| Marchmont Café Ltd | Hospitality | 2024 |
| Marchmont Homes Limited | Professional & scientific | 2007 |
| Marcin Courier Ltd | Transport & logistics | 2022 |
| Margaret Scott Couriers Ltd | Transport & logistics | 2023 |
| Mariana Marasoiu Consultancy Ltd | Information & communication | 2025 |
| Marine & Technical Services (Highland) Limited | Other services | 2007 |
| Marine Blaw Trade LP | | 2016 |
| Marine Projects Ltd | Manufacturing | 2008 |
| Mariners Catering Ltd | Hospitality | 2025 |
| Marion Ventures LP | | 2016 |
| Mark Barclay Carpentry & Joinery Ltd | Construction | 2026 |
| Mark Copper Roofing Ltd | Construction | 2016 |
| Mark Henderson (Joiners) Ltd. | Construction | 2005 |
| Mark Macdonald Ltd | Construction | 2024 |
| Mark Maclean Limited | Administrative & support | 2008 |
| Marmorino Highlands Limited | Manufacturing | 2023 |
| Martin Sanderson Joinery Limited | Construction | 2011 |
| Martinet Properties Ltd | Hospitality | 2024 |
| Martins Autos Ltd | Wholesale & retail | 2020 |
| Maruthi Foods Ltd | Hospitality | 2024 |
| Marvellous Property Solutions Ltd | Real estate | 2025 |
| Marwell Ltd | Financial services | 2024 |
| Marwick Consulting Ltd | Professional & scientific | 2024 |
| Maryburgh Amenities Company Limited | Administrative & support | 2013 |
| Marysia&Marysia Limited | Wholesale & retail | 2021 |
| Mason Practice Ltd | Information & communication | 2026 |
| Masonic Properties (Inverness) Limited | Other services | 1964 |
| Master Tailors (Dingwall) Limited | Manufacturing | 2015 |
| Matheson Builders Limited | Construction | 2005 |
| Matheson Services Ltd | Professional & scientific | 2021 |
| Mathiesons’ Care and Well Being Limited | Health & social care | 2023 |
| Matt Leisure Ltd | Hospitality | 2024 |
| Mauranne Properties Limited | Real estate | 2011 |
| MAX Maxwell Ltd | Professional & scientific | 2015 |
| Maxima Trade L.P. | | 2013 |
| Maximo Trade L.P. | | 2014 |
| MAXS2 Ltd | Hospitality | 2025 |
| Maxtas Ltd | Manufacturing | 2026 |
| Maxwell & Company Architects and Designers Limited | Professional & scientific | 1992 |
| Maxwide Corporation L.P. | | 2013 |
| Mayak Displays LP | | 2018 |
| MB Safety Instrumented Specialist Ltd | Energy | 2023 |
| MBM Shelfco (8) Limited | Professional & scientific | 2005 |
| MC Builders (Highland) Ltd. | Construction | 1997 |
| MC Formwork Ltd. | Construction | 2007 |
| Mcbain's Catering Ltd | Hospitality | 2014 |
| Mcbains Properties Ltd | Extraterritorial | 2026 |
| Mccarthy Chauffeur Services Ltd | Transport & logistics | 2024 |
| Mccue & Murray Investments Limited | Real estate | 2023 |
| Mcdc Property Ltd | Real estate | 2025 |
| Mcedge Ltd | Administrative & support | 2021 |
| Mcewan Hogg Sheriff Officers LLP | | 2026 |
| Mcewan of Inverness Limited | Other services | 2014 |
| Mcgillivray Wilson Ltd | Arts & recreation | 2025 |
| Mcglade Forestry Limited | Administrative & support | 2010 |
| Mcgregor & Co Ltd | Professional & scientific | 2023 |
| Mcgregor Construction (Highlands) Limited | Construction | 1977 |
| Mcinnes Group Limited | Construction | 2012 |
| Mcinnes Holdings Limited | Professional & scientific | 2016 |
| Mcivor Access & Maintenance Ltd | Mining & quarrying | 2022 |
| Mckenzie Craiglands Ltd. | Agriculture & fishing | 2011 |
| Mclaren Tractors Limited | Wholesale & retail | 2003 |
| Mclennan Partners Limited | Real estate | 2017 |
| Mcleod Catering Services Limited | Hospitality | 2012 |
| Mcleods Inverness Limited | Hospitality | 2022 |
| MCM Investment House LLP | | 2002 |
| MCM Support Ltd | Administrative & support | 2025 |
| Mcmillan Group Ltd | Hospitality | 2024 |
| Mcmillan Leisure Limited | Hospitality | 2004 |
| Mcmonagle Masonry Ltd | Construction | 2024 |
| Mcplan Signature Planning Consultancy Limited | Professional & scientific | 2025 |
| Mcvls Ltd | Real estate | 2022 |
| MDE Lettings Limited | Real estate | 2024 |
| Meadows Cleish LLP | | 2019 |
| Meal Agro LP | | 2015 |
| Meallmore (Development Properties) Limited | Construction | 2007 |
| Meallmore Limited | Health & social care | 1986 |
| Meallmore Services Limited | Health & social care | 2019 |
| Mearns Care Limited | Health & social care | 2014 |
| Media Pro Scotland Ltd | Construction | 2013 |
| Medical Management (Highland) Limited | Health & social care | 1996 |
| Mega Resources L.P. | | 2014 |
| Mego Exports L.P. | | 2014 |
| Meikle Phoineas Farm Partnership | | 1987 |
| Melliot Development LP | | 2017 |
| Meltor Solution LP | | 2016 |
| Menopause Health Highland LLP | | 2022 |
| Mercer Style LP | | 2016 |
| Merctrading LP | | 2016 |
| Mercury Alliance L.P. | | 2014 |
| Mercury Cleaning Ltd. | Administrative & support | 2012 |
| Mercury Holiday Homes Ltd | Administrative & support | 2024 |
| Meridian L.P. | | 2014 |
| Meridian Management L.P. | | 2015 |
| Meridian Trade L.P. | | 2014 |
| Meridium Capital L.P. | | 2014 |
| Merkinch Partnership Ltd | Information & communication | 2011 |
| Messieurs Clunas and Stott | | 1999 |
| Meta Consulting Engineers Limited | Professional & scientific | 2016 |
| Metagama Productions Limited | Information & communication | 1999 |