| Merseyside Special Investment Venture Fund Two Limited | Financial services | 2001 |
| Merseyside Sports Foundation | Arts & recreation | 2012 |
| Merseyside Stove Services Ltd | Construction | 2011 |
| Merseyside Tamil School | Real estate | 2003 |
| Merseyside Technologies Ltd | Information & communication | 2002 |
| Merseyside Transport Trust | Arts & recreation | 2001 |
| Merseyside Tree Care Ltd | Administrative & support | 2025 |
| Merseyside Van Centre Ltd | Wholesale & retail | 2024 |
| Merseyside Van Sales Ltd | Wholesale & retail | 2023 |
| Merseyside Vehicle Movements T/A MVM Ltd | Transport & logistics | 2017 |
| Merseyside Weightlifting CIC | Arts & recreation | 2024 |
| Merseyside Wellbeing CIC | Health & social care | 2024 |
| Merseyside Workwear Ltd | Wholesale & retail | 2025 |
| Merseyside Yoruba Community CIC | Education | 2025 |
| Merseyside Youth Football League Ltd | Arts & recreation | 2025 |
| Merseysign Limited | Manufacturing | 2026 |
| Merseysourced Property Group Ltd | Real estate | 2020 |
| Merseystays Limited | Hospitality | 2025 |
| Merseystep Flooring Ltd | Wholesale & retail | 2026 |
| Merseystone Ltd | Mining & quarrying | 2021 |
| Merseytec Locksmiths Ltd | Other services | 2026 |
| Merseytech Services (NW) Ltd | Professional & scientific | 2018 |
| Merseytravel Limited | Professional & scientific | 1986 |
| Merseyview (Estates) Ltd | Real estate | 2017 |
| Merseyview Gardens Ltd | Real estate | 2017 |
| Merseyview Residential Surveyors Ltd | Professional & scientific | 2026 |
| Mersten Limited | Real estate | 2015 |
| Mersyside Rubbish Removals Limited | Administrative & support | 2025 |
| Mert House Special Ltd | Other services | 2020 |
| Merton Car Dismantlers Limited | Wholesale & retail | 2015 |
| Merton Estates Ltd | Real estate | 2013 |
| Merton Grove Vehicle Repairs Limited | Wholesale & retail | 2024 |
| MES (Liverpool) Ltd | Wholesale & retail | 2005 |
| Mescar Fisheries Limited | Agriculture & fishing | 2025 |
| Mesh North West Ltd | Professional & scientific | 2022 |
| Mesones Ltd | Professional & scientific | 2009 |
| Messom Telecoms Ltd | Information & communication | 2019 |
| Mesut Eren Ltd | Hospitality | 2018 |
| MET Builduk Limited | Construction | 2021 |
| MET Construction Services Ltd | Construction | 2016 |
| MET Leeds Hotel Opco Limited | Hospitality | 2018 |
| Metabolic Health FIX Community Interest Company | Health & social care | 2026 |
| Metabolism Ltd | Information & communication | 2026 |
| Metaconnex Ltd | Information & communication | 2023 |
| Metal Art Productions Limited | Wholesale & retail | 2014 |
| Metal Circuits Ltd | Professional & scientific | 2024 |
| Metal Offcuts Ltd | Manufacturing | 2025 |
| Metal Plas Moulding Solutiuons Ltd | Other services | 2024 |
| Metalbuild MCE Limited | Manufacturing | 2010 |
| Metalcrafts (1991) Limited | Manufacturing | 1992 |
| Metalmonkeyyoga Limited | Other services | 2022 |
| Metalon Roofing Ltd | Construction | 2026 |
| Metamorphia Ltd | Professional & scientific | 2024 |
| Metanax Asset Management Limited | Professional & scientific | 2021 |
| Metaverse Courier Ltd | Transport & logistics | 2022 |
| Metaworks Consulting Ltd | Professional & scientific | 2025 |
| Metcalf Contractors Ltd | Construction | 2025 |
| Metcalf Kitchens Ltd | Manufacturing | 2019 |
| Metcalf Property Development Ltd | Households | 2023 |
| Meteor Education Limited | Education | 2023 |
| Meteor Tuition Limited | Education | 2016 |
| Methus Ltd | Health & social care | 2012 |
| Metika Technologies Limited | Information & communication | 2026 |
| Metis Morgan Education Ltd | Education | 2022 |
| Metplus Care Ltd | Administrative & support | 2021 |
| Metro Cabs Sefton Ltd | Transport & logistics | 2016 |
| Metro Corner News Ltd | Wholesale & retail | 2020 |
| Metro Developments Limited | Construction | 1991 |
| Metro Discount Company Limited | Wholesale & retail | 2009 |
| Metro Garage Ltd | Wholesale & retail | 2015 |
| Metro Radio Cars Ltd | Transport & logistics | 2015 |
| Metro Sandwich Bar (NW) Ltd | Hospitality | 2015 |
| Metro Tyres Limited | Wholesale & retail | 2005 |
| Metroclean (UK) Ltd | Administrative & support | 2007 |
| Mevanti Ltd | Wholesale & retail | 2021 |
| MEW Consultancy Limited | Professional & scientific | 2022 |
| MEW Woolton Limited | Real estate | 2021 |
| Mewdia Ltd | Information & communication | 2024 |
| Mews Developments Limited | Real estate | 1970 |
| Mexi Trading (Liverpool) Limited | Hospitality | 2010 |
| Mexican Takeway Ltd | Hospitality | 2025 |
| Mexo Motors Ltd | Wholesale & retail | 2025 |
| Meydan Boutiques Ltd | Wholesale & retail | 2026 |
| Mezban Nice Food Ltd | Hospitality | 2021 |
| Mezcal Limited | Other services | 2024 |
| Mezze Associates Ltd | Professional & scientific | 2007 |
| Mezzoramia Advisory Services Ltd | Professional & scientific | 2022 |
| Mezzoramia Films Ltd | Information & communication | 2023 |
| Mezzoramia Sports and Entertainment Ltd | Arts & recreation | 2023 |
| MF Architecture Limited | Professional & scientific | 2014 |
| MF Building North West Limited | Construction | 2022 |
| MF Developments (NW) Limited | Construction | 2019 |
| MF Digital PVT Ltd | Professional & scientific | 2025 |
| MF Food Limited | Hospitality | 2016 |
| MF Hanover Street Limited | Hospitality | 2020 |
| MF New Brighton Limited | Hospitality | 2025 |
| MF Premises Liverpool Ltd | Other services | 2025 |
| MF Property Management Limited | Real estate | 2024 |
| MFB Consulting Engineers Ltd | Construction | 2025 |
| Mfdtelecoms Ltd | Professional & scientific | 2023 |