| Roscher Holding AS | | 2025 |
| Roscher Invest AS | Real estate | 2013 |
| Rose Invest Holding AS | | 2025 |
| Rose Marketing AS | Professional & scientific | 2025 |
| Rotech AS | | 2019 |
| Roy Paulsen Holding AS | Construction | 2008 |
| Roystig Eiendom AS | Real estate | 2022 |
| RSF Invest AS | Real estate | 2022 |
| Rtjen Invest AS | Administrative & support | 2017 |
| Ruho AS | | 2025 |
| Rukon AS | Professional & scientific | 2012 |
| Rune Hellevik Holding AS | Real estate | 2012 |
| Rune Nilsen Eiendom Invest AS | Real estate | 1993 |
| Rutgerson Digital AS | Information & communication | 2022 |
| Rutgerson Holding AS | Information & communication | 2022 |
| Ruva Energy AS | Professional & scientific | 2021 |
| Rød Pepper AS | Wholesale & retail | 2023 |
| Rønning Vaktmestertjenester AS | Administrative & support | 2017 |
| Rønningen Boligfelt AS | Real estate | 2015 |
| Rønningen Invest AS | Professional & scientific | 1999 |
| Rørlegger Halvorsen AS | Construction | 1992 |
| Røydalen Holding AS | | 2020 |
| S Rose Eiendom AS | | 2024 |
| S.A.B. Utvikling AS | Real estate | 2025 |
| Sabrura Arendal AS | Hospitality | 2022 |
| Sagagården AS | Real estate | 2023 |
| Sailtuv AS | Arts & recreation | 2009 |
| Samkjøp SA | Wholesale & retail | 2001 |
| Sandbacka AS | Professional & scientific | 2024 |
| Sandås AS | Real estate | 1991 |
| Sandås Eiendom AS | Real estate | 1999 |
| Sanma AS | Wholesale & retail | 2008 |
| Satithas Thaimassasje AS | Other services | 2024 |
| Saxe AS | Professional & scientific | 2024 |
| Sbak Holding AS | | 2022 |
| SBAS1 AS | Real estate | 2014 |
| SBAS2 AS | Real estate | 2012 |
| Scandia Steel Norway AS | Wholesale & retail | 2025 |
| Scandibev AS | Wholesale & retail | 2012 |
| Scandic Agder AS | Wholesale & retail | 2021 |
| Scandinavian Vision Science and Technology AS | Health & social care | 2011 |
| Scanestopint AS | Professional & scientific | 2023 |
| Scanmatic AS | Manufacturing | 1971 |
| Schlanbusch Holding AS | Financial services | 2018 |
| Schuur AS | Real estate | 2022 |
| Sea Farm Technologies AS | Agriculture & fishing | 2016 |
| Seafarer CV AS | Information & communication | 2017 |
| Sealoading CTV 1 AS | Transport & logistics | 2015 |
| Sealoading CTV 2 AS | Transport & logistics | 2015 |
| Sealoading CTV 3 AS | Administrative & support | 2020 |
| Sealoading Holding AS | Transport & logistics | 2014 |
| Seapen AS | Information & communication | 2021 |
| Seaview AS | Real estate | 2007 |
| Seikilen AS | Financial services | 2004 |
| Seines Retail AS | Wholesale & retail | 2008 |
| Seldal Berg AS | Administrative & support | 2025 |
| Seljåsen Gård AS | Wholesale & retail | 2015 |
| Senab Eikeland Sør AS | Wholesale & retail | 1990 |
| Sentrum Parkering Arendal AS | Transport & logistics | 2009 |
| Senum Invest AS | Education | 2016 |
| Setoma Holding AS | Real estate | 2016 |
| Shape Frisør AS | Other services | 2003 |
| Shlers Beauty Salong AS | Other services | 2020 |
| Shoreline Equity AS | | 2025 |
| Si-Buss AS | Transport & logistics | 2007 |
| Sifre AS | Professional & scientific | 2016 |
| Sigmund Aasen AS | Other services | 1969 |
| Sikon AS | Professional & scientific | 2025 |
| Sikon Holding AS | | 2025 |
| Siku AS | | 2020 |
| Simple Apps AS | Information & communication | 2016 |
| Sini AS | | 2018 |
| Sini Kiropraktikk AS | Health & social care | 2020 |
| Siring AS | Construction | 2006 |
| Sistech AS | Information & communication | 2019 |
| Sisters AS | Hospitality | 2019 |
| Sitepartner AS | Professional & scientific | 2015 |
| Siv Ing Øivind B Berntsen AS | Professional & scientific | 1990 |
| Siv.Ark Einar Myraker Mnal Npa AS | Professional & scientific | 2018 |
| Sivert W Svane AS | Agriculture & fishing | 2014 |
| Sivilarkitekt Kristian Asdal AS | Professional & scientific | 2017 |
| Sivilingeniør Håkon Seljåsen AS | Professional & scientific | 2017 |
| Sjøsenteret Arendal AS | Wholesale & retail | 2018 |
| Skagen Arendal AS | Hospitality | 2025 |
| Skagerrak Arrangement Da | Administrative & support | 2003 |
| Skalleberg Eiendom Arendal AS | Real estate | 2017 |
| Skalleberg Eiendom AS | Real estate | 2016 |
| Skalleberg Invest AS | | 2023 |
| Skarli Forsikring AS | Financial services | 2016 |
| Skatt Og Regnskapsrådgivning AS | Administrative & support | 2018 |
| Skeidar Arendal AS | Wholesale & retail | 1995 |
| Skid Road Kustom AS | Manufacturing | 2021 |
| Skilsø Bygg AS | Construction | 2006 |
| Skilsøferga AS | Transport & logistics | 2002 |
| Skipsaksjeselskapet Remonstrant | Real estate | 1916 |
| Skjønnhaug & Felle Eiendom AS | Real estate | 2026 |
| Skogsbilveglaget Råbuveien SA | Real estate | 2017 |
| Skoll Invest AS | Real estate | 2021 |
| Skredderplassen AS | Construction | 2006 |
| Skreden Lassesen Invest AS | Professional & scientific | 2021 |