| MP Investigations Ltd | Financial services | 2022 |
| MP Surveys Ltd | Professional & scientific | 2016 |
| MPD Properties NW Ltd | Real estate | 2024 |
| Mpsa Limited | Professional & scientific | 2020 |
| Mpw.Cs Ltd | Construction | 2026 |
| MR Electrical Contractors Ltd | Construction | 2016 |
| MR Engineering Solutions Ltd | Professional & scientific | 2017 |
| MR Fox’S PAD Limited | Hospitality | 2023 |
| MR Partload Ltd | Wholesale & retail | 2013 |
| MR Pizza Kasa Ltd | Hospitality | 2025 |
| MR. Snips Limited | Other services | 2011 |
| MR2CM Ltd | Construction | 2025 |
| MRL Media Ltd | Other services | 2023 |
| MRZ Restaurant Ltd | Hospitality | 2018 |
| Mrza Developments Ltd | Real estate | 2025 |
| MS Welding Services Ltd | Construction | 2017 |
| Mscg Coaching Ltd | Hospitality | 2025 |
| Mscg Development Ltd | Real estate | 2021 |
| MSM Contract Services Ltd | Construction | 2023 |
| Msoft E-Solutions Limited | Information & communication | 2025 |
| MSOFT360.CLOUD Limited | Information & communication | 1999 |
| MSS Terrace Limited | Hospitality | 2018 |
| MST Fleet Services Limited | Manufacturing | 2008 |
| MST Special Products Limited | Manufacturing | 2009 |
| MT QA Services Ltd | Information & communication | 2022 |
| MT Sports Consultancy Limited | Other services | 2021 |
| MTA Sports Group Limited | Administrative & support | 2019 |
| MTC Software Ltd | Manufacturing | 2015 |
| MTD Bookkeeping Solutions Ltd | Professional & scientific | 2025 |
| MTS Electricals (NW) Limited | Construction | 2014 |
| Muddle Duck Ltd | Wholesale & retail | 2022 |
| Muddynuts Ltd | Wholesale & retail | 2021 |
| Mukerji Business Systems LLP | | 2025 |
| Muldron Ltd | Real estate | 2024 |
| Mulk Civil Engineering & Environmental Services Ltd | Construction | 2017 |
| Mullarkey Software Limited | Information & communication | 2009 |
| Mullen Digital Limited | Information & communication | 2012 |
| Mullen Residential Limited | Real estate | 2024 |
| Mulliner Limited | Wholesale & retail | 2013 |
| Multi Tech Services Ltd | Professional & scientific | 2024 |
| Multiplant Services Ltd | Education | 2026 |
| Multiplex Decks Ltd | Arts & recreation | 2023 |
| Mummys Magic Limited | Manufacturing | 2012 |
| Munch Birkenhead Ltd | Hospitality | 2026 |
| Munch Wirral Ltd | Hospitality | 2025 |
| Murdo Mason Therapy Limited | Health & social care | 2015 |
| Muromall Productions Ltd | Information & communication | 2017 |
| Murray & Co Property Group Ltd | Financial services | 2025 |
| Murrell Enterprises Ltd | Wholesale & retail | 2024 |
| Mustard Plans Ltd | Professional & scientific | 2025 |
| Muzzy Cafe Bebington Ltd | Hospitality | 2025 |
| Muzzy Food Wirral Ltd | Hospitality | 2026 |
| Muzzy's Breakfast House Ltd | Hospitality | 2019 |
| MUZZY2 Heswall Ltd | Hospitality | 2026 |
| MVN Investments Ltd | Financial services | 2021 |
| Mvpc Films Limited | Information & communication | 2023 |
| MW Antiques Ltd | Wholesale & retail | 2016 |
| MW Rope Access Solutions Limited | Construction | 2018 |
| MW Technology Solutions Ltd | Information & communication | 2013 |
| Mworrallo FS Ltd | Financial services | 2024 |
| My Accounts 247 Limited | Professional & scientific | 2018 |
| My Allergy Menu Ltd | Information & communication | 2025 |
| My Event Galaxy Ltd. | Professional & scientific | 2021 |
| My Gcse Tutor Ltd | Administrative & support | 2021 |
| My Home Call Ltd | Information & communication | 2024 |
| My Marine Services Ltd | Other services | 2013 |
| Mybabybook Limited | Professional & scientific | 2015 |
| Myqen Limited | Wholesale & retail | 2020 |
| Mysai Ltd | Real estate | 2024 |
| Mywinelabel Limited | Wholesale & retail | 2013 |
| Männerhaus Ltd | Other services | 2022 |
| N & J Medical Limited | Health & social care | 2015 |
| N a Solutions Limited | Information & communication | 2005 |
| N B. Itco Limited | Other services | 2001 |
| N-Tech Services Limited | Information & communication | 2021 |
| Nadar Geomatics Ltd | Information & communication | 2021 |
| Nade Studio Ltd | Other services | 2021 |
| Naeem & Daisy Limited | Real estate | 2022 |
| Naheed and Alin Properties Ltd | Real estate | 2023 |
| Naicre Group Ltd | Real estate | 2025 |
| Nail Heaven Ltd | Other services | 2008 |
| Nails Express & Spa Ltd | Other services | 2022 |
| Nala Maison Ltd | Wholesale & retail | 2025 |
| Nall Properties Ltd | Wholesale & retail | 2021 |
| Nallantopia Ltd | Real estate | 2022 |
| Nano IC Ltd | Information & communication | 2020 |
| Napoli Pizza Wirral Ltd | Hospitality | 2024 |
| Natalia Mortgages Limited | Financial services | 2021 |
| Natalie Marguet Ltd | Education | 2020 |
| Natasha Hall Law Limited | Professional & scientific | 2017 |
| Natasha Hall Legal Ltd | Professional & scientific | 2026 |
| National Consortium for Examination Results CIC | Education | 2012 |
| National Young Life Campaign Trust Limited(The) | Other services | 1939 |
| Nationwide Accident Hire Limited | Wholesale & retail | 2015 |
| Nationwide Fire Specialists Ltd | Manufacturing | 2023 |
| Nationwide Vision Ltd | Financial services | 2022 |
| Native Sole Group Ltd | Wholesale & retail | 2024 |
| Natural Floors Limited | Construction | 2004 |
| Natural Selection Design Ltd | Arts & recreation | 2015 |
| Naturen Ltd. | Wholesale & retail | 2009 |