| Effektiv Montasje AS | Construction | 2024 |
| Efun Entreprenør AS | Construction | 2025 |
| Egeland Accounting AS | Professional & scientific | 2014 |
| Egotime AS | Wholesale & retail | 2021 |
| Ehh Capital AS | | 2026 |
| Eidanger Auto AS | Other services | 2009 |
| Eidanger Auto-Salg AS | Wholesale & retail | 2018 |
| Eidanger Barnehage AS | Education | 2002 |
| Eidangervegen Utvikling AS | Real estate | 2023 |
| Eide Leptir AS | Hospitality | 2006 |
| Eidsgaard AS | Real estate | 2021 |
| EIENDOM24 AS | Real estate | 2010 |
| Eiffage Genie Civil Nuf | Construction | 2020 |
| Eihc Invest AS | | 2026 |
| Eikvika Utbygging AS | Real estate | 2008 |
| Eilev AS | | 2021 |
| Einherje Film AS | Information & communication | 2013 |
| Eitos AS | Wholesale & retail | 2023 |
| Eivind Berg Holding AS | | 2021 |
| Ek Holding AS | Wholesale & retail | 2005 |
| Eksos Mester AS | Other services | 2006 |
| Ekstrahjelpen AS | Education | 2018 |
| El-Tools AS | Professional & scientific | 2022 |
| Eldorsen Auto AS | Wholesale & retail | 2024 |
| Eldorsen Holding AS | | 2026 |
| Electromarin AS | Manufacturing | 1991 |
| Elektro Mekanikk Ans | Manufacturing | 1985 |
| Elektroteknikk AS | Construction | 1992 |
| Elian Invest AS | Real estate | 2019 |
| Eliten AS | Construction | 2025 |
| Ellis Holding AS | | 2020 |
| Elseth Mur & Flis AS | Construction | 2023 |
| Elso AS | Real estate | 2018 |
| Eltavle Grenland AS | Manufacturing | 1999 |
| Elteco AS | Wholesale & retail | 2005 |
| Eltera Skagerrak AS | Construction | 2017 |
| Elvegata AS | Real estate | 1988 |
| Elveparken Brygge Bryggesamvirke SA | Arts & recreation | 2017 |
| Elverhøy Park AS | Real estate | 2016 |
| Emerson Automation Solutions AS | Wholesale & retail | 1988 |
| Emerson Process Management B.V. | Wholesale & retail | 2008 |
| Emiil AS | Arts & recreation | 2017 |
| EMIL3DPRINT AS | Professional & scientific | 2026 |
| Emma Thingstad AS | | 2021 |
| Empet Porsgrunn Dyreklinikk AS | Professional & scientific | 2008 |
| Emzi Holding AS | | 2020 |
| Energia AS | Wholesale & retail | 1993 |
| Energistopp AS | Wholesale & retail | 2018 |
| Engangsgrill Ans | Arts & recreation | 2025 |
| Engh Eiendom AS | Real estate | 1997 |
| Engh Vann Og Varme AS | Construction | 2023 |
| Entreprenør Bjaaland AS | Construction | 2015 |
| Entreprenørfinans AS | | 2021 |
| Eralloys Holding AS | Energy | 2007 |
| Eramet Norway AS | Manufacturing | 1999 |
| Erem Invest AS | | 2025 |
| Erik Pavels AS | Professional & scientific | 2026 |
| Erland Hansen AS | Wholesale & retail | 1987 |
| Ern Invest AS | Financial services | 2005 |
| Ernst Eiendom Og Bolig AS | Real estate | 2020 |
| Ernst Invest AS | Transport & logistics | 2007 |
| Eråk Holding AS | Real estate | 2014 |
| Espelia AS | | 2022 |
| Espelund Holding AS | Agriculture & fishing | 2005 |
| Espen Zondag Selvutvikling Og Gruppeterapi AS | Health & social care | 2019 |
| Estia AS | | 2005 |
| Et Holding AS | Manufacturing | 2005 |
| Etland Stave Retail AS | Wholesale & retail | 2023 |
| Etn Invest AS | Financial services | 2014 |
| Etterglød AS | Arts & recreation | 2024 |
| Eurobus Nordic AS | Wholesale & retail | 2018 |
| Europabussen AS | Administrative & support | 2011 |
| Evensen Graveservice AS | Construction | 2015 |
| Evjen Holding AS | Professional & scientific | 2012 |
| Evjen Revisjon AS | Professional & scientific | 2015 |
| Ex & Farlig Stoff AS | Professional & scientific | 2014 |
| Exentric AS | Wholesale & retail | 2020 |
| Expansion AS | | 2026 |
| Eå Holding AS | Information & communication | 2020 |
| Faber Argentarius AS | Professional & scientific | 2022 |
| Fagerliåsen Utbygging AS | Real estate | 2022 |
| Falkum Eiendom AS | Health & social care | 2002 |
| Farmed AS | Health & social care | 2015 |
| Farmors Kafe AS | Hospitality | 2023 |
| FAST SERVICE IMPORT Dewey DA | | 1988 |
| Fatayer Porsgrunn AS | Hospitality | 2025 |
| Fenomen AS | Information & communication | 2021 |
| Fenomen Invest AS | Information & communication | 2021 |
| Fenomen Studios AS | Information & communication | 2018 |
| Fenomen TV Film Og Scene AS | Information & communication | 2012 |
| Fenomen X 4 1/2 AS | Information & communication | 2016 |
| Ferjegata 1 AS | Real estate | 1980 |
| Feste Landskap Arkitektur Sør AS | Professional & scientific | 1991 |
| Festina Lente Eiendom AS | Real estate | 2021 |
| FH Maritim AS | Education | 2026 |
| Fibreflow AS | Wholesale & retail | 2026 |
| Fiks Hage Og Maskin AS | Wholesale & retail | 2011 |
| Filmplot AS | Information & communication | 2012 |
| Findal & Mørch AS | Professional & scientific | 2023 |
| Finndøla Kraftverk Da | Energy | 1975 |