| A&K Heikura Oy | Wholesale & retail | 1994 |
| A. Tähkänen Oy | Construction | 2000 |
| A.Nevalainen Oy | Transport & logistics | 2020 |
| AATEE Kiinteistöt Oy | Real estate | 2026 |
| AK-Autokorjaamo Pyykkö & Väyrynen avoin yhtiö | Other services | 1990 |
| Acewood Oy | Manufacturing | 1995 |
| Adagio Moving Pictures Oy | Information & communication | 2023 |
| Ahti Kolehmainen Oy | Manufacturing | 1982 |
| Anaika Wood Group Ltd Oy | Manufacturing | 2011 |
| Antero Tanskanen Ky | Wholesale & retail | 2012 |
| Antero Vesa Ky | Wholesale & retail | 2010 |
| Asuste Nuutinen Kommandiittiyhtiö | Wholesale & retail | 1955 |
| Auto-Laine Ky | | 1983 |
| Avarlink Oy | Construction | 1993 |
| Biokrates OY | Education | 2020 |
| Biotravels OY | Arts & recreation | 2020 |
| BeATSafe Oy | Professional & scientific | 2019 |
| Biolife Oy | Other services | 2021 |
| Biozeus Oy | Arts & recreation | 2008 |
| Boutique-Kemikalio Salone Ky | | 1990 |
| Brabaco Oy | Real estate | 1998 |
| Brahean Kiinteistöpalvelut Oy | Construction | 2024 |
| Business Sport Oy | Professional & scientific | 1976 |
| Carelift Nordic Oy | Manufacturing | 2021 |
| Creasoft Oy | Information & communication | 1993 |
| DMACK Lieksa Oy | Real estate | 2025 |
| DMACK Nordic Oy | Manufacturing | 2023 |
| Damshaus Oy | Professional & scientific | 1995 |
| DartFeeder Oy | Professional & scientific | 2026 |
| Dendrite Oy | Health & social care | 2015 |
| Drop Stop Oy | Hospitality | 1990 |
| ESK-yhtiöt Oy | Financial services | 1983 |
| Eijan Kiinteistöt Oy | Real estate | 2016 |
| Ekiman Oy | Transport & logistics | 2007 |
| Eläinlääkäriasema Pielisvet Oy | Professional & scientific | 2021 |
| EräsKokki Oy | Hospitality | 2018 |
| Esa Räty & Tuomo Kärkkäinen | | 1985 |
| Esan Auto- ja Dieselkorjaamo E. Kananen Ky | Other services | 1990 |
| Espires Oy | Financial services | 1986 |
| Eurovan Oy | Wholesale & retail | 1998 |
| Family Publishing Services Oy | Information & communication | 2015 |
| Freetime-Video Ky | Administrative & support | 1987 |
| Fysikaalinen hoitolaitos Fysio-Leena Oy | Health & social care | 1989 |
| GFN Lieksa Oy | Manufacturing | 2016 |
| Genoa Invest Oy Ltd | Construction | 2008 |
| Green Chem Oy | Manufacturing | 2025 |
| H&H Holding Oy | Real estate | 2013 |
| Hammaslääkäri Sari Pyykkö OY | Health & social care | 2021 |
| HAN-Imaco Oy | Construction | 1988 |
| HJMustonen Engineering Oy | Professional & scientific | 2025 |
| HMN Invest Oy | Professional & scientific | 2025 |
| HN-Prosessihitsaus Oy | Manufacturing | 2000 |
| Htmk Holding OY | Financial services | 2021 |
| Hammaslaboratorio Timo Kyllönen Oy | Manufacturing | 2004 |
| Hannu Koskimies Oy | Transport & logistics | 1981 |
| Harkti Oy | Professional & scientific | 2009 |
| Hautaustoimisto Vartiainen Ky | Other services | 1961 |
| Hautaustoimisto ja Kukkakauppa Lahtinen Oy | Other services | 1983 |
| HiaseMummo Oy | Wholesale & retail | 2025 |
| Hius-ja kauneusstudio Bianca Oy | Other services | 2014 |
| HoitoPaja Oy | Health & social care | 2022 |
| Hoitokoti Hopeapaju Oy | Health & social care | 2009 |
| Hullumunkki Oy | Arts & recreation | 2023 |
| Huoltomyynti P. Turunen Ky | Wholesale & retail | 1995 |
| Huoltopaja Veljekset Lehikoinen | Other services | 1982 |
| HyväMieli Asumis- ja Tukipalvelut Oy | Health & social care | 2004 |
| Itä-Suomen Kivinäyte OY | Mining & quarrying | 2020 |
| Ilkka Öystilä Oy | Financial services | 1994 |
| Ilmanvaihtopuhdistus HP-AP Avoin yhtiö | Administrative & support | 2017 |
| Ilonvuoksi Oy | Hospitality | 2021 |
| Innotek Oy | Professional & scientific | 1995 |
| Insinööritoimisto Varpiola Oy | Professional & scientific | 1980 |
| Itä rauta OY | Transport & logistics | 2024 |
| Itä-Suomen Suojakate Oy | Construction | 1980 |
| Itä-Suomen Turvapalvelu Oy | Administrative & support | 1997 |
| J & J avoin yhtiö, Juha Hyttinen ja Jouni Rissanen | Arts & recreation | 1989 |
| JA Kone Oy | Other services | 2022 |
| JATAVA Consulting Oy | Real estate | 2015 |
| JOY-Team Oy | Professional & scientific | 2019 |
| JPT Cargo OY | Transport & logistics | 2011 |
| JaaJuk OY | Other services | 2023 |
| Jamalin Metsä Oy | Agriculture & fishing | 2020 |
| Joella Invest Oy | Real estate | 2007 |
| Jorman Kone Oy | Agriculture & fishing | 1986 |
| Josa-Konerakennus Oy | Professional & scientific | 2004 |
| Jouni Vartiainen Oy | Manufacturing | 2017 |
| Jounin herkku Oy | Hospitality | 2021 |
| Juuan Koneurakointi Oy | Agriculture & fishing | 2018 |
| K.S Rakennustekniikka Oy | Construction | 2017 |
| KOPNEP Invest Oy | Financial services | 1971 |
| KP-Kiinteistöt Oy | Real estate | 2005 |
| KTaA Ky | Administrative & support | 1991 |
| Kaatrakalusto Petri Martikainen Ky | Wholesale & retail | 1979 |
| Kalajaloste Lahtinen Oy | Manufacturing | 1986 |
| Kaplain Oy | Professional & scientific | 2002 |
| Karjalan Kalapojat Oy | Agriculture & fishing | 1999 |
| Karjalan Taitajat Ky | Other services | 1987 |
| KeroSetti Oy | Construction | 2012 |
| Kettunen Forest Oy | Transport & logistics | 1982 |
| Kettunen-yhtiöt OY | Transport & logistics | 2016 |