| JCK Building & Carpentry Limited | Manufacturing | 2022 |
| JD Barot Properties Ltd | Real estate | 2026 |
| JD Electrical Limited | Construction | 2015 |
| JD Planning Limited | Real estate | 2023 |
| JD Rental Properties Ltd | Real estate | 2017 |
| JD Smart Services Ltd | Wholesale & retail | 2024 |
| Jd&Lm Ltd | Construction | 2024 |
| JDC Consultancy (Kent) Ltd | Construction | 2019 |
| JDC Financial Planning Limited | Financial services | 2020 |
| JDH Roofers Limited | Construction | 2023 |
| JDM Plumbing & Heating Ltd | Construction | 2022 |
| JDS Automation and Security Systems Ltd | Administrative & support | 2010 |
| JE Brandon Property Limited | Real estate | 2017 |
| JE Motor Ltd | Professional & scientific | 2018 |
| Jeema Company Limited | Health & social care | 2018 |
| JEM Lucy Media Limited | Professional & scientific | 2021 |
| Jemjosh Limited | Health & social care | 2019 |
| Jendochi Limited | Health & social care | 2015 |
| Jenrox Limited | Financial services | 2026 |
| Jenson Maritime Consultants (JMC) Limited | Transport & logistics | 2020 |
| Jersey Home Loans Limited | Financial services | 2002 |
| JESK26 Limited | Professional & scientific | 2026 |
| JET Invest Ltd | Financial services | 2021 |
| Jettex Ltd | Water & waste | 2024 |
| JEZ Poole Limited | Information & communication | 2013 |
| JF Health & Safety Consultants Limited | Professional & scientific | 2022 |
| JFF Consultants Ltd | Wholesale & retail | 2022 |
| JG Keen Ltd | Wholesale & retail | 2023 |
| JG Real Estate Ltd | Real estate | 2024 |
| JH Commercial Catering Services Ltd | Manufacturing | 2017 |
| Jhcb Management Ltd | Real estate | 2026 |
| JHS Burials Limited | Financial services | 2026 |
| Jidors OLU Limited | Construction | 2021 |
| Jila UK Property Ltd | Real estate | 2024 |
| Jimgos Kitchen Appliances Ltd. | Other services | 2011 |
| Jimpsy Ltd | Wholesale & retail | 2025 |
| JIT Homes Limited | Real estate | 2023 |
| JJ Carpentry Services (South East) Ltd | Construction | 2017 |
| JJ Nail & Spa (Kent) Ltd | Other services | 2023 |
| JJ Taxi Sittingbourne Limited | Transport & logistics | 2026 |
| Jj&So Recruitment Services Limited | Extraterritorial | 2023 |
| JJP Group Ltd | Construction | 2025 |
| JK Access Solutions Ltd | Construction | 2018 |
| JKB Electrical Services Limited | Construction | 2007 |
| JKD Prime Properties Ltd | Real estate | 2025 |
| JKS Contracting Ltd | Construction | 2021 |
| JLM Electrical Limited | Construction | 2025 |
| JLN Contractors Limited | Construction | 2020 |
| Jlsh Property Limited | Real estate | 2023 |
| Jmak Group Limited | Professional & scientific | 2012 |
| JMC Build Ltd | Construction | 2024 |
| JMC Civils Sussex Ltd | Construction | 2026 |
| JMC Hi-Tech Ltd | Manufacturing | 2016 |
| JMK Care Providers Limited | Health & social care | 2022 |
| JMO Care Limited | Health & social care | 2026 |
| JMO Quality Services Limited | Hospitality | 2016 |
| JMP Capital Limited | Real estate | 2019 |
| JMP Commerce Ltd | Wholesale & retail | 2020 |
| JMQ Limited | Professional & scientific | 2024 |
| JMR Recruitment Group Limited | Administrative & support | 2026 |
| JN Residential Limited | Real estate | 2022 |
| JNG Right Homes Ltd | Real estate | 2023 |
| JNJ Vault Ltd | Wholesale & retail | 2020 |
| JNM Football Group Ltd | Financial services | 2025 |
| JNP Technical Solutions Ltd | Other services | 2014 |
| JNP Transport Ltd | Transport & logistics | 2025 |
| Jo-Shan Care Services Ltd | Other services | 2024 |
| Joachim Consulting Ltd | Information & communication | 2011 |
| Joanna Brown Events Limited | Extraterritorial | 2016 |
| JOE Wharton Carpentry Ltd | Construction | 2017 |
| Joe's Investments Limited | Real estate | 2025 |
| Joes Rail Limited | Manufacturing | 2022 |
| Joey Knight Podcast Limited | Information & communication | 2024 |
| Jofak Ltd | Construction | 2016 |
| John Amarikwa Ltd | Wholesale & retail | 2022 |
| John Elect Limited | Professional & scientific | 2017 |
| John Field Limited | Other services | 1985 |
| John Fuller Farrier Limited | Other services | 2013 |
| John Harrison Construction Ltd | Construction | 2017 |
| John Morgan Studio Ltd | Professional & scientific | 2014 |
| John Neal Electrical Limited | Extraterritorial | 2010 |
| John Planck Limited | Wholesale & retail | 1990 |
| John S Stanton Ltd | Administrative & support | 2024 |
| John Surtees (Racing) Limited | Extraterritorial | 1960 |
| John Surtees Holdings Limited | Financial services | 2019 |
| John Surtees Limited | Construction | 1957 |
| Johnson’S Mots Ltd | Wholesale & retail | 2021 |
| JOI Investment Properties Ltd | Real estate | 2026 |
| Jolad Care Services Ltd | Health & social care | 2021 |
| Jolanfaceclinic Limited | Other services | 2020 |
| Jomola Care Ltd | Health & social care | 2019 |
| Jone's Hauliers Limited | Transport & logistics | 2018 |
| Jones & BRO DRY Lining Ltd | Construction | 2016 |
| Jones Auto Services Limited | Wholesale & retail | 2013 |
| Jordan Engineering Ltd | Professional & scientific | 2025 |
| Jordan Lifting Operations Ltd | Construction | 2025 |
| Jordan Miles Limited | Construction | 2023 |
| Jordan Transport Ltd | Transport & logistics | 2019 |
| Jordie Adjornie Smith Limited | Construction | 2025 |
| Joris Services Limited | Construction | 2025 |