| Macdougall of Dunollie Preservation Trust | Arts & recreation | 1998 |
| Mackechnie Hotels (Oban) Limited | Hospitality | 1985 |
| Mackinnon Trustees Limited | Administrative & support | 1995 |
| Mackleeners Ltd | Other services | 2019 |
| Maclennan Distribution Ltd | Transport & logistics | 2010 |
| Maclennan Properties Limited | Administrative & support | 2024 |
| Macmillan Building Contractors Limited | Construction | 2023 |
| Macmillan Property Limited | Real estate | 2022 |
| Macpherson Hotels Ltd | Real estate | 2019 |
| Macqueen Bros Limited | Transport & logistics | 2007 |
| Macrae Marine Ltd | Professional & scientific | 2020 |
| Maelstrom Spirits Ltd | Manufacturing | 2024 |
| Maggie’S Cafe 58 Ltd | Hospitality | 2026 |
| Mainstay Scotland Limited | Manufacturing | 2019 |
| Marabeo Limited | Professional & scientific | 2025 |
| Marineconnex Limited | Administrative & support | 2025 |
| Marmaris Kebap House Ltd | Hospitality | 2023 |
| Martin Campbell Roofing Ltd | Construction | 2025 |
| Martin Marine Services Limited | Transport & logistics | 2019 |
| Matrix Computers (Oban) Ltd | Information & communication | 2016 |
| Matthew Tennant Ltd | Information & communication | 2012 |
| Maurice Lockhart Electrical Contractor Ltd | Construction | 2025 |
| Mccaig’S Dessert House Ltd | Hospitality | 2024 |
| Mccrae Marine Limited | Administrative & support | 2008 |
| Mcdougalls of Oban Limited | Wholesale & retail | 1972 |
| Mclaren Plant and Contracting Ltd | Construction | 2022 |
| Mcleod Television Limited | Other services | 2009 |
| MCM Developments (Oban) Ltd | Real estate | 2020 |
| Mcvicar Contractors Limited | Construction | 2018 |
| Mecfab Limited | Manufacturing | 2006 |
| Melfort Farms Limited | Agriculture & fishing | 1982 |
| Meltlicious Franchising Limited | Hospitality | 2024 |
| Meltlicious Limited | Hospitality | 2025 |
| Meroula Method Ltd | Arts & recreation | 2025 |
| MF Plumbing Services Ltd | Construction | 2021 |
| MGM Environmental Solutions Limited | Professional & scientific | 1992 |
| Mhorbricks & Co Limited | Real estate | 2025 |
| Michael Kennedy Joiner Limited | Construction | 2007 |
| MJ Property Scotland Ltd | Real estate | 2023 |
| MJK Decorators & Painters Limited | Construction | 2013 |
| Modern Lets Ltd | Real estate | 2023 |
| Molly (Oban) Ltd | Hospitality | 2021 |
| Monarch Highland Enterprises Limited | Hospitality | 2020 |
| Morvern Community Trading Company Ltd | Wholesale & retail | 2013 |
| Morvern Community Woodlands | Agriculture & fishing | 2004 |
| Morvolts Limited | Energy | 2019 |
| Mp&H Limited | Real estate | 2020 |
| MRR Property (Scotland) Limited | Real estate | 2003 |
| MSM PA34 Limited | Hospitality | 2022 |
| Muckairn Mussels Limited | Agriculture & fishing | 1993 |
| Muir BÀN Limited | Hospitality | 2019 |
| Mull Funeral Services Limited | Other services | 2017 |
| Mull Homes Limited | Extraterritorial | 2019 |
| Mull Joiners Limited | Construction | 2017 |
| Munro Builders Limited | Construction | 2022 |
| Munro Estates Ltd. | Professional & scientific | 1995 |
| Munro Property Partners Ltd | Real estate | 2024 |
| Munro's of Oban Limited | Wholesale & retail | 2004 |
| Murdoch Homes (Scotland) Ltd | Construction | 2023 |
| Murphy Properties Oban Ltd | Real estate | 2017 |
| Musselmen Limited | Hospitality | 2007 |
| Mycelium Analytics Ltd | Information & communication | 2024 |
| N D Macaskill & SON Limited | Transport & logistics | 2019 |
| N R Plant and Contracting Ltd | Construction | 2024 |
| N&C Milton Ltd | Agriculture & fishing | 2019 |
| Navra Scotland Ltd | Administrative & support | 2026 |
| Nc'Nean Distillery Limited | Manufacturing | 2013 |
| Neil Jordan Engineering Services Ltd | Professional & scientific | 2012 |
| Nevis Bank Hotel Limited | Hospitality | 2009 |
| Nevis Croft Limited | Hospitality | 2022 |
| Nevis Laundry Ltd. | Other services | 2019 |
| Newlights Store Limited | Wholesale & retail | 2023 |
| Newtec Heating Solutions Limited | Construction | 2025 |
| Nicholson Rope Access Ltd | Professional & scientific | 2024 |
| NMG Joinery Contractors Limited | Construction | 2023 |
| NO.17 the Promenade Limited | Hospitality | 2021 |
| NO.26 the Sea Limited | Hospitality | 2019 |
| Norfab Equipment Limited | Manufacturing | 2019 |
| North Argyll Eventide Home Association Ltd | Health & social care | 2015 |
| North Connel Hall Limited | Other services | 2016 |
| North Lorn LLP | | 2010 |
| North West Marine Limited | Construction | 2004 |
| Northern Trading (Inverness) Limited | Financial services | 2012 |
| Oban & Lorn Community Enterprise Limited | Arts & recreation | 1992 |
| Oban and District Access Panel | Health & social care | 2002 |
| Oban and District Development Trust Ltd | Health & social care | 2025 |
| Oban Bay Community Berthing Limited | Arts & recreation | 2010 |
| Oban Bay Lettings Ltd | Real estate | 2020 |
| Oban Brewery Limited | Manufacturing | 2020 |
| Oban CBT Clinic Ltd | Health & social care | 2019 |
| Oban Community Carers Ltd | Health & social care | 2017 |
| Oban Congregational Church | Other services | 2005 |
| Oban Cuisine Limited | Hospitality | 2025 |
| Oban Cycles Ltd | Wholesale & retail | 2015 |
| Oban Delight Limited | Hospitality | 2021 |
| Oban Dental Care Limited | Health & social care | 2021 |
| Oban Fish Company Ltd | Manufacturing | 2014 |
| Oban GIN and Spirit Company Limited | Manufacturing | 2023 |
| Oban GIN Ltd | Manufacturing | 2025 |
| Oban Holdings Limited | Professional & scientific | 2005 |