| Lemko Limited | Other services | 2025 |
| Leopard Print Limited | Manufacturing | 1998 |
| Light UP the Night Limited | Administrative & support | 2024 |
| Lily Freehold Limited | Real estate | 2025 |
| Lilyrose Ltd | Education | 2022 |
| Little Explorers Eastry Ltd | Education | 2024 |
| Little Explorers Hythe Ltd | Education | 2016 |
| LJ Car Wash Limited | Administrative & support | 2026 |
| Lkeinfrastructure Ltd | Construction | 2026 |
| Loaganside Limited | Professional & scientific | 2009 |
| Lodgegreen Developments Limited | Real estate | 1998 |
| Logistic Port Service Beheer Limited | Other services | 2025 |
| Logistic Port Service Limited | Other services | 2025 |
| London Grey Ltd | Professional & scientific | 2014 |
| Longhurst Refrigeration Contract Maintenance Ltd | Manufacturing | 2017 |
| Longhurst Refrigeration Ltd | Manufacturing | 2014 |
| Lookers Lane Residents Company Limited | Households | 2018 |
| Lorna Morris Creative Ltd | Information & communication | 2018 |
| Louise Roots Wedding & Event Florist Ltd | Wholesale & retail | 2021 |
| Loyalty Windows Limited | Construction | 2008 |
| LS Building & Maintenance (Kent) Ltd | Construction | 2017 |
| Luc's Handelsmaatschappij Beheer Limited | Other services | 2025 |
| Luc's Handelsmaatschappij Limited | Other services | 2025 |
| Lukin House Management Limited | Households | 1999 |
| Luna and the Stars Ltd | Wholesale & retail | 2020 |
| LUX Capital Advisors IBC Limited | Other services | 2020 |
| LUX Capital Corporation Limited | Professional & scientific | 2016 |
| LUX Global Investment Corporation Limited | Other services | 2020 |
| LW Construction and Engineering Limited | Construction | 2021 |
| LX Foundry Ltd | Information & communication | 2026 |
| Lympne Castle Management Limited | Administrative & support | 2023 |
| Lympne Castle Property Limited | Administrative & support | 2023 |
| Lympne Country Stores Ltd | Wholesale & retail | 2024 |
| LZM Solutions Limited | Wholesale & retail | 2025 |
| Macmobility Consulting Ltd | Professional & scientific | 2024 |
| Maesktrans Global Trade Beheer Limited | Other services | 2024 |
| Maesktrans Global Trade Limited | Other services | 2024 |
| Majatrading Limited | Professional & scientific | 2013 |
| Make Consultancy Limited | Professional & scientific | 2018 |
| Make International IBC Limited | Professional & scientific | 2018 |
| Maldives Whale Shark Research Programme Ltd | Professional & scientific | 2008 |
| Maldives Whale Shark Research Programme Trading Ltd | Administrative & support | 2010 |
| Malthouse Hill Management Limited | Households | 2003 |
| Management Company Maja Limited | Other services | 2021 |
| Mancilla Rail Limited | Construction | 2015 |
| Manicgrin Media Limited | Information & communication | 2012 |
| Maple Villas Limited | Real estate | 2014 |
| Marchica Beheer Limited | Other services | 2025 |
| Marchica Limited | Other services | 2025 |
| Mariën Zathe Limited | Other services | 2024 |
| Martello Heating & Plumbing Installations Ltd | Construction | 2023 |
| Martello Philatelic Auctions Limited | Wholesale & retail | 2013 |
| Martin Roberts Family Partnership LLP | | 2019 |
| Martin's & Co Supreme Landscaping & Fencing Ltd | Administrative & support | 2022 |
| MAS Industries Ltd | Administrative & support | 2025 |
| Masters in Construction Europe Limited | Other services | 2026 |
| Maxson Beheer Limited | Other services | 2026 |
| Mchardy Training Limited | Education | 2016 |
| Meadowbrook Court (Sandgate) Limited | Real estate | 1998 |
| Medico Estate Beheer IBC Limited | Professional & scientific | 2018 |
| Medway Airsports Limited | Transport & logistics | 2025 |
| Medway Early Years Limited | Education | 2017 |
| Meet Greet Go Limited | Transport & logistics | 2016 |
| Mejr Holdings Limited | Financial services | 2024 |
| Meliora Madiz Associates Limited | Financial services | 2022 |
| Meridian Micro Limited | Wholesale & retail | 2001 |
| Merlan Seafood Beheer IBC Limited | Other services | 2024 |
| Merrit 1959 Limited | Extraterritorial | 2013 |
| Metro Traffic Holdings Limited | Financial services | 2025 |
| Metro Traffic Services Ltd | Transport & logistics | 2012 |
| MF Patrimonium Limited | Other services | 2026 |
| MF Rewilding Ltd | Real estate | 2022 |
| MGP Graphic Service Holding Limited | Other services | 2025 |
| MGP Graphic Service Limited | Other services | 2025 |
| Millenbeech Limited | Administrative & support | 1989 |
| Millennium Business Technology Limited | Information & communication | 1995 |
| Millennium Holdings Ltd | Financial services | 2025 |
| Mino Horeca Support Limited | Other services | 2023 |
| MIT Milch Coffee Ltd | Wholesale & retail | 2021 |
| MJD Building & Decorating Kent Limited | Construction | 2025 |
| MJS Design and Build Ltd | Administrative & support | 2017 |
| MLD Civils and Utilities Limited | Construction | 2025 |
| MO81 Limited | Other services | 2025 |
| Modo Market Ltd | Wholesale & retail | 2025 |
| MOMO81 Limited | Other services | 2025 |
| Moran Court Residents Association Limited | Households | 1989 |
| Morgan Glover Limited | Administrative & support | 2005 |
| Mortley Group Holdings Ltd | Administrative & support | 2021 |
| Mortley Ltd | Administrative & support | 2026 |
| Morton Brown Limited | Construction | 2005 |
| Motta Creative Ltd | Arts & recreation | 2023 |
| Motta Digital Ltd | Information & communication | 2023 |
| Mount House (Folkestone) Limited | Real estate | 1994 |
| Movarix Limited | Other services | 2026 |
| Moyle Court Management Limited | Households | 1987 |
| MPS Trading World Limited | Other services | 2025 |
| MR. Mistoffelees Limited | Professional & scientific | 2016 |
| MSL Mechanical Services Limited | Construction | 2012 |
| MTS Consultancy (Kent) Ltd | Transport & logistics | 2020 |
| Mvent Group Europe Limited | Other services | 2024 |