| Jinnah Consultants Ltd | Professional & scientific | 2013 |
| Jiro & Soti Ltd | Health & social care | 2023 |
| Jivs Limited | Administrative & support | 2015 |
| Jj's Removals and Disposals Ltd | Water & waste | 2019 |
| JJO Services Limited | Other services | 2012 |
| JJP Lettings & Management Ltd | Real estate | 2025 |
| JJS Homes Limited | Real estate | 2023 |
| JK Health Solutions Ltd | Administrative & support | 2023 |
| JK Hopkins Limited | Transport & logistics | 2015 |
| JK Security and Cleaning Services Ltd | Administrative & support | 2021 |
| Jk&D Services Ltd | Professional & scientific | 2023 |
| JKB Crome Company Limited | Information & communication | 2015 |
| JKC Global Ltd | Wholesale & retail | 2024 |
| JKR Caters Ltd | Hospitality | 2024 |
| JKT Consultancy Ltd | Construction | 2022 |
| JL1V3 Ltd | Real estate | 2022 |
| JLA Accounts Limited | Professional & scientific | 2022 |
| Jlgrant Maintenance Associates Limited | Manufacturing | 2021 |
| Jlsd Quality Services Ltd | Transport & logistics | 2023 |
| JM Car Sevices Ltd | Transport & logistics | 2015 |
| JM Services(Uk) Limited | Construction | 2021 |
| JMC Auto Cars Limited | Wholesale & retail | 2024 |
| JMI GAS & Heating Ltd | Other services | 2020 |
| JMR Section Benders (Holdings) Ltd | Financial services | 2023 |
| JMR Section Benders Ltd | Manufacturing | 1953 |
| JMS Cars Ltd | Transport & logistics | 2023 |
| Jmsa Properties Ltd | Real estate | 2024 |
| JN Builders Ilford Ltd | Construction | 2024 |
| JN Gill Construction Ltd | Construction | 2026 |
| JNC Construction Ltd | Construction | 2023 |
| Jnjluxe Limited | Wholesale & retail | 2025 |
| Jobanb Limited | Transport & logistics | 2026 |
| Jobi Ventures Limited | Real estate | 2026 |
| Jobra Group Limited | Administrative & support | 2018 |
| Jodan Building Contractors Ltd | Construction | 2021 |
| JOE and Velma Limited | Transport & logistics | 2009 |
| JOE Global Ltd | Construction | 2021 |
| JOE KOZ Healthcare Limited | Health & social care | 2024 |
| Joealex Ltd | Health & social care | 2023 |
| Joebast Services Ltd | Other services | 2015 |
| Joen Construction Ltd | Construction | 2023 |
| Joesaph Limited | Wholesale & retail | 2012 |
| Joe’S International Ltd | Information & communication | 2025 |
| Jofet Properties Ltd | Real estate | 2024 |
| Jofetrise Consulting Limited | Professional & scientific | 2015 |
| Jogi Collection Ltd | Information & communication | 2024 |
| Johal Training and Assessment Services Ltd | Construction | 2020 |
| John & David's Ltd | Real estate | 2023 |
| John Adkins 92 Gold Ltd | Wholesale & retail | 2020 |
| John CIO Group Limited | Water & waste | 2017 |
| John General UK Construction Ltd | Construction | 2018 |
| Johnfax Ltd | Construction | 2020 |
| Johnkef Limited | Information & communication | 2017 |
| Johnson Fabrication (London) Limited | Manufacturing | 2020 |
| Join UNI Today Limited | Education | 2025 |
| Joinery Ltd Mario Ltd | Administrative & support | 2017 |
| Joisar Limited | Other services | 2014 |
| Jojoo Concept Limited | Wholesale & retail | 2017 |
| Jojra Limited | Construction | 2025 |
| JOK Healthcare Limited | Health & social care | 2014 |
| Jokeade Kare Services Limited | Health & social care | 2015 |
| Jolade Care Limited | Health & social care | 2018 |
| Jolade Consulting UK Ltd | Professional & scientific | 2016 |
| Jollof & Jerk Kitchen Ltd | Hospitality | 2026 |
| Jombo Consulting Ltd | Professional & scientific | 2016 |
| Jomek Limited | Health & social care | 2014 |
| JON23 Ltd | Transport & logistics | 2019 |
| Jonah Estates Ltd | Real estate | 2025 |
| Jonakparadise Limited | Wholesale & retail | 2025 |
| Jones Catering Limited | Hospitality | 2024 |
| Jonsim Construction Ltd | Construction | 2025 |
| Jonu Transport Ltd | Transport & logistics | 2026 |
| Joomera Ltd | Professional & scientific | 2023 |
| Jopharm Limited | Administrative & support | 2023 |
| Joraustine Ltd | Administrative & support | 2022 |
| Jordan Solution Ltd | Construction | 2024 |
| Jorla Integrated Services Ltd | Education | 2025 |
| Joros Logistics Ltd | Transport & logistics | 2024 |
| Josco Decorating Limited | | 1999 |
| Josebu Limited | Administrative & support | 2015 |
| Joshintuveed Limited | Administrative & support | 2019 |
| Joshua Aderinto Ltd | Professional & scientific | 2023 |
| Josie Properties Limited | Real estate | 2020 |
| Joskn Ltd | Wholesale & retail | 2024 |
| Joso Enterprise Ltd | Construction | 2020 |
| Jostee Ltd | Real estate | 2019 |
| Jotlu Ltd | Information & communication | 2025 |
| Jovani Ltd | Construction | 2017 |
| Joy Adenuga Ltd | Other services | 2015 |
| Joy Home Care Services Ltd | Health & social care | 2024 |
| Joyak Services Ltd | Health & social care | 2021 |
| Joyful Living Property Limited | Real estate | 2022 |
| JP Projects Construction Limited | Construction | 2021 |
| JP Supplier Ltd | Wholesale & retail | 2021 |
| Jp&Zp Construction Limited | Construction | 2023 |
| JPK Goods Limited | Wholesale & retail | 2023 |
| Jplacedit Ltd | Other services | 2023 |
| JPR Property Investments Ltd | Financial services | 2024 |
| JR Entertainment Promotion International Limited | Arts & recreation | 2013 |
| JR Master Solution London Ltd | Construction | 2017 |