| Midlands Merchendise Ltd | Wholesale & retail | 2025 |
| Midlands Motor Zone Ltd | Wholesale & retail | 2025 |
| Midlands Poultry Products Ltd | Manufacturing | 2022 |
| Midlands Prestige Motors Ltd | Wholesale & retail | 2025 |
| Midlands Pro DJ Limited | Other services | 2008 |
| Midlands Property Developments Limited | Real estate | 2013 |
| Midlands Restoration Holdings Limited | Financial services | 2025 |
| Midlands Restoration Limited | Construction | 2004 |
| Midlands Secretarial Management Limited | Administrative & support | 1992 |
| Midlands Security Services (UK) Limited | Administrative & support | 2026 |
| Midlands Simit Ltd | Other services | 2021 |
| Midlands Single PLY Roofing Ltd | Construction | 2020 |
| Midlands Solar Installations Ltd | Construction | 2022 |
| Midleton Developments (Church Street) Limited | Construction | 2022 |
| Midlife Food Guru Limited | Hospitality | 2015 |
| Midnight Mums Club Ltd | Information & communication | 2025 |
| Midpoint Projects Limited | Construction | 2007 |
| Mids Group Ltd | Construction | 2024 |
| Midship Vehicle Hire Limited | Transport & logistics | 2013 |
| Midway Cleaning Services Limited | Administrative & support | 2003 |
| Midway Property Maintenance Services Ltd | Administrative & support | 2026 |
| Midwest M & E Services Ltd | Construction | 2017 |
| Midwest Mechanical and Electrical Services Limited | Construction | 1988 |
| Midwifex Ltd | Health & social care | 2025 |
| MIF Group of Companies Limited | Construction | 2020 |
| Might Ballers Ltd | Education | 2025 |
| Mighty Support Services Ltd | Other services | 2025 |
| Migra Ltd | Construction | 2020 |
| Migrant Immigration Services Ltd | Other services | 2023 |
| Migration Advice Services Ltd | Other services | 2021 |
| Mihxa Group Ltd | Wholesale & retail | 2021 |
| Miir Ltd | Professional & scientific | 2017 |
| Mikail Zahiri Ltd | Wholesale & retail | 2023 |
| Mikal Transport Ltd | Transport & logistics | 2024 |
| Mikarjun 120 Ltd | Real estate | 2024 |
| Mike's Motors Garage Ltd | Wholesale & retail | 2021 |
| Mikeey Ltd | Wholesale & retail | 2026 |
| Mikejay Limited | Health & social care | 2021 |
| Mikhail and Galina Ltd | Transport & logistics | 2022 |
| Milan Holdco Limited | Construction | 2019 |
| Milan's Gold Ltd | Wholesale & retail | 2023 |
| Milano Pizza & Grills Ltd | Hospitality | 2020 |
| Milans Property Limited | Real estate | 2026 |
| Mild ND Spicy Curry House Limited | Hospitality | 2025 |
| Miles Better Property Ltd | Real estate | 2022 |
| Miles Brothers (Saredon) Limited | | 1964 |
| Milestone Coaching and Consulting Ltd | Transport & logistics | 2010 |
| Mill Bay Holdings Ltd | Arts & recreation | 2021 |
| Mill Farm Organics Ltd | Extraterritorial | 2011 |
| Mill Lane Management (Tettenhall Wood) Limited | Real estate | 2016 |
| Mill Ride Country Sports Limited | Arts & recreation | 1984 |
| Mill Street Audio Ltd | Manufacturing | 2018 |
| Millard Properties SPV Limited | Real estate | 2025 |
| Millbrook Developments (Midlands) Limited | Construction | 2017 |
| Millennium Properties (Letting Agents) Limited | Real estate | 2000 |
| Miller's Reach RTM Company Limited | Households | 2024 |
| Millfields (Albrighton) Management Company Limited | Households | 2024 |
| Millfields III Limited | Construction | 2023 |
| Millie's Books Ltd | Wholesale & retail | 2025 |
| Millionhair & Beauty Ltd | Other services | 2018 |
| Milst Ltd | Administrative & support | 2024 |
| Mime&Co Services Ltd | Professional & scientific | 2019 |
| Mimilee Ltd | Professional & scientific | 2025 |
| Minara Ventures Ltd | Administrative & support | 2026 |
| Mind by JB CIC | Other services | 2025 |
| Mind Escape Wellbeing Limited | Health & social care | 2025 |
| Mind Merge Solutions Ltd | Energy | 2026 |
| Mindloomai Limited | Information & communication | 2025 |
| Mindloop Solutions Ltd | Information & communication | 2025 |
| Mindshare Hub | Education | 2024 |
| Mineral Estate Management Limited | Mining & quarrying | 2019 |
| Minett Consultancy Ltd | Professional & scientific | 2010 |
| Ming Shing Kitchen Cabinet Designer Ltd | Manufacturing | 2025 |
| Minhas & Kaur Ltd | Real estate | 2020 |
| Minhas Construction and Contractors Ltd | Construction | 2026 |
| Mini Mart Wolverhampton Limited | Wholesale & retail | 2023 |
| Mini ME Minds Ltd | Education | 2025 |
| Mini Punch Limited | Other services | 2016 |
| Minimal Brands Ltd | Wholesale & retail | 2024 |
| Minnietoots Ltd | Wholesale & retail | 2026 |
| Mint Audio Ltd | Wholesale & retail | 2025 |
| Mint Sky Limited | Real estate | 2019 |
| Mintsavvy Ltd | Transport & logistics | 2019 |
| Minzsima Limited | Real estate | 2018 |
| MIP Global Group Ltd | Wholesale & retail | 2024 |
| Mipbuilds Ltd | Construction | 2024 |
| Mipha Srvices Ltd | Health & social care | 2022 |
| Miracle (UK) Ltd | Transport & logistics | 2014 |
| Miracle Community Housing CIC | Hospitality | 2024 |
| Miracle Eyes Limited | Health & social care | 2005 |
| Miracle Property Holdings Limited | Real estate | 2017 |
| Miracle Property Solutions Ltd | Real estate | 2014 |
| Miracle Social Care Ltd | Real estate | 2020 |
| Miracle Soft Solutions Ltd | Information & communication | 2025 |
| Mirage Sport Spain Ltd | Construction | 2017 |
| Miri Piri Ltd | Real estate | 2025 |
| Miriam Jaimes Limited | Real estate | 2023 |
| Miro Express Limited | Transport & logistics | 2015 |
| Miro Solutions Ltd | Wholesale & retail | 2025 |
| Mirpuri Foods Ltd | Hospitality | 2023 |