| Emotio Oy | Health & social care | 2023 |
| EndoMix Oy | Health & social care | 2008 |
| Energineering Oy | Information & communication | 2004 |
| Energinvest Oy | Real estate | 2022 |
| Enerless Oy | Professional & scientific | 2023 |
| English Old Sports Car Shop Oy | Real estate | 1989 |
| Entefa Oy | Other services | 2025 |
| Enter Advice Oy | Real estate | 2014 |
| Ep:n Rakennustyö Oy | Construction | 1997 |
| Epec Oy | Manufacturing | 1999 |
| Eper Eristys Oy | Construction | 1983 |
| Eriansio Oy | Financial services | 2025 |
| Erikoislääkäripalvelu Botnia Oy | Health & social care | 2014 |
| Ertela Oy | Manufacturing | 1992 |
| Eräkellari Oy | Wholesale & retail | 1991 |
| Eränurkka Ky | Wholesale & retail | 2004 |
| Esaka Oy | Hospitality | 2018 |
| Esan Paja Oy | Manufacturing | 1978 |
| Eseno Oy | Financial services | 2023 |
| Estalko Oy | Wholesale & retail | 2022 |
| Estanc Finland Oy | Manufacturing | 2011 |
| Etelä-Lakeuden Asunnot Oy | Real estate | 2017 |
| Etelä-Lakeuden Kiinteistöt Oy | Real estate | 2017 |
| Etelä-Pohjanmaan Autopesu Oy | Other services | 2017 |
| Etelä-Pohjanmaan Keskusoptiikka Oy | Wholesale & retail | 1991 |
| Etelä-Pohjanmaan Kolariosat Oy | Wholesale & retail | 1989 |
| Etelä-Pohjanmaan Musiikkiopiston Kannatusosakeyhtiö | Education | 1938 |
| Etelä-Pohjanmaan Osuuskauppa | Wholesale & retail | 1984 |
| Etelä-Pohjanmaan Osuuspankki | Financial services | 1992 |
| Etelä-Pohjanmaan Pytinki Oy | Administrative & support | 1995 |
| Etelä-Pohjanmaan Ratsastuskeskus Oy | Arts & recreation | 1989 |
| Etelä-Pohjanmaan Ravikatsomo Oy | Real estate | 1973 |
| Etelä-Pohjanmaan Spesialistit Oy | Health & social care | 1989 |
| Etelä-Pohjanmaan Tieliikenne Oy | Transport & logistics | 1995 |
| Etelä-Pohjanmaan Turve Oy | Mining & quarrying | 1981 |
| Etelä-Pohjanmaan eläinklinikka oy | Professional & scientific | 2025 |
| Etelä-Suomen monialaosaajat Oy | Construction | 1995 |
| Etlas Oy | Professional & scientific | 2008 |
| Eurasian Business Solutions Oy | Wholesale & retail | 2018 |
| Euro Mechanics Oy | Manufacturing | 2011 |
| Eurobox Finland Oy | Wholesale & retail | 2020 |
| Eurocar TT Oy | Wholesale & retail | 2009 |
| Euroviihde Oy | Professional & scientific | 1990 |
| Eurowalo Oy | Wholesale & retail | 1986 |
| Evibet Oy | Manufacturing | 1984 |
| Exercising Mindfulness Oy | Education | 2025 |
| Exertus Oy | Information & communication | 2003 |
| Exisens Oy | Information & communication | 2009 |
| ExpeditionX Oy | Professional & scientific | 2024 |
| Exxert Oy | Real estate | 2017 |
| FARIDA Avoin yhtiö | Hospitality | 2013 |
| Fc-Service OY | Real estate | 2008 |
| FG Palvelu Oy | Transport & logistics | 2023 |
| Finn Building and Wood OY | Construction | 2014 |
| Finrecords OY | Information & communication | 2016 |
| FKC-Yhtiöt Oy | Real estate | 2020 |
| FMS-Service Oy | Wholesale & retail | 2008 |
| FR Kauppakonserni Oy | Wholesale & retail | 2020 |
| Fabriili Oy | Financial services | 2020 |
| Fana Immonen Oy | Professional & scientific | 2024 |
| Fangda Oy | Hospitality | 1993 |
| Fano Oy | Professional & scientific | 2019 |
| Feebe Oy | Wholesale & retail | 2023 |
| Feldcape Oy | Wholesale & retail | 2020 |
| Feneca Ky | Administrative & support | 1996 |
| Ferrain Investment Oy | Wholesale & retail | 2017 |
| Fest Food Oy | Hospitality | 2009 |
| Festelan Oy | Manufacturing | 2017 |
| Fidentia Partners Oy | Professional & scientific | 2026 |
| Fieteri Oy | Health & social care | 2009 |
| Fiinia Oy | Manufacturing | 2008 |
| Fiksaatio Oy | Arts & recreation | 2018 |
| Fillarikauppa Cycli Oy | Wholesale & retail | 2015 |
| Fillarikauppa Cycli Vaasa Oy | Wholesale & retail | 2019 |
| FinNero Oy Ltd | Wholesale & retail | 2016 |
| Finance Crew Finland Oy | Information & communication | 2026 |
| Finlands Psyko-System Consulting Oy | Health & social care | 1995 |
| Finn-Power Oy | Manufacturing | 2000 |
| FinnAccount Oy Ltd | Real estate | 1992 |
| FinnAlpha Estates Oy | Real estate | 2026 |
| Finncora Oy | Construction | 1999 |
| Finncut barbershop Oy | Other services | 2026 |
| Finnjousi Kommandiittiyhtiö | | 1980 |
| Finnlacto Oy | Wholesale & retail | 2014 |
| Finno Health Oy | Manufacturing | 2024 |
| Finnpig Oy | Agriculture & fishing | 2002 |
| Finnsat Oy | Wholesale & retail | 2017 |
| Finpeka Ky | Professional & scientific | 2011 |
| Finspection Consulting Oy | Professional & scientific | 2021 |
| Finspection Oy | Professional & scientific | 2022 |
| Finvibes Consulting Oy | Professional & scientific | 2025 |
| Fisyr Kiinteistökehitys Oy | Construction | 2010 |
| Fisyr Oy | Financial services | 2008 |
| Fisyr Vuokra-asunnot Oy | Financial services | 2019 |
| Fit Capital Oy | Administrative & support | 2023 |
| Fit Salo Oy | Arts & recreation | 2022 |
| Fit Sjk Oy | Arts & recreation | 2017 |
| Fitner Oy | Information & communication | 2010 |
| Fixautohuolto Seinäjoki Oy | Other services | 2022 |
| Flam Out Oy | Professional & scientific | 2014 |