| Memrek Ltd | Manufacturing | 2000 |
| Menai Mews (Prescot) Ltd | Households | 1995 |
| Meridien Leisure Limited | Hospitality | 2003 |
| Mersey CAN Limited | Manufacturing | 1992 |
| Mersey Forge Ltd | Construction | 2007 |
| Mersey Investments Ltd | Construction | 2020 |
| Mersey Rewinds Limited | Manufacturing | 1979 |
| Merseyside Castings Co. Limited | Manufacturing | 2005 |
| Merseyside Domestic Appliances Ltd | Wholesale & retail | 2006 |
| Merseyside Equestrian Centre Limited | Arts & recreation | 2007 |
| Merseyside Home Aids (Discount Kitchen & Bathroom Centres) Limited | Transport & logistics | 1983 |
| Merseyside Precision Engineering (Knowsley) Limited | Manufacturing | 1977 |
| Metropolitan Cathedral Services Limited | Wholesale & retail | 1995 |
| Metwirral Limited | | 1953 |
| Michael Matthews Jewellery Limited | Wholesale & retail | 1999 |
| Mijas Villas Limited | Real estate | 2002 |
| Milecertain Limited | Health & social care | 1986 |
| Millville Properties Limited | Professional & scientific | 2003 |
| Milrho Limited | Hospitality | 1998 |
| MLZ Limited | Information & communication | 1998 |
| MMC (North West) Limited | Wholesale & retail | 2000 |
| Modeparfait Limited | Wholesale & retail | 2024 |
| Money Range Limited | Extraterritorial | 2014 |
| Monshea Limited | Wholesale & retail | 2011 |
| Morax Limited | Administrative & support | 2002 |
| Morcool Maintenance Limited | Construction | 2010 |
| Morrisons GRP Ltd | Manufacturing | 2004 |
| Morriss Instrumentation Consultancy Services (M.I.C.S.) Limited | Professional & scientific | 2005 |
| Moto Sport Services Limited | Wholesale & retail | 2002 |
| MP Estates Limited | Real estate | 2002 |
| MPE Interiors Limited | Manufacturing | 2001 |
| MR. Pickwick's of Liverpool Limited | Hospitality | 1972 |
| MT Mobile Barber Ltd | Other services | 2020 |
| Munro Summers Architects Ltd. | Professional & scientific | 2007 |
| Murphy and Bamber LLP | | 2006 |
| Muse Concept Limited | Arts & recreation | 2005 |
| N T C Building Contractors Limited | Construction | 2001 |
| N.J.D. Limited | Real estate | 1973 |
| N.L. Williams Group Limited | Manufacturing | 1973 |
| Nair-Marolia Healthcare Limited | Real estate | 2014 |
| Natalie ANN Brides Limited | Wholesale & retail | 2005 |
| Nation Holdings Ltd | Hospitality | 2026 |
| NDH Developments Ltd | Construction | 2007 |
| Ne-Matt Properties Ltd | Real estate | 2001 |
| Network Space Developments Limited | Real estate | 2024 |
| New Dawn Computers Ltd | Information & communication | 2009 |
| New Electrics Limited | Construction | 1999 |
| New Town Tyres Limited | Wholesale & retail | 2001 |
| Newjuice Limited | Administrative & support | 2013 |
| Newton Vehicle Services Limited | Wholesale & retail | 2003 |
| Next Step Children's Services Limited | Real estate | 2003 |
| Nextview Residents Management Limited | Hospitality | 1999 |
| Ngaa Locum Limited | Health & social care | 2007 |
| Nijman Zeetank International Transport Limited | Transport & logistics | 1990 |
| Njsr Chartered Architects LLP | | 2001 |
| NLP Liverpool Limited | Professional & scientific | 2002 |
| North Birkenhead Development Trust Limited | Real estate | 2004 |
| North Liverpool Primary Care Limited | Health & social care | 2026 |
| North West GAS Engines Ltd | Wholesale & retail | 2007 |
| North West Plant Hire & Sales Limited | Administrative & support | 1980 |
| North West Vending Limited | Wholesale & retail | 2001 |
| North Western Estates Development Limited | Real estate | 1928 |
| Northern Illustrated Print Limited | Manufacturing | 1991 |
| Northwest Financial | | 2007 |
| Nothing BUT Footprints Limited | Information & communication | 2006 |
| Notwork Network Limited | Information & communication | 2004 |
| NRG Kitchens Ltd | Construction | 2026 |
| NTG Decorators Limited | Construction | 2002 |
| Nubee Fashion Secrets Ltd | Administrative & support | 2015 |
| Nvyro Limited | Wholesale & retail | 2004 |
| NW Build (Liverpool) Limited | Administrative & support | 2016 |
| NW Properties North West Limited | Real estate | 2004 |
| OKO Medical Limited | Health & social care | 2019 |
| Onteca Limited | Information & communication | 2001 |
| Ontrack Electrical Limited | Construction | 2002 |
| Optoplast Limited | Extraterritorial | 1996 |
| Optoplast Manufacturing Company Limited(The) | Manufacturing | 1946 |
| ORD Facilities Limited | Extraterritorial | 2013 |
| Oriel Studios Digital Limited | Manufacturing | 2006 |
| Osborne Associates Limited | Professional & scientific | 2018 |
| Oxbuild Limited | | 1980 |
| P B M Management Limited | Real estate | 2003 |
| P. N. R. Telecoms Ltd | Information & communication | 2007 |
| P.J. Wilson Decorators Limited | Construction | 2003 |
| P.V. Williams (Sheet Metal) Limited | Manufacturing | 2003 |
| P2PM Limited | Professional & scientific | 2004 |
| PAB Properties Ltd | Real estate | 1996 |
| Pain Recovery Limited | Health & social care | 2020 |
| Panorama Furnishing Mart Limited | Manufacturing | 1982 |
| Panorama Furnishings Limited | Extraterritorial | 1997 |
| Paramount Automation Ltd | Professional & scientific | 2006 |
| Parent Point Ltd | Other services | 2017 |
| Park Card Services Limited | Financial services | 1996 |
| Park Christmas Savings Club Limited | Professional & scientific | 1971 |
| Park Connect Limited | Professional & scientific | 1990 |
| Park Direct Credit Limited | Professional & scientific | 1998 |
| Park Financial Services Limited | Financial services | 1997 |
| Park Food (Warrington) Limited | Professional & scientific | 1961 |
| Park Prepayments Trustee Company Limited | Professional & scientific | 2007 |
| Park Retail Limited | Administrative & support | 1945 |