| JC Young Limited | Manufacturing | 2015 |
| Jc's Commercial Sprayers Limited | Wholesale & retail | 2008 |
| JCS Rentals Ltd | Real estate | 2025 |
| JDB Track Limited | Construction | 2021 |
| Jeaninespencer Limited | Health & social care | 2021 |
| Jenner Roofing Limited | Construction | 2025 |
| Jewels Medics Limited | Health & social care | 2026 |
| JG Services (Kent) Limited | Construction | 2019 |
| Jhsp Autos Ltd | Wholesale & retail | 2025 |
| JJ Building and Carpentry Service Ltd | Professional & scientific | 2019 |
| Jj's Utilities Ltd | Construction | 2019 |
| JJF Mortgages Ltd | Financial services | 2021 |
| JJS Cafe Limited | Hospitality | 2020 |
| JK Entertainment Ltd | Administrative & support | 2023 |
| JK Global Investment Limited | Financial services | 2026 |
| JK Utilities Limited | Construction | 2022 |
| JKC Contracts Ltd | Construction | 2021 |
| Jmch Music Ltd | Information & communication | 2023 |
| JMD Market Research Services Ltd | Professional & scientific | 2019 |
| JO Jo's Day Care Nursery Ltd. | Education | 2017 |
| Joel Oliver Ltd | Administrative & support | 2016 |
| John Frost Newspapers Limited | Other services | 2003 |
| John Prior (Home Improvements) Limited | Construction | 2006 |
| John W Bathurst Limited | Professional & scientific | 2010 |
| John.M.Riley Ltd | Construction | 2018 |
| Johnny Sandwich Limited | Hospitality | 2008 |
| JON LE Ltd | Hospitality | 2019 |
| Joseph Aquilina Services Limited | Health & social care | 2012 |
| Joy of YOU CIC | Other services | 2023 |
| JP Electrical (Kent) Limited | Construction | 2012 |
| JP Financial Planning Ltd | Financial services | 2025 |
| JR David Developments Ltd | Real estate | 2022 |
| JR Homestead Ltd | Real estate | 2023 |
| JRD Services Limited | Financial services | 2016 |
| JRJ Construction Ltd | Construction | 2021 |
| Jsjengineering Ltd | Professional & scientific | 2023 |
| Jtp-Signalling Ltd | Professional & scientific | 2022 |
| Jules Boyd Construction & Mining Limited | Construction | 2006 |
| Juliemay Clothing Ltd | Wholesale & retail | 2018 |
| Jumping Jellie Entertainment Ltd | Arts & recreation | 2018 |
| Jumping Monkey Bouncy Castle Hire Ltd. | Administrative & support | 2017 |
| Junicis Limited | Hospitality | 2015 |
| K & D'S Cleans Ltd | Administrative & support | 2025 |
| K & S Airport Services Limited | Transport & logistics | 2012 |
| K and a Rotisserie Ltd | Hospitality | 2025 |
| K G Construction and Building Services Ltd | Construction | 2016 |
| K J Baker Landscape Gardening Limited | Administrative & support | 2006 |
| K.I Studio Limited | Arts & recreation | 2025 |
| K2 Kitchens and Interiors Ltd | Wholesale & retail | 2015 |
| Kaby Automotive Ltd | Wholesale & retail | 2026 |
| Kaby Electrical Limited | Construction | 2014 |
| Kach Capital Estates Limited | Real estate | 2017 |
| Kach Capital Partners LLP | | 2009 |
| Kach Capital Services Limited | Professional & scientific | 2019 |
| Kaden Travel UK Ltd | Administrative & support | 2022 |
| Kafking Solutions Ltd | Professional & scientific | 2014 |
| Kalmar Project Management Limited | Construction | 2025 |
| Kashtech Hernebay Ltd | Wholesale & retail | 2019 |
| KBO Enterprise Limited | Real estate | 2019 |
| KC Telecommunications Limited | Information & communication | 2013 |
| Kebit Ltd | Construction | 2010 |
| Keeley Property Ltd | Hospitality | 2022 |
| Keiths Motors Ltd | Wholesale & retail | 2014 |
| Kelldown Limited | Construction | 1973 |
| Kent and Canterbury House Clearance Ltd | Transport & logistics | 2026 |
| Kent Caravan Repair Centre Ltd | Wholesale & retail | 2022 |
| Kent Climate Solutions Ltd | Energy | 2020 |
| Kent Coast Fire & Security Ltd | Construction | 2022 |
| Kent Coast Mansions Ltd | Households | 2025 |
| Kent Commercial Vehicle Maintenance Limited | Wholesale & retail | 2004 |
| Kent Connections (Herne Bay) Limited | Transport & logistics | 2005 |
| Kent Family Connections Ltd | Health & social care | 2024 |
| Kent Furnitureland Ltd | Wholesale & retail | 2025 |
| Kent House Care Home Limited | Health & social care | 2017 |
| Kent Insolvency Limited | Professional & scientific | 2023 |
| Kent Logs Limited | Agriculture & fishing | 2017 |
| Kent Premier Building Services Ltd | Construction | 2009 |
| Kent Therapy Matters Ltd | Health & social care | 2023 |
| Kent Tuning Limited | Wholesale & retail | 2020 |
| Kent Waterjet Cutting Limited | Administrative & support | 2004 |
| Kentfield Farm Ltd | Agriculture & fishing | 2025 |
| Kestival Limited | Extraterritorial | 2021 |
| Khushi PVT Ltd | Wholesale & retail | 2018 |
| Kiki Voltaire Limited | Manufacturing | 2008 |
| Kilbride Ltd | Real estate | 2023 |
| Kilburn Media Ltd | Financial services | 2024 |
| Kingsmead Properties Kent Limited | Hospitality | 2026 |
| Kirk Pattenden Limited | Construction | 2005 |
| Kirstyj Curtis Limited | Arts & recreation | 2023 |
| Kitsch Agency Limited | Professional & scientific | 2005 |
| Kiwi Resolutions Ltd | Administrative & support | 2018 |
| KJ Contracts Ltd | Construction | 2014 |
| KJ Ventures Ltd | Water & waste | 2026 |
| KJM Ecommerce Ltd | Wholesale & retail | 2023 |
| KKL Services Ltd | Manufacturing | 2005 |
| Klogw Solutions Ltd | Other services | 2015 |
| KM Convenience Store Ltd | Wholesale & retail | 2020 |
| Knapps Logistics Limited | Transport & logistics | 2006 |
| Koala Home Ltd | Wholesale & retail | 2020 |
| Kobold Projects Limited | Professional & scientific | 2013 |