| 10BLANK AS | Professional & scientific | 2017 |
| Aanensen Bygg AS | Construction | 2021 |
| Agderleaks AS | Professional & scientific | 2025 |
| Alstra AS | Wholesale & retail | 1973 |
| Arnes Sveis AS | Manufacturing | 2007 |
| AS Østre Søndeled Og Risør Fjordruter | Transport & logistics | 1950 |
| Bommyr AS | Real estate | 2022 |
| Brattli Holding AS | Professional & scientific | 2017 |
| Brattli Invest AS | Professional & scientific | 2023 |
| Brødboksen Da | Manufacturing | 1990 |
| Buslåttvegen | Real estate | 1995 |
| Egons Servicenter AS | Wholesale & retail | 1994 |
| Ellingsvika Vann Og Avløp Nord SA | Water & waste | 2020 |
| Fips AS | Information & communication | 2016 |
| Frøyna Skogservice AS | Agriculture & fishing | 2026 |
| Gjernes Bygg AS | Construction | 2023 |
| Hommen Gård AS | Real estate | 2023 |
| Hytteservice Rumker AS | Administrative & support | 2019 |
| Håndverkerservice AS | Construction | 2023 |
| Indre Risør Skjærgård AS | Real estate | 2009 |
| Ioot AS | Professional & scientific | 2017 |
| Jegertunet AS | Hospitality | 2010 |
| Jernes Mineraliemølle AS | Real estate | 1913 |
| K. Jakobsen Holding AS | Real estate | 2019 |
| Kjell Moland Skogservice AS | Agriculture & fishing | 2014 |
| Klingra Utvikling AS | Real estate | 2011 |
| LD Lås Og Prosjekt AS | Construction | 2024 |
| Letti AS | Manufacturing | 2009 |
| Lille Utleie AS | Administrative & support | 2022 |
| Lunds Matsenter AS | Wholesale & retail | 1989 |
| Martina AS | Education | 1996 |
| Masdalen Maskinkompani AS | Construction | 1985 |
| Nor Services AS | Construction | 2010 |
| Po Invest AS | | 2017 |
| R.G. Holding AS | | 2019 |
| Rib Eiendom AS | Real estate | 2008 |
| Roar Holding AS | Wholesale & retail | 2009 |
| Rotvikveien Samvirkeforetak | Real estate | 2024 |
| Rye Strand AS | Real estate | 2002 |
| Sawhas Toilet AS | Manufacturing | 2019 |
| Sivik Gård AS | Construction | 2018 |
| Sliperiet AS | Real estate | 2021 |
| Slåttekjær Holding AS | | 2024 |
| Slåttekjær Invest AS | Arts & recreation | 2021 |
| Solkraftplus AS | Hospitality | 2022 |
| Ss-Universal AS | Professional & scientific | 2022 |
| Stavnes Båtservice AS | Transport & logistics | 2026 |
| Søndeled Bilverksted AS | Other services | 2006 |
| Søndeled Bruk AS | Wholesale & retail | 2013 |
| Søndeled Bygg AS | Real estate | 1980 |
| Søndeled Lille Eiendom AS | | 2025 |
| Søndeled Marina AS | Arts & recreation | 2021 |
| Søndeled Rørhandel AS | Construction | 2005 |
| Søndeledkroa AS | Administrative & support | 2003 |
| TMP Holding AS | Real estate | 2005 |
| Trollet AS | Wholesale & retail | 2020 |
| Trulsvik Eiendom AS | Real estate | 2010 |
| Tyri Naturforvaltning AS | Professional & scientific | 2024 |
| Tømrer Roger Myra AS | Construction | 2015 |
| Vestre Porthavn AS | Real estate | 2007 |
| Vindvik Tomteutvikling AS | | 2020 |
| Vollheia Vann Og Avløp SA | Water & waste | 2014 |
| Vrangsund Båthavn AS | Arts & recreation | 2011 |
| Ånonsmyr Vei Og Brygge SA | Real estate | 2018 |
| Ørshall AS | Real estate | 1987 |