| Luna Invictus Limited | Health & social care | 2025 |
| Luvhagrant Limited | Transport & logistics | 2013 |
| Luxury Bespoke Homes Ltd | Real estate | 2020 |
| Luxury Chefs Ltd | Hospitality | 2023 |
| Luxxe Promotions Ltd | Professional & scientific | 2025 |
| Lyferoots Ltd | Wholesale & retail | 2019 |
| Lyhty Ltd | Hospitality | 2025 |
| Lyneton Limited | Professional & scientific | 2017 |
| Lyttle Stór Limited | Wholesale & retail | 2024 |
| LZN Kent Ltd | Health & social care | 2019 |
| M & D Unit Rentals Ltd | Real estate | 2016 |
| M & L Travel Limited | Transport & logistics | 2009 |
| M & M Construction (Kent) Limited | | 2005 |
| M Barbers Ltd | Other services | 2018 |
| M K Wilson Limited | Professional & scientific | 2005 |
| M&A Therapies Ltd | Public administration | 2022 |
| M.C.K Maintenance Ltd | Administrative & support | 2025 |
| M.G. Saunders & Sons (Sawdust & Woodchips) Limited | Wholesale & retail | 1966 |
| M.R.S. Electrical Limited | Construction | 2005 |
| M365ACADEMY Ltd | Education | 2021 |
| Mabomba Ltd | Administrative & support | 2018 |
| Mace Asset Developments Ltd | Real estate | 2025 |
| Mace Holdings Kent Ltd | Real estate | 2022 |
| Mackul Developments Limited | Real estate | 2025 |
| Madayag Ltd | Health & social care | 2014 |
| Madina Supermarket Margate Ltd | Wholesale & retail | 2025 |
| Madre Margate Ltd | Manufacturing | 2024 |
| Magnet Micropub Limited | Other services | 2019 |
| Maisey Flooring Ltd | Construction | 2022 |
| Maisie Hill Ltd | Other services | 2019 |
| Major 1 Healthcare Solutions Ltd | Health & social care | 2023 |
| Makar Estate Ltd | Real estate | 2017 |
| Makarlo Ltd | Real estate | 2022 |
| Mama Jinny's Limited | Hospitality | 2023 |
| Mama Moves Ltd | Arts & recreation | 2023 |
| Mambo Ecology Ltd | Professional & scientific | 2025 |
| Mambo Gardens Ltd | Administrative & support | 2018 |
| Manhari Letting Ltd | Real estate | 2022 |
| Manifest Property Limited | Professional & scientific | 2013 |
| Manna South Indian Restaurant Ltd | Hospitality | 2025 |
| Manor House Forest School Limited | Education | 2022 |
| Manor House Kindergarten Ltd | Education | 2016 |
| Manor House Minster Nursery Ltd | Health & social care | 2022 |
| Manor House Nursery Group Ltd | Education | 2010 |
| Manor House Nursery School Ltd | Education | 2010 |
| Manston Auto Centre Limited | Wholesale & retail | 2020 |
| Manwaring Shipping Limited | Transport & logistics | 2012 |
| MAR & Hughes Property Ltd | Real estate | 2023 |
| MAR Clearance Services Ltd | Water & waste | 2021 |
| MAR Enterprises Global Limited | Wholesale & retail | 2024 |
| Maranatha Property Limited | Real estate | 2020 |
| Marbleside Care Limited | Health & social care | 2019 |
| Marbleside Limited | Real estate | 1996 |
| March Studio Ltd | Professional & scientific | 2020 |
| Mardex Estates Limited | Real estate | 2007 |
| Marella Properties Limited | Extraterritorial | 2009 |
| Margate 360 Ltd | Other services | 2023 |
| Margate Apartments Ltd | Hospitality | 2022 |
| Margate Arts Club CIC | Arts & recreation | 2016 |
| Margate Assembly Ltd | Arts & recreation | 2023 |
| Margate Best Valeting Limited | Wholesale & retail | 2024 |
| Margate Bistro Limited | Hospitality | 2019 |
| Margate Chicken Limited | Hospitality | 2025 |
| Margate Creative Land Trust | Arts & recreation | 2021 |
| Margate Design Collective Ltd | Education | 2021 |
| Margate Food Centre Ltd | Wholesale & retail | 2025 |
| Margate Food Investments Ltd | Hospitality | 2024 |
| Margate Football Club Community Trust | Arts & recreation | 2014 |
| Margate Football Club Limited | Arts & recreation | 1978 |
| Margate Hand Car Wash Ltd | Other services | 2010 |
| Margate Harbour ARM Limited | Real estate | 2008 |
| Margate High Street CIC | Administrative & support | 2024 |
| Margate Home Pound Plus Ltd | Wholesale & retail | 2020 |
| Margate Hospitality Limited | Hospitality | 2026 |
| Margate Independent Foodbank Community Interest Company | Hospitality | 2020 |
| Margate Makers Studio Ltd | Other services | 2025 |
| Margate Muffins Ltd | Information & communication | 2025 |
| Margate Pilates Studio Ltd | Extraterritorial | 2018 |
| Margate Pizza Kent Ltd | Hospitality | 2025 |
| Margate Pride CIC | Arts & recreation | 2016 |
| Margate Property Investment Limited | Real estate | 2022 |
| Margate Queer Library & Archive CIC | Arts & recreation | 2025 |
| Margate Radio CIC | Information & communication | 2020 |
| Margate Resistance Ltd | Arts & recreation | 2024 |
| Margate Shawarma Kent Ltd | Hospitality | 2026 |
| Margate Skateboard Club CIC | Education | 2023 |
| Margate Soul Festival Limited | Arts & recreation | 2016 |
| Margate Town Action Group CIC | Health & social care | 2024 |
| Margate Town Team CIC | Professional & scientific | 2013 |
| Margate UK Chicken Ltd | Hospitality | 2025 |
| Margate Wine Ltd | Manufacturing | 2025 |
| Margate Yoga Studio Ltd | Education | 2018 |
| Margatemediacommunityproject Limited | Other services | 2018 |
| Margatron CIC | Education | 2026 |
| Margaux Home Ltd. | Wholesale & retail | 2003 |
| Margrape Ltd | Manufacturing | 2024 |
| Mariachi Bars Ltd | Hospitality | 2025 |
| Mariachi Group LLP | | 2021 |
| Marina Apartments Ltd | Real estate | 2018 |
| Marine Cloud Limited | Administrative & support | 2012 |