| Fix It Garage Oy | Other services | 2024 |
| Forssi Oy | Real estate | 2013 |
| Free Heart Avoin Yhtiö | Arts & recreation | 2020 |
| Fresìlia Oy | Administrative & support | 2025 |
| Fuge Oy | Professional & scientific | 2012 |
| Fumei Oy | Hospitality | 2013 |
| Funit Oy | Wholesale & retail | 2009 |
| Fysiotek Kemi-Tornio Oy | Health & social care | 2010 |
| Gastro Pub Lähelläsi Oy | Hospitality | 2024 |
| Gifts for Wraps Oy | Wholesale & retail | 2019 |
| Gitano Oy | Manufacturing | 1987 |
| Greenstory Oy | Professional & scientific | 2013 |
| H & P Telineasennus Oy | Construction | 2022 |
| HEKT Kauppa Oy | Wholesale & retail | 2023 |
| HSu-Group Oy | Professional & scientific | 2009 |
| HSu-Rakennus Oy | Construction | 2026 |
| HVM Capital Oy | Real estate | 2024 |
| HVM Infra Oy | Construction | 2024 |
| HVM Invest Oy | Financial services | 1988 |
| Hailaiffi Oy | Financial services | 2018 |
| Hakos Trading Oy | Wholesale & retail | 1998 |
| Hammaslaboratorio Lappdent Oy | Health & social care | 1980 |
| Hammaslaboratorio Veli-Matti Heikkilä Oy | Health & social care | 1995 |
| HanNature Oy | Wholesale & retail | 2020 |
| Hankiworks Oy | Professional & scientific | 2015 |
| Hannu M Rantala Ky | Wholesale & retail | 2012 |
| HarWatt Oy | Construction | 2022 |
| Harri Kostamo Oy | Transport & logistics | 2023 |
| Haukkarin Hoseki Oy | Real estate | 2025 |
| Hautauspalvelu Väisänen Oy | Other services | 2011 |
| Hautaustoimisto Veikko Puijola, Kommandiittiyhtiö | Other services | 1974 |
| Heikki Tyystälä Oy | Transport & logistics | 2015 |
| Heimdallr Holding Oy | Professional & scientific | 2020 |
| Heiskanen & Kärki Avoin Yhtiö | Wholesale & retail | 1984 |
| Heiskasen Liikenne Oy | Transport & logistics | 1960 |
| Heiskis Oy | Wholesale & retail | 2020 |
| Hekotus Oy | Wholesale & retail | 2020 |
| Hela LVI-Group Oy | Financial services | 2024 |
| Hepola Films Studio Oy | Arts & recreation | 2023 |
| Hildenin Konepaja Kommandiittiyhtiö | | 1980 |
| Hilipati Oy | Transport & logistics | 2025 |
| Hoitohuone Pitzen Ky | Other services | 2014 |
| Holar Rakennus Oy | Construction | 2018 |
| Hosira Oy | Real estate | 2016 |
| Husky Oy | Manufacturing | 1994 |
| Huusko Enterprise Oy | Education | 2015 |
| Hydro-Kemi HK Oy | Wholesale & retail | 1995 |
| Hydrojone Oy | Manufacturing | 2021 |
| Hyvinvoinnin erikoisosaaja NaMa Oy | Other services | 2021 |
| Hyvinvointiosuuskunta Gerbera | Wholesale & retail | 2014 |
| Hyvän Tuulen Seilit Oy | Arts & recreation | 2017 |
| Häiriösähkö Oy | Construction | 2022 |
| Höpön Talli Oy | Professional & scientific | 2023 |
| Iasa Europe OY | Arts & recreation | 2021 |
| IMSS Ltd Oy Ab - Industrial Mobile Services & Solutions | Information & communication | 2008 |
| Ilmastointi ja rakennuspelti Korjonen Ky | Construction | 1983 |
| Ilves Group Oy | Professional & scientific | 1993 |
| InfraSim Oy | Construction | 2025 |
| Insinööritoimisto ASES Oy | Professional & scientific | 2012 |
| Insinööritoimisto Holappa Oy | Professional & scientific | 2004 |
| Insinööritoimisto TKRK Oy | Professional & scientific | 2007 |
| Insmek Oy | Construction | 2011 |
| Intokiinteistöt Oy | Transport & logistics | 1997 |
| Ipe' s Herkku Oy | Hospitality | 2019 |
| Isännöintipalvelu JP Louste Oy | Real estate | 2009 |
| Isännöintipalvelut Korkiakoski Oy | Real estate | 2013 |
| Isännöitsijätoimisto E Trög Oy | Real estate | 1984 |
| J & J rentals Oy | Real estate | 2024 |
| J&J Invest Bros Oy | Transport & logistics | 2012 |
| J&J Steel Oy | Manufacturing | 2021 |
| J-Point Oy | Manufacturing | 2005 |
| J. Vakkala Oy | Professional & scientific | 2015 |
| J.Laurila Consulting OY | Transport & logistics | 2021 |
| JC Ravintolat Oy | Hospitality | 2017 |
| JKMedi Oy | Health & social care | 2023 |
| JM-Construction Oy | Construction | 2007 |
| JMV Consulting Oy | Professional & scientific | 2021 |
| JN International Natural&Fresh OY | Wholesale & retail | 2026 |
| JP Pulkkinen Oy | Manufacturing | 2015 |
| JR-Ravintolat Oy | Hospitality | 1981 |
| JS Kirjapalvelut Oy | Wholesale & retail | 2016 |
| JT eCommerce Oy | Wholesale & retail | 2024 |
| JVR Music Group OY | Information & communication | 2022 |
| Ja-Ko Rent Oy | Administrative & support | 2012 |
| Jaakko J Aho Ky | Transport & logistics | 2003 |
| Jampek Oy | Manufacturing | 2024 |
| Jarastus Oy | Wholesale & retail | 2022 |
| Jataki Oy | Construction | 2020 |
| Jatan Burger Oy | Hospitality | 2018 |
| Jatuli IO Oy | Information & communication | 2024 |
| Jiao Oy | Hospitality | 2026 |
| Jommi Oy | Financial services | 1992 |
| Joonanmeri Oy | Wholesale & retail | 1995 |
| Jorma Erkinmikko Ky | Water & waste | 1990 |
| Jose Vettainen Oy | Transport & logistics | 2025 |
| Joulupukin juna Oy | Administrative & support | 2022 |
| Jounin Paja Ky | Manufacturing | 1994 |
| Juha Kiiha Ky | Professional & scientific | 1994 |
| Jukan Kukka Ky | Wholesale & retail | 1986 |
| Juomaukko Oy | Wholesale & retail | 2025 |