| Maple Plastics (EOT) Limited | Financial services | 2023 |
| Marble Property Holdings Ltd | Hospitality | 2015 |
| Marcat Plastics Ltd | Manufacturing | 2020 |
| Marclo Ltd | Professional & scientific | 2025 |
| Mardale Developments Limited | Construction | 2009 |
| Maria James Property Ltd | Real estate | 2024 |
| Maria Modes (Macclesfield) Limited | Wholesale & retail | 2015 |
| Marie Beech Rentals Ltd | Administrative & support | 2021 |
| Mariko Homes Ltd | Real estate | 2023 |
| Marillion Technology Group Ltd | Administrative & support | 2017 |
| Marinaki Macintosh Limited | Real estate | 2018 |
| Mario's Styles Limited | Other services | 2024 |
| Mark Andy UK. Limited | Wholesale & retail | 1993 |
| Mark Atkinson Audio Limited | Information & communication | 2013 |
| Mark Balfe Builders Ltd | Construction | 2014 |
| Mark Bell Architects Limited | Professional & scientific | 2016 |
| Mark Codys Document Control Services Limited | Professional & scientific | 2007 |
| Mark Devereux Projects | Arts & recreation | 2013 |
| Mark Edwards Associates Limited | Construction | 2003 |
| Mark Russell Ltd | Households | 2021 |
| Mark Simpkin Limited | Wholesale & retail | 2001 |
| Mark Stoneley Limited | Construction | 2020 |
| Marketing Doris Limited | Professional & scientific | 2007 |
| Marketing Metas Limited | Professional & scientific | 2022 |
| Marketingtwentyone Limited | Professional & scientific | 2012 |
| Marlpit Ventures Limited | Information & communication | 2026 |
| Marquis Financial Services Limited | Financial services | 2007 |
| Marquis Specialist Finance Limited | Financial services | 2024 |
| Marshall Anthony Ltd | Construction | 2006 |
| Marshall Chaplin Development Limited | Professional & scientific | 2005 |
| Marshalls Property Rentals Ltd | Real estate | 2017 |
| Marshride Limited | Real estate | 2017 |
| Martin Advisory Limited | Professional & scientific | 2021 |
| Martin Properties Limited | Administrative & support | 2011 |
| Marton Meadows Golf and Events Limited | Arts & recreation | 2022 |
| Marton Storage Ltd | Transport & logistics | 2021 |
| Martyn Heywood Ltd | Construction | 2011 |
| Mary Joy Community Crafts Outlet Limited | Wholesale & retail | 2018 |
| Mash Guru Ltd | Hospitality | 2013 |
| Mason Carpentry Innovations Ltd | Construction | 2024 |
| Mason Property Investments Limited | Real estate | 2016 |
| Massconsult Limited | Wholesale & retail | 2021 |
| Massey Farms Ltd | Agriculture & fishing | 2024 |
| Massey House Macclesfield Limited | Households | 2013 |
| Masterpile Ltd | Construction | 2015 |
| MAT Consultancy Limited | Professional & scientific | 2002 |
| Matchdouble Limited | Professional & scientific | 1991 |
| Matchpoint (North West) Ltd | Education | 2013 |
| Maternity Consultancy Limited | Health & social care | 2023 |
| Mather & Co Limited | Arts & recreation | 1995 |
| Matherpropertylandscape Ltd | Agriculture & fishing | 2020 |
| Mathers Hospitality Ltd | Hospitality | 2025 |
| Mathew Bethell Ltd | Construction | 2020 |
| Matmi New Media Design Ltd | Information & communication | 2001 |
| Matteo Noel Ltd | Hospitality | 2025 |
| Matterello (Palazzo) Limited | Hospitality | 2021 |
| Matthews Design Limited | Arts & recreation | 2007 |
| Mauve Group Ltd | Real estate | 2020 |
| Maverick Investments Limited | Real estate | 2002 |
| MAW Art Ltd | Arts & recreation | 2026 |
| MAX Capital Investments Ltd | Financial services | 2024 |
| MAX Walker Yacht Delivery Limited | Transport & logistics | 2020 |
| Maxheatufh Ltd | Wholesale & retail | 2024 |
| Maxi Grabs Limited | Water & waste | 2024 |
| Maximilian Sykes Limited | Information & communication | 2017 |
| Maximise Social Ltd | Professional & scientific | 2018 |
| Maximum Clarity Limited | Information & communication | 2007 |
| Maxis Property Limited | Real estate | 2014 |
| Maxwell Probate and Asset Research (UK) Ltd | Other services | 2017 |
| Mayer Distributions Ltd | Wholesale & retail | 2023 |
| Mayfair Homes (NW) Limited | Real estate | 2016 |
| Mayfair Strategic Investments Limited | Financial services | 2022 |
| Mayne Technology Ltd | Information & communication | 2019 |
| Maywood Developments Limited | Construction | 2005 |
| Maywood Homes Limited | Construction | 2013 |
| Mazy Group Limited | Wholesale & retail | 2020 |
| MB Big Boss Holdings Limited | Financial services | 2024 |
| MB Industrial Doors Ltd | Manufacturing | 2025 |
| MBD DOM Ltd | Administrative & support | 2024 |
| Mccormick Estates Limited | Real estate | 2021 |
| Mccrory (Holdings) Limited | Financial services | 2015 |
| Mccrory Brickwork (UK) Limited | Construction | 2015 |
| Mccrory Brickwork Limited | Construction | 1997 |
| Mccrory Construction Group Limited | Administrative & support | 2020 |
| Mccrory Developments Limited | Administrative & support | 2020 |
| Mccrory Investments Limited | Administrative & support | 2020 |
| Mcgeehin Engineering Limited | Professional & scientific | 2007 |
| Mcgillivray Holdings Ltd | Professional & scientific | 2024 |
| Mchale Associates Limited | Professional & scientific | 2007 |
| Mckenna Barbers Limited | Wholesale & retail | 2017 |
| Mcom Systems Limited | Information & communication | 2012 |
| MD Apps Ltd | Information & communication | 2012 |
| MDJ Grindey Ltd | Agriculture & fishing | 2021 |
| MDR Law Limited | Professional & scientific | 2023 |
| Mdsec Consulting Ltd | Information & communication | 2012 |
| Meadowfield Apartments Limited | Hospitality | 2020 |
| Meadowflow Strategy Limited | Administrative & support | 2025 |
| Meadowside Management Ltd | Households | 2019 |
| Mech-Maintenance Ltd | Manufacturing | 2024 |
| Medaax (EOT) Limited | Administrative & support | 2022 |