| JNR Consulting Limited | Administrative & support | 2012 |
| JO and the Pear Tree Ltd | Hospitality | 2018 |
| JO Building Services Ltd | Construction | 2020 |
| JO Francis Ltd | Professional & scientific | 2022 |
| Joanna Holidays Limited | Administrative & support | 2017 |
| Joanne Ltd | Real estate | 2023 |
| Joemango Healthcare Ltd | Health & social care | 2025 |
| Jofat Ltd | Real estate | 2024 |
| John Charles Plank Ltd | Construction | 2014 |
| John George Property Solutions Ltd | Construction | 2018 |
| John Hector Limited | Other services | 2016 |
| John Kirkham Consulting Limited | Professional & scientific | 2008 |
| John Lingham Mortgage and Protection Services Ltd | Financial services | 2018 |
| Johnson & Johnson Enterprises Ltd | Other services | 2011 |
| Johnson Garden Day Nursery Limited | Education | 2007 |
| Johnson Property Partners Limited | Real estate | 2025 |
| Johnson Williams Mortgages Ltd | Financial services | 2026 |
| Johnsons Project Management Services Limited | Construction | 2014 |
| Joint Venture Development Projects Ltd | Real estate | 2017 |
| Jokes With Mark Limited | Arts & recreation | 2025 |
| Jollysprings Technologies Ltd | Construction | 2026 |
| Jomilised Ltd | Health & social care | 2018 |
| JON Budd Ltd | Administrative & support | 2003 |
| JON Mitchell Consulting Limited | Professional & scientific | 2010 |
| JON Redding Limited | Professional & scientific | 2017 |
| Jones Building Contractors Limited | Construction | 2002 |
| Jones Scaffolding Solutions Ltd | Construction | 2025 |
| Jones Taylor Steven Limited | Financial services | 1994 |
| Jonny Owen Limited | Administrative & support | 2011 |
| Jonty’S Little Feasts Ltd | Hospitality | 2024 |
| Joocify Ltd | Manufacturing | 2020 |
| Joos Trans Ltd | Transport & logistics | 2020 |
| Jordan & Bateman Architects Limited | Professional & scientific | 2003 |
| Jordan Property Investments Limited | Real estate | 2022 |
| Joseph House (Reginald Square) RTM Company Limited | Households | 2018 |
| Joseph Sutton Motor Company Limited | Wholesale & retail | 2016 |
| Joubert Guindel Properties Ltd | Real estate | 2024 |
| Joubert Solutions Limited | Information & communication | 2016 |
| Joy Oliver Ltd | Real estate | 2025 |
| Joyfully Agile Ltd | Information & communication | 2020 |
| Joysirius Limited | Wholesale & retail | 2025 |
| Joysky Limited | Health & social care | 2021 |
| JP Aromas Ltd | Manufacturing | 2020 |
| JP Endersby Limited | Information & communication | 2015 |
| JP Health Group Ltd | Health & social care | 2026 |
| JP3 Broking Ltd. | Financial services | 2009 |
| JP4MANCE Tuning Parts Limited | Wholesale & retail | 2013 |
| JPC Maidstone Electrical Ltd | Construction | 2011 |
| Jphakin Ltd | Construction | 2023 |
| JPO Utilities Limited | Construction | 2023 |
| JPS CT Consultancy Limited | Professional & scientific | 2021 |
| JPS Software Solutions Ltd | Information & communication | 2024 |
| Jpsparkdrive Ltd | Construction | 2024 |
| JPT Direct Ltd | Information & communication | 2010 |
| JPW Services Ltd | Construction | 2016 |
| JR Garden Maintenance Ltd | Administrative & support | 2018 |
| JR Investments Limited | Real estate | 1993 |
| JR Security Fencing Limited | Administrative & support | 2023 |
| JRB Carpentry & Building Ltd | Construction | 2019 |
| JRB Fabrications Limited | Manufacturing | 2005 |
| JRB Plumbing Ltd | Construction | 2018 |
| JRB Roofing Limited | Construction | 2004 |
| JRC Property Ltd | Real estate | 2016 |
| JRT Management Solutions Limited | Other services | 2018 |
| JRV Building and Carpentry Limited | Construction | 2013 |
| JS Audio Visual Limited | Construction | 2016 |
| JS Innovative Solutions Ltd | Information & communication | 2016 |
| JS Klos Ltd | Manufacturing | 2020 |
| JS Oak Limited | Real estate | 2022 |
| JS Properties (Maidstone) Ltd | Real estate | 2017 |
| JS Security Solutions Limited | Construction | 2021 |
| JSB Companies Limited | Financial services | 2014 |
| JSH Digital Solutions Ltd | Information & communication | 2019 |
| JSP Drilling Limited | Construction | 2025 |
| JSR MS Ltd | Administrative & support | 2025 |
| Jsrj Autos Ltd | Wholesale & retail | 2018 |
| JSW Oncology Services Limited | Health & social care | 2021 |
| JT Corporation Ltd | Health & social care | 2023 |
| JT Property Management Limited | Real estate | 2022 |
| JTF Roofing Ltd | Construction | 2022 |
| Jtrm Property Limited | Real estate | 2026 |
| Ju&Mi Ltd | Hospitality | 2026 |
| Jubilee Enterprise Foundation | Professional & scientific | 2012 |
| Jubilee Healthcare Estate Ltd | Real estate | 2026 |
| Jubilee Healthcare Services Ltd | Health & social care | 2026 |
| Jubilee Home Services Ltd | Other services | 2019 |
| Jubilee Primary School | Education | 2012 |
| Jubilee Publishing Ltd | Information & communication | 2007 |
| Jubilee Resource Hub | Real estate | 2006 |
| Judd. Architecture Ltd | Professional & scientific | 2005 |
| Judi Castille Ltd | Manufacturing | 2012 |
| Juice Motors Limited | Wholesale & retail | 2018 |
| Julesinspires Ltd | Health & social care | 2025 |
| Juliet Rose Investment Distribution Ltd | Financial services | 2017 |
| Jump in Kent Ltd | Administrative & support | 2012 |
| Jumpin Rocks Limited | Arts & recreation | 2021 |
| Jungledragon Ltd | Wholesale & retail | 2023 |
| Juni Digital Ltd | Information & communication | 2012 |
| Juniper Limited | Agriculture & fishing | 1988 |
| Juniper Tax Services Limited | Professional & scientific | 2025 |