| Modulus Consultants Ltd | Professional & scientific | 2016 |
| MOF Houses Ltd | Real estate | 2025 |
| Mohammad Haroon Optical Services Ltd | Health & social care | 2025 |
| Mohammad Tariq Limited | Wholesale & retail | 2025 |
| Mohammed & Sons Ltd | Real estate | 2023 |
| Mohammed Alotumi Gold Trading Ltd | Other services | 2023 |
| Mohammed Waseem Ltd | Health & social care | 2007 |
| Moheblali Ltd | Wholesale & retail | 2023 |
| Mohini Properties Ltd | Real estate | 2019 |
| Moiza Builders Ltd | Construction | 2021 |
| Moka Consultants Ltd | Other services | 2024 |
| Mokus Trading Ltd. | Wholesale & retail | 2013 |
| Molloy Flooring Ltd | Construction | 2025 |
| Molnlycke Health Care Limited | Manufacturing | 1998 |
| Momentum Performance Ltd | Administrative & support | 2025 |
| Momentum Real Estate Ltd | Real estate | 2025 |
| Monan Motors Rent & Repair Limited | Administrative & support | 2024 |
| Monarch Developments (Royton) Ltd | Construction | 2021 |
| Monarch Metals Limited | Water & waste | 2005 |
| Monarch Metals Oldham Ltd | Water & waste | 2025 |
| Monarch Shelving Limited | Manufacturing | 2005 |
| Money Money Property Developer Ltd | Construction | 2025 |
| Money-Tek UK Services Ltd | Administrative & support | 2018 |
| Moneywizee Ltd | Information & communication | 2025 |
| Moni Investments Ltd | Information & communication | 2015 |
| Monir Ltd | Administrative & support | 2024 |
| Monitor My Solar Limited | Manufacturing | 2012 |
| Mono Colour Photography Ltd | Professional & scientific | 2010 |
| Mono Masonry Ltd | Construction | 2015 |
| Mono Restaurants (NO 1) Limited | Hospitality | 2016 |
| Monsoon Beddings Limited | Wholesale & retail | 2018 |
| Monster Event Staff Limited | Administrative & support | 2024 |
| Mont Hospitality Limited | Professional & scientific | 2020 |
| Montaguestexmexgsk Limited | Hospitality | 2018 |
| Montana INK Ltd | Wholesale & retail | 2025 |
| Montana Next Fried Chicken and Pizza Ltd | Hospitality | 2022 |
| Monty's Taxis Limited | Transport & logistics | 2003 |
| Moo's Bobs and Bits Ltd | Wholesale & retail | 2023 |
| Mood Hair and Beauty Studio Limited | Other services | 2025 |
| Moody Beauty Ltd | Administrative & support | 2016 |
| Moody Sheep Limited | Agriculture & fishing | 2012 |
| Moon Logestics Ltd | Transport & logistics | 2025 |
| Moon Star Academy Limited | Health & social care | 2025 |
| Mooney Developments Limited | | 1987 |
| Moonix Ltd | Wholesale & retail | 2024 |
| Moonleap Limited | Real estate | 1976 |
| Moonlight Seeds Ltd | Wholesale & retail | 2025 |
| Moor AV Services Ltd | Manufacturing | 2008 |
| Moore & SON Builders Ltd | Construction | 2012 |
| Moorgate PV Ltd | Construction | 2025 |
| Moorhey MCR Ltd | Administrative & support | 2023 |
| Moorhey Motors Ltd | Wholesale & retail | 2025 |
| Moorheys Limited | Administrative & support | 1996 |
| Moorlands Caravan & Camping Park Limited | Hospitality | 2011 |
| Moorlands Hargreaves Limited | Wholesale & retail | 2022 |
| Moorside C&Bc Community Interest Company | Hospitality | 2013 |
| Moorside Discount Store Limited | Wholesale & retail | 2024 |
| Moorside Garage (Oldham) Limited | Wholesale & retail | 2020 |
| Moorside Legal Services Limited | Administrative & support | 2023 |
| Moorside Sports Club Ltd | Arts & recreation | 2013 |
| Moorside Super Tyres Ltd | Manufacturing | 2025 |
| Moosprings Store Limited | Wholesale & retail | 2024 |
| Moprop Limited | Real estate | 2006 |
| Mora Asset Management and Investment Ltd | Professional & scientific | 2025 |
| More Money Ltd | Professional & scientific | 2021 |
| Moregrace Nannies Ltd | Health & social care | 2024 |
| Morgan & Morgan Brickwork Ltd | Administrative & support | 2015 |
| Morgan's Electrics (Stourbridge) Limited | Wholesale & retail | 2008 |
| Moriarty Memorials Manchester Ltd | Manufacturing | 2023 |
| Morley Street Developments Ltd | Construction | 2019 |
| Morningside Properties Ltd | Real estate | 2020 |
| Morrisso Health CIC | Other services | 2021 |
| Mortgages 4 U (North West) Limited | Administrative & support | 2003 |
| Mortgages TLC Limited | Financial services | 2002 |
| Mosaic Medical (NW) Limited | Financial services | 2023 |
| Mose 21 Ltd | Wholesale & retail | 2024 |
| Moses Property Investments Ltd | Real estate | 2018 |
| Moss Electrical Ltd | Construction | 2018 |
| Moss Investment Properties Ltd | Real estate | 2020 |
| Mossley Healthcare Limited | Wholesale & retail | 2023 |
| Mossley Vehicle Service Ltd | Wholesale & retail | 2021 |
| Moston (Rjpf) Limited | Arts & recreation | 2007 |
| Moston Vehicle Solutions Limited | Wholesale & retail | 2020 |
| Mother Hubbard's (Oldham) Ltd | Hospitality | 2018 |
| Mother's Love Child Care Ltd | Health & social care | 2026 |
| Motion Waste Management Limited | Water & waste | 2024 |
| Motomatch Limited | Wholesale & retail | 2026 |
| Motor Colours Limited | Wholesale & retail | 2010 |
| Motor Warehouse Ltd | Wholesale & retail | 2019 |
| Motoraid Manchester Limited | Administrative & support | 2023 |
| Motorists Discount Store Limited | Wholesale & retail | 2006 |
| Motown Crompton Cars Ltd | Transport & logistics | 2018 |
| MOU Properties Ltd | Real estate | 2016 |
| Moughal Corporation Ltd | Health & social care | 2010 |
| Moughal Holdings Ltd | Wholesale & retail | 2019 |
| Mould Specialists UK Limited | Water & waste | 2021 |
| Mount Pyramid Investment Ltd | Real estate | 2023 |
| Mountain Environmental Ltd | Professional & scientific | 2021 |
| Mountain Moorland Adventure Training Ltd | Education | 2024 |
| Movement Control Ltd | Transport & logistics | 2014 |