| Donewise Oy | Other services | 2023 |
| Donna B Oy | Wholesale & retail | 2010 |
| Doroff Oy | Wholesale & retail | 2016 |
| Dr Baumann kosmetiikka Finland Oy | Wholesale & retail | 1987 |
| Dressy Oy | Wholesale & retail | 2000 |
| Dribla Oy | Wholesale & retail | 2023 |
| Dropshot Corporation Oy | Financial services | 2026 |
| Duman Ravintola Oy | Hospitality | 2023 |
| E-Major Oy | Information & communication | 2003 |
| E. Valjakka Oy | Professional & scientific | 2009 |
| EA Protech Oy | Manufacturing | 2011 |
| Eal-Palvelut OY | Construction | 2007 |
| ECO10 Group Finland Oy | Manufacturing | 2017 |
| EJi Oy | Financial services | 2022 |
| EKA Itä Oy | Administrative & support | 2009 |
| EKOSAIMAA Oy | Wholesale & retail | 2020 |
| EMWELL Ky | Arts & recreation | 2015 |
| ERP-Invest Oy | Financial services | 1998 |
| ESE-Energia Oy | Energy | 2023 |
| ESE-Tekniikka Oy | Construction | 1994 |
| ESE-Verkko Oy | Energy | 2003 |
| EST Energy Save Technologies Oy | Professional & scientific | 2014 |
| EST Henkilöstöpalvelut Oy | Administrative & support | 2017 |
| Eastagentur Oy | Professional & scientific | 2016 |
| Eastern Finland Forestal Industries Oy | Agriculture & fishing | 2019 |
| Eeme-Team Oy | Administrative & support | 2023 |
| Eepin Grilli Oy | Hospitality | 2024 |
| Eija Karjalainen Ky | Hospitality | 2001 |
| EkoAarreKauppa Oy | Wholesale & retail | 2018 |
| Elena Mikkeli Oy | Wholesale & retail | 2017 |
| Elena Shop Oy | Wholesale & retail | 2021 |
| EliAs Design Ky | Professional & scientific | 2011 |
| Ellin aarrearkku Oy | Financial services | 2022 |
| Elvera Oy | Construction | 1995 |
| Eläinklinikka Kurki Oy | Professional & scientific | 2010 |
| Elämäsi Kunnossa Terveyspalvelut Oy | Health & social care | 2012 |
| Emi's Beauty House Oy | Other services | 2023 |
| Enerva Oy | Energy | 2019 |
| Enerwise Oy | Professional & scientific | 2023 |
| Enonkosken Lämpö Oy | Energy | 1995 |
| Entos Oy | Construction | 1988 |
| Environics Oy | Manufacturing | 1986 |
| Epic Works Oy | Arts & recreation | 2020 |
| Esittävän taiteen osuuskunta Kaukasus | Arts & recreation | 2016 |
| Espinta Oy | Hospitality | 2021 |
| Esratek Oy | Construction | 2016 |
| Esser Oy | Real estate | 1987 |
| Esta Casa Oy | Wholesale & retail | 2006 |
| Etelä-Savon Arvomarjaosuuskunta | Agriculture & fishing | 1979 |
| Etelä-Savon Energia Oy | Financial services | 1993 |
| Etelä-Savon Hevosrehut Oy | Wholesale & retail | 2018 |
| Etelä-Savon Huoneistomarkkinat Oy | Real estate | 2014 |
| Etelä-Savon Hydrauliikkakeskus Oy | Wholesale & retail | 1996 |
| Etelä-Savon Invest Oy | Administrative & support | 1995 |
| Etelä-Savon Kiinteistönotariaatti Oy | Professional & scientific | 1981 |
| Etelä-Savon Kotihoitajat Oy | Administrative & support | 2011 |
| Etelä-Savon Koulutus Oy | Education | 2009 |
| Etelä-Savon Laskenta ja Konsultointi Ky | Professional & scientific | 1990 |
| Etelä-Savon Monitoimipalvelu Oy | Wholesale & retail | 2014 |
| Etelä-Savon Puolesta Oy | Arts & recreation | 2023 |
| Etelä-Savon Rengaskeskus Oy | Wholesale & retail | 2026 |
| Etelä-Savon Satoja Oy | Construction | 2018 |
| Etelä-Savon Sijoittajat Oy | Financial services | 1983 |
| Etelä-Savon Teleasennus Oy | Construction | 1990 |
| Etelä-Savon Tili ja Laskenta Ky | Professional & scientific | 2008 |
| Etelä-Savon Tulkkikeskus Oy | Professional & scientific | 2024 |
| Etelä-Savon Turvallisuuspalvelut Oy | Administrative & support | 2013 |
| Etelä-Savon Työkonehuolto Oy | Manufacturing | 2017 |
| Etelä-Savon Vesi Oy | Water & waste | 1995 |
| Etelä-Savon Yrityskehitys Oy | Professional & scientific | 2016 |
| Etukone Oy | Other services | 1988 |
| Euro Ale Roponen Ky | Real estate | 1970 |
| Eurofins Viljavuuspalvelu Oy | Professional & scientific | 1952 |
| Evain Systems Oy | Information & communication | 2016 |
| Event Production Finland Oy | Arts & recreation | 2012 |
| Evermo Oy | Professional & scientific | 2023 |
| Evienne Puhtaus Oy | Administrative & support | 2026 |
| Evision Oy | Construction | 2021 |
| FH Olari Kehitys Ky | Construction | 2018 |
| FLIkka Capital Oy | Administrative & support | 2019 |
| FastShop Oy | Wholesale & retail | 2021 |
| Fendomec Oy | Wholesale & retail | 2000 |
| Ferdos Oy | Other services | 2026 |
| Fiksuauto Ky | Wholesale & retail | 2013 |
| FinRom Oy | Construction | 2022 |
| FinService A&C Oy | Wholesale & retail | 2016 |
| Finanne Oy | Professional & scientific | 2024 |
| Finconel Oy | Manufacturing | 2018 |
| Finnflow Oy | Wholesale & retail | 1998 |
| Finnish Home Constructions Oy | Construction | 2004 |
| Finnish NGO Center Oy | Administrative & support | 2008 |
| Finskin Oy | Hospitality | 1984 |
| Finti Oy | Manufacturing | 2025 |
| Finwake Oy | Wholesale & retail | 2012 |
| Firei Oy | Financial services | 2026 |
| Firewise Nordic Oy | Professional & scientific | 2025 |
| First of all solutions Oy | Information & communication | 2020 |
| Fish Deli Palvelukonsepti Oy | Administrative & support | 2003 |
| Fix Station Oy | Other services | 2004 |
| Flowrex Oy | Information & communication | 2026 |