| Mental Capacity Cat Ltd | Professional & scientific | 2019 |
| Merchant's Funding Limited | Financial services | 2013 |
| Merchants LAB Ltd | Wholesale & retail | 2026 |
| Mercury Investments (UK) Limited | Administrative & support | 1994 |
| Mersey Builders Ltd | Construction | 2023 |
| Mersey Enterprises Ltd | Wholesale & retail | 2025 |
| Mersey Equipment Company Limited | Wholesale & retail | 1974 |
| Mersey Groundwork Ltd | Extraterritorial | 2020 |
| Mersey Joinery Interiors Limited | Construction | 2021 |
| Mersey Joinery Limited | Construction | 2004 |
| Mersey Residential & Plant Limited | Real estate | 2020 |
| Mersey Spring CIC | Hospitality | 2013 |
| Mersey Timber Limited | Wholesale & retail | 1984 |
| Merseyfix Drylining Ltd | Construction | 2025 |
| Merseynest Property Services Ltd | Households | 2026 |
| Merseyside Automotive Centres Limited | Wholesale & retail | 1967 |
| Merseyside Care Limited | Administrative & support | 2007 |
| Merseyside Homes Limited | Real estate | 2024 |
| Merseyside Investments Limited | Real estate | 2004 |
| Merseyside Nighthawks Ltd | Arts & recreation | 2022 |
| Merseyside Pipeline Supplies Limited | Wholesale & retail | 1992 |
| Merseyside Plumbing & Maintenance Ltd | Construction | 2022 |
| Merseyside Salvage Ltd | Water & waste | 2024 |
| Merseyside Send Partnership Limited | Education | 2024 |
| Merton Grove Autos Limited | Wholesale & retail | 2023 |
| MF Property Group Ltd | Real estate | 2026 |
| MG Spencer Properties Ltd | Real estate | 2025 |
| Middleton Care Services Ltd | Administrative & support | 2023 |
| Midfield Construction Ltd | Construction | 2024 |
| Mike Mini Market Bootle Ltd | Wholesale & retail | 2026 |
| Mike Store Knowsley Road Ltd | Wholesale & retail | 2025 |
| Mike's Convenience Store Liverpool Ltd | Wholesale & retail | 2025 |
| Mina Enterprises Ltd | Professional & scientific | 2024 |
| Mind Body Soul CIC | Health & social care | 2025 |
| Mini CAB Taxi Limited | Transport & logistics | 2019 |
| Mini Moments (Toddler Sensory) Limited | Education | 2023 |
| Mini Moments Party Limited | Health & social care | 2023 |
| Mirwais Farahi Consultancy Ltd | Professional & scientific | 2023 |
| MJ & MS Limited | Wholesale & retail | 1999 |
| MJG Rail Joinery Ltd | Construction | 2018 |
| MJK Developments NW Ltd | Construction | 2019 |
| MJT Residential Ltd | Real estate | 2026 |
| MLH Academy CIC | Education | 2024 |
| MLJ1 Limited | Transport & logistics | 2025 |
| Mllo Plastering and Restorations Ltd | Construction | 2026 |
| MLM Property Ventures Limited | Real estate | 2024 |
| Mnmf Ltd | Real estate | 2024 |
| Modus Quantity Surveying Ltd | Professional & scientific | 2015 |
| Moland Food Ltd | Hospitality | 2025 |
| Molly Mo's Limited | Hospitality | 2019 |
| Moonlight Healthcare Limited | Health & social care | 2016 |
| Moonshine Eyewear Ltd | Wholesale & retail | 2016 |
| Moorfields Health (Liverpool) Limited | Health & social care | 2016 |
| Moorfields Health LLP | | 2011 |
| Morsli Steering Ltd | Manufacturing | 2022 |
| Moss Vending Solutions Ltd | Wholesale & retail | 2025 |
| Mother Dough Culinary Ltd | Education | 2021 |
| Moto Ripperz Ltd | Wholesale & retail | 2024 |
| Motor FIX Solutions Ltd | Wholesale & retail | 2024 |
| Motor FIX Taxis Ltd | Transport & logistics | 2025 |
| Motor Outlet Limited | Wholesale & retail | 2008 |
| Mountbatton Care Ltd | Health & social care | 2012 |
| Mountbatton Holdings Ltd | Financial services | 2025 |
| Move Sure Limited | Professional & scientific | 2016 |
| Move-It-On Ltd | Real estate | 2025 |
| MR Bling Venue Dressing Ltd | Hospitality | 2025 |
| MR Chips Food Limited | Hospitality | 2021 |
| MR Exec Travel Ltd | Transport & logistics | 2019 |
| MRB Prime Ltd | Wholesale & retail | 2026 |
| MS Motor Sales Ltd | Wholesale & retail | 2025 |
| MT Autos (NW) Limited | Wholesale & retail | 2013 |
| MTH Ltd | Wholesale & retail | 2023 |
| MTR Group International Ltd | Wholesale & retail | 2018 |
| MTR Group Recruitment Ltd | Professional & scientific | 2020 |
| Muhsen Car Wash Liverpool Ltd | Administrative & support | 2024 |
| Muirhead AVE Property Ltd | Real estate | 2010 |
| Multicare Staff Solutions Ltd | Administrative & support | 2025 |
| Murphy Brothers (Nationwide) Limited | Construction | 2016 |
| Murugan (PVT) Limited | Hospitality | 2023 |
| Murugan Imports Ltd | Wholesale & retail | 2026 |
| Musaz International Ltd | Wholesale & retail | 2026 |
| My Clean Solutions Ltd | Administrative & support | 2014 |
| My Home Rocks Interiors Ltd | Wholesale & retail | 2023 |
| My Pedal Ltd | Other services | 2026 |
| My Pizza(Liverpool) Ltd | Hospitality | 2019 |
| Myboxingcoach Ltd | Information & communication | 2017 |
| Myhomerocks Limited | Wholesale & retail | 2015 |
| N & S Investments Ltd | Wholesale & retail | 2001 |
| N W R Holdings Limited | Financial services | 2015 |
| N W Resources Limited | Other services | 2009 |
| N-Trust Homes CIC | Real estate | 2020 |
| N.A.G. Electrical Services Limited | Construction | 2020 |
| Naija Ghana African Shop Ltd | Wholesale & retail | 2025 |
| Nails Envy HV Ltd | Other services | 2025 |
| Naked Flame Heating Limited | Construction | 2017 |
| Nanuki Limited | Wholesale & retail | 2013 |
| Napoli Burgers Ltd | Hospitality | 2025 |
| Napoli Tasty Pizza Ltd | Hospitality | 2026 |
| Nathyzie Limited | Administrative & support | 2025 |
| Naturaprintsuk Ltd | Manufacturing | 2026 |