| Malik HX Ltd | Real estate | 2025 |
| Mallard Design Limited | Professional & scientific | 2006 |
| Mamjuls Ltd | Health & social care | 2015 |
| Mammoth E-Commerce Ltd | Wholesale & retail | 2021 |
| MANA1 Ltd | Other services | 2025 |
| Manchester Animation Festival Ltd | Information & communication | 2015 |
| Manchester Operating Company Limited | Hospitality | 2018 |
| Mandy Janes Ltd | Health & social care | 2021 |
| Maninka Investments Limited | Wholesale & retail | 2024 |
| Manir Health Ltd | Health & social care | 2022 |
| Manjil UK Limited | Wholesale & retail | 2021 |
| Manns Ltd | Transport & logistics | 2023 |
| Manor Competition Ltd | Professional & scientific | 2006 |
| Manor House (Shropshire) Limited | Real estate | 2018 |
| Manorcroft Decorators Limited | Construction | 2023 |
| Mansa Apartments HX Ltd | Real estate | 2025 |
| Mansa Apartments Ltd | Real estate | 2023 |
| Manshed Ltd | Professional & scientific | 2015 |
| Manson Electrical Solutions Limited | Construction | 2018 |
| Manzoor Consultancy Ltd | Administrative & support | 2011 |
| MAP Group Hospitality Ltd | Hospitality | 2024 |
| Maple Park Developments Limited | Real estate | 2024 |
| Mapledoram Reproductions Ltd. | Arts & recreation | 2013 |
| Maps - Betha Ltd | Information & communication | 2015 |
| Maramar (Holdings) Limited | Administrative & support | 2007 |
| Maranatha Healthcare Solutions Limited | Health & social care | 2015 |
| March Mill Design Limited | Professional & scientific | 2012 |
| Marconplant Limited | Administrative & support | 1970 |
| Marcus Beadle Ltd | Health & social care | 2012 |
| Marcus Handley Ltd | Professional & scientific | 2011 |
| Margaret Hurles Limited | Hospitality | 2020 |
| Marie Hughes Hair Studio Limited | Other services | 2002 |
| Mariola Limited | Health & social care | 2012 |
| Marita Garratt Ltd | Real estate | 2025 |
| Mark Galley Properties Ltd | Real estate | 2006 |
| Mark of Quality Limited | Wholesale & retail | 1997 |
| Market Arcade Limited | Hospitality | 2020 |
| Market of Choice Ltd | Wholesale & retail | 2022 |
| Marketing Signals Ltd | Administrative & support | 2015 |
| Marketing SPV Limited | Financial services | 2020 |
| Marldon Site Services Ltd | Professional & scientific | 2019 |
| Marmalade Dental Ltd | Health & social care | 2022 |
| Marsden Contracting Ltd | Construction | 2006 |
| Marsden Property Developments Ltd | Real estate | 2011 |
| Marsden Property Maintenance Ltd | Real estate | 2018 |
| Marsh and Marsh Properties Limited | Real estate | 2015 |
| Marsh Design Limited | Administrative & support | 2002 |
| Marshall (Homes) Limited | Construction | 1963 |
| Marshall (Joinery) Limited | Construction | 1960 |
| Marshall CDP Limited | Construction | 2023 |
| Marshall Pubco Ltd | Hospitality | 2024 |
| Marshall Taps Ltd | Hospitality | 2026 |
| Marshall(Real Estate)Limited | Real estate | 1968 |
| Martin Beresford Limited | Professional & scientific | 2012 |
| Martin Fitzpatrick Recruitment Limited | Professional & scientific | 2021 |
| Martins Mill Packaging Ltd | Wholesale & retail | 2008 |
| MAS Ventures Ltd | Real estate | 2020 |
| Mashinge Corporation Ltd | Real estate | 2025 |
| Masiza Limited | Health & social care | 2022 |
| Maskeen Bros Ltd | Real estate | 2024 |
| Maslak Design Limited | Administrative & support | 2010 |
| Masonic Media Limited | Information & communication | 2021 |
| Master Clean (UK) Limited | Administrative & support | 2001 |
| Master Matting Company Limited | Wholesale & retail | 1987 |
| Master Matting Installations Limited | Construction | 2001 |
| Master Matting Management LLP | | 2011 |
| Master Prime Ltd | Wholesale & retail | 2023 |
| Master Property Co. Ltd | Real estate | 2006 |
| Mastermind SPV6 Ltd | Real estate | 2017 |
| MAT Healthcare Recruitment Ltd | Administrative & support | 2017 |
| Mathsxpert Limited | Education | 2022 |
| Matjoint Solutions Limited | Construction | 2026 |
| Matrix Technology Solutions Limited | Education | 1993 |
| Matt Radcliffe Photo and Film Ltd | Information & communication | 2023 |
| Matt White Joiners Limited | Construction | 2009 |
| Matthew Bolsover Brickworks Limited | Construction | 2014 |
| Matthew Pell Ltd | Construction | 2026 |
| Matts Gym Club Ltd | Arts & recreation | 2022 |
| Mattymoves Ltd | Transport & logistics | 2024 |
| Maverick Deck Limited | Professional & scientific | 2022 |
| MAX Crossley (Halifax) Limited | Wholesale & retail | 2003 |
| MAX Pressure Limited | Arts & recreation | 2002 |
| MAX Training Solutions Ltd | Professional & scientific | 2022 |
| Maxime-N Ltd | Administrative & support | 2022 |
| Maxxinn Limited | Wholesale & retail | 2025 |
| Maya's Corner Ltd | Wholesale & retail | 2018 |
| Mayfair Solicitors Limited | Professional & scientific | 2016 |
| Mayfieldgrove Ltd | Hospitality | 2022 |
| Maypao Limited | Administrative & support | 2014 |
| Mayros Properties Ltd | Real estate | 2025 |
| Mazaleena Health Ltd | Wholesale & retail | 2019 |
| Mazid Limited | Health & social care | 2018 |
| Mazo Moon Ltd | Wholesale & retail | 2026 |
| MBH Associates Ltd | Health & social care | 2017 |
| MBH Projects Ltd | Construction | 2025 |
| MBH1 Properties Ltd | Real estate | 2024 |
| MC Electrical (Halifax) Limited | Construction | 2015 |
| MC Fabrications (Halifax) Limited | Manufacturing | 1996 |
| Mcallister Accountancy Limited | Professional & scientific | 2026 |
| Mcandrew (Textiles) Limited | Manufacturing | 1997 |