| Potters Holding AS | Financial services | 2018 |
| Pow Holding AS | Professional & scientific | 2013 |
| Powertan Norway AS | Wholesale & retail | 2003 |
| Powertest AS | Wholesale & retail | 2018 |
| Powr Io AS | | 2024 |
| PPM Prosjekt AS | Professional & scientific | 2021 |
| PPM Prosjekt Trondheim AS | Professional & scientific | 2018 |
| PPM Robotics AS | Professional & scientific | 2000 |
| Pragmatech AS | Information & communication | 2024 |
| Praktica AS | Professional & scientific | 2020 |
| Praktisk Forretningshjelp AS | Professional & scientific | 2023 |
| Precor AS | Administrative & support | 2020 |
| Predichem AS | Information & communication | 1988 |
| Preg Barnehager Risvollan AS | Education | 2022 |
| Preg Åpen Barnehager AS | Education | 2022 |
| Prego Ristorante AS | Hospitality | 2012 |
| Preka Castrum AS | Real estate | 2021 |
| Premator Norge AS | Manufacturing | 2013 |
| Prepp AS | Information & communication | 2020 |
| President Holding AS | Financial services | 2017 |
| Pressofetor Invest AS | Real estate | 2016 |
| Prestegårdsjordet Barnehage SA | Education | 1963 |
| Presthus Holding AS | Arts & recreation | 2024 |
| Presthus Media AS | Arts & recreation | 2024 |
| Prestmo Bolig AS | Real estate | 2020 |
| Prestmo Spesialistlegesenter AS | Health & social care | 2015 |
| Pretor Advokat AS | Professional & scientific | 2008 |
| Previse Technologies AS | Information & communication | 2025 |
| Prewa AS | Real estate | 2019 |
| Primal AS | Wholesale & retail | 2021 |
| Primera Solutions AS | Professional & scientific | 2025 |
| Primitivo AS | Real estate | 2023 |
| Princeps Consulitng AS | Professional & scientific | 2024 |
| Princessa Industries AS | Professional & scientific | 2014 |
| Prinsen Eiendom AS | Real estate | 2024 |
| Prinsens GT. 51 AS | Real estate | 2018 |
| Prinsensgate 32 AS | Real estate | 2015 |
| PRINSENSGT.12 AS | Real estate | 2013 |
| Printit AS | Manufacturing | 2015 |
| Printo Profil AS | Professional & scientific | 2025 |
| Pripps Eiendom AS | Real estate | 2024 |
| Priscus AS | Professional & scientific | 1997 |
| Pritsberg Holding AS | | 2019 |
| Privat Trygg Omsorg AS | Administrative & support | 2020 |
| Pro C.H. Norge AS | Real estate | 2025 |
| Probabilistic AI Collective AS | Professional & scientific | 2025 |
| Prociedo AS | Information & communication | 2024 |
| Prodecs AS | Professional & scientific | 2024 |
| Proff Elektro AS | Construction | 2010 |
| Proff Maling & Gulv AS | Wholesale & retail | 2025 |
| Proff Property Services AS | Real estate | 2018 |
| Proff VVS AS | Construction | 2012 |
| Proffgruppen AS | Administrative & support | 2021 |
| Proffhund AS | Wholesale & retail | 2017 |
| Profftak Trøndelag AS | Construction | 2018 |
| Profi Mekatronikk Industri AS | Manufacturing | 1994 |
| Proficio AS | Professional & scientific | 2006 |
| Profittmaxconsulting AS | Hospitality | 2005 |
| Profix Bilverksted AS | Other services | 2000 |
| Proglab AS | Professional & scientific | 2015 |
| Promedica AS | | 2005 |
| Promolink Holding AS | Financial services | 2008 |
| Pronova Invest AS | | 1990 |
| Propan Senteret AS | Wholesale & retail | 2006 |
| Property AS | Real estate | 1995 |
| Prora Boligprosjekter AS | Real estate | 2013 |
| Prora Eiendom AS | Real estate | 1996 |
| Prora Invest AS | Real estate | 2014 |
| Prores AS | Professional & scientific | 2013 |
| Prorør AS | Construction | 2019 |
| Prosessutvikling AS | Professional & scientific | 2006 |
| Prosjektleder Arne Opsal AS | Professional & scientific | 2023 |
| Prospektor Invest AS | Hospitality | 2002 |
| Prosperi Thea Holding AS | | 2021 |
| Prosphere AS | Professional & scientific | 2014 |
| Protan Entreprenør Midt-Norge AS | Construction | 2014 |
| Protection Brannhemming AS | Professional & scientific | 1991 |
| Proteon AS | Information & communication | 2022 |
| Protese Consult AS | Health & social care | 2021 |
| Protext Holding AS | Information & communication | 2005 |
| Prothelma AS | Financial services | 2012 |
| Protolab AS | Professional & scientific | 2006 |
| Proveno AS | Professional & scientific | 2021 |
| Proventure Management II AS | Financial services | 2015 |
| Proventure Management III AS | Financial services | 2019 |
| Proventure Seed II AS | Financial services | 2014 |
| Proventure Seed III AS | Financial services | 2019 |
| Proverbio Gene Consult AS | Professional & scientific | 2025 |
| Provincen AS | Real estate | 2007 |
| Provins Eiendom AS | Real estate | 2020 |
| Provippe AS | Other services | 2025 |
| Prydz Interiør AS | Wholesale & retail | 1994 |
| Prærien Holding AS | Administrative & support | 2005 |
| Prøven Eiendom AS | Real estate | 1980 |
| PS Ascent AS | | 2024 |
| PS1 Holding AS | | 2006 |
| Pschjetne Invest AS | Professional & scientific | 2015 |
| Psi Pipeline Services International Group GmbH & Co.Kg | Professional & scientific | 2013 |
| Psit Software AS | Information & communication | 2018 |
| Pso Holding AS | | 2025 |