| Motor Cover Ltd | Other services | 2025 |
| Motor Finance Ltd | Financial services | 2025 |
| Motor Products Online Limited | Financial services | 2009 |
| Motorcare (Bristol) Limited | Wholesale & retail | 2022 |
| Motorcare (Kent) Limited | Wholesale & retail | 2003 |
| Motorhouse (ST. Helens) Limited | Wholesale & retail | 2004 |
| Motormad Ltd | Wholesale & retail | 2022 |
| Motorspray Solutions Limited | Wholesale & retail | 2021 |
| Mouna Limited | Wholesale & retail | 2025 |
| Mount Acre Construction Cheshire Limited | Construction | 2022 |
| Mount Acre Construction Formby Limited | Administrative & support | 2022 |
| Mount Acre Construction Ltd. | Construction | 2022 |
| Mount Acre Homes Ltd. | Administrative & support | 2018 |
| Mount Darwen Estates Limited | Real estate | 2021 |
| Mount Moriah Resorts Ltd | Hospitality | 2025 |
| Mousehole Films Limited | Information & communication | 2012 |
| Moyo's Brothers Limited | Hospitality | 2019 |
| Mozza Merseyside Limited | Hospitality | 2025 |
| MP Daily Mart Ltd | Wholesale & retail | 2025 |
| MP Dentures Limited | Health & social care | 2019 |
| MP Property Holdings Ltd | Real estate | 2020 |
| Mpjg Consultancy Ltd | Public administration | 2021 |
| Mpkp Transport Ltd | Other services | 2024 |
| Mpro Ltd. | Other services | 2023 |
| MR Barbers CUT Ltd | Other services | 2024 |
| MR Brothers Transport Ltd | Transport & logistics | 2024 |
| MRJ Shopfitters Limited | Construction | 1997 |
| MRK Logistics Limited | Transport & logistics | 2014 |
| MRK Tech Solutions Ltd | Wholesale & retail | 2020 |
| MRM Trading Limited | Professional & scientific | 2022 |
| Mrts Consulting Ltd | Professional & scientific | 2019 |
| MSH Services (NW) Ltd | Energy | 2025 |
| Mspeed Logistics Limited | Transport & logistics | 2023 |
| Mstrpiece Live Ltd | Arts & recreation | 2025 |
| MT Property Holdings Ltd | Real estate | 2018 |
| MT Southport Ltd | Arts & recreation | 2024 |
| MTM Electrical Ltd | Construction | 2021 |
| MTR by Aimee Ltd | Wholesale & retail | 2026 |
| MTS Joinery & Construction Ltd | Construction | 2019 |
| Mudita Accountancy Ltd | Professional & scientific | 2026 |
| Muir P D Limited | Health & social care | 2014 |
| Mulla Medical Services Limited | Health & social care | 2016 |
| Mullen Services Ltd | Construction | 2024 |
| Mummyfit Sefton & West Lancashire Limited | Arts & recreation | 2025 |
| Mums the Word Northwest CIC | Health & social care | 2024 |
| Munchies Southport Ltd | Hospitality | 2025 |
| Murphy Golf Tech Limited | Manufacturing | 2025 |
| Murray Electrical Contractors Ltd | Construction | 2022 |
| Murray's Fresh Fish Limited | Extraterritorial | 2014 |
| Murrow Homes Ltd | Real estate | 2019 |
| Musa Bros Ltd | Wholesale & retail | 2025 |
| Muscletech Ltd | Arts & recreation | 2024 |
| Muse Aesthetics Skin Limited | Other services | 2024 |
| Musica Ventures Ltd | Hospitality | 2025 |
| Musicbar Limited | Hospitality | 2026 |
| MVH Property Ltd | Administrative & support | 2013 |
| MVH Real Estate Limited | Administrative & support | 2017 |
| MVS Laser Cutting Limited | Professional & scientific | 2013 |
| MW Bargain Ltd | Wholesale & retail | 2020 |
| My Accountancy Hub Ltd | Professional & scientific | 2018 |
| My Birthday Draw Limited | Arts & recreation | 2025 |
| My Charlie BOY Ltd | Administrative & support | 2018 |
| My Little Travel Company Ltd | Administrative & support | 2015 |
| My Margot Ltd | Information & communication | 2025 |
| My Mind Matters (Merseyside) CIC | Health & social care | 2024 |
| Mydobi Ltd | Other services | 2022 |
| Mymall Europe Limited | Wholesale & retail | 2018 |
| Mymantels Ltd | Manufacturing | 2023 |
| Mynydd Moesol Ltd | Other services | 2024 |
| N & D Service Station Ltd | Wholesale & retail | 2015 |
| N & P Building Contractors Limited | Construction | 2004 |
| N & P Investment Properties Limited | Real estate | 2006 |
| N and L Watson Limited | Wholesale & retail | 2003 |
| N. J. E. Finance Ltd | Financial services | 2017 |
| N. Y. Luxury Cars UK Limited | Wholesale & retail | 2008 |
| N.B. Services Southport Limited | Construction | 2016 |
| N.K. Optics Limited | Wholesale & retail | 2008 |
| N.T. Nolan (Roofing) Limited | Construction | 1973 |
| N.W.Bathroom Ltd | Construction | 2021 |
| N.W.Partitions & Ceilings Ltd | | 2012 |
| N166 Limited | Real estate | 2022 |
| N4URO Ltd | Health & social care | 2019 |
| Naap Accountants (London) Ltd | Professional & scientific | 2023 |
| Naap Accountants Ltd | Professional & scientific | 2007 |
| Naap INV Ltd | Professional & scientific | 2015 |
| NAB Aesthetics Ltd | Other services | 2023 |
| Nabzy Lease Limited | Real estate | 2024 |
| Nabzys Foods Limited | Hospitality | 2024 |
| Nabzys Management Limited | Professional & scientific | 2022 |
| Nads Carz Ltd | Wholesale & retail | 2019 |
| Nail Paradise Southport Ltd | Other services | 2019 |
| Nancherro Properties Limited | Real estate | 2021 |
| Nascem Ltd | Professional & scientific | 2021 |
| Nation HQ Limited | Professional & scientific | 2025 |
| National Dental Supplies Limited | Health & social care | 1923 |
| National Discount Supplies Ltd | Wholesale & retail | 2023 |
| National Grid Scaffolding Ltd | Construction | 2023 |
| National Networks Limited | Administrative & support | 2018 |
| National Tech Processing Ltd | Arts & recreation | 2023 |
| Nationwide Fleet Installations Ltd | Manufacturing | 1995 |