| Elohappi Oy | Construction | 2016 |
| Elshawadfi Holding Ab | Professional & scientific | 2024 |
| Eläinklinikka Avec Oy | Professional & scientific | 2014 |
| Elämänpiiri Oy | Professional & scientific | 2025 |
| Emko Oy | Manufacturing | 2004 |
| Emmy&Sami Oy | Health & social care | 2023 |
| Emve Suomi Finland Oy Ab | Wholesale & retail | 1989 |
| Emäsalon Rakennuspalvelu Oy | Construction | 2015 |
| EnePro Oy | Professional & scientific | 2019 |
| Enemmän aikaa consulting Oy | Financial services | 2011 |
| Energylab Oy | Construction | 2006 |
| Enervent Zehnder Oy | Construction | 2018 |
| Enschildt Oy | Professional & scientific | 2026 |
| Ensto Finland Oy | Manufacturing | 2021 |
| Ensto Oy | Financial services | 2021 |
| Epetrade Oy | Wholesale & retail | 2014 |
| Epoon tietoverkko-osuuskunta | Information & communication | 2015 |
| Eppel Oy | Wholesale & retail | 2009 |
| Epta Finland Oy | Manufacturing | 2004 |
| Ervit Oy | Real estate | 2016 |
| Esineiden.net Oy | Wholesale & retail | 2017 |
| Esoteric Limited Faction Oy | Professional & scientific | 2018 |
| Espehaus Oy | Health & social care | 2025 |
| Espoon rakennushuolto Oy | Construction | 2020 |
| Essi Rämä Oy | Information & communication | 2011 |
| Estell Oy | Other services | 2011 |
| Esvian Oy | Manufacturing | 2021 |
| Etelä-Pornaisten Vesiosuuskunta | Water & waste | 2000 |
| Etelä-Suomen Erikoistekniikka Oy | Construction | 2021 |
| Etelä-Suomen Rakennussaneeraus Oy | Construction | 2025 |
| Etelä-Suomen Turvapalvelu Oy | Administrative & support | 2024 |
| Etelän Autoliike Oy | Wholesale & retail | 2023 |
| Etuhuolinta Jukka Halli Oy | Hospitality | 1986 |
| Eurium Oy | Professional & scientific | 2017 |
| Eurofin Palvelut Oy | Construction | 2021 |
| Eurovalmiste Oy | Wholesale & retail | 1978 |
| Excellent Safety Solutions Oy | Professional & scientific | 2023 |
| Executive Functioning Oy | Information & communication | 2023 |
| Eximius Foods Oy Ab | Wholesale & retail | 2010 |
| Express Cleaning Eila Oy | Administrative & support | 2018 |
| Exsane Oy | Construction | 2011 |
| Extreme Close-Up Production Oy | Information & communication | 1993 |
| F & M Grönqvist Ab Oy | Wholesale & retail | 1995 |
| F & M Konsult AB - OY | Financial services | 2006 |
| F&F Kiinteistöt Oy | Real estate | 2016 |
| F-Charter Oy | Transport & logistics | 2026 |
| FC - Koneistus Oy | Manufacturing | 2004 |
| FCAP Scandinavia Ab | Financial services | 2017 |
| FCR Consulting Oy | Professional & scientific | 2007 |
| FH Sähkö OY | Construction | 2024 |
| Fiberco OY AB | Professional & scientific | 2001 |
| Finform Design OY | Wholesale & retail | 2016 |
| FIXING OY Lampi & Lehtonen | Construction | 2007 |
| FRS Invest Oy | Other services | 2008 |
| FSF- viestintä Oy, Full Story Feature Finland | Professional & scientific | 1993 |
| Furein OY | Hospitality | 2017 |
| Factarec Oy | Professional & scientific | 1995 |
| Factatieto Oy | Real estate | 1977 |
| Fahlsten Capital Oy | Professional & scientific | 2025 |
| Fairies & Tales Oy | Wholesale & retail | 2025 |
| Fake Taxi Oy | Transport & logistics | 1960 |
| Fakir enterprise Oy Ab | Wholesale & retail | 2017 |
| Familia Koskinen avoin yhtiö | Other services | 2016 |
| Fast Ab Östermalms Hyvelspån | Real estate | 2019 |
| Fast Move Oy | Professional & scientific | 1988 |
| Fastighet Svenskan Ab | Real estate | 2025 |
| Fastighets Ab Depåvägen 1 | Real estate | 2022 |
| Fastighets Ab Elsie - Kiinteistö Oy Elsie | Real estate | 2009 |
| Fastighets Ab Emil | Real estate | 2007 |
| Fastighets Ab Krämaretorget | Real estate | 1990 |
| Fastighets Ab Mellangatan 6 i Borgå | Real estate | 1997 |
| Fastighets Ab Mästarvägen 31 / Kiinteistö Oy Mestarintie 31 | Real estate | 2023 |
| Fastighets Ab Runebergsgatan 34 | Real estate | 1975 |
| Fastighets Ab Sondarö Hamnar | Real estate | 1992 |
| Fastighets Ab Svenska Gården i Borgå | Real estate | 1997 |
| Fastighets Ab Östravägen 44 a i Borgå | Real estate | 2002 |
| Federal Appliances Finland Ky | Wholesale & retail | 1990 |
| Felissuon Maalaus, avoin yhtiö | Manufacturing | 2004 |
| Fenra Oy | Professional & scientific | 2009 |
| Ferme Agri Oy Ab | Wholesale & retail | 2000 |
| Fero Clothing Oy | Wholesale & retail | 2019 |
| Ferreton Oy | Construction | 2023 |
| Ferroman Engineering Oy | Wholesale & retail | 2015 |
| FiNiRi Oy | Real estate | 2015 |
| Fiime Oy | Wholesale & retail | 2016 |
| Fiksusti Kaunis Oy | Other services | 2013 |
| Filmark Oy | Administrative & support | 1997 |
| Finacore Oy | Professional & scientific | 2024 |
| Finacron Oy | Professional & scientific | 2004 |
| Finborga Oy | Administrative & support | 2022 |
| Findoco Nordic Oy | Professional & scientific | 2020 |
| Fineas Consulting Oy Ab | Professional & scientific | 2020 |
| FinestEco Oy | Other services | 2018 |
| Finha Trading Oy | Wholesale & retail | 1981 |
| Finmas Oy Ab | Wholesale & retail | 2011 |
| Finnsweet Holding Oy | Wholesale & retail | 2011 |
| Finnsweet Oy | Wholesale & retail | 1996 |
| Finntimo Oy | Professional & scientific | 1996 |
| Finntire Oy | Wholesale & retail | 1993 |
| Finntreat Oy | Professional & scientific | 1982 |