| MYKA Yhtiöt Oy | Real estate | 2015 |
| Maalauspartio Oy | Construction | 2022 |
| Maanrakennus E. Majava Oy | Construction | 1984 |
| Maarakennus Sippala Oy | Transport & logistics | 1987 |
| Mainos MiPe Oy | Professional & scientific | 2014 |
| Mainoskimppa Ky | | 1986 |
| Marepharm Oy | Administrative & support | 2025 |
| Mari Rehula Oy | Wholesale & retail | 2011 |
| Markkinointi Sira Oy | Wholesale & retail | 1996 |
| Markkinointikeskus Olli Jokela Oy | Wholesale & retail | 1993 |
| Marra Oy | Administrative & support | 1989 |
| Matelan Sähkölaitehuolto Oy | Construction | 1989 |
| Matin Sähköpalvelu Oy | Construction | 2016 |
| Matix Oy | Information & communication | 2014 |
| Matti Hannuniemi Oy | Wholesale & retail | 1985 |
| Maveloto Oy | Wholesale & retail | 2024 |
| Megasport Kommandiittiyhtiö Lähdesmäet | Professional & scientific | 1990 |
| Merikuohu Oy | Professional & scientific | 1990 |
| Miilukangas Oy | Administrative & support | 1967 |
| Miilumachine Oy | Manufacturing | 2013 |
| Miilupipe Oy | Manufacturing | 2007 |
| Miilux Oy | Manufacturing | 1994 |
| Mondemila Oy | Information & communication | 2026 |
| Muoti-Sim Oy | Wholesale & retail | 1995 |
| Muotiliike Maj Ky | Wholesale & retail | 1950 |
| Mustanojan Kello Oy | Wholesale & retail | 1991 |
| MyEnglishTeacher.Fi Oy | Education | 2024 |
| Myllymäki Invest Oy | Financial services | 2008 |
| NB Solutions Oy | Manufacturing | 2018 |
| NK Building Oy | Construction | 2022 |
| Natavora Oy | Wholesale & retail | 2026 |
| Nekolla Oy | Financial services | 2020 |
| Niemen Liiketalot Oy | Real estate | 1993 |
| Nipan Neliöt Oy | Real estate | 1992 |
| NoCanPro Oy | Other services | 2012 |
| OXJ Oy | Professional & scientific | 2025 |
| Oivarch Oy | Professional & scientific | 2022 |
| Onleksi Oy | Construction | 1983 |
| Opti-Aika Järvelä Oy | Wholesale & retail | 1980 |
| Orfix Oy | Manufacturing | 1994 |
| Oulun Talosijoitus Oy | Financial services | 2007 |
| Ouluntien Autohuolto Oy | Other services | 2007 |
| Outstanding Training Equipment Oy | Manufacturing | 2020 |
| Oy Kuisman Tukku Ab | Wholesale & retail | 1985 |
| P&S Ahoketo Oy | Real estate | 2003 |
| P-Flagon Oy | Hospitality | 2006 |
| PP Sular Oy | Construction | 1976 |
| Painttis.fi Ky | Arts & recreation | 2011 |
| Palladium Kiinteistöt Oy | Real estate | 2012 |
| Pastmaster Oy | Financial services | 1997 |
| Pattijoen Autosähkökomponentti Ky | Wholesale & retail | 1992 |
| Pattijoen Huolto Oy | Energy | 1979 |
| Paulcon Oy | Professional & scientific | 2025 |
| Peetus Oy | Education | 1999 |
| Peltiseppa.com Raahe Oy | Manufacturing | 2023 |
| Peltisepänliike Eino Mikkilä Ky | Construction | 1981 |
| Pentti Hämeenaho Oy | Transport & logistics | 1977 |
| Pia ja Ari Alikaijala Oy | Financial services | 2006 |
| Piippolan Säästöhalli Oy | Wholesale & retail | 1989 |
| Piir-Pe Ky | | 1989 |
| Pikalinja Niemi Oy | Transport & logistics | 1967 |
| Pinganxile Oy | Hospitality | 2026 |
| Pintaveto Oy | Construction | 1995 |
| Pirjo Kujansuu Ky | Other services | 2002 |
| Pohjanmaan Projektiasennus Oy | Manufacturing | 1987 |
| Pohjanmaan Taksi Oy | Transport & logistics | 1993 |
| Pohjois-Suomen Taksi Oy | Transport & logistics | 2010 |
| Pohjolan Isännöintityö Oy | Real estate | 1986 |
| Pohjolan Kristalli Oy | Wholesale & retail | 1978 |
| Poke-Team Oy | Administrative & support | 2008 |
| Polq Oy | Professional & scientific | 2022 |
| Portti-Matti Oy | Manufacturing | 2017 |
| Potti Yhtiöt Oy | Financial services | 2010 |
| Presteel Oy | Manufacturing | 1997 |
| Pro Kulju Oy | Transport & logistics | 2014 |
| Promego Oy | Wholesale & retail | 2023 |
| Puhitsi Oy | Other services | 1981 |
| Putipuhdas Kotipalvelu Oy | Administrative & support | 2020 |
| Putte Oy | Administrative & support | 2007 |
| Puuhis Asunnot Oy | Real estate | 2020 |
| Puumesta Oy | Wholesale & retail | 2004 |
| Pyhäjoen Kaluste Ky | | 1986 |
| Päiväkoti Ilopirpana Oy | Education | 2015 |
| Päiväkoti Lystilinna Oy | Education | 2017 |
| R-taso Oy | Professional & scientific | 1985 |
| RI Kiinteistöt Oy | Real estate | 2017 |
| Raahe Invest Oy | Real estate | 2023 |
| Raahe Tilat Oy | Professional & scientific | 2007 |
| Raahen ART-Musiikki Ky | | 1986 |
| Raahen Askartelu- ja paperiliike Ky | Wholesale & retail | 1988 |
| Raahen Automaalaamo Oy | Other services | 2017 |
| Raahen Autotori Kiinteistöt Oy | Real estate | 2002 |
| Raahen Bitumikate Ky | Construction | 1983 |
| Raahen Burger Oy | Hospitality | 2009 |
| Raahen Diesel Heinonen ja Kumpp. | Wholesale & retail | 1961 |
| Raahen Energia Oy | Energy | 2000 |
| Raahen Fysioterapia Oy | Health & social care | 1988 |
| Raahen Habita Oy | Real estate | 2005 |
| Raahen Hoivatalot Oy | Real estate | 2023 |
| Raahen JUAN Avoin yhtiö | Manufacturing | 1990 |