| Manveer Lally Ltd | Wholesale & retail | 2025 |
| Marc Bright Ltd | Professional & scientific | 2022 |
| Maria Mills Limited | Administrative & support | 2012 |
| Marigold Meat Company Ltd | Wholesale & retail | 2026 |
| Mark Smith Enterprises Ltd | Construction | 2018 |
| Marketpro WM Limited | Information & communication | 2024 |
| Marlou Limited | Real estate | 2002 |
| Marluk Garage Ltd | Wholesale & retail | 2024 |
| Marren Devine Catering Services Ltd | Hospitality | 2022 |
| Martin Motor Services Limited | Wholesale & retail | 1992 |
| Mascot Properties Ltd | Construction | 2023 |
| Mashiah House Ltd | Health & social care | 2020 |
| Masterlease Care Limited | Wholesale & retail | 2010 |
| Matoon Ltd | Administrative & support | 2017 |
| Mattia Transport Limited | Transport & logistics | 2016 |
| Mattia's Property Ltd | Real estate | 2020 |
| Mattu Transport Ltd | Transport & logistics | 2024 |
| MB Automation Limited | Professional & scientific | 1996 |
| MB Motors Service Ltd | Wholesale & retail | 2021 |
| Mbizi Property Solutions Ltd | Real estate | 2019 |
| MC Plastering Ltd | Construction | 2024 |
| Mc&E Cleaning Service Ltd | Administrative & support | 2025 |
| Mcambs Ltd | Construction | 2019 |
| MCD Property Renovations Limited | Construction | 2026 |
| ME and Mine Creations Limited | Manufacturing | 2025 |
| Meal Deal Cafe Limited | Administrative & support | 2025 |
| MEC Drylining Ltd | Construction | 2015 |
| Medellin Auto Services & Repairs Limited | Water & waste | 2024 |
| Medhini Siri Ltd | Wholesale & retail | 2020 |
| Mediterranean Fish Bar Limited | Hospitality | 2025 |
| Mega Hope International Ltd | Other services | 2025 |
| Mega Hope Ltd | Education | 2025 |
| Menfor Construction Ltd | Administrative & support | 2017 |
| Menfor Construction Services Limited | Construction | 2016 |
| Menfor Group Ltd | Professional & scientific | 2005 |
| Menfor Services Limited | Construction | 2014 |
| Mentorbusiness.Com Ltd | Professional & scientific | 2025 |
| Mentoring West Midlands Community Interest Company | Health & social care | 2012 |
| Mercia Electromec Limited | Construction | 2021 |
| Mercia Green Solutions Ltd | Manufacturing | 2024 |
| Mercia Group International Limited | Manufacturing | 2024 |
| Mercia Group Services Ltd | Manufacturing | 2024 |
| Mercia Industrial Doors Limited | Manufacturing | 2006 |
| Mercia Lifting Gear Limited | Manufacturing | 1982 |
| Mercia Nano Solutions Ltd | Manufacturing | 2024 |
| Meridien Group Limited | Construction | 2018 |
| Mezzo Ltd | Wholesale & retail | 2016 |
| MG Concrete Flooring Ltd | Construction | 2025 |
| Mgbd Services Ltd | Wholesale & retail | 2023 |
| MHP Lettings Ltd | Real estate | 2021 |
| MI Trophy Ltd | Wholesale & retail | 2016 |
| Middleton Food Products Limited | Wholesale & retail | 1990 |
| Middleton Group Limited | Real estate | 1997 |
| Middleton Paper Company Limited | Manufacturing | 1976 |
| Midland Bargains Ltd | Wholesale & retail | 2025 |
| Midland Brickwork (2020) Limited | Construction | 2020 |
| Midland Chilled Foods Limited | Wholesale & retail | 1973 |
| Midland Logistics Ltd | Transport & logistics | 2025 |
| Midland Motascreens Limited | Wholesale & retail | 2010 |
| Midland Parcel Services Ltd | Transport & logistics | 2022 |
| Midlands Airport Travel Ltd | Transport & logistics | 2023 |
| Midlands Direct Cremation Ltd | Other services | 2024 |
| Midlands Executive Travel Ltd | Transport & logistics | 2023 |
| Midlands Fabrication Ltd | Construction | 2025 |
| Midlands Freight Ltd | Transport & logistics | 2022 |
| Midlands Nominees Ltd | Real estate | 2019 |
| Midlands Paints Limited | Wholesale & retail | 2023 |
| Midlands Plate Prints Ltd | Manufacturing | 2016 |
| Midlands Properties Limited | Real estate | 2000 |
| Midlands Property and Lettings Ltd | Real estate | 2025 |
| Midlands ROOFING1 Ltd | Construction | 2023 |
| Midlands Trade Motors Ltd | Wholesale & retail | 2025 |
| Midlands Transport Consultants Limited | Professional & scientific | 2025 |
| Midlands Willows Ltd | Wholesale & retail | 2021 |
| Midwest Signs Ltd | Manufacturing | 2019 |
| Millenium Express Ltd | Transport & logistics | 2017 |
| Millstock Stainless Limited | Wholesale & retail | 1996 |
| Millvale Engineering Limited | Wholesale & retail | 1999 |
| Millvale House Ltd | Wholesale & retail | 2019 |
| Mind Development Ltd | Education | 2022 |
| Mirrored Squares Ltd | Wholesale & retail | 2024 |
| Miss Tiptop Limited | Wholesale & retail | 2016 |
| Mixsingh Experience Limited | Arts & recreation | 2018 |
| Mjbf Construction Ltd | Construction | 2016 |
| MJP Automotive Limited | Wholesale & retail | 2024 |
| MJP Motorsports Limited | Wholesale & retail | 2024 |
| Mkheswa Limited | Public administration | 2018 |
| MKM Engineering Limited | Manufacturing | 2006 |
| MKR Builders Ltd | Construction | 2023 |
| MKR Estates Ltd | Real estate | 2024 |
| MKS & PSS Investments Ltd | Real estate | 2020 |
| Ml&Son Trans Ltd | Transport & logistics | 2023 |
| MLB Products Limited | Manufacturing | 2018 |
| MMS Deals Ltd | Wholesale & retail | 2019 |
| MMS Logistics Limited | Transport & logistics | 2015 |
| Mobile Communications Installation Services Limited | Information & communication | 2003 |
| Mochi Nails Ltd | Other services | 2026 |
| Modus Vivendi Associates Limited | Information & communication | 2012 |
| Moja Clothing Ltd | Wholesale & retail | 2019 |
| Molbee Properties Ltd | Real estate | 2022 |