| PD Import AS | Wholesale & retail | 2022 |
| Peca Eiendom AS | Real estate | 2007 |
| Pefon AS | Real estate | 2001 |
| Pemo Eiendom AS | Real estate | 1998 |
| Pengeboy AS | | 2024 |
| PEOPLE4YOU AS | Administrative & support | 2006 |
| PEOPLE4YOU Management Østfold-Follo AS | Administrative & support | 2016 |
| Pepask AS | Hospitality | 2016 |
| Pete AS | Information & communication | 2014 |
| Peter Bergströms Tivoli AS | Arts & recreation | 2006 |
| Petter Smart AS | Construction | 2019 |
| Ple Invest AS | Real estate | 2020 |
| PM Flex Nordic AB | Wholesale & retail | 2009 |
| Polaris Norway AS | Wholesale & retail | 2002 |
| Polaris Scandinavia AB Nuf | Wholesale & retail | 2003 |
| Polyfiber AS | Wholesale & retail | 1994 |
| Powersource AS | Professional & scientific | 2015 |
| Prido Norway AS | Construction | 2013 |
| Prikk AS | Professional & scientific | 2016 |
| Primebio Holding AS | Professional & scientific | 2021 |
| Proaid AS | Education | 2010 |
| Probably Quantum AS | | 2025 |
| Promoteq AS | Wholesale & retail | 2026 |
| Prosperum AS | Education | 2025 |
| Psga Nordic AS | Arts & recreation | 2025 |
| PT Investment Limited Nuf | | 2025 |
| Pumpe & Maskinteknikk AS | Wholesale & retail | 2024 |
| R/S Anleggsgartnerservice AS | Administrative & support | 2019 |
| R/S Holding AS | Administrative & support | 2012 |
| R13 Eiendom AS | Real estate | 2012 |
| Ra Transport AS | Construction | 2013 |
| Radiant Ecommerce AS | Wholesale & retail | 2023 |
| Rainbow Booking AS | Professional & scientific | 1997 |
| Rainbow Events AS | Administrative & support | 2002 |
| Rainbow Live AS | | 2025 |
| Rakkestadveien 128 AS | Real estate | 2011 |
| Rakkestadveien Eiendom AS | Real estate | 2003 |
| Ramberg Capital Invest AS | Real estate | 2024 |
| Ramberg Property Invest AS | Real estate | 2024 |
| Rask Eiendom AS | Real estate | 2014 |
| Raymonds Diner Askim AS | Hospitality | 2025 |
| RCC Regnskap AS | Professional & scientific | 2012 |
| Reklame & Ide AS | Professional & scientific | 1994 |
| Renfix AS | Real estate | 2012 |
| Rensenn AS | Real estate | 2019 |
| Reol Holding AS | Hospitality | 2024 |
| Resen-Fellie Eiendom AS | Real estate | 2024 |
| Respo Tilhenger AS | Wholesale & retail | 2015 |
| Resport AS | Information & communication | 2025 |
| Rett Invest AS | Real estate | 2000 |
| Retura Østfold AS | Water & waste | 2005 |
| Revida AS | Wholesale & retail | 2024 |
| Rhizomatic Holding AS | | 2026 |
| Ringo Askim AS | Wholesale & retail | 2009 |
| Ringsby AS | Real estate | 2009 |
| Ringvoll Næringspark AS | Real estate | 2024 |
| Rino Sydengen Holding AS | | 2021 |
| RKS Askim Holding AS | | 2024 |
| RKS Entreprenør AS | Construction | 2006 |
| RLM AS | Construction | 2007 |
| Rogaland Søppeltaxi AS | Transport & logistics | 2023 |
| Rosendal Eiendom AS | Wholesale & retail | 1997 |
| Rosendal Equipment AS | Administrative & support | 2023 |
| Rosendal Gruppen AS | Wholesale & retail | 2005 |
| Rosendal Maskin AS | Wholesale & retail | 1986 |
| Roy Davidsen Transport AS | Transport & logistics | 2024 |
| Rsrk Holding AS | | 2025 |
| RST Logistics AS | Transport & logistics | 2000 |
| RST Utvikling AS | Transport & logistics | 2005 |
| Rsu Invest AS | | 2021 |
| Ruby Dansestudio AS | Education | 2018 |
| Runar Sperstad Holding AS | Real estate | 2018 |
| Rune Høntorp Holding AS | | 2020 |
| Rune Teig AS | Real estate | 1982 |
| Rustad Planteskole Og Plantesenter AS | Agriculture & fishing | 2003 |
| Ryk Og Reis AS | Administrative & support | 1998 |
| Rådhusgata 23 Askim AS | Real estate | 2007 |
| Røko AS | Construction | 2023 |
| Rønningen Farm & Entreprenad AB | Construction | 2009 |
| Rørleggerservice Askim AS | Construction | 2015 |
| Rørvik Transport AS | Real estate | 2000 |
| S4SPORT AS | Wholesale & retail | 2024 |
| Saas AS | Information & communication | 2013 |
| Safetysec AS | Education | 2025 |
| Sagveien 17 AS | Real estate | 2010 |
| Sagveien 3 AS | Real estate | 2008 |
| Sagveien 9 AS | Real estate | 2021 |
| Sagveien Invest AS | Real estate | 2003 |
| Saka Invest AS | | 2026 |
| Saksesliperiet AS | Manufacturing | 2018 |
| Saleh Holding AS | Real estate | 2020 |
| Saleh Invest AS | Real estate | 2018 |
| Samak AS | Financial services | 2012 |
| Samurai AS | Wholesale & retail | 2005 |
| Sand Tredreieutstyr AS | Wholesale & retail | 2018 |
| Sanders Jobb Og Fritid AS | Wholesale & retail | 2020 |
| Sandvik Fysioterapi | Health & social care | 2013 |
| Sanico AS | Professional & scientific | 1978 |
| Sanoj AS | Real estate | 2005 |
| Sansa Service AS | Wholesale & retail | 2024 |