| Jimmy Wong Studio Ltd | Arts & recreation | 2024 |
| Jimoon Ltd | Financial services | 2022 |
| JIN Ling Limited | Hospitality | 2022 |
| Jingle JAM Promotions Ltd | Other services | 2022 |
| Jinkink Limited | Hospitality | 2007 |
| Jiri Consulting Limited | Information & communication | 2013 |
| Jiri Properties Limited | Real estate | 2022 |
| Jisc | Other services | 2006 |
| Jisc Commercial Limited | Information & communication | 2014 |
| Jisc Services Limited | Information & communication | 1993 |
| Jishui Solar Ltd | Energy | 2022 |
| Jist Consulting Ltd | Professional & scientific | 2020 |
| Jitchez Limited | Health & social care | 2016 |
| Jivshanti Private Company Limited | Health & social care | 2024 |
| Jiya Enterprise Ltd | Wholesale & retail | 2021 |
| Jiyan Catering Limited | Hospitality | 2017 |
| JJ Aesthetics & Beauty Ltd | Other services | 2026 |
| JJ Autocare Limited | Wholesale & retail | 2025 |
| JJ Bakery Limited | Manufacturing | 2024 |
| JJ DRY Cleaners and Laundry Service Ltd | Administrative & support | 2023 |
| JJ Retail Group Ltd | Wholesale & retail | 2025 |
| JJ Sportstech Ltd | Information & communication | 2024 |
| JJ Trades Ltd | Wholesale & retail | 2025 |
| JJ Trading Ltd | Arts & recreation | 2026 |
| Jj&U Ltd | Administrative & support | 2024 |
| Jj.Net Limited | Information & communication | 2008 |
| JJB Capital Ltd | Financial services | 2024 |
| JJB Engineering Services Ltd | Manufacturing | 2025 |
| JJB Residential Ltd | Real estate | 2024 |
| JJC Advisory Ltd | Professional & scientific | 2020 |
| JJC Carpentry Limited | Manufacturing | 2022 |
| JJD Accounting Services Ltd | Professional & scientific | 2023 |
| JJD Consultants Ltd | Professional & scientific | 2026 |
| Jjengineering Specialists Limited | Professional & scientific | 2024 |
| Jjfox Limited | Administrative & support | 2004 |
| Jjfufillment Ltd | Wholesale & retail | 2024 |
| JJH Telecom Services Limited | Information & communication | 2025 |
| JJK Heating & Plumbing Ltd | Construction | 2015 |
| JJM Consultancy Services UK Ltd | Professional & scientific | 2024 |
| JJN Ltd | Hospitality | 2026 |
| Jjnp Services Limited | Health & social care | 2018 |
| JJP Aerospace Ltd | Professional & scientific | 2024 |
| JJS Building Limited | Construction | 2018 |
| Jjse Ltd | Construction | 2015 |
| Jjss Foodhouse Ltd | Hospitality | 2026 |
| JJT Family Investments Limited | Real estate | 2024 |
| JJT Rentals Ltd | Real estate | 2024 |
| Jjtp Limited | Arts & recreation | 2018 |
| JJW Contracts Bristol Ltd | Construction | 2024 |
| JJW Productions Ltd | Information & communication | 2014 |
| Jjxr Ltd | Information & communication | 2022 |
| JK Beauty Limited | Other services | 2012 |
| JK Campervans Limited | Administrative & support | 2024 |
| JK Convenience Store Limited | Wholesale & retail | 2015 |
| JK Homes & Properties LLP | | 2026 |
| JK Properties (Bristol) Ltd | Hospitality | 2019 |
| JK Sathi Estates Ltd | Real estate | 2025 |
| JK Sathi Properties Ltd | Real estate | 2024 |
| Jkap Cameras Ltd | Information & communication | 2022 |
| JKL Editing Limited | Information & communication | 2015 |
| Jklm Limited | Other services | 2018 |
| JKM Textile Trading Limited | Wholesale & retail | 2024 |
| Jkmarca Ltd | Wholesale & retail | 2025 |
| Jkpr Ltd | Professional & scientific | 2026 |
| JKR Homes Ltd | Real estate | 2017 |
| JKR Plastering Services Limited | Construction | 2015 |
| Jkrs Homes Limited | Construction | 2021 |
| JKS Property Ventures Ltd | Real estate | 2024 |
| Jksgears Ltd | Wholesale & retail | 2020 |
| JL Corporate Limited | Wholesale & retail | 2025 |
| JL Finance Limited | Manufacturing | 2014 |
| JL Future Homes Ltd | Real estate | 2020 |
| JL Geophysical Limited | Professional & scientific | 2014 |
| JL Grace Consultancy Ltd | Professional & scientific | 2023 |
| JL Harmony House Ltd | Real estate | 2024 |
| JL Mechanical Services Ltd | Wholesale & retail | 2026 |
| JL Properties South West Ltd | Real estate | 2017 |
| JLA Residential LLP | | 2025 |
| JLB Elite Distribution Limited | Manufacturing | 2021 |
| Jlbs Properties Limited | Real estate | 2020 |
| JLC (Bristol) Ventures Ltd | Construction | 2023 |
| JLC Distribution (Bristol) Limited | Extraterritorial | 2020 |
| JLC Distribution Ltd | Wholesale & retail | 2010 |
| JLC Property Solutions Ltd | Real estate | 2025 |
| JLC Tiling Ltd | Construction | 2019 |
| JLC TV Limited | Information & communication | 2023 |
| JLD Group Limited | Real estate | 2016 |
| JLE DSP Ltd | Transport & logistics | 2026 |
| JLF Consulting Ltd | Professional & scientific | 2022 |
| JLG Building Services Limited | Construction | 2017 |
| Jljc Trading Ltd | Wholesale & retail | 2023 |
| Jljs Developments Ltd | Real estate | 2026 |
| JLM Care Ltd | Health & social care | 2024 |
| Jlove Marketing Limited | Administrative & support | 2023 |
| JLR Products Limited | Wholesale & retail | 2022 |
| JLS Painttech Limited | Construction | 2015 |
| JLS Property Management Ltd | Real estate | 2023 |
| JLT Broadwater Ltd | Real estate | 2022 |
| JLT Limited | Construction | 2023 |
| JM & Sons Logistic Limited | Transport & logistics | 2016 |