| Iphelias Limited | Professional & scientific | 2009 |
| Irpo Ltd | Real estate | 2016 |
| Irricare Ltd | Administrative & support | 2018 |
| IVY & Whyte Garden Design Limited | Administrative & support | 2022 |
| J V Plumbing Engineers Ltd | Administrative & support | 2023 |
| J&P Concepts Limited | Other services | 2020 |
| J.C. White Geomatics Limited | Construction | 2003 |
| Jack Brophy Ltd | Professional & scientific | 2023 |
| Jake Russel David Homes Limited | Construction | 2024 |
| Janske Limited | Professional & scientific | 2013 |
| JAP 4X4 Motors Ltd | Wholesale & retail | 2025 |
| Javio Beheer IBC Limited | Other services | 2023 |
| Javio Beheer Limited | Other services | 2023 |
| Javio Onderhoud Limited | Other services | 2023 |
| JBL Developments Ltd | Construction | 2025 |
| JD Building Construction Services Ltd | Construction | 2025 |
| JD Rose Ltd | Arts & recreation | 2024 |
| Jell Architecture & Interiors Ltd | Professional & scientific | 2025 |
| JEM Flooring Ltd | Other services | 2016 |
| Jesson Close Management Company Limited | Administrative & support | 2001 |
| Jeuneville Limited | Professional & scientific | 2010 |
| JIM Moir Ltd | Construction | 2025 |
| JM Marketing Limited | Financial services | 2004 |
| Jmdr Logistics Limited | Other services | 2026 |
| JML Civil's Ltd | Construction | 2020 |
| JMM Group Holdings Limited | Financial services | 2020 |
| JMO Flooring Limited | Construction | 2001 |
| JMP Clinical Coding Consultancy Limited | Health & social care | 2014 |
| JMS Automation Limited | Manufacturing | 2023 |
| JN Catering Ltd. | Wholesale & retail | 2020 |
| John Michael Campbell Limited | Extraterritorial | 2022 |
| John Parker International Limited | Transport & logistics | 1989 |
| John Williams & Company (Contracting) Limited | Construction | 2003 |
| Johnson's Fruiterers Ltd | Administrative & support | 2017 |
| Johnstone Court Management Limited | Households | 2001 |
| JON Lewis Fencing Ltd | Construction | 2009 |
| Jones & Associates Ltd | Professional & scientific | 2005 |
| Joop Licht.Nl Limited | Extraterritorial | 2011 |
| Joseph Manton Limited | Wholesale & retail | 2021 |
| Josh Greencroft Consulting Ltd | Professional & scientific | 2013 |
| JSP Activity Ltd | Professional & scientific | 2019 |
| Jubilee College Limited | Education | 2008 |
| K & O Electrical Services Limited | Construction | 2017 |
| K W Motors (Kent) Ltd | Wholesale & retail | 2026 |
| KA Ellis Web Development Ltd | Information & communication | 2016 |
| Kai’S Foods Holdings Limited | Financial services | 2017 |
| Kali Shakti Holding Limited | Professional & scientific | 2019 |
| KARAPINAR68 Ltd | Hospitality | 2024 |
| Katiro Ltd | Manufacturing | 2021 |
| KC Global Business Consultancy Limited | Other services | 2024 |
| Keith Beavers Building Consultancy Limited | Construction | 2022 |
| Kent Balconies and Balustrades Limited | Manufacturing | 2018 |
| Kent Business Limited | Hospitality | 2018 |
| Kent Carpentry & Construction Ltd | Construction | 2017 |
| Kent Carpet Warehouse Ltd | Wholesale & retail | 2025 |
| Kent Project Consultancy Ltd | Professional & scientific | 2024 |
| Kent Same Day Couriers Ltd | Transport & logistics | 2026 |
| Kent Site Investigations Limited | Professional & scientific | 1989 |
| Kerlora Ltd | Wholesale & retail | 2025 |
| KGC Rail Services Limited | Construction | 2015 |
| KH Utilities Ltd | Construction | 2025 |
| Kindcompanion AI Ltd | Information & communication | 2025 |
| Kingdom Interiors Limited | Wholesale & retail | 2025 |
| Kings Accounting Limited | Professional & scientific | 2019 |
| Kingsnorth Consulting Limited | Professional & scientific | 2026 |
| KM Financial Consulting Limited | Professional & scientific | 2024 |
| KM International IBC Limited | Other services | 2024 |
| Knapman Properties Limited | Professional & scientific | 1993 |
| Kngr Commercial & Industrial Cleaning Ltd | Administrative & support | 2026 |
| Kofi Richards Limited | Professional & scientific | 2022 |
| Koparas Limited | Professional & scientific | 2013 |
| Kprail Construction & Consultancy Ltd | Construction | 2026 |
| Krekel Graaf- EN Grondwerkzaamheden Limited | Other services | 2026 |
| KT Hall Ltd | Real estate | 2021 |
| Kullasigns Ltd | Administrative & support | 2007 |
| Kunstgebit Totaal IBC Limited | Other services | 2024 |
| L & B Rail Executive Limited | Professional & scientific | 2015 |
| L&Sha Limited | Wholesale & retail | 2023 |
| Lafata Ltd | Hospitality | 2011 |
| Lambert Capital Ltd | Financial services | 2026 |
| Landrace Limited | Extraterritorial | 2021 |
| Lankdale Limited | Professional & scientific | 2009 |
| LAO Vieng Ltd | Hospitality | 2018 |
| Laomedeia Limited | Administrative & support | 2008 |
| Laser Transport International Limited | Transport & logistics | 1983 |
| Lask Properties Ltd | Real estate | 2026 |
| Laslett & Co Limited | Real estate | 2012 |
| Laslett Farms Limited | Agriculture & fishing | 2014 |
| Laslett International Limited | Professional & scientific | 2012 |
| Laslett Investments LLP | | 2022 |
| Lathan Ltd | Wholesale & retail | 2017 |
| Lavasse Limited | Other services | 2020 |
| Lazer Services Ltd | Manufacturing | 1999 |
| LB Electrical and Building Services Ltd | Construction | 2017 |
| LE Cloud Limited | Hospitality | 2021 |
| LE Cloud Liverpool Limited | Hospitality | 2026 |
| LE Cloud London Limited | Hospitality | 2026 |
| Leading-Edge Access & Inspection Ltd | Construction | 2019 |
| LEE Travel Consulting Ltd | Administrative & support | 2009 |
| Legend Signs Limited | Professional & scientific | 1988 |