| Malpass Pest Solutions Limited | Administrative & support | 2017 |
| Manage Cloud Limited | Extraterritorial | 2008 |
| Mandy Taylor Consultancy Limited | Professional & scientific | 2024 |
| Manna House Health Education & Wellness Community Interest Company | Public administration | 2019 |
| Manny Deol OT Services Limited | Health & social care | 2022 |
| Mansion House Surgery GPF Limited | Professional & scientific | 2013 |
| Marathon Software Limited | Information & communication | 2022 |
| Marcos Clowes Limited | Professional & scientific | 2013 |
| Mardi Investments Limited | Construction | 1990 |
| Marie Proud Family Law Ltd | Professional & scientific | 2024 |
| Mariescott Ltd | Professional & scientific | 2024 |
| Mark Salt Limited | Administrative & support | 2012 |
| Martin Boddison Limited | Information & communication | 2006 |
| Mat-Tech Joining Technologies Ltd | Administrative & support | 2018 |
| Matchsticks Day Nurseries Limited | Education | 2025 |
| Maxgas-Staffs Limited | Manufacturing | 2014 |
| MB3 Group Limited | Professional & scientific | 2020 |
| Mcconnell & Company Accountants LLP | | 2009 |
| Mclaren Interiors Ltd | Construction | 2025 |
| Meaford Holdings Limited | Financial services | 2020 |
| Medicoleila Ltd | Health & social care | 2017 |
| MEDS4U Limited | Wholesale & retail | 2004 |
| Meece Ventures Limited | Real estate | 2025 |
| Meetime Limited | Information & communication | 2016 |
| Melia Creative Ltd | Professional & scientific | 2015 |
| Meraxian Limited | Administrative & support | 2017 |
| Merlin Capital Holdings Ltd | Financial services | 2023 |
| Mesh Operations Ltd | Arts & recreation | 2025 |
| MG Acquisitions and Development Ltd | Financial services | 2024 |
| MH ESS Ltd | Construction | 2025 |
| MH Irrigation Services Limited | Other services | 2016 |
| Mhtd Developments Limited | Real estate | 2024 |
| MI Accountancy Solutions Limited | Professional & scientific | 2012 |
| Mick Parnell Roofing Contractors Limited | Construction | 2022 |
| Midland Communications International Ltd | Information & communication | 2008 |
| Midland MB Limited | Wholesale & retail | 2023 |
| Midlands 3D Printing Ltd | Manufacturing | 2018 |
| Midlands Cycles Limited | Wholesale & retail | 2019 |
| Midlandsfrs Limited | Public administration | 2019 |
| Mile-X Associates Ltd | Professional & scientific | 2015 |
| Milestone Gyms Ltd | Arts & recreation | 2016 |
| Mill House @ Stone Ltd | Hospitality | 2026 |
| Millers Gate Limited | Extraterritorial | 2009 |
| Milo Bear Limited | Wholesale & retail | 2021 |
| Mishka Cafe Ltd | Hospitality | 2025 |
| Mishka Chocolates Ltd | Manufacturing | 2025 |
| Mishka Lifestyle Ltd | Wholesale & retail | 2025 |
| Miska Ritual Ltd | Manufacturing | 2023 |
| Misra Medical Services Limited | Health & social care | 2015 |
| Miss Little Dust Ltd | Administrative & support | 2025 |
| Mission Vans CIC | Transport & logistics | 2023 |
| MJA Solutions Ltd | Professional & scientific | 2013 |
| MJB (Midlands) Ltd | Wholesale & retail | 2016 |
| ML Wenlock Ltd | Construction | 2018 |
| MLM Engineering Design Ltd | Professional & scientific | 2022 |
| Modcomms Marketing Ltd | Professional & scientific | 2023 |
| Moddershall Oaks HR Limited | Other services | 2021 |
| Moddershall Oaks Limited | Other services | 2021 |
| Moddj Limited | Real estate | 2025 |
| Modified Solutions Ltd | Administrative & support | 2008 |
| Mojos Bar Limited | Hospitality | 2017 |
| Mole Civils Limited | Construction | 2024 |
| Molo Cleaning Services Ltd | Administrative & support | 2019 |
| Monmore Properties Limited | Professional & scientific | 2008 |
| Mont Millais Limited | Real estate | 2008 |
| Montfort Properties Ltd | Real estate | 2019 |
| Monty's Brickwork & General Building Ltd | Construction | 2015 |
| Morris Commercial EOT Limited | Financial services | 2023 |
| Moss Rose Farm Limited | Extraterritorial | 2013 |
| Motionatics Limited | Manufacturing | 2024 |
| Motus Medical Ltd | Health & social care | 2016 |
| Mountfield Care Home Limited | Health & social care | 2012 |
| Moyo Care Ltd | Health & social care | 2018 |
| MP Copywriting Limited | Professional & scientific | 2015 |
| Mppv Solutions Limited | Information & communication | 2019 |
| MPS Mechanical Welding Services Ltd | Wholesale & retail | 2024 |
| MRS YUM YUM Limited | Administrative & support | 2017 |
| MSB SPV Ltd | Real estate | 2022 |
| MTH Transitioning Ltd | Professional & scientific | 2013 |
| Multi Industries Limited | Administrative & support | 2006 |
| Mumbles Day Nursery Limited | Health & social care | 2007 |
| MW ARB Limited | Agriculture & fishing | 2024 |
| My Dessert Palace Ltd | Wholesale & retail | 2023 |
| Mylen PŌL Ltd | Hospitality | 2025 |
| N41 Sport & Performance Psychology Services Ltd | Professional & scientific | 2019 |
| Nacre Group Ltd | Professional & scientific | 2022 |
| NAILS4U Stone Limited | Other services | 2019 |
| National Gardens Specialist Ltd | Professional & scientific | 2022 |
| National Renters Alliance Ltd | Other services | 2015 |
| Neds Building & Groundworks Limited | Construction | 2025 |
| Neoteric Solutions Limited | Professional & scientific | 2018 |
| New Beginnings (Mortgage & Finance) Ltd. | Financial services | 2008 |
| New Cold Meece Consortium Limited | Other services | 2007 |
| New Court Property Management Limited | Extraterritorial | 2006 |
| Newfields Haylage Limited | Agriculture & fishing | 2018 |
| Newtectic Alloy Castings (Wolves) Limited | Manufacturing | 2025 |
| Nextplai Limited | Information & communication | 2025 |
| NHT London Ltd | Professional & scientific | 2023 |
| NIC & Steph Properties Ltd | Real estate | 2026 |
| Nicholls Nexus Group Ltd | Financial services | 2023 |