| Medway Badminton Association Limited(The) | Arts & recreation | 1983 |
| Medway Builders Ltd | Construction | 2019 |
| Medway Car Supermarket Ltd | Wholesale & retail | 2013 |
| Medway Cares | Health & social care | 2011 |
| Medway Climate Control Limited | Public administration | 2023 |
| Medway Coasters Limited | | 1982 |
| Medway Community Healthcare C.I.C. | Health & social care | 2010 |
| Medway Cruising Club Developments Limited | Real estate | 2004 |
| Medway Decorating Ltd | Construction | 2024 |
| Medway Distillers Limited | Extraterritorial | 2014 |
| Medway District Citizens Advice Bureau | Information & communication | 2005 |
| Medway Drive-Thru Pharmacy Ltd | Health & social care | 2012 |
| Medway Electrical Services Limited | Construction | 2024 |
| Medway Electrician Limited | Construction | 2014 |
| Medway Equine Competitions Ltd | Wholesale & retail | 2025 |
| Medway Garage Services Ltd | Wholesale & retail | 2025 |
| Medway Heating Ltd | Construction | 2025 |
| Medway Holdings Ltd | Construction | 2020 |
| Medway Horsebox Hire Ltd | Transport & logistics | 2022 |
| Medway Language Café C.I.C. | Education | 2025 |
| Medway Licensed Taxis Ltd | Transport & logistics | 2022 |
| Medway Mobile Limited | Wholesale & retail | 2018 |
| Medway MOT Centre Ltd | Wholesale & retail | 2011 |
| Medway Munch Ltd | Hospitality | 2026 |
| Medway Play LAB CIC | Arts & recreation | 2022 |
| Medway Plus Limited | Extraterritorial | 2012 |
| Medway Property Matters Limited | Real estate | 2017 |
| Medway Residential Solutions Ltd | Real estate | 2015 |
| Medway Revival Fellowship Ltd | Other services | 2020 |
| Medway Ride Ltd | Transport & logistics | 2025 |
| Medway Scaffolding Solutions Limited | Construction | 2016 |
| Medway Spanish Cleaning Supplies Ltd | Wholesale & retail | 2023 |
| Medway Stoves Ltd | Construction | 2025 |
| Medway Supermarket Ltd | Wholesale & retail | 2009 |
| Medway Turkish Barbers Gillingham Limited | Other services | 2026 |
| Medway Vending UK Ltd | Wholesale & retail | 2023 |
| Medway Volunteer Centre | Extraterritorial | 2011 |
| Medway Watersports Trust Limited | Arts & recreation | 2010 |
| Medway Wealth Estates Limited | Financial services | 2025 |
| Mega Beatz Limited | Wholesale & retail | 2015 |
| Mega Gefsi Limited | Hospitality | 2024 |
| Mega Health Group Holding Limited | Wholesale & retail | 2026 |
| Mega Holding (UK) Limited | Extraterritorial | 2014 |
| Mega Stone Collection Co., Ltd | Manufacturing | 2023 |
| Mega Tech (Kent) Limited | Wholesale & retail | 2014 |
| Megapenthes Ltd | Transport & logistics | 2025 |
| Mekafrax Ltd | Wholesale & retail | 2015 |
| Mekkas Barber Ltd | Other services | 2026 |
| Mellow Investments Limited | Administrative & support | 2022 |
| Melody Collective Ltd | Education | 2026 |
| Melville Communications Limited | Professional & scientific | 2008 |
| Merch Ltd | Administrative & support | 2015 |
| Merck Life Science UK Limited | Wholesale & retail | 1960 |
| Mere Park Creamery Ltd | Extraterritorial | 2016 |
| Merit Financial Services Limited | Real estate | 2008 |
| Mert (GB) 4 Limited | Wholesale & retail | 2012 |
| Mertec (Kent) Limited | Wholesale & retail | 2013 |
| Mervent Ltd | Information & communication | 2003 |
| Merwais N Ltd | Transport & logistics | 2026 |
| Merwin International Co., Ltd | Wholesale & retail | 2017 |
| Messy Solutions Ltd | Professional & scientific | 2018 |
| Metalfab Engineering Ltd | Manufacturing | 2005 |
| Metern Ltd. | Agriculture & fishing | 2023 |
| Method Productions Ltd | Information & communication | 2021 |
| Metro Contractors Ltd | Construction | 2018 |
| Metrolove Ltd | Transport & logistics | 2015 |
| Metrolove Properties Ltd | Real estate | 2025 |
| Mezini & Co UK Ltd | Construction | 2023 |
| MF Groundworks & Maintenance Limited | Construction | 2020 |
| MF Offshore Limited | Information & communication | 2025 |
| MG Cleaning Ltd | Administrative & support | 2016 |
| MG Clinical Assessment Services Limited | Health & social care | 2026 |
| MG Fire Services Limited | Manufacturing | 2018 |
| MG Silver Ltd | Wholesale & retail | 2021 |
| MG Thermal Insulation Ltd | Construction | 2026 |
| MGC Trading Ltd | Professional & scientific | 2020 |
| MGF Traffic Management Limited | Construction | 2023 |
| MGJ Trading Ltd | Financial services | 2022 |
| MGW Corp Ltd | Professional & scientific | 2025 |
| MHQ Engineering Ltd | Professional & scientific | 2022 |
| Micautos Mobile Mechanic Ltd | Wholesale & retail | 2025 |
| Michael Langford Limited | Manufacturing | 2021 |
| Michael Wright Holdings Ltd | Real estate | 2024 |
| Michaelson&Son Ltd | Construction | 2016 |
| Michphill Limited | Construction | 2017 |
| MICKY2021 Ltd | Health & social care | 2025 |
| Midda Services Ltd | Information & communication | 2008 |
| Mierscourt Limited | Professional & scientific | 2017 |
| Migdine Ltd | Transport & logistics | 2025 |
| Mikmwa Ltd | Health & social care | 2024 |
| MIL Clothing Ltd | Manufacturing | 2024 |
| Milan Engineers Limited | Administrative & support | 2001 |
| Mileos Ltd | Real estate | 2019 |
| Miles & Co Electrical Limited | Construction | 2025 |
| Mill Farm Developments Misterton Ltd | Construction | 2022 |
| Million Success Group Limited | Professional & scientific | 2018 |
| Milly Mooo Ltd | Wholesale & retail | 2022 |
| Milly Roman Ltd | Manufacturing | 2023 |
| Milton Creek Limited | Financial services | 2018 |
| Mimo Brands Limited | Professional & scientific | 2012 |