| Meat in the Box Ltd | Manufacturing | 2020 |
| MED DEV Services Ltd | Health & social care | 2024 |
| Medapt Limited | Health & social care | 2014 |
| Medconsult Limited | Health & social care | 2023 |
| Meddings & Co Limited | Water & waste | 2000 |
| Mediation and Legal Consultancy Limited | Administrative & support | 2013 |
| Medical Accident Group Limited | Administrative & support | 2001 |
| Medical Assurance Bureau (Midlands) Limited | Financial services | 2007 |
| Medicall Europe Limited | Wholesale & retail | 2024 |
| Medilogik Limited | Information & communication | 2008 |
| Medo Catering Ltd | Hospitality | 2024 |
| Medphys Health Solutions Limited | Health & social care | 2025 |
| Medsupply Innovations Limited | Manufacturing | 2025 |
| Medvale Engineering Limited | Professional & scientific | 1979 |
| Meemu Maths Ltd | Education | 2015 |
| Meet ME in the Morning Limited | Extraterritorial | 2024 |
| Meggie Composites Ltd | Manufacturing | 2023 |
| Mehrbans Ltd | Construction | 2025 |
| MEI MEI (U.K.) Limited | Real estate | 2002 |
| Mejebaba Properties Ltd | Real estate | 2026 |
| Mejebaba TC Ltd | Wholesale & retail | 2026 |
| Melissa Wilkes Ltd | Wholesale & retail | 2019 |
| Mellstock Associates Limited | Information & communication | 2005 |
| Melmat Energy Solutions Ltd | Construction | 2026 |
| Melvyn Rowberry Specialist Services Limited | Professional & scientific | 2012 |
| Memorials of Worcester Ltd | Manufacturing | 2010 |
| Mend and Maintain Property Care Ltd | Construction | 2025 |
| MER Property Limited | Real estate | 2021 |
| Merbach Consulting Limited | Professional & scientific | 2022 |
| Mercia Homes Limited | Construction | 2015 |
| Mercia Syndicate Ltd | Administrative & support | 2025 |
| Mercian Asphalt Limited | | 1973 |
| Mercian Events Ltd | Professional & scientific | 2006 |
| Merct Consulting Limited | Professional & scientific | 2014 |
| Mere Green Head Office Services Limited | Professional & scientific | 2019 |
| Meredith Management Services Ltd | Professional & scientific | 2022 |
| Meredith Unsworth Limited | Other services | 2007 |
| Merlin Corporate Solutions Limited | Professional & scientific | 2002 |
| Merlin Money Limited | Professional & scientific | 2002 |
| Mermaid Holdings Ltd | Financial services | 2026 |
| Merrell & Bibby Building Contractors Ltd | Construction | 2017 |
| Merrimans Close (Holdings) Limited | Households | 2017 |
| Merston Peters Consultants Limited | Administrative & support | 1999 |
| Merston Peters Limited | Administrative & support | 1987 |
| Merthyr Tydfil Football Club Limited | Arts & recreation | 1998 |
| Mertonhall Limited | Households | 2022 |
| Mesmer Jewellery Limited | Wholesale & retail | 2017 |
| Mesnil Limited | Administrative & support | 1996 |
| Metallion Investments Ltd | Real estate | 2023 |
| Mexicana Ventures Limited | Administrative & support | 2024 |
| Mezger Engineering Limited | Professional & scientific | 2025 |
| MF Sport Enterprise Ltd | Arts & recreation | 2024 |
| MFH Investments Limited | Administrative & support | 2013 |
| Mforce Forward Ltd | Professional & scientific | 2026 |
| MG Right Solutions Ltd | Administrative & support | 2024 |
| MGC Carpets Ltd | Wholesale & retail | 2012 |
| MGC Investment Holdings Limited | Financial services | 2023 |
| MGF Grower Services Limited | Administrative & support | 2008 |
| MGP Steel Fixing Ltd | Construction | 2020 |
| MHB Advisory Limited | Professional & scientific | 2024 |
| MHF (UK) Limited | Manufacturing | 1992 |
| MIC Electrical Engineering Ltd | Construction | 2026 |
| Micam Limited | Manufacturing | 2000 |
| Michael Cross Ltd | Financial services | 2026 |
| Michele Fitzpatrick Ltd | Education | 2016 |
| Mick Waters Educational Associates Ltd | Professional & scientific | 2023 |
| Micm Transport Ltd | Transport & logistics | 2019 |
| Microll Engineering Ltd | Manufacturing | 2024 |
| Microtechnic Solutions Limited | Information & communication | 2007 |
| Middle Hollow Court Management Limited | Households | 2015 |
| Middlecott Holdings Limited | Real estate | 2025 |
| Middling Creative CIC | Information & communication | 2025 |
| Midi-Builds Limited | Construction | 2014 |
| Midland Automation Technology Limited | Professional & scientific | 1993 |
| Midland Commercial Refurbishment Limited | Construction | 2017 |
| Midland Commercials (Worcs) Limited | Wholesale & retail | 2018 |
| Midland Commercials Limited | Other services | 2003 |
| Midland Crusher Hire Limited | Construction | 2026 |
| Midland Endocrine and Osteoporosis Limited | Professional & scientific | 2011 |
| Midland Hill Climb Championship (2017) Limited | Other services | 2017 |
| Midland Mobile Communications Ltd | Financial services | 1997 |
| Midland Provincial Farms Limited | Agriculture & fishing | 2014 |
| Midland Road Studios Limited | Administrative & support | 2013 |
| Midland Rolling and Haulage Co. Ltd | Professional & scientific | 2021 |
| Midland Safety Advice Services Limited | Other services | 2007 |
| Midland Technical Translations (UK) Limited | Professional & scientific | 2003 |
| Midland Van Centre Ltd | Wholesale & retail | 2011 |
| Midland Wheels and Accessories Ltd | Wholesale & retail | 2025 |
| Midlands Gospel Mission (International) | Other services | 2013 |
| Midlands Racehorse Rehabilitation Ltd | Agriculture & fishing | 2022 |
| Midlife Classics Ltd | Other services | 2016 |
| Midshire Farms Limited | Agriculture & fishing | 2024 |
| Midspace Property Management Limited | Households | 1988 |
| Midwest Landscaping Limited | Construction | 2000 |
| Midwest Stairs Ltd | Manufacturing | 2024 |
| MIF Distributions Limited | Manufacturing | 2003 |
| Migpm Ltd | Professional & scientific | 2026 |
| Mike Riddell IFA Limited | Financial services | 2019 |
| Milad Decorators Limited | Construction | 2016 |
| Milano Developments Ltd | Real estate | 2025 |