| Mayga Ltd | Health & social care | 2026 |
| MAZ Service & Repair Limited | Manufacturing | 2010 |
| MB IT Solutions Ltd | Information & communication | 2022 |
| MBH Textile Ltd | Wholesale & retail | 2018 |
| MC Projects and Solutions Limited | Professional & scientific | 2023 |
| MCC Automotive Ltd | Wholesale & retail | 2023 |
| Mcculloch and Baak Holdings | Financial services | 2021 |
| Mcculloch and Baak Services | Other services | 2021 |
| Mcgoldrick & Keyes Ltd | Real estate | 2021 |
| Mcgrath Insulations Ltd | Hospitality | 2014 |
| Mcgrath Thermal Holdings Ltd | Financial services | 2025 |
| Mcgrath Thermal Ltd | Construction | 2022 |
| Mckenna Steadman Limited | Construction | 1993 |
| Mclaughlin & Daughters Limited | Financial services | 2026 |
| Mclean & Bending Ltd | Information & communication | 2020 |
| Mcoco Events Limited | Other services | 2019 |
| MCT Messages Limited | Arts & recreation | 2022 |
| Mcternan Financial Limited | Professional & scientific | 2014 |
| MDB Build Limited | Construction | 2018 |
| MDB13 Civils Ltd | Construction | 2020 |
| Mdholder Ltd | Real estate | 2020 |
| MDS Pro Team Ltd | Transport & logistics | 2019 |
| MDS@H2C-I Limited | Administrative & support | 2016 |
| MDT Interim Solutions Ltd | Professional & scientific | 2016 |
| ME Properties (Midlands) Ltd | Real estate | 2024 |
| Meadow View Court Management Limited | Households | 2007 |
| Meadowhill Property Ltd | Real estate | 2022 |
| Mech Hydro Limited | Manufacturing | 2025 |
| Mecs (Redditch) Limited | Construction | 2018 |
| Media Culture Ltd | Information & communication | 2011 |
| Mediar Europe Limited | Information & communication | 2013 |
| Mediservices Healthcare Ltd | Health & social care | 2014 |
| Meditation Trainer Ltd | Health & social care | 2023 |
| Meditor Holdings Limited | Financial services | 2019 |
| Medpart Solutions Limited | Wholesale & retail | 2017 |
| Meenaco Limited | Other services | 2017 |
| Meerkat Maintenance Company Limited | Construction | 2010 |
| Megalo Ltd | Manufacturing | 2025 |
| Melford Commercial Properties Ltd. | Extraterritorial | 1980 |
| Memhi Corporation Limited | Real estate | 2018 |
| Memona IK Limited | Hospitality | 2022 |
| Memphis Properties Limited | Real estate | 2004 |
| Menomy Ltd | Wholesale & retail | 2020 |
| Mentor Masters Ltd | Professional & scientific | 2012 |
| Meowing MAD Cat Rescue Ltd | Agriculture & fishing | 2026 |
| Merces PAY Ltd | Professional & scientific | 2025 |
| Mercia Accounting Limited | Professional & scientific | 2024 |
| Mercia Exhibitions Limited | Construction | 2020 |
| Mercia Properties Limited | Real estate | 1991 |
| Mercury H.V.A.C. Distribution Limited | Administrative & support | 2002 |
| Mercury H.V.A.C. Holdings Limited | Administrative & support | 2015 |
| Merlin Extrusion Services Limited | Manufacturing | 1995 |
| Merlin Extrusion Tool & Wire Ltd | Manufacturing | 1991 |
| Merlin Properties (Redditch) Ltd | Financial services | 2019 |
| Merlin Property Holdings Ltd | Real estate | 2014 |
| Merrett & Hall Limited | Professional & scientific | 2018 |
| Merse Property Holdings Ltd | Financial services | 2021 |
| Merse Property Ltd | Real estate | 2021 |
| Metallurgical & Technical Services Limited | Professional & scientific | 2016 |
| Metroflats Private Limited | Information & communication | 2025 |
| Mevs Home Improvements Ltd | Construction | 2022 |
| Mezztechnic Limited | Manufacturing | 2010 |
| MF Bargains Direct Ltd | Wholesale & retail | 2024 |
| Mfm-Cloud Limited | Information & communication | 2019 |
| MFW Homes Limited | Real estate | 2023 |
| MGB Transport and Removals Ltd | Transport & logistics | 2019 |
| MGP Connect Limited | Professional & scientific | 2017 |
| MGR PG Service Ltd | Manufacturing | 2011 |
| MH ISO Consultancy Ltd | Administrative & support | 2024 |
| MHS Riverside Ltd | Health & social care | 2022 |
| MI Bedrooms & Kitchens Limited | Construction | 2020 |
| Miaan G Dessert Ltd | Hospitality | 2025 |
| Mickleton Cafe Limited | Hospitality | 2023 |
| Micro Spring & Presswork Company Limited(The) | Manufacturing | 1964 |
| Midas Jewellery Limited | Wholesale & retail | 2021 |
| Middle Cottage Accounts Limited | Professional & scientific | 2003 |
| Middleton Central Heating Limited | Construction | 2003 |
| Midland Cosmetic Sales Limited | Manufacturing | 1988 |
| Midland Electrical Solar Ltd | Construction | 2026 |
| Midland Installation Solutions Limited | Construction | 2020 |
| Midland Paint & Prep Ltd | Wholesale & retail | 2023 |
| Midland Surface Heat Limited | Construction | 2023 |
| Midland Surface Heating Limited | Construction | 1999 |
| Midland Systems Limited | Information & communication | 2003 |
| Midlands Electrical Group Ltd | Construction | 2026 |
| Midlands Electrical Systems Limited | Construction | 2006 |
| Midlands Lubricants Ltd | Other services | 2013 |
| Midlands Water Hygiene Limited | Professional & scientific | 2013 |
| Midnight Hour Productions Limited | Administrative & support | 2017 |
| MIE Estate Manaegement Ltd | Real estate | 2020 |
| MIE Group Hotels Ltd | Hospitality | 2022 |
| Mieventshub Ltd | Professional & scientific | 2025 |
| Mihai Stefanescu Ltd | Other services | 2024 |
| Mike Neal & SON Limited | Manufacturing | 2016 |
| Mill Hill Design Limited | Manufacturing | 2018 |
| Mill Street Holdings Limited | Financial services | 2023 |
| Mill Street Property Limited | Real estate | 1996 |
| Mills and Sons Holdings Limited | Financial services | 2018 |
| Mills Bricklaying Services Ltd | Construction | 2024 |
| Mills Midland Ltd | Manufacturing | 2022 |