| Kent Leisure and Hospitality Ltd | Hospitality | 2023 |
| Kent Plastering Contractors Limited | Construction | 2006 |
| Kent Pump Company Ltd | Administrative & support | 2020 |
| Kent Renewables Ltd | Construction | 2021 |
| Kent WOW Cuisine Ltd | Hospitality | 2023 |
| KER & Downey Africa Limited | Administrative & support | 2011 |
| Kerry Dean Studio Ltd | Professional & scientific | 2015 |
| Keyside Consultants Limited | Construction | 2024 |
| Kiemia Ltd | Professional & scientific | 2020 |
| KJB Global IT Solutions Limited | Information & communication | 2008 |
| Knight Medicolegal Limited | Health & social care | 2019 |
| Knockwood Construction Limited | Construction | 2018 |
| Kokusai Expediters Ltd | Administrative & support | 2007 |
| Korkers Distribution Limited | Wholesale & retail | 2012 |
| Kougar Cars Limited | Manufacturing | 1999 |
| KPC Developments Ltd | Construction | 2020 |
| KPC Group Ltd | Construction | 2022 |
| KPC Maintenance Limited | Construction | 2017 |
| KPC Renovations Ltd | Construction | 2020 |
| KR Motorsport Ltd | Wholesale & retail | 2024 |
| KRT Accountancy Services Ltd | Professional & scientific | 2013 |
| Kuunganisha Ministries Ltd | Other services | 2023 |
| KWI Group Ltd | Information & communication | 2011 |
| Laidlaw's Auto Service Limited | Wholesale & retail | 2003 |
| Lane Developments Limited | Real estate | 1955 |
| Larchimage Holdings Limited | Professional & scientific | 2005 |
| Latter-Dc Kent Limited | Construction | 2022 |
| Latter-Dc Limited | Construction | 2012 |
| Leadingedgetv Limited | Information & communication | 2013 |
| Learra Press Ltd | Information & communication | 2026 |
| Legal Legs Ltd | Professional & scientific | 2019 |
| Leglicious Ltd | Wholesale & retail | 2018 |
| Leornian Limited | Administrative & support | 2013 |
| LGD Design Limited | Professional & scientific | 2024 |
| Life Changing Properties Limited | Real estate | 2017 |
| Light IT UP UK Ltd | Administrative & support | 2018 |
| Linchpin Events Support Limited | Other services | 2021 |
| Lineglobal Limited | Manufacturing | 1990 |
| Linksproperty Ltd | Real estate | 2025 |
| Little Barton Freehold Limited | Households | 2021 |
| Little Bear Luxe Ltd | Wholesale & retail | 2025 |
| Little Pickles Nursery Tenterden Ltd | Education | 2016 |
| Little Sheiling Services Limited | Wholesale & retail | 2018 |
| LJC Landscapes Ltd | Administrative & support | 2015 |
| London & Kent Cooling Ltd | Energy | 2019 |
| London Beach Leisure Limited | Arts & recreation | 2005 |
| Lonely Peacock Ltd | Real estate | 2025 |
| Lower Lake Property Limited | Real estate | 1997 |
| Lowrie Brothers Limited | Construction | 2002 |
| Luna Nova Associates Limited | Information & communication | 2012 |
| Lunar CAP Limited | Professional & scientific | 2026 |
| Lunar Works LAB Limited | Information & communication | 2017 |
| Lyddair Limited | Transport & logistics | 2001 |
| M G I Contracts Limited | Administrative & support | 2008 |
| M Harrington Tree Surgery Ltd | Administrative & support | 2026 |
| M Yastrebova Limited | Health & social care | 2025 |
| M&T 1903 Ltd | Real estate | 2022 |
| M.A.M Products Limited | Wholesale & retail | 2023 |
| Maidstone Land Company Limited(The) | Real estate | 1934 |
| Makin Fencing Limited | Administrative & support | 2008 |
| Malcolm Jarvis Homes Limited | Construction | 2002 |
| Mamz Accounting & Advisory Limited | Professional & scientific | 2024 |
| Manifold Editions London Limited | Wholesale & retail | 2011 |
| Manktelow Roofing Limited | Construction | 2005 |
| Maoloud Investment Ltd | Real estate | 2025 |
| MAP Taxis Ltd | Transport & logistics | 2025 |
| Marchants of Bethersden Limited | Administrative & support | 2011 |
| Maringo Ltd | Professional & scientific | 2011 |
| Maristani Limited | Manufacturing | 2016 |
| Maristani London Limited | Manufacturing | 2016 |
| Marnex Contractors Limited | Construction | 2003 |
| Marnie South East Ltd | Real estate | 2023 |
| Marsh & Sons Construction and Restoration Ltd | Construction | 2021 |
| Marsh & Sons Construction Ltd | Construction | 2023 |
| Marsh Enterprises Ltd | Arts & recreation | 2020 |
| Mccanns Brewery Limited | Manufacturing | 2022 |
| Mehmet and Helen Limited | Other services | 2026 |
| Mereview (Holdings) Limited | Financial services | 2006 |
| Mereview Limited | Construction | 1974 |
| Merit Thornton Planning & Community Consultants Limited | Professional & scientific | 2011 |
| Messy Play Jamboree Limited | Health & social care | 2024 |
| Metcalf Property Limited | Real estate | 2017 |
| Metis Training Ltd | Administrative & support | 2025 |
| Mews (Tenterden) Management Company Limited(The) | Households | 1981 |
| Michael Wright Associates Limited | Financial services | 2014 |
| MID Kent Windows Limited | Manufacturing | 1989 |
| Miles Garage Limited | Wholesale & retail | 1959 |
| Millard Designs Ltd | Wholesale & retail | 2018 |
| Millisford Limited | Real estate | 1975 |
| Milo Projects Kent Limited | Administrative & support | 2018 |
| Mind Management Limited | Health & social care | 1988 |
| Mindful Business Services Limited | Professional & scientific | 2013 |
| Mint Fresh Services Ltd | Administrative & support | 2019 |
| MJB Contracting Services Ltd | Construction | 2024 |
| MM Financial Management Limited | Financial services | 1993 |
| MM Office Services Limited | Information & communication | 2000 |
| Mobile Inc Ltd | Wholesale & retail | 2024 |
| Mockford Alley Management Limited | Households | 2020 |
| Mole Consultancy (SE) Limited | Professional & scientific | 2025 |
| Montalbano Group Limited | Financial services | 2018 |