| 1112 Käpyahot ja Välinen Oy | Wholesale & retail | 2014 |
| 1296 Jaana Välinen Oy | Wholesale & retail | 2014 |
| A. Björkbacka Oy | Wholesale & retail | 2004 |
| AA Ylikoski Oy | Agriculture & fishing | 2023 |
| AS Invest Oy | Financial services | 2024 |
| Aaltomari Ky | Wholesale & retail | 2009 |
| Ahon Sähköasennus Oy | Real estate | 1978 |
| Aimo Joensuu Oy | Financial services | 1964 |
| Alajärven Diesel-Korjaamo Ky | Other services | 1980 |
| Alajärven Huvilaveistämö Ky | Construction | 2005 |
| Alajärven Hyvinvointikiinteistöt Oy | Real estate | 2025 |
| Alajärven Kahvila Helmi Oy | Hospitality | 2023 |
| Alajärven Kotitekstiili Ky | Manufacturing | 1972 |
| Alajärven Kujalanpelto Oy | Professional & scientific | 1991 |
| Alajärven Lämpö Oy | Energy | 1982 |
| Alajärven Lääkintävoimistelu Oy | Health & social care | 1989 |
| Alajärven Maanrakennus Ky | Construction | 1987 |
| Alajärven Mailatehdas Oy | Real estate | 2017 |
| Alajärven Optiikka Oy | Wholesale & retail | 2021 |
| Alajärven Perunavarasto Oy | Transport & logistics | 1976 |
| Alajärven Rengashuolto Oy | Wholesale & retail | 2005 |
| Alajärven Seponkulma Oy | Real estate | 2000 |
| Alajärven Sähkö Oy | Energy | 1944 |
| Alajärven Tennis Oy | Arts & recreation | 1981 |
| Alajärven vesiosuuskunta | Water & waste | 1956 |
| Alakiinteistöt Oy | Real estate | 2014 |
| Alasähkö Oy | Construction | 1997 |
| Aleksi Peltoniemi Oy | Transport & logistics | 2017 |
| Allsell Oy | Professional & scientific | 2026 |
| Alvariini Oy | Hospitality | 2010 |
| Anilo Oy | Education | 2021 |
| Annin Maaseutuapu Oy | Administrative & support | 2016 |
| Antonila Oy | Construction | 2013 |
| Antti Keltikangas Oy | Transport & logistics | 2002 |
| Arkkitehtitoimisto Tuomela Ky | Professional & scientific | 2000 |
| Artopine Oy | Manufacturing | 1985 |
| Artowood Oy | Manufacturing | 1993 |
| Asennuspalvelu N. Lehtola Oy | Construction | 2001 |
| Auto ja Huolto Ky Jukka Kangastie | Wholesale & retail | 2000 |
| Autopaja J. Nuolikoski Ky | Other services | 1985 |
| Autosähkö Arvo Männikkö Oy | Other services | 1984 |
| Autoyhtymä Mertaniemi Oy | Transport & logistics | 2004 |
| Benzon Oy | Wholesale & retail | 2014 |
| Betoniteollisuuden Tukku Oy | Wholesale & retail | 2021 |
| Cars Perho Oy | Wholesale & retail | 2011 |
| Casaava Oy | Construction | 2011 |
| Cloudberry RL Oy | Professional & scientific | 2015 |
| Coachtalli Oy | Financial services | 2017 |
| Comet Custom Oy | Wholesale & retail | 1989 |
| DSO Oy | Manufacturing | 2024 |
| Doranpa Oy | Hospitality | 2016 |
| Downlake Oy | Wholesale & retail | 2017 |
| Eero J. Hämäläinen Oy | Agriculture & fishing | 2013 |
| Eko-Erotus Oy | Manufacturing | 2013 |
| FinnKatsastus Oy | Professional & scientific | 2010 |
| FishLand Oy | Manufacturing | 2023 |
| Flow Island Oy | Education | 2015 |
| Foreground Oy | Financial services | 2026 |
| Gymrail Health Oy | Manufacturing | 2022 |
| Hakeda Oy | Water & waste | 2022 |
| Hallisepät KRS Oy | Construction | 1996 |
| Hanhisalon Kutomo Oy | Manufacturing | 1977 |
| Hannu Linnanmäki Oy | Transport & logistics | 2008 |
| Hansal Invest Oy | Financial services | 2024 |
| Harjun Auto Oy | Other services | 2017 |
| Healthcare Safety Solutions Oy | Information & communication | 2020 |
| Heikki Niemi Oy | Wholesale & retail | 2004 |
| Hertus Oy | Agriculture & fishing | 1979 |
| Heta Hoivapalvelut Oy | Health & social care | 2022 |
| Hetcom Oy | Wholesale & retail | 2025 |
| Hetplan Oy | Construction | 1990 |
| Hionta - Oksa Oy | Manufacturing | 2005 |
| Hirsityö Varila Oy | Manufacturing | 2001 |
| Hius-Team Tiina Ky | Other services | 1993 |
| Huoltokorjaamo E.Rantala Ky | Manufacturing | 1985 |
| Huoltoliike Pentti Hautakangas Oy | Construction | 1989 |
| Hyöty-Puoti Oy | Wholesale & retail | 1979 |
| Hämeenniemen Sementtivalimo Ky | Manufacturing | 1982 |
| Höri Oy | Construction | 1983 |
| IV-PIRISTE Ky | Construction | 2015 |
| InnoVisual Oy | Information & communication | 2025 |
| Innocard Suomi Oy | Wholesale & retail | 2014 |
| Invekas Oy | Financial services | 1988 |
| Isoniemen Turve Oy | Mining & quarrying | 2011 |
| JAPO osk | Information & communication | 1925 |
| JJJ Jaloste Oy | Wholesale & retail | 2022 |
| JKH Pakka Oy | Administrative & support | 2025 |
| JTK-Invest Oy | Real estate | 2023 |
| Jamin Palvelut Oy | Education | 2016 |
| Jarmo Seppälä Oy | Real estate | 2010 |
| Jo-Ha Kiinteistöt Oy | Real estate | 2015 |
| Joka-Talo Invest Oy | Real estate | 2014 |
| Josak Oy | Financial services | 1989 |
| Järvi-Pohjanmaan Viestintä Oy | Information & communication | 1998 |
| Järvi-Pohjanmaan Yrityspalvelu Oy | Professional & scientific | 1993 |
| JärviPadel Oy | Arts & recreation | 2025 |
| JärviS-Energia Oy | Energy | 2019 |
| Järvialueen Perunamiehet Oy | Administrative & support | 2001 |
| Järvimarket Oy | Real estate | 1972 |
| Järvinet Oy | Information & communication | 2002 |