| Highland Levi Chalets Oy | Real estate | 2025 |
| Hirsi-Puu Oy | Construction | 2026 |
| Hirttiö Adosel Oy | Hospitality | 2022 |
| Hirttiö Invest Oy | Professional & scientific | 2026 |
| Honkaharju Invest ky | Financial services | 1976 |
| Honkaharjun Puutarha Oy | Agriculture & fishing | 2002 |
| Hopeamarkka Invest Oy | Financial services | 2001 |
| Human Academy Oy | Professional & scientific | 2026 |
| Huoltamo Saarenpudas Oy | Wholesale & retail | 2003 |
| Hutcode Oy | Information & communication | 2022 |
| Hyvän Alun Kodit Oy | Real estate | 2023 |
| Hämäläinen Group Oy | Professional & scientific | 2019 |
| IDEAHJO Oy | Professional & scientific | 2024 |
| Iistop OY | Real estate | 2018 |
| IK-Konsultointi Ky Ilkka Köngäs | Professional & scientific | 1991 |
| IV-Haka Oy | Construction | 2017 |
| Ilmaster Oy | Construction | 2007 |
| Importxx Oy | Wholesale & retail | 2021 |
| Inarin Matkailu ja Markkinointi Oy | Administrative & support | 2019 |
| Inrinne Oy | Construction | 2023 |
| Insinööritoimisto Peritek Oy | Professional & scientific | 2017 |
| Insinööritoimisto Tutko Oy | Professional & scientific | 2017 |
| Invisible Forest Lodge Oy | Hospitality | 2025 |
| Ismo Mursu Oy | Hospitality | 2019 |
| Isännöintipalvelu JES Oy | Real estate | 1996 |
| J & T Inspiration Ky | Education | 2007 |
| J Niva Oy | Construction | 1992 |
| J&K Broker House Kommandiittiyhtiö | Financial services | 2005 |
| J. Kuittinen Oy | Construction | 2019 |
| J.J power group oy | Transport & logistics | 2020 |
| Javete OY | Hospitality | 2006 |
| JF Maalaus Ky | Construction | 1986 |
| JJ-Mood Oy | Professional & scientific | 2020 |
| JJM Capital Oy | Professional & scientific | 2024 |
| JOS Invest Oy | Professional & scientific | 2024 |
| JP-Asunnot Oy | Financial services | 2009 |
| JSK-Sport Ky | Wholesale & retail | 1993 |
| JTK metalli Oy | Construction | 2023 |
| JVP-Capital Oy | Wholesale & retail | 1972 |
| JVP-Partners Oy | Real estate | 1989 |
| JY-Rakennus Oy | Financial services | 1998 |
| Janican Pirssi avoin yhtiö | Transport & logistics | 2019 |
| Janju Ky | Other services | 2021 |
| Jarkat Ky | Administrative & support | 2008 |
| Javision Oy | Health & social care | 2019 |
| Jen's Properties Oy | Hospitality | 2026 |
| Jokisara Oy | Education | 2023 |
| Joonatan Consulting Oy | Professional & scientific | 2008 |
| Jorma Nerg Ky | Administrative & support | 2017 |
| JossuLiikuttaa Oy | Education | 2022 |
| Juha Tahvanainen Oy | Real estate | 1992 |
| Jukka Vornanen Oy | Wholesale & retail | 1971 |
| Jumacon Oy | Professional & scientific | 1985 |
| Jureal Oy | Real estate | 2024 |
| Jussin Auto- ja konehuolto Oy | Other services | 2023 |
| K. M. Hast Oy | Transport & logistics | 1996 |
| KKdoc Oy | Health & social care | 2007 |
| KOy KatTan | Real estate | 1998 |
| KSHM Thallus Oy | Hospitality | 1997 |
| Kaatunut Kasi Oy | Administrative & support | 2014 |
| Kahdeksas Ihme Oy | Education | 2023 |
| Kaivinkonepalvelu Saarenpudas Oy | Construction | 2010 |
| Kala ja Liha Pentti Hietaniemi Oy | Hospitality | 2013 |
| Kaltio Media Oy | Professional & scientific | 2026 |
| Kaltor Oy | Construction | 2025 |
| Kaluste Kortesalmi Oy | Manufacturing | 2022 |
| Kari Mettiäinen Oy | Real estate | 1990 |
| Kasa-Investointi Oy | Financial services | 2016 |
| Kautto & Saukko Oy | Hospitality | 2012 |
| Keittiökaluste Sanna Ky | Manufacturing | 1990 |
| Kelo Capital Oy | Real estate | 2025 |
| Keskikoski Group Oy | Real estate | 2021 |
| Keskisuutarin Perhekoti Oy | Health & social care | 2005 |
| Kiinteistö Oy Aittatie 11-13 | Real estate | 1983 |
| Kiinteistö Oy Kerotupa | Real estate | 1987 |
| Kiinteistö Oy Kuontila | Real estate | 1990 |
| Kiinteistö Oy Mokoma | Real estate | 2014 |
| Kiinteistö Oy Ounasjoentie 69 | Real estate | 1975 |
| Kiinteistö Oy Roi mlk Napapiirintie 16 | Real estate | 1996 |
| Kiinteistö Sarvipirtti Oy | Real estate | 1989 |
| Kiinteistö-Ollila Oy | Real estate | 2007 |
| Kiinteistöpalvelu Kajulat Oy | Administrative & support | 1985 |
| Kimuri Music World Oy | Arts & recreation | 1993 |
| Kinos Design Oy | Manufacturing | 2018 |
| Kirjanpitopalvelut Repola Oy | Professional & scientific | 2025 |
| Kittilän Alueverkko Oy | Energy | 2001 |
| Kivirakka Capital Oy | Professional & scientific | 2026 |
| Koillis-Suomen Puu ky | Wholesale & retail | 1983 |
| Kolmen sillan taika Oy | Real estate | 2024 |
| Kone-Sarajärvi Oy | Construction | 2013 |
| Koneyhtymä Mustonen Oy | Construction | 2017 |
| Koru- ja Taidekäsityö A. Kangasniemi Ky | Manufacturing | 1995 |
| Kosmik Oy | Financial services | 2025 |
| Kotikolon Kotipalvelut Oy | Health & social care | 2018 |
| Koulutus- ja terapiapalvelut Irma Tuisku Oy | Health & social care | 2007 |
| Kriterion Solutions Oy | Information & communication | 2022 |
| Krobber Ky | Administrative & support | 1997 |
| Kuljetus J. Koskela Oy | Transport & logistics | 1996 |
| Kuljetus Martti Hyvönen Oy | Transport & logistics | 1998 |
| Kuljetus Nivateam Oy | Transport & logistics | 2008 |