| Macclesfield Wheelers Ltd | Arts & recreation | 2023 |
| Macclesfog Ltd | Extraterritorial | 2022 |
| Mace Holdings Limited | Real estate | 2016 |
| Machin Exercise Studios Ltd | Arts & recreation | 2016 |
| Machin Property Investments Ltd | Real estate | 2025 |
| Machine Learning Technologies Limited | Professional & scientific | 2023 |
| Macquarie Ltd | Hospitality | 2020 |
| Mactech (Europe) Limited | Wholesale & retail | 1988 |
| Mactech Europe Offshore Limited | Extraterritorial | 2013 |
| Made to Measure Care Finder Limited | Health & social care | 2023 |
| Made to Roam Limited | Manufacturing | 2022 |
| Madsummer Games Ltd | Arts & recreation | 2024 |
| Magnix Services Limited | Administrative & support | 2020 |
| Magnusit Limited | Information & communication | 2020 |
| Maiyas Care Solutions Limited | Administrative & support | 2024 |
| Majestical Ltd | Information & communication | 2018 |
| MAK & Phillips Development Group Limited | Construction | 2024 |
| Makyla&Gabe Co Ltd | Real estate | 2024 |
| Malaga Property Limited | Professional & scientific | 2010 |
| Malbon Townsend Ltd | Financial services | 2003 |
| Malileys Art Ltd | Wholesale & retail | 2023 |
| Mallorca Property Limited | Professional & scientific | 2010 |
| Mama FUA Cleaners Ltd | Administrative & support | 2024 |
| Manana Investments Limited | Construction | 2015 |
| Manchester Aviation Technical Services Ltd | Professional & scientific | 2023 |
| Manchester Road Property Management Ltd | Households | 2021 |
| Manchester Stock Xchange Ltd | Wholesale & retail | 2015 |
| Mango and Marmalade Stories Ltd | Information & communication | 2024 |
| Manner Borne Chauffeur Services Ltd | Transport & logistics | 2019 |
| Manner Estates Limited | Professional & scientific | 2002 |
| Manning Brothers Ltd | Hospitality | 2025 |
| Manton Property Group Ltd | Construction | 2024 |
| Manyana Ltd | Education | 2008 |
| MAP Financial Cheshire Limited | Administrative & support | 2017 |
| Marbella Property Limited | Professional & scientific | 2010 |
| Mardale Holdings Ltd | Construction | 2022 |
| Marine View Lytham Freehold Ltd | Construction | 2021 |
| Marinha’S Afro Hair Congelton Ltd | Other services | 2022 |
| Mark a Beech Ltd | Construction | 2018 |
| Mark Littler Limited | Professional & scientific | 2018 |
| Mark Skellern Limited | Transport & logistics | 2007 |
| Marks Events Ltd | Hospitality | 2020 |
| Marlimo Limited | Professional & scientific | 2016 |
| Marmaduke Creative Ltd | Professional & scientific | 2019 |
| Marqforde Ltd | Wholesale & retail | 2023 |
| Marshlal Electronics and Calibration Services Limited | Manufacturing | 1995 |
| Marson Support Services Limited | Information & communication | 2011 |
| Marsuma Limited | Extraterritorial | 2012 |
| Martha's House Limited | Health & social care | 2025 |
| Marvix Marketing Limited | Other services | 2008 |
| Marwell Recruitment Limited | Administrative & support | 2026 |
| Mary MAE Vintage Ltd | Other services | 2013 |
| Maskho Healthcare Services Ltd | Health & social care | 2025 |
| Matthews Garden Makeovers Ltd | Administrative & support | 2007 |
| Matthews Software Service Limited | Information & communication | 2026 |
| MB Investment Property Ltd | Real estate | 2023 |
| Mccalco Ltd | Information & communication | 2020 |
| Mccalco Property Ltd | Real estate | 2022 |
| Mccarvill Consultancy Group Ltd | Construction | 2025 |
| Mcdermott & Daughters Holdings Limited | Real estate | 2019 |
| Mcintoshhodgson Limited | Wholesale & retail | 2017 |
| Mckenna 4 M&E Ltd | Professional & scientific | 2014 |
| MCR Fire Systems Ltd | Construction | 2023 |
| Mcweeney Safety Consultancy Limited | Professional & scientific | 2023 |
| Meacher Systems Limited | Professional & scientific | 2019 |
| Meadows & More Ltd | Administrative & support | 2026 |
| Meadowside Developments Building Contractors Ltd | Construction | 2013 |
| Mear Property Development Limited | Professional & scientific | 2013 |
| Meat the Greek Holdings Limited | Hospitality | 2025 |
| Mechandling Limited | Manufacturing | 1998 |
| Mechanical Power Transmission Limited | Financial services | 2021 |
| Medhurst Green Holdings Limited | Financial services | 2026 |
| Mediterraneo Property Limited | Professional & scientific | 2009 |
| Medlicott Motors Ltd | Wholesale & retail | 2024 |
| Medusa's Garden & Gifts Ltd | Wholesale & retail | 2023 |
| Melo Franco Equine Ltd | Professional & scientific | 2025 |
| MEP Direct Limited | Administrative & support | 2016 |
| Mere Supplies Ltd | Wholesale & retail | 2020 |
| Mereview Associates Ltd | Professional & scientific | 2018 |
| Mertrim Limited | Professional & scientific | 2012 |
| Meryl Fabrics Ltd. | Manufacturing | 2020 |
| Meryl Medical Limited | Manufacturing | 2016 |
| Mestup Limited | Professional & scientific | 2012 |
| Mg-Techtalent Ltd | Information & communication | 2025 |
| Mgec North West Ltd | Construction | 2019 |
| MH Treecare Ltd | Agriculture & fishing | 2022 |
| Mhodgson Holdings Limited | Real estate | 2022 |
| Mhor Venanci Limited | Real estate | 2016 |
| MI Education Hub Limited | Education | 2025 |
| Michael Green Bodyworks Limited | Wholesale & retail | 2013 |
| Mickleden Holdings Limited | Financial services | 2023 |
| Mifiesta Limited | Professional & scientific | 2018 |
| Migwop Limited | Professional & scientific | 2012 |
| Mike India 5 Investigations Limited | Extraterritorial | 2010 |
| Mike India 5 Ltd. | Administrative & support | 1994 |
| Mike Stewart Sound Limited | Manufacturing | 2023 |
| Mikeanics Limited | Wholesale & retail | 2007 |
| Mildmay Farm Limited | Agriculture & fishing | 2022 |
| Mill Street Ventures Ltd | Real estate | 2026 |
| Millington Limited | Professional & scientific | 2020 |