| M. Mäki Ky | Transport & logistics | 1992 |
| M. Raittinen Ky | Transport & logistics | 2000 |
| M. Urho Oy | Administrative & support | 2021 |
| M. Uussaari Oy | Construction | 2002 |
| MDComprex Oy | Wholesale & retail | 2012 |
| MHW-Consulting Oy | Professional & scientific | 2018 |
| MJ-Trans Oy | Transport & logistics | 2008 |
| MMA- Sähkötekniikka Oy | Construction | 2025 |
| MPT-Asennus Oy | Construction | 2002 |
| MPT-Invest Oy | Manufacturing | 1999 |
| MV-Forest Oy | Agriculture & fishing | 2021 |
| Maamasina Ky | Manufacturing | 2001 |
| Maansiirtoliike Tapani Junnila Ky | Construction | 1987 |
| Maatalouskonehuolto Sillantaka Oy | Manufacturing | 2009 |
| Mabrocona Nord Oy | Manufacturing | 2025 |
| Maderosso Invest Oy | Real estate | 2007 |
| Maderosso Oy | Real estate | 2002 |
| Maderosso Works Oy | Construction | 2007 |
| Maikaar Oy | Manufacturing | 1989 |
| Marko Rintanen Oy | Transport & logistics | 1995 |
| Martelius Exhaust Oy | Manufacturing | 2015 |
| Massa Mesta Oy | Other services | 1996 |
| Matikan Puutarha Oy | Agriculture & fishing | 2021 |
| Matti Leiniö Oy | Financial services | 2021 |
| Matto- ja Maalaustyö J-P Salminen Ky | Construction | 1990 |
| Meifus Oy | Construction | 2026 |
| Merituulia Mentoring Oy | Other services | 2025 |
| Metalli Mäkilä Ky | Manufacturing | 2007 |
| Metallityö Vuorio Ky | Construction | 1990 |
| Mikolan Tila Oy | Agriculture & fishing | 2018 |
| Miles Flight Training Oy | Transport & logistics | 2008 |
| MinLuc Oy | Construction | 2021 |
| Mint Disc Oy | Financial services | 1986 |
| Mircan Oy | Hospitality | 2025 |
| Mivepa Oy | Manufacturing | 2006 |
| Moneymakers Team Oy | Professional & scientific | 2000 |
| Moto-Olli Oy | Agriculture & fishing | 1998 |
| Mullimäki Oy | Agriculture & fishing | 2015 |
| Munax Oy | Wholesale & retail | 2003 |
| My Way Finland Oy | Other services | 2026 |
| Myyki Oy | Manufacturing | 1993 |
| Mäki Group Oy | Professional & scientific | 2021 |
| Mäkinen Yhtiöt Oy | Financial services | 2014 |
| NELFIN Oy | Wholesale & retail | 2014 |
| NL masterplan oy | Professional & scientific | 2019 |
| Naps Aurinkovoimala Oy | Energy | 2018 |
| Naps Solar Oy | Wholesale & retail | 2001 |
| Need For Needle Oy | Other services | 2023 |
| NetWaltt Oy | Information & communication | 2016 |
| Nikanor Oy | Agriculture & fishing | 2001 |
| Nilarco Oy | Construction | 2009 |
| Nilogia Oy | Professional & scientific | 2015 |
| Nätti-Röijy Oy | Manufacturing | 1985 |
| O & R Eriksson Ky | Wholesale & retail | 1990 |
| OK Metallirakenne ja Kone Oy | Manufacturing | 2026 |
| Ohjelmanurkka Oy | Professional & scientific | 2012 |
| Oivaporras Oy | Manufacturing | 2019 |
| Omavoima Oy | Energy | 2008 |
| Ovi- ja Rakennuspalvelu Sakari Vainio Ky | Wholesale & retail | 1984 |
| Oy AAJ-Pipe Ltd | Manufacturing | 2005 |
| Oy Atlas Skin LTD | Wholesale & retail | 2026 |
| Oy Paratiisinsirius | Real estate | 1977 |
| Oy Picea Ab | Wholesale & retail | 1990 |
| Oy Rakenne Rinne Ltd | Construction | 1997 |
| PALIKKA TECHNIX INTERNATIONAL LTD Oy | Professional & scientific | 2016 |
| PS Processing Oy | Water & waste | 2011 |
| Palkax Oy | Professional & scientific | 2025 |
| Palmusen tila Oy | Agriculture & fishing | 2001 |
| Papinsaarentila Oy | Agriculture & fishing | 2022 |
| Pauli Heijari Oy | Wholesale & retail | 1997 |
| Pelti ja Saneeraus Wasiljeff Oy | Construction | 2016 |
| Peltosen koneistus- ja polttoleikkauspalvelu Ky | Manufacturing | 1990 |
| Picea Holding Oy | Financial services | 2024 |
| Picodet Oy | Wholesale & retail | 2005 |
| Piha-Apinat Oy | Construction | 2018 |
| Pihlatek Oy | Other services | 1994 |
| Pintaremontointi Elo Oy | Construction | 2022 |
| Pochen Oy | Real estate | 1996 |
| Pohjois-Suomen Energiamurskaus Oy | Transport & logistics | 2012 |
| Pohjoiskulman vesiosuuskunta | Water & waste | 2010 |
| Polapek Oy | Financial services | 1999 |
| Polat Bolero Oy | Hospitality | 2018 |
| Poraus ja sahaus Kangasniemi Oy | Construction | 2021 |
| Premetals Ky | Construction | 2005 |
| Project Tube Green Tech Oy | Manufacturing | 2025 |
| Project Tube Oy | Construction | 2014 |
| Projectech Oy | Wholesale & retail | 2002 |
| Pronssi & Kivi Oy | Manufacturing | 2002 |
| Psykologipalvelu Juha Laitala Oy | Health & social care | 2024 |
| Pulmaton Oy | Information & communication | 2011 |
| Pulmaton Solutions Oy | Information & communication | 2013 |
| Puurax Olli Rantapere Ky | Wholesale & retail | 1990 |
| Puurusen Sähkö Oy | Construction | 2002 |
| Pääsiäismaa Oy | Professional & scientific | 1997 |
| RR Yhtiöt OY | Manufacturing | 2023 |
| RS-muovi Oy | Manufacturing | 2010 |
| RSS Metalworks Oy | Administrative & support | 2024 |
| RSS-Auto Oy | Wholesale & retail | 2013 |
| Radiotalo Iiskala Oy | Wholesale & retail | 1967 |
| Raigrön Oy | Real estate | 2024 |