| MG Matrix Ltd | Professional & scientific | 2011 |
| Mgcj Ltd | Wholesale & retail | 2025 |
| MH Medical Services Ltd | Health & social care | 2023 |
| MHM Security Ltd | Wholesale & retail | 2026 |
| MIA Flowers Ltd | Wholesale & retail | 2026 |
| Michael Breen and Sons Construction Limited | Construction | 2014 |
| Michael L Smith Ltd | Transport & logistics | 2015 |
| Micker Brook Ltd | Professional & scientific | 2024 |
| Midas Heating Services Ltd | Construction | 2024 |
| Midrobe Housing Ltd | Construction | 2010 |
| Mikosons Ltd | Wholesale & retail | 2024 |
| Milan Barber Limited | Other services | 2025 |
| Milano Hairdress Ltd | Other services | 2025 |
| Milkdogg Productions Limited | Arts & recreation | 2021 |
| Mill Town Kitchens & Interiors Limited | Wholesale & retail | 2017 |
| Millson (Holdings) Limited | Financial services | 2011 |
| Millson Group Limited | Professional & scientific | 1987 |
| MILNERTON22! Ltd | Transport & logistics | 2026 |
| Miners Arms AUL Ltd | Hospitality | 2019 |
| Mini Messy's Holiday Camps Ltd | Education | 2024 |
| Minibuses Ltd | Transport & logistics | 2012 |
| Minifab Ltd | Manufacturing | 2023 |
| Minnock Holding Limited | Financial services | 2018 |
| Miranoo Limited | Wholesale & retail | 2025 |
| Mirfin Building & Groundwork Limited | Construction | 2014 |
| MIRHASTORE2 Limited | Information & communication | 2024 |
| Miss Trendy Ltd | Wholesale & retail | 2023 |
| Mister Consultant Ltd | Information & communication | 2020 |
| Mistry Associates Limited | Professional & scientific | 2013 |
| MJ Logisitcs Limited | Transport & logistics | 2021 |
| MJ Projects & Consultancy Limited | Professional & scientific | 2023 |
| MJA Legacy Ltd | Wholesale & retail | 2026 |
| Mjaw Holdings Ltd | Health & social care | 2023 |
| MJL Finance Consulting Limited | Professional & scientific | 2026 |
| MJL Property Ltd | Real estate | 2017 |
| MJR Consultancy Services Limited | Professional & scientific | 2025 |
| MK Aerospace Ltd | Manufacturing | 2024 |
| MKH17 Ltd | Professional & scientific | 2021 |
| MM Holdings (North West) Limited | Real estate | 2020 |
| MM Race Team Ltd | Education | 2019 |
| MMA Food Ltd | Hospitality | 2024 |
| MMA Matting Ltd | Extraterritorial | 2013 |
| MMG Carpenters Ltd | Construction | 2021 |
| MMI Europe Limited | Professional & scientific | 2011 |
| MMR Installations Ltd | Information & communication | 2020 |
| MO Entertainemnts Limited | Hospitality | 2025 |
| Mobh Investments UK Ltd | Hospitality | 2017 |
| Mockridge Nursery Ltd | Wholesale & retail | 2005 |
| Moda Luxe Ltd | Wholesale & retail | 2021 |
| Modern Trend Carpet and Flooring Limited | Construction | 2026 |
| Modex Appliances Ltd | Wholesale & retail | 2022 |
| Moelund Ltd | Wholesale & retail | 2025 |
| Moffatt Advanced Sites Limited | Construction | 2025 |
| Mois Faster Services Limited | Construction | 2024 |
| Moloko Ventures Ltd | Professional & scientific | 2026 |
| Momentzbyfk Limited | Administrative & support | 2026 |
| Momini Ltd | Extraterritorial | 2014 |
| Moncho Ltd | Wholesale & retail | 2025 |
| Monobotics Ltd | Wholesale & retail | 2020 |
| Monopoly Events Ltd | Administrative & support | 2021 |
| Monopoly Properties (NW) Ltd | Real estate | 2017 |
| Monopoly Studios Hire Ltd | Administrative & support | 2025 |
| Monopoly Studios Ltd | Administrative & support | 2024 |
| Montserrat Capital Advisors Limited | Professional & scientific | 2012 |
| Moon Snow Ltd | Wholesale & retail | 2022 |
| Moonshinez Ltd | Wholesale & retail | 2024 |
| Moorerj Ltd | Hospitality | 2025 |
| Moorlea Medical Ltd | Health & social care | 2023 |
| Morevans Ltd | Transport & logistics | 2023 |
| Morningside Livery Stables Limited | Agriculture & fishing | 2023 |
| Morrell Residential Properties Ltd | Real estate | 2025 |
| Morris Public Houses Limited | Hospitality | 2024 |
| Mortgage Connections UK Ltd | Financial services | 2004 |
| Mosk Ltd | Wholesale & retail | 2025 |
| Moss & Williamson Limited | Professional & scientific | 2005 |
| Moss Engineering ( UK ) Limited | Manufacturing | 2006 |
| Moss Leopard Ltd | Hospitality | 2026 |
| Mossley AFC Limited | Arts & recreation | 1994 |
| Mossley Energy CIC | Energy | 2025 |
| Mossley Physio Limited | Other services | 2026 |
| Mossley PUB Co Ltd | Hospitality | 2020 |
| Mossley Spice Ltd | Hospitality | 2025 |
| Mossley Valeting Manchester Ltd | Administrative & support | 2026 |
| Motita & Sons Ltd | Wholesale & retail | 2023 |
| Motorcycle Spares NW Limited | Wholesale & retail | 2016 |
| Motorflow Cars Ltd | Wholesale & retail | 2025 |
| Moza Architecture Ltd | Professional & scientific | 2025 |
| Mplm Properties Ltd | Real estate | 2023 |
| MR Finch & Skin Ltd | Other services | 2018 |
| MR Pink Ltd | Information & communication | 2023 |
| MR Vape and Bakes Ltd | Wholesale & retail | 2024 |
| MRU UK Limited | Wholesale & retail | 2023 |
| Msalar Ltd | Other services | 2025 |
| MSH Secure Couriers Limited | Transport & logistics | 2013 |
| Msningcare Ltd | Health & social care | 2022 |
| Msww Properties Ltd | Real estate | 2001 |
| MT Delivery Service Ltd | Administrative & support | 2016 |
| MTT Couture Ltd | Wholesale & retail | 2025 |
| Muhammad Rayaan Ltd | Wholesale & retail | 2025 |
| Muli Motor Ltd | Wholesale & retail | 2024 |