| Matos Properties Limited | Real estate | 2022 |
| Matrix Safety Training & Support Ltd | Professional & scientific | 2023 |
| Matson Pipework Services Limited | Construction | 2018 |
| Matt Howard Services Limited | Agriculture & fishing | 2016 |
| Matt Matts Cafe Limited | Hospitality | 2023 |
| MATTERS2ME CIC | Administrative & support | 2025 |
| Matty Evans Magic Ltd | Arts & recreation | 2019 |
| Matwood Styling Limited | Other services | 2026 |
| MAX Jones Ltd | Professional & scientific | 2019 |
| Max&I Construction Ltd | Construction | 2019 |
| Maxi Healthcare Ltd | Health & social care | 2020 |
| Maxwell and Cecil Limited | Administrative & support | 2016 |
| MAY Media Productions Ltd | Information & communication | 2023 |
| Maybel's Moorings Ltd | Real estate | 2025 |
| Maypole Bells Limited | Manufacturing | 2024 |
| Mayrec Ltd | Administrative & support | 2026 |
| Mazit&N Limited | Construction | 2019 |
| MB Construction Management Services Ltd | Construction | 2018 |
| MB Farms (Produce) Limited | Wholesale & retail | 2002 |
| MB Infrastructure Limited | Construction | 2021 |
| Mb&M Plumbing & Heating Ltd | Construction | 2025 |
| MC Services (Kent) Limited | Construction | 2018 |
| MCA Bismuth Ltd | Administrative & support | 2023 |
| MCA Investments Limited | Real estate | 2011 |
| MCA Securitas Limited | Construction | 2016 |
| Mccabe Ford Williams Limited | Professional & scientific | 2001 |
| Mccann Traders Ltd | Wholesale & retail | 2024 |
| MCD Music Limited | Administrative & support | 2010 |
| MCD Trade Ltd | Construction | 2021 |
| Mcdonald Services Limited | Information & communication | 2011 |
| Mcfw Ltd | Transport & logistics | 2024 |
| Mckenzie-Groom Ltd | Construction | 2015 |
| Mcnealy Brown Group Limited | Financial services | 2001 |
| Mcnealy Brown Group Trustee Limited | Professional & scientific | 2022 |
| Mcnealy Brown Limited | Manufacturing | 1984 |
| Mcneill Contract Services Ltd | Transport & logistics | 2024 |
| Mcquade Civils Ltd | Other services | 2019 |
| MCU Ltd | Construction | 2017 |
| MDO Pipefitting Solutions Limited | Construction | 2019 |
| MDR Barbers Ltd | Other services | 2025 |
| MDT Group Ltd | Manufacturing | 2017 |
| ME WOK Limited | Hospitality | 2026 |
| ME10 Limited | Construction | 2013 |
| ME9 Solutions Ltd | Hospitality | 2026 |
| Meadfoot 1967 Limited | Extraterritorial | 2015 |
| Meadows Consulting Ltd | Professional & scientific | 2023 |
| Meare Consulting Limited | Professional & scientific | 2021 |
| MEB Building Services Limited | Construction | 2006 |
| MEB Electrical Limited | Extraterritorial | 2017 |
| Mechanicalworx Limited | Administrative & support | 2023 |
| Medalert Solutions Limited | Health & social care | 2025 |
| Media Edge London Limited | Information & communication | 2009 |
| Media Paper Management Limited | Wholesale & retail | 2001 |
| Mediabrians Limited | Information & communication | 2025 |
| Medic Investments (UK) Ltd | Real estate | 2021 |
| Medigold Services Limited | Health & social care | 2017 |
| Medusa Studios Limited | Other services | 2026 |
| Medway Law Limited | Administrative & support | 2014 |
| Medway Metalworks Limited | Manufacturing | 2018 |
| Megamerchant UK Ltd | Extraterritorial | 2012 |
| Megasales PVT Ltd | Wholesale & retail | 2019 |
| Meitavel Limited | Wholesale & retail | 2023 |
| Melary Kapapiro Limited | Health & social care | 2015 |
| Merbn Limited | Wholesale & retail | 2026 |
| Mercator Markings Limited | Administrative & support | 2002 |
| Mercer Communications Ltd. | Administrative & support | 2017 |
| Mero Holdings Limited | Information & communication | 2022 |
| Mervo Trans Limited | Transport & logistics | 2010 |
| Mesrad Commercial Ltd | Real estate | 2026 |
| MFG Buy and Sell Cars Ltd | Wholesale & retail | 2025 |
| MFW Limited | Professional & scientific | 2005 |
| MFW Partnership Ltd. | Professional & scientific | 1988 |
| MG Air Conditioning Limited | Construction | 2024 |
| MG Metal Holdings Ltd | Professional & scientific | 2004 |
| MGS Brickwork Limited | Construction | 2022 |
| MH Engineering (Kent) Limited | Professional & scientific | 2025 |
| MI Computers Ltd | Information & communication | 2025 |
| Michael MAK Ltd | Transport & logistics | 2026 |
| Michael Nutt Decorators Limited | Construction | 2008 |
| Michael Stephens & Co Limited | Professional & scientific | 2003 |
| Michael's Solution Services Ltd | Real estate | 2022 |
| Michaelaiza Limited | Real estate | 2024 |
| Michel Transport Logistics Ltd | Transport & logistics | 2016 |
| Michelsons UK Limited | Manufacturing | 2009 |
| MID Kent Electrical Engineering Company Limited | Manufacturing | 1971 |
| MID Kent Memorials Ltd | Manufacturing | 2022 |
| MID Kent Mezzanine Limited | Administrative & support | 2015 |
| Middlefields Limited | Construction | 1981 |
| Midkent IT Solutions Ltd | Information & communication | 2019 |
| Mighty Doors Ltd | Construction | 2025 |
| Milade Aura Ltd | Wholesale & retail | 2026 |
| Miles & Sons Homes Ltd | Real estate | 2025 |
| MILLENK9SERVICES Ltd | Administrative & support | 2021 |
| Miller & Osborne Property Consultants Ltd | Real estate | 2022 |
| Millfield (Bethersden) Management Limited | Households | 2014 |
| Millhouse Maidstone Ltd | Administrative & support | 2025 |
| Millie Rentals Limited | Households | 2026 |
| Millwood Court Residents Company Limited | Real estate | 1999 |
| Milo & Miles Limited | Administrative & support | 2013 |
| Milton Bar Ltd | Hospitality | 2026 |