| 10M Diamond Oy | Transport & logistics | 2019 |
| Aarnituuli Avoin yhtiö | Other services | 2011 |
| Aito yhteys Oy | Other services | 2023 |
| Anmiil Oy | Financial services | 2014 |
| Aronkoski kommandiittiyhtiö | Real estate | 1990 |
| Atrata Oy | Real estate | 1989 |
| BP-Peltonen Ky | Administrative & support | 1985 |
| Betonilattiat Peltonen Oy | Construction | 1995 |
| Bioluup Oy | Water & waste | 2015 |
| CLT Plant Oy | Manufacturing | 2015 |
| CNC-Jyrsintuote Ojalehto Oy | Manufacturing | 1994 |
| Cont-2000 Oy | Transport & logistics | 1991 |
| Dogiter Oy | Other services | 2024 |
| E & M Farmipalvelu Oy | Agriculture & fishing | 2025 |
| E-P:n Kotitalkkarit Oy | Administrative & support | 2021 |
| E-P:n Maalaus- ja Pinnoitus Ky | Construction | 1999 |
| EAE Plan & Invest Oy | Professional & scientific | 2020 |
| Fysio Nodus Oy | Health & social care | 2021 |
| Greittek Oy | Manufacturing | 1988 |
| HaunPaikka Osk | Other services | 2017 |
| Hr. trade Oy | Wholesale & retail | 2020 |
| Hunajatila Mehiläislinna Avoin Yhtiö | Agriculture & fishing | 2018 |
| Huvikone Ky | Administrative & support | 2014 |
| Häjypoika oy | Manufacturing | 2021 |
| IKH Oy | Wholesale & retail | 1980 |
| IKH Retail Oy | Wholesale & retail | 1990 |
| Immocon Ky | Manufacturing | 1992 |
| J & J Saarinen Ky | Construction | 2011 |
| J Ala-Ikkelä Oy | Manufacturing | 1998 |
| JA-TO Asennus Oy | Manufacturing | 2023 |
| JI-Con Oy | Construction | 2026 |
| JKP Rakennus Oy | Real estate | 1979 |
| JL Serix oy | Administrative & support | 2010 |
| JL Vääntö Oy | Manufacturing | 2025 |
| JP-Tanhuanpää Oy | Agriculture & fishing | 1995 |
| JR-Romex Oy | Transport & logistics | 2008 |
| JRWerk OY | Professional & scientific | 2025 |
| Jalpa Oy | Manufacturing | 1980 |
| Jame Group Oy | Manufacturing | 2011 |
| Jaretec Ky | Administrative & support | 1998 |
| Jiikoo-Service Oy | Transport & logistics | 2020 |
| Jo-rakenne Oy | Manufacturing | 1982 |
| KA Control Oy | Professional & scientific | 2003 |
| Kajera OY | Hospitality | 2026 |
| KD-Works Ky | Manufacturing | 2013 |
| KPZ Group Oy | Arts & recreation | 2021 |
| KSM Kiinteistöt Oy | Wholesale & retail | 1991 |
| Karma Care Oy | Agriculture & fishing | 2024 |
| Kaskisten Tuulivoima Oy | Energy | 2012 |
| Kauhajoen Asunnot Oy | Real estate | 1993 |
| Kauhajoen Hautakivipalvelu avoin yhtiö | Manufacturing | 2013 |
| Kauhajoen KA-Huolto Oy | Other services | 1995 |
| Kauhajoen Kiinteistöhuolto Oy | Administrative & support | 2011 |
| Kauhajoen Laatuleipurit Oy | Manufacturing | 1997 |
| Kauhajoen Lustilankylän Vesiosuuskunta | Water & waste | 1966 |
| Kauhajoen Palvaamo Oy | Manufacturing | 2002 |
| Kauhajoen Sormiset Oy | Health & social care | 2006 |
| Kauhajoen Yrityspalvelu Oy | Professional & scientific | 2001 |
| Kauhajoki 20000 Oy | Financial services | 2003 |
| Kauhatec Ky | Wholesale & retail | 2013 |
| Kauran Teollisuuskiinteistö Oy | Real estate | 1982 |
| Keski-Mattila Oy | Agriculture & fishing | 2018 |
| Ketta Invest Oy | Financial services | 2024 |
| Kiinnike-Heinonen Oy | Wholesale & retail | 2009 |
| Kiinteistö Oy Kauhajoen Lehtiaro | Real estate | 1996 |
| Kiinteistö Oy Kauhajoen Puistola | Real estate | 1987 |
| Kiinteistö Oy Kauhajoen Tiklaksentie | Real estate | 1991 |
| Kiinteistö Oy Kauhajoen Vainiotalo | Real estate | 1977 |
| Kiinteistö Oy Kauhajoen Vainiotalo II | Real estate | 1978 |
| Kiinteistö Oy Kauhajoen Yhteistalo | Real estate | 2001 |
| Kiinteistö Oy Koivikko-Lisälä | Real estate | 1987 |
| Kiinteistö Oy Kuusisto | Real estate | 2006 |
| Kiinteistö Oy Lellavan Kortteeri | Real estate | 1990 |
| Kiinteistö Oy Olosmökit | Real estate | 2024 |
| Kiinteistö Oy Ostohovi | Real estate | 1992 |
| Kiinteistö Oy Villa Simonen | Real estate | 1999 |
| Kiinteistö Oy Virrankoski | Real estate | 1987 |
| Kiinteistöhuolto TMK Oy | Administrative & support | 2012 |
| Kiinteistöosakeyhtiö Pajalankulma | Real estate | 1979 |
| Koiviston Könttäpaja Oy | Other services | 2020 |
| Komelind Ltd Oy | Professional & scientific | 2002 |
| Kometos Oy | Manufacturing | 1991 |
| Konetyö Hietalahti Oy | Agriculture & fishing | 2020 |
| Koneurakointi Juha Mäensivu Oy | Construction | 2018 |
| Koria Group Oy | Real estate | 2016 |
| Koskenkylän Tuulienergia Oy | Energy | 2013 |
| Koskiaro Oy | Administrative & support | 2024 |
| Koskiniemen Puu Oy | Manufacturing | 2022 |
| Kultatarvas Oy | Mining & quarrying | 2016 |
| Kurren Kone- & Kiinteistö Palvelut Oy | Administrative & support | 2026 |
| LPT-Kiinteistöt Oy | Real estate | 2015 |
| La Bamba Oy | Hospitality | 1988 |
| LaXworks Oy | Other services | 2021 |
| LakRak Oy | Construction | 2013 |
| Lakeuden Aluesuojaus Oy | Construction | 2008 |
| Lakeuden Puutuote Oy | Manufacturing | 2004 |
| Lakeus Design Oy | Construction | 2012 |
| Lakeus-Works Ky | Professional & scientific | 2014 |
| Leo-Matti Ojala Oy | Manufacturing | 1975 |
| Lepume Oy | Construction | 2020 |