| Petter Myhre Invest AS | Education | 2014 |
| Petter Storm Olsen Holding AS | Administrative & support | 2009 |
| Phoenix Norwegian Holding AS | Real estate | 2012 |
| Pilula Holding AS | | 2025 |
| Pizza Italiano AS | Manufacturing | 2024 |
| PIZZAPÅ123 AS | Hospitality | 2017 |
| Pizzeria Trattoria Roma Ksu AS | Hospitality | 2014 |
| Plantehallen AS | Wholesale & retail | 2021 |
| Plastergrossisten AS | Wholesale & retail | 2020 |
| Plus Manuellterapi & Trening AS | Health & social care | 2003 |
| PMM Commercial Consulting Company AS | Wholesale & retail | 1997 |
| Po Holding AS | | 2025 |
| Polyvek AS | Financial services | 2024 |
| Portland AS | Wholesale & retail | 2014 |
| Portland Medical AS | Wholesale & retail | 2020 |
| Portland Scandinavia AS | Wholesale & retail | 2025 |
| Posterum AS | | 2023 |
| Power International AS | Wholesale & retail | 1989 |
| Power Norge AS | Wholesale & retail | 1996 |
| Power Services AS | Wholesale & retail | 2022 |
| Powergroup AS | Transport & logistics | 2017 |
| PP Penta Ans | Information & communication | 2004 |
| Precision Detailing AS | Other services | 2025 |
| Prinsdal Malerteam AS | Construction | 2014 |
| Print Team AS | Manufacturing | 1981 |
| Pro Auto Market No Nuf | Wholesale & retail | 2023 |
| Pro-Line Regnskap AS | Professional & scientific | 1990 |
| Probao AS | Administrative & support | 2000 |
| Proff Bilpleie AS | Other services | 2014 |
| Progressum AS | Professional & scientific | 2005 |
| Prontor Invest AS | Information & communication | 2013 |
| Protak Da | Construction | 2005 |
| Psykiater C.G Søgaard AS | Health & social care | 2013 |
| Psykolog Ingolf Fosse AS | Health & social care | 2006 |
| Psykolog Linda Smedstad AS | Health & social care | 2018 |
| Pumpe-Service AS | Wholesale & retail | 1978 |
| Purchase Solutions AS | Professional & scientific | 2012 |
| Pure Future Lab AS | Administrative & support | 2011 |
| Pure Investments AS | Real estate | 2023 |
| Purple Holding AS | | 2022 |
| Pyntpynt AS | Wholesale & retail | 2026 |
| Quadient Finance Norge AS | Administrative & support | 2010 |
| Quadient Norge AS | Wholesale & retail | 2003 |
| Quality Spas Nordic AS | Construction | 1997 |
| Quietpod Scandinavia AS | Manufacturing | 2021 |
| Quy'Sfrisør & Negledesign AS | Other services | 1995 |
| R. Stahl Scandinavia AS | Wholesale & retail | 2023 |
| Ra Properties AS | Real estate | 1994 |
| Ra Proton AS | Real estate | 2019 |
| Ra Service AS | Real estate | 2005 |
| Rabana Foto AS | Professional & scientific | 2024 |
| Ragn Sells AS | Water & waste | 1989 |
| Ragn-Sells AB | Water & waste | 2007 |
| Ragn-Sells Autoparts AS | Water & waste | 2014 |
| Ragro AS | Wholesale & retail | 1971 |
| Rajathurai AS | | 2026 |
| Ramma Bygg AS | Construction | 2019 |
| Ranjha AS | Hospitality | 2026 |
| Rask Hjelp AS | Administrative & support | 2026 |
| Rasta AS | Information & communication | 1981 |
| Rats Transport AS | Transport & logistics | 2020 |
| Real Mur Og Puss Ans | Construction | 2000 |
| Rebrahimi Holding AS | | 2023 |
| Reflex Barcom AS | Wholesale & retail | 1994 |
| Refsum AS | | 2021 |
| Regem Eiendom AS | Real estate | 2022 |
| Registrert Revisor Grete Maltby AS | Professional & scientific | 1998 |
| Rein by W AS | Wholesale & retail | 2023 |
| Released AS | Professional & scientific | 2017 |
| Ren Grunn AS | Real estate | 2012 |
| Rent a Tent Partyservice AS | Administrative & support | 2014 |
| Rent a Tent Utleie AS | Information & communication | 2015 |
| Retoma AS | Information & communication | 1998 |
| Retur Næring AS | Water & waste | 2018 |
| Revisjonssenteret AS | Professional & scientific | 2009 |
| RF Rør AS | Construction | 2020 |
| RG Gruppen AS | Construction | 2019 |
| Ricmar AS | Wholesale & retail | 2021 |
| Rist Holding AS | Financial services | 2006 |
| RK Montasje Og Services AS | Construction | 2026 |
| Ro&Stille AS | Wholesale & retail | 2012 |
| Roger Rør AS | Construction | 2018 |
| Rol Norway AS | Professional & scientific | 2026 |
| Roland Carlberg Processystem AS | Professional & scientific | 1989 |
| Rollshaper Studio Lørenskog AS | Other services | 2019 |
| Romerike Trelast AS | Wholesale & retail | 2025 |
| Romerike Urologisk Senter AS | Health & social care | 2018 |
| Rosenbergservice AS | Construction | 2021 |
| Roterud Holding AS | | 2021 |
| Rozana AS | Hospitality | 2025 |
| RR Transport AS | Transport & logistics | 2019 |
| RSN Elektrikern AS | Construction | 2018 |
| Russestickers.No AS | Wholesale & retail | 2024 |
| Rusta Retail AS | Wholesale & retail | 2013 |
| RV Bobil AS | Administrative & support | 2021 |
| Ryge Holding AS | | 2020 |
| Rygge Terrasse AS | Real estate | 2019 |
| RZ Tjenester AS | Construction | 2024 |
| Rønning Bygg & Vedlikehold AS | Construction | 2016 |
| Rørtek VVS & Bygg AS | Construction | 2026 |