| M.Perry Auto Services Limited | Wholesale & retail | 2025 |
| M1 & K Barber Limited | Other services | 2018 |
| Maarte Ltd | Wholesale & retail | 2020 |
| MAC Properties Group Limited | Real estate | 2025 |
| Mackenzie Catering Limited | Hospitality | 2016 |
| MAD Dive School Limited | Education | 2020 |
| MAD Dive Shop Ltd | Wholesale & retail | 2023 |
| Madiha Taxi Limited | Transport & logistics | 2024 |
| Maguire Builders Limited | Construction | 2013 |
| Maine Amusements Limited | Arts & recreation | 1999 |
| Make a Splash Ltd | Arts & recreation | 2024 |
| Makinson Property Limited | Extraterritorial | 2012 |
| Malik Hand Carwash Limited | Administrative & support | 2024 |
| Mallard View Management Company Limited | Real estate | 2024 |
| Malta Limited | Hospitality | 2024 |
| Mamalala Ltd | Wholesale & retail | 2026 |
| Mandian Ltd | Administrative & support | 2013 |
| Manor Bay Escapes Ltd | Hospitality | 2021 |
| Mapp Estates (Morecambe) Limited | Real estate | 2014 |
| Marcel Logistics Limited | Transport & logistics | 2012 |
| Marine Capital Holdings Limited | Real estate | 2024 |
| Marine Road Investments Limited | Real estate | 2013 |
| Marine Road Property Ltd | Real estate | 2021 |
| Marine View (Morecambe) Limited | Hospitality | 2010 |
| Marineland Restaurant (Morecambe) Limited | Hospitality | 1975 |
| Marju Creations Limited | Health & social care | 2014 |
| Mark Houghton Building Contractors Ltd | Construction | 2016 |
| Mark Jolleys Limited | Administrative & support | 2023 |
| Mark Whiteside Joinery Ltd | Construction | 2016 |
| Married Digital Limited | Information & communication | 2022 |
| Marsh's Sass Limited | Extraterritorial | 1971 |
| Martin Landscaping Services Limited | Administrative & support | 2023 |
| Mary Property Limited | Real estate | 2022 |
| Mary Retail Ltd | Wholesale & retail | 2019 |
| Marz Property Ltd | Real estate | 2026 |
| Mashaw Properties Limited | Real estate | 2024 |
| Masons Resin Driveways Limited | Extraterritorial | 2020 |
| Mass Games Ltd | Information & communication | 2025 |
| Mastrpart Limited | Wholesale & retail | 2010 |
| Matrix Archaeology Limited | Professional & scientific | 2002 |
| Matrix Metering Ltd | Real estate | 1987 |
| Matt Bowen Films Limited | Information & communication | 2009 |
| Maxine Kenny Ltd | Arts & recreation | 2016 |
| Maxly Limited | Real estate | 2025 |
| Mayfield Avenue 1970 Limited | Extraterritorial | 2014 |
| Mayne Properties Ltd | Real estate | 2026 |
| MB Escapes LLP | | 2024 |
| MB Woodcraft Limited | Construction | 2012 |
| MBB Electrical Limited | Construction | 2016 |
| MCC Heating Services Ltd | Administrative & support | 2011 |
| Mcclure Group Ltd | Wholesale & retail | 2025 |
| Mcdaid Group (NW) Ltd | Construction | 2019 |
| Mdfisher Ltd | Transport & logistics | 2024 |
| MDG Hospitality Ltd | Arts & recreation | 2023 |
| Mdolls Beauty Ltd | Other services | 2025 |
| ME to YOU Care (North West) Limited | Health & social care | 2021 |
| Meadow Park Limited | Hospitality | 2001 |
| Media Sauce Solutions Limited | Information & communication | 2013 |
| Medical Filtration Solutions Limited | Manufacturing | 2013 |
| Meet the Makers Collective CIC | Arts & recreation | 2023 |
| Megasun 139 Limited | Other services | 2020 |
| Mehroz Limited | Wholesale & retail | 2019 |
| Melozohair Limited | Other services | 2025 |
| Mental Capacity Ltd | Education | 2021 |
| Mercer Compliance Ltd | Construction | 2018 |
| Merchant Software Solutions Limited | Information & communication | 2022 |
| Mercury Transport Ltd | Transport & logistics | 2025 |
| Merriman-Geen Limited | Real estate | 2024 |
| Meta Tax Limited | Professional & scientific | 2017 |
| Meters UK Ltd | Manufacturing | 2002 |
| MI 1 Ltd | Hospitality | 2010 |
| MIA Construction NW Ltd | Construction | 2021 |
| Michael GD Limited | Health & social care | 2022 |
| Michael Newton Limited | Arts & recreation | 2006 |
| Michael O'Connor Testing Limited | Wholesale & retail | 2014 |
| Middleton Holiday Park Limited | Hospitality | 2020 |
| Middleton Towers Holiday Park Ltd | Hospitality | 2017 |
| Millers Auto Plant and Fabrication Services Limited | Manufacturing | 2014 |
| Milli Developments Limited | Real estate | 2001 |
| Mind and Body Fit Limited | Health & social care | 2017 |
| Mindmapfocus Ltd | Health & social care | 2025 |
| MJ Crafts Ltd | Manufacturing | 2025 |
| MJ Estate Management Ltd | Construction | 2019 |
| MJA Health Care Limited | Health & social care | 2019 |
| Mobility Connect Ltd | Wholesale & retail | 2011 |
| Modern Green Joinery & Building Ltd | Construction | 2023 |
| Modified Strongman Training Systems Ltd | Information & communication | 2024 |
| Moneyclose Residents Limited | Real estate | 1990 |
| Moonsprint Ltd. | Real estate | 2011 |
| Moor Lane Services Ltd | Real estate | 2024 |
| Moorcroft & Maskrey Photography Ltd | Professional & scientific | 2024 |
| Moorlane Airsoft Ltd | Wholesale & retail | 2022 |
| Moral Care Ltd | Health & social care | 2021 |
| Morcambe Mini Market Limited | Wholesale & retail | 2026 |
| More Music in Morecambe | Arts & recreation | 2001 |
| Morecambe & Heysham Masonic Hall Company Limited | Other services | 1945 |
| Morecambe Bay Catering Ltd | Hospitality | 2025 |
| Morecambe Bay Chowder Co Limited | Manufacturing | 2020 |
| Morecambe Bay Discount Store Ltd | Other services | 2019 |
| Morecambe Bay Equestrian Centre C.I.C. | Education | 2022 |