| 3B-FIBREGLASS Norway AS | Manufacturing | 1970 |
| Aamlid Invest AS | Construction | 2005 |
| Aamlid Invest Bygg AS | Construction | 2013 |
| Aas-Mehren AS | | 2026 |
| Ae Asfalt Og Betong Knusing AS | Mining & quarrying | 2023 |
| Agder Betonggulv AS | Construction | 2023 |
| Agder Flis AS | Transport & logistics | 2014 |
| Agder Kalk AS | Construction | 2024 |
| Agder Sprinkler AS | Construction | 1994 |
| Agder Tre Trading 2015 AS | Manufacturing | 2015 |
| Agder Varmepumpe AS | Construction | 2020 |
| Airdrone AS | Professional & scientific | 2025 |
| Alfanor 26059 AS | | 2026 |
| Arctic Circuits AS | Wholesale & retail | 2023 |
| Arne Røstad AS | Construction | 2025 |
| Arnesen & Nyhaven AS | Construction | 2019 |
| Arsa AS | Manufacturing | 2022 |
| Asbjørn Mollestad Og Sønner AS | Transport & logistics | 1998 |
| Asfaltfres Sør AS | Construction | 2016 |
| Avløpsservice Norge AS | Water & waste | 2015 |
| Bakkan Eigedom AS | Real estate | 2014 |
| BGB Eiendom AS | Real estate | 2011 |
| Bil Og Maskin AS | Other services | 1997 |
| Birkeland Apotek AS | Wholesale & retail | 2016 |
| Birkeland Bil AS | Other services | 2017 |
| Birkeland Blikk AS | Construction | 2023 |
| Birkeland Blomsterpark AS | Agriculture & fishing | 2004 |
| Birkeland Bygg Og Anlegg AS | Construction | 2022 |
| Birkeland Bygg Og Anlegg Eiendom AS | Real estate | 2022 |
| Birkeland Bygg Og Anlegg Holding AS | Construction | 2022 |
| Birkeland Elektro AS | Construction | 1990 |
| Birkeland Hudpleie AS | Other services | 2021 |
| Birkeland Hårstudio AS | Other services | 1999 |
| Birkeland Jern & Farge AS | Wholesale & retail | 1990 |
| Birkeland Klinikken AS | Health & social care | 2017 |
| Birkeland Pizza AS | Hospitality | 2018 |
| Birkeland Pub AS | Hospitality | 2021 |
| Birkeland Servicesenter AS | Wholesale & retail | 2009 |
| Birkeland Storkiosk Pizza & Grill AS | Hospitality | 2015 |
| Birkeland Taxi Sentral Ba | Transport & logistics | 1999 |
| Birkenes Auto & Handel AS | Wholesale & retail | 2003 |
| Birkenes Bolig Utvikling AS | Real estate | 2025 |
| Birkenes Byggsenter AS | Wholesale & retail | 1997 |
| Birkenes Byggsenter Eiendom AS | Real estate | 2013 |
| Birkenes Fus Barnehage AS | Education | 2021 |
| Birkenes Regnskapskontor AS | Professional & scientific | 2005 |
| Birkenes Skog AS | Agriculture & fishing | 2026 |
| Birkenes-Avisa AS | Information & communication | 2002 |
| Bjarne Kylland AS | Agriculture & fishing | 2021 |
| BL Anlegg AS | Construction | 2021 |
| BL Entreprenør Og Eiendom AS | Construction | 2021 |
| Blomdesign by Karoline Eide AS | Arts & recreation | 2024 |
| Bråten Eiendom Sør AS | Real estate | 2013 |
| BTG Solenergi AS | Wholesale & retail | 2019 |
| BVH Bygg AS | Construction | 2020 |
| Bybergs Hage AS | Administrative & support | 2025 |
| Byggfirma Knut Å Aamlid AS | Construction | 2002 |
| Byggfirma Trond Tveit AS | Construction | 2020 |
| Byggmester Aabel AS | Construction | 2023 |
| Byggmester Audun Heia AS | Construction | 2008 |
| Byggmester Olav Aabel AS | Construction | 2019 |
| Ca Consult AS | Professional & scientific | 2017 |
| Camp Flakksvann AS | Hospitality | 2020 |
| CHR Strand Invest AS | Construction | 2021 |
| Daju Invest AS | Real estate | 2024 |
| Drangsholt AS | Administrative & support | 2026 |
| Edb Invest AS | Real estate | 2015 |
| Einar Flakk Verksted AS | Other services | 2016 |
| Ek Event AS | Professional & scientific | 2020 |
| Ellinor Holding AS | Real estate | 2013 |
| Endresen AS | Construction | 2024 |
| Engebu AS | Wholesale & retail | 2017 |
| Erlend Rugsland AS | Construction | 2021 |
| Es Energy AS | Real estate | 2019 |
| Evertrust AS | | 2026 |
| Evolt AS | Wholesale & retail | 2011 |
| Fagmaleren Fred Thorsen Og Sønn AS | Construction | 2013 |
| Fidjetun AS | Hospitality | 2019 |
| Flaa Kran Og Transport AS | Transport & logistics | 2003 |
| Flakksvann Bolig AS | Real estate | 2012 |
| Flaksvatn Maskin Da | Construction | 2005 |
| Flammen Birkeland AS | Hospitality | 2026 |
| Flesjå Tunnel AS | | 2021 |
| Flørenesvann AS | Water & waste | 1990 |
| Foss Fabrikker AS | Manufacturing | 1968 |
| Foss Invest AS | Manufacturing | 2005 |
| Frass Products AS | Manufacturing | 2026 |
| Frigstad Holding AS | Real estate | 2015 |
| Frihet AS | Information & communication | 2012 |
| Førevann Barneskitrekk | Arts & recreation | 2002 |
| GH Entreprenør Og Eiendom AS | Real estate | 2021 |
| GLM AS | Wholesale & retail | 2014 |
| Grimestadveien 2B AS | Real estate | 2012 |
| Grødum Holding AS | Real estate | 2016 |
| Grøfta AS | Water & waste | 2021 |
| GS Consulting AS | | 2016 |
| Gullknapp Pharma AS | Wholesale & retail | 2005 |
| Gunnar Aarli AS | Transport & logistics | 2020 |
| Gunnar Hauge AS | Administrative & support | 2008 |
| Hampehaugen Barnehage AS | Education | 2006 |