| Metricus Ltd | Professional & scientific | 2021 |
| METRIX8 Ltd | Professional & scientific | 2020 |
| Metropolitan Building Management Limited | Construction | 1986 |
| Metropolitan Developer (UK) Ltd | Professional & scientific | 2007 |
| Metropolitan Formwork Ltd | Professional & scientific | 2009 |
| Mettle Holdings Limited | Financial services | 2018 |
| MF Dickens Limited | Households | 2024 |
| Mfpc Limited Liability Partnership | | 2018 |
| MG Estate Holdings Limited | Real estate | 2021 |
| MG Financial Management Ltd | Financial services | 2022 |
| MG Pelvic Health Ltd | Other services | 2025 |
| MGL Midlands Construction & Refurbishment Ltd | Manufacturing | 2022 |
| Mgl-Five Ltd | Hospitality | 2022 |
| MGN 88 Group Ltd | Real estate | 2020 |
| MGN Consulting Ltd. | Information & communication | 2017 |
| MGN Properties Ltd | Real estate | 2020 |
| MH Assess Ltd | Health & social care | 2023 |
| MH Camera Ltd | Information & communication | 2014 |
| MH14 Ventures Ltd | Information & communication | 2026 |
| MHA10 Limited | Professional & scientific | 2020 |
| MHAPROPERTYHOLDINGS8 Ltd | Real estate | 2021 |
| Mharlin Limited | Other services | 2023 |
| MHC Accounting Services Ltd | Professional & scientific | 2023 |
| MHH Security Ltd | Administrative & support | 2015 |
| Mhmd Limited | Real estate | 2022 |
| MHP Fitness Group Limited | Arts & recreation | 2019 |
| MHP Healthcare Consultancy Ltd | Health & social care | 2020 |
| MI Medical Services Limited | Health & social care | 2010 |
| MI Pro Holdings Ltd | Financial services | 2025 |
| Mica Biosystems Limited | Professional & scientific | 2010 |
| Mica Technologies Ltd | Administrative & support | 2022 |
| Michael Bayliss Golf Ltd | Wholesale & retail | 2022 |
| Michael Burnett Ltd | Professional & scientific | 2020 |
| Michael Chefs Ltd | Hospitality | 2015 |
| Michael Day Consulting Ltd | Financial services | 2003 |
| Michael Estates Limited | Real estate | 1937 |
| Michael Food Market Limited | Wholesale & retail | 2000 |
| Michael FRY Procurement Associates Limited | Professional & scientific | 2019 |
| Michael Hanlon Limited | Health & social care | 2014 |
| Michael Mcgrath Limited | Construction | 2024 |
| Michael Seal Limited | Other services | 2011 |
| Michaels OFF Licence Ltd | Wholesale & retail | 2025 |
| Michelle and Co Catering Limited | Real estate | 1971 |
| Michelle Cobb Consultancy Limited | Financial services | 2024 |
| Michelle Oliver Consultancy Limited | Professional & scientific | 2025 |
| Mick the Skip Limited | Water & waste | 2014 |
| Microbuild (Midlands) Limited | Construction | 2016 |
| Microclimate International Limited | Information & communication | 1999 |
| Microkernel Ltd | Information & communication | 2020 |
| Micromak Limited | Professional & scientific | 2017 |
| Microplatforms Ltd | Information & communication | 2015 |
| Microscope Servicing Limited | Professional & scientific | 2016 |
| Mid-Star Limited | Extraterritorial | 2023 |
| Midcal Limited | Professional & scientific | 2012 |
| Middle Earth Garden Services Ltd | Administrative & support | 2026 |
| Middleton Communications Ltd | Professional & scientific | 2022 |
| Middleton High Performance Consulting Limited | Professional & scientific | 2023 |
| Midhire Self Drive Rentals Limited | Administrative & support | 1992 |
| Midland Business Equipment Limited | Wholesale & retail | 1997 |
| Midland Car Spares Limited | Wholesale & retail | 2009 |
| Midland Cleaning & Maintenance Limited | Administrative & support | 2002 |
| Midland Commercial Environmental Services Limited | Construction | 1991 |
| Midland Cooling Ltd | Manufacturing | 2011 |
| Midland Cruise Club Limited | Extraterritorial | 2001 |
| Midland Digital Installations Ltd | Construction | 2014 |
| Midland Electrical Group Ltd | Construction | 2014 |
| Midland EYE Holdings Limited | Health & social care | 2021 |
| Midland Flyfishers Limited | Arts & recreation | 1959 |
| Midland Glassworks Limited | Construction | 2025 |
| Midland Intensive Care Limited | Health & social care | 2014 |
| Midland Lyons Holdings Limited | Administrative & support | 2020 |
| Midland Masonic Limited | Manufacturing | 2006 |
| Midland Master Minds Ltd | Information & communication | 2024 |
| Midland Racing Partnership Limited | Extraterritorial | 2018 |
| Midland Roofing Solutions Ltd | Construction | 2022 |
| Midland Shoulder Surgeon Ltd | Health & social care | 2020 |
| Midland Sky Services Ltd | Other services | 2018 |
| Midland Vehicle Assessments Limited | Professional & scientific | 2019 |
| Midland Woodworks Limited | Construction | 2015 |
| Midland Youth Jazz Orchestra Association Limited | Arts & recreation | 1997 |
| Midlandride Ltd | Transport & logistics | 2026 |
| Midlands Advanced Gynaecological Surgery Limited | Health & social care | 2015 |
| Midlands Air Training School Limited | Professional & scientific | 1978 |
| Midlands Automotive Customs Ltd | Wholesale & retail | 2020 |
| Midlands Construction & Groundworks Limited | Construction | 2020 |
| Midlands Construction & Groundworks Services Limited | Construction | 2024 |
| Midlands Facilities Management Ltd | Administrative & support | 2011 |
| Midlands Flat Roofing Ltd | Construction | 2019 |
| Midlands Food Group Ltd | Hospitality | 2023 |
| Midlands GAS & Electrical Limited | Construction | 2023 |
| Midlands Haematology Training Services Limited | Education | 2021 |
| Midlands Healthy Horizons Limited | Public administration | 2013 |
| Midlands Home & Energy Inspections Limited | Information & communication | 2008 |
| Midlands Homebuyers Ltd | Real estate | 2021 |
| Midlands Luxury Lets Ltd | Real estate | 2025 |
| Midlands Performance Tyres Ltd | Wholesale & retail | 2017 |
| Midlands Property Portfolio Limited | Real estate | 2019 |
| Midlands Quantity Surveyors Limited | Professional & scientific | 2017 |
| Midlands Shutters Limited | Manufacturing | 2024 |
| Midlands Ultrasound & Medical Services (Mums) Ltd. | Health & social care | 2003 |