| JRP Property Division Limited | Real estate | 2017 |
| JSB Renovations Ltd | Construction | 2024 |
| Jsrdr Limited | Other services | 2020 |
| JSW Property Developments Ltd | Professional & scientific | 2024 |
| JT Wind Ltd | Construction | 2021 |
| Jtwasteclearance Ltd | Water & waste | 2026 |
| Judd's Folly Estates Limited | Real estate | 2019 |
| Judd's Folly Hotel Limited | Hospitality | 2011 |
| Jude Horticulture Ltd | Administrative & support | 2021 |
| Junction Road Eastbourne Limited | Financial services | 2024 |
| Justin Croft Antiquarian Books Limited | Wholesale & retail | 2008 |
| JWY Limited | Information & communication | 2015 |
| K & P Developments Limited | Extraterritorial | 2011 |
| K Investment Properties Ltd | Construction | 2018 |
| K J Smith Transport Limited | Transport & logistics | 2011 |
| Kaeh Medical Consultancy Ltd | Health & social care | 2025 |
| Kalace Group Ltd | Wholesale & retail | 2026 |
| Kalkan Secrets Limited | Administrative & support | 2013 |
| Kalm Property Development Limited | Construction | 2023 |
| KAY Aitch (Tunbridge Wells) Limited | Real estate | 1944 |
| KAYO20 Ltd | Transport & logistics | 2023 |
| KBR Construction Ltd | Construction | 2025 |
| Kemsley Building & Roofing Limited | Construction | 2017 |
| Kent & Medway Biological Records Centre | Arts & recreation | 2003 |
| Kent Awards Ltd | Wholesale & retail | 2024 |
| Kent Changeover Services Ltd | Administrative & support | 2024 |
| Kent Clinical Ultrasound Limited | Health & social care | 2024 |
| Kent Coastal Developments Ltd | Construction | 2022 |
| Kent Community Training C.I.C. | Hospitality | 2016 |
| Kent Greyhound Derby Limited | Arts & recreation | 1999 |
| Kent Landscape Projects Ltd | Professional & scientific | 2024 |
| Kent Leisure Services Ltd | Wholesale & retail | 2025 |
| Kent Loft Company Limited | Construction | 2008 |
| Kent Maker Limited | Wholesale & retail | 2018 |
| Kent Mobile Aesthetics Ltd | Other services | 2024 |
| Kent Motoring Centre Ltd | Wholesale & retail | 2017 |
| Kent Productions UK Limited | Professional & scientific | 1999 |
| Kent Pubs Ltd | Hospitality | 2024 |
| Kent Refurb Limited | Construction | 2008 |
| Kent Scaffold Labour and Hire Ltd | Construction | 2022 |
| Kent School of Veterinary Nursing Limited | Education | 2018 |
| Kent Water Services Ltd | Construction | 2018 |
| Kenteducationalpsychology Limited | Education | 2024 |
| Kentexe Ltd | Construction | 2017 |
| Kevin JAY Limited | Professional & scientific | 2020 |
| Keviskillz Ltd | Information & communication | 2022 |
| Key Freight Ltd | Transport & logistics | 2014 |
| Keyforce Limited | Manufacturing | 2003 |
| KHI Edits Limited | Information & communication | 2015 |
| Kilbride Medical Associates Ltd | Health & social care | 2008 |
| Killick Roofing Ltd | Construction | 2023 |
| Kingfisher Mews Management Company Limited | Households | 2008 |
| Kingsman Thermal Insulation Limited | Construction | 1996 |
| Kinshipped Ltd | Manufacturing | 2018 |
| Kintsugi Healthcare & Leadership Consulting Ltd | Professional & scientific | 2025 |
| Kirby's Garden Management Company Limited | Households | 1995 |
| Kitchen Five Limited | Hospitality | 2024 |
| KJM Consulting (Kent) Ltd | Professional & scientific | 2024 |
| KLM Construction Group Limited | Construction | 2021 |
| KMK India Ltd | Hospitality | 2020 |
| Kmldmedia - Kent Marketing Leaflet Distribution Media Ltd | Other services | 2023 |
| Knocks Recovery and Transportation Limited | Wholesale & retail | 2024 |
| Knotane Limited | Information & communication | 2016 |
| Knots and Weave Flooring Solutions Ltd | Construction | 2025 |
| Koala Rentals Ltd | Real estate | 2023 |
| Kokani Limited | Real estate | 2025 |
| Koru Management (UK) Limited | Financial services | 2025 |
| Kosani Logistic Ltd | Transport & logistics | 2024 |
| Kprents Ltd | Real estate | 2023 |
| KPS Joinery & Carpentry Limited | Construction | 2009 |
| KQ Properties Ltd | Real estate | 2025 |
| Krakin Networks Limited | Administrative & support | 2026 |
| Kupo Ltd | Hospitality | 2017 |
| Kushanda Virtual Assistance and Recruitment Agency Ltd | Administrative & support | 2026 |
| L & K Services Ltd | Professional & scientific | 2019 |
| L & P Probate Limited | Extraterritorial | 2014 |
| L R Baker Electrical Ltd | Construction | 2014 |
| L&S Renovations Ltd | Construction | 2025 |
| L.J. Smith Building Services Limited | Construction | 2025 |
| LA MER Holdings Limited | Financial services | 2020 |
| LA MER Limited | Wholesale & retail | 1982 |
| LA Salle Property Company Limited | Construction | 2001 |
| Laidback Longboards Ltd | Manufacturing | 2014 |
| Lakshmila Ltd | Professional & scientific | 2021 |
| Land and Property Probate Limited | Extraterritorial | 2014 |
| Landscape Brand Ltd | Wholesale & retail | 2023 |
| Langfit Ltd | Construction | 2014 |
| Langham Kitchens Ltd | Construction | 2021 |
| Langston Holdings Ltd | Financial services | 2023 |
| Langston Shopfitters Limited | Construction | 2002 |
| Lark Basements Ltd | Construction | 2023 |
| Lawtonash Training Services Ltd | Education | 2011 |
| Lawtonash Utility Equipment Hire Ltd | Administrative & support | 2018 |
| Layback Sound Ltd | Information & communication | 2023 |
| Leading Ltd | Construction | 2021 |
| Lees Court Crops Ltd | Agriculture & fishing | 2021 |
| Lees Court Farms Ltd | Agriculture & fishing | 2023 |
| Lees Court Ltd | Extraterritorial | 2021 |
| Legacy Green Energy Limited | Energy | 2021 |
| Lemon Labels Ltd | Administrative & support | 2010 |