| Entreprenør Greg Bygg AS | Construction | 2014 |
| Eplan AB, Filial Nuf | Information & communication | 2009 |
| Eplehageutvikling AS | Real estate | 2019 |
| Epoxycon Byggentreprenør AS | Construction | 1996 |
| Equipnor AS | Wholesale & retail | 1996 |
| Eril AS | Professional & scientific | 2025 |
| Ermesjø Eiendom AS | Real estate | 2005 |
| Erva Bygg AS | Construction | 2022 |
| Ervik AS | Wholesale & retail | 2002 |
| Eseyas Transport AS | Transport & logistics | 2024 |
| Esg Prosjekt AS | Construction | 2013 |
| Espen S. Møller AS | Construction | 2013 |
| Estator Eiendomsmegling AS | Real estate | 2005 |
| Ethica Law AS | Professional & scientific | 2016 |
| Eurostair AS | Wholesale & retail | 2010 |
| Evenrud & Sønn AS | Real estate | 2022 |
| Everlong AS | Real estate | 2012 |
| Everymatrix Norway AS | Information & communication | 2023 |
| Evidencia AS | Arts & recreation | 2012 |
| Evident Garanti AS | Financial services | 2013 |
| Exact Regnskap Ans | Professional & scientific | 1999 |
| Exactus AS | | 2021 |
| Export Og Salg Av Biler AS | Wholesale & retail | 2026 |
| Extra Plass Minilager AS | Real estate | 1996 |
| Extraction Technologies Norway AS | Professional & scientific | 2013 |
| Ez Money AS | Arts & recreation | 2020 |
| F Levo AS | | 2024 |
| F.E.H.Invest AS | | 2024 |
| Fab Adventures AS | Administrative & support | 2017 |
| Fabillio AS | Information & communication | 2022 |
| Fabillio Group AS | Information & communication | 2023 |
| Fairly AS | | 2020 |
| Faktum Faktura AS | Information & communication | 2006 |
| Fartygskonstruksjoner AB | Manufacturing | 1995 |
| Fasil AS | Administrative & support | 2014 |
| Fauskene AS | | 2024 |
| Fayes Gate 5 AS | Real estate | 1972 |
| Fed Holding AS | Hospitality | 2021 |
| Fellesen AS | Information & communication | 2023 |
| Ferdig Betong AS | Real estate | 1986 |
| FGH AS | | 2016 |
| Fieldnet AS | Information & communication | 1994 |
| Filemail AS | Information & communication | 2009 |
| Filskov AS | Real estate | 1997 |
| Final Cut for Real Norway AS | Information & communication | 2019 |
| Finance Resources Aj AS | Professional & scientific | 2024 |
| Finhansen AS | | 2025 |
| Finnegården AS | Households | 1981 |
| Finstad Mat AS | Wholesale & retail | 1996 |
| Finzenity AS | Information & communication | 2025 |
| Fire S Invest AS | | 2026 |
| Firskur Fritid AS | Real estate | 2020 |
| Fjellstadvegen 25 AS | Real estate | 2020 |
| FLAVOR2YOU Development AS | Professional & scientific | 2011 |
| Flicker AS | Information & communication | 2025 |
| Flisagenten AS | Wholesale & retail | 1994 |
| Fliskunstnerne AS | Construction | 2016 |
| Floto Invest AS | Real estate | 2026 |
| Flytteklar AS | Administrative & support | 2025 |
| Flåm Invest AS | Real estate | 1984 |
| Fløisbonn Selveierlag SA | Real estate | 2013 |
| FMH Invest AS | | 2024 |
| Folkets Hus Ski SA | Real estate | 1995 |
| Follo Auto AS | Wholesale & retail | 2026 |
| Follo Autoco AS | Other services | 1986 |
| Follo Bad Og Interiør AS | Construction | 2011 |
| Follo Bil Og Service AS | Other services | 2024 |
| Follo Boliginvest AS | Real estate | 2017 |
| Follo Boligutvikling AS | Real estate | 2018 |
| Follo Bygg Og Eiendom AS | Construction | 2006 |
| Follo Bygg Og Eiendom Holding AS | Real estate | 1998 |
| Follo Bygg Og Utemiljø AS | Construction | 2007 |
| Follo Catering AS | Hospitality | 2013 |
| Follo Eiendom Invest AS | Real estate | 1997 |
| Follo Eiendomsmegling AS | Real estate | 2007 |
| Follo Fjernvarme AS | Energy | 1998 |
| Follo Flis & Bad AS | Construction | 2013 |
| Follo Foto AS | Wholesale & retail | 2003 |
| Follo Fysioterapi Da | Health & social care | 2016 |
| Follo Golfsenter AS | Education | 1997 |
| Follo Graveservice AS | Construction | 1993 |
| Follo Hi-Fi Ans | Wholesale & retail | 1991 |
| Follo Kabel-Tv Montasje AS | Construction | 1998 |
| Follo Kiropraktorsenter AS | Health & social care | 2006 |
| Follo Liftutleie AS | Administrative & support | 2014 |
| Follo Logopedi AS | Health & social care | 2016 |
| Follo Lungeklinikk AS | Health & social care | 2021 |
| Follo Minibuss Ans | Transport & logistics | 1998 |
| Follo Rekruttering Og Bemanningsbyrå AS | Administrative & support | 2016 |
| Follo Renhold Og Flyttebyrå AS | Administrative & support | 2024 |
| Follo Rørleggerservice AS | Construction | 1996 |
| Follo Solskjermingsteknikk AS | Construction | 2023 |
| Follo Supply AS | Wholesale & retail | 2020 |
| Follo Tak Og Vedlikehold AS | Construction | 1998 |
| Follo Takst AS | Professional & scientific | 2012 |
| Follo Transport AS | Transport & logistics | 2024 |
| Follo Tre Og Hageservice AS | Agriculture & fishing | 2022 |
| Follo Vaktmesterselskap AS | Administrative & support | 2013 |
| Follo Vann & Varme AS | Construction | 2020 |
| Follo Varmepumpe Teknikk AS | Construction | 2018 |