| El-Skade AS | Construction | 2013 |
| El-Vis Elektro AS | Construction | 2016 |
| Electrolysis Advisory & Engineering AS | Professional & scientific | 2026 |
| Elektro 4 AS | Construction | 2000 |
| Elektro Partner Skien AS | Real estate | 2005 |
| Elektro Team AS | Construction | 2016 |
| Elektroservice Skien AS | Construction | 2020 |
| Elektrosveis AS | Manufacturing | 2006 |
| Elementdesign Ans | Construction | 2006 |
| Elevator Pitch AS | | 2023 |
| Eleven Points AS | Wholesale & retail | 2021 |
| Elhagi Holding AS | | 2020 |
| Eliot Holding AS | Hospitality | 2014 |
| Elisabeth Sageie AS | Wholesale & retail | 2005 |
| Elite Frisør Og Velvære AS | Other services | 2023 |
| Eljach Invest AS | Real estate | 2004 |
| Ellefsen AS | | 2022 |
| Elpro Ans | Wholesale & retail | 1993 |
| Elset Auto AS | Wholesale & retail | 2025 |
| Elseth Maskin AS | Administrative & support | 1978 |
| Elseth Og Gullesen AS | Administrative & support | 2026 |
| Elsetvegen 7 AS | Real estate | 2021 |
| Eltempo AS | Wholesale & retail | 2015 |
| Eltorn Bunad Atelier AS | Manufacturing | 2007 |
| Eluin Holding AS | | 2026 |
| Elva Invest AS | Professional & scientific | 2020 |
| Elvetunet Utvikling AS | Real estate | 2024 |
| Em Service AS | Manufacturing | 2024 |
| Emerense AS | Wholesale & retail | 2018 |
| Emida Holding AS | Real estate | 2024 |
| Emp Eiendom AS | Real estate | 2015 |
| Emp Retail AS | Wholesale & retail | 2024 |
| Emso Holding AS | | 2018 |
| Emsy Invest AS | Construction | 2021 |
| Emt Bolig AS | Real estate | 2022 |
| Emt Eiendom AS | Real estate | 2024 |
| Emuna AS | | 2024 |
| Endless Pole Studio AS | Education | 2022 |
| Endre Andersen Holding AS | | 2020 |
| Endre Lekven AS | Professional & scientific | 2014 |
| Endringsarbeid AS | Education | 2000 |
| Enger Agentur & Eiendom AS | Real estate | 1998 |
| Enggrav Holding AS | | 2026 |
| Enggravslia Invest AS | | 2024 |
| Enkel Bilutleie AS | Administrative & support | 2009 |
| Enkelledelse AS | Professional & scientific | 2023 |
| Enl Solutions AS | Information & communication | 2026 |
| Enrx AS | Manufacturing | 1981 |
| Enrx Group AS | Manufacturing | 2021 |
| Enrx Holding AS | Manufacturing | 1989 |
| Entreprenør Ulf Solbakken AS | Construction | 1997 |
| Environmental Design & Innovations AS | Professional & scientific | 2002 |
| Eon 85 AS | Real estate | 1985 |
| Epb AS | Real estate | 2019 |
| Epenor AS | Wholesale & retail | 2005 |
| Equisør Holding AS | Professional & scientific | 2020 |
| Er-Holding AS | Construction | 2012 |
| Erco AS | | 1985 |
| Erdi Dive AS | Manufacturing | 2024 |
| Ergo Contech AB Nuf | Professional & scientific | 2015 |
| Erik Studsrød AS | Real estate | 1981 |
| Erik Tanche Nilssen AS | Wholesale & retail | 1968 |
| Erik Tanche Nilssen Invest AS | Wholesale & retail | 2005 |
| Eriksen Jan Åge Og Eva Wenstøp Ans | Agriculture & fishing | 1995 |
| Eriksrød Holding AS | | 2024 |
| Eriksrød Stenhuggeri AS | Manufacturing | 1995 |
| Erling & Hege Invest AS | | 2026 |
| Erma Holding AS | Other services | 2018 |
| Ernæringsgynekologen AS | Health & social care | 2024 |
| Erse Holding AS | | 2024 |
| Es Software AS | Information & communication | 2025 |
| Escendo AS | Construction | 2009 |
| Espen Goberg Lie Holding AS | Real estate | 2015 |
| Espen Hansen Holding AS | Professional & scientific | 2022 |
| Essinvest AS | Real estate | 2021 |
| Essnor AS | Professional & scientific | 2012 |
| Estato AS | Information & communication | 2021 |
| Etar AS | Real estate | 2001 |
| Etk Holding AS | Real estate | 2011 |
| Etronia AS | Real estate | 1989 |
| Ettermarked Bolig AS | Construction | 2013 |
| Euronordas Uab | Administrative & support | 2008 |
| Europakaffe AS | Hospitality | 2018 |
| Europeretro Da | Wholesale & retail | 2024 |
| Ev-En Holding AS | | 2020 |
| Evca Holding AS | Wholesale & retail | 2021 |
| Evceka AS | | 2019 |
| Eveline Karlsen AS | Real estate | 2020 |
| Event Horizon AS | Financial services | 2013 |
| Eventyrfabrikken Skien AS | Professional & scientific | 2025 |
| Evoltic AS | Construction | 2023 |
| Exact Aircraft AS | Manufacturing | 2015 |
| Excalibur 12 AS | Financial services | 2005 |
| Exodus AS | | 2024 |
| Express Utleie AS | Real estate | 2020 |
| Extra Asiamat AS | Wholesale & retail | 2014 |
| Extra Leker Skien AS | Wholesale & retail | 2005 |
| Extrahjelpen AS | Administrative & support | 2019 |
| F4 Invest AS | Real estate | 2022 |
| Factibilis AS | Professional & scientific | 2015 |