| Makra Oy | Professional & scientific | 1989 |
| Makranka Oy | Financial services | 2025 |
| Makrofinn Oy | Administrative & support | 2004 |
| Maksuni Financial Services Oy | Information & communication | 2025 |
| Maksupiste oy | Hospitality | 2026 |
| Maku Factory Oy | Hospitality | 2018 |
| Maku Helsinki Oy | Hospitality | 2019 |
| Maku-Taku Oy | Hospitality | 2021 |
| Makua Group Oy | Administrative & support | 2021 |
| Makuhermoilijat Oy | Manufacturing | 2026 |
| Makuja Factory oy | Hospitality | 2020 |
| Makujen Maailma Oy | Wholesale & retail | 2020 |
| Makujen Taivas Oy | Hospitality | 2025 |
| Makumuisto oy | Hospitality | 2025 |
| Makunasi Oy | Wholesale & retail | 2026 |
| Makupiste Oy | Hospitality | 2024 |
| Makus Oy | Financial services | 1989 |
| Makutuomari Oy | Professional & scientific | 1990 |
| Makuworks Oy | Hospitality | 2025 |
| Malabar Ky | Professional & scientific | 1994 |
| Malaga Capital Oy | Financial services | 2022 |
| Malaga Madrid Oy | Hospitality | 2021 |
| Malary Oy | Health & social care | 2022 |
| Malbec Oy | Financial services | 1995 |
| Malena Oy | Manufacturing | 1995 |
| Maleva Betoni Oy | Construction | 2011 |
| Mali Num Oy | Hospitality | 2022 |
| Malia Oy | Financial services | 2011 |
| Malibra Oy | Hospitality | 2025 |
| Malibu Management Oy | Professional & scientific | 2023 |
| Malik Medical Oy | Health & social care | 2025 |
| Malik Oy | Professional & scientific | 1984 |
| Malimania Oy | Other services | 2023 |
| Malin Onnela Oy | Health & social care | 2020 |
| Malja Holdings Oy | Financial services | 2015 |
| Maljakivi Oy | Professional & scientific | 1984 |
| Maljanne Oy | Professional & scientific | 1991 |
| Maljuntalo Gold Oy | Financial services | 2022 |
| Malkit Oy | Wholesale & retail | 2003 |
| Mall Invest Oy | Financial services | 2024 |
| Mallikundit Oy | Professional & scientific | 2024 |
| Mallini Oy | Other services | 1990 |
| Malliton Oy | Information & communication | 2021 |
| Malliveistämö Muotopuoli Oy | Manufacturing | 2015 |
| Mallosjärvi Oy | Hospitality | 1987 |
| Mallow Oy | Information & communication | 2021 |
| Malls of Globe Oy | Information & communication | 2020 |
| Malma Oy | Transport & logistics | 1993 |
| Malmberg Software Oy | Information & communication | 2026 |
| Malmed Oy | Administrative & support | 2021 |
| Malmelin Oy | Other services | 1989 |
| Malmin Aluetyö Ky | | 1982 |
| Malmin Autokoulu Oy | Education | 1980 |
| Malmin Autokulma Ky | Transport & logistics | 1983 |
| Malmin Cafe Oy | Hospitality | 2024 |
| Malmin Kartanot Oy | Real estate | 2024 |
| Malmin Kiinteistökehitys Oy | Real estate | 2022 |
| Malmin Kiinteistöpalvelu Oy | Real estate | 1989 |
| Malmin Korupaja Oy | Wholesale & retail | 1995 |
| Malmin Lakiasiaintoimisto Oy | Real estate | 1984 |
| Malmin Lihakauppa Oy | Wholesale & retail | 2025 |
| Malmin Luontaistuote Oy | Wholesale & retail | 1985 |
| Malmin Memori Oy | Hospitality | 1993 |
| Malmin Mestari Oy | Hospitality | 2018 |
| Malmin Notariaatti Kommandiittiyhtiö | Professional & scientific | 2013 |
| Malmin Optiikka Oy | Wholesale & retail | 1982 |
| Malmin Palloiluhalli Oy | Arts & recreation | 1993 |
| Malmin RE-MA Sorvaus Oy | Manufacturing | 2001 |
| Malmin Ravintolat Oy | Hospitality | 2018 |
| Malmin Saha Oy | Manufacturing | 2015 |
| Malmin Talohuolto Oy | Real estate | 1966 |
| Malmin Terä Oy | Manufacturing | 2020 |
| Malmin Tilitoimisto Ky | Professional & scientific | 1996 |
| Malmin Työväentalo Osakeyhtiö | Real estate | 1939 |
| Malmin Valio-osa Oy | Wholesale & retail | 1985 |
| Malmin krouvi Oy | Hospitality | 2026 |
| Malmin yksityinen koulutus-, kuntoutus- ja terapiakeskus osakeyhtiö (Oy) | Education | 2002 |
| Malminhalli Oy | Real estate | 1962 |
| Malminharju Oy | Education | 2017 |
| Malminkadun Pysäköinti Oy | Transport & logistics | 1986 |
| Malminkartanon Fysikaalinen Hoitolaitos Fysioterapeutit Jaana Airaskorpi ja Tuija Virtanen OMT | Health & social care | 1982 |
| Malminkartanon autohuolto Oy | Other services | 1993 |
| Malminkartanon saneeraus Oy | Construction | 2021 |
| Malminportin Pysäköinti Oy | Real estate | 2004 |
| Malmintorin Silmätutkimuskeskus Oy | Health & social care | 1999 |
| Malmintorin Suutari Oy | Other services | 2025 |
| Malmirak Oy | Real estate | 1991 |
| Malmitec Oy | Administrative & support | 2008 |
| Malmitorin autopesula Oy | Other services | 2026 |
| Malmtrade Oy | Wholesale & retail | 1997 |
| Malter Oy | Construction | 2018 |
| Malvas Oy | Wholesale & retail | 2023 |
| Malverndemic Oy | Professional & scientific | 2024 |
| MamWork Oy | Administrative & support | 2012 |
| Mama & Mustekala Oy | Financial services | 2022 |
| Mama Group Oy | Financial services | 2022 |
| Mama Mem's Oy | Manufacturing | 2016 |
| Mama's Empanadas Oy | Hospitality | 2024 |
| Mamana Oy | Arts & recreation | 2021 |
| Mamark Oy | Financial services | 1987 |