| M G Coachworks Limited | Wholesale & retail | 2003 |
| M J Evans Electrical Limited | Construction | 2007 |
| M N Holdings Limited | Financial services | 2005 |
| M P S Services Ltd | Manufacturing | 2002 |
| M R B Installations Limited | Administrative & support | 2010 |
| M T Porter Limited | Administrative & support | 2006 |
| M&N Education Consultancy Ltd | Education | 2017 |
| M. Buttkereit Limited | Manufacturing | 1985 |
| M. Doyle Brickwork Limited | Construction | 2007 |
| M. J. R. Management Construction Services Limited | Construction | 1999 |
| M. Johnson Computer Services Limited | Professional & scientific | 1981 |
| M. S. Groves Limited | Professional & scientific | 1984 |
| M. T. Textures Limited | Construction | 2006 |
| M.A.S.K. (Mossley After School Club) Limited | Other services | 1999 |
| M.H.Hill Limited | Wholesale & retail | 1933 |
| M.T. Kaill (Plant Hire) Limited | Construction | 1976 |
| M.T. Services (North West) Limited | Wholesale & retail | 2006 |
| MAC & PC Centre Stockport Limited | Wholesale & retail | 2019 |
| Mac-One Sound Financial Services Limited | Professional & scientific | 2002 |
| Macclesfield Golf Club Limited | Arts & recreation | 1946 |
| Macclesfield School of Gymnastics Limited | Education | 2002 |
| Mackinnon & Saunders Limited | Information & communication | 1995 |
| Macouti Limited | Hospitality | 2003 |
| Maestro Leisure Limited | | 1986 |
| Magi Software Limited | Information & communication | 2011 |
| Magic Taping and Jointing Ltd | Construction | 2014 |
| Magus Electronics Limited | Manufacturing | 2004 |
| Maher Display Limited | Real estate | 2001 |
| MAID2CLEAN (UK) Ltd | Administrative & support | 2001 |
| Mainair Microlight Centre Limited | Transport & logistics | 2003 |
| Maines Investments Ltd | Real estate | 2019 |
| Majorsite Limited | Real estate | 1995 |
| Make IT Outdoors Limited | Extraterritorial | 2012 |
| Make US Another Brew LLP | | 2019 |
| Making Space | Health & social care | 1982 |
| Malcolm Shaw & SON Limited | Other services | 2005 |
| Malpas Barbeque Ltd | Hospitality | 2020 |
| Malpas Technical Services Limited | Administrative & support | 2007 |
| Malton CAD Services Ltd | Professional & scientific | 2017 |
| Management Systems Services Limited | Professional & scientific | 1989 |
| Manchester Automatic Machining Company Limited | Manufacturing | 1948 |
| Manchester Economics Limited | Administrative & support | 2004 |
| Manchester Retina and Uveitis Clinic Limited | Health & social care | 2017 |
| Mangoletsi (Holdings) Limited | Wholesale & retail | 1967 |
| Manners Pimblett Solicitors Limited | Professional & scientific | 2006 |
| Mansfield Victoria Limited | Professional & scientific | 2005 |
| Mansley Caldwell Limited | Wholesale & retail | 2002 |
| Mapline Limited | | 1989 |
| Marafie Consultancy UK Ltd | Professional & scientific | 2019 |
| Marayon Limited | Professional & scientific | 2000 |
| Marcellino Limited | Professional & scientific | 1987 |
| Marian Neculai Ltd | Transport & logistics | 2019 |
| Mark Boyd Limited | Professional & scientific | 2006 |
| Mark of Safety Consulting and Training Ltd | Professional & scientific | 2019 |
| Mark Williams Motoring Limited | Real estate | 1998 |
| Mark Worthington Jewellers Ltd | Wholesale & retail | 1999 |
| Markaston Limited | Professional & scientific | 2002 |
| Marketing Discoveries Limited | | 1982 |
| Marple Hall Property Ltd | Real estate | 2022 |
| Marple Travel Hyde Limited | Administrative & support | 1990 |
| Marshall-Andrew (Holdings) Limited | | 1944 |
| Martin Moore Ltd. | Wholesale & retail | 2000 |
| Martin Moore Manufacturing Limited | Manufacturing | 1998 |
| Martin Shaw Joinery Limited | Construction | 2015 |
| Martina Furniture Limited | Professional & scientific | 2003 |
| Martini Henry Consultants Ltd | Real estate | 2005 |
| Mason Management Services Ltd | Professional & scientific | 2005 |
| Masscare Ltd | Manufacturing | 2004 |
| Master-Tee Limited | | 1992 |
| Material Applications Limited | Manufacturing | 1956 |
| Material Edge Limited | Wholesale & retail | 2004 |
| Mathan Limited | Wholesale & retail | 2007 |
| Matrix Physio Limited | Other services | 2014 |
| Matthew Group Ltd | Professional & scientific | 2019 |
| Matthew James Group Ltd | Administrative & support | 2024 |
| Maveen Court Management Company Limited | Households | 1973 |
| Mavis Mccue Interpreting Service Limited | Health & social care | 2002 |
| Mawdsley Landscapes Ltd | Administrative & support | 2003 |
| MAX Electrical Services Ltd | Construction | 2003 |
| Mayflower Engineering Design Ltd | Professional & scientific | 2024 |
| Maylands Park Limited | Households | 2024 |
| Maymask (262) Limited | Financial services | 2026 |
| MB Electrical (NW) Ltd | Households | 2007 |
| MBM Property Limited | Real estate | 2001 |
| MBP Sales Limited | Professional & scientific | 2002 |
| MCA Manufacturing Consultancy Limited | Professional & scientific | 2005 |
| Mcclements & Mcclements Limited | Real estate | 2004 |
| Mcnamara Hotels Limited | Extraterritorial | 2004 |
| Mcpherson Consultancy Limited | Professional & scientific | 2018 |
| Mcuk M&E Services Ltd | Construction | 2024 |
| Meadowcreek Limited | Administrative & support | 1999 |
| Media Blacktop Ltd | Information & communication | 2022 |
| Melted Media Limited | Information & communication | 2005 |
| Mercian Electrical Services Ltd | Construction | 2013 |
| Merepark Brown Street Limited Partnership | | 2003 |
| Merlin Commercial Limited | Real estate | 2020 |
| Merlin Minds Limited | Education | 2001 |
| Merlot Tekstil Limited | Manufacturing | 1995 |
| Mersey Restoration Limited | | 1990 |
| Mersey Valley Sports Club | Arts & recreation | 2005 |