
| Jonils Sula Ltd | Professional & scientific | 2026 |
| Joocey Engineering Ltd | Professional & scientific | 2025 |
| Jools Patisserie Ltd | Manufacturing | 2023 |
| Jopling Consulting Ltd | Education | 2023 |
| Josela Properties Ltd | Real estate | 1998 |
| Joseph Alessander Ltd | Manufacturing | 2023 |
| Joseph Joinery Ltd | Manufacturing | 2022 |
| Joseph Leadership Academy Limited | Education | 2019 |
| Joseph Michael Consultancy Ltd | Information & communication | 2022 |
| Josh Bailey Hair Ltd | Other services | 2023 |
| Joshua Needs Design Limited | Professional & scientific | 2020 |
| Josy Bloggs Design Limited | Arts & recreation | 2002 |
| Joust Consulting Services UK Limited | Information & communication | 2018 |
| Jovia Properties Limited | Real estate | 2024 |
| Jovoco Limited | Real estate | 2009 |
| Jowett House Farms Limited | Real estate | 1981 |
| Joycebysam Ltd | Wholesale & retail | 2026 |
| Joynes & Hunt Limited | Administrative & support | 2018 |
| Joynson Jointing Limited | Construction | 2025 |
| JP and Associates Consultancy Limited | Education | 2022 |
| JP Construct Limited | Real estate | 2021 |
| JP Electrical Contractors Limited | Construction | 2017 |
| JP Prime Projects Limited | Real estate | 2023 |
| JP Rainey Construction Ltd | Construction | 2017 |
| JP Recruitment Solutions Limited | Administrative & support | 2020 |
| JP Utley Brickwork Contractor Ltd | Construction | 2020 |
| JPA Joinery Ltd | Construction | 2015 |
| JPB Jewellery Holdings Limited | Financial services | 2026 |
| JPB Jewellery Limited | Wholesale & retail | 2015 |
| JPC Ducting Ltd | Construction | 2017 |
| Jphs Sporting Ltd | Professional & scientific | 2022 |
| JPI Road Planing Ltd | Transport & logistics | 2012 |
| Jpsk Holdings Ltd | Arts & recreation | 2020 |
| JR Sangha Ltd | Transport & logistics | 2026 |
| JR Taylor Building Ltd | Construction | 2023 |
| JR Trading PVT Limited | Wholesale & retail | 2022 |
| JRA Music Ltd | Information & communication | 2022 |
| JRA Trading Ltd | Wholesale & retail | 2018 |
| JRC Property Investment Limited | Real estate | 2018 |
| JRC Property Solutions Ltd | Real estate | 2025 |
| JRL Catering Engineers Ltd | Manufacturing | 2023 |
| JRL Integration Limited | Information & communication | 2012 |
| Jrqez Rentals Ltd | Real estate | 2025 |
| JS 21 SPV Ltd | Construction | 2026 |
| JS Construction (Yorkshire) Ltd | Construction | 2022 |
| JS EHV Jointing and Services Limited | Construction | 2022 |
| JS Health and Safety Consultancy Ltd | Professional & scientific | 2023 |
| JS Inter Food Distribution Ltd | Hospitality | 2025 |
| JS International Food Distribution Ltd | Hospitality | 2025 |
| JS Investment Group Ltd | Financial services | 2025 |
| JS Jointing Limited | Construction | 2023 |
| JS L&D Consulting Ltd | Education | 2024 |
| JS Landscapes HD Ltd | Construction | 2025 |
| JS Landscaping (Yorkshire) Ltd | Administrative & support | 2023 |
| JS Motor Services (Huddersfield) Ltd | Other services | 2017 |
| JS Property Enterprise Ltd | Real estate | 2025 |
| JS Property Investments (Yorkshire) Limited | Real estate | 2021 |
| JS Sportsturf Ltd | Arts & recreation | 2025 |
| JS Tech Installations Limited | Construction | 2026 |
| JS Textile Ltd | Wholesale & retail | 2024 |
| JS Travel HD Ltd | Transport & logistics | 2024 |
| JSB Electrical Services and Controls Limited | Construction | 2010 |
| Jsbg Global UK Ltd | Transport & logistics | 2023 |
| JSP Joinery & Construction Ltd | Manufacturing | 2019 |
| JSX4 Limited | Real estate | 2019 |
| JT Agro Limited | Manufacturing | 2010 |
| JT Crop Limited | Administrative & support | 1998 |
| JT Lettings & Property Ltd | Real estate | 2022 |
| JTA Labs Ltd | Information & communication | 2026 |
| JTB Management Consultancy Ltd | Professional & scientific | 2018 |
| JTC Electrics Ltd | Construction | 2026 |
| JTD Professional Services Ltd | Manufacturing | 2023 |
| JTE Holdco Limited | Professional & scientific | 2014 |
| JTE Limited | Professional & scientific | 2025 |
| JTH Mistry Projects Ltd | Professional & scientific | 2026 |
| JTL Property Solutions Ltd | Real estate | 2021 |
| JTM Fire Protection Limited | Manufacturing | 2016 |
| JTR Workshop Limited | Manufacturing | 2021 |
| Jtrp Training Limited | Education | 2024 |
| Jubb Consultancy Limited | Information & communication | 2025 |
| Jubilee Property Limited | Real estate | 2024 |
| Jucoda Ltd | Wholesale & retail | 2024 |
| Judah Cleaning Services Ltd | Administrative & support | 2026 |
| Judge Hairdressing Ltd | Other services | 2019 |
| Judith Moritz Ltd | Information & communication | 2023 |
| Judyvin Properties Ltd | Real estate | 2023 |
| Juice Boardsports Limited | Wholesale & retail | 2013 |
| Juice Construction Limited | Administrative & support | 2024 |
| Juicy G'S Ltd | Hospitality | 2025 |
| Julia LEE Ltd | Education | 2012 |
| Julian Holmes Pension Trustee Limited | Financial services | 2014 |
| Julie ANN FOX Ltd | Administrative & support | 2019 |
| Jultinn Pharma Ltd | Health & social care | 2022 |
| JUN SU Limited | Hospitality | 2017 |
| Junction One (Golcar) Limited | Hospitality | 2009 |