| Longer House Properties Limited | Real estate | 2021 |
| Longhill Developments Limited | Construction | 2022 |
| Longlanefarmhouse Limited | Information & communication | 2023 |
| Lonsdale Court Ltd | Real estate | 2013 |
| Lord Henley Consulting Limited | Administrative & support | 2017 |
| Louis ING & Co Ltd | Real estate | 2022 |
| LR Health & Beauty Systems Ltd | Extraterritorial | 2012 |
| LR Plumbing and Heating Services Limited | Construction | 2026 |
| LRX2 Ltd | Real estate | 2025 |
| LTM Law Limited | Professional & scientific | 2024 |
| Luck-Now Developments Limited | Construction | 2012 |
| Lucky Source Ltd | Wholesale & retail | 2024 |
| Luckyfield Limited | Extraterritorial | 1985 |
| Lumapath Compliance Ltd | Professional & scientific | 2026 |
| Luno Limited | Information & communication | 2012 |
| Lush Nails Dover Ltd | Other services | 2023 |
| LUX Consultance & Services Invest PLC | Extraterritorial | 2013 |
| LUX Consultance & Services UK Ltd | Professional & scientific | 2023 |
| LUX XO Ltd | Extraterritorial | 2019 |
| Luxe Studios Collective Ltd | Other services | 2025 |
| Luxeeride Ltd | Transport & logistics | 2025 |
| Luxury Bathware Ltd | Wholesale & retail | 2024 |
| Luxury Garden Treasures Limited | Wholesale & retail | 2024 |
| Luxury Hospitality Cruise Training Limited | Education | 2022 |
| Luxury Menuiserie Invest Ltd | Extraterritorial | 2023 |
| Luxury Menuiserie Ltd | Extraterritorial | 2023 |
| Luxury Yacht Interior Training Limited | Education | 2022 |
| Lwlama Limited | Professional & scientific | 2002 |
| Lydia Noble Limited | Other services | 2024 |
| Lynch Family Holdings Ltd | Real estate | 2017 |
| Lynwood Green Management Company Limited | Households | 2020 |
| M & B (Felixstowe) Limited | Transport & logistics | 1998 |
| M & P Marine Services Ltd | Manufacturing | 2017 |
| M Cubed Carpentry and Construction Limited | Construction | 2024 |
| M Specialist Ltd | Wholesale & retail | 2021 |
| M&B (Chilled Distribution) Ltd | Transport & logistics | 2022 |
| M&B (Logistics) Ltd | Transport & logistics | 2012 |
| M&B Roofing Specialist Ltd | Construction | 2025 |
| M&S Trading Dover Limited | Wholesale & retail | 2019 |
| M&W Roofing Ltd | Construction | 2018 |
| M.R.V Own Business Invest Ltd | Extraterritorial | 2021 |
| M.R.V Own Business Ltd | Extraterritorial | 2021 |
| Mac's Handyman Limited | Construction | 2014 |
| Macavis Holdings Limited | Construction | 2023 |
| Machinex Works Ltd | Wholesale & retail | 2025 |
| Mack Rail Limited | Construction | 2019 |
| Macro Innovations Ltd | Administrative & support | 2012 |
| Maddox Property Consultants Limited | Professional & scientific | 2024 |
| Made With Index Ltd | Information & communication | 2025 |
| Maed Communications Ltd | Professional & scientific | 2015 |
| Magic IT Services Ltd | Information & communication | 2009 |
| Magnitude Recruitment Limited | Transport & logistics | 2025 |
| Main Supply Services Ltd | Construction | 2025 |
| Maison Dieu Guest House Ltd | Hospitality | 2021 |
| Maison Dover Properties Ltd | Real estate | 2020 |
| Majestic International Freight Forwarding Limited | Transport & logistics | 1991 |
| Malmains Farm Limited | Agriculture & fishing | 2022 |
| Malvern Lynch Property Limited | Real estate | 2018 |
| Mamoona Tattoo Limited | Other services | 2015 |
| Management and Marketing by Mario Ltd | Information & communication | 2026 |
| Manorial Real Estate Ltd | Real estate | 2023 |
| Mansion Garden Estates Limited | Construction | 2013 |
| Manston Motor Centre ( MMC ) Ltd | Wholesale & retail | 2020 |
| Manu Vide Toit Ltd | Extraterritorial | 2025 |
| Marc Pszczola Ltd | Financial services | 2013 |
| Margate Football Academy Limited | Education | 2018 |
| Margate Healthcare Limited | Wholesale & retail | 2025 |
| Maribeni Limited | Wholesale & retail | 2022 |
| Marina Mobility Limited | Real estate | 2017 |
| Marine Terrace Management Company (Deal) Limited | Households | 2004 |
| Maritime Skills Academy (Solent) Limited | Education | 2018 |
| Mark Anthony Baines Catering Limited | Hospitality | 2007 |
| Mark Steadman Ltd | Financial services | 2009 |
| Mark Walton Building Contractors Limited | Construction | 2024 |
| Market Square Dover Ltd | Wholesale & retail | 2022 |
| Market Square Food Ltd | Wholesale & retail | 2016 |
| Market Square News Ltd | Wholesale & retail | 2019 |
| Markwill Management Consulting Limited | Professional & scientific | 2014 |
| Marnian South East Limited | Construction | 2019 |
| Marsh Rail Ltd | Construction | 2016 |
| Martello Construction Limited | Construction | 2010 |
| Martello Security Consultancy Ltd | Administrative & support | 2020 |
| Martin Hythe Ltd | Real estate | 2009 |
| Martin Mill Goat Dairies | | 1986 |
| Masala Palace Ltd | Hospitality | 2026 |
| Mascil Limited | Construction | 2022 |
| Matchroom Boxing USA LLC | | 2018 |
| Matrix Securities Solution Ltd | Administrative & support | 2026 |
| Maud DE SAN Nicolas Ltd | Wholesale & retail | 2025 |
| Maxi Horeca Invest Ltd | Extraterritorial | 2021 |
| Maxi Horeca Ltd | Extraterritorial | 2021 |
| Maxim Cosmetics UK Ltd | Wholesale & retail | 2024 |
| Maxim Global Investments Holding LP | | 2017 |
| Maxton Court Residents Association RTM Company Limited | Households | 2003 |
| Mayfield Financial Services Limited | Financial services | 1995 |
| Mbal Holdings Limited | Professional & scientific | 2018 |
| MCC Property Renovations Ltd | Construction | 2020 |
| Mcdonnell Media Ltd | Administrative & support | 2009 |
| Mcor Limited | Wholesale & retail | 2026 |
| MD Production Invest Ltd | Professional & scientific | 2022 |