| Midland Networks Installs Limited | Information & communication | 2017 |
| Midland Nose Surgery Limited | Health & social care | 2017 |
| Midland Office Services Limited | Wholesale & retail | 1985 |
| Midland OIL Group Limited | Manufacturing | 2023 |
| Midland Properties (West Midlands) Limited | Construction | 1974 |
| Midland Prototyping Ltd | Manufacturing | 2020 |
| Midland Roofing & Property Maintenance Ltd | Construction | 2019 |
| Midland Sealants and Tools Limited | Construction | 2015 |
| Midland Telecom Ltd | Information & communication | 2025 |
| Midland Telecom Networks Group Ltd | Information & communication | 2024 |
| Midland Training Academy Limited | Education | 2025 |
| Midlands Biomass Fuels Limited | Construction | 2017 |
| Midlands Business Centre Limited | Administrative & support | 2006 |
| Midlands Cargo Surveys Ltd | Financial services | 2025 |
| Midlands Floor Supplies Ltd | Construction | 2026 |
| Midlands Motor Care Limited | Wholesale & retail | 2008 |
| Midlands Training Limited | Administrative & support | 2012 |
| Midlands Wedding DJ Ltd | Information & communication | 2024 |
| Midminster Holdings Limited | Real estate | 1963 |
| Midminster Properties Limited | Professional & scientific | 1991 |
| Miffy & James Limited | Construction | 2014 |
| Mighty Maids Ltd | Administrative & support | 2022 |
| Mighty Recycling UK Ltd | Wholesale & retail | 2024 |
| Mikcal Financial Services Limited | Professional & scientific | 2017 |
| Miksu Developments Limited | Professional & scientific | 2022 |
| Milano Home Improvement Ltd | Construction | 2022 |
| Miles Trading Limited | Wholesale & retail | 2017 |
| Millard Electrical Services Ltd | Construction | 2021 |
| Miller Rose Investments Ltd | Real estate | 2025 |
| Milling Trade Ltd. | Wholesale & retail | 2011 |
| Milnatney Ltd | Public administration | 2021 |
| Mindsways Limited | Professional & scientific | 2016 |
| Minerva.Science Limited | Information & communication | 2016 |
| Miniature Pressure Gauge Limited | Manufacturing | 2002 |
| Minifyme UK Ltd | Hospitality | 2020 |
| Miracell Homecare Limited | Health & social care | 2024 |
| Miracell Ltd | Wholesale & retail | 2020 |
| Mirage Bingo Limited | Arts & recreation | 2006 |
| Mirage Leisure Limited | Arts & recreation | 1993 |
| Mirage Leisure UK Limited | Extraterritorial | 2002 |
| Mirage Property Services Limited | Real estate | 2006 |
| Mirror Development & Training Limited | Professional & scientific | 2007 |
| Mish Technologies Ltd | Information & communication | 2016 |
| Mishas Beauty Salon Ltd | Other services | 2021 |
| Misite Limited | Information & communication | 2025 |
| MJ Sections Aerospace Group Limited | Manufacturing | 2010 |
| MJB Electrical Services Ltd | Construction | 2019 |
| MJK Properties Limited | Real estate | 2000 |
| MJW Recreation Limited | Construction | 2010 |
| MKM Diaspora Welfare -UK Chapter Community Interest Company | Health & social care | 2019 |
| ML Surveying and Building Services Ltd | Construction | 2024 |
| MLA Lifts Ltd | Construction | 2021 |
| MLA Real Properties Ltd | Real estate | 2024 |
| MMO Pubs Ltd | Hospitality | 2024 |
| Mmuliku-Ebusiness Ltd | Wholesale & retail | 2024 |
| Mnro Construction Ltd | Construction | 2024 |
| Mobileworxs Limited | Information & communication | 2006 |
| Mode Sensors Limited | Manufacturing | 2019 |
| Model Design & Manufacture Limited | Administrative & support | 2005 |
| Modulemenders Ltd | Wholesale & retail | 2025 |
| Mogul Stone Limited | Extraterritorial | 2004 |
| Mohali Dining Ltd | Hospitality | 2024 |
| Mohin K Ltd | Real estate | 2016 |
| Momentum Training and Development Ltd | Professional & scientific | 2009 |
| Monarch Holdings Ltd | Real estate | 2022 |
| Moneywatch Finance PWH Limited | Financial services | 2015 |
| Monga Consultancies Ltd | Administrative & support | 2020 |
| Monikanimmi Limited | Wholesale & retail | 2020 |
| Monirail Ltd | Professional & scientific | 2019 |
| Monokeros Limited | Information & communication | 2025 |
| Monster Mash Limited | Manufacturing | 2005 |
| Moody Terrace Dental Practice Limited | Health & social care | 2007 |
| Moonfolk Ltd | Wholesale & retail | 2019 |
| Moor Pool and Snooker Limited | Arts & recreation | 2013 |
| More Personnel Ltd | Administrative & support | 2023 |
| Morgans Machinery Limited | Manufacturing | 1991 |
| Morning DEW Trade Ltd | Wholesale & retail | 2024 |
| Morris Psychological Services Ltd | Education | 2016 |
| Morrison Developments (Midlands) Limited | Real estate | 2017 |
| Mosh Consulting Limited | Information & communication | 2025 |
| Mount Developments (Shrewsbury) Ltd | Construction | 2016 |
| Mount Trading Company Limited | Wholesale & retail | 1987 |
| Mountain Orchid Limited | Real estate | 2016 |
| Mowa Construct Ltd | Construction | 2023 |
| MP 2008 Limited | Real estate | 2018 |
| MPD Ltd. | Real estate | 1958 |
| Mpharmu Limited | Wholesale & retail | 2022 |
| Mpjp Consultancy Ltd | Professional & scientific | 2025 |
| MPM Mario Property Maintenance Ltd | Construction | 2016 |
| MPS Electrical (UK) Limited | Construction | 2014 |
| MR CAD LLP | | 2022 |
| MR Shakes Dessert Ltd | Wholesale & retail | 2024 |
| MR. M. Shoaib Limited | Health & social care | 2010 |
| MRK Engineering Solutions Ltd | Manufacturing | 2022 |
| MRK Medical Limited | Health & social care | 2023 |
| MS Supplies Ltd | Wholesale & retail | 2025 |
| MSB Retail Stores Ltd | Wholesale & retail | 2023 |
| MSC Auto Services Ltd | Wholesale & retail | 2019 |
| MSG Squared Limited | Real estate | 2017 |
| MSV Estates Limited | Administrative & support | 2025 |