| Eastnomin Oy | Hospitality | 2024 |
| Easy China Oy | Professional & scientific | 2010 |
| Ecechiria Oy | Professional & scientific | 2015 |
| Eco Decor Oy | Manufacturing | 2018 |
| Eco WWS Oy | Water & waste | 2014 |
| EcoWind-MC Oy | Administrative & support | 2023 |
| Eda Dental Oy | Health & social care | 2020 |
| Ednadel Oy | Professional & scientific | 1995 |
| Edusampo Oy | Education | 2015 |
| Edustusliike Aake Paavola Ky | Wholesale & retail | 1987 |
| Edustusliike Matti Reponen Oy | Wholesale & retail | 1978 |
| Edvard ja Kumppanit Oy | Wholesale & retail | 1997 |
| Eekoo Kiinteistöt Oy | Real estate | 2025 |
| Eeperi Oy | Wholesale & retail | 2010 |
| Efika Invest Oy | Real estate | 2019 |
| Efika Oy | Real estate | 2015 |
| Efsane Avoin Yhtiö | Hospitality | 2013 |
| Efsun Oy | Hospitality | 2022 |
| Ehcotech Oy | Administrative & support | 2020 |
| Eirene Oy | Wholesale & retail | 1982 |
| Ekman Holding Oy | Administrative & support | 2002 |
| Ekra-talo oy | Construction | 2026 |
| Elektrika Solutions Oy | Professional & scientific | 2017 |
| Elokuva Luotola Oy | Information & communication | 2004 |
| Elpida-Min Oy | Health & social care | 2013 |
| Elstor Oy | Manufacturing | 2017 |
| Elvesa Oy | Real estate | 1983 |
| Eläinklinikka Kotisalo Oy | Professional & scientific | 2018 |
| Eläinlääkäripalvelut Katri Kinnunen Oy | Professional & scientific | 2015 |
| EmMiOn Oy | Information & communication | 2024 |
| Emering Oy | Construction | 2003 |
| Emeritus Invest Oy | Financial services | 2026 |
| Emmecon Oy | Information & communication | 2001 |
| Emonum Oy | Information & communication | 2015 |
| Energia Fokus Oy | Construction | 2025 |
| Energia Visio Oy | Energy | 2019 |
| Energiahuolto Oy | Professional & scientific | 1977 |
| Energy Brands Oy | Manufacturing | 2012 |
| Energy Plus Engineering Oy | Professional & scientific | 2021 |
| Enertik Oy | Wholesale & retail | 2000 |
| Engifar Oy | Wholesale & retail | 2021 |
| Engineering Design Häyrynen Oy | Professional & scientific | 1998 |
| Enonkosken Vuokratalot Oy | Real estate | 1984 |
| Enrak Oy | Professional & scientific | 2015 |
| Ensiaputaito Wilderness Medicine Oy | Education | 2026 |
| ErCom Oy | Construction | 2024 |
| Erikoishammaslääkäri Riikka Puustinen Oy | Health & social care | 2005 |
| Erikoishitsaus Aaro Kupari Ky | Manufacturing | 1985 |
| Erikoismoottori Airaksinen Ky | Manufacturing | 2014 |
| Erityis Herkku Avoin yhtiö STB | Manufacturing | 2018 |
| ErmaDi Oy | Construction | 2022 |
| Esa Kallio Oy | Financial services | 2014 |
| Esa Kuukka Ky | Wholesale & retail | 2010 |
| Esanoma Oy | Administrative & support | 2022 |
| Escrita Avoin Yhtiö | Hospitality | 2023 |
| Essin Kahvila Oy | Hospitality | 2018 |
| Etelä-Karjalan Autokoulu Moottori Ky | | 1988 |
| Etelä-Karjalan Kiinteistökehitys Oy | Construction | 2010 |
| Etelä-Karjalan Kiinteistöpalvelut Oy | Other services | 2020 |
| Etelä-Karjalan Mittauskeskus Oy | Professional & scientific | 2007 |
| Etelä-Karjalan Myynti ja Markkinointi Oy | Professional & scientific | 2020 |
| Etelä-Karjalan Osuuskauppa | Wholesale & retail | 1913 |
| Etelä-Karjalan Sairaalaparkki Oy | Real estate | 2010 |
| Etelä-Karjalan Talotekniikka Oy | Construction | 2022 |
| Etelä-Karjalan Tili ja Isännöinti Palvelut Oy | Administrative & support | 2019 |
| Etelä-Karjalan Tili- ja Isännöinti Oy | Professional & scientific | 1981 |
| Etelä-Karjalan Voima Oy | Energy | 1999 |
| Etelä-Karjalan kesäyliopisto Oy | Education | 2020 |
| Etelä-Karjalan raivaussiivous Oy | Administrative & support | 2021 |
| Etelä-Saimaan Radiologipalvelu Oy | Health & social care | 2007 |
| Etelä-Saimaan Sähkötyö Oy | Construction | 1989 |
| Etelä-Savon Siivoustukku Oy | Wholesale & retail | 2000 |
| Etelä-Suomen Kiinteistösijoitusyhtiö Oy | Real estate | 2007 |
| Eumera Accounting Oy | Professional & scientific | 2023 |
| Euro Ceylonia Oy | Hospitality | 2024 |
| Euro-huvilat Oy | Hospitality | 1990 |
| EuroNord Service Oy | Other services | 2020 |
| Euroglobus Oy | Wholesale & retail | 2019 |
| Eurohuolinta Oy | Transport & logistics | 1991 |
| Eurokronstadt Oy | Manufacturing | 1993 |
| European Foods Oy | Wholesale & retail | 2020 |
| Eurosite Oy | Real estate | 1995 |
| Evert Oy Suomi | Arts & recreation | 2013 |
| Exendor Oy | Information & communication | 2026 |
| Exima Consulting Oy | Professional & scientific | 1997 |
| Exsitec Oy | Information & communication | 2025 |
| Eye On Expertise Oy | Health & social care | 2016 |
| F&K Group OY | Manufacturing | 2022 |
| Fatim OY | Hospitality | 2025 |
| FIILIS Unlimited Oy | Professional & scientific | 2025 |
| Fincomset OY | Agriculture & fishing | 2023 |
| FM Cemal Oy | Hospitality | 2026 |
| FM Pico Oy | Hospitality | 2025 |
| FR Consulting Oy | Professional & scientific | 2002 |
| FT Holding Oy | Professional & scientific | 2021 |
| Fabrikhill Music Oy | Arts & recreation | 2025 |
| FastReactInventors Oy | Information & communication | 2021 |
| Feelmax Oy | Wholesale & retail | 2011 |
| Fegato Oy | Administrative & support | 2008 |
| Fellows Invest Oy | Real estate | 2021 |