| MD Property Improvements Ltd | Construction | 2020 |
| MD Safety Management Limited | Professional & scientific | 2015 |
| MD Safety Publishing Ltd | Information & communication | 2025 |
| MDC Fire Protection Limited | Construction | 2022 |
| MEC Clothing Ltd | Wholesale & retail | 2023 |
| Medbourne Court One RTM Company Ltd | Households | 2017 |
| Medbourne Court Two RTM Company Ltd | Households | 2017 |
| Medsd Ltd | Health & social care | 2024 |
| Medve Consulting Ltd | Professional & scientific | 2021 |
| MEL Waste Insights Limited | Administrative & support | 2018 |
| Melic Fabrication Limited | Construction | 2003 |
| Melissa's Spa & Nails Limited | Other services | 2022 |
| Melling Mortgages Ltd | Financial services | 2021 |
| Meno Health Hub Limited | Public administration | 2026 |
| Merrigold Energy Ltd | Wholesale & retail | 2025 |
| Mersey Care Limited | Administrative & support | 2012 |
| Mersey Mould Ltd | Construction | 2024 |
| Merseyside Door Company Ltd | Manufacturing | 2025 |
| Merseyside Roofing & Building Contractors Ltd | Construction | 2023 |
| Merseyside Send Support Network CIC | Education | 2025 |
| MEW Design & Build Ltd | Financial services | 2020 |
| MEW Design Limited | Real estate | 2016 |
| MF Cheshire Ltd | Education | 2025 |
| MF Cheshire M&G Ltd | Education | 2025 |
| MF Creations Ltd | Professional & scientific | 2023 |
| MF Merseyside Ltd | Education | 2025 |
| MF Warrington Ltd | Education | 2025 |
| Michael D Bell Services Limited | Real estate | 2025 |
| Michael Ventre Limited | Hospitality | 2017 |
| Miconn Ltd | Construction | 2019 |
| Migueldoforo.Com Ltd | Arts & recreation | 2022 |
| Mikadon Ltd | Construction | 2019 |
| Mike Edwards Services Limited | Wholesale & retail | 2002 |
| Mini Beans Play Cafe Limited | Hospitality | 2025 |
| Minta Medical Limited | Manufacturing | 2001 |
| Mitchell Industrial Services Holdings Ltd | Financial services | 2018 |
| MJR Consulting Limited | Professional & scientific | 2026 |
| MJS Electrical Testing Limited | Construction | 2010 |
| MJS Property Developments Limited | Construction | 2004 |
| Mkwidza Ltd | Professional & scientific | 2020 |
| ML Property Holdings Ltd | Real estate | 2020 |
| MMC Telecoms Ltd | Information & communication | 2022 |
| Mmhltd Limited | Construction | 2016 |
| MOA Prescot Ltd | Hospitality | 2022 |
| Monk Security Limited | Administrative & support | 2018 |
| Monkey Beard Ltd | Professional & scientific | 2016 |
| Mook Garden Designs Ltd | Administrative & support | 2020 |
| Moore RX Ltd | Health & social care | 2025 |
| More Than Words Interpreting (BSL) Limited | Professional & scientific | 2022 |
| Morgan Walker Limited | Professional & scientific | 2007 |
| Morpheus VR Ltd | Information & communication | 2022 |
| Morris - Rodgers Ltd | Construction | 2016 |
| Mosow Limited | Professional & scientific | 2019 |
| Motorcare (Northwest) Limited | Wholesale & retail | 2022 |
| MPM Special Projects Limited | Manufacturing | 2010 |
| MPN Engineers & Consultants Limited | Professional & scientific | 2024 |
| MRK Transportation Limited | Transport & logistics | 2018 |
| Msbodytransformations Ltd | Arts & recreation | 2020 |
| MSP Technologies Limited | Manufacturing | 2013 |
| Multifit-Pilates Ltd | Education | 2023 |
| Murphy Lane Developments Ltd | Construction | 2023 |
| Murphy Lane Estates Ltd | Real estate | 2022 |
| Mutual Governance Limited | Professional & scientific | 2014 |
| MVP Games Ltd | Information & communication | 2024 |
| MWL Finance Broker Ltd | Financial services | 2025 |
| Mybreezylife Ltd | Wholesale & retail | 2023 |
| Mychujai Ltd | Households | 2024 |
| N P Developments Limited | Real estate | 2002 |
| N S C Training | Other services | 1998 |
| N74 Limited | Professional & scientific | 2024 |
| Nails by... Limited | Other services | 2019 |
| Namaste Gurkha Ltd | Hospitality | 2023 |
| Naomie Lukunga Services Limited | Professional & scientific | 2023 |
| Naples Developments Ltd | Construction | 2018 |
| Natalie Anne Walker Ltd | Health & social care | 2023 |
| National Road Surfacing Ltd | Construction | 2020 |
| National Support Housing Ltd | Real estate | 2020 |
| National Tool Hire Limited | Information & communication | 2014 |
| National Trucks Ltd | Wholesale & retail | 2021 |
| Nazirs Spices Limited | Extraterritorial | 1993 |
| Ndke Enterprises Ltd | Wholesale & retail | 2026 |
| Ndtc Ltd | Education | 2023 |
| Nellcom Limited | Information & communication | 2021 |
| Nelson Training and Risk Management Ltd | Public administration | 2024 |
| Neuroscroll Labs Ltd | Information & communication | 2025 |
| Neutricore Ltd | Manufacturing | 2026 |
| New Bird Kitchen Limited | Hospitality | 2025 |
| New Brook Property Ltd | Real estate | 2019 |
| New ERA Dance Academy Ltd | Arts & recreation | 2020 |
| New FAZ Ltd | Other services | 2015 |
| New Home Renovations Ltd | Households | 2020 |
| New Roots Children's Services Limited | Health & social care | 2017 |
| New Star Supermarket Ltd | Wholesale & retail | 2025 |
| New World Domestic Appliances Limited | Manufacturing | 1961 |
| Newhouse Training Academy Ltd | Education | 2024 |
| Newns Safety Solutions Ltd | Public administration | 2019 |
| NGE Finance Ltd | Administrative & support | 2013 |
| Niche Property Investments Limited | Real estate | 2019 |
| Night Love YOU Ltd | Wholesale & retail | 2025 |
| Nisus Controls Ltd | Information & communication | 2018 |