| Lytham Wines and Spirits Ltd | Wholesale & retail | 2019 |
| M & J Heaton Properties Ltd | Real estate | 2019 |
| M BAK Consultancy Ltd | Professional & scientific | 2022 |
| M Brittain Consulting Ltd | Professional & scientific | 2019 |
| M Chadwick Investments Limited | Real estate | 2003 |
| M D Security Systems Limited | Construction | 2005 |
| M G Creative Media Limited | Professional & scientific | 2009 |
| M Hair Studio Limited | Other services | 2020 |
| M P Robinson Ltd | Construction | 2012 |
| M Stuart Property Ltd | Households | 2026 |
| M W Holdsworth Limited | Construction | 2017 |
| M&Mfm Limited | Professional & scientific | 2014 |
| M&Rhotel Limited | Hospitality | 2025 |
| M.D.C. Consulting Limited | Real estate | 2012 |
| M.M.Rowlands. Ltd | Construction | 2018 |
| M3 Technical Services Ltd | Professional & scientific | 2017 |
| M3ENG Ltd | Administrative & support | 2025 |
| M61 Properties Ltd | Real estate | 2024 |
| MA Legal Consulting Limited | Professional & scientific | 2022 |
| Mables ST Annes Limited | Hospitality | 2025 |
| MAC Clinical Research Finance Ltd | Health & social care | 2015 |
| MAC Clinical Research Ltd | Professional & scientific | 2015 |
| MAC Research Ltd | Health & social care | 2011 |
| Macca Holdings Ltd | Hospitality | 2022 |
| Maceland Windows & Doors Systems Limited | Wholesale & retail | 2002 |
| Macfarlane Canine Services Limited | Other services | 2019 |
| Machinepulse Limited | Information & communication | 2003 |
| Macros Health Bar Blackpool Ltd | Hospitality | 2019 |
| Macros Meal Prep Blackpool Ltd | Hospitality | 2019 |
| MAD Property Renovations Limited | Construction | 2021 |
| Maddison Paige Hair Extensions Ltd | Other services | 2023 |
| Madison Heights Management Company Limited | Households | 2003 |
| Magculture Limited | Professional & scientific | 2013 |
| Magic Loop Ltd | Wholesale & retail | 2021 |
| Magma Bell Limited | Professional & scientific | 2023 |
| Magnetic Homes Limited | Real estate | 2023 |
| Magnetic Rooms Limited | Real estate | 2023 |
| Maintenance for Hotels Ltd | Construction | 2021 |
| Mairs Media Ltd | Information & communication | 2025 |
| Maison Sophie Limited | Other services | 2024 |
| Make U Safe - National Security Am&Rs Ltd | Administrative & support | 2019 |
| Making Money Simple Ltd | Education | 2020 |
| Malison Property Limited | Real estate | 2019 |
| Mallee Developments Limited | Real estate | 2015 |
| Mama Cuffe's Catering Limited | Hospitality | 2017 |
| Mamma GINA25 Ltd | Hospitality | 2025 |
| MAN Down Packages Ltd | Wholesale & retail | 2022 |
| Manchester Manufacturing Limited | Financial services | 2021 |
| Mango Food Hub Limited | Hospitality | 2025 |
| Mannikaran Restaurants Ltd | Hospitality | 2025 |
| Manor Engineering Services Ltd | Other services | 2026 |
| Maple Data Solutions Ltd | Information & communication | 2018 |
| Maple Holdings Ltd | Real estate | 2015 |
| Marcel's Pro Racing TT Team Ltd | Other services | 2022 |
| Marcella's Ltd | Manufacturing | 2025 |
| Marchil Apartments Ltd | Real estate | 2020 |
| Marcold Developments Limited | Extraterritorial | 2006 |
| Marcold Holdings Limited | Professional & scientific | 2014 |
| Marcstelecoms Ltd | Professional & scientific | 2016 |
| Mariners Quay Management Company Limited | Households | 1998 |
| Mark Cracknell Limited | Health & social care | 2010 |
| Mark Macpherson Properties Limited | Real estate | 2022 |
| Marketsquare Estates Ltd | Construction | 2005 |
| Markfield Farm Ltd | Agriculture & fishing | 2026 |
| Mary Poppins Nursery Fylde Limited | Education | 2002 |
| Masco Properties Limited | Real estate | 2009 |
| Masonry Shield Products Limited | Manufacturing | 2022 |
| Mast Consultancy Ltd | Professional & scientific | 2021 |
| Matheson Bowley Properties Ltd | Real estate | 2025 |
| Mathies Financial Ltd | Professional & scientific | 2013 |
| Matosa Services Ltd | Other services | 2025 |
| Matt FOX Bathrooms Limited | Construction | 2021 |
| Matthew Holyoak Seminars Ltd | Health & social care | 2019 |
| Matthew Seed Photography Limited | Information & communication | 2012 |
| Maun Consulting Limited | Professional & scientific | 2011 |
| Maun Estates Limited | Real estate | 2025 |
| MAV & Annie's Ltd | Wholesale & retail | 2025 |
| Maverick Racing Ltd | Arts & recreation | 2023 |
| Mayes Rail Retail Advisory Service Limited | Transport & logistics | 2025 |
| Mayfield Distribution Ltd | Transport & logistics | 2021 |
| MBC Advisory Services Ltd | Other services | 2021 |
| MCC Restaurants Limited | Extraterritorial | 2021 |
| Mccavery Pet Supplies Ltd | Wholesale & retail | 2018 |
| Mcci Ltd | Hospitality | 2024 |
| Mclaren Ventures Ltd | Wholesale & retail | 2021 |
| Mcmillan Property Lettings Ltd | Real estate | 2022 |
| MDK Consulting Ltd | Professional & scientific | 2025 |
| ME Property Ventures Ltd | Real estate | 2020 |
| Me&U Catering Ltd | Hospitality | 2019 |
| Meadow Croft Property Management Company Limited | Real estate | 1989 |
| Mec-Tec Ltd | Wholesale & retail | 2017 |
| Medella Sanare Ltd | Wholesale & retail | 2021 |
| Media Bureau Limited | Professional & scientific | 2018 |
| Mediaprint Solutions Ltd | Manufacturing | 2005 |
| Mediawah Ltd | Information & communication | 2025 |
| Medikaz Limited | Health & social care | 2019 |
| Medlar Gate Management Company Limited | Households | 1978 |
| Melling Performance Springs Ltd | Manufacturing | 2020 |
| Melton Grove Management Company Limited | Households | 2025 |
| Mema Group Ltd | Extraterritorial | 2024 |