| Pings Holding AS | | 2019 |
| Pinto AS | | 2005 |
| Pioner Finans AS | Administrative & support | 2021 |
| Pir 2 Eiendom AS | Real estate | 1997 |
| Pir II Grønn AS | Professional & scientific | 2019 |
| Pir II Holding AS | Professional & scientific | 2018 |
| Pir II Plan AS | Professional & scientific | 2005 |
| Pir Invest Holding AS | Real estate | 2005 |
| Pir Management AS | Real estate | 2005 |
| PIR2 AS | Professional & scientific | 2010 |
| Piranema L.L.C. Nuf | Mining & quarrying | 2021 |
| Piranema Production AS | Mining & quarrying | 2003 |
| Pirbadet Fysioterapi Da | Health & social care | 2001 |
| Pirsenteret AS | Real estate | 2012 |
| Pirsenteret Drift AS | Real estate | 2013 |
| Piscada AS | Information & communication | 2009 |
| Piscada Software AS | Information & communication | 2022 |
| Pisces Holding AS | Financial services | 2016 |
| Pitch Black Star Spangled AS | Arts & recreation | 2011 |
| Pitch Black Star Spangled Live AS | Arts & recreation | 2019 |
| Pixel AS | Information & communication | 2011 |
| Pizza Roma Trondheim AS | Hospitality | 2012 |
| Pizzaro Pizza & Grill AS | Hospitality | 2021 |
| Pjalt Holding AS | | 2024 |
| PK Agentur AS | Wholesale & retail | 2020 |
| PK Boligutvikling AS | Real estate | 2019 |
| Pka Arkitekter AS | Professional & scientific | 1985 |
| Pka Consulting AS | Professional & scientific | 2011 |
| Pkhei 848 Holding AS | | 2023 |
| PKN AS | Real estate | 2019 |
| Placewise Group AS | Information & communication | 2000 |
| Plan Arkitekter AS | Professional & scientific | 1996 |
| Planet Auto AS | Other services | 2026 |
| Planethifi AS | Wholesale & retail | 2009 |
| Plankfonds AS | | 2013 |
| Planktonic AS | Manufacturing | 2008 |
| Planløsninger AS | Professional & scientific | 2024 |
| Plansmia AS | Professional & scientific | 2011 |
| Plassapp AS | Information & communication | 2026 |
| Plassen Holding AS | | 2020 |
| Plasteriet AS | Manufacturing | 2022 |
| Plastikk AS | Health & social care | 2021 |
| Playakaan Holding AS | | 2024 |
| Playmakerne AS | Education | 2016 |
| Plenum Trondheim AS | Professional & scientific | 1991 |
| PLM Solutions AS | Information & communication | 2006 |
| PLN Eiendom AS | Real estate | 2005 |
| Plog Holding AS | Real estate | 2023 |
| Plorea Holding AS | Information & communication | 2019 |
| Pluss 1 Regnskap AS | Professional & scientific | 2012 |
| Plutte Berg Holding AS | | 2017 |
| Plyng Holding AS | | 2025 |
| Pmax Invest AS | Financial services | 2019 |
| PMR Holding AS | Hospitality | 2024 |
| Pmtec AS | Other services | 2025 |
| Poa Ressurs AS | Construction | 2026 |
| Poc Gourmet AS | Hospitality | 2023 |
| Poi AS | Financial services | 2015 |
| Pok Holding AS | Professional & scientific | 2012 |
| Pokestore AS | Wholesale & retail | 2021 |
| Pokékort AS | Wholesale & retail | 2025 |
| Polar Artist AS | Arts & recreation | 2006 |
| Polar Bear Coffee Roasters AS | Manufacturing | 2017 |
| Polar Clamps AS | Wholesale & retail | 1995 |
| Polar Holding AS | Real estate | 2011 |
| Polar Pel AS | Construction | 1994 |
| Polarbygg Trondheim AS | Construction | 2018 |
| Polaris Invest AS | Financial services | 2007 |
| Polaris Media ASA | Information & communication | 2008 |
| Polaris Media Midt-Norge AS | Information & communication | 2008 |
| Polaris Media Midt-Norge Salg AS | Information & communication | 1999 |
| Polaris Media Øst AS | Information & communication | 2024 |
| Polaris Regnskap AS | Professional & scientific | 2012 |
| Polarlys Innovation AS | Real estate | 2018 |
| Polarstone Holding AS | | 2026 |
| Poleshop.No AS | Wholesale & retail | 2024 |
| Polhøgda Eiendom AS | Real estate | 2006 |
| Polygraf Forlag AS | Arts & recreation | 2002 |
| Polyphase AS | | 2023 |
| Pom Invest AS | Professional & scientific | 2007 |
| Pomacon AS | Professional & scientific | 2023 |
| Pomo AS | | 2024 |
| Pompette Da | Hospitality | 2023 |
| Ponte Eiendom AS | Real estate | 2005 |
| Popcon AS | | 2024 |
| Popeye Technology AS | Professional & scientific | 2025 |
| Porsgrunnsveien 5-7 AS | Real estate | 2010 |
| Porthuset AS | Real estate | 2009 |
| Porto Santo Naturprodukter | Wholesale & retail | 2005 |
| Pose AS | | 2019 |
| Poseidon Holding AS | Information & communication | 1988 |
| Poseidon Simulation AS | Information & communication | 1994 |
| Posh Frisør AS | Other services | 2017 |
| Posisjon AS | Professional & scientific | 1999 |
| Posten Moderne AS | Arts & recreation | 2020 |
| Posterteam AS | Wholesale & retail | 2015 |
| Postholm Holding AS | Financial services | 2014 |
| Postitplan AS | Information & communication | 2018 |
| Poteito Potato AS | | 2019 |
| Pottemaker AS | Manufacturing | 2023 |