| Jbrr Ltd | Extraterritorial | 2016 |
| Jbrw Real Estate Ltd | Real estate | 2019 |
| JBT Leisure Ltd | Hospitality | 2015 |
| JC & H Industries Ltd | Financial services | 2020 |
| JC Advertising Ltd | Wholesale & retail | 2022 |
| JC Asset Management Ltd | Financial services | 2018 |
| JC Assets Limited | Professional & scientific | 2025 |
| JC Cabling Ltd | Information & communication | 2019 |
| JC Construction & Maintenance Ltd | Construction | 2017 |
| JC Detailing Ltd | Wholesale & retail | 2026 |
| JC Farming Ltd | Agriculture & fishing | 2016 |
| JC Hair Design Ltd | Other services | 2023 |
| JC Landscapes & Arboriculture Limited | Administrative & support | 2020 |
| JC Painting Limited | Construction | 2025 |
| JC Stainless Fabrications Limited | Manufacturing | 2021 |
| JC Vans Ltd | Wholesale & retail | 2015 |
| Jc's Pc's Ltd. | Information & communication | 1995 |
| Jcane Ltd | Other services | 2016 |
| JCB Capital Limited | Real estate | 2017 |
| JCB Contracting Services Ltd | Administrative & support | 2019 |
| JCB Roofing Limited | Construction | 2015 |
| JCE Fabrications Limited | Manufacturing | 2007 |
| JCG Ventures Limited | Administrative & support | 2014 |
| JCH Estates Limited | Real estate | 2026 |
| JCM Automotive Engineers Ltd | Wholesale & retail | 2010 |
| Jcme Quantum Ltd | Professional & scientific | 2022 |
| JCN Garden Services Ltd | Administrative & support | 2024 |
| JCO Engineering Services Limited | Manufacturing | 2019 |
| Jcontreras Limited | Health & social care | 2020 |
| JCS Estate Management Ltd | Real estate | 2026 |
| JCS Transport Consultancy (Surrey) Ltd | Professional & scientific | 2021 |
| JCT23 Ltd | Health & social care | 2023 |
| JCY Exterior Cleaning Ltd | Administrative & support | 2024 |
| JCZ Engineering Ltd | Manufacturing | 2019 |
| JD and JO Properties Limited | Real estate | 2023 |
| JD Culture Ltd | Wholesale & retail | 2025 |
| JD Designer Ltd | Professional & scientific | 2025 |
| JD Home Improvements & Roofing Ltd | Construction | 2025 |
| JD Intolerance Testing Ltd | Health & social care | 2023 |
| JD Kuzba Properties Ltd | Real estate | 2025 |
| JD Recruitment Services Limited | Professional & scientific | 2022 |
| JD Security Services Ltd | Administrative & support | 2021 |
| JD2019 Ltd | Professional & scientific | 2019 |
| Jdavid Boxing and Fitness Ltd | Education | 2023 |
| JDC Property & Lettings Ltd | Real estate | 2025 |
| Jdconstruction Projects Ltd | Extraterritorial | 2019 |
| JDE TOCAN18 Ltd | Construction | 2019 |
| JDG Property Management Ltd | Real estate | 2024 |
| JDG S.W. Coaching LLP | | 2024 |
| JDH Property Management Limited | Professional & scientific | 2008 |
| Jdkmart Ltd | Wholesale & retail | 2025 |
| JDL Property Care Ltd | Construction | 2026 |
| JDL Racing Limited | Arts & recreation | 2024 |
| Jdmercy Ltd | Financial services | 2020 |
| JDP Fitness Limited | Administrative & support | 2017 |
| JDP Fitness Studios Ltd | Arts & recreation | 2019 |
| JDR Promotions Ltd | Arts & recreation | 2012 |
| JDS Brands Ltd | Wholesale & retail | 2021 |
| JDS Commercial Cleaners of London Ltd | Administrative & support | 2018 |
| JDS Fire & Security Solutions Limited | Manufacturing | 2013 |
| JDS Investments (Cardiff) Limited | Financial services | 2014 |
| JDS Investments (South Wales) Limited | Financial services | 2015 |
| JDS Property Partners Ltd | Real estate | 2025 |
| JDS Solutions Ltd | Wholesale & retail | 2023 |
| JDS Trading Limited | Extraterritorial | 2014 |
| JE Contractors Limited | Professional & scientific | 2017 |
| JE Electrical Solutions Ltd | Construction | 2026 |
| JE Planning Limited | Professional & scientific | 2025 |
| JE QS Limited | Professional & scientific | 2010 |
| JE Sports Management Ltd | Arts & recreation | 2017 |
| JEA Sun Ltd | Real estate | 2020 |
| Jeal Consulting Ltd | Information & communication | 2018 |
| Jean Elizabeth Cullen Ltd | Extraterritorial | 2025 |
| Jean-Paul Staniforth Limited | Wholesale & retail | 2025 |
| Jeanpaul Gotch Ltd | Wholesale & retail | 2026 |
| Jeans & JIO Ltd | Wholesale & retail | 2025 |
| Jeds Consultants Ltd | Wholesale & retail | 2016 |
| Jeet (UK) Limited | Real estate | 2004 |
| Jeet Payro Work Ltd | Professional & scientific | 2025 |
| Jeeva Wellness Limited | Health & social care | 2019 |
| Jeevika Properties Limited | Real estate | 2023 |
| Jefe's Motors Ltd | Wholesale & retail | 2025 |
| Jefes Corporation Ltd | Other services | 2024 |
| Jefes Product Ltd | Other services | 2025 |
| Jeff Ball Gates 'N' Railings Limited | Manufacturing | 2026 |
| Jeff Dick Limited | Real estate | 2017 |
| Jeffel Security Ltd | Other services | 2025 |
| Jeffrey Richard Limited | Real estate | 2018 |
| Jeffrey Ross and Knights Limited | Real estate | 2023 |
| Jeffrey Ross and the Property Outlet Ltd | Real estate | 2006 |
| Jeffrey Ross Limited | Real estate | 2007 |
| Jefia Limited | Other services | 2023 |
| JEG Building Solutions Ltd | Construction | 2011 |
| Jego Salon Limited | Other services | 2019 |
| Jehu Project Services Limited | Construction | 1995 |
| Jekyo Ltd | Information & communication | 2021 |
| Jelajo Limited | Other services | 2006 |
| Jellani Ltd | Manufacturing | 2018 |
| Jellyfish Business Solutions Ltd | Other services | 2019 |
| Jellyjolly London Ltd Ltd | Wholesale & retail | 2019 |