| Midlands Barber & Beauty Supplies Ltd | Other services | 2019 |
| Midlands Corporation Ltd | Transport & logistics | 2026 |
| Midlands Fitted Wardrobes Ltd | Manufacturing | 2021 |
| Midlands Leisure Ltd | Other services | 2016 |
| Midlands Lighting Ltd | Wholesale & retail | 2024 |
| Midlands LPG Ltd | Wholesale & retail | 2020 |
| Midlands Textile Limited | Wholesale & retail | 2010 |
| Midlands Urban Recycling Ltd | Water & waste | 2016 |
| Midnight Parts Limited | Wholesale & retail | 2025 |
| Midwest Hospitality Ltd | Hospitality | 2020 |
| Mieleous Limited | Professional & scientific | 2020 |
| Milan Transport Services Ltd | Transport & logistics | 2026 |
| Milesdrop Limited | Transport & logistics | 2026 |
| Milford Memorials and Headstones Ltd. | Other services | 2011 |
| Millbank Property Developments Limited | Real estate | 2003 |
| Millennium Assemblies Limited | Manufacturing | 2014 |
| Millennium Dwellings Ltd | Real estate | 2026 |
| Millennium Manufacturing Group Limited | Extraterritorial | 2015 |
| Millennium Metal Fabrications Limited | Extraterritorial | 2016 |
| Millennium Pressed Metal Limited | Manufacturing | 2002 |
| Millennium Pressings Limited | Manufacturing | 2008 |
| Millersdale Properties Ltd | Real estate | 2025 |
| Millies Foundation | Other services | 2008 |
| Mima Forklifts UK Limited | Wholesale & retail | 2025 |
| Minava Ltd | Health & social care | 2023 |
| Minco Marketing Ltd | Professional & scientific | 2020 |
| Mindspring Tuition Ltd | Education | 2025 |
| Minenhle Limited | Health & social care | 2021 |
| Minhas Brothers Transport Ltd | Transport & logistics | 2023 |
| Mirage Capital Management Limited | Extraterritorial | 2016 |
| Mirage Distribution Limited | Wholesale & retail | 2009 |
| Mirage Pharma Ltd | Wholesale & retail | 2019 |
| Miro Jewellery UK Ltd | Other services | 2024 |
| Mitta Limited | Construction | 2026 |
| MJ Midlands Services Ltd | Transport & logistics | 2014 |
| MJ Streetcloud Ltd | Wholesale & retail | 2025 |
| MJM Double Glazing Ltd | Construction | 2020 |
| MJR Properties Limited | Real estate | 2020 |
| MJS Construction Solutions Ltd | Construction | 2017 |
| MJS Global Services Ltd | Real estate | 2024 |
| MJS Property MID Ltd | Real estate | 2025 |
| MK Auto Performance Ltd | Other services | 2018 |
| MK Distribution Ltd | Wholesale & retail | 2023 |
| MK Drinks Limited | Wholesale & retail | 2025 |
| MK Hiring Ltd | Hospitality | 2024 |
| MK Kitchen Limited | Hospitality | 2024 |
| MK& K Limited | Real estate | 2026 |
| MKA Ltd | Information & communication | 2019 |
| MKR Autos Ltd | Wholesale & retail | 2022 |
| Mksn Services Ltd | Financial services | 2024 |
| ML Foundation CIC | Hospitality | 2021 |
| MM Healthcare Locum Services Limited | Health & social care | 2018 |
| MMK Leisure Limited | Administrative & support | 2016 |
| MML Venture Limited | Health & social care | 2025 |
| MMM Solutions Ltd | Construction | 2019 |
| MMS Works Limited | Construction | 2023 |
| MNJ Kitchens Ltd | Hospitality | 2025 |
| Mobile Barbering Limited | Other services | 2019 |
| Mobile Craze Ltd | Wholesale & retail | 2019 |
| Mobile Expert Ltd | Wholesale & retail | 2022 |
| Mobile Junction Ltd | Wholesale & retail | 2019 |
| Mobilise, Manifest & Soar Academy CIC | Information & communication | 2025 |
| Mocanu Trans Limited | Transport & logistics | 2025 |
| Mocsi Ltd | Administrative & support | 2025 |
| Mogeje Ltd | Financial services | 2022 |
| Mohali Foods Ltd | Hospitality | 2023 |
| Mohs Workplace Health Limited | Health & social care | 1962 |
| Mojoo Limited | Wholesale & retail | 2000 |
| Molly House Media Ltd | Information & communication | 2024 |
| Monarch Automotive Group Ltd | Wholesale & retail | 2026 |
| Mondo Mondo Ltd | Real estate | 2024 |
| Moneysavers Limited | Wholesale & retail | 2006 |
| Mongoose Optics Limited | Health & social care | 2023 |
| Monolith Haus Ltd. | Information & communication | 2016 |
| Montana Corporate Finance Limited | Financial services | 2004 |
| Montana-Rhodes Limited | Financial services | 2020 |
| Moonlight Community Centre | Arts & recreation | 2018 |
| Moonlight Development Care Ltd | Health & social care | 2016 |
| Moorgate Group Limited | Administrative & support | 2021 |
| Morden Windows Ltd | Construction | 2023 |
| Morgan Payne and Knightly Sandwell Limited | Real estate | 2021 |
| Morlivco Limited | Wholesale & retail | 2019 |
| Morten Home Improvements Ltd | Construction | 2025 |
| Moss Office Supplies Limited | Extraterritorial | 2002 |
| Motion Hause Limited | Information & communication | 2026 |
| Motive Travel Ltd | Transport & logistics | 2025 |
| Motor Hub Birmingham Limited | Wholesale & retail | 2025 |
| MOTV8 Limited | Information & communication | 2012 |
| Moubray Gardens Management Company Limited | Households | 2025 |
| Move Forward Midlands Ltd | Transport & logistics | 2023 |
| Movement Travels Ltd | Transport & logistics | 2023 |
| Movements and Moments CIC | Education | 2024 |
| Mpbs - Facility Management Ltd | Construction | 2015 |
| Mpbs - Interiors Ltd | Construction | 2020 |
| Mpbs Security Ltd | Administrative & support | 2020 |
| MR and MRS London Ltd | Manufacturing | 2019 |
| MR Gill Transport Ltd | Transport & logistics | 2024 |
| MR Karol Krupa Ltd | Extraterritorial | 2023 |
| MR Singh Kitchen & Bedrooms Ltd | Other services | 2024 |
| MR Singh Recruitment Ltd | Administrative & support | 2024 |