| J Virk Properties Limited | Real estate | 2019 |
| J W Cleaning Professionals Limited | Administrative & support | 2024 |
| J&D RAJ Transport Ltd | Transport & logistics | 2018 |
| J&D's World Industries Limited | Financial services | 2008 |
| J&D’S World Investments Ltd | Real estate | 2025 |
| J&G Property Group Ltd | Real estate | 2022 |
| J&H Developments (Midlands) Ltd | Real estate | 2025 |
| J&Hm Limited | Professional & scientific | 2017 |
| J&J Dream Homes Ltd | Real estate | 2024 |
| J&Jons Logistics Limited | Transport & logistics | 2022 |
| J&Klemanski Ltd | Administrative & support | 2016 |
| J&L Automotive Services Ltd | Wholesale & retail | 2023 |
| J&L Heating Ltd | Construction | 2019 |
| J&M Elite Services Limited | Information & communication | 2026 |
| J&N Property Derby Limited | Real estate | 2025 |
| J&P Estate Lands Ltd | Agriculture & fishing | 2020 |
| J&S Contractors Limited | Construction | 2022 |
| J&S Pawar Transport Limited | Transport & logistics | 2019 |
| J'Avance Developments Limited | Construction | 2014 |
| J-D Performance Limited | Wholesale & retail | 2004 |
| J. & a. Limited | Professional & scientific | 1984 |
| J. C. Hydro Ltd | Energy | 2008 |
| J. Howitt Building Limited | Construction | 2012 |
| J. Kelly Flooring Limited | Construction | 2019 |
| J. Overcuks Engineering Ltd | Manufacturing | 2016 |
| J. P. Pridmore Limited | Financial services | 2003 |
| J. Sheekey Communications Ltd | Professional & scientific | 2016 |
| J. Snow & Associates Limited | Financial services | 2022 |
| J. W. Andrews (Builders) Limited | Construction | 1983 |
| J. Woodward (Decorators) Limited | Wholesale & retail | 1967 |
| J.A. Mcdonagh Engineering Limited | Manufacturing | 1977 |
| J.A.L Roofing Limited | Construction | 2009 |
| J.A.P Ventures Limited | Real estate | 2025 |
| J.B. Carpets (London) Limited | Wholesale & retail | 2014 |
| J.B. England & SON Ltd. | Water & waste | 1999 |
| J.B. Richardson Furnishers Limited | Transport & logistics | 1954 |
| J.Bell Rolling Stock Limited | Construction | 2019 |
| J.Callum Building and Joinery Limited | Construction | 2019 |
| J.E. Archer & Sons (Farmers) Limited | Agriculture & fishing | 1975 |
| J.G.Bestwick Limited | Wholesale & retail | 1956 |
| J.K. Fashions (Derby) Limited | Wholesale & retail | 1995 |
| J.K. International Limited | Wholesale & retail | 1991 |
| J.K. Welding Ltd | Manufacturing | 2024 |
| J.Meela Ltd | Health & social care | 2024 |
| J.P Interiors (Chesterfield) Ltd | Construction | 2022 |
| J.S. Perry & SON Joinery Limited | Construction | 2006 |
| J.S. Player (Holdings) Limited | | 1973 |
| J.S.M. XU Engineering Limited | Professional & scientific | 2018 |
| J.Seamer & SON Limited | Construction | 1951 |
| J.Snow & Associates (Holdings) Limited | Financial services | 2022 |
| J.Snow & Associates 2 Limited | Financial services | 2025 |
| J.V.N Services Ltd | Professional & scientific | 2020 |
| J1 Builders Ltd | Construction | 2022 |
| J1 Hub Ltd | Wholesale & retail | 2025 |
| J11 Group Ltd | Wholesale & retail | 2025 |
| J11 Hub Ltd | Transport & logistics | 2026 |
| J2 Limited | Professional & scientific | 2004 |
| J24 Homes Ltd | Health & social care | 2024 |
| J24 Resourcing Limited | Health & social care | 2015 |
| JA Commercial Consultants Ltd | Professional & scientific | 2018 |
| JA Food and Wine Limited | Wholesale & retail | 2026 |
| JA Health Group Ltd | Professional & scientific | 2026 |
| JA Moore Developments Ltd | Construction | 2024 |
| JA Precision Limited | Manufacturing | 2010 |
| JA Spicy Food Ltd | Hospitality | 2023 |
| JA Trustee Services Limited | Professional & scientific | 2002 |
| Jaan by ORA Ltd | Wholesale & retail | 2021 |
| Jaayem Limited | Wholesale & retail | 2025 |
| Jacinta Holding UK Ltd | Real estate | 2025 |
| Jack & SAM Holdings Limited | Financial services | 2026 |
| Jack in the Box Nursery (Norfolk) Ltd | Education | 2011 |
| Jack Martin Engineering Ltd | Manufacturing | 2019 |
| Jack Street Works Ltd | Construction | 2026 |
| Jack the Cleaner Ltd | Administrative & support | 2022 |
| Jack W Limited | Construction | 2024 |
| Jack Walsh & SON Limited | Extraterritorial | 1999 |
| Jacks Construction Ltd | Construction | 2021 |
| Jackson Catering Services Limited | Hospitality | 2019 |
| Jackson Consulting Engineers Limited | Professional & scientific | 2009 |
| Jackson Geophysical Associates Limited | Professional & scientific | 2016 |
| Jackson Giles Ltd | Professional & scientific | 2025 |
| Jackson Washroom Services Limited | Other services | 1999 |
| Jackstone Froster Ltd | Extraterritorial | 2019 |
| Jacob Belles Holdings Ltd | Arts & recreation | 2023 |
| Jacob's Well (Derby) | Health & social care | 1998 |
| Jacobs and SON Express Ltd | Wholesale & retail | 2018 |
| Jacobs Payne & Parry Financial Services Ltd | Financial services | 2005 |
| JAD (Derby) Limited | Health & social care | 2010 |
| Jade (Eco) Ltd | Agriculture & fishing | 2026 |
| Jade Mountain Property Limited | Real estate | 2019 |
| Jade Shaw Limited | Wholesale & retail | 2025 |
| Jaffer Trading Solutions Ltd | Wholesale & retail | 2024 |
| JAG Investments (Derby) Limited | Construction | 2007 |
| JAG Sull Property Ltd | Real estate | 2026 |
| Jagir Singh & Sons Limited | Real estate | 2019 |
| JAI Housing Ltd | Real estate | 2016 |
| Jaikai Cresco Ltd | Wholesale & retail | 2020 |
| Jaiyen Muay Thai Ltd | Arts & recreation | 2023 |
| JAK Bros Engineering Limited | Manufacturing | 2024 |
| JAK Engineering Ltd | Professional & scientific | 2017 |