| Iin vuokratalot Oy | Real estate | 1979 |
| Insira Oy | Professional & scientific | 2006 |
| Invest Wiik Oy | Financial services | 2026 |
| Isomatalan Lohi Ky | | 1987 |
| J & J Karvonen Oy | Transport & logistics | 2013 |
| J&S Burger And Hertta Pub Oy | Hospitality | 2025 |
| J. Olkoniemi Oy | Other services | 2013 |
| JBE Service Group Oy | Administrative & support | 2022 |
| JHP Capital OY | Real estate | 2021 |
| JMT Machinery Oy | Wholesale & retail | 2023 |
| JOHTUPLAN Oy | Professional & scientific | 2008 |
| JTJ Kiinteistö Oy | Real estate | 2010 |
| Jastick Oy | Manufacturing | 2024 |
| Jirki Oy | Hospitality | 2020 |
| Jouhaa Oy | Financial services | 2026 |
| Juhan Taksipalvelu Oy | Transport & logistics | 2002 |
| Juhani Nenonen Oy | Wholesale & retail | 1985 |
| Juvicon Oy | Professional & scientific | 2020 |
| K-Tuuli Oy | Professional & scientific | 2021 |
| K-oy Ting Dong | Real estate | 2010 |
| Kakko Group OY | Wholesale & retail | 2026 |
| KH-Road Oy | Administrative & support | 2018 |
| KJ Korkala avoin yhtiö | Wholesale & retail | 2015 |
| KONEPASI Ky | Manufacturing | 2009 |
| KT-Service Oy | Manufacturing | 2014 |
| KTTM group Oy | Administrative & support | 2024 |
| Kampaamo HTS avoin yhtiö | Other services | 1990 |
| Kankaala Invest Oy | Financial services | 2020 |
| Karinpaikka, A & S Kari | Hospitality | 1987 |
| Katzon Oy | Financial services | 2019 |
| Kaustinen Solaris Oy | Energy | 2023 |
| Kempele Solaris Oy | Energy | 2023 |
| Kestokouru Oy | Construction | 2018 |
| Kiinteistö Oy Iin Kauppakeskus | Real estate | 2007 |
| Kiinteistö Oy Iin Kauppakulma | Real estate | 1991 |
| Kiinteistö Oy Iin Kumi | Real estate | 2006 |
| Kiinteistö Oy Leipojantie 4 | Real estate | 2020 |
| Kiinteistö-osakeyhtiö Iin Teletalo Oy | Real estate | 2005 |
| Kimmel Siivous- ja monipalvelut Oy | Administrative & support | 2026 |
| Kimwell Oy | Wholesale & retail | 2024 |
| Kitee Solaris Oy | Energy | 2023 |
| Klasila Group Oy | Construction | 1976 |
| Koistisen Korjaamo Oy | Other services | 1984 |
| Kolmiliina Oy | Professional & scientific | 2006 |
| Kone Jare Oy | Wholesale & retail | 2009 |
| Konehuolto Paakkola Oy | Manufacturing | 2019 |
| Koneurakointi Pekka Paakkari Oy | Construction | 2020 |
| Koninsaari Oy | Real estate | 1999 |
| Koskelan Laki Oy | Professional & scientific | 2014 |
| Koti-Apu Kruunu avoin yhtiö | Administrative & support | 2024 |
| Kouvola Solaris Oy | Energy | 2023 |
| Kulbet Oy | Transport & logistics | 1997 |
| Kuljetus H. Mustakangas Ky | Transport & logistics | 2007 |
| Kuljetus Häkkilä Oy | Construction | 2019 |
| Kuljetus Jonne Rajala Oy | Transport & logistics | 2008 |
| Kuljetus S.Virkkula Oy | Transport & logistics | 2026 |
| Kuljetus Taivaloja Ky | Transport & logistics | 2005 |
| Kuljetusliike Backman Oy | Transport & logistics | 1987 |
| Kulta-Aalto Ky | Wholesale & retail | 2004 |
| Kuolevala Oy | Education | 2019 |
| Kylmäpiiri Oy | Construction | 2023 |
| LK Kone Oy | Professional & scientific | 2023 |
| Lvi Onni OY | Construction | 2017 |
| LVI Pentti Pernu avoin yhtiö | Professional & scientific | 1991 |
| LVI-Asennus Kantola Oy | Construction | 2012 |
| Lvi-Kompania OY | Construction | 2023 |
| Liikuntakeskus Taffii Oy | Arts & recreation | 2025 |
| Lilon Group Oy | Construction | 2021 |
| Logidelive Oy | Professional & scientific | 2007 |
| Luostarinen Entertainment Oy | Professional & scientific | 2024 |
| Luottotieto Suomi Oy | Administrative & support | 2008 |
| ME Jokitalo Oy | Professional & scientific | 2021 |
| MHSat Oy | Information & communication | 2025 |
| Modura OY | Construction | 2017 |
| MRP Sales Oy | Financial services | 2026 |
| MaMi Hoitaa Oy | Hospitality | 2024 |
| Maalausliike Ari Eriksson Oy | Construction | 1990 |
| Maalausliike Pakanen Oy | Construction | 2009 |
| Maanrakennus Aleksi Ahola Oy | Construction | 2025 |
| Maastoporaus Ky | Construction | 1990 |
| Matka-Karvonen Ky | Transport & logistics | 2003 |
| Matleena Oy | Real estate | 1988 |
| Mauri Simoska Ky | Construction | 1986 |
| Meriankkuri Oy | Administrative & support | 2005 |
| Merikirjo Oy | Hospitality | 1991 |
| Meriperä oy | Real estate | 2022 |
| Merjo Ky | Administrative & support | 2011 |
| Metsäpalvelu Salmela Ky | Financial services | 2002 |
| Metsätoimisto Kuukkeli Oy | Agriculture & fishing | 2015 |
| Metsätyö Korpela Oy | Agriculture & fishing | 1977 |
| Mikkeli Solaris Oy | Energy | 2023 |
| Movie Company Alatalo Oy | Information & communication | 2002 |
| NHouse InWest Oy | Financial services | 2024 |
| Nelituulia Oy | Manufacturing | 2005 |
| Nelos-Grilli Ky | Real estate | 1985 |
| NiceFellas Oy | Arts & recreation | 2024 |
| Nivala Solaris Oy | Energy | 2023 |
| Nokikolari Lämsä Oy | Administrative & support | 2021 |
| Nordvalkea Oy | Health & social care | 2018 |
| Nurmes Solaris Oy | Energy | 2023 |