| MEDISTAFF24 Ltd | Administrative & support | 2017 |
| Mega Auto Manual Ltd | Wholesale & retail | 2020 |
| MEI EMI Limited | Professional & scientific | 2026 |
| Mellow Works Limited | Professional & scientific | 2025 |
| Mennos Limited | Transport & logistics | 2019 |
| Merbridge Limited | Information & communication | 2024 |
| Merralls Consulting Limited | Professional & scientific | 2011 |
| Metadatis Ltd | Information & communication | 2014 |
| Metropolitan Systems Limited | Professional & scientific | 2003 |
| Mette Lacey Marketing Ltd | Administrative & support | 2023 |
| Mexa Corp Limited | Information & communication | 2025 |
| MFF 2013 Limited | Extraterritorial | 2013 |
| MFL Associates Limited | Financial services | 2012 |
| MGB Sheds Limited | Manufacturing | 2007 |
| MGD Enterprises Limited | Construction | 2017 |
| MGS Surveying Limited | Professional & scientific | 2011 |
| MHH Engineering Ltd | Construction | 2017 |
| MHW Aesthetics Ltd | Health & social care | 2026 |
| Miamax Design Ltd | Professional & scientific | 2020 |
| Michael Gibson Associates Limited | Real estate | 1973 |
| Michael Hartnell Nurseries Ltd | Agriculture & fishing | 2024 |
| Michael L Adams Ltd | Professional & scientific | 2011 |
| Michael Simpson Associates Limited | Professional & scientific | 2004 |
| Michael Williams Financial Services Ltd | Financial services | 2004 |
| Middlicott & Sullivan Limited | Construction | 2021 |
| Middlicott Properties Limited | Real estate | 2019 |
| Midfield Holdings Limited | Financial services | 2003 |
| Midfield Motors Limited | Construction | 1976 |
| Midfield Properties Limited | Construction | 2003 |
| Midland Air Testing Limited | Professional & scientific | 2017 |
| Midland Retail Stores Limited | Wholesale & retail | 2012 |
| Midlands Auctions Ltd | Real estate | 2025 |
| Midlands Sewer Maintenance Limited | Water & waste | 2015 |
| Midwinter Physiotherapy Limited | Health & social care | 2024 |
| Mihaela & George Limited | Transport & logistics | 2025 |
| Mika Digital Limited | Professional & scientific | 2024 |
| Mike Burgess Design Ltd | Professional & scientific | 2022 |
| Mike Latham & Co Limited | Financial services | 2002 |
| Mikey Transport Ltd | Transport & logistics | 2026 |
| Milestone BDC Ltd | Construction | 2024 |
| Milford Research and Consultancy Limited | Professional & scientific | 2016 |
| Mill Farm (Harvington) Limited | Hospitality | 1953 |
| Mill Field Properties Limited | Real estate | 1953 |
| Millvale Building Services Limited | Construction | 2016 |
| Millwright House RTM Company Limited | Households | 2023 |
| Milus Minimarket Ltd | Wholesale & retail | 2021 |
| Milus Super Market Ltd | Wholesale & retail | 2026 |
| Milward Sales Consultants Limited | Administrative & support | 2010 |
| MIR ODO Trans Ltd | Transport & logistics | 2018 |
| MJ Catering Limited | Hospitality | 2017 |
| MJ Homes & Renovations Limited | Construction | 2024 |
| Mjeds Ltd | Construction | 2018 |
| MJH Clarke Holdings Limited | Financial services | 2024 |
| MJP Quality & Technical Services Ltd | Professional & scientific | 2024 |
| MJR Home Improvements Ltd | Construction | 2014 |
| MJW Plant Ltd | Agriculture & fishing | 2021 |
| MKP & H Limited | Construction | 2014 |
| MLS Top Limited | Professional & scientific | 2020 |
| MLW (Evesham) Limited | Real estate | 1976 |
| MM Services Ltd | Wholesale & retail | 2023 |
| MM8 Property Ltd | Real estate | 2019 |
| MME Quality Ltd | Professional & scientific | 2012 |
| MN8 Marketing Ltd | Professional & scientific | 2026 |
| Mobile Centre Limited | Wholesale & retail | 1996 |
| Mobilehut Evesham Ltd | Wholesale & retail | 2023 |
| Mobility Cabs Limited | Transport & logistics | 2011 |
| Moet Hennessy Louis Vuitton Ltd | Manufacturing | 2026 |
| Moluccan Limited | Information & communication | 2007 |
| Mondialsp Limited | Transport & logistics | 2023 |
| Monks Consultancy Limited | Health & social care | 2010 |
| Monsite Limited | Professional & scientific | 2017 |
| Monssi Limited | Information & communication | 2021 |
| Moongazing Hare Limited | Hospitality | 2006 |
| Moor View Construction Limited | Construction | 2014 |
| Morel Investments Ltd | Real estate | 2021 |
| Morgan Estates Management Ltd | Real estate | 2013 |
| Morris Advanced Composites Ltd | Manufacturing | 2025 |
| Morris Commercial Ltd | Manufacturing | 2015 |
| Mosaic Accounting Limited | Professional & scientific | 2012 |
| Moss Ventures Ltd | Real estate | 2015 |
| Motion&Moment Ltd | Professional & scientific | 2025 |
| Motorsportrecruitment Limited | Extraterritorial | 2008 |
| Motorvation (Evesham) Ltd | Wholesale & retail | 2014 |
| Mountain ASH Ecology Ltd | Professional & scientific | 2026 |
| Mowd Ltd | Wholesale & retail | 2023 |
| MR Autodoc Ltd | Wholesale & retail | 2026 |
| MRF Contractors Limited | Construction | 2014 |
| MRG Technology Ltd | Information & communication | 2025 |
| MRS Belle Haywood the Card Shop Ltd | Wholesale & retail | 2026 |
| MRS Maples Limited | Other services | 2012 |
| Murder 57 Bespoke Events Limited | Arts & recreation | 2025 |
| Murder 57 Ltd | Arts & recreation | 2016 |
| Muscat Construction Limited | Construction | 2025 |
| MVM Trans Group Ltd | Transport & logistics | 2023 |
| My Best Life Coaching Ltd | Professional & scientific | 2024 |
| My Dearest Mind Limited | Professional & scientific | 2024 |
| My Nest Group Limited | Real estate | 2025 |
| My Ride Taxi App Ltd | Other services | 2022 |
| Mylovecoons Ltd | Agriculture & fishing | 2026 |
| N & R Partnership Limited | Real estate | 2026 |