| AELMICON Oy | Professional & scientific | 1998 |
| ATKO Oy | Other services | 2026 |
| Affebon Oy | Manufacturing | 2007 |
| Alikärrin Maatila Oy | Agriculture & fishing | 2019 |
| Ammatillinen perhekoti Pähkinäpensas oy | Health & social care | 2007 |
| Ari Anttila Oy | Wholesale & retail | 1999 |
| Asennusliike Lubcar Ky | Other services | 1987 |
| Asvatec Oy | Construction | 2011 |
| Autokorjaamo P. Kanasuo Ky | Real estate | 1981 |
| AutonomousSpark Oy | Administrative & support | 2020 |
| Cosmetic Haven Oy | Wholesale & retail | 2023 |
| Del-Horses, avoin yhtiö | Education | 2017 |
| Divik Oy | Administrative & support | 2023 |
| EKalle-Kuljetus Oy | Transport & logistics | 2004 |
| Ekte Leaders Oy | Professional & scientific | 2022 |
| Elemika Oy | Construction | 1998 |
| Energiakaruselli Oy | Professional & scientific | 2011 |
| Escoach Oy | Wholesale & retail | 1994 |
| Everwood Holdings Oy | Financial services | 2023 |
| Farmi Kuusela Oy | Agriculture & fishing | 2025 |
| Farmi Nummela Oy | Agriculture & fishing | 2004 |
| Farmi Tilatech Oy | Wholesale & retail | 2021 |
| Fermas Oy | Professional & scientific | 2019 |
| Fiarell Oy | Manufacturing | 2013 |
| Fortitude Ky | Health & social care | 1982 |
| Green Automation Group Oy | Wholesale & retail | 2010 |
| Hallitech Oy | Construction | 2020 |
| Hannu Posti Ky | Administrative & support | 1989 |
| Hinausykkönen Oy | Transport & logistics | 2016 |
| Hongiston Taimisto Oy | Agriculture & fishing | 2007 |
| Huttula Agri Oy | Agriculture & fishing | 2025 |
| Huttulan Kukko Oy | Manufacturing | 2018 |
| Huttulan Maatila Oy | Real estate | 2022 |
| Huttulan Tila Oy | Real estate | 2022 |
| Härkätien Palvelut Oy | Construction | 2020 |
| IiHoo Oy | Professional & scientific | 2024 |
| Ilmastointi Mega Oy | Construction | 2016 |
| JJ Tamminen Oy | Agriculture & fishing | 2018 |
| JLA-Tech Oy | Construction | 2009 |
| JT-Nisu Oy | Agriculture & fishing | 2017 |
| Jtv-Trading Oy | Transport & logistics | 1994 |
| Juha-Pekka Munkki Ky | Wholesale & retail | 1984 |
| Juhlapalvelu Tanja Leino Oy | Hospitality | 2013 |
| KA-Rengas Oy | Wholesale & retail | 2015 |
| Koski Engineering OY | Professional & scientific | 2018 |
| KSC Nordic Ab | Wholesale & retail | 2012 |
| Kaivuu-urakointi Kari Koskinen Oy | Construction | 2012 |
| Kallary Design Oy | Professional & scientific | 2020 |
| Kamikatse Oy | Professional & scientific | 2026 |
| Kara-Turve Oy | Mining & quarrying | 2007 |
| Kari Tiensuu Ky | Manufacturing | 1997 |
| Katsastus Koski Oy | Professional & scientific | 2021 |
| Kemek Oy | Real estate | 2020 |
| Kiinteistö Oy Kosken Isokuovintie 3 | Real estate | 2019 |
| Kiinteistö Oy Kosken Liikenneasema | Wholesale & retail | 2013 |
| Kiinteistö Oy Puurtajantie 35B | Construction | 2017 |
| Kiinteistöosakeyhtiö Tuunaankartano | Real estate | 2011 |
| KoneCustom Oy | Other services | 2023 |
| Koneurakointi A. Kärri Oy | Construction | 2024 |
| Kosken Aluelämpö Oy | Energy | 2010 |
| Kosken Autohuolto Oy | Wholesale & retail | 1995 |
| Kosken Autokeskus Oy | Transport & logistics | 2017 |
| Kosken Autokulma Oy | Professional & scientific | 2017 |
| Kosken Betonielementti Oy | Manufacturing | 2008 |
| Kosken Krouvi Oy | Hospitality | 2023 |
| Kosken Multajaloste Oy | Mining & quarrying | 1975 |
| Kosken Osuuspankki | Financial services | 1918 |
| Kosken Rakennustarvike Oy | Wholesale & retail | 1991 |
| Kosken Rengashuolto M & P Hakamäki Oy | Wholesale & retail | 1997 |
| Kosken Sähkö Oy | Construction | 1995 |
| Kosken TiliKiinteistö Oy | Professional & scientific | 2009 |
| Kuljetus T. Vainio Oy | Transport & logistics | 2015 |
| Kuljetus Vaparanta avoin yhtiö | Transport & logistics | 2022 |
| Kuljetusliike M. Kytölä Oy | Transport & logistics | 1997 |
| Kuljetusliike S. Kakko Oy | Transport & logistics | 1978 |
| Kuovin Kiinteistö Oy | Real estate | 2012 |
| Kymppitaito Oy | Manufacturing | 1993 |
| Lapir OY | Health & social care | 2009 |
| Laitehuolto Tiensuu Oy | Manufacturing | 2024 |
| Lapinaro Oy | Agriculture & fishing | 2018 |
| LinjaTec Oy | Construction | 2022 |
| Lounas & Bar Akseli Oy | Hospitality | 1995 |
| Lännen Joulukuusikauppa Oy | Wholesale & retail | 2014 |
| Lännen Laatulastaus Oy | Agriculture & fishing | 2018 |
| Löyly Health Oy | Health & social care | 2023 |
| ML-Kiinteistöt Oy | Real estate | 2007 |
| MV Asennus ja Rakennus Ky | Manufacturing | 2012 |
| Maaseudun Notariaatti Oy | Real estate | 2009 |
| Mannin Juhlanavetta Oy | Real estate | 2023 |
| Metsäurakointi Mikkola Oy | Agriculture & fishing | 2017 |
| Monitoimi Simola avoin yhtiö | Construction | 2017 |
| Neverno Oy | Professional & scientific | 2026 |
| Next Level Media Oy | Professional & scientific | 2024 |
| Nordic M Consulting Oy | Financial services | 2026 |
| Norkinnis Oy | Construction | 2026 |
| Nuves Oy | Wholesale & retail | 2014 |
| Ojarannan Rakennus Oy | Construction | 1996 |
| Opal Oy | Wholesale & retail | 2023 |
| Oy Bonum Dies Ab | Administrative & support | 2022 |
| Oy Bonum Vitae Ab | Wholesale & retail | 2018 |