| Metajoin Limited | Information & communication | 2025 |
| Metal Business LP | | 2016 |
| Metal Coralino Trade Ltd | Professional & scientific | 2018 |
| Metal International Business LP | | 2016 |
| Metal World LP | | 2016 |
| Metalane Sales LP | | 2015 |
| Metalforum L.P. | | 2012 |
| Metalissima LP | | 2016 |
| Metalitaly International Consortium | | 1994 |
| Metaltrade Projects L.P. | | 2016 |
| Metaplas Limited | Manufacturing | 1996 |
| Metard LP | | 2012 |
| Metastrength Holdings Limited | Extraterritorial | 2013 |
| Metatech Limited | Information & communication | 2002 |
| Metco Partnership | | 2009 |
| Metcoal Resources LP | | 2016 |
| Meteorbridge Ltd | Wholesale & retail | 2026 |
| Metertech Ltd | Manufacturing | 2020 |
| Metex Traders Ltd | Other services | 2021 |
| Methanogon Ltd | Professional & scientific | 2026 |
| Methley Estates (Holdings) Limited | Agriculture & fishing | 1973 |
| Method Consult LP | | 2013 |
| Method Studio Ltd | Manufacturing | 2012 |
| Metigter Sales LP | | 2015 |
| Metis Studio Ltd | Professional & scientific | 2019 |
| Metrica Tech LP | | 2003 |
| Metricon Group LP | | 2017 |
| Metro Auto Centre Ltd | Manufacturing | 2016 |
| Metro Food Services Ltd | Hospitality | 2022 |
| Metro Management Solutions Limited | Administrative & support | 2014 |
| Metro Restaurants (Edinburgh) Limited | Hospitality | 2000 |
| Metro Solutions&Management LP | | 2019 |
| Metrogate Realty Limited | Real estate | 2025 |
| Metrogrow Limited | Construction | 2001 |
| Metrotek Ltd | Professional & scientific | 2022 |
| Mets Properties LP | | 2017 |
| Mettex LP | | 2012 |
| Meucci Ltd | Hospitality | 2015 |
| Meuhfahsih Limited | Real estate | 2025 |
| Meva Star SLP | | 2007 |
| Mevans Property Ltd | Real estate | 2022 |
| Meveden Technologies Ltd | Information & communication | 2024 |
| Mexas Algonce Limited | Hospitality | 2024 |
| Mexbury LP | | 2013 |
| Mexica Holdings Ltd | Financial services | 2026 |
| Mexican Investment LP | | 2003 |
| Mexico Impex LP | | 2014 |
| Mexpol Ltd | Hospitality | 2025 |
| MEY Energy Storage Holdings Limited | Administrative & support | 2023 |
| MEY Energy Storage Limited | Administrative & support | 2023 |
| Meygen Holdings Limited | Financial services | 2014 |
| Meygen PLC | Administrative & support | 2008 |
| Meygrid Limited | Administrative & support | 2023 |
| Mezan Services Ltd | Transport & logistics | 2020 |
| Mezcal Edinburgh Ltd | Hospitality | 2018 |
| Mezo Beauty Ltd | Other services | 2021 |
| Mezoim Investments | Administrative & support | 2026 |
| Mezzanine Management Fund IV Founder Partner SLP | | 2007 |
| Mezzar LP | | 2014 |
| Mezze District Ltd | Hospitality | 2026 |
| MF Coffee Shop Limited | Hospitality | 2023 |
| MF Industries L.P. | | 2013 |
| MF Park Ltd | Professional & scientific | 2023 |
| MF Travel Limited | Administrative & support | 2014 |
| Mfcore Ltd | Information & communication | 2026 |
| MFE Ltd | Professional & scientific | 2025 |
| Mffc Limited | Health & social care | 2023 |
| MFG Forecourt Ltd | Wholesale & retail | 2023 |
| MFH Service Quality Management Limited | Construction | 2013 |
| MFJ Property Ltd | Real estate | 2022 |
| MFM Edinburgh (Mountain of Fire and Miracle Edinburgh) | Other services | 2017 |
| Mfmac Secretaries Limited | Professional & scientific | 2004 |
| MFR Rare Books Limited | Wholesale & retail | 2024 |
| MFS Food Ltd | Wholesale & retail | 2024 |
| MFT Scotland Ltd | Households | 2026 |
| MFZ Farms Ltd | Agriculture & fishing | 2025 |
| MG Edinburgh Luxury Stays Ltd | Hospitality | 2025 |
| MG PAY Ltd | Other services | 2019 |
| MGAVIN89 Limited | Professional & scientific | 2023 |
| MGB Biopharma Limited | Professional & scientific | 2009 |
| MGB HV Services Limited | Professional & scientific | 2013 |
| MGC Electrical (Scotland) Limited | Construction | 2019 |
| MGL Fleet Services Ltd | Wholesale & retail | 2025 |
| MGR Highland LP | | 2025 |
| MGR Industrial Services Limited | Construction | 2011 |
| MGR Sales L.P. | | 2011 |
| MGR Scotland Ltd | Real estate | 2025 |
| Mgrh Admin Ltd | Financial services | 2025 |
| MGS Group LP | | 2016 |
| MGS Video Ltd | Information & communication | 2025 |
| MGT Foods UK Limited | Hospitality | 2022 |
| MGT Service (Scotland) Ltd | Professional & scientific | 2026 |
| MGV Consultancy Ltd | Professional & scientific | 2026 |
| MGX Trade L.P. | | 2014 |
| MH & Co Properties Ltd | Real estate | 2026 |
| MH Autos (Edinburgh) Ltd | Wholesale & retail | 2013 |
| MH Executive Limited | Transport & logistics | 2009 |
| MH Insure Ltd | Hospitality | 2026 |
| MH Investment Management Ltd | Extraterritorial | 2012 |
| MH Pension Trustees Limited | Administrative & support | 2024 |