| Meva Formwork Systems Limited | Construction | 2006 |
| MF Web Ltd | Information & communication | 2020 |
| MFL Logistics Ltd | Transport & logistics | 2018 |
| MG Optical Limited | Wholesale & retail | 2010 |
| MG Turf Ltd | Construction | 2021 |
| MGA Autos Ltd | Wholesale & retail | 2023 |
| Mgn-Total Judo Coaching Ltd | Education | 2018 |
| MH Electrical Services Limited | Construction | 2001 |
| MH Signalling Ltd | Professional & scientific | 2014 |
| MHM Associates Ltd | Professional & scientific | 2011 |
| MHX Group Ltd | Professional & scientific | 2025 |
| MIA Waste Management Limited | Water & waste | 2022 |
| Mialet Ltd | Hospitality | 2025 |
| Michael Gaffney Project Services Limited | Construction | 2013 |
| Micro Provisioning 19 Limited | Administrative & support | 2019 |
| Microbiology Consulting Limited | Professional & scientific | 2011 |
| Micron Design Limited | Manufacturing | 2003 |
| Middleton Daycare Group Limited | Education | 2016 |
| Middleton Fruit and Vegetables Limited | Professional & scientific | 2011 |
| Middleton Hall Trading Ltd | Administrative & support | 1998 |
| Middleton Hall Trust | Arts & recreation | 2003 |
| Midland Design Group Ltd | Administrative & support | 2021 |
| Midland Design Home Improvements Ltd | Construction | 2016 |
| Midland Fabrication Ltd | Manufacturing | 2023 |
| Midland Finishing Solutions Ltd | Manufacturing | 2016 |
| Midland Fitout Ltd | Construction | 2019 |
| Midland Hydraulic Services Limited | Administrative & support | 2008 |
| Midland Leisure Supplies Ltd | Manufacturing | 2020 |
| Midland Maids Limited | Administrative & support | 2024 |
| Midland Maintenance Limited | Administrative & support | 2008 |
| Midland Mobile Leisure Services Limited | Manufacturing | 2010 |
| Midland Roof Training Group | Education | 2008 |
| Midland Solar Ltd | Construction | 2020 |
| Midland Training & Development Services Ltd | Administrative & support | 2014 |
| Midlands Architecture Ltd | Professional & scientific | 2025 |
| Midlands Climate Solutions Limited | Construction | 2018 |
| Midlands Darts Ltd | Wholesale & retail | 2024 |
| Midlands Decorative Aggregates Ltd | Wholesale & retail | 2023 |
| Midlands Electric Vehicle Charging Ltd | Construction | 2021 |
| Midlands Entertainment UK Ltd | Arts & recreation | 2015 |
| Midlands GAS & Power Limited | Energy | 2013 |
| Midlands Hot Tubs Ltd | Arts & recreation | 2016 |
| Midlands Marketing Awards Ltd | Administrative & support | 2023 |
| Midlands Motorcycle Services Ltd | Wholesale & retail | 2021 |
| Midlands Open Water Swim Ltd | Arts & recreation | 2019 |
| Midlands Snagging Limited | Construction | 2022 |
| Midlands Van Security Limited | Wholesale & retail | 2022 |
| Midlogix Ltd | Transport & logistics | 2026 |
| Midwest IT Ltd | Information & communication | 1988 |
| MIG Enterprises Limited | Health & social care | 2018 |
| Mikazuki Forest Limited | Construction | 2025 |
| Mike O'Dwyer Limited | Wholesale & retail | 2000 |
| Mike Tuck Studio Limited | Professional & scientific | 2014 |
| Mikis Nails Ltd | Other services | 2024 |
| Mile Oak Carwash Ltd | Wholesale & retail | 2025 |
| Mile Oak Garden Centre Ltd | Wholesale & retail | 2025 |
| Mile Oak Rovers Limited | Hospitality | 2026 |
| Mill Acre Development Consultancy Limited | Professional & scientific | 2020 |
| Millar Development Limited | Real estate | 1997 |
| Millard Developments Ltd | Construction | 2020 |
| Millennium Security Systems Ltd | Administrative & support | 2008 |
| Milliken Clinical Services Limited | Health & social care | 2022 |
| Mind Management for YOU Ltd | Other services | 2014 |
| Mindbridge Hub Ltd | Education | 2026 |
| Minmac Investments Ltd | Real estate | 2022 |
| Minoel Ltd | Transport & logistics | 2021 |
| Minskworks Limited | Information & communication | 2014 |
| Minster Property Developments & Finance Ltd | Financial services | 2020 |
| Mirval Ltd | Hospitality | 2024 |
| Misgi Ltd | Manufacturing | 2025 |
| Misko Car Wash Ltd | Wholesale & retail | 2026 |
| Mission Commercial Ltd | Hospitality | 2016 |
| Mitch Smith Fitness Limited | Arts & recreation | 2021 |
| Mitchell Construction & Developments Ltd | Construction | 2018 |
| Mitchells Consultancy Ltd | Professional & scientific | 2022 |
| Mitt Development Limited | Information & communication | 2016 |
| Miulian Limited | Professional & scientific | 2017 |
| MJ & CL Flanagan Limited | Professional & scientific | 2018 |
| MJ Caravan Sales Ltd | Wholesale & retail | 2014 |
| MJ Consulting (Midlands) Limited | Professional & scientific | 2025 |
| MJ Hoey Rentals Limited | Real estate | 2020 |
| MJ Network Solutions Ltd | Information & communication | 2026 |
| MJA Electrical Ltd | Construction | 2013 |
| Mjbh Ltd | Professional & scientific | 2014 |
| MJE Holdco Limited | Financial services | 2018 |
| MJE Midco Limited | Financial services | 2018 |
| MJE Plumbing Services Limited | Construction | 2011 |
| MJL Capital Limited | Information & communication | 2017 |
| MJO Business Solutions Ltd | Professional & scientific | 2020 |
| MJP Training Services Limited | Education | 2010 |
| MJR Systems Integration Limited | Information & communication | 2013 |
| MJT Automation Ltd | Manufacturing | 2021 |
| MK Contractors (Midlands) Limited | Other services | 2013 |
| MKD (Accountants) Limited | Professional & scientific | 2013 |
| MKD (Book-Keeping) Limited | Professional & scientific | 2013 |
| MKD Accountancy (UK) Limited | Professional & scientific | 2020 |
| MKD Limited | Professional & scientific | 2002 |
| Mkkg Property Limited | Real estate | 2024 |
| MLF Services Ltd | Transport & logistics | 2022 |
| Mlrk Health Ltd | Health & social care | 2021 |