| MTS multi teknic service Oy | Other services | 2016 |
| Maansiirto Miettinen Oy | Construction | 2016 |
| Madrak Oy | Construction | 2016 |
| Maineprint Oy | Professional & scientific | 2017 |
| Mapiko Oy | Agriculture & fishing | 2021 |
| Marbau Oy | Construction | 2006 |
| Menergy Oy | Construction | 2022 |
| Metallion Oy | Manufacturing | 2007 |
| MiNitar Oy | Hospitality | 2015 |
| Misty Willow Oy | Professional & scientific | 2026 |
| NR-Talo Oy | Construction | 2021 |
| NTIP Sales Oy | Financial services | 2025 |
| Neonwatti Oy | Construction | 2012 |
| Nosturitarkastus TK Oy | Administrative & support | 1986 |
| Olpe Kodit Oy | Construction | 2023 |
| Osuuskunta Tendent | Wholesale & retail | 1979 |
| PIMACO-Trade Ky | Wholesale & retail | 2016 |
| PK-Remontti ja saneeraus Oy | Construction | 2008 |
| Pakkipari Oy | Hospitality | 2020 |
| Paten Paja Oy | Other services | 2008 |
| Pekka Naumanen Oy | Financial services | 2023 |
| Pielaveden Venetmäen kuivuriosuuskunta | Agriculture & fishing | 1990 |
| Pikku Belgia Oy | Hospitality | 2017 |
| Pizza Toivala Avoin Yhtiö | Hospitality | 2021 |
| Porttiharju Oy | Financial services | 2014 |
| Puijon Romu Oy | Wholesale & retail | 1964 |
| RP-Karmi Oy | Construction | 1993 |
| Rakennuspalvelu Ruotsalainen Oy | Construction | 2021 |
| Rakentavat JTP Oy | Construction | 2018 |
| Rakka Sport Office Oy | Professional & scientific | 2025 |
| Rameela Oy | Administrative & support | 2025 |
| Rammy Oy | Manufacturing | 2013 |
| Reagena Oy | Manufacturing | 2012 |
| Rekotec Oy | Professional & scientific | 2020 |
| Rissala Racing Team Oy | Professional & scientific | 2025 |
| Rovea Oy | Real estate | 2025 |
| SP stainless Oy | Manufacturing | 1989 |
| SaloP Oy | Real estate | 2017 |
| Samkone Oy | Wholesale & retail | 2023 |
| Savon Energia Oy | Energy | 1994 |
| Savon Energiaholding Oy | Financial services | 1999 |
| Savon Omakotipalvelu Oy | Wholesale & retail | 2007 |
| Savon Tuplasauma Oy | Construction | 2016 |
| Savon Voima Oyj | Energy | 1947 |
| Savon Voima Verkko Oy | Energy | 2006 |
| Savon tie ja metsä Oy | Real estate | 2021 |
| Savonmuan Diiva Oy | Professional & scientific | 2025 |
| Sawo Records Oy | Information & communication | 2022 |
| SeiMark Oy | Transport & logistics | 2024 |
| Shereign Music Oy | Arts & recreation | 2020 |
| Siilin Saneeraus Oy | Construction | 2010 |
| Sisustustyö Nevalainen Kommandiittiyhtiö | Construction | 1987 |
| Skitrail Oy | Administrative & support | 2018 |
| Suomen Ilmailupalvelut Oy | Education | 2012 |
| Suomen Monesmark Oy | Wholesale & retail | 1997 |
| Sähköasennus Launonen Oy | Construction | 2020 |
| Sähkökonsultti Ojala Oy | Professional & scientific | 2013 |
| Sähköurakointi Lasse Herranen Oy | Construction | 2005 |
| Sähköveke Oy | Professional & scientific | 2006 |
| Säyneenjoen Taimitarha Oy | Administrative & support | 1992 |
| TK Metsäkuljetus Oy | Transport & logistics | 2011 |
| Toion OY | Professional & scientific | 2024 |
| TTT-Tarkastus Oy | Professional & scientific | 2011 |
| Taksi Nokela Oy | Transport & logistics | 2010 |
| Tapio Pitkänen Oy | Real estate | 1986 |
| Terveys ja Toiminta Oy | Health & social care | 2025 |
| The Home of the North Oy | Construction | 2022 |
| Tilvest Oy | Professional & scientific | 2024 |
| ToimivatTassut Oy | Other services | 2024 |
| Toivalan Auto Oy | Other services | 2003 |
| Toivalan Kuljetuspalvelut Oy | Transport & logistics | 2008 |
| Toivalan Liikenneasema Oy | Wholesale & retail | 2014 |
| Toivalan Metalli Oy | Manufacturing | 1978 |
| Toivalan Väri Oy | Other services | 2019 |
| Totec Systems Oy | Information & communication | 2020 |
| Trenton Oy | Construction | 2006 |
| Tukkuliike Projektor Oy | Wholesale & retail | 1990 |
| Tuplajäät Oy | Arts & recreation | 1993 |
| VM Eristyspalvelu Oy | Construction | 2010 |
| VM-CARe Oy | Other services | 2025 |
| Vanhapaikan Tila Oy | Agriculture & fishing | 2022 |
| Venron Oy Ltd | Construction | 1999 |
| Viisikko Capital Oy | Real estate | 2020 |
| Ville sijoitusosakeyhtiö (Visioy) | Real estate | 2025 |
| WellSaid Oy | Health & social care | 2018 |
| Yeeside Oy | Manufacturing | 2017 |
| hasoy Oy | Construction | 2009 |