| Iloinen Viivi Oy | Wholesale & retail | 1985 |
| Ilona-keittiöt Oy | Construction | 2016 |
| InFlow Web Creations Oy | Information & communication | 2019 |
| Influentia Oy | Professional & scientific | 2025 |
| Insighter Group Oy | Professional & scientific | 2025 |
| Insinööritoimisto Hannu Tiitto Ky | Professional & scientific | 2011 |
| Insinööritoimisto Kortelainen Oy | Real estate | 2023 |
| Insuranco Oy | Financial services | 2016 |
| Invest Tiilikainen Oy | Administrative & support | 2021 |
| Isännöinti Jima Oy | Real estate | 2019 |
| J&S-Kiinteistöt Oy | Real estate | 2023 |
| J-E Hämäläinen Oy | Agriculture & fishing | 2010 |
| J.P.AutoTuning Ky | Other services | 2000 |
| JJ Farm Oy | Agriculture & fishing | 2025 |
| JJ Halpa-auto OY | Wholesale & retail | 2022 |
| JMN-Trans Oy | Transport & logistics | 2013 |
| JOKA asennus Oy | Construction | 2017 |
| JPV Expertice Oy | Real estate | 2026 |
| Jaansmo Ay, avoin yhtiö | Hospitality | 2011 |
| Jaarsma Oy | Real estate | 2001 |
| Jani Pekkarinen Oy | Financial services | 2025 |
| Jari Hartikainen Oy | Administrative & support | 2022 |
| Jorma Loppukaarre Oy | Construction | 1994 |
| Jouni Pylkkänen Oy | Construction | 2015 |
| Jovirje Oy | Construction | 2015 |
| Ju-Mi Invest Oy | Real estate | 2015 |
| Junco Oy | Information & communication | 1998 |
| Jälänniemen vesiosuuskunta | Water & waste | 1990 |
| Järvi-Suomen Osuuspankki | Financial services | 1911 |
| Kkk-Kiinteistöt OY | Real estate | 2014 |
| KOS-huolto Oy | Other services | 2026 |
| KOS-palvelu Oy | Administrative & support | 2023 |
| KP-ServicePartner Oy | Manufacturing | 2003 |
| KR Invest Oy | Financial services | 2023 |
| KR Taloustaito Ky | Professional & scientific | 2014 |
| KR-Engineering Oy | Real estate | 2011 |
| KaiKone Oy | Administrative & support | 2026 |
| Kaislava Oy | Financial services | 2017 |
| Kajarve Oy | Construction | 2020 |
| Kallaveden Optiikka Oy | Wholesale & retail | 2018 |
| Kalliolammen Palvelut Oy | Hospitality | 2022 |
| Kaluste Ollikainen Oy | Manufacturing | 2015 |
| Karapoint Oy | Real estate | 2026 |
| Kasu-Kokon vesihuolto-osuuskunta | Water & waste | 2000 |
| Kasurilan Caravankeskus Oy | Wholesale & retail | 1993 |
| Kasurilanmäen Vesihuolto-Osuuskunta | Water & waste | 2000 |
| Kasvu Group Oy | Professional & scientific | 2023 |
| Kasvuntie Oy | Health & social care | 2024 |
| Kauneuskeskus Sari Vallittu Oy | Other services | 2016 |
| KeepTheTunk Oy | Information & communication | 2026 |
| Keskivertoo Parempi Oy | Arts & recreation | 2018 |
| Kiinteistö Oy Aholantie 2 | Real estate | 2016 |
| Kiinteistö Oy Isoharja | Real estate | 2001 |
| Kiinteistö Oy Kuopion Kellopolku 2 | Real estate | 1989 |
| Kiinteistö Oy Markkaset | Real estate | 2004 |
| Kiinteistö Oy Mäntyportti | Real estate | 2003 |
| Kiinteistö Oy Sammontie 10 | Real estate | 2004 |
| Kiinteistö Oy Tissari | Real estate | 1987 |
| Kinahmi-Trans Oy Janne Tirkkonen | Transport & logistics | 1996 |
| Kivelä Holding Oy | Real estate | 2026 |
| Kodinhuoltomies Juha Jormalainen Oy | Construction | 2025 |
| Kohisevankoski Oy | Other services | 2021 |
| KoneNeliö Oy | Construction | 2000 |
| Konepaja Salminen Oy | Manufacturing | 2015 |
| Konerenki Oy | Construction | 1994 |
| Konetyö MAA Oy | Construction | 2020 |
| Koneurakointi Lappeteläinen Oy | Construction | 2022 |
| Koodikupla Oy | Education | 2016 |
| Koti-Siili Oy | Wholesale & retail | 1993 |
| Kotihoito Ilo Oy | Health & social care | 2017 |
| Kukkapuoti 70luvulla Oy | Wholesale & retail | 2025 |
| Kuljetus Kvick Oy | Transport & logistics | 2004 |
| Kuljetus M Kankkunen Oy | Transport & logistics | 1995 |
| Kuljetus Tuovinen Timo ja Sami | Construction | 2004 |
| Kuljetus Ville Lappi Oy | Transport & logistics | 2020 |
| Kuljetusliike Eino Savolainen Oy | Transport & logistics | 1994 |
| Kuljetusliike K.Hietala Ky | Transport & logistics | 1992 |
| Kuljetusliike Kekäläinen Ky | Transport & logistics | 1993 |
| Kuljetusliike Marko Tuomainen Ky | Transport & logistics | 2007 |
| Kuljetusliike T. Rautiainen Oy | Hospitality | 1996 |
| Kumpusen vesihuolto-osuuskunta | Water & waste | 1990 |
| Kuopion Koneurakointi Oy | Construction | 2009 |
| Kuopion Tehosiivous Oy | Professional & scientific | 2018 |
| Kupinniemen Konepaja Kommandiittiyhtiö | Manufacturing | 1982 |
| Körökyyti Oy | Transport & logistics | 1993 |
| LKAB Minerals Oy | Manufacturing | 2004 |
| LR-Kaivu Avoin yhtiö | Construction | 2014 |
| LVI Bolodin Oy | Construction | 2025 |
| LVI-Asennus Kiminki Oy | Construction | 2020 |
| LVI-Palvelut ViVa Oy | Construction | 2021 |
| Lakiapu A. Korhonen Oy | Professional & scientific | 2022 |
| Lakisiili Oy | Professional & scientific | 2006 |
| Langius Oy | Real estate | 1998 |
| Lapra Oy | Construction | 1991 |
| Lasten- ja nuortenkoti Pääskylä Oy | Health & social care | 2008 |
| Lataussiili Oy | Construction | 2022 |
| Leiat Oy | Education | 2001 |
| Leipee Oy | Hospitality | 2024 |
| Liiteri athletics Oy | Arts & recreation | 2021 |
| LiveSports Promotions Oy | Arts & recreation | 2017 |