| M&M Prestige Group Ltd | Administrative & support | 2026 |
| M.G Auto Motorsport Ltd | Wholesale & retail | 2011 |
| Maat Cars Limited | Wholesale & retail | 2025 |
| Machall Investments Limited | Wholesale & retail | 1992 |
| Machine Building Group Limited | Financial services | 2023 |
| MAD Construction Solutions Limited | Construction | 2025 |
| MAD Fleet Services Limited | Wholesale & retail | 2025 |
| MAD Payroll (UK) Limited | Professional & scientific | 2025 |
| MAD Payroll Solutions Limited | Professional & scientific | 2024 |
| MAD Rental Solutions Limited | Administrative & support | 2024 |
| Made to Measure Blinds (Derby) Ltd | Construction | 2026 |
| Made With Art Customs Ltd | Arts & recreation | 2025 |
| Magnus Plumbing and Heating Limited | Construction | 2020 |
| Magpie Labels Ltd | Wholesale & retail | 2006 |
| Mah&Wic Limited | Real estate | 2018 |
| Malcolm Jordan Limited | Agriculture & fishing | 2009 |
| Manders Garage (Ripley) Limited | Wholesale & retail | 1996 |
| Manders Holdings Ltd | Financial services | 2024 |
| Manthorpe Engineering Limited | Manufacturing | 1984 |
| Manthorpe Holdings Limited | Professional & scientific | 2018 |
| Manthorpe Limited | Professional & scientific | 1987 |
| Manthorpe Stainless Steel Fabrications Limited | Manufacturing | 2014 |
| Manvers Building Contractors Ltd | Construction | 2020 |
| Marathon Threads (Nottingham) Ltd | Wholesale & retail | 2006 |
| Marehay Garage Services Limited | Wholesale & retail | 2016 |
| Marehay Hall Farm Ltd | Hospitality | 2024 |
| MAT Investments Limited | Real estate | 1989 |
| Matt and Matt Limited | Hospitality | 2003 |
| Matthew Thomas Getaways Limited | Households | 2025 |
| Matthew Thomas Residential Limited | Real estate | 2017 |
| Maya Derby Ltd | Other services | 2023 |
| Mayafab United Kingdom Ltd | Manufacturing | 2025 |
| Mayfair Hair Ltd | Other services | 2023 |
| MB Landscaping & Paving Ltd | Construction | 2019 |
| MCC Trading Limited | Wholesale & retail | 2014 |
| MDL Training Solutions Limited | Administrative & support | 2026 |
| Meat Inn Holdings Limited | Real estate | 1994 |
| Mebe Property Company Ltd | Construction | 2025 |
| Mei.Stu Ltd | Other services | 2026 |
| Melisa Pizza Ltd | Hospitality | 2025 |
| Method Home Solutions Limited | Real estate | 2017 |
| MG Farming LLP | | 2020 |
| MHN & UZ Ltd | Hospitality | 2026 |
| Miava Production Ltd | Information & communication | 2024 |
| MIC Installations (Nottingham) Limited | Real estate | 1966 |
| Michelmersh Trustees Limited | Professional & scientific | 2019 |
| Midas Property Assets Ltd | Real estate | 2022 |
| Midland Railway Trust Limited | Arts & recreation | 1973 |
| Midland Technologies Limited | Wholesale & retail | 2025 |
| Mihalitrans Limited | Transport & logistics | 2016 |
| Millington Green Limited | Real estate | 2023 |
| Minibossbeautyacademy Ltd | Education | 2025 |
| Minotaur (Norfolk) Limited | Mining & quarrying | 2013 |
| Mirabel Home Furnishings Limited Limited | Manufacturing | 2016 |
| Mirabel Limited | Wholesale & retail | 2016 |
| Miran Masal Ltd | Hospitality | 2026 |
| Misel Limited | Hospitality | 2024 |
| Miserotti Ltd | Wholesale & retail | 2023 |
| MJ Barber Studio Ltd | Other services | 2025 |
| MM Maxi Ltd | Manufacturing | 2023 |
| MM Premium Ltd | Manufacturing | 2023 |
| Modie Properties Ltd | Real estate | 2026 |
| Monmos Ripley Limited | Hospitality | 2022 |
| Morpheus Care Ltd | Health & social care | 2021 |
| Morvern Group Limited | Manufacturing | 2018 |
| Motion Music Events Limited | Arts & recreation | 2024 |
| Motostop Limited | Wholesale & retail | 2011 |
| Mountain Vision Investments Ltd | Real estate | 2025 |
| Mpower Solutions Ltd | Construction | 2024 |
| MR & MRS Gaba Ltd | Wholesale & retail | 2025 |
| MR T'S Ripley Ltd | Hospitality | 2025 |
| Mrtt Holdings Limited | Financial services | 2025 |
| Multiconnect Limited | Construction | 2025 |
| Multitrades (Midlands) Ltd | Construction | 2023 |
| Murphy Brook Properties Limited | Real estate | 2020 |
| Mxfactoryparts Ltd | Wholesale & retail | 2019 |
| My Education Exchange Limited | Education | 2022 |
| N & K Martin Ltd | Hospitality | 2018 |
| N C Interpreting Ltd | Professional & scientific | 2022 |
| N D Interior Design Ltd | Professional & scientific | 2018 |
| N.B.E. Fire Prevention Limited | Administrative & support | 2008 |
| N9 Builders Ltd | Construction | 2026 |
| Nags Head (Ripley) Ltd | Hospitality | 2022 |
| Neal Gupta Consulting Ltd | Extraterritorial | 2022 |
| NEC Consulting Limited | Professional & scientific | 2018 |
| NEC UK Construction Ltd | Manufacturing | 2020 |
| Neil Palmer Properties Limited | Real estate | 2008 |
| Never Forever Limited | Other services | 2017 |
| Next Generation Home Improvements Limited | Construction | 2010 |
| Next Generation Property Investments Limited | Real estate | 2006 |
| Next Generation Resin Drives Limited | Administrative & support | 2004 |
| Nexus Connective Ltd | Information & communication | 2025 |
| Nick Smith Dental Ltd | Health & social care | 2022 |
| Nightingale Logistic Ltd | Transport & logistics | 2025 |
| Nightingale Recordings Limited | Information & communication | 2008 |
| NM Fencing Contractors Limited | Construction | 2024 |
| NODE56 Limited | Health & social care | 2011 |
| Nomad Podcast Limited | Information & communication | 2022 |
| North Derbyshire Foot Clinic Ltd | Health & social care | 2013 |
| North Peak Construction Limited | Construction | 2003 |