| Koneurakointi Ruokolainen Ky | Agriculture & fishing | 2011 |
| Korian Kievari Oy | Hospitality | 2018 |
| Korian Kirjapaino Alanko Ky | Manufacturing | 1980 |
| Korian Leipomo Oy | Manufacturing | 1975 |
| Korian Nuohouspalvelu Oy | Administrative & support | 2021 |
| Korian Pitopalvelu Oy | Hospitality | 2017 |
| Korian Puutalot Ky | Construction | 1989 |
| Korian Rakennuspalvelu Oy | Construction | 2020 |
| Korian Wintti Oy | Arts & recreation | 2025 |
| Koskinen & Kump | Wholesale & retail | 1992 |
| Kouvolan Sähkö ja Saneeraus Oy | Construction | 2012 |
| Kuljetus J & M Setälä Avoin yhtiö | Transport & logistics | 2003 |
| Kuljetus J & T Häkälä Oy | Transport & logistics | 2005 |
| Kuljetus JAHOX Oy | Transport & logistics | 2022 |
| Kuljetus Kaukonen Oy | Transport & logistics | 1996 |
| Kuljetus Kuhanen Oy | Transport & logistics | 2024 |
| Kuljetus Sinkkonen Oy | Transport & logistics | 1993 |
| Kuljetus Taiminen Oy | Transport & logistics | 2010 |
| Kuljetus Tomi Alho Ky | Transport & logistics | 2022 |
| Kumikamu oy | Other services | 2026 |
| Kuninkaantien Kuljetus Oy | Transport & logistics | 2025 |
| Kuusaan Kuljetus ja Kuormaus Ky | Administrative & support | 1982 |
| KymStone Oy | Construction | 2019 |
| Kymen Kattotyö Ky | Construction | 1984 |
| Kymen NH - Kiinteistö Oy | Real estate | 1991 |
| Kymen Putkiasennus Oy | Construction | 1988 |
| Kymen TN-Asennus Oy | Manufacturing | 2010 |
| Kymen piha ja kone oy | Other services | 2026 |
| Kymenlaakson Hallipojat Oy | Manufacturing | 1980 |
| Kymppikate Niemi & Vanninen Oy | Construction | 1993 |
| LEKAMA Oy | Education | 2017 |
| LVI- ja Peltityö Töyry Oy | Construction | 2018 |
| Lakiasuon Vesiosuuskunta | Construction | 1992 |
| Larisma Oy | Professional & scientific | 2022 |
| Linna Laatupalvelut Oy | Administrative & support | 2023 |
| LinnaPelto Oy | Administrative & support | 2018 |
| LiveUnit avoin yhtiö | Arts & recreation | 2014 |
| Lääkäripalvelu Lyyra Oy | Health & social care | 2009 |
| M.J.Hallikas Ky | Wholesale & retail | 1998 |
| MDP Lexfennia Oy | Professional & scientific | 1993 |
| MM Yrityspalvelut Oy | Professional & scientific | 2019 |
| MSV Korian Fysio Ky | Health & social care | 2003 |
| MTW Invest Oy | Real estate | 2003 |
| Matin Sakki Oy | Professional & scientific | 2006 |
| Meine Oy | Water & waste | 2022 |
| Mepolar Oy | Wholesale & retail | 2013 |
| Mindglow Oy | Other services | 2022 |
| Mirja Näkki Oy | Professional & scientific | 1996 |
| Muurausliike Seppo Suikkanen Ky | Construction | 1995 |
| Nostrade OY | Wholesale & retail | 2010 |
| Napan Kone Oy | Real estate | 1990 |
| Nappa-Trans Oy | Transport & logistics | 2001 |
| Nelyn avoin yhtiö | Wholesale & retail | 2020 |
| Niina Koli Oy | Professional & scientific | 2019 |
| Niko Rajansalo Oy | Construction | 2019 |
| Nordic MediLink Oy | Professional & scientific | 2023 |
| Northern rhino Oy | Wholesale & retail | 2017 |
| Nosto ja Kuljetus Ruokolainen Oy | Construction | 2011 |
| Nuohous Jukka Parviainen Ky | Administrative & support | 2008 |
| Näkin Kone Ky | Construction | 2017 |
| OTTC Oy | Manufacturing | 2020 |
| Oma LVI-palvelut Oy | Construction | 2020 |
| Otso Aalto Oy | Professional & scientific | 2024 |
| Oy Agrosilva Ltd | Wholesale & retail | 1987 |
| Oy Areka Ltd | Wholesale & retail | 2002 |
| Oy Restotrading Ltd | Hospitality | 1991 |
| P.J Häkkänen Oy | Construction | 2025 |
| PJ-Conseil Oy | Real estate | 1991 |
| PRO Invest Group Oy | Real estate | 2024 |
| PU-Rakennus Oy | Construction | 2010 |
| Palviliha Oy | Manufacturing | 1976 |
| Parturi-kampaamo Anja Koskinen Ky | Other services | 1985 |
| Pauper56 Oy | Real estate | 2023 |
| Pektra Oy | Manufacturing | 1993 |
| Pelrae Oy | Real estate | 1976 |
| Powder Puff Oy | Construction | 2026 |
| Psykoterapiapalvelut Kirsi Saronsalo Oy | Health & social care | 2009 |
| Pukaron Huilipaikka Oy | Hospitality | 1994 |
| R Haimakainen Ky | Wholesale & retail | 1981 |
| RAH-Maalaus Ky | Other services | 2001 |
| Rak Sa Ha Oy | Construction | 2019 |
| Rakennusliike Ekotalot Oy | Real estate | 2011 |
| Rakennuspalvelu Koskiranta Ky | Construction | 2013 |
| Rakennuspalvelu Rantala Oy | Construction | 2013 |
| Rentakk Oy | Real estate | 2021 |
| RhinoX oy | Other services | 2019 |
| Rofedo Oy | Construction | 2018 |
| Rosanor Ky | Wholesale & retail | 2005 |
| Rupu Oy | Professional & scientific | 2023 |
| S. Kahelin Oy | Education | 2017 |
| SFjoys Oy | Transport & logistics | 2025 |
| Santio Group Oy | Professional & scientific | 2025 |
| SiSolutions Oy | Administrative & support | 2021 |
| Skriptum Viestintä Oy | Professional & scientific | 1979 |
| Space Supply Oy | Real estate | 2013 |
| Studio Yogananda Family Oy | Education | 2024 |
| Suomen Musiikkiyhtiö Oy | Arts & recreation | 2012 |
| Sähkötarmo Ky | | 1978 |
| T & J-M Paajanen Oy | Transport & logistics | 2007 |
| Takamaan Kasvu Oy | Health & social care | 2011 |