| Johnny Atom Productions Limited | Professional & scientific | 2007 |
| Johnson Mechanical & Aircon Services Limited | Other services | 2011 |
| Jomisu Limited | Financial services | 2020 |
| Joncha Limited | Financial services | 2010 |
| Jones Lighting Solutions Ltd | Wholesale & retail | 2024 |
| Jones Retail Ltd | Real estate | 2009 |
| Jonny's Drains Ltd | Administrative & support | 2011 |
| Jose & Sebastian Ltd | Health & social care | 2011 |
| Journié Lifestyle Group Ltd | Wholesale & retail | 2026 |
| Joyful Consulting Limited | Information & communication | 1997 |
| Joyful Yoga and Movement Ltd | Manufacturing | 2025 |
| Joyner & Mason Limited | Construction | 2010 |
| JP Advisors Ltd | Professional & scientific | 2023 |
| JP Air Conditioning Services Holdings Ltd | Financial services | 2025 |
| JP Specialised Limited | Manufacturing | 2025 |
| JP Specialised Services Limited | Manufacturing | 2014 |
| JPF Analytics Ltd | Transport & logistics | 2020 |
| Jpfm Limited | Construction | 2020 |
| Jpfm Properties Ltd | Real estate | 2025 |
| JPK Access Services Limited | Construction | 2019 |
| Jpla Investments Ltd | Households | 2020 |
| JR Dental Practice Ltd | Health & social care | 2026 |
| JR Financial (Accounting and Business Services) Limited | Professional & scientific | 2020 |
| JR Financial (Consulting) Limited | Professional & scientific | 2024 |
| JR Wilson Tree Specialist Limited | Agriculture & fishing | 2010 |
| Jrad Holdings Limited | Financial services | 2019 |
| JRT Plastering Limited | Construction | 2026 |
| JSA Plumbing & Heating Services Limited | Construction | 2010 |
| JSS (North Downs) Limited | Real estate | 2012 |
| Jtplandscapes Ltd | Administrative & support | 2022 |
| JTS Chaps Limited | Construction | 2003 |
| Jubileum Limited | Real estate | 2021 |
| Judah's Properties Limited | Real estate | 2021 |
| Judd House Freehold Limited | Households | 2018 |
| Juice TV Ltd | Information & communication | 2021 |
| Jules Boutique Ltd | Wholesale & retail | 2018 |
| Julia Investments Limited | Real estate | 2024 |
| Julia Kamel Limited | Wholesale & retail | 2026 |
| Julie and Rudy LLP | | 2025 |
| Juliet Bainise Limited | Information & communication | 2010 |
| Jumping Jacks Bouncy Castles Ltd | Arts & recreation | 2021 |
| Juris Labs Ltd | Information & communication | 2026 |
| Just a Break Ltd | Hospitality | 2024 |
| Just ADD Milk Theatre Company Ltd | Arts & recreation | 2018 |
| Just Cables Electrical Limited | Construction | 2007 |
| Just Heroics Limited | Administrative & support | 2010 |
| Just Homly Limited | Wholesale & retail | 2026 |
| JVR Property Development Ltd | Real estate | 2024 |
| JVR Renovation Ltd | Construction | 2019 |
| JW Law (Kent) Limited | Professional & scientific | 2023 |
| JWA Build Resources Ltd | Construction | 2025 |
| JY Marketing Consultancy Ltd | Other services | 2014 |
| K and M Developers Ltd | Construction | 2018 |
| K C Davies Limited | Administrative & support | 2003 |
| K E Group Limited | Professional & scientific | 1992 |
| K P Martin Fabrications Limited | Extraterritorial | 2002 |
| K Uppal Ltd | Professional & scientific | 2022 |
| K.E. AML Services Limited | Administrative & support | 2012 |
| K.M. (Refrigeration Electrical) Services Limited | Other services | 1976 |
| K3R Ltd | Real estate | 2020 |
| KA Shoreham Ltd | Hospitality | 2025 |
| Kaangu Ltd | Construction | 2019 |
| Kaber Investments Limited | Professional & scientific | 2018 |
| Kacoh Limited | Real estate | 2011 |
| Kaiser Property Ltd | Real estate | 2022 |
| Kaives Limited | Financial services | 2025 |
| Kake & Kocktail Ltd | Hospitality | 2022 |
| Kaleidoscope Leadership Consultancy Ltd | Professional & scientific | 2023 |
| Kalen Padbury Closing Ltd | Education | 2026 |
| Kanna Health Ltd | Professional & scientific | 2021 |
| Kanta Catering Ltd | Hospitality | 2018 |
| Kanuhura Property Limited | Real estate | 2016 |
| Kap-D Co Ltd | Wholesale & retail | 2019 |
| Karimi Rugs Ltd | Wholesale & retail | 2018 |
| Karipap Ltd | Real estate | 2020 |
| Karl's Country Kitchen Limited | Hospitality | 2014 |
| Karringtons Limited | Construction | 2015 |
| Karrison Commercial Ltd | Real estate | 2008 |
| Kassandra Investments Limited | Real estate | 2020 |
| Kata Holdings Limited | Real estate | 2026 |
| Kata Jewellery Ltd | Manufacturing | 2018 |
| Kate Hersey Estates Limited | Real estate | 2024 |
| Kate Willis Ltd | Health & social care | 2026 |
| Katherine Rose Hall Ltd | Information & communication | 2024 |
| Kaystamp Limited | Manufacturing | 2008 |
| KAZ Productions Ltd | Hospitality | 2021 |
| Kazoku Restaurant Group Ltd | Hospitality | 2019 |
| KB Insight and Strategy Ltd | Professional & scientific | 2020 |
| KB Platinum Motors Limited | Wholesale & retail | 2023 |
| KBP Financial Limited | Administrative & support | 2003 |
| KC Foods Ltd | Hospitality | 2025 |
| KC Management (South East) Ltd | Construction | 2009 |
| KCF Ltd | Construction | 2018 |
| KCJ Medical Ltd | Wholesale & retail | 2026 |
| KE Americas Limited | Professional & scientific | 2014 |
| Keane Equestrian Ltd | Agriculture & fishing | 2026 |
| Keatmay Limited | Manufacturing | 1978 |
| Keava Investments Limited | Real estate | 1981 |
| Keep Phytt (West Kent) CIC | Education | 2023 |
| Keller Court Management Company Limited | Households | 2009 |