| Laudito Oy | Health & social care | 2009 |
| Lauronen Myyntivalmennus Oy | Professional & scientific | 2025 |
| Liperin poimintakoneosuuskunta | Agriculture & fishing | 2001 |
| Lumokude Oy | Wholesale & retail | 2025 |
| M.J. Hirvonen Ky | Transport & logistics | 1995 |
| Marketeye OY | Professional & scientific | 2015 |
| MJM Solutions Oy | Professional & scientific | 2008 |
| MP-Urakointi Ky | Agriculture & fishing | 1999 |
| MTM-Markkinointi Ky | Wholesale & retail | 1996 |
| Maanrakennusliike Maaverkko Oy | Construction | 2011 |
| Maansiirto E. Huttunen Oy | Construction | 2022 |
| Maaverkko Kiinteistöt Oy | Real estate | 2015 |
| Matti Sallinen Ky | Wholesale & retail | 1973 |
| Matti T. Määttä Oy | Construction | 2018 |
| Metals One Finland Oy | Mining & quarrying | 2010 |
| Metsämarket Oy | Wholesale & retail | 2008 |
| Metsätoimisto Tuomiaho Oy | Agriculture & fishing | 2009 |
| Mine Manor Oy | Real estate | 2024 |
| Mittarihuolto Pauli Järvenpää Ky | | 1981 |
| Mondo Minerals Nickel Oy | Manufacturing | 2012 |
| Moniala Veijarit Oy | Transport & logistics | 2021 |
| Monipalvelu Mutanen Ky | Construction | 1999 |
| Mossea Group oy | Information & communication | 2018 |
| Mossea Ky | Other services | 2016 |
| Mossea Raskashuolto Oy | Other services | 2020 |
| Mossea Systems Oy | Wholesale & retail | 2025 |
| Mountain Sheep Oy | Information & communication | 2006 |
| Muuraja Ky | Professional & scientific | 1983 |
| Muurajan Auto Oy | Other services | 2015 |
| Muuralan Sijoitus Oy | Financial services | 1986 |
| Nature Line Cutlery Oy | Manufacturing | 2020 |
| Neswin Oy | Financial services | 1992 |
| New-Steel Oy | Manufacturing | 1989 |
| Nittha Oy | Hospitality | 2022 |
| OONA Kaija Räsänen Ky | Manufacturing | 2001 |
| Oku Gravitas Oy | Administrative & support | 2025 |
| OkuWood Oy | Manufacturing | 2019 |
| Okun Autolähetti Oy | Transport & logistics | 2001 |
| Okun Energia Oy | Energy | 2020 |
| Okun Hammaspyörä Oy | Manufacturing | 1978 |
| Okun Huoltokellari Ky | Other services | 1983 |
| Okun Koneistuspalvelu Oy | Manufacturing | 1979 |
| Okun Koneosa Oy | Wholesale & retail | 1998 |
| Okun Monialapalvelu Oy | Construction | 2024 |
| Okun Putkityö Oy | Construction | 1979 |
| Okun Sälekaihdin Oy | Manufacturing | 1977 |
| Okun Taksit Oy | Transport & logistics | 2006 |
| Okun Terähuolto Ky | Manufacturing | 1980 |
| Okun Vuokraus Oy | Administrative & support | 2023 |
| Onta Oy | Professional & scientific | 2011 |
| Osen kiinteistöt Oy | Administrative & support | 2024 |
| Osuuskunta Työsinetti | Administrative & support | 1997 |
| Outokummun Energia Oy | Energy | 1999 |
| Outokummun Helppo Nakki Ky | Hospitality | 1993 |
| Outokummun Kiviteollisuus Ky | Manufacturing | 1993 |
| Outokummun Kukka ja Hautauspalvelu Oy | Other services | 2018 |
| Outokummun Liikenneopetus Oy | Education | 1969 |
| Outokummun Loka ja Pesu Palvelu Oy | Water & waste | 2019 |
| Outokummun Lukko Viitaniemi Ky | Transport & logistics | 1991 |
| Outokummun Metalli Oy | Manufacturing | 1980 |
| Outokummun Optiikka Oy | Wholesale & retail | 1975 |
| Outokummun Pienkone Oy | Wholesale & retail | 2022 |
| Outokummun Vaihtoehto Oy | Real estate | 1997 |
| Outokummun Varaosa Oy | Wholesale & retail | 1984 |
| Outokummun seudun teollisuuskylä Oy | Real estate | 1979 |
| Outoplan Oy | Professional & scientific | 1985 |
| P-K:n sairasteurastus ja -leikkaus Tapio Hummelholm Oy | Manufacturing | 1993 |
| PK:n Pelti ja Ilmastointi Ky | Construction | 1992 |
| Pahnionhovi Oy | Wholesale & retail | 2024 |
| Palorannan Hoitokoti Oy | Real estate | 2007 |
| ParVita Consulting Oy | Professional & scientific | 2021 |
| Pekka Kastikainen Ky | | 1982 |
| Pelti ja Ilmastointi Tiilikainen Oy | Construction | 2024 |
| Peltiyhtymä Korkiakoski & Teppo | Construction | 1980 |
| Perhekoti Taipale Oy | Health & social care | 2014 |
| Piippo Oyj | Manufacturing | 1979 |
| Pohjois-Karjalan Kumikorjaamo Oy | Wholesale & retail | 2023 |
| Premetec Oy | Manufacturing | 2015 |
| Premetec Production Oy | Manufacturing | 1986 |
| Promertek Oy | Professional & scientific | 2013 |
| Putkieristysliike Juha Kontkanen Ky | Construction | 1994 |
| Puunkorjuu Malinen Oy | Agriculture & fishing | 2023 |
| R-Leader Sulkies Ky | Manufacturing | 2012 |
| RaisaTuuli Oy | Hospitality | 2011 |
| Rakennus Tuononen Oy | Construction | 2022 |
| Rakennuskonsultointi T Kekki Oy | Professional & scientific | 2019 |
| ReeTase Oy | Professional & scientific | 2024 |
| SE-Care Oy | Education | 2024 |
| Sun Soft Works Ky | Information & communication | 2008 |
| Santrade Oy | Wholesale & retail | 2014 |
| Saramolahti Kommandiittiyhtiö | Manufacturing | 1982 |
| Seppo Halttunen Ky | | 1987 |
| Siltasaaren Kukka- ja Hautauspalvelu Ky | Other services | 1990 |
| Soapstone Bidco Oy | Professional & scientific | 2020 |
| Suomen Klassikkokustannus Oy | Professional & scientific | 2001 |
| SähköSinetti Oy | Construction | 2014 |
| Sähkösuunnittelu Juha Eskelinen Oy | Professional & scientific | 2012 |
| TALOTIIKERI Oy | Real estate | 2007 |
| TEMM Oy | Professional & scientific | 1993 |
| TRK Huoltopalvelu OY | Construction | 2024 |