| JB Trimz Ltd | Other services | 2026 |
| JBB Investments Limited | Real estate | 2013 |
| JBB Real Estate Limited | Real estate | 2024 |
| Jbci Limited | Real estate | 2020 |
| Jbdy 2002 Private Limited | Professional & scientific | 2024 |
| Jbez Ventures Ltd | Real estate | 2021 |
| Jbrd Developments Limited | Construction | 2025 |
| JC Beauty London Ltd. | Wholesale & retail | 2018 |
| JC Plumbing Heating & GAS Service Limited | Construction | 2016 |
| Jcmt Music Ltd | Information & communication | 2020 |
| JCO Security Ltd | Construction | 2009 |
| JD Art Ltd | Other services | 2018 |
| JD Bhingradiya Limited | Wholesale & retail | 2025 |
| JD Wolk Limited | Transport & logistics | 2018 |
| JDH Detailing Limited | Other services | 2026 |
| Jdrk Holdings Ltd | Real estate | 2022 |
| JDY Management Limited | Real estate | 2022 |
| Jdyl Limited | Construction | 2020 |
| Jeff Consulting Limited | Professional & scientific | 2024 |
| Jeffrey Management Limited | Real estate | 1991 |
| Jehanz Ltd | Wholesale & retail | 2024 |
| JEM Compliance Solutions Limited | Financial services | 2011 |
| Jemstone Properties Limited | Real estate | 1959 |
| Jemworld Limited | Extraterritorial | 2011 |
| Jemz Consulting Ltd | Other services | 2017 |
| Jenash Ltd | Administrative & support | 2016 |
| Jencall Films Ltd | Information & communication | 2011 |
| Jenga Property Limited | Real estate | 2020 |
| Jenlor Limited | Professional & scientific | 2023 |
| Jenni PAT Limited | Wholesale & retail | 2025 |
| Jennifer's Nails CM Ltd | Other services | 2025 |
| Jerv Management Ltd | Professional & scientific | 2024 |
| Jeshvi Limited | Wholesale & retail | 2024 |
| Jesse Davis Antiques Limited | Wholesale & retail | 2012 |
| Jessy Ltd | Other services | 2024 |
| Jeta Construction Limited | Construction | 2019 |
| Jewel Flare Ltd | Wholesale & retail | 2024 |
| Jewel of Kashmir Imports Limited | Wholesale & retail | 2003 |
| Jewelco London Limited | Information & communication | 2009 |
| Jewellery Supermarket Limited | Wholesale & retail | 2020 |
| Jewish Association for Business Ethics | Health & social care | 1994 |
| Jewish Impact Limited | Education | 2013 |
| Jeyanthi and Group Ltd | Wholesale & retail | 2019 |
| JFA Enterprise Ltd | Professional & scientific | 2017 |
| Jfstone Ltd | Construction | 2024 |
| JGM Dental Limited | Health & social care | 2012 |
| JHD Logistics Ltd | Transport & logistics | 2014 |
| Jheast Limited | Arts & recreation | 2026 |
| Jheeta Holdings Limited | Financial services | 2025 |
| Jhon Electrical Limited | Construction | 2018 |
| JHP Consultants Ltd | Professional & scientific | 2020 |
| JI Chicken Bang Bang Limited | Hospitality | 2025 |
| Jiani Limited | Wholesale & retail | 2008 |
| JIK Logistics Ltd | Transport & logistics | 2020 |
| Jikan Limited | Administrative & support | 2008 |
| Jimmy Hunt Limited | Information & communication | 2015 |
| Jink Services Limited | Real estate | 2017 |
| Jits Construction Limited | Construction | 2022 |
| JJ Consulting Services Ltd | Administrative & support | 2017 |
| JJ Music Group Ltd | Professional & scientific | 2024 |
| JJ Recovery Coaching Ltd | Health & social care | 2025 |
| Jj&Sm Catering Limited | Hospitality | 2020 |
| Jjlz Investments Ltd | Real estate | 2021 |
| Jjlz Properties Ltd | Real estate | 2026 |
| JJP Engineering Ltd | Information & communication | 2022 |
| JK Assets Ltd | Real estate | 2021 |
| JK Heritage Limited | Wholesale & retail | 2026 |
| JK Integration Consultants Limited | Information & communication | 2017 |
| JK Property Partners Limited | Real estate | 2020 |
| JK the Barber Limited | Other services | 2015 |
| JK the Barber Studios Limited | Other services | 2024 |
| JKH Investments Limited | Real estate | 2011 |
| JKL Jeya Limited | Health & social care | 2021 |
| Jknas Limited | Professional & scientific | 2025 |
| JKT Property Ltd | Real estate | 2020 |
| JL Events Ltd | Construction | 2025 |
| JLH Management Ltd | Professional & scientific | 2024 |
| Jljb Limited | Administrative & support | 2021 |
| JLM Collective Ltd | Real estate | 2026 |
| JLR TV Ltd | Information & communication | 2024 |
| JM & AP Consultants Limited | Extraterritorial | 2024 |
| JM Heating Services Limited | Construction | 2017 |
| JM Logistics Transportation Limited | Transport & logistics | 2019 |
| JMA Investment Ltd | Real estate | 2020 |
| Jmdy Investments Ltd | Real estate | 2023 |
| Jmmg Consulting Limited | Professional & scientific | 2025 |
| JMN Property Management Ltd | Real estate | 2023 |
| Jmvg Ltd | Real estate | 2020 |
| Jobbees Ltd | Information & communication | 2017 |
| Jobees Tech Ltd | Information & communication | 2025 |
| Jobtion Ltd | Administrative & support | 2014 |
| Joco Holdings Ltd | Financial services | 2025 |
| Joesam Investments Limited | Real estate | 2017 |
| Jogi Maintenance London Ltd | Construction | 2025 |
| John Barnes Sushi Ltd | Hospitality | 2020 |
| John Cameron Music Limited | Arts & recreation | 1973 |
| John Cameron Productions Limited | Professional & scientific | 2003 |
| John Davies Landscape Limited | Administrative & support | 2014 |
| John Dibble Fashions Limited | Professional & scientific | 2002 |
| John Pullinger Limited | Administrative & support | 2019 |