| Pstereo AS | Arts & recreation | 2007 |
| Psy Industries AS | Information & communication | 2017 |
| Psykolog Gro Beate Drege AS | Health & social care | 2013 |
| Psykologspesialist Einarson AS | Health & social care | 2024 |
| Psykologspesialist Trude Stokkan AS | Health & social care | 2017 |
| Psykomotorisk Fysioterapi Og Akupunktur AS | Health & social care | 1998 |
| Psykomotorisk Senter Da | | 2026 |
| Psynergico AS | Health & social care | 2022 |
| Ptg-Holding AS | Construction | 2011 |
| PTM Eiendom AS | | 2013 |
| Pu Holding AS | Professional & scientific | 2005 |
| Public Control Management AS | Administrative & support | 2002 |
| Puffi AS | Hospitality | 2026 |
| Puffinvest AS | | 2026 |
| Pukstad Formidling AS | Education | 2025 |
| Puls Eiendom AS | Real estate | 2002 |
| Puls Eiendom Bolig AS | Real estate | 2022 |
| Puls Røsslyngvegen AS | Real estate | 2008 |
| Pure Arctic Concept AS | Wholesale & retail | 2012 |
| Pure Management AS | Professional & scientific | 2025 |
| Pure Properties AS | Construction | 2017 |
| Push the Button AS | Professional & scientific | 2025 |
| Pust Og Puls AS | Education | 2022 |
| Pusterom AS | Real estate | 2005 |
| Puzzle Filmproduksjon AS | Information & communication | 2015 |
| Pvi AS | Real estate | 2005 |
| PW Music & Holding AS | Arts & recreation | 1996 |
| Pwentertainment AS | Professional & scientific | 2011 |
| PWH AS | Financial services | 2018 |
| Pwrecords AS | Information & communication | 2020 |
| PWS Eiendom AS | Real estate | 2021 |
| PWS Godhavn Utbygging AS | Real estate | 2022 |
| PWS Holding AS | Real estate | 2021 |
| PWS Private Equity AS | Real estate | 2023 |
| PWS Utvikling AS | Real estate | 2021 |
| Park og Anlegg A/S | Administrative & support | 1988 |
| På Vei AS | | 2026 |
| Pål Eidem Holding AS | Financial services | 2017 |
| Q Holding AS | Real estate | 2016 |
| Q Invest AS | Real estate | 2021 |
| Q-Free International AS | Real estate | 2006 |
| Q-Thera AS | | 2013 |
| Qani Partners AS | Financial services | 2024 |
| Qmed Norway AS | Professional & scientific | 2022 |
| Qondor AS | Professional & scientific | 2000 |
| QPD AS | Real estate | 2021 |
| Qsub AS | Information & communication | 2013 |
| Quad Geometrics Norway AS | Professional & scientific | 2013 |
| Quality Hotel Augustin AS | Hospitality | 1995 |
| Quality Product AS | Information & communication | 2026 |
| Quantbit AS | | 2025 |
| Quantis AS | Information & communication | 2025 |
| Quantum Leap Grow AS | Education | 2021 |
| Quark Holding AS | | 2024 |
| Quartz Technologies AS | | 2026 |
| Quatre AS | Real estate | 2010 |
| Queuey AS | Information & communication | 2026 |
| Queuey Holding AS | | 2026 |
| Quickvend AS | Wholesale & retail | 2026 |
| Quiri AS | Professional & scientific | 2023 |
| Quizkverna Da | Arts & recreation | 2021 |
| Quman Holding AS | | 2020 |
| Quod AS | Real estate | 2021 |
| Qureshi Holding AS | | 2024 |
| Qvingra AS | Real estate | 2013 |
| R Daaland AS | Manufacturing | 1980 |
| R Kjeldsberg AS | Real estate | 1994 |
| R Kjerringvåg AS | Real estate | 1980 |
| R-Star Barber Zere AS | Other services | 2024 |
| R. B. Wold Kunstformidling AS | Wholesale & retail | 2018 |
| R. E. Holding AS | | 2016 |
| R. Eli AS | Real estate | 2021 |
| R. Gjestad AS | Wholesale & retail | 2007 |
| R. Krogstad Holding AS | Financial services | 2012 |
| R.B.G AS | Hospitality | 2024 |
| R.C. Marthinsen Oppussing AS | Real estate | 2023 |
| R.G. Invest AS | | 2021 |
| R.S. Andersen AS | Professional & scientific | 2008 |
| R.T. Bygg Da | Construction | 2011 |
| Raaken Eiendom AS | Administrative & support | 2007 |
| Rabec AS | | 2024 |
| Rabona Invest AS | | 2025 |
| Racce AS | Professional & scientific | 1988 |
| Radiatorservice Trondheim AS | Manufacturing | 1996 |
| Radig AS | Transport & logistics | 2022 |
| Radikal AS | Hospitality | 2018 |
| Radin Invest AS | Real estate | 2001 |
| Radio City Shop Da | Wholesale & retail | 1991 |
| Radionerd AS | Professional & scientific | 2005 |
| Radionor Communications AS | Manufacturing | 2000 |
| Ragnar Nordvik Holding AS | | 2021 |
| Ragnarock Geo AS | Information & communication | 2018 |
| Ragnarok Film AS | Information & communication | 2017 |
| Ragnarok Holding AS | | 2025 |
| Ragnaråkk AS | Wholesale & retail | 2018 |
| Ragnhild Maske AS | | 2023 |
| Ragnhild Nordvik Holding AS | | 2024 |
| Ragnhildsg 1 AS | Households | 1951 |
| Rags Holding AS | | 2026 |
| Ragtag AS | Information & communication | 2022 |