| Båtbranschens Teknologicentrum BTC Ab | Construction | 1988 |
| Båtbyggeri Enqvist Ab | Manufacturing | 2011 |
| CAG Invest Ab | Financial services | 2023 |
| CB Consult & Build Ab | Professional & scientific | 2020 |
| CDS Capital Ab Oy | Wholesale & retail | 2026 |
| Chompyum Matexpress Franchising Internationell AB | Hospitality | 2025 |
| CKJM Invest Oy | Professional & scientific | 2023 |
| CKO Invest Ab Oy | Financial services | 2020 |
| CMP INVEST Ab | Real estate | 2021 |
| CORE Communications Ab | Professional & scientific | 2026 |
| CamLac Ab Oy | Construction | 2020 |
| Cambridge Ohjelma Finland Oy | Wholesale & retail | 2008 |
| Canko Ab | Manufacturing | 2016 |
| Capido Oy | Professional & scientific | 2007 |
| Car Invest Finland Ab Oy | Wholesale & retail | 2020 |
| Car-Trade T. Sandström Ab | Wholesale & retail | 2014 |
| Carent Oy Ab | Construction | 2016 |
| Carl Jakob Consulting Ab | Other services | 2026 |
| Carota Nova Oy | Professional & scientific | 2022 |
| Casa Delivery Ab Oy | Transport & logistics | 2020 |
| Cashmeir Ab | Financial services | 2026 |
| Castor Wear Ab Oy | Wholesale & retail | 2025 |
| Cat Like Me Entertainment Oy | Arts & recreation | 2017 |
| Cerafiina Oy Ab | Wholesale & retail | 2015 |
| Chrissan Ab | Financial services | 1993 |
| Cibit Ab | Information & communication | 1996 |
| Cinaed Oy | Financial services | 2017 |
| Co Capita Invest AB | Financial services | 2021 |
| Coast Consulting Ab Oy | Professional & scientific | 2007 |
| Cold Waters Osk | Arts & recreation | 2020 |
| Comfort Family Hotel Oy Ab | Hospitality | 2005 |
| Corisalis Oy | Agriculture & fishing | 2018 |
| Cosmetique Salon Ab | Other services | 2012 |
| Crewhub Oy Ab | Administrative & support | 2020 |
| CrossFit Jeppis Ab | Arts & recreation | 2014 |
| Crystal Art Finland Ab | Manufacturing | 2011 |
| Cyrris Kb | Manufacturing | 1993 |
| DJE Group Oy | Professional & scientific | 2023 |
| Davod Ab | Hospitality | 2021 |
| Dayton Pohjanmaa Oy | Manufacturing | 2019 |
| De La Garde Ab | Manufacturing | 2025 |
| DekoSound Oy | Wholesale & retail | 2013 |
| Desport World Finland Oy | Arts & recreation | 2015 |
| DewDropScent AB | Wholesale & retail | 2022 |
| DiBi BL Oy | Professional & scientific | 2020 |
| Digikirjanpito Rasti Oy | Professional & scientific | 2025 |
| DimWei Group Oy Ltd | Wholesale & retail | 2015 |
| Dirty Fries öppet bolag | Arts & recreation | 2026 |
| Disponent Simon Enkvist Ab | Real estate | 2025 |
| Disponentbyrå Datacon Ab | Real estate | 2009 |
| Do Eat Oy | Hospitality | 2019 |
| Dobra Finland Oy Ab | Administrative & support | 2019 |
| Droneca Oy | Professional & scientific | 2025 |
| Duendemar Oy | Hospitality | 2017 |
| Dux Horses Oy | Agriculture & fishing | 2026 |
| Däckhuset Lyks Rengastalo Ab Oy | Wholesale & retail | 1996 |
| E-PACT Oy Ab | Professional & scientific | 2021 |
| EA-Rakennuttajat Oy | Professional & scientific | 2021 |
| EF Tech Ab | Financial services | 1978 |
| EK Lacto kommanditbolag | Agriculture & fishing | 1996 |
| ENQUITY Ab | Real estate | 2024 |
| Etiqette OY | Professional & scientific | 2006 |
| EVA Housing Oy | Real estate | 2023 |
| EXENOR Ab Oy | Construction | 2026 |
| Edsvik vindpark Ab | Energy | 2013 |
| Edukaskills Oy | Education | 2021 |
| Eklund Design Ab | Professional & scientific | 2025 |
| Eklund Invest Ab | Real estate | 2018 |
| Eklund-Storrank Oy | Financial services | 2007 |
| Eklöv Holdings Ab Oy | Financial services | 2018 |
| Ekman & Co | Real estate | 2003 |
| EkoMek Ab | Other services | 2024 |
| Ekofish Ab | Agriculture & fishing | 2018 |
| Ekya Holding Ab | | 2026 |
| Eleca Oy | Professional & scientific | 2010 |
| Elevate Concepts Ab | Professional & scientific | 2012 |
| Emet Entreprenad, öppet bolag | Transport & logistics | 1989 |
| Emex Light Oy | Manufacturing | 2018 |
| Ena Golv & Tak Ab | Construction | 2007 |
| Ena Trading Ab | Wholesale & retail | 2010 |
| Enetron Oy | Manufacturing | 2024 |
| Enkel Ab | Information & communication | 2021 |
| Enviro Tech Ab Oy | Professional & scientific | 2023 |
| Equatorn Sales Oy Ltd | Wholesale & retail | 2024 |
| Eremenko Sport Consulting Ab | Arts & recreation | 2021 |
| Eric Storvall Endurance Ab | Arts & recreation | 2017 |
| Erikssons Bolagen Ab | Manufacturing | 1985 |
| Erikssons Fastighets Ab | Real estate | 1995 |
| Erkin Halli Oy | Wholesale & retail | 2000 |
| Esse El-Byrå, öppet bolag | Construction | 1996 |
| Estradum Ab Oy | Arts & recreation | 2018 |
| Euro Guide Consulting Ab | Professional & scientific | 1996 |
| Euroports Pietarsaari Oy Ab | Transport & logistics | 1984 |
| Evolvia Ab Oy | Financial services | 2001 |
| Ewapower Ab Oy | Water & waste | 1995 |
| EzyVideo Productions Oy | Professional & scientific | 2024 |
| F. Penttinen Ab Oy | Real estate | 2010 |
| F:ma Kurt Byggmästar, öppet bolag | Wholesale & retail | 1996 |
| FCV - Finnish Competence Validation Ab | Professional & scientific | 2020 |
| Fenix Capital AB | Real estate | 2012 |