| Mielitalo Oy | Real estate | 2025 |
| Mielle Media | Professional & scientific | 2022 |
| Mikko Koutaniemi Ky | Other services | 2016 |
| Mikko Vesala Ky | Transport & logistics | 1949 |
| MilSeven Oy | Professional & scientific | 2025 |
| MindBuffer Games Oy | Information & communication | 2020 |
| Minemo Oy | Manufacturing | 2023 |
| Minertec Oy | Mining & quarrying | 2022 |
| Mintili Oy | Administrative & support | 2026 |
| Mirko Sorvari Oy | Administrative & support | 2020 |
| Misaro Oy | Other services | 1997 |
| Mittarimato Oy | Professional & scientific | 2018 |
| Mixcontrol Oy | Construction | 1998 |
| Modann Oy | Hospitality | 2019 |
| Modeleon Oy | Information & communication | 2020 |
| Modlog Oy | Construction | 2019 |
| Moidom Oy | Health & social care | 2012 |
| Moimoi Travel Group Oy | Administrative & support | 2013 |
| Momin Travellers oy | Transport & logistics | 2025 |
| Monitoimimies Jaska Ky | Hospitality | 1991 |
| Moose River Capital Oy | Real estate | 2018 |
| Morse Finland Oy | Wholesale & retail | 2016 |
| Morse Kodintekniikka Oy | Wholesale & retail | 1987 |
| Moshtaghi Enterprise OY | Professional & scientific | 2020 |
| Mosquito Bay Oy | Professional & scientific | 2025 |
| Motiomax Oy | Professional & scientific | 2017 |
| Motokone, Olavi Jääskö Ky | | 1985 |
| Motopiste Oy | Professional & scientific | 2026 |
| Mtr Service Oy | Manufacturing | 2012 |
| Musiikki ja Radio Kuha Ky | | 1951 |
| Musiikkikauppacom Suomi Oy | Wholesale & retail | 2021 |
| Musiikkiterapeutti Tiina Meriluoto Oy | Education | 2008 |
| Musta Mestari Avoin yhtiö | Wholesale & retail | 2007 |
| Musta kaivo Oy | Other services | 2022 |
| MutsFit Oy | Health & social care | 2019 |
| Muuraus ja Laatoitus Peltola Oy | Construction | 2020 |
| Muuttopalvelu Puljula Oy | Transport & logistics | 2009 |
| MyLaplandTravel OY | Administrative & support | 2025 |
| Mywigo Oy | Administrative & support | 2020 |
| Myynti J.Yrjänheikki Oy | Financial services | 2024 |
| Myyntitalo Hakalat Oy | Professional & scientific | 2023 |
| Myyntitalo Routa Oy | Administrative & support | 2014 |
| N-M Koskela Consulting oy | Financial services | 2022 |
| N.Ravelin Oy | Administrative & support | 2024 |
| N/A Apartments Oy | Hospitality | 2024 |
| NAMS Oy | Hospitality | 2006 |
| NEK Kabel Finland Oy | Wholesale & retail | 2013 |
| NEdHo oy | Education | 2026 |
| NH Norrdigi Oy | Manufacturing | 2015 |
| NHS Asunnot Oy | Real estate | 2021 |
| NK-Logistiikka Rovaniemi Oy | Transport & logistics | 2003 |
| NLine Oy | Administrative & support | 2024 |
| NN Kiinteistöt Oy | Real estate | 2026 |
| Nord Survey OY | Professional & scientific | 2021 |
| NP Racing Oy | Arts & recreation | 2025 |
| NPR Rakennus OY | Construction | 2025 |
| Naapaset Ltd Oy | Manufacturing | 2020 |
| Nafta Films Oy | Information & communication | 2025 |
| Naisten alusasuliike Woman Ky | Wholesale & retail | 1989 |
| Namskis Oy | Hospitality | 2022 |
| Napapiiri Entertainment Oy | Arts & recreation | 2022 |
| Napapiiri Express Oy | Wholesale & retail | 1982 |
| Napapiiri Invest Oy | Real estate | 1992 |
| Napapiiri Restaurants Oy | Hospitality | 2026 |
| Napapiirin Arctic 24/7 Gym Oy | Arts & recreation | 2011 |
| Napapiirin Artesaani Leipä Oy | Hospitality | 2020 |
| Napapiirin Betoni Oy | Manufacturing | 1989 |
| Napapiirin Infra Oy | Construction | 2015 |
| Napapiirin Kiinteistönvälitys Oy | Real estate | 1997 |
| Napapiirin Kuituverkot Oy | Information & communication | 2016 |
| Napapiirin Kuljetus Oy | Transport & logistics | 1967 |
| Napapiirin Kylmähuolto Oy | Construction | 2006 |
| Napapiirin LVI & Rakennuspalvelu Oy | Construction | 2019 |
| Napapiirin Maanrakennus Oy | Construction | 2004 |
| Napapiirin Nuohous ja LVI Oy | Administrative & support | 2025 |
| Napapiirin Ovipaja Oy | Manufacturing | 2011 |
| Napapiirin Porofarmi Oy | Administrative & support | 1984 |
| Napapiirin Residuum Oy | Water & waste | 2002 |
| Napapiirin Sähkö Oy | Construction | 2016 |
| Napapiirin Talohuolto Oy | Administrative & support | 2020 |
| Napapiirin Tonttula Oy | Administrative & support | 1968 |
| Napapiirin Valomainos Oy | Professional & scientific | 2022 |
| Napapiirin Vesi Oy | Water & waste | 2015 |
| Napapiirin Ympäristöpalvelut Oy | Water & waste | 2026 |
| Napapiirin Yrityshallit Oy | Administrative & support | 1992 |
| Napapiirin konepalvelu OY | Construction | 2020 |
| Napapiirin taksi ja bussipalvelu Oy | Transport & logistics | 2007 |
| Napcon Ky | Manufacturing | 1985 |
| Napso Oy | Manufacturing | 2021 |
| Narkivirsu Oy | Agriculture & fishing | 1989 |
| Naruskan Siika Ky | Agriculture & fishing | 1985 |
| Nastok Oy | Wholesale & retail | 1993 |
| Nausteri Oy | Other services | 2020 |
| Nautilus Gym Finland Oy | Arts & recreation | 2000 |
| Naxia Oy | Information & communication | 2002 |
| Neluyi oy | Transport & logistics | 2025 |
| NettiRatti Oy | Education | 2023 |
| Nettiverstas Oy | Manufacturing | 2021 |
| Neve Arctic Infra Oy | Energy | 2021 |
| Neve Arctic Infrastructure Ky | Energy | 2021 |