| JID1 Solutions Ltd | Information & communication | 2011 |
| Jignesh Property Limited | Real estate | 2021 |
| Jigsaw Property Services (Bedfordshire) Ltd | Construction | 2020 |
| Jigsaw RS Ltd | Other services | 2019 |
| JIM Pike Ltd | Administrative & support | 2022 |
| Jimmy's Takeout Limited | Hospitality | 2024 |
| Jimmyola Limited | Extraterritorial | 2017 |
| Jimmys Tyres Limited | Wholesale & retail | 2023 |
| Jingu Express Ltd | Transport & logistics | 2026 |
| Jinoo Holdings Limited | Information & communication | 2026 |
| JINYU365 UK Ltd | Hospitality | 2020 |
| JJ & JA Property Limited | Real estate | 2026 |
| JJ & MK Accountants Ltd | Professional & scientific | 2015 |
| JJ Coaches Ltd | Transport & logistics | 2025 |
| JJ Convenience Store Ltd | Wholesale & retail | 2025 |
| JJ Drylining Ltd | Construction | 2023 |
| JJ Fibre Limited | Information & communication | 2022 |
| JJ Food Store Limited | Wholesale & retail | 2007 |
| JJ Group Investments Ltd | Real estate | 2023 |
| JJ HPV Ltd | Construction | 2025 |
| JJ Sparkle Clean Ltd | Administrative & support | 2019 |
| JJ Stewart Ltd | Professional & scientific | 2021 |
| JJ Tech Ltd | Wholesale & retail | 2024 |
| Jj&Dd Essentials Limited | Wholesale & retail | 2025 |
| JJC Elite Ltd | Real estate | 2022 |
| JJC Property Solution Ltd | Real estate | 2025 |
| Jjcr Service Limited | Transport & logistics | 2023 |
| JJE Global Limited | Real estate | 2024 |
| JJF Properties Limited | Real estate | 2020 |
| JJJ Bros Limited | Real estate | 2021 |
| Jjjv Property Investment Ltd | Financial services | 2023 |
| JJK Investments Ltd | Other services | 2008 |
| JJM Services Group+ Ltd | Wholesale & retail | 2026 |
| Jjmc Plastering Ltd | Construction | 2022 |
| JJS Pizza and Peri Peri Express Limited | Hospitality | 2018 |
| JJS Property Ventures Ltd | Real estate | 2022 |
| Jjsh Holdings Ltd | Professional & scientific | 2021 |
| JJT Logistics Ltd | Transport & logistics | 2018 |
| JJV W Group Limited | Wholesale & retail | 2026 |
| JJW Estates Ltd | Real estate | 2016 |
| JK Emerald Ltd | Professional & scientific | 2018 |
| JK Professional Consulting Services Ltd | Professional & scientific | 2020 |
| JK Taiwo and Sons Limited | Health & social care | 2014 |
| JK Transport Solutions Limited | Transport & logistics | 2024 |
| JK Tyres and Motor Trader Ltd | Manufacturing | 2024 |
| Jk&A Properties Ltd | Real estate | 2024 |
| Jkaelysa Ltd | Health & social care | 2023 |
| JKJ Resources Ltd | Extraterritorial | 2005 |
| Jklm Properties Ltd | Real estate | 2022 |
| JKR Housing Limited | Real estate | 2017 |
| JKS Luton Ltd | Arts & recreation | 2019 |
| Jksoy Investments Ltd | Real estate | 2020 |
| JKW Carpentry & Building Limited | Construction | 2013 |
| JKZ Hub Limited | Professional & scientific | 2026 |
| JKZ Plastering Ltd | Construction | 2015 |
| JL Direct Ltd | Professional & scientific | 2021 |
| JL E-Commerce Limited | Wholesale & retail | 2020 |
| JL Logistics Services Ltd | Transport & logistics | 2017 |
| JL Support Services Ltd | Financial services | 2019 |
| Jlas-Holdings Ltd | Real estate | 2024 |
| Jlbeatsprods Limited | Information & communication | 2025 |
| JLF Properties Limited | Real estate | 2015 |
| JLG Healthcare Ltd | Health & social care | 2019 |
| JLI Investments Holdings Ltd | Real estate | 2025 |
| JLL Home Solutions Ltd | Real estate | 2026 |
| JLL Invest Ltd | Real estate | 2026 |
| JLM Living Ltd | Real estate | 2024 |
| JLS Neuro-Pro Limited | Health & social care | 2017 |
| JLT Properties Ltd | Real estate | 2021 |
| JM & S Services Ltd | Administrative & support | 2023 |
| JM Design & Build Limited | Construction | 2016 |
| JM Electrical & GAS Services Ltd | Construction | 2023 |
| JM Pearson Limited | Hospitality | 2026 |
| JMB Groundworks and Construction Ltd | Construction | 2023 |
| JMD Glass Limited | Construction | 2015 |
| JMF Aviation Support Limited | Manufacturing | 2019 |
| JMG 1965 Ltd | Professional & scientific | 2021 |
| JMH Prospect Limited | Professional & scientific | 2023 |
| JML Music Nation Limited | Information & communication | 2023 |
| Jmor Limited | Wholesale & retail | 2025 |
| Jmss Properties Ltd | Real estate | 2017 |
| JMT Highways Ltd | Construction | 2024 |
| JMT Training Limited | Education | 2020 |
| JNB Publishing Limited | Manufacturing | 2006 |
| JNS MOT Ltd | Wholesale & retail | 2026 |
| JO Booth Consultancy Ltd | Hospitality | 2025 |
| JO Steven Properties Limited | Real estate | 2012 |
| Joanne Flower Ltd | Health & social care | 2026 |
| Jobi Electrical Limited | Professional & scientific | 2018 |
| Jobsremote Limited | Information & communication | 2024 |
| Jobyco Direct Ltd | Wholesale & retail | 2015 |
| Jobyco Shipping Limited | Transport & logistics | 2004 |
| Jocathan Limited | Health & social care | 2022 |
| Jodamac Developments Ltd | Construction | 2022 |
| Jodecil Concepts Limited | Extraterritorial | 2024 |
| Jodha Scaffolding Ltd | Construction | 2025 |
| Jodhaconstruction Limited | Construction | 2023 |
| JOE Roll IT Music Limited | Arts & recreation | 2026 |
| Joelma Limited | Health & social care | 2014 |
| Joepereze Ltd | Construction | 2025 |