| MCS Subsea Solutions Limited | Mining & quarrying | 2018 |
| Mcsolrac Consulting Ltd | Information & communication | 2025 |
| MCT NDT Scotland Limited | Professional & scientific | 2017 |
| MD Amplitude Ltd | Construction | 2014 |
| MD Directors Limited | Professional & scientific | 1987 |
| MD House Builders Ltd | Construction | 2026 |
| MD Media Management Ltd | Professional & scientific | 2025 |
| MD Secretaries Limited | Professional & scientific | 1987 |
| Mdan Services Ltd | Manufacturing | 2018 |
| MDC Inspection Ltd | Professional & scientific | 2025 |
| Mddr Parsa Bazyari Ltd | Health & social care | 2024 |
| Mddr Pouya Darbandiazar Ltd | Health & social care | 2024 |
| MDE Group UK Ltd | Professional & scientific | 2026 |
| MDL Enterprise Limited | Professional & scientific | 2023 |
| MDR Energy Consulting Limited | Professional & scientific | 2025 |
| MDS Oilfield Consultancy Limited | Mining & quarrying | 2017 |
| MDT Holdings (Aberdeen) Limited | Administrative & support | 2010 |
| Mdts Holdings Limited | Financial services | 2024 |
| MDY Aberdeen Limited | Professional & scientific | 2016 |
| ME Offshore Epci Management Services Ltd | Professional & scientific | 2026 |
| Mead Medical Holdings Limited | Administrative & support | 2004 |
| Mead Medical Services Limited | Health & social care | 1987 |
| Meadaple Energy Ltd | Energy | 2015 |
| Meadowlets Ltd | Real estate | 2022 |
| Meadowpark Bofa Limited | Hospitality | 2024 |
| Meadows Joinery Limited | Construction | 2024 |
| Meal Prep Shop Ltd | Hospitality | 2025 |
| Mearns & Gill Holdings Limited | Financial services | 2023 |
| Mearns Lets Ltd | Real estate | 2022 |
| Mearns Property Investments Ltd. | Professional & scientific | 2019 |
| Measurement Consultants & Services Limited | Professional & scientific | 2007 |
| Mecca Trust Aberdeen Ltd | Other services | 2025 |
| MECH-7 Limited | Administrative & support | 2009 |
| Mechlinks Limited | Wholesale & retail | 2026 |
| Mechrec Limited | Information & communication | 2018 |
| Medaxis Supplier Ltd | Manufacturing | 2026 |
| Medesto Limited | Professional & scientific | 2016 |
| Medfluxara Ltd | Information & communication | 2026 |
| Medi One Training Ltd | Education | 2021 |
| Media Surgery Ltd | Information & communication | 2017 |
| Mediacraft Scot Limited | Professional & scientific | 2024 |
| Mediagorilla Limited | Professional & scientific | 2014 |
| Medica CSR Limited | Health & social care | 2024 |
| Medical Applications Limited | Administrative & support | 2014 |
| Medicaze Limited | Professional & scientific | 2024 |
| Medichek Docs Limited | Health & social care | 2024 |
| Mediterranean (Aberdeen) Limited | Hospitality | 2017 |
| Mediterranean Energy Services Limited | Administrative & support | 2002 |
| Mediterraneo MT Cafe Ltd | Wholesale & retail | 2021 |
| Megabit Labs Limited | Professional & scientific | 2012 |
| Megan Finlayson Consultancy Limited | Real estate | 2018 |
| Megan Wisely Interiors Limited | Professional & scientific | 2022 |
| Meganic Global Ltd | Professional & scientific | 2024 |
| Meglab Holdings Ltd | Administrative & support | 2026 |
| Mehrtech Ltd | Professional & scientific | 2023 |
| Meid Limited | Professional & scientific | 2024 |
| Mejj Consulting Ltd | Information & communication | 2018 |
| MEK TAY Ltd | Wholesale & retail | 2024 |
| Mekalatech Limited | Professional & scientific | 2024 |
| Melanessa LP | | 2014 |
| Melcal Marine UK Limited | Mining & quarrying | 2013 |
| Meldrum House Estates Limited | Construction | 1997 |
| Meldrum Projects Limited | Mining & quarrying | 2022 |
| Meldweld Ltd | Manufacturing | 2022 |
| Melios Ltd | Professional & scientific | 2011 |
| Mellatex LP | | 2014 |
| Melnyk Property Services Ltd | Construction | 2026 |
| Melrose Wind Limited | Energy | 2015 |
| Melville Business Consulting Limited | Professional & scientific | 2015 |
| Melville Cleaning Services Ltd | Administrative & support | 2023 |
| Memorial Specialists (Aberdeen) Limited | Other services | 1983 |
| Mennie Electrical Services Limited | Construction | 2025 |
| Mental Health Aberdeen | Health & social care | 1986 |
| Mental Health in Energy CIC | Other services | 2025 |
| Mentorix Services Ltd | Professional & scientific | 2025 |
| Mepra Ltd | Wholesale & retail | 2023 |
| Meraki Health Ltd | Other services | 2022 |
| Meraky Ltd | Administrative & support | 2021 |
| Mercat Homes Limited | Real estate | 1987 |
| Merch Leviticus Limited | Wholesale & retail | 2025 |
| Mercury Healthcare Solutions Ltd | Health & social care | 2020 |
| MERCURY7 Ltd. | Information & communication | 2015 |
| Merewood Consultancy Services Limited | Professional & scientific | 2015 |
| Meridian Joinery (Aberdeen) Limited | Construction | 2015 |
| Merk Industrial Solutions Limited | Professional & scientific | 2025 |
| Merkland (Aberdeen) Ltd | Wholesale & retail | 2023 |
| Mernagh Property Ltd | Real estate | 2021 |
| Merrydeen Ltd | Professional & scientific | 2022 |
| Merrymedia Ltd | Professional & scientific | 2020 |
| Mespac UK Limited | Administrative & support | 2023 |
| Messrs T & a Rennie Limited | Wholesale & retail | 2003 |
| Meta Sources Ltd | Wholesale & retail | 2022 |
| METABOLICO2 Ltd | Hospitality | 2025 |
| Metacor Holdings Limited | Professional & scientific | 2008 |
| Metcalfe & Metcalfe Company Ltd | Manufacturing | 2006 |
| Metering Styles Ltd | Professional & scientific | 2025 |
| Method Engineering & Consulting Ltd | Manufacturing | 2024 |
| Method Inventories Limited | Real estate | 2005 |
| Metrica International Ltd | Professional & scientific | 2025 |
| Metrol Technology (Brazil Holdings) Limited | Financial services | 2020 |