| Pilot & Aviation Support Ltd Nuf | Administrative & support | 2018 |
| Pitha Holding AS | | 2025 |
| PJT Eiendom AS | Real estate | 2022 |
| Platon Prosjektutvikling AS | Real estate | 2005 |
| Plutus Eiendom AS | Real estate | 2025 |
| Polyteknikk AS | Professional & scientific | 2007 |
| Ponova AS | Wholesale & retail | 2023 |
| Portal Eiendomsinvest AS | Real estate | 2013 |
| Primahus Byggservice AS | Construction | 1999 |
| Primahus Eiendom AS | Real estate | 2003 |
| Profftelt AS | Wholesale & retail | 2016 |
| Promax AS | Professional & scientific | 2014 |
| Promex Helse AS | Wholesale & retail | 2000 |
| Proxo AS | Information & communication | 2011 |
| Proxo Regnskap AS | Professional & scientific | 2020 |
| Psykolog Trond Haug AS | Health & social care | 2002 |
| Pulspadel Stjørdal AS | Arts & recreation | 2005 |
| Pure Surfaces AS | Construction | 2012 |
| Pvi Holding 2 AS | | 2025 |
| Pvi Holding AS | Real estate | 2014 |
| Pynt Til Fest AS | Wholesale & retail | 2012 |
| Pytagoras AS | Financial services | 2017 |
| Quality Airport Hotel Værnes AS | Hospitality | 1989 |
| Quick Invest AS | Real estate | 2019 |
| Radio Trøndelag SA | Information & communication | 2002 |
| Radonspesialisten Trondheim AS | Professional & scientific | 2020 |
| Ragnhilds Hjemmebakeri Jakobsen AS | Manufacturing | 2021 |
| Randex AS | Wholesale & retail | 2012 |
| Rapid Rappel AS | Professional & scientific | 2020 |
| Rapid Rappel Technology AS | Wholesale & retail | 2016 |
| Ravlo Invest AS | Real estate | 2011 |
| Rawgym Stjørdal AS | Arts & recreation | 2025 |
| Rawi AS | Wholesale & retail | 2014 |
| RCB AS | Wholesale & retail | 2023 |
| Ree Gård Da | Real estate | 2022 |
| Ree Utvikling AS | Real estate | 2012 |
| Reklamebanken AS | Professional & scientific | 2011 |
| Reklamecompagniet Da | Professional & scientific | 1996 |
| Rely AS | Wholesale & retail | 2001 |
| Remyra Grende- Og Klubbhus Ba | Real estate | 1985 |
| Remyra Torvlag SA | Real estate | 1943 |
| Repe Holding AS | | 2020 |
| Reppa Eiendom AS | Real estate | 2026 |
| Resan AS | Construction | 2015 |
| Rett Spor AS | Health & social care | 2022 |
| Rettep Holding AS | Financial services | 2009 |
| Retushit AS | Professional & scientific | 2022 |
| RF Bilsalg AS | Wholesale & retail | 2013 |
| Ringbanen 1 AS | Real estate | 2025 |
| Ringbanen AS | Real estate | 2022 |
| RLH Future AS | Professional & scientific | 2026 |
| RLH Invest AS | | 2018 |
| Roberts Sko & Nøkkelservice AS | Other services | 2002 |
| Rokke Consult AS | Professional & scientific | 2013 |
| Romy Clima AS | Professional & scientific | 2015 |
| Rosa AS | Information & communication | 2026 |
| Rota Eiendom AS | Administrative & support | 2002 |
| Royalty AS | Other services | 2023 |
| RTV Holding AS | | 2025 |
| Ruccola AS | Hospitality | 2021 |
| Runar Balstad Holding AS | | 2021 |
| Rå Boligstyling V. Line Woldmo AS | Professional & scientific | 2024 |
| Rødsjøen Eiendom AS | Real estate | 2019 |
| Rørleggertjenester AS | Construction | 2022 |
| Røros Eiendom AS | Real estate | 2014 |
| Rørteknikk AS | Construction | 2001 |
| Røskaft Kjøkken & Interiør Stjørdal AS | Wholesale & retail | 2009 |
| S Rønsåsbjørg AS | Transport & logistics | 2014 |
| S. Berg Invest AS | Financial services | 2008 |
| S. E. Vold AS | | 2021 |
| S. Fjellstad Holding AS | | 2021 |
| S.A.K. AS | Professional & scientific | 2007 |
| Sabrura Stjørdal AS | Hospitality | 2017 |
| Safe Solutions AS | Manufacturing | 2013 |
| Saga Eiendomsselskap AS | Real estate | 2024 |
| Sagatun Barnehage AS | Education | 2017 |
| Sakshaug Holding AS | Real estate | 2015 |
| Sakshaug Sport Torgkvartalet AS | Wholesale & retail | 1995 |
| Salberg Trafikkskole AS | Education | 2010 |
| Salong Frøken Strøken AS | Other services | 2023 |
| Saltøya AS | Real estate | 2014 |
| Samå Holding AS | | 2014 |
| Sand Multiservice AS | Wholesale & retail | 2024 |
| Sandfærhus Bilpleie AS | Other services | 2007 |
| Sandfærhus Eiendom AS | Real estate | 2019 |
| Sandfærhus Holding AS | Real estate | 2012 |
| Sandfærhus Næringspark AS | Real estate | 1998 |
| Sandfærhus Parkering AS | Transport & logistics | 2014 |
| Sandfærhus Topco AS | | 2026 |
| Saxa Hårstudio AS | Other services | 2013 |
| Scenario Beredskap AS | Health & social care | 2021 |
| Sekstisyv to AS | Real estate | 2022 |
| Sel Invest AS | Financial services | 2017 |
| Sellibakken Snekkeri AS | Construction | 2020 |
| Selliseth & Welde AS | Professional & scientific | 2007 |
| Selskapsshop.No AS | Wholesale & retail | 2009 |
| Senob AS | Real estate | 2005 |
| Serenity Capital AS | | 2026 |
| Service Trans AS | Transport & logistics | 2021 |
| Sesa Holding AS | | 2024 |