| Ahoua Oy | Transport & logistics | 2019 |
| Air Pipe Kouvola Oy | Administrative & support | 2012 |
| Autohuolto Railway Garage Oy | Other services | 2021 |
| Brolas Invest OY | Real estate | 2021 |
| Big Atlas Voikkaa Oy | Hospitality | 2023 |
| Brote Europa Oy | Wholesale & retail | 2024 |
| DCS Cleantech Oy | Manufacturing | 1984 |
| Daiwa Sports Limited, Suomen sivuliike | Wholesale & retail | 2015 |
| Determinova Oy | Professional & scientific | 2026 |
| EU-Sähkö Oy | Construction | 1992 |
| EasyEA Oy | Education | 2024 |
| Emline Oy | Administrative & support | 2010 |
| EnergyWise Oy | Energy | 2022 |
| Enertum Oy | Education | 1990 |
| Eraamo Oy | Other services | 2026 |
| Espon Autot ja Kuljetus Oy | Transport & logistics | 2015 |
| Espon Taksipalvelut Ky | Transport & logistics | 2003 |
| Feel The Wood Oy | Real estate | 2024 |
| FinnGTL Oy | Manufacturing | 2012 |
| Fleetti Oy | Information & communication | 2025 |
| Hanne Laurila Ky | Wholesale & retail | 2007 |
| He-Tech Ky | Construction | 2014 |
| HelloTidy Oy | Administrative & support | 2025 |
| Hirvelän Rahti Ky | Transport & logistics | 2005 |
| JKO-rakennus Oy | Construction | 2012 |
| JM auto Parts Oy | Other services | 2025 |
| JM-Pipeline Oy | Construction | 2011 |
| Jenny's Design Oy | Professional & scientific | 2022 |
| Juha Kukkola Oy | Construction | 2020 |
| Jukka Iiskola Oy | Agriculture & fishing | 2010 |
| Kiinteistö OY Kyttärintie 31 | Real estate | 2003 |
| KK Huoltoapu oy | Other services | 2024 |
| KS-Trade Ky | Professional & scientific | 1994 |
| Kartano Koskenranta Ky | Hospitality | 2010 |
| Kiinteistö Oy Kuusankosken Korjaamo | Real estate | 2003 |
| Koivuteos Oy | Manufacturing | 2005 |
| Konkeli Oy | Real estate | 2015 |
| Kotiapu Mynttinen Oy | Health & social care | 2022 |
| Kouvolan Kotikulma Oy, LKV | Real estate | 2010 |
| Kouvolan valosiru Ky | Wholesale & retail | 1993 |
| Kuljetus J&T Eklöf Oy | Transport & logistics | 2021 |
| Kuusaan Pintakate Oy | Construction | 1994 |
| Kuusaan Raudoite Oy | Construction | 2001 |
| Kuusaan Romu Oy | Wholesale & retail | 2020 |
| Kuusaan Talohuolto Ky | Administrative & support | 1991 |
| Kymen AurinkoEnergia Oy | Construction | 2022 |
| Kymen Kiinteistöpalvelu Oy | Real estate | 1987 |
| Kymen Kiviasennus Oy | Construction | 1999 |
| Kymen Kivipojat Oy | Manufacturing | 2006 |
| Kymen Metallipalvelu Oy | Manufacturing | 1987 |
| Kymen PC-Tuki Oy | Wholesale & retail | 1991 |
| Kymen Selluvilla Asennus Oy | Construction | 2007 |
| Lab-Ace OY | Professional & scientific | 2016 |
| Lahden Raskaspesu Oy | Transport & logistics | 2003 |
| Lampila Golf Oy | Arts & recreation | 2004 |
| Laso-Huolto Oy | Information & communication | 2016 |
| Lintukymin Vesihuolto-osuuskunta | Water & waste | 2010 |
| M.T.Motorworks Oy | Other services | 2019 |
| MAK-Konsultointi Oy | Professional & scientific | 1994 |
| MS Virtakivi OY | Hospitality | 2019 |
| Manner Kahvila Oy | Hospitality | 2009 |
| Mediakajo osk | Professional & scientific | 2004 |
| Mellenion Oy | Professional & scientific | 2025 |
| Mikey's County Cars Oy | Wholesale & retail | 2010 |
| Ninersec Oy | Administrative & support | 2013 |
| Niti Kiinteistöt Oy | Real estate | 2022 |
| OOMukana Oy | Health & social care | 2024 |
| Officenter Oy | Wholesale & retail | 2020 |
| Oracon Oy | Professional & scientific | 2009 |
| Oy Webbsongs Ltd. | Information & communication | 1998 |
| Parallines OY | Professional & scientific | 2013 |
| PST-Moduulirakenne Oy | Construction | 2026 |
| Piis Of Keik Oy | Manufacturing | 2020 |
| Pikatilat Oy | Administrative & support | 1986 |
| Provito Oy | Arts & recreation | 2009 |
| Puoliakustinen Osk | Arts & recreation | 2024 |
| Putkivo Oy | Construction | 2022 |
| Radantauksen Hallit Oy | Manufacturing | 1996 |
| Radanvarsi service Oy | Real estate | 2023 |
| Rakennusliike STG Oy | Construction | 2026 |
| SH Racing Oy | Arts & recreation | 2010 |
| SJ Service Avoin yhtiö | Administrative & support | 2012 |
| Saalasti Rails Oy | Manufacturing | 1993 |
| Sami in the air Oy | Arts & recreation | 2000 |
| Satu-Bertta Oy | Manufacturing | 1994 |
| SaumaSeri Ky | Construction | 2016 |
| Solvay Chemicals Finland Oy | Manufacturing | 1970 |
| SteQ Ky | Wholesale & retail | 2008 |
| THK Kuljetus Oy | Transport & logistics | 2013 |
| TRJV Suomi Oy | Education | 2024 |
| Talomyynti V. Immonen Ky | Wholesale & retail | 1985 |
| Tandemi Oy | Health & social care | 2011 |
| TeLa-Tilat Oy | Real estate | 2022 |
| VAP Garage Oy | Manufacturing | 2021 |
| Vauhkonen Talotekniikka Oy | Professional & scientific | 2020 |
| Voikkaan Autohuolto Ky | Other services | 2015 |
| Voikkaan Puutyö Vilén & Hietanen | Manufacturing | 1979 |
| Voikkaan Radanvarren Toimitilat Oy | Real estate | 2014 |
| Voikkaan Vuokrahallit Ky | Other services | 1984 |
| Voikkaan kuntosali Oy | Arts & recreation | 2026 |