| Noventia Global AS | Professional & scientific | 2024 |
| NS Holding AS | Real estate | 2009 |
| Ntex AS | Transport & logistics | 2011 |
| Nylenna Eiendom AS | Real estate | 2020 |
| Næringstjenester AS | Health & social care | 1995 |
| Næringstomter AS | Real estate | 2022 |
| O Westad & Sønner AS | Transport & logistics | 1982 |
| Oberrauter Bygg Og Sprengning AS | Construction | 2015 |
| Ohlord AS | | 2025 |
| Olekro Holding AS | | 2024 |
| Olsen Bygg & Eiendom AS | Construction | 2018 |
| Oluf Lorentzen AS | Wholesale & retail | 1986 |
| Ombudstvedt Holding AS | Real estate | 2021 |
| On:U Vestby AS | Wholesale & retail | 2017 |
| Opsal Anlegg AS | Construction | 2025 |
| Orbitvu Norge AS | Professional & scientific | 2026 |
| Oslo Fashion Outlet AS | Real estate | 2006 |
| Oslo Og Akershus Drenering Og Byggservice AS | Construction | 2026 |
| Oslo Regnskap Sentral AS | Professional & scientific | 2025 |
| Overskudd Bidco AS | Wholesale & retail | 2021 |
| Overskudd Holdco AS | Wholesale & retail | 2021 |
| Overskudd Midco AS | Wholesale & retail | 2021 |
| Pantarei Services AS | Information & communication | 2020 |
| Partee Wear AS | Wholesale & retail | 2025 |
| Partysenter AS | Administrative & support | 2009 |
| PASSION4FITNESS Group AS | Professional & scientific | 2017 |
| Pawfectprint AS | Wholesale & retail | 2025 |
| Pen Y Ghent Hundesalong Da | Agriculture & fishing | 1988 |
| Pepperstadhjort AS | Manufacturing | 2020 |
| Pepvest AS | Hospitality | 2016 |
| Peremann Holding AS | | 2025 |
| Perlehuset AS | Wholesale & retail | 1996 |
| Pharma Helse AS | Wholesale & retail | 2020 |
| Plenus AS | Wholesale & retail | 2010 |
| Pluss+ AS | Wholesale & retail | 1997 |
| Port Og Industripartner AS | Wholesale & retail | 2011 |
| Port Og Industripartner Drift AS | Construction | 2015 |
| Portos Eiendom AS | Real estate | 2014 |
| Possidonio Boligtjenester AS | Construction | 2015 |
| Ppe Holding AS | | 2021 |
| Presterud Elektro AS | Construction | 2004 |
| Prima Auto AS | Wholesale & retail | 2026 |
| Prime Cargo AS | Transport & logistics | 2004 |
| Prime Cargo Solutions AS | Transport & logistics | 2026 |
| Print Gruppen AS | Wholesale & retail | 2022 |
| Proffit AS | Information & communication | 2021 |
| Promiteam AS | Health & social care | 2018 |
| Promod AS | Construction | 2013 |
| Proråd AS | Professional & scientific | 2024 |
| PS Solid Bygg AS | Construction | 2022 |
| PSA52B AS | Real estate | 1985 |
| Purdam Aviation AS | Transport & logistics | 2026 |
| Pureblyss AS | Wholesale & retail | 2024 |
| Purl Fiction Studio Da | Wholesale & retail | 2026 |
| PVH Norge AS | Wholesale & retail | 2010 |
| Pyth Invest AS | | 2024 |
| På Nytt Byggservice AS | Construction | 2022 |
| Quatro Invest AS | Real estate | 2002 |
| Rajapack AS | Wholesale & retail | 1984 |
| Ramme Arkitekter AS | Professional & scientific | 2022 |
| Ramson AS | Real estate | 1989 |
| Ramson Packaging AS | Wholesale & retail | 2008 |
| Randem Gaard AS | Real estate | 2018 |
| REGIO360 Rådgivning AS | Professional & scientific | 2018 |
| REGIO360 Utvikling AS | Professional & scientific | 2018 |
| Rehabpartner AS | Wholesale & retail | 2018 |
| Renbest AS | Administrative & support | 2019 |
| Renedykk AS | Education | 2019 |
| Rival AS | Manufacturing | 1993 |
| RKK Holding AS | | 2024 |
| Rocksoup AS | Information & communication | 2024 |
| Roeste AS | Real estate | 2018 |
| Ross Konsult AS | Professional & scientific | 2019 |
| Royal Vision AS | Hospitality | 2019 |
| Ruby Invest AS | | 2024 |
| Rustadtunet AS | Professional & scientific | 2005 |
| Ryggegarasjen AS | Real estate | 2023 |
| Rygol Da | Wholesale & retail | 2009 |
| Ryternanorge AS | Wholesale & retail | 2014 |
| Revisjonsselskapet A/S | Professional & scientific | 1986 |
| Rådhusparken Næring AS | Real estate | 2025 |
| Røed /Tømt Da | Agriculture & fishing | 2012 |
| Rønning Anlegg AS | Construction | 2005 |
| Saa Revhaug Gård AS | Real estate | 2022 |
| Saglia 5 AS | Real estate | 1969 |
| Saglia Drift AS | Health & social care | 2006 |
| Saida Bygg AS | Construction | 2013 |
| Saida Montasje AS | Construction | 2022 |
| Saksera Frisør Da | Other services | 2004 |
| Sandbukta Invest AS | | 2016 |
| Sans Trafikkskole Vestby AS | Education | 2023 |
| Sarpsborg Regnskap AS | Professional & scientific | 2014 |
| Scandicorp AS | Professional & scientific | 2015 |
| Scandinavian Supply Ans | Wholesale & retail | 1993 |
| Scandinavian Travel Service AS | Transport & logistics | 2013 |
| Scandinavian Vision AS | Professional & scientific | 2015 |
| Schau's Buss AS | Transport & logistics | 1982 |
| Schau's Holding AS | Transport & logistics | 1977 |
| Schau's Invest AS | | 2005 |
| Schibsted Trykk Oslo AS | Manufacturing | 1995 |