| MHP Medicare Ltd | Health & social care | 2021 |
| Michael Parkin Properties Ltd | Real estate | 2016 |
| Micste Holiday Rentals Limited | Hospitality | 2018 |
| Midnight Paranormal Ltd | Arts & recreation | 2025 |
| Mightyfibre Ltd | Wholesale & retail | 2025 |
| Mihai Hutuleac Ltd | Wholesale & retail | 2021 |
| Mikado Logistics Limited | Transport & logistics | 2023 |
| Mike Burden NW Ltd | Construction | 2022 |
| Mike Norman Ltd | Health & social care | 2022 |
| Mike Thelwell Flooring Ltd. | Construction | 2011 |
| Mike's Train Refurb Ltd | Professional & scientific | 2019 |
| Mikevisuals Limited | Professional & scientific | 2018 |
| Miller Dental Ltd | Health & social care | 2022 |
| Miller Murray Properties Limited | Real estate | 2024 |
| Millinnium Tandoori Limited | Hospitality | 2022 |
| Mindful Medix CPD Ltd | Public administration | 2026 |
| Minerva Homes & Investments Limited | Real estate | 2017 |
| Minerva Secure Limited | Information & communication | 2022 |
| MIR Trading Ltd | Hospitality | 2014 |
| Miracle Properties Ltd | Real estate | 2019 |
| Miran Property Management Ltd | Real estate | 2021 |
| Mirikit Property Ltd | Real estate | 2019 |
| Mirinick Limited | Transport & logistics | 2025 |
| Mirwings Smile Limited | Health & social care | 2021 |
| Miss Attire Limited | Wholesale & retail | 2018 |
| Misty Mountains Therapy Ltd | Health & social care | 2019 |
| Mitchell & Kane Properties Limited | Professional & scientific | 2015 |
| MJ Consultants Ltd | Professional & scientific | 2014 |
| MJ Mechanical Services (NW) Limited | Transport & logistics | 2020 |
| MJ Property (North West) Limited | Real estate | 2013 |
| MJ Technical Design Ltd | Professional & scientific | 2010 |
| MJC Equestrian Ltd | Other services | 2025 |
| ML Industrial & Marine Silencers Ltd | Manufacturing | 2009 |
| MLC Renovations Ltd | Construction | 2025 |
| MM100 Ltd | Information & communication | 2024 |
| MMC Contractor Limited | Administrative & support | 2017 |
| MMC Holding Group Limited | Financial services | 2018 |
| Mmcg Aero Ltd | Manufacturing | 2018 |
| Mmelectricalltd Limited | Construction | 2019 |
| Mni.Dent Ltd | Health & social care | 2024 |
| Mobile Internet Ventures Ltd | Wholesale & retail | 2014 |
| Mocha Property Investments Ltd | Real estate | 2026 |
| Mocha Property Management Ltd | Real estate | 2023 |
| Mock and Turner Limited | Construction | 2023 |
| Mocs Ltd | Construction | 2025 |
| Moduleco Healthcare Limited | Administrative & support | 2008 |
| Monpen Ltd | Real estate | 2020 |
| Moorcroft Construction Limited | Construction | 1992 |
| More Than Just Cleaners Limited | Administrative & support | 2026 |
| Morgan Hunt Properties Limited | Real estate | 2024 |
| Morprop Investments Ltd | Real estate | 2025 |
| Mortgage Wallet Limited | Information & communication | 2020 |
| Moshtaha Limited | Health & social care | 2024 |
| Motifications Ltd | Information & communication | 2026 |
| Motion Multi Drop Limited | Other services | 2020 |
| Moto Assist Ltd | Wholesale & retail | 2021 |
| Moto Revive Ltd | Wholesale & retail | 2023 |
| Motor Sport (North West) Limited | Arts & recreation | 1998 |
| Mountain Heaven Ltd | Administrative & support | 2003 |
| Mountain Pass Productions Limited | Information & communication | 2022 |
| Mour Properties Ltd. | Real estate | 2003 |
| MPC Coaching Ltd | Arts & recreation | 2025 |
| MPJ Office Solutions Ltd | Administrative & support | 2010 |
| MPS UK Group Limited | Professional & scientific | 2011 |
| MR Biomass Energy Services Limited | Professional & scientific | 2025 |
| MR Controls and Instrumentation Ltd | Construction | 2019 |
| MRM Health Ltd | Health & social care | 2020 |
| Mryant.S.C.O Limited | Construction | 2020 |
| Mscompliance Ltd | Water & waste | 2022 |
| MSM Engineering Group Ltd | Construction | 2026 |
| Mull Interiors Ltd | Wholesale & retail | 2023 |
| Mustique by Natasha Ltd | Health & social care | 2018 |
| Mworks Solutions Limited | Other services | 2025 |
| MYB Clinical Ltd | Health & social care | 2023 |
| MYB Property Ltd | Real estate | 2020 |
| Myeveryday Ltd | Wholesale & retail | 2025 |
| Mykitchenmcr Ltd | Hospitality | 2024 |
| Mökina Limited | Arts & recreation | 2024 |
| N D Garner & Co Ltd | Professional & scientific | 2017 |
| N J Harrison Limited | Construction | 2023 |
| N.A.Nawaz Property Limited | Real estate | 2021 |
| N.D Sales Ltd | Wholesale & retail | 2025 |
| N.P.D Engineering Limited | Manufacturing | 2025 |
| Najay Aviation Construction Ltd | Manufacturing | 2025 |
| Nank C Ltd | Real estate | 2024 |
| Nation Electrical Testing Ltd | Construction | 2019 |
| National Logistics Training Consortium Ltd | Education | 2015 |
| National Milk Cafe Ltd | Hospitality | 2019 |
| Native Landscape Design Ltd | Professional & scientific | 2023 |
| Nattys Care Ltd | Health & social care | 2026 |
| Natural Limited | Wholesale & retail | 2001 |
| Natural Stone Veneer Limited | Wholesale & retail | 2012 |
| Natural TOO Limited | Wholesale & retail | 2002 |
| Naughty Corner Productions Ltd | Arts & recreation | 2014 |
| Navcare Group Limited | Administrative & support | 2025 |
| NC Nxplus Ltd | Health & social care | 2025 |
| NCD Music Ltd | Information & communication | 2024 |
| ND Directed C.I.C. | Health & social care | 2023 |
| Ndcp Limited | Administrative & support | 2010 |
| Neat Works NW Limited | Administrative & support | 2024 |