| Jahmu-Sijoitus Oy | Financial services | 2011 |
| Janmotor Ky | Manufacturing | 2001 |
| Jatohuolto Oy | Manufacturing | 2023 |
| Jelcon Oy | Transport & logistics | 2021 |
| Jime Oy | Manufacturing | 1988 |
| Jing Men Oy | Hospitality | 2019 |
| JoTu-Kiinteistöt Oy | Real estate | 2006 |
| Jokirannikon Osuuspankki | Financial services | 1914 |
| Jonura Oy | Construction | 2024 |
| Jot-Rent Oy | Administrative & support | 1991 |
| Joupet Oy | Construction | 2009 |
| Joutsenlaulu Oy | Administrative & support | 2022 |
| Juelma Oy | Real estate | 2021 |
| Juhlaguru tapahtumapalvelut Oy | Professional & scientific | 2019 |
| Jäljen Jättiläinen Ky | Professional & scientific | 2017 |
| JääMeri Tuotanto Ky | Information & communication | 2007 |
| K. Siponen Ky | Wholesale & retail | 1989 |
| K2TJ Capital Oy | Professional & scientific | 2020 |
| KFM Service Oy | Manufacturing | 2016 |
| KL1-GROUP OY | Construction | 2011 |
| KPP-service Oy | Manufacturing | 2023 |
| KTH-auto Oy | Wholesale & retail | 2019 |
| Kadso Oy | Information & communication | 2022 |
| Kahavinkka Ky | Hospitality | 2017 |
| Kalajoen Autohajottamo Sinkkonen ja Lankila, avoin yhtiö | | 1979 |
| Kallioluoman Veljespirtti Oy | Agriculture & fishing | 1993 |
| Kankalar Ky | Hospitality | 2008 |
| Karhun kirja & paperi Oy | Wholesale & retail | 2021 |
| Kari Jääskeläinen Ky | Wholesale & retail | 1990 |
| Katrin Kauppa Ky | Wholesale & retail | 2017 |
| Katti Pub Ky | Hospitality | 1991 |
| Kauppalainen Oy | Manufacturing | 2006 |
| Kellola Group Oy | Professional & scientific | 2024 |
| Kellola Metsä Oy | Agriculture & fishing | 2022 |
| Kellola Rock Oy | Construction | 2007 |
| Kempeleen Kunnostus Oy | Construction | 1989 |
| Kiesi-Ravintolat avoin yhtiö | Real estate | 2018 |
| Kiinteistö Oy Kummatti | Real estate | 1987 |
| Kiinteistö Oy Padel Finland Raahe | Real estate | 2021 |
| Kiinteistö Oy Raahen Antinkatu | Real estate | 1983 |
| Kiinteistö Oy Raahen Liiketalo | Real estate | 1988 |
| Kiinteistö Oy Raahen Muurarinkatu 4 | Real estate | 2016 |
| Kiinteistö Oy Raahen Pro Kiinteistöt | Real estate | 2017 |
| Kiinteistö Oy Raahen Sisustustalo | Real estate | 1993 |
| Kiinteistö Oy Raahen Tarviketalo | Real estate | 1985 |
| Kiinteistö Oy Raahen Uimahallintie | Real estate | 2016 |
| Kiinteistö Oy Raahen Yritystalo | Real estate | 1989 |
| Kiinteistö Oy Sepän Asema | Real estate | 2013 |
| Kiinteistö Oy Sepän Paja | Real estate | 2013 |
| Kiinteistöyhtiö Huoltokatu 8 Oy | Real estate | 2012 |
| Kikahees Oy | Hospitality | 2016 |
| Kipare Oy | Real estate | 2006 |
| Kirja & Kasetti Olli Jokela Ky | Wholesale & retail | 1991 |
| Kodinaika Oy LKV | Real estate | 2012 |
| Kodinkonehuolto Pee Tee Ky | Other services | 1995 |
| Koma Oy | Real estate | 2010 |
| Kommandiittiyhtiö Sähködiesel P. Rekilä | Wholesale & retail | 1974 |
| Konehuolto Paakkari Oy | Manufacturing | 2025 |
| Koneistamo Kultala Oy | Manufacturing | 2004 |
| Konetrio Oy | Construction | 2021 |
| Korhosen Hautaustoimisto ja Kukkatalo Oy | Other services | 1994 |
| Korsu Ovet Oy | Manufacturing | 2011 |
| Korsu Oy | Transport & logistics | 1950 |
| Kotiset Ky | Wholesale & retail | 1995 |
| Krekilä Invest Oy | Financial services | 2020 |
| Kuljetus A & R Bäckman Ky | Transport & logistics | 1998 |
| Kuljetus Haikara Oy | Transport & logistics | 1985 |
| Kuljetusliike Välijärvi Ky | | 1984 |
| Kuljetuspalvelu K. Niemi Ky | Transport & logistics | 1983 |
| Kumpele Oy | Professional & scientific | 1997 |
| Kuntokeskus Raahe Oy | Arts & recreation | 2018 |
| Kuntokeskus Sisu Oy | Arts & recreation | 2014 |
| Kuntoparkki Oy | Health & social care | 1998 |
| Kuntoutuskeskus Special Oy | Health & social care | 1986 |
| Kuva Lenita Oy | Professional & scientific | 1979 |
| Kykysi loistaa oy | Professional & scientific | 2025 |
| Kylpyri Oy | Construction | 2015 |
| Kärkihuolto Oy | Construction | 2018 |
| LVI Nikki & Toppila Oy | Construction | 2010 |
| Lakelux Oy | Real estate | 2000 |
| Lang Raahe Oy | Financial services | 2022 |
| Langin Kauppahuone Oy | Hospitality | 2017 |
| Lappi Sijoitus Oy | Administrative & support | 2008 |
| Latermo Ky M. Tyybäkinoja | | 1982 |
| Leea Leppilampi Oy | Education | 2023 |
| Lehtosalo JOTAS Oy | Financial services | 2004 |
| Leo Sivula Ky | Wholesale & retail | 1976 |
| Liidaamo Ky | Administrative & support | 1987 |
| Lin Yu Oy | Hospitality | 2015 |
| LineUp Glamour Oy | Manufacturing | 2023 |
| Lintukoto lastenvaateliike Oy | Wholesale & retail | 2018 |
| Logistiikkaoperaattorit Logop Oy | Transport & logistics | 2003 |
| Loma-Viisikot Oy | Real estate | 1990 |
| Loma-asunto Pyhä-Pietari Oy | Real estate | 1994 |
| Lotta Roots Oy | Information & communication | 2020 |
| M Rusko Ky | Transport & logistics | 1986 |
| M. Heilala Ky | Construction | 1984 |
| MHV-Kuljetus Oy | Transport & logistics | 2013 |
| MM Wealth Oy | Financial services | 2026 |
| MR Doors & Windows Oy | Wholesale & retail | 2019 |