| Marquis Fine Homes Ltd | Construction | 2006 |
| Marris Services Limited | Transport & logistics | 2008 |
| Mars Bar & PUB Ltd | Hospitality | 2026 |
| Mars Facilities Management Ltd | Real estate | 2026 |
| Mars Hotels & Resorts Ltd | Real estate | 2023 |
| Mars Massage & Spa - Blackpool Ltd | Professional & scientific | 2024 |
| Mars Restaurant Blackpool Ltd | Hospitality | 2026 |
| Marsden Washrooms Limited | Manufacturing | 2020 |
| Marstock Homes Ltd | Health & social care | 2025 |
| Martable Solutions Ltd | Wholesale & retail | 2024 |
| Martin Brown Paints Limited | Wholesale & retail | 1961 |
| Martin Elec Ltd | Energy | 2015 |
| Martin Harris Consultancy Limited | Wholesale & retail | 2015 |
| Martin Spencer Architecture LLP | | 2017 |
| Marton Managment Ltd | Hospitality | 2024 |
| Marton Meats Ltd | Extraterritorial | 2015 |
| Marton Property Care Ltd | Administrative & support | 2013 |
| Marton Rock Limited | Manufacturing | 2009 |
| Martyn Rowe Consultancy Ltd | Information & communication | 2015 |
| Martys Workshop Limited | Other services | 2025 |
| Mary Glassbrook Limited | Professional & scientific | 2012 |
| MAS Lettings & Management Limited | Households | 2022 |
| MAS Vehicle Maintenance Ltd | Wholesale & retail | 2022 |
| Masala Blackpool Ltd | Hospitality | 2024 |
| Mascarada Limited | Arts & recreation | 2025 |
| Masefield Close (Block 1) RTM Company Limited | Households | 2022 |
| Mashud QA Solutions Ltd | Information & communication | 2017 |
| Maslow Services Ltd | Information & communication | 2019 |
| Masonic Catering Ltd | Hospitality | 2022 |
| Masonic Event Catering Limited | Hospitality | 2021 |
| Mass Acoustic Limited | Administrative & support | 2003 |
| Massawa Studio Ltd | Other services | 2014 |
| Massey Hospitality Ltd | Hospitality | 2026 |
| Massey Property Holdings Limited | Real estate | 2018 |
| Massive Competitions Ltd | Wholesale & retail | 2021 |
| Mastercraft Upholstery Ltd. | Manufacturing | 2000 |
| Maston Tracks Ltd | Wholesale & retail | 2025 |
| MAT Booth Ltd | Information & communication | 2021 |
| Matchiqanalysis Ltd | Arts & recreation | 2026 |
| Matea Property Ltd | Information & communication | 2013 |
| Matlock Howard Ltd | Wholesale & retail | 2025 |
| Matphil Convenience Limited | Wholesale & retail | 2017 |
| Matrix Invest Ltd | Wholesale & retail | 2022 |
| Matt Connell and SON Ltd | Construction | 2025 |
| Matthew Clark Electrical Ltd | Construction | 2026 |
| Matthew Consulting Limited | Professional & scientific | 2016 |
| Matthew Peel Ltd | Information & communication | 2018 |
| Matthew Shaw Roofing Limited | Administrative & support | 2017 |
| Matthew Spade Digital Ltd | Professional & scientific | 2025 |
| Matthewrsalmon Limited | Professional & scientific | 2026 |
| Maureen Moore Limited | Health & social care | 2007 |
| Mavex Ltd | Wholesale & retail | 2025 |
| MAW Property Holdings Ltd | Real estate | 2023 |
| MAX Carlyle Ltd | Manufacturing | 2003 |
| MAX Cybersecurity Ltd | Information & communication | 2025 |
| MAX Opps BD Ltd | Professional & scientific | 2020 |
| MAX Plates UK Ltd | Other services | 2025 |
| Maxgain Holdings Limited | Information & communication | 2009 |
| Maxine's Feathers UK Limited | Manufacturing | 2015 |
| Maxman Landscaping Limited | Administrative & support | 2020 |
| Maxwell Fuels Ltd | Wholesale & retail | 2025 |
| Maxwell Grimes Ltd | Wholesale & retail | 2025 |
| Mayank Technologies Limited | Information & communication | 2015 |
| Mayfair Properties Blackpool Ltd. | Real estate | 2021 |
| MBA Aviation Consulting Ltd | Professional & scientific | 2025 |
| MC Safeguarding Solutions Ltd | Other services | 2016 |
| MC Tippers & Grabs Ltd | Transport & logistics | 2025 |
| MC3 Conseils Limited | Professional & scientific | 2012 |
| Mcauley Xamd Holdings Ltd | Information & communication | 2025 |
| Mcculloch Oils Ltd | Wholesale & retail | 2025 |
| Mcdj Group Limited | Households | 2026 |
| Mcdonald Developments Limited | Real estate | 2003 |
| Mcelligott Building Ltd | Construction | 2008 |
| MCG Property Investment Ltd | Real estate | 2021 |
| Mcgrath Leisure Ltd | Hospitality | 2023 |
| MCH Management Ltd | Real estate | 2026 |
| Mchalls Accommodation Limited | Hospitality | 2022 |
| Mckissack Property Solutions Ltd | Households | 2024 |
| Mcmaster Yachts Limited | Administrative & support | 2008 |
| Mcnamee Developments Ltd | Construction | 2014 |
| Mcneill Portman Holdings Ltd | Real estate | 2020 |
| Mcphee Property Limited | Real estate | 2023 |
| Mcreynolds Universal Sports Tech Ltd | Wholesale & retail | 2023 |
| Mcswan Ltd | Information & communication | 2014 |
| Mcwaltons Estates Ltd | Real estate | 2025 |
| MD Health Ltd | Health & social care | 2023 |
| MD Hemsley Ltd | Information & communication | 2022 |
| MDA Services Limited | Professional & scientific | 2025 |
| Mdfitout Limited | Construction | 2014 |
| MDI Limited | Wholesale & retail | 1993 |
| Mdtweaks Limited | Wholesale & retail | 2020 |
| MDW Builders Ltd | Construction | 2025 |
| Mead Midco Limited | Financial services | 2024 |
| Meadow Funeral Directors Ltd | Other services | 2019 |
| Meadow Green Cattery Limited | Other services | 2025 |
| Meadowbank Property Developments Ltd | Other services | 2019 |
| Meadowcroft Plastering Ltd | Construction | 2026 |
| Meadowlands (Property Holdings) Limited | Real estate | 2016 |
| Meakin Logistics (UK) Ltd | Wholesale & retail | 2011 |
| Meat and Plaice Limited | Hospitality | 2025 |