| Masawalam Ltd | Professional & scientific | 2025 |
| Massage & Glow (Scotland) Ltd | Other services | 2018 |
| Master Chef 1 Ltd | Hospitality | 2025 |
| Master Chef Paisley Ltd | Hospitality | 2026 |
| Mathers Telecommunications Limited | Information & communication | 2022 |
| Mathison, Palmer & Company Limited | Manufacturing | 1920 |
| Matrix Property Investments (Scotland) Limited | Real estate | 2022 |
| Mattress Uplift Services Limited | Water & waste | 2025 |
| Matts Consultancy Limited | Wholesale & retail | 2019 |
| Maude Engineering Services Limited | Construction | 2003 |
| Maulside Limited | Real estate | 2017 |
| Maureen Rutherford Limited | Health & social care | 2011 |
| Maxalf Ltd | Hospitality | 2026 |
| Maximum Fire & Security Ltd | Administrative & support | 2023 |
| Maximus Ventures Ltd | Wholesale & retail | 2025 |
| Maxsafe Solutions Ltd | Professional & scientific | 2011 |
| Mayfield Garage (Scotland) Ltd. | Administrative & support | 2010 |
| Mazomba Equity Holdings Ltd | Real estate | 2023 |
| Mazomba Property Group Ltd | Real estate | 2023 |
| MB 74 Consultancy Limited | Administrative & support | 2017 |
| MB Construction & Maintenance Ltd | Construction | 2023 |
| MBI Tasnim Ltd | Households | 2024 |
| MBT Property Limited | Real estate | 2019 |
| MBW Dust Pollution Engineers Ltd | Professional & scientific | 2011 |
| MC (Scotland) Enterprise Limited | Wholesale & retail | 2017 |
| Mcallister Forestry & Construction Ltd | Construction | 2026 |
| Mcarthur Allan Consulting Ltd | Administrative & support | 2017 |
| Mcarthur Allan Holdings Limited | Financial services | 2025 |
| MCC Hire (UK) Ltd | Administrative & support | 2024 |
| MCC Movement (Scotland) Ltd | Transport & logistics | 2024 |
| Mccabe Industrial Services Ltd | Professional & scientific | 2026 |
| Mccafferty Consultancy Limited | Construction | 2010 |
| Mccaig Tavern Limited | Hospitality | 2012 |
| Mccamley & Laurie Property Ltd | Real estate | 2024 |
| Mccartney Business Solutions Limited | Professional & scientific | 2020 |
| Mcclure Projects Ltd | Real estate | 2026 |
| Mccoll Transport Limited | Transport & logistics | 2016 |
| Mccreath Consultancy Ltd | Financial services | 2026 |
| Mcdonald 1 Ltd | Information & communication | 2025 |
| Mcfarlane Trust Ltd. | Health & social care | 1989 |
| MCG Brothers Property Holdings Limited | Hospitality | 2016 |
| Mcgeehan & Co Ltd | Professional & scientific | 2009 |
| Mcgregor Animal Chiropractic Limited | Other services | 2025 |
| Mcgregor Plumbing and Heating Limited | Construction | 2020 |
| Mcguire Power Solutions Ltd | Construction | 2025 |
| Mcilvaney Property Ltd | Real estate | 2024 |
| Mckay & Moffat Property Ltd | Real estate | 2020 |
| Mckeating Estates Ltd | Real estate | 2016 |
| Mckellar Accountancy Ltd | Professional & scientific | 2017 |
| Mckellar Property Investments Ltd | Real estate | 2022 |
| Mckellar Property Solutions Ltd | Real estate | 2023 |
| Mckelvie Events Ltd | Hospitality | 2023 |
| Mckenzie Glen Ltd | Other services | 2018 |
| Mckeown Electrical Limited | Energy | 2006 |
| Mckim Cleaning Services Ltd | Administrative & support | 2015 |
| Mckim Properties Ltd | Real estate | 2024 |
| Mclaren and Co Group Ltd | Construction | 2020 |
| Mclaren Glasgow Limited | Households | 2019 |
| Mclaren Ross Limited | Professional & scientific | 2018 |
| Mclauchlan Jewellers Limited | Wholesale & retail | 2008 |
| Mcld Build Ltd | Construction | 2026 |
| Mclean Construction Consultancy Ltd | Professional & scientific | 2022 |
| Mcluckie Engineering (LEV) Ltd | Energy | 2012 |
| MCM F.R.C Limited | Construction | 2025 |
| MCM Formwork Services Limited | Construction | 2008 |
| Mcmanus Mechanic Ltd | Professional & scientific | 2025 |
| Mcmetals Recycling Ltd | Water & waste | 2023 |
| Mcnaught 1888 Ltd | Manufacturing | 2022 |
| Mcneeandmcdougall Ltd | Wholesale & retail | 2025 |
| MCR Plumbing and Heating (Scotland) Ltd | Construction | 2024 |
| MCS Safety Systems Limited | Construction | 2009 |
| Mcscraggle Ltd | Manufacturing | 2024 |
| Mcsorley Electrical Services Limited | Construction | 2020 |
| MD Plumbing & Heating Services (Scotland) Ltd | Construction | 2023 |
| Meams Limited | Health & social care | 2020 |
| Mearns After School Care Service Limited | Health & social care | 1995 |
| Meat at Your Place Limited | Hospitality | 2016 |
| Mecafit Ltd | Manufacturing | 2024 |
| Media Monty Limited | Information & communication | 2015 |
| Medsure Staffing Ltd | Administrative & support | 2025 |
| Mega Auto Repair Ltd | Wholesale & retail | 2024 |
| Megan Reid Hair Design Ltd | Other services | 2021 |
| Megzon Engineering Ltd | Professional & scientific | 2024 |
| Mehar Brothers Furniture Ltd | Wholesale & retail | 2023 |
| Mellonwhite Consulting Ltd | Professional & scientific | 2020 |
| Melnewsagent Ltd | Wholesale & retail | 2019 |
| Melrose Wemyss Associates Limited | Financial services | 2018 |
| Memorisation Ltd | Wholesale & retail | 2022 |
| Mercury Energy Solutions Ltd | Other services | 2011 |
| Merit Enterprises Ltd | Real estate | 2017 |
| Merj Transport Limited | Transport & logistics | 2019 |
| Merlin Mobiles Ltd. | Information & communication | 2006 |
| Merlin Mossland Holdings Limited | Other services | 2017 |
| Mersion Ltd | Extraterritorial | 2009 |
| Metal Circus Limited | Information & communication | 2014 |
| Metalworx Body Piercing Limited | Wholesale & retail | 2019 |
| Metasat UK Ltd | Energy | 2020 |
| Metisgroup.Co.Uk | | 1999 |
| Metrashev Property Maintenance & Renovations Ltd | Construction | 2014 |
| Mezo Express Ltd | Wholesale & retail | 2026 |