| AT-Osa Oy | Wholesale & retail | 2006 |
| Alsober Oy | Real estate | 2019 |
| Anni Lahti Oy | Professional & scientific | 1975 |
| Asennuspalvelu Nikka Ky | Manufacturing | 2016 |
| Auto- ja Konekorjaamo Hakkarainen Oy | Other services | 2022 |
| Auto- ja konekorjaamo Risto Hakkarainen Ky | Other services | 2001 |
| Bomila Resort Oy | Hospitality | 2022 |
| Darafam Oy | Information & communication | 1995 |
| Eri-Systems Oy | Manufacturing | 1994 |
| Famifarm Oy | Agriculture & fishing | 1985 |
| Famigro Oy | Professional & scientific | 1976 |
| Famitech Oy | Professional & scientific | 1969 |
| Fincons Oy | Professional & scientific | 2003 |
| Finnuit Design Oy | Wholesale & retail | 2021 |
| Finnurmi Oy | Wholesale & retail | 1993 |
| Full House Service Oy | Other services | 2021 |
| Golf Manor Oy | Financial services | 1994 |
| Golf-Savo Oy | Wholesale & retail | 2006 |
| H & K Kuronen Ky | Transport & logistics | 1986 |
| HaKo Forest Oy | Agriculture & fishing | 1995 |
| Hovipelto Oy | Agriculture & fishing | 1989 |
| IQW Engineering Oy | Professional & scientific | 2025 |
| Ikuinen Kalevala Ky | Wholesale & retail | 1989 |
| Instruo Oy | Professional & scientific | 2013 |
| J. Turunen Power Consulting Oy | Professional & scientific | 2012 |
| JK Heat Control Ky | Manufacturing | 2002 |
| JKA CONSULTS Ky | Professional & scientific | 2006 |
| JoWa Aviation Oy | Transport & logistics | 2023 |
| Jormet Oy | Manufacturing | 1981 |
| Joro-Forest Oy | Agriculture & fishing | 2022 |
| Joroisniemen valokuituosuuskunta | Information & communication | 2020 |
| Joroisten Autokorjaamo Oy | Wholesale & retail | 1997 |
| Joroisten Etappi Oy | Wholesale & retail | 1990 |
| Joroisten Fysioterapia Oy | Health & social care | 1985 |
| Joroisten Höyläämö Ky | Wholesale & retail | 1994 |
| Joroisten Kartano-Golf Oy | Arts & recreation | 1988 |
| Joroisten Koneurakointi Oy | Construction | 2017 |
| Joroisten Leipomo Oy | Manufacturing | 1978 |
| Joroisten Oma osuuskunta | Financial services | 1919 |
| Joroisten Vuokrakiinteistöt Oy | Real estate | 2025 |
| Joroisten Wanha Selli Oy | Real estate | 2021 |
| Joronjälki Oy | Hospitality | 1998 |
| Josaka Oy | Manufacturing | 2020 |
| Jot Works Oy | Manufacturing | 2001 |
| Juhanala Oy | Real estate | 1996 |
| Järvikylä Gods Aktiebolag | Agriculture & fishing | 1986 |
| KS Linework Oy | Water & waste | 2019 |
| Kvj-Forest OY | Agriculture & fishing | 2022 |
| KaJaSa Kiinteistösijoitus Oy | Real estate | 2026 |
| Karppola Ky | Manufacturing | 1990 |
| Keski-Savon T-maatalous Ky | Wholesale & retail | 1989 |
| Kiint. Oy Joroisten Sähkökulma | Real estate | 1997 |
| Kiinteistö Oy Honkaura | Real estate | 1976 |
| Kiinteistö Oy Joroisten Pariisi | Real estate | 2011 |
| Kiinteistö Oy Joroisten Viertorinne | Real estate | 1996 |
| Kiinteistö Oy Ryyhtölän Hirvimaja | Real estate | 2009 |
| Kiinteistöyhtymä A & A Kärkkäinen Avoin yhtiö | Real estate | 2008 |
| Kirjapaino Joroprint Ky | Manufacturing | 1991 |
| Kivi-Jussi Oy | Construction | 2000 |
| Kolman infraosuuskunta | Water & waste | 1987 |
| Koneurakointi JP Damski Ky | Agriculture & fishing | 2022 |
| Korsteeni Oy | Administrative & support | 2020 |
| Kruunu Herkku Holding Oy | Financial services | 2025 |
| Kuljetus H.Hakala Oy | Transport & logistics | 2016 |
| Kuljetus Jari Hentunen Ky | Transport & logistics | 1990 |
| Kuljetus Jouha Oy | Transport & logistics | 2002 |
| Kuljetus Jukka Silmäri Oy | Transport & logistics | 1998 |
| Kuljetus ja Hinaus Riekkinen Oy | Transport & logistics | 2019 |
| Kuljetus ja konetyö Damski Ky | Transport & logistics | 2019 |
| Lakitoimisto Laki & Oikeus Ky | Professional & scientific | 2005 |
| Leka Suomi Oy | Administrative & support | 1998 |
| LettuLeidit Oy | Hospitality | 2017 |
| Maalausliike a Toivanen Kommandiittiyhtiö | Construction | 1987 |
| MJM-automaatio ky | Construction | 2012 |
| Maanrakennus Viljakainen Oy | Construction | 2007 |
| Mattoautot oy | Wholesale & retail | 2019 |
| MediKivi Oy | Wholesale & retail | 2025 |
| Miinan Torikahvio Oy | Hospitality | 2011 |
| OC-System Oy | Manufacturing | 1992 |
| Ojm Invest OY | Hospitality | 2007 |
| Omaniemen Koneurakointi Oy | Construction | 2022 |
| Omaranta Oy | Hospitality | 1978 |
| Osuuskunta Joroisten lukion Eihvel | Professional & scientific | 2015 |
| Oy U-Cont Ltd | Manufacturing | 1988 |
| PDB Louhinta Ky | Construction | 1989 |
| Parturi-Kampaamo A Suhonen Oy | Other services | 2024 |
| Pekka Saastamoinen Oy | Real estate | 1980 |
| Pizzeria Joroinen Ky | Hospitality | 2009 |
| Power Steel Oy | Manufacturing | 2006 |
| Pro Linen Ky | Manufacturing | 2017 |
| Puusepänliike Ihalainen Avoin yhtiö | Manufacturing | 1975 |
| Pyörähuolto Peräsalmi Oy | Wholesale & retail | 2026 |
| Rakennusinsinööritoimisto Sampo Linnaranta Oy | Professional & scientific | 2021 |
| Rakennusliike Hannu Lahtinen Oy | Construction | 2024 |
| SK-Laitoshuolto Oy | Manufacturing | 2011 |
| SLT Asennus Oy | Construction | 2024 |
| Saarelainen Family Oy | Wholesale & retail | 2022 |
| Savon Nostokuljetus Oy | Transport & logistics | 2008 |
| Savon Pesulapalvelut Oy | Real estate | 2017 |
| Semenat Oy | Agriculture & fishing | 1995 |