| Nyroj Frisør AS | Other services | 2024 |
| Nyttbygg AS | Professional & scientific | 2014 |
| Næringslokalet Torget 5 AS | Real estate | 2021 |
| Nøkkeleiendom AS | Real estate | 1998 |
| O.H.L Holding AS | | 2024 |
| O.S.S. Hytte & Eiendomsutvikling AS | Real estate | 2007 |
| Odaf AS | Real estate | 2020 |
| Odd Fellow Huset AS | Real estate | 1979 |
| Oh Torget AS | Real estate | 2013 |
| Ohrtah Invest AS | Real estate | 2024 |
| Olav Digre Da | Hospitality | 2016 |
| Olav Haraldssonsgate AS | Real estate | 2023 |
| Old Tjikko AS | Real estate | 2021 |
| Ole-Martin Ellingsen AS | Health & social care | 2021 |
| Olseng Invest AS | Administrative & support | 2015 |
| Olseng Marina AS | Real estate | 2017 |
| Omni Holding AS | Real estate | 2014 |
| Omniprod AS | Wholesale & retail | 1982 |
| Omsorgsnett Ans | Information & communication | 2000 |
| Onprint AS | Professional & scientific | 2025 |
| Opplev Event AS | Administrative & support | 2022 |
| Optimal Sikkerhetssystemer AS | Administrative & support | 2012 |
| Opv 16 AS | Real estate | 2015 |
| Origo Holding AS | Real estate | 2000 |
| Ove Skår AS | Construction | 1989 |
| Ove Skår Eiendom AS | Real estate | 1995 |
| Ove Skår Gruppen AS | Construction | 2017 |
| P.M. Holding AS | Information & communication | 2020 |
| Padsport AS | Wholesale & retail | 2026 |
| Pankreas AS | Health & social care | 2017 |
| Parmann & Hagen AS | Health & social care | 2016 |
| Partnergruppen Eiendom AS | Real estate | 2017 |
| Pas Ingeniører AS | Professional & scientific | 2005 |
| Paulsrud Gruppen AS | Administrative & support | 2016 |
| Pedersen Eiendom AS | Real estate | 1980 |
| Pedersen Fargehandel AS | Wholesale & retail | 2019 |
| Pellygata 66 AS | Real estate | 2018 |
| Pellygata 72 AS | Real estate | 2021 |
| Pellygaten Autosenter AS | Other services | 1990 |
| Pengia AS | Wholesale & retail | 2019 |
| Pensjonsbeviset AS | Information & communication | 2013 |
| Peppermint Norge AS | Wholesale & retail | 1989 |
| Pepsar AS | Hospitality | 2014 |
| Per Klavestad Elektriske AS | | 1991 |
| Peroti Coaching AS | Education | 2026 |
| Pevo Invest AS | Real estate | 1974 |
| PF Montasje AS | Manufacturing | 2022 |
| PGK Invest AS | | 2015 |
| Philini Instituttet AS | Education | 2021 |
| Pima Invest AS | Real estate | 2017 |
| Pizzakebabhouse Da | Hospitality | 2019 |
| Play Active AS | Information & communication | 2022 |
| Plommen Frukt AS | Manufacturing | 2020 |
| Pluss Utvikling AS | Real estate | 2018 |
| Pluto Da | Professional & scientific | 2001 |
| PM Drift AS | Wholesale & retail | 2014 |
| Pmø Holding AS | Information & communication | 2018 |
| Poa Invest AS | Manufacturing | 2015 |
| Podcasten Støttepasning Da | Information & communication | 2025 |
| Pof Productions AS | Arts & recreation | 2015 |
| Poj Mekaniske AS | Manufacturing | 1999 |
| Polar Barge AS | Transport & logistics | 2021 |
| Polar Transport AS | Transport & logistics | 2013 |
| Polynom AS | Education | 2020 |
| Pp-Prosjekter Ans | Real estate | 2020 |
| Pre-Fab Invest AS | | 2026 |
| Premium Synskirurgi AS | Health & social care | 2025 |
| Pren Holding AS | Financial services | 2014 |
| Prestegaard Holding AS | Health & social care | 2021 |
| Profab Houses Nuf | Construction | 2016 |
| Profusion AS | Professional & scientific | 2016 |
| Progressive Invest 2 AS | Real estate | 2022 |
| Progressive Invest AS | Real estate | 2022 |
| Proleet Da | Information & communication | 2008 |
| Proly AS | Information & communication | 2025 |
| Propero AS | Real estate | 1995 |
| Prosjekt 33 AS | Construction | 2016 |
| Protakst AS | Professional & scientific | 1987 |
| Prozo Norge AS | Wholesale & retail | 2004 |
| Pyntlund Holding AS | Professional & scientific | 2023 |
| Pål H Bøhaugen AS | | 2005 |
| Pønt AS | Wholesale & retail | 2019 |
| Pøw Holding AS | | 2026 |
| QM Engineering AS | Professional & scientific | 2010 |
| Quick & Tony AS | | 2025 |
| Qvicklund AS | Wholesale & retail | 2017 |
| R-K Eiendom AS | Real estate | 2011 |
| R-L Holding AS | Financial services | 2015 |
| R. M. El Installasjon AS | Construction | 2009 |
| Ragnar Slorer AS | Real estate | 2005 |
| Ragnhild Guttormsen Frisør AS | Other services | 2022 |
| Ramdahl Eiendom AS | Real estate | 1983 |
| Rami Tahsin Holding AS | | 2025 |
| Ramini Invest AS | | 2024 |
| RC Båtservice AS | Manufacturing | 2023 |
| RCC Revisjon AS | Professional & scientific | 2023 |
| Reed & Mackay Norge AS | Administrative & support | 2012 |
| Refined AS | Information & communication | 2021 |
| Regnskapsboden AS | Professional & scientific | 2022 |
| Reinvestment AS | | 2022 |