| Portside Holding AS | | 2020 |
| Posa Eiendom AS | Real estate | 2025 |
| Prinsensgate 33 Ans | | 1988 |
| Privat Skadedyrkontroll AS | Administrative & support | 2018 |
| Pro Sport AS | Wholesale & retail | 1991 |
| Promotion Factory AS | Wholesale & retail | 2013 |
| Prosjektleder Jonny Olsen AS | Professional & scientific | 2021 |
| R Sætre Eiendom AS | Real estate | 2023 |
| R Sætre Holding AS | Wholesale & retail | 2023 |
| R-Tech Holding AS | | 2026 |
| Rakke Og Trefoten Va-Lag SA | | 2026 |
| Rakkebåene AS | Wholesale & retail | 2005 |
| Ramn Vann- Og Avløp AS | Water & waste | 2018 |
| Ramn Vann- Og Avløpslag SA | Real estate | 2017 |
| Raugland AS | Professional & scientific | 1998 |
| RCP AS | Health & social care | 2020 |
| Reno AS | Information & communication | 2025 |
| Ringdal Næringsutvikling AS | Real estate | 2021 |
| Risøya Eiendom AS | Real estate | 2012 |
| Rugland Vann Og Avløp SA | Water & waste | 2020 |
| Rune Ottem Holding AS | Professional & scientific | 2023 |
| RVB Prosjekt AS | Professional & scientific | 2023 |
| Rådhusgaten 17 Stavern AS | Real estate | 2021 |
| Rørleggermester Dokken AS | Construction | 2025 |
| Røyken Båtservice AS | Transport & logistics | 2015 |
| S.L. Invest AS | | 2023 |
| S.R.B. Service Ltd Nuf | Hospitality | 2004 |
| Safety Rope AS | Professional & scientific | 2010 |
| Saga Shipping AS | Transport & logistics | 1969 |
| Salonatur AS | Professional & scientific | 2026 |
| Sam-Men AS | Professional & scientific | 2013 |
| Samlerkammeret AS | Wholesale & retail | 2018 |
| Sandanger Holding AS | Financial services | 2005 |
| Sandar Invest AS | Real estate | 2014 |
| Sandvold Eiendom AS | Real estate | 2016 |
| Sarepta Økonomi Autorisert Regnskapsførerselskap AS | Professional & scientific | 2025 |
| Sauna & Spa Norge AS | Wholesale & retail | 2010 |
| Schau Takst AS | Professional & scientific | 2011 |
| Schøning AS | Administrative & support | 2021 |
| Selsveen AS | | 2022 |
| Sensorium AS | Wholesale & retail | 2020 |
| Sensorutvikling AS | | 2005 |
| Sh-Invest AS | Financial services | 2005 |
| Ship Shine AS | Professional & scientific | 2026 |
| Silkeskogen AS | Professional & scientific | 2021 |
| Silsoft Studio AS | Information & communication | 2022 |
| Sinclair Holding AS | Administrative & support | 2015 |
| Singlot AS | Information & communication | 2016 |
| Sjøgløtt Stavern AS | Wholesale & retail | 2025 |
| Sjøparken Helse AS | Real estate | 2018 |
| Sjøsterk Treningssenter AS | Arts & recreation | 2024 |
| Skibs-Aktieselskapet Iver Bugge | Transport & logistics | 1984 |
| Skipperstua Restaurant AS | Hospitality | 2004 |
| Skjerpen AS | Information & communication | 2026 |
| Skogbakken AS | Construction | 2016 |
| Sleveland Holding AS | | 2020 |
| Smaragd Holding AS | Agriculture & fishing | 2005 |
| Smartere Invest AS | Real estate | 2012 |
| Smartlager Norge AS | Administrative & support | 2008 |
| Smørstein Holding AS | Wholesale & retail | 2005 |
| Soalv 567 Holding AS | | 2023 |
| Solegg AS | Financial services | 2012 |
| Solem Invest AS | | 2025 |
| Solplassen Café Og Kolonial AS | Hospitality | 2009 |
| Solplassen Camping AS | Hospitality | 2019 |
| Solstadløkka Prosjekt AS | Real estate | 2024 |
| Somo Bygg AS | Construction | 2026 |
| SP1 Eiendom AS | Real estate | 2018 |
| Staferni Eiendom AS | | 2000 |
| Stall T AS | Education | 2021 |
| Stalos Holding AS | | 2023 |
| Stavern Bensin Og Service AS | Wholesale & retail | 1994 |
| Stavern Byggmarked AS | Real estate | 1991 |
| Stavern Dagligvaredrift AS | Wholesale & retail | 2016 |
| Stavern Dykkersenter AS | Transport & logistics | 2010 |
| Stavern Elektroprosjektering AS | Construction | 2026 |
| Stavern Frisør AS | Other services | 2023 |
| Stavern Helse Og Forvaltning AS | Health & social care | 2005 |
| Stavern Holding AS | Wholesale & retail | 2021 |
| Stavern Invest AS | Real estate | 2005 |
| Stavern Jernvaredrift AS | Wholesale & retail | 2015 |
| Stavern Legekontor Ans | Health & social care | 1996 |
| Stavern Marina AS | Real estate | 1989 |
| Stavern Maritime Senter AS | Wholesale & retail | 2017 |
| Stavern Pizza Og Grill AS | Hospitality | 2017 |
| Stavern Pub AS | Hospitality | 2024 |
| Stavern Regnskap AS | Administrative & support | 2026 |
| Stavern Skalldyr AS | Wholesale & retail | 2020 |
| Stavern Skiltmakeri Ans | Manufacturing | 1994 |
| Stavern Sushi AS | Hospitality | 2020 |
| Stavern Treningssenter AS | Arts & recreation | 2018 |
| Stavern Vvs&Vedlikehold AS | Construction | 2025 |
| Stavernopplevelser AS | Administrative & support | 2022 |
| Stellamare AS | Real estate | 2011 |
| Stilbygg Vestfold AS | Construction | 2016 |
| Stokkeskog Invest AS | Financial services | 2005 |
| Stolpestad Camping AS | Hospitality | 1990 |
| Stretere Camping AS | Hospitality | 1997 |
| Stretere Gård Ans | Agriculture & fishing | 2021 |
| Stretere Kiosk AS | Hospitality | 2017 |