| Nyborgveien 1-19 Samvirkeforetak SA | Real estate | 1992 |
| Nye Elkotek Handel AS | Wholesale & retail | 2010 |
| O-H Invest AS | | 2021 |
| Odd Rygh Satelitt-Tv AS | Construction | 1984 |
| Ohmberg AS | Information & communication | 2023 |
| Okba Holding AS | | 2020 |
| Oksen AS | Financial services | 2017 |
| Ole Klomsæt Service AS | Manufacturing | 2023 |
| Olfi AS | Real estate | 2006 |
| Onmumo AS | | 2024 |
| Op Transport Og Graving AS | Construction | 2025 |
| Opplæringskontoret I Follo AS | Education | 2020 |
| Oppsiden Invest AS | | 2018 |
| Orion AS | Real estate | 1997 |
| Oslo & Follo Graveservice AS | Construction | 2015 |
| Oslo Lydutleie AS | Administrative & support | 2018 |
| P.H Medical AS | Health & social care | 2017 |
| Panders AS | | 2026 |
| Parfyme Paradiset AS | Wholesale & retail | 2025 |
| Pavlovs Hunder Ans | Arts & recreation | 2022 |
| Per Bye Christiansen Prosjekt AS | Real estate | 1985 |
| Phei Holding AS | | 2023 |
| PHH Innovasjon AS | Professional & scientific | 2018 |
| Philip Dalen Holding AS | Professional & scientific | 2025 |
| Plan Søk AS | Administrative & support | 2016 |
| Platzack Holding AS | | 2025 |
| Play! Invest AS | Administrative & support | 2020 |
| Plumme AS | Information & communication | 2026 |
| PMC Norge Nuf | Professional & scientific | 2006 |
| Polarhagen Lofoten AS | Agriculture & fishing | 2022 |
| Polymath AS | Information & communication | 2023 |
| Popcorn Compagniet AS | Wholesale & retail | 1989 |
| Pope Holding AS | Professional & scientific | 2015 |
| Potten Eiendom AS | Real estate | 2023 |
| Prego Bygg Tjenester AS | Construction | 2024 |
| Presisjons Maler AS | Construction | 2018 |
| Prodrift AS | Administrative & support | 2012 |
| Proff Prosjekt AS | Professional & scientific | 2016 |
| Profilartikler AS | Professional & scientific | 2025 |
| Proforum AS | Professional & scientific | 2016 |
| Property Advisors AS | Professional & scientific | 2017 |
| Propit AS | Real estate | 2021 |
| Quality in Chemical Analysis Nuf | Professional & scientific | 2016 |
| Quantum Gravity Computers AS | Professional & scientific | 2024 |
| Railway Robotics AS | Manufacturing | 2019 |
| Railway Robotics Consulting AS | Information & communication | 2021 |
| Railway Robotics Services AS | Manufacturing | 2021 |
| Rang Bygg AS | Construction | 2026 |
| Ratun AS | Professional & scientific | 2020 |
| Raukvilevippa Holding AS | Professional & scientific | 2023 |
| Raveien 9 AS | Real estate | 1995 |
| Ravine AS | | 2024 |
| Realty Norge AS | Real estate | 2018 |
| Renew Norway AS | Real estate | 2023 |
| Resø Invest AS | | 2022 |
| Rheingold AS | | 2021 |
| Rikken Invest AS | | 2025 |
| Rogne Investment AS | Real estate | 2020 |
| Rtcareer AS | Education | 2025 |
| Rustad Antennelag SA | Information & communication | 1995 |
| Rytling AS | | 2023 |
| Rådhusplassen Eiendom AS | Real estate | 2019 |
| Ræin Invest AS | Professional & scientific | 2024 |
| S. Sandnes AS | Construction | 2014 |
| S.W. Holding AS | Wholesale & retail | 2014 |
| Saebo AS | Professional & scientific | 2023 |
| Sagabygget AS | Real estate | 1995 |
| Sagalund AS | | 2022 |
| Salgsspesialistene AS | Professional & scientific | 2024 |
| Samuel & Joshua AS | Transport & logistics | 2020 |
| Samuel AS | Hospitality | 2023 |
| Scandinavian Brew AS | Wholesale & retail | 2014 |
| Schytz AS | Professional & scientific | 2008 |
| Sea Consulting AS | Professional & scientific | 2012 |
| Sefas AS | | 2019 |
| Sentraltak AS | Construction | 2026 |
| Sentrumsgården Ås AS | Real estate | 2007 |
| Servanda AS | Information & communication | 2024 |
| Sharpe Invest AS | | 2021 |
| SHB Trafikkopplæring AS | Education | 2026 |
| Sicast Ventures AS | | 2024 |
| Sier Invest AS | Financial services | 2005 |
| Sigberg AS | Professional & scientific | 2026 |
| Siggerud Eiendom AS | Real estate | 2020 |
| Siggerud Holding AS | Manufacturing | 2020 |
| Sikkerhet Og Data AS | Information & communication | 2016 |
| Sikring- Og Servicetjenester AS | Administrative & support | 1990 |
| Sinvest Holding AS | | 2019 |
| Siri Fjellheim Invest AS | Financial services | 2013 |
| Siv Ing JT Indrebø Engineering AS | Professional & scientific | 2016 |
| Siv.Ing. Terje Eknes AS | Professional & scientific | 2012 |
| SK 12 0G 14 AS | Real estate | 2018 |
| Skagex AS | Construction | 2023 |
| Skills Matter | Information & communication | 2009 |
| Skipenes Ventures AS | | 2026 |
| Skjelby AS | Professional & scientific | 2021 |
| Skogfaret Arkitekter AS | Professional & scientific | 2023 |
| Skogfaret Holding AS | | 2026 |
| Skogsbilveilaget Himdalen SA | Real estate | 1969 |
| Skytterhytta AS | Real estate | 2009 |