| 1st Dime Oy | Financial services | 2014 |
| Anun Lahja- ja Kukkatupa Ky | Other services | 2005 |
| Asennus ja Rakennus Räsänen Ky | Construction | 2015 |
| Eikala Oy | Wholesale & retail | 1992 |
| Elcostblano Ky | Construction | 1990 |
| Feelwood Oy | Manufacturing | 2012 |
| Good-Invest Ky | Real estate | 1975 |
| Hybrid cars M & Co. OY | Wholesale & retail | 2018 |
| Itä-Scanner Oy | Health & social care | 1991 |
| J. Aaristo Oy | Information & communication | 1993 |
| JAJ Purmonen Oy | Financial services | 2015 |
| JH Kalkinlevitys Oy | Agriculture & fishing | 2023 |
| JW-Forklift Oy | Manufacturing | 2015 |
| Jema Street Food Oy | Hospitality | 2024 |
| Karelia Firma Service KFS Oy | Professional & scientific | 1995 |
| Kestohitsaus Oy | Wholesale & retail | 2012 |
| Kierturi Oy | Manufacturing | 2026 |
| Kiinteistö Oy Tuusniemen Kyläkauppa | Real estate | 2006 |
| Kiinteistö Oy Tuusniemen Turula | Real estate | 1995 |
| Kokki Concept Oy | Hospitality | 2012 |
| Kolmostuotanto Oy | Professional & scientific | 2007 |
| Konehuolto Hirvonen Oy | Manufacturing | 2010 |
| KotiPortti - HomeGate Oy | Real estate | 2023 |
| Kuljetus Lindholm Ky | Transport & logistics | 2008 |
| Kuljetusliike Tervo & Co. Oy | Transport & logistics | 1993 |
| Kuutostuote Oy | Information & communication | 2006 |
| LasseArmas Oy | Construction | 2021 |
| Leimasinpalvelu Cu-Pari Oy | Wholesale & retail | 1997 |
| Louhintaliike V. Savolainen Oy | Construction | 1999 |
| Maansiirtoliike Arvo Tirkkonen Kommandiittiyhtiö | Construction | 1984 |
| Masapo Ky | Wholesale & retail | 2017 |
| MedStar Oy | Health & social care | 2008 |
| Peltonen Infra Oy | Construction | 2025 |
| Persanus Oy | Health & social care | 1983 |
| PilviPojat Oy | Real estate | 2021 |
| Polarmega Oy | Wholesale & retail | 2008 |
| Pro Coating Finland Oy | Other services | 2020 |
| Päivi Voutilainen Oy | Wholesale & retail | 2024 |
| RKM Miettinen Oy | Professional & scientific | 2022 |
| Rantalan Muatila Oy | Education | 2014 |
| Rinkkitupa Avoin yhtiö | Hospitality | 2011 |
| Ruoska Työnjohtopalvelut Oy | Professional & scientific | 2019 |
| Savetar Ky | Manufacturing | 1997 |
| Savo-Karjalan Kassatalo Oy | Professional & scientific | 2006 |
| Savo-Karjalan Laskenta osk. | Professional & scientific | 2002 |
| Sawon Novas Oy | Wholesale & retail | 2009 |
| Speed Motorsport Oy | Arts & recreation | 2009 |
| Sähkö Kylmä Lämpö Oy | Construction | 2023 |
| TM-Volt Oy | Real estate | 2000 |
| Taksi Savo Ky | Transport & logistics | 2019 |
| Tukihu Oy | Administrative & support | 2014 |
| Tuus-Vene Ky Reijo Riekkinen | Manufacturing | 1980 |
| Tuusniemen Aluelämpö Oy | Energy | 1997 |
| Tuusniemen Autohuolto ja Varaosa Oy | Other services | 2009 |
| Tuusniemen Fysio Ky | Health & social care | 2019 |
| Tuusniemen Lämpö ja Vesi Oy | Construction | 1998 |
| Tuusniemen Metsäharvennus avoin yhtiö | Agriculture & fishing | 2007 |
| Tuusniemen Raivaus avoin yhtiö | | 1982 |
| Tuusniemen Sairaankuljetus Oy | Health & social care | 1994 |
| Tuusniemen Sora Oy | Mining & quarrying | 1988 |
| Tuusniemen Teollisuus Oy | Financial services | 1991 |
| Tuusniemen Tilitoimisto Ky | Professional & scientific | 2008 |
| Tuusniemen vesiosuuskunta | Water & waste | 1990 |
| Tuustech Oy | Wholesale & retail | 2021 |
| Tuusvesi Oy | Transport & logistics | 2009 |
| Viihdekeskus Hojo Hojo Oy | Hospitality | 1995 |
| Wuohiniemi Oy | Professional & scientific | 2022 |
| ks22 savo oy | Manufacturing | 2022 |