| Merlin Machinery Sales Limited | Wholesale & retail | 2009 |
| Metal Track Limited | Extraterritorial | 2022 |
| Metapisca Ltd | Wholesale & retail | 2019 |
| Metfab Services Ltd | Manufacturing | 2020 |
| Mevsaph Ltd | Wholesale & retail | 2019 |
| MEW Property Maintenance Services Ltd | Construction | 2017 |
| MFG Executor and Trustee Company | Other services | 2010 |
| MFG Legal Services Limited | Administrative & support | 2015 |
| MFG Solicitors LLP | | 2006 |
| MG Exhibitions Ltd | Construction | 2012 |
| MGD Bathrooms & Heating Ltd | Construction | 2022 |
| MH Investment Holdings Ltd | Financial services | 2020 |
| MH Legal Services Limited | Financial services | 2018 |
| MHT Couriers Ltd | Transport & logistics | 2025 |
| Michael Roddie Ltd | Transport & logistics | 2026 |
| Microplus Engineering Limited | Manufacturing | 1980 |
| Midas Financial Planning Services Limited | Financial services | 2005 |
| Midland Active Properties Limited | Real estate | 2007 |
| Midland Autobreakers Smethwick Limited | Water & waste | 2014 |
| Midland Enterprises (West Midlands) Limited | Hospitality | 2019 |
| Midland Fire & Security Ltd | Construction | 2016 |
| Midland Ground Support Equipment Limited | Professional & scientific | 2017 |
| Midland Group (West Midlands) Limited | Extraterritorial | 2017 |
| Midland Pest and Property Solutions Ltd | Administrative & support | 2025 |
| Midland Print Machinery Limited | Professional & scientific | 1995 |
| Midland Speedshop Limited | Wholesale & retail | 2017 |
| Midland Therapy Group Ltd | Health & social care | 2024 |
| Midland Therapy Group Training Ltd | Education | 2024 |
| Midland Warm Roofs Ltd. | Construction | 2017 |
| Midlands Biohazard Trauma Specialist Cleaning Limited | Water & waste | 2025 |
| Midlands Cutting Services Limited | Manufacturing | 2010 |
| Midlands Cyber Ltd | Information & communication | 2021 |
| Midlands Physiotherapy (Properties) Limited | Households | 2020 |
| Midlands Physiotherapy Limited | Arts & recreation | 2003 |
| Midreliver Ltd | Administrative & support | 2018 |
| Midweigh Limited | Manufacturing | 2012 |
| Midwest Installation & Maintenance Ltd | Construction | 2018 |
| Mihai Brinzea Transport Ltd | Transport & logistics | 2019 |
| Mike & Sons Ltd | Education | 2019 |
| Mike Maguire Support Ltd | Health & social care | 2015 |
| Mike Roberts Transport Ltd | Transport & logistics | 2019 |
| Mike Stanton Motors Worcestershire Limited | Wholesale & retail | 2023 |
| Milaeva Holdings UK Limited | Financial services | 2025 |
| Milaeva Ltd | Real estate | 2024 |
| Milan Pizza and Chicken Limited | Hospitality | 2025 |
| Milden Steels Limited | Administrative & support | 1976 |
| Milepitch Ltd | Administrative & support | 2018 |
| Milkvines Ltd | Administrative & support | 2019 |
| Millbrook Management (NO 1) Limited | Households | 1994 |
| Millcourt Developments Limited | Professional & scientific | 2005 |
| Millennium Weavers Ltd | Wholesale & retail | 2021 |
| Millenniumpod Ltd | Wholesale & retail | 2019 |
| Miller Prime Properties Ltd | Real estate | 2024 |
| Millers Flooring Ltd | Construction | 2003 |
| Millminster Ltd | Wholesale & retail | 2019 |
| Mills Films Productions Limited | Professional & scientific | 2017 |
| Millson Engineering Limited | Manufacturing | 1994 |
| Milowych Limited | Professional & scientific | 2005 |
| Miltech Simulations Limited | Manufacturing | 1999 |
| Mindboost Consulting Ltd | Professional & scientific | 2024 |
| Mindprice Ltd | Administrative & support | 2019 |
| Minute Massage Ltd | Other services | 2018 |
| Miro Facilities Management Limited | Transport & logistics | 2016 |
| Mirrorrobes Limited | Manufacturing | 2014 |
| Mischa (Management) Limited | Real estate | 1989 |
| Mitchcomm Limited | Construction | 2017 |
| Mitchell Roberts Professional Tree Surgeon Limited | Administrative & support | 2023 |
| Mitchells Services Ltd | Construction | 2021 |
| Mitera Technologies Ltd | Information & communication | 2017 |
| Miturzab Ltd | Wholesale & retail | 2024 |
| Mixbroomer Ltd | Wholesale & retail | 2018 |
| Mixmeteor Ltd | Wholesale & retail | 2018 |
| Mizhazith Ltd | Hospitality | 2023 |
| MJ & LM Clack Ltd | Financial services | 2026 |
| MJ Coffee House Limited | Hospitality | 2019 |
| MJ Edge Ltd | Hospitality | 2022 |
| MJ White Building Contractors Limited | Construction | 2019 |
| MJC Estates Limited | Real estate | 2019 |
| MJD Advocacy Services Limited | Administrative & support | 2016 |
| MJE Surface Repair Specialist Ltd | Construction | 2023 |
| MJF Electrics Ltd | Manufacturing | 2015 |
| MJG Construction Ltd | Construction | 2021 |
| MJS Business Services Ltd | Professional & scientific | 2014 |
| MK Aspire Ltd | Manufacturing | 2025 |
| MKH Building Services Limited | Construction | 2005 |
| MKR Consulting Ltd | Information & communication | 2026 |
| ML Premier Services Limited | Information & communication | 2012 |
| MLI Racking Limited | Construction | 2019 |
| MLR Catering Ltd | Wholesale & retail | 2024 |
| MLW Installations Limited | Extraterritorial | 2014 |
| MLW Project Management Limited | Professional & scientific | 2018 |
| MMD Distributions Ltd | Wholesale & retail | 2026 |
| MMF Shocks Ltd | Wholesale & retail | 2023 |
| Mnop Properties Limited | Real estate | 2021 |
| MNS Supermarket Limited | Wholesale & retail | 2024 |
| Mobhut Ltd | Wholesale & retail | 2020 |
| Mobile Secure Grip Ltd | Wholesale & retail | 2025 |
| Mobiline Kidderminster Ltd | Wholesale & retail | 2023 |
| Mobility Services Midlands Limited | Wholesale & retail | 2012 |
| Mobzone Kidderminster Ltd | Wholesale & retail | 2023 |