| M Morshor Ltd | Other services | 2016 |
| M Paisley Ltd | Other services | 2019 |
| M S Scot Foods Ltd | Wholesale & retail | 2025 |
| M Wood Ltd | Wholesale & retail | 2025 |
| M&A (Paisley) Limited | Wholesale & retail | 2026 |
| M&C Reilly Real Estate Limited | Real estate | 2026 |
| M&D Pubs Ltd | Hospitality | 2025 |
| M&M Meals Limited | Hospitality | 2019 |
| M-Verth Limited | Health & social care | 2018 |
| M.A.D Workers Ltd | Construction | 2024 |
| M.C. Catering (Ayrshire) Limited | Hospitality | 2021 |
| M.J. Harrison Supplies Limited | Construction | 2002 |
| M.P. Burke Transport (Holdings) Limited | Financial services | 2016 |
| M.P. Burke Transport Limited | Transport & logistics | 2009 |
| M2 Electrical and Data Services Ltd | Information & communication | 2015 |
| M4 Heating Systems Ltd | Construction | 2024 |
| M77 Property Ltd | Real estate | 2023 |
| Ma&T Limited | Water & waste | 2020 |
| Mabree Limited | Wholesale & retail | 2024 |
| MAC GDP Consultancy Ltd | Professional & scientific | 2025 |
| MAC Leisure Ltd | Administrative & support | 2016 |
| MAC Research and Consultancy Limited | Professional & scientific | 2025 |
| Macdonald & Cameron Holdings Ltd | Financial services | 2024 |
| Macdonald & Cameron Ltd | Professional & scientific | 2011 |
| Macdonald Estates Limited | Real estate | 2026 |
| Macdonalds Independent Financial Advisers Limited | Financial services | 2013 |
| Macfarlane Young Estate Agents Ltd | Real estate | 2024 |
| Macfarlane Young Lettings Ltd | Real estate | 2022 |
| Macfarlane Young Limited | Professional & scientific | 2007 |
| Macintosh Properties Ltd | Real estate | 2024 |
| Macintyre Properties Limited | Professional & scientific | 2004 |
| Mackay Heating (Scotland) Limited | Administrative & support | 2012 |
| Mackay Property Services Limited | Real estate | 2021 |
| Macleod Contractors Ltd | Construction | 2020 |
| Macmuguza Ltd | Transport & logistics | 2025 |
| Macnairs & Wilson Limited | Professional & scientific | 2014 |
| Macnaughton & Sons Limited | Real estate | 2019 |
| Macnicol Properties Ltd | Households | 2025 |
| Macom Technologies (UK) Limited | Extraterritorial | 1999 |
| Macrae & Rannoch Ltd | Administrative & support | 2016 |
| Macrae Joinery Limited | Manufacturing | 2013 |
| Macropaper Limited | Construction | 2008 |
| Macscot Limited | Education | 2011 |
| Madden Landscapes (Scotland) Limited | Administrative & support | 2019 |
| Made by Andy Tomlinson Ltd | Professional & scientific | 2023 |
| Made in Europe Paisley Ltd | Wholesale & retail | 2025 |
| Made in Paisley Limited | Arts & recreation | 2025 |
| Made in Ukraine Limited | Other services | 2023 |
| Madester Property Ltd | Real estate | 2023 |
| Madey Ventures Ltd | Administrative & support | 2025 |
| Madigan Holdings Limited | Construction | 1962 |
| Madina Enterprises Ltd | Wholesale & retail | 2025 |
| Madley Social Limited | Hospitality | 2023 |
| Maga Invest Limited | Financial services | 2021 |
| Magik Records Limited | Arts & recreation | 2024 |
| Magootech Ltd | Construction | 2023 |
| Mahan One Ltd | Hospitality | 2026 |
| Maintenance& Ltd | Professional & scientific | 2016 |
| Mair Finance Limited | Financial services | 2018 |
| Mair Healthy Ltd | Wholesale & retail | 2021 |
| Maira Ahmad Limited | Health & social care | 2025 |
| Maju Ltd | Real estate | 2025 |
| MAK (Neilston Road) Ltd | Wholesale & retail | 2011 |
| MAK Electrical Services (Glasgow) Limited | Construction | 2018 |
| Makiato Land Ltd | Real estate | 2025 |
| Making Memories Childcare Ltd | Education | 2021 |
| Makisa Services Ltd | Administrative & support | 2026 |
| Malcolm Properties (Holdings) Limited | Administrative & support | 2005 |
| Malcolm Whitecross Limited | Construction | 2008 |
| Malik General Store Limited | Wholesale & retail | 2015 |
| Manana Music Management Ltd | Information & communication | 2018 |
| Mancave Greentech Solutions Ltd | Construction | 2025 |
| Mandapanda Deliveries Ltd | Transport & logistics | 2025 |
| Manderson Properties Ltd | Real estate | 2026 |
| Mangan Structural Services Ltd | Professional & scientific | 2011 |
| Manis News Ltd | Wholesale & retail | 2012 |
| Mansionhouse Projects Limited | Information & communication | 2004 |
| Manu Transport Ltd | Transport & logistics | 2018 |
| Marble Support Services Ltd | Extraterritorial | 2025 |
| Marenna Marketing Limited | Wholesale & retail | 2023 |
| Marenna Group Limited | Financial services | 2025 |
| Marenna Investments Limited | Financial services | 2022 |
| Marie AJ Care Ltd | Health & social care | 2016 |
| Marius Highway Ltd | Construction | 2018 |
| Mark D Gray Limited | Manufacturing | 2003 |
| Mark Dinardo Construction Limited | Construction | 1988 |
| Mark Dinardo Developments Limited | Construction | 1988 |
| Market Clear Limited | Professional & scientific | 2024 |
| Market Research North East Ltd | | 1991 |
| Marola Restaurants Ltd | Hospitality | 2017 |
| Marr Aesthetics Ltd | Other services | 2020 |
| Marr Associates Ltd | Other services | 2018 |
| Marsal Accountants Ltd | Professional & scientific | 2025 |
| Marshall Douglas Ltd. | Administrative & support | 2010 |
| Martin Byrne Plastering Ltd | Construction | 2018 |
| Martin Electrical Ltd | Construction | 2025 |
| Martin Mitchell Limited | Administrative & support | 1996 |
| Marvelous Car Wash Ltd | Administrative & support | 2025 |
| Marvig Boatyard Limited | Manufacturing | 2015 |
| MAS Telecom Services Limited | Information & communication | 2024 |