| Nce Holding AS | Manufacturing | 1991 |
| Nextiform AS | Professional & scientific | 2025 |
| Niac AS | Real estate | 2020 |
| Nios AS | Manufacturing | 2017 |
| Nios Group AS | Manufacturing | 2022 |
| Nocab AS | Wholesale & retail | 2023 |
| Norcolour AS | Manufacturing | 1997 |
| Nordautobil AS | Wholesale & retail | 2023 |
| Nordic Light Service AS | Wholesale & retail | 2016 |
| Nordic Motion AS | | 2025 |
| Nordre Grimsøen Brygge 2002 SA | Real estate | 2002 |
| Norsk Dun AS | Manufacturing | 1987 |
| Norskinn AS | Wholesale & retail | 2001 |
| Numenor AS | Information & communication | 2023 |
| Nye Nios AS | Manufacturing | 2023 |
| Nyseth Grave- Og Eiendomsservice AS | Construction | 2025 |
| O-J Invest AS | Construction | 2019 |
| O. Larsen Holding AS | Education | 2019 |
| Oat Holding AS | | 2022 |
| Oddvar Talberg AS | Construction | 1997 |
| Olaf Telle AS | Professional & scientific | 2024 |
| Olseng Vestre Drift Da | Real estate | 2007 |
| Ortodoks Forlag Da | Information & communication | 2023 |
| Ottimo AS | Professional & scientific | 2016 |
| Ownit AS | Real estate | 2001 |
| Paletten Familiebarnehage AS | Education | 2022 |
| Palma Kiosk & Kaffebar AS | Hospitality | 2017 |
| Peka Ans | Wholesale & retail | 1995 |
| Per Bjørn Aasen AS | Wholesale & retail | 2020 |
| Picasso Familiebarnehage AS | Education | 2022 |
| Plutus-Arete AS | | 2022 |
| Pole Position Eiendom AS | Real estate | 2025 |
| Powercord AS | Wholesale & retail | 2015 |
| Powersupport AS | Manufacturing | 2022 |
| Presiz Eiendom AS | Real estate | 2013 |
| Prosess Holding AS | Real estate | 2025 |
| Pstordal AS | Professional & scientific | 2007 |
| Pure Consulting AS | Real estate | 1998 |
| Ranum Holding AS | | 2018 |
| Ravneng Lyd Og Musikk AS | Administrative & support | 2015 |
| Ravneng Marina AS | Transport & logistics | 2012 |
| Rene Bygg AS | Administrative & support | 2013 |
| Renmagi Tak Og Fasade AS | Administrative & support | 2026 |
| Restaurant Salt AS | Hospitality | 2023 |
| Ringen Invest AS | | 2026 |
| Risikokonsulenten AS | Professional & scientific | 2013 |
| RL Bil Og Eiendom AS | Wholesale & retail | 2005 |
| Roger Dahl Eiendom AS | Real estate | 2016 |
| RRR AS | Professional & scientific | 2024 |
| RRT AS | Professional & scientific | 2008 |
| RS Gruppen AS | Manufacturing | 2023 |
| Rune Talberg Rørlegger AS | Construction | 2016 |
| Ruths Regnskapstjenester AS | Professional & scientific | 2023 |
| Rånes Fjellsprenging AS | Construction | 2022 |
| Rød Brannteknikk AS | Professional & scientific | 2023 |
| Rør & Sveiseservice AS | Manufacturing | 2022 |
| Rørlegger Magnus Talberg AS | Construction | 2020 |
| S M Holding AS | Real estate | 2021 |
| Salix Eiendom AS | Real estate | 2019 |
| Sand Kroa I Høysand AS | Hospitality | 2026 |
| Sander Telle Invest AS | Real estate | 2026 |
| Sarpsborg Boligutleie AS | Real estate | 2014 |
| SB Lyd AS | Administrative & support | 2023 |
| Sb-Ødegård AS | | 2024 |
| Schjølberg Trafikkskole AS | Education | 2017 |
| Sdhc AS | Wholesale & retail | 2020 |
| Sealight AS | Manufacturing | 2016 |
| Seilbåtservice AS | Manufacturing | 2018 |
| Semcode AS | Information & communication | 2020 |
| Serviceleverandøren AS | Construction | 2025 |
| SG Byggservice AS | Construction | 2018 |
| Simad Holding AS | | 2021 |
| Sivilingeniør Isebakke AS | Professional & scientific | 2026 |
| Sivilingeniørene Stenrød AS | | 2025 |
| Sjøli Invest AS | Wholesale & retail | 1979 |
| Skaar Industrisøm AS | Manufacturing | 2022 |
| Skargards Badestamp AS | Wholesale & retail | 2015 |
| Skjeberg Auto AS | Other services | 2000 |
| Skjeberg Autosenter AS | Wholesale & retail | 2021 |
| Skjeberg Blikkenslagerverksted AS | Construction | 2017 |
| Skjeberg Bygg & VVS AS | Construction | 2025 |
| Skjeberg Eiendom AS | Real estate | 1972 |
| Skjeberg Elektro AS | Construction | 2005 |
| Skjeberg Frisørsenter Ans | Other services | 1992 |
| Skjeberg Marinesenter AS | Arts & recreation | 1973 |
| Skjeberg Transport-Teknikk AS | Transport & logistics | 1991 |
| Skjeberg Trapp AS | Construction | 2023 |
| Skjeberg Vestre Holding AS | | 2026 |
| SKL Service AS | Other services | 2021 |
| Skogsmann Linjerydding Og Trefelling AS | Agriculture & fishing | 2008 |
| Skorpen Holding AS | | 2021 |
| Skrapekartet AS | Information & communication | 2024 |
| Solberg Forvaltning AS | | 2023 |
| Solberg Skog Og Linjerydding AS | Agriculture & fishing | 2023 |
| Solenga Eiendom AS | Real estate | 2014 |
| Solskjermingsmannen AS | Wholesale & retail | 2018 |
| Solvtech AS | Manufacturing | 2006 |
| Sorlie Invest AS | Financial services | 2014 |
| ST Regnskaps Consult AS | Professional & scientific | 2011 |
| Stasjonsbyen Legesenter AS | Health & social care | 2003 |