| Olivnor AS | Hospitality | 2020 |
| Opplei AS | Administrative & support | 2026 |
| Opulent Auto AS | | 2024 |
| Oslo Student Hub AS | Administrative & support | 2024 |
| Oslo Vedlikehold Og Snekkerservice AS | Construction | 2008 |
| Oslo Øst Eiendomsservice AS | Administrative & support | 2007 |
| Ovibos Holding AS | | 2026 |
| Pa Rognstad Holding AS | Real estate | 2020 |
| Pak Supermarked AS | Wholesale & retail | 2022 |
| Panda IT AS | Other services | 2025 |
| Papirverkstedet AS | Education | 2006 |
| Parisa Og Keywan Da | Hospitality | 2006 |
| Pastro AS | Administrative & support | 2025 |
| Peace by Piece | Health & social care | 2013 |
| Pelle Bygg AS | Construction | 2021 |
| Pensjonsplan AS | Professional & scientific | 2014 |
| Per Hoberg AS | Wholesale & retail | 1962 |
| PETTERS1 AS | Professional & scientific | 2023 |
| Pho Hien AS | Hospitality | 2026 |
| Pilar Invest AS | Wholesale & retail | 2024 |
| Pillar Property AS | Real estate | 2026 |
| Pink Salmon Norway AS | Manufacturing | 2022 |
| Pirotee Invest AS | | 2025 |
| Placio Events AS | Professional & scientific | 2026 |
| Play Enterprise AS | Wholesale & retail | 2025 |
| Play Technology AS | Wholesale & retail | 2025 |
| Pol-Nor Consulting AS | Professional & scientific | 2013 |
| Postklart Distribusjon AS | Administrative & support | 1997 |
| Power Holding AS | Real estate | 2009 |
| Powerevent AS | Arts & recreation | 2006 |
| Pratec Norge AS | Wholesale & retail | 2010 |
| Prego Invest AS | Real estate | 1999 |
| Pro-Tek Entreprenør AS | Construction | 2022 |
| Proff Bygg AS | Construction | 2023 |
| Proff Byggmester AS | Construction | 2011 |
| Prokon AS | Construction | 2025 |
| Propanservice AS | Construction | 2004 |
| Psykiater Elena Soroka AS | Health & social care | 2024 |
| PZ Eiendom Service AS | Construction | 2016 |
| Qaa AS | | 2019 |
| Qid AS | Information & communication | 2023 |
| Quick Transportservice AS | Transport & logistics | 2022 |
| Quick-Print Hurtigtrykkeri AS | Manufacturing | 1996 |
| R. Westby Invest AS | | 2021 |
| Raisium AS | Information & communication | 2026 |
| Randmæl Pedersen Holding AS | | 2019 |
| Rasooi Indisk Catering AS | Hospitality | 2008 |
| Razibus Ans | | 1988 |
| Rd-Stillas AS | Construction | 2024 |
| Real Eiendom Invest AS | Real estate | 1993 |
| Renas Bedrift AS | Administrative & support | 1994 |
| Renhold Bjerke Avd Østlandet AS | Administrative & support | 2021 |
| Renhold Bjerke Avd. Innland AS | Administrative & support | 2025 |
| Resmar AS | | 2026 |
| Revisjonsfirma Tore D. Raasok AS | Professional & scientific | 2004 |
| Revisoren AS | Professional & scientific | 2004 |
| Rima AS | Real estate | 2014 |
| Rio Bygg Og Eiendom AS | Real estate | 2007 |
| Risaasen Invest AS | Wholesale & retail | 2022 |
| Ritas Beauty Salong AS | Other services | 2025 |
| Roark AS | | 2024 |
| Rog Nor AS | Hospitality | 2010 |
| Rognstad Konsult AS | Professional & scientific | 2020 |
| Rokkerud Holding AS | Financial services | 2012 |
| Romerike Låsservice AS | Other services | 2014 |
| Royal Banquet AS | Wholesale & retail | 2022 |
| Royal Bingodrift AS | Arts & recreation | 1999 |
| Royal Holding AS | Real estate | 2023 |
| Rsi Drift AS | Real estate | 2016 |
| Rune Sport AS | Real estate | 1972 |
| Ryland Holding AS | | 2026 |
| Rørleggermester Jensen AS | Construction | 2014 |
| S&C Holding AS | | 2021 |
| Saad Invest AS | | 2021 |
| Sabrura Strømmen AS | Hospitality | 2026 |
| Saeids Tepper AS | Wholesale & retail | 2024 |
| Safedirekte Ans | Wholesale & retail | 2013 |
| Sagdalsveien 10 AS | Real estate | 2004 |
| Sakura Cafeterie AS | Hospitality | 2005 |
| Sakura Eiendom AS | Hospitality | 2018 |
| Sakura Strømmen AS | Hospitality | 2015 |
| Sanda Butikkdrift AS | Wholesale & retail | 2012 |
| Sandvika Husflid AS | Wholesale & retail | 2026 |
| Sannerud-Holding AS | | 2023 |
| Sara Holding AS | Financial services | 2005 |
| Scanex Medical Systems AS | Wholesale & retail | 1989 |
| Schrøder Transport AS | Transport & logistics | 2023 |
| Selam Import & Export AS | Wholesale & retail | 2015 |
| Senemar AS | | 2024 |
| Sengen AS | | 2021 |
| Servicebedriften AS | Administrative & support | 2021 |
| Sese AS | Professional & scientific | 2019 |
| Shah Holding AS | | 2023 |
| Sham Kjøtt AS | Wholesale & retail | 2025 |
| SHL Trading AS | Wholesale & retail | 2024 |
| Shopdirekte AS | Information & communication | 2022 |
| Signatures Nails & Spa by Zarri AS | Other services | 2026 |
| Signaturklinikken Holding AS | Other services | 2018 |
| Signaturklinikken Strømmen AS | Other services | 2018 |
| Silja Trading AS | Professional & scientific | 2014 |