| Millet Properties Limited | Administrative & support | 2011 |
| Mina Patel Ltd | Health & social care | 2013 |
| Mind Kind Limited | Health & social care | 2016 |
| Mini MOO Ltd | Manufacturing | 2025 |
| Mirkar Transport Ltd | Transport & logistics | 2022 |
| MJP Groundworks Ltd | Construction | 2021 |
| MK Exmoor Ltd | Wholesale & retail | 2025 |
| MK General Construction Works Ltd | Construction | 2023 |
| MKL Kozub Consulting Limited | Construction | 2015 |
| Mlrh Family Limited | Financial services | 2025 |
| MNS Carpentry & General Building Ltd | Manufacturing | 2025 |
| Mobicode Ltd | Information & communication | 2011 |
| Modulor Limited | Real estate | 2019 |
| Moggie Properties Ltd | Real estate | 2022 |
| Monahan-Waters Group Ltd | Financial services | 2024 |
| Monstervdub Limited | Wholesale & retail | 2017 |
| Monument Plant Limited | Construction | 2014 |
| Moon Self Storage Limited | Other services | 2020 |
| Moor Rooms Limited | Hospitality | 2021 |
| Moore Agronomy Limited | Agriculture & fishing | 2011 |
| Moorhayes Community Association | Arts & recreation | 2011 |
| Moorhayes Country House Limited | Hospitality | 2014 |
| Moorhayes Park Management Company (NO.2) Limited | Households | 2005 |
| Moorhayes Park Management Company (NO5) Limited | Real estate | 2007 |
| Moorhayes Park Management Company (Number One) Limited | Real estate | 2003 |
| Morrells Mews Management Ltd | Households | 2023 |
| Morrish Engineering Limited | Manufacturing | 1985 |
| Movespace Residents Management Limited | Households | 1988 |
| Mpli Ltd | Hospitality | 2003 |
| MPM Wholesale Supplies Limited | Wholesale & retail | 2010 |
| MRS Gills Bakery Ltd | Manufacturing | 2025 |
| Msteele Engineering Ltd | Construction | 2021 |
| MTB OST Ltd | Administrative & support | 2012 |
| MTC Technology Limited | Information & communication | 2025 |
| Muckineer-Hoist Ltd | Manufacturing | 2019 |
| Multi Glazing Systems Limited | Wholesale & retail | 1991 |
| Murex Babbington Limited | Energy | 2013 |
| Murex Bake Limited | Energy | 2013 |
| Murex Developments Limited | Energy | 2018 |
| Murex Energy Limited | Energy | 2010 |
| Murex Energy Solar Limited | Energy | 2014 |
| Murex Energy Wind Limited | Energy | 2013 |
| Murex Fursdon Limited | Energy | 2013 |
| Murex Martin Solar Ltd | Energy | 2014 |
| Murex Power B Limited | Energy | 2014 |
| Murex Power Ltd | Energy | 2014 |
| Murex Wilton Limited | Energy | 2013 |
| Muxworthy LLP | | 2011 |
| Muxworthy Lymington LLP | | 2011 |
| MV BIO Services Ltd | Wholesale & retail | 2012 |
| MWS Property Ltd | Real estate | 2020 |
| MWS Property Management Ltd | Wholesale & retail | 2022 |
| Mxresults Limited | Arts & recreation | 2025 |
| My Elite Wardrobe Limited | Wholesale & retail | 2024 |
| My Own FD Ltd | Manufacturing | 2010 |
| My Slide Limited | Manufacturing | 2024 |
| Myles Clough Management Services Limited | Professional & scientific | 2022 |
| N & C Polytunnel Installers Limited | Construction | 2012 |
| Nanny Bears Childcare Ltd | Education | 2018 |
| Nanny Bears Children's Community CIC | Health & social care | 2023 |
| Nanny Bears Ltd | Education | 2022 |
| Napoli Tiverton Ltd | Hospitality | 2023 |
| Narratives of Hope C.I.C. | Information & communication | 2024 |
| Natural Looks Trading Limited | Manufacturing | 2000 |
| NDP Electrical Ltd | Construction | 2022 |
| Nell-Nichols Limited | Professional & scientific | 2019 |
| Neon Bridge Consulting Limited | Other services | 2018 |
| New Good World Chinese Restaurant Limited | Hospitality | 2017 |
| New Homestead Property (Investment) Company Limited | Real estate | 2021 |
| New Jubilee Company Devon Limited | Professional & scientific | 2018 |
| New Life Horse Care Sanctuary | Education | 2014 |
| New Oak (Dartmoor Stud) Limited | Agriculture & fishing | 2009 |
| Next Steps Training CIC | Construction | 2022 |
| Nextgenlabsuk Ltd | Professional & scientific | 2025 |
| NGP Tiverton Limited | Hospitality | 2021 |
| NH Nails Ltd | Other services | 2025 |
| Niaski Limited | Professional & scientific | 2019 |
| Nicholas Pearson Partnership LLP | | 2011 |
| Nick Helsing Ltd | Administrative & support | 2007 |
| Nickel Avenue Limited | Arts & recreation | 1994 |
| Nicky Brimmer Ltd | Professional & scientific | 2018 |
| Nomansland Biogas Limited | Energy | 2013 |
| Nomansland Festivals CIC | Arts & recreation | 2024 |
| Nomansland Retail Ltd | Hospitality | 2025 |
| Nomansland Ventures Ltd | Real estate | 2025 |
| North Devon Tyres Ltd. | Wholesale & retail | 2002 |
| North Star Timber Frames Limited | Manufacturing | 2016 |
| Northern Town Limited | Information & communication | 2012 |
| Northfield Foundry Limited | Manufacturing | 1990 |
| Number 33 Bakery Ltd | Wholesale & retail | 2025 |
| Number 33 Limited | Real estate | 2008 |
| Numerical Optics Ltd | Professional & scientific | 2012 |
| Nutrient Credits Limited | Water & waste | 2023 |
| Nyne Apps Ltd | Professional & scientific | 2024 |
| O'Brien Solutions Ltd | Households | 2025 |
| Oakbank Property Services Limited | Real estate | 2004 |
| Oakbeam Property Developments Limited | Construction | 2024 |
| Oakford Trout | Agriculture & fishing | 1984 |
| Oakwood Specialist Colleges Limited | Education | 1998 |
| Oast Engineering Examinations Limited | Professional & scientific | 2002 |