| Nobeleng AS | Real estate | 1933 |
| Nonnos AS | Wholesale & retail | 2001 |
| Nord Arkitektur AS | Professional & scientific | 2004 |
| Nordic Productions AS | Information & communication | 2025 |
| Nordkirurgi AS | Health & social care | 2018 |
| Nordre Langseth Skog Da | Agriculture & fishing | 1997 |
| Nordsurg AS | Health & social care | 2014 |
| Norpag AS | Professional & scientific | 2010 |
| Norsk Energiforvaltning AS | Professional & scientific | 1984 |
| Norwayfood AS | Wholesale & retail | 2025 |
| Noréngruppen AS | | 2018 |
| Notos Klimateknikk Da | Wholesale & retail | 2003 |
| NPG AS | Agriculture & fishing | 2019 |
| NSF Løvenskioldbanen AS | Arts & recreation | 2021 |
| Nybøen Holding AS | | 2024 |
| Nye Olnima AS | Real estate | 2020 |
| Nye Stier AS | Administrative & support | 2020 |
| Nyvold Invest AS | | 2026 |
| Nøkling Invest AS | | 2019 |
| Odlu AS | | 2021 |
| Offiseren AS | | 2011 |
| Ofreco AS | Wholesale & retail | 1993 |
| Ojah Real Estate AS | Real estate | 2012 |
| Olweus Holding AS | | 2022 |
| Oppsving Invest AS | | 2013 |
| Optimal Ernæring AS | Education | 2014 |
| Oranch Eiendom AS | Real estate | 2025 |
| Orevia AS | Professional & scientific | 2025 |
| Oscars Holding AS | | 2026 |
| Ovåge AS | Financial services | 2017 |
| Ow Trading AS | | 2022 |
| Part X Consulting AS | Professional & scientific | 2018 |
| Patski Love Holding AS | Arts & recreation | 2018 |
| Patski Love Music AS | Arts & recreation | 2018 |
| PD Invest AS | | 2020 |
| Peho-Invest AS | Real estate | 1996 |
| Pelifix Invest AS | Real estate | 2008 |
| Persefone AS | | 2020 |
| Petite Frisørene Eiksmarka AS | Other services | 2018 |
| Pibco AS | Financial services | 2005 |
| Pippa AS | Wholesale & retail | 2013 |
| Pmde AS | Professional & scientific | 1999 |
| Pongen AS | Wholesale & retail | 2005 |
| Pontypandy AS | | 2022 |
| Portcap AS | Real estate | 2017 |
| Preppa AS | Information & communication | 2025 |
| Prestmosvegen AS | Real estate | 2023 |
| Profile Advice AS | Professional & scientific | 2004 |
| Progressus Invest AS | | 2021 |
| PT Eiendom AS | Construction | 2025 |
| Puckdrop AS | Professional & scientific | 2023 |
| Put Invest AS | Real estate | 2016 |
| Pålskudd AS | | 2022 |
| Quality Holding AS | Professional & scientific | 1992 |
| Quioz Scandinavia AS | Wholesale & retail | 2007 |
| Quooker Norge AS | Wholesale & retail | 2007 |
| Rakatut AS | Real estate | 2019 |
| Regnskap Spesialistene AS | Professional & scientific | 2020 |
| Resiliens AS | Professional & scientific | 2018 |
| Resolva AS | Professional & scientific | 2026 |
| Rivelsrud Invest AS | | 2018 |
| Rob Invest AS | | 2021 |
| Roball Holding AS | Financial services | 2000 |
| Rolf Sveaass AS | Professional & scientific | 1978 |
| Roxtec AS | Wholesale & retail | 1998 |
| Royalwings AS | | 2016 |
| Rpeee AS | | 2025 |
| Rscs Hydracloud AS | Information & communication | 2015 |
| Rubigoråza AS | Education | 2025 |
| Ruglandveien Holding AS | | 2021 |
| Rørkunst AS | | 2016 |
| Saga Trade Da | | 1988 |
| Sagn AS | Information & communication | 2006 |
| Sah AS | | 2020 |
| Salma AS | Real estate | 2014 |
| Sandberg Finans AS | Professional & scientific | 1992 |
| Sank AS | | 2025 |
| Sapientia AS | Professional & scientific | 2014 |
| Schreiner Invest AS | Information & communication | 2024 |
| Schreiner Security AS | Information & communication | 2025 |
| Scio AS | Real estate | 2017 |
| Seawood 2 AS | Professional & scientific | 2019 |
| Seawood AS | Financial services | 2016 |
| Seli Holding AS | Real estate | 2020 |
| Sharoyan Industries AS | | 2025 |
| Shrimple Games AS | Information & communication | 2025 |
| Sicv AS | Information & communication | 2020 |
| Siesta AS | Information & communication | 2003 |
| Simle AS | Wholesale & retail | 2023 |
| Sirkulasjon AS | Professional & scientific | 2018 |
| Sirva AS | Transport & logistics | 1988 |
| Sitron Invest AS | Financial services | 2018 |
| Siv Ing Bjørn Einar Bjartnes AS | Professional & scientific | 2021 |
| Siv. Ing. Harald Moe & Co AS | Professional & scientific | 2014 |
| Sivilingeniør Espen Aarum AS | Real estate | 1987 |
| Skogshorn Eiendom AS | Real estate | 1982 |
| Skogstien Invest AS | Financial services | 2005 |
| Snekker I Oslo AS | Construction | 2014 |
| Snillhest AS | Information & communication | 2024 |
| Sniper Paintball AS | Arts & recreation | 1999 |