| Mike Jackson Limited | Professional & scientific | 2002 |
| Mikzay Ltd | Wholesale & retail | 2024 |
| Milart Limited | Real estate | 1972 |
| Millennium Translations Ltd | Professional & scientific | 1999 |
| Miller Roskell Limited | Professional & scientific | 2007 |
| Millicans Optical Ltd | Wholesale & retail | 2016 |
| Milnshaw Limited | Professional & scientific | 2000 |
| Milo Books Limited | Information & communication | 2001 |
| Mimi (NW) Limited | Health & social care | 2019 |
| Mini Sport Limited | Wholesale & retail | 1980 |
| Minterr Limited | Wholesale & retail | 2025 |
| Mipd Limited | Real estate | 2007 |
| Mirage Landscapes Ltd | Administrative & support | 2014 |
| Mizville Ltd | Extraterritorial | 2007 |
| MJ Fabrications Limited | Construction | 2001 |
| MJ Fell Ltd | Agriculture & fishing | 2007 |
| MJ Scaffolding (North West) Limited | Construction | 2007 |
| MJA Matchpoint Limited | Professional & scientific | 2007 |
| MJC Electrical Services Limited | Construction | 1995 |
| MKC Groundwork Limited | Construction | 2001 |
| Mmpdbh Limited | Wholesale & retail | 2021 |
| Mobel Technic Limited | Water & waste | 1981 |
| Mobility Linx Limited | Health & social care | 2007 |
| Modernpower Limited | Information & communication | 1999 |
| Modular Ceilings and Interiors Limited | Construction | 2007 |
| Mogl Consulting Limited | Information & communication | 2006 |
| Moiz Exclusive Ltd | Wholesale & retail | 2025 |
| Monroe's (Blackburn) Limited | | 1986 |
| Moore and Smalley C.A. Limited | Professional & scientific | 2005 |
| Moorgate Kitchens Ltd | Wholesale & retail | 2001 |
| Morans Optical Ltd | Health & social care | 2015 |
| Mordane Developments Limited | Professional & scientific | 1987 |
| Morecambe Health Foods Limited | Wholesale & retail | 2002 |
| Morecambe NET Limited | Information & communication | 2003 |
| Morphonics Ltd. | Professional & scientific | 1998 |
| Morris Reeves Ltd | Wholesale & retail | 2025 |
| Moss Brook Service & Repairs Limited | Wholesale & retail | 2003 |
| Mossmere Ltd | Extraterritorial | 2000 |
| Mother and Child Globalcare | Health & social care | 2008 |
| Motor Clinic (Stalybridge) Limited | Wholesale & retail | 2003 |
| Mowitt Limited | Other services | 2002 |
| Moyna School of Motoring Limited | Education | 2006 |
| MP Translations Limited | Professional & scientific | 2004 |
| MRV (General Partner NE Accelerate) Limited | Financial services | 2025 |
| MSS Holdings (UK) Limited | Other services | 1992 |
| MST (Fylde) Limited | Real estate | 1993 |
| MTK Super Store Ltd | Wholesale & retail | 2025 |
| Mulberry Park Management Company Number 2 Limited | Professional & scientific | 1988 |
| Multibasics Limited | Construction | 2000 |
| Multiflex (2000) Limited | Administrative & support | 1972 |
| Multiform Projects Limited | Administrative & support | 2006 |
| Multyclean Limited | Administrative & support | 2004 |
| Mums Kitchen Limited | Hospitality | 2025 |
| Munshi Investments Limited | Real estate | 2002 |
| Murphy Mode Ltd | Wholesale & retail | 2026 |
| Muslim Global Relief | Water & waste | 2000 |
| Must Wines Limited | Wholesale & retail | 2000 |
| Mwlfs Limited | Financial services | 2007 |
| My Town Tiggers Community Interest Company | Health & social care | 2007 |
| Mymast Ltd | Manufacturing | 2007 |
| N J Hair Company Limited | Other services | 2003 |
| N S Lowe (Electrical Contractors) Limited | Construction | 2004 |
| N&S Fresh Ltd | Hospitality | 2007 |
| N. S. Properties (North West) Limited | Real estate | 2003 |
| N. Salisbury Limited | Construction | 2005 |
| N.C. Electrical Controls Limited | Construction | 2007 |
| N.I.S. Limited | Manufacturing | 1997 |
| N.J.G. Halal Slaughtering Limited | Professional & scientific | 2004 |
| N.S. Heating Services Limited | Construction | 2002 |
| Nama Limited | Professional & scientific | 2000 |
| Nameplate Services Limited | Administrative & support | 2001 |
| Napthens LLP | | 2007 |
| Nash Pharmacy Limited | Wholesale & retail | 1988 |
| Nathan & Co (Jewellery) Limited | Professional & scientific | 1999 |
| Nationwide Ground Rents Ltd | Real estate | 2003 |
| Natland Caravan Park Ltd | Hospitality | 2025 |
| Natural Choice Health Shop Limited | Wholesale & retail | 2003 |
| Nazene Danielle Ltd | Education | 2019 |
| NCC Consultancy Limited | Information & communication | 1995 |
| NDC Construction Management Co. | | 2000 |
| Nectrus Ltd | Administrative & support | 2017 |
| Neenah Red Bridge International Limited | Manufacturing | 2000 |
| Neil Dobson Kitchens Limited | Construction | 2006 |
| Neil Reid Consultancy Limited | Professional & scientific | 2007 |
| Neil Wilson Limited | Health & social care | 2006 |
| Nelson Computer Services Limited | Information & communication | 2003 |
| Nelson Healthcare Services Ltd | Health & social care | 2019 |
| Nelson Personal Travel Consultants Ltd | Administrative & support | 2024 |
| Nelson Quality Welders Limited | Manufacturing | 2004 |
| Nestlings Limited | Financial services | 2023 |
| Netaerial.Com Limited | Information & communication | 2004 |
| Netopsy Limited | Information & communication | 2000 |
| Netrascope Limited | Information & communication | 2000 |
| Network Connect Limited | Information & communication | 1992 |
| Network Installation Solutions Limited | Information & communication | 1999 |
| New City Scaffolding Limited | Construction | 2006 |
| New City Taxis Limited | Transport & logistics | 2004 |
| New Image Unisex Hair Design Limited | Other services | 2003 |
| New Mini Sport Limited | Extraterritorial | 2002 |
| New-Tech Properties Ltd | Administrative & support | 2005 |