| A. Lamelli Oy | Manufacturing | 1996 |
| AgriAhola Oy | Agriculture & fishing | 2021 |
| Annsilvana Oy | Financial services | 1987 |
| Ari Tuomala Oy | Transport & logistics | 1996 |
| AuraLight369 Oy | Arts & recreation | 2025 |
| Auto Tuning Cars Star OÜ, sivuliike Suomessa | Wholesale & retail | 2019 |
| Auvorannan Kiinteistöt Oy | Real estate | 1996 |
| Cosmicon Oy | Professional & scientific | 1994 |
| ECF Palvelut Ky | Administrative & support | 2013 |
| Finntori Oy | Wholesale & retail | 2017 |
| Harri Kuukka Oy | Construction | 2017 |
| Hierontapalvelu Risto Sakko Oy | Other services | 2016 |
| Insinööritoimisto Risto Sakko Oy | Professional & scientific | 2000 |
| Klapi Japi Oy | Agriculture & fishing | 2021 |
| Konetyö Niemi Oy | Administrative & support | 1999 |
| Koskiantenni Ky | Construction | 1977 |
| Kovu Kiinteistöapu Oy | Administrative & support | 1996 |
| Kuljetusliike J. Tani Ky | Transport & logistics | 1982 |
| Kuljetusurakointi Noukkala Oy | Construction | 2014 |
| Kurenojan Kuljetus Oy | Transport & logistics | 2025 |
| Kymen Energiahake Oy | Agriculture & fishing | 2019 |
| Kympo Oy | Transport & logistics | 2011 |
| Lemmikkieläinliike Petsis Oy | Wholesale & retail | 2009 |
| M&M Pakkaus Oy | Manufacturing | 2016 |
| Maikone Oy | Construction | 2010 |
| Matomäen Autoromu Oy | Water & waste | 2015 |
| Mertala-Huusko Saneeraus Oy | Construction | 2026 |
| Mikkelän Maatila Oy | Agriculture & fishing | 2020 |
| Osuuskunta Hunaja-Kymi | Agriculture & fishing | 2015 |
| Pato Osakeyhtiö | Energy | 1952 |
| Pekka Töyrylä Ky | Mining & quarrying | 1995 |
| Rakennuspalvelu T. Valtonen Ky | Construction | 2015 |
| Ravintola Ummeljoki Ky | Hospitality | 2000 |
| Rowingfinn Oy | Arts & recreation | 2022 |
| Sinisalon Auto Oy | Transport & logistics | 2007 |
| Stall Rabbelugn Oy Ab | Agriculture & fishing | 2017 |
| Sähkö-Tele Matti Espo Oy | Construction | 2005 |
| Sähköpalvelu Jukka Naukkarinen Ky | Construction | 1998 |
| Tapiopuu ky | Construction | 1983 |
| Ummeljoen Autokorjaus P.A. Oy | Other services | 2011 |
| Veljekset Kuukka Kommandiittiyhtiö | Construction | 1981 |
| Voimapato Oy | Energy | 2013 |