| MM Building & Maintenance (NW) Ltd | Construction | 2019 |
| MM Building & Maintenance Ltd | Construction | 2018 |
| MM Commercial Cleaning Ltd | Administrative & support | 2017 |
| MM Financial Services Ltd | Financial services | 2024 |
| MM Trauma Cleaning Ltd | Administrative & support | 2017 |
| MME Consulting Ltd | Information & communication | 2014 |
| MMT Consult Ltd | Wholesale & retail | 2014 |
| Mnsp Limited | Real estate | 2020 |
| MO Rise Limited | Real estate | 2019 |
| Mobiliaid Ltd | Wholesale & retail | 2021 |
| Moccs Ltd | Professional & scientific | 2024 |
| Modern Bath Ware Co. Ltd | Wholesale & retail | 2019 |
| Modular Design and Construction Ltd | Construction | 2026 |
| Modus Motorsports Limited | Arts & recreation | 1998 |
| Mojo Group Limited | Professional & scientific | 2023 |
| Molly Darlington Ltd | Professional & scientific | 2019 |
| Molyssa Holdings Limited | Financial services | 2026 |
| Momentum (People Development) Ltd | Professional & scientific | 2014 |
| Momme Limited | Wholesale & retail | 2019 |
| Monarch Purchasing Limited | Professional & scientific | 2007 |
| Moneymaze Limited | Extraterritorial | 2003 |
| Monktondean Investments Limited | Real estate | 2009 |
| Montgomery Patrick Limited | Professional & scientific | 2024 |
| Moonquay Investments Limited | Administrative & support | 2023 |
| Moonquay Limited | Real estate | 2022 |
| Moore & Moore Care Limited | Health & social care | 2019 |
| Moore & Moore Invest Ltd | Households | 2023 |
| Moore & Moore Life Limited | Health & social care | 2003 |
| Moore & Moore Media Limited | Arts & recreation | 2022 |
| Moore Asset Finance Limited | Financial services | 2017 |
| Moore Repairs Limited | Real estate | 2003 |
| More Than a Hobby Ltd | Other services | 2005 |
| Morgan James Consulting Limited | Professional & scientific | 2015 |
| Moriarty MRI Services Limited | Health & social care | 2021 |
| Morris Managed Solutions Limited | Information & communication | 2019 |
| MORTGAGES4U(CHESHIRE) Limited | Financial services | 2020 |
| Moss Bodyshop Limited | Wholesale & retail | 2021 |
| Moss Contractors Ltd | Construction | 2025 |
| Moss Farm Community Services Limited | Hospitality | 2015 |
| Moss Law Limited | Professional & scientific | 2012 |
| Moss Naylor Young Limited | Professional & scientific | 2011 |
| Moss Property Group Limited | Real estate | 2019 |
| Moss Rose Developments Ltd | Construction | 2026 |
| Motorite (Northwich) Limited | Wholesale & retail | 1979 |
| Motoserv Limited | Wholesale & retail | 2006 |
| MPE Consultancy Services Limited | Construction | 2015 |
| MPI Electrical Limited | Construction | 2021 |
| Mploy Solutions Limited | Education | 2011 |
| MPR Catering Services Ltd | Wholesale & retail | 2025 |
| MR Autos Mobile Mechanic Ltd | Wholesale & retail | 2022 |
| MR Olivers Creative Ltd | Professional & scientific | 2019 |
| MRB Office Solutions Ltd | Administrative & support | 2014 |
| MRM Wines Ltd | Extraterritorial | 2013 |
| MRS Nursery Holdings Limited | Education | 2015 |
| MS Side Limited | Hospitality | 2025 |
| MTT Medical (PVT) Ltd | Health & social care | 2024 |
| Mukky Pups Ltd | Manufacturing | 2024 |
| Mulgrove Limited | Construction | 1976 |
| Multiplastics (Europe) Limited | Manufacturing | 1989 |
| Munch Box Indian Takeaway Ltd | Hospitality | 2025 |
| Munch Box Ltd | Hospitality | 2025 |
| Murray Corporate Financial Services Limited | Real estate | 2017 |
| Murray Smith Financial Services Limited | Financial services | 1988 |
| Murray Smith LLP | | 2005 |
| Muscle Gold Group Ltd | Hospitality | 2021 |
| Music Nest Northwich Limited | Real estate | 2024 |
| Mutualplace Property Management Limited | Households | 1995 |
| MV Electrical & Security Limited | Construction | 2010 |
| MWC Construction Consultants Ltd | Administrative & support | 2017 |
| MWM Consultants UK Holdings Limited | Financial services | 2023 |
| MWM Investors UK Limited | Financial services | 2025 |
| My Card Payments Limited | Other services | 2025 |
| My Construction - Windows and Doors Limited | Construction | 2024 |
| My Girl Friday Ltd | Administrative & support | 2023 |
| My Heatpro Ltd | Construction | 2024 |
| My MED Group Ltd | Wholesale & retail | 2020 |
| My Medcomms Ltd | Professional & scientific | 2025 |
| My Plantfix Ltd | Information & communication | 2025 |
| Mysonex Ltd | Real estate | 2001 |
| Myssion Ltd | Real estate | 2024 |
| Mywindsock Ltd | Information & communication | 2022 |
| MZ Cleaning Services Ltd | Administrative & support | 2023 |
| N & D Modelling Limited | Professional & scientific | 2010 |
| N E Entertainment Limited | Professional & scientific | 2012 |
| N S Matthews Limited | Transport & logistics | 2018 |
| N W Cars Ltd | Wholesale & retail | 2018 |
| N. U. Philips Ltd | Health & social care | 2013 |
| N.H. Associates (Cheshire) Limited | Professional & scientific | 2011 |
| N7 Services Limited | Administrative & support | 2024 |
| Nail Express 62 Ltd | Other services | 2026 |
| Nakawo Limited | Health & social care | 2015 |
| Nalco Acquisition One | Manufacturing | 2003 |
| Nalco Manufacturing Ltd | Manufacturing | 2010 |
| Nancarrow Plumbing & Heating Limited | Construction | 2006 |
| Nancy Meehan Social Work Consultancy Ltd | Health & social care | 2010 |
| Nanna Parrys Limited | Wholesale & retail | 2018 |
| Nantwich Estates Limited | Financial services | 2017 |
| Naomi Louise Scarves Limited | Manufacturing | 2017 |
| Narrowboats Ltd | Wholesale & retail | 2010 |
| NAT HGV Ltd | Transport & logistics | 2018 |