| Jordanthorpe Food & Wine Nisa Local Limited | Wholesale & retail | 2013 |
| JOS Business Services Ltd | Professional & scientific | 2018 |
| Jose Building Ltd | Construction | 2019 |
| Jose Galarraga Transport Ltd | Transport & logistics | 2013 |
| Joseph Barker Plumbing and Heating Ltd | Construction | 2022 |
| Joseph Brett Limited | Wholesale & retail | 2007 |
| Joseph Electrical Limited | Construction | 2021 |
| Joseph Executive Search (Export) Limited | Administrative & support | 2018 |
| Joseph Executive Search Limited | Administrative & support | 2010 |
| Joseph Marples Limited | Manufacturing | 1976 |
| Joseph Powell-Worth Property Development Limited | Construction | 2025 |
| Joseph Rodgers & Sons Limited | Professional & scientific | 1986 |
| Joseph Smith Logistics Limited | Transport & logistics | 2025 |
| Joseph Tyzack and SON Limited | Extraterritorial | 1997 |
| Josh Morton Accounting Services Ltd | Administrative & support | 2026 |
| Josh Pubs Ltd | Hospitality | 2024 |
| Joshua J Knowles Limited | Arts & recreation | 2016 |
| Joshua Shelley Property Development Ltd | Real estate | 2024 |
| Josko Marian Limited | Transport & logistics | 2026 |
| Josp Coaching Ltd | Education | 2025 |
| Jott Europe Limited | Wholesale & retail | 2006 |
| Joule Generation Energy Services Ltd | Construction | 2022 |
| Joule Generation Limited | Professional & scientific | 2020 |
| Journeyman Inns Ltd | Hospitality | 2026 |
| Joy Blessing Limited | Health & social care | 2018 |
| Joy by Design Limited | Wholesale & retail | 2006 |
| Joy Motors Ltd | Wholesale & retail | 2020 |
| Joycee Gifts Ltd | Wholesale & retail | 2025 |
| Joyful African Store Limited | Wholesale & retail | 2025 |
| Joyful Choice Department Store Ltd | Wholesale & retail | 2025 |
| Joyful Cleaning Ltd | Administrative & support | 2021 |
| Joyful Noise Music Ltd | Information & communication | 2023 |
| Joyful Space Limited | Real estate | 2025 |
| Joyriiders Ltd | Information & communication | 2025 |
| Joysaves Limited | Wholesale & retail | 2025 |
| Joyson Limited | Financial services | 2021 |
| Joyton Leisure Limited | Transport & logistics | 2019 |
| Jozak Ltd | Hospitality | 2020 |
| JP & SG Developments Limited | Real estate | 2026 |
| JP Construction (SY) Limited | Construction | 2018 |
| JP Estate Management Ltd | Real estate | 2019 |
| JP Exhausts Ltd | Manufacturing | 2018 |
| JP Lettings Limited | Real estate | 2014 |
| JP Mooney Construction Limited | Construction | 2019 |
| JP Mooney Limited | Construction | 2005 |
| JP Network Ltd | Transport & logistics | 2023 |
| JP Painting and Decorating Ltd | Construction | 2019 |
| JP Scrap Solutions Ltd | Water & waste | 2026 |
| JP Solutions (Sheffield) Ltd | Public administration | 2020 |
| JP Windows Ltd | Other services | 2017 |
| JP-556 Limited | Transport & logistics | 2025 |
| JPA Machinery Ltd | Wholesale & retail | 2022 |
| Jpac Elite Sports Coaching CIC | Education | 2015 |
| JPB Construction Limited | Construction | 2020 |
| JPC 668 Limited | Hospitality | 2021 |
| Jpen Ltd | Health & social care | 2025 |
| JPH Deliveries Ltd | Transport & logistics | 2016 |
| JPH Estates Ltd | Real estate | 2022 |
| JPK Health Ltd | Health & social care | 2023 |
| JPL Plumbing & Heating Yorkshire Ltd | Construction | 2022 |
| Jplusuk Ltd | Wholesale & retail | 2021 |
| JPM Estate Agents Limited | Real estate | 2021 |
| JPM Facilities Management Limited | Other services | 2017 |
| JPM Financial Holdings Ltd | Financial services | 2024 |
| JPM Financial Management Limited | Financial services | 2009 |
| JPM Property Management Limited | Real estate | 2017 |
| Jpmp Properties Ltd | Real estate | 2024 |
| JPP Autos Ltd | Wholesale & retail | 2019 |
| JPR Industrial Services Limited | Manufacturing | 2011 |
| JPS (UK) Properties Ltd | Real estate | 2001 |
| JPS Broadcast Ltd | Information & communication | 2023 |
| JPS Firelex Ltd | Public administration | 2021 |
| JPS Management Consultancy Ltd | Professional & scientific | 2024 |
| JPS Property Holdings Limited | Real estate | 2018 |
| JQ Engineering Ltd | Professional & scientific | 2025 |
| Jqpp Ltd | Real estate | 2017 |
| JR Deliveries Limited | Transport & logistics | 2025 |
| JR Flooring Installations Limited | Construction | 2026 |
| JR Plumbing and Heating Ltd | Construction | 2026 |
| JR Ramps Limited | Manufacturing | 2025 |
| JR Smart Properties Ltd | Real estate | 2023 |
| Jrah Computing Limited | Information & communication | 1996 |
| JRB Driving Services Ltd | Transport & logistics | 2016 |
| JRB Homes Ltd | Construction | 2016 |
| JRB Security Solutions Ltd | Manufacturing | 2026 |
| JRD Property Services Ltd | Real estate | 2016 |
| JRD Property Solutions Ltd | Real estate | 2022 |
| JRH Business Services Limited | Professional & scientific | 2020 |
| JRH Property Maintenance Limited | Construction | 2002 |
| JRH Refrigeration Ltd | Construction | 2021 |
| JRI (Manufacturing) Limited | Professional & scientific | 1977 |
| JRI Orthopaedics Limited | Manufacturing | 1970 |
| Jrml Property Holdings Limited | Real estate | 2024 |
| JRO Electrics Limited | Construction | 2018 |
| JRO Property Development Limited | Construction | 2025 |
| Jrootsbarsltd Ltd | Hospitality | 2023 |
| Jrootspubs Ltd | Hospitality | 2018 |
| JRP Surface Design Ltd | Construction | 2022 |
| Jrrien Ltd | Wholesale & retail | 2013 |
| JRS GAS and Plumbing Services Limited | Construction | 2008 |