| Regnbuebarna AS | Education | 2013 |
| Regnskapspartner Sør AS | Professional & scientific | 2004 |
| Reinhardtsen Holding AS | | 2021 |
| Renocare AS | Administrative & support | 2018 |
| Rep Og Utleie AS | Transport & logistics | 2025 |
| Repove Ans | Construction | 2003 |
| Responspartner AS | Information & communication | 2000 |
| Resvik Foto AS | Professional & scientific | 2022 |
| Revs Holding AS | | 2026 |
| Revs Invest AS | Real estate | 2026 |
| Ribes Reserve AS | Real estate | 2006 |
| Rimmereiden AS | | 2026 |
| Rimåsli Invest AS | Real estate | 2018 |
| Riqueza AS | Health & social care | 2022 |
| Risholt Skogsdrift AS | Agriculture & fishing | 1991 |
| Rita Og Lars Holding AS | | 2025 |
| Rivingen AS | Agriculture & fishing | 2016 |
| RJ Eiendom AS | Real estate | 2005 |
| Rjes AS | Information & communication | 2025 |
| RMC Eiendom AS | Construction | 2019 |
| RMC Eiendomsinvest AS | Real estate | 2020 |
| Rne Holding AS | | 2022 |
| Roasim Holding AS | | 2025 |
| Robert Ruud Bygg AS | Construction | 1991 |
| Robert Ruud Holding AS | Construction | 2005 |
| Robert Vagner Kjøkkenmontering AS | Construction | 2019 |
| Rolf Nilsen AS | Real estate | 1987 |
| Rommet Holding AS | | 2021 |
| Roresanden AS | Real estate | 2019 |
| Rosa Blikk AS | Construction | 2022 |
| Rosenvold Ans | Real estate | 2006 |
| Rosenvold Drift AS | Construction | 2026 |
| Roy Woxholt AS | Construction | 2022 |
| Royal Montasjebygg AS | Construction | 1997 |
| Royal Utvikling AS | Real estate | 2023 |
| RT Utleie Service 2 AS | Administrative & support | 2026 |
| RT Utleie Service AS | | 2026 |
| Rune Invest AS | Wholesale & retail | 2016 |
| Rune Å Valborgland AS | Construction | 1993 |
| Rustibus Worldwide AS | Wholesale & retail | 2018 |
| Ryggfrisk AS | Health & social care | 2025 |
| Rådyrveien 36 AS | Real estate | 2019 |
| Røinås & Slettene Eiendom AS | Real estate | 2009 |
| Røinås Holding AS | | 2005 |
| Rønnes AS | Real estate | 2007 |
| Rørendal AS | Real estate | 2022 |
| Rørmoen Bygg AS | Construction | 2020 |
| Rørmoen Holding AS | Financial services | 2020 |
| S Og B AS | Construction | 2012 |
| S Pettersen Holding AS | | 2023 |
| S-Tre Bygg AS | Construction | 2016 |
| S.H.B Holding AS | Financial services | 2005 |
| Sab Service AS | Administrative & support | 2015 |
| Sabrura Grimstad AS | Hospitality | 2021 |
| Saga & Co. - Beauty House AS | Other services | 2026 |
| Sagvannsveien 89 AS | Real estate | 2026 |
| Salong Pili AS | Other services | 2012 |
| Salvehølen Holding AS | Financial services | 2013 |
| Salvesen & Sønn Ans | Agriculture & fishing | 2005 |
| Salvesen Bygg AS | Construction | 1998 |
| Sam Berg AS | Manufacturing | 2012 |
| Sammalt AS | Wholesale & retail | 2026 |
| Sandholla Eiendom AS | Real estate | 2025 |
| Sandholla Holding AS | | 2025 |
| Saola Sør AS | Administrative & support | 2025 |
| Sara Agentur AS | Wholesale & retail | 1989 |
| Saxon Asset Management AS | Professional & scientific | 2026 |
| Saxon Property AS | Real estate | 2024 |
| SB Verksted Og Transport AS | Other services | 2023 |
| Searoads AS | Transport & logistics | 2015 |
| Searoads Eiendom AS | Real estate | 2015 |
| Second Hand Price AS | Information & communication | 2014 |
| Seed of AS | Education | 2017 |
| Selektiv Invest AS | Real estate | 1983 |
| Selektiv Respons AS | Administrative & support | 2015 |
| Semisub Holding AS | Professional & scientific | 2025 |
| Sentrumsgården Grimstad AS | Real estate | 2016 |
| Setsaa Holding AS | Professional & scientific | 2012 |
| Setsaa Konsult AS | Professional & scientific | 2015 |
| Sevhan Holding AS | Professional & scientific | 2022 |
| Sevrinsen Bygg & Montasje AS | Construction | 1995 |
| Sfkj Holding AS | | 2022 |
| SFV Auto AS | Wholesale & retail | 2026 |
| SGK Invest AS | Transport & logistics | 2025 |
| SH Sveis AS | Manufacturing | 2015 |
| Sibai AS | | 2023 |
| Sigmond AS | Information & communication | 2008 |
| Signal Analysis Lab AS | Professional & scientific | 2016 |
| Sigurvon AS | Agriculture & fishing | 2024 |
| Silent Edge Studio AS | Information & communication | 2026 |
| Silex Ocean AS | Agriculture & fishing | 2024 |
| Silverdale AS | Real estate | 2017 |
| Silverspoon AS | Hospitality | 2026 |
| Simos Invest AS | Financial services | 2015 |
| Singularity AS | | 2025 |
| Sirius Ny AS | Wholesale & retail | 2026 |
| Sirius-Norge AS | Wholesale & retail | 2018 |
| Sist Eiendom AS | Real estate | 2025 |
| Sist Holding AS | Real estate | 2025 |
| Site Office Grimstadkontoret Da | Administrative & support | 2001 |