| Perfect Plate AS | Hospitality | 2024 |
| PEROTIS3KASSER AS | Construction | 2024 |
| Personsikkerhet AS | Administrative & support | 2025 |
| Pettersen-Utleie AS | Administrative & support | 2023 |
| Pikewallis Friluftsliv AS | Wholesale & retail | 2016 |
| Pioneer Utvikling AS | Professional & scientific | 2025 |
| Pizzakjeller'N Da | Hospitality | 1996 |
| Plannova AS | Professional & scientific | 2025 |
| Pluss Partner Da | Construction | 2016 |
| PN Tjenester AS | Wholesale & retail | 2017 |
| Pompano AS | Real estate | 2008 |
| Portmeister AS | Professional & scientific | 2025 |
| Portmeister Invest Limited Nuf | | 2025 |
| Princess Invest AS | Construction | 2024 |
| Princess Nails & Beauty AS | Other services | 2022 |
| Proexec AS | Information & communication | 2024 |
| Project Analytica AS | Professional & scientific | 2020 |
| Pure Rent AS | Administrative & support | 2024 |
| R Trade AS | Wholesale & retail | 2014 |
| Radiocompaniet AS | Manufacturing | 1984 |
| Radix Holding AS | | 2019 |
| RC Bilen AS | Wholesale & retail | 2020 |
| RC Industri & Byggservice AS | Manufacturing | 2019 |
| Redesign Project AS | Construction | 2018 |
| Relio AS | Information & communication | 2023 |
| Reofin AS | Professional & scientific | 2021 |
| Reofin Vekst AS | Real estate | 2024 |
| Rett I Saksa Da | Other services | 1993 |
| Rhabdo AS | Arts & recreation | 2019 |
| Rimereit Invest AS | Information & communication | 2023 |
| RN Bygg & Vedlikehold AS | Construction | 2023 |
| Roger Linnerud AS | Professional & scientific | 2013 |
| Rolf Eirik Larssen AS | | 2005 |
| Rollform AS | Manufacturing | 1994 |
| Romerike Eiendomsutvikling AS | Real estate | 1997 |
| Romerike Holding AS | Construction | 2022 |
| Romerike Industriservice AS | Manufacturing | 2020 |
| Romerike Silke Og Tekstiltrykk AS | Manufacturing | 1998 |
| Romstad Holding AS | Real estate | 2015 |
| Rosengården Bygg & Innredning AS | Construction | 2005 |
| Roven Pizza AS | Hospitality | 2017 |
| RPV AS | Wholesale & retail | 2008 |
| Rundbråten Mekaniske AS | Manufacturing | 2020 |
| Rosenberg Eiendom AS | | 1978 |
| S&B Invest AS | Professional & scientific | 2023 |
| S-A Eiendom AS | Real estate | 2005 |
| S-Gruppen 1 AS | Construction | 2024 |
| Sandbanken Invest AS | | 2022 |
| Sanitær - Varme AS | Construction | 1976 |
| Sapea AS | Arts & recreation | 2025 |
| Sar-Tech Holding AS | Real estate | 2020 |
| Sauna Magazine AS | Professional & scientific | 2025 |
| SC Stavdal AS | Administrative & support | 2022 |
| Schwung Invest AS | | 2022 |
| Schønningsen Holding AS | | 2023 |
| SDL Invest AS | | 2024 |
| SG Boligbygg AS | Real estate | 2022 |
| Shares Spectre Holding AS | | 2024 |
| Si Osl 03.1 AS | Information & communication | 2013 |
| Si Osl 03.2 AS | Information & communication | 2017 |
| Si-Ma AS | Real estate | 2022 |
| Signifika AS | Professional & scientific | 2026 |
| Sikrer AS | Professional & scientific | 2015 |
| Simonsen Stasjonssdrift AS | Wholesale & retail | 2019 |
| Sins AS | Construction | 2016 |
| Siram AS | Real estate | 1998 |
| Sjensen Holding AS | | 2023 |
| Skaarer AS | Construction | 2013 |
| Skadedyr Proffen AS | Administrative & support | 2023 |
| Skanska Nordic AS | Construction | 2021 |
| Skarenget Eie AS | Financial services | 2017 |
| Skedsmo Næringsbygg Ans | Real estate | 1987 |
| Skeikampen Holding AS | | 2018 |
| Skeikampen Invest AS | | 2018 |
| Skrondal Invest AS | Financial services | 2015 |
| Skårhaug Utvikling AS | | 2025 |
| Slorafoss Krantransport AS | Transport & logistics | 2022 |
| Slåtten Holding AS | Construction | 2021 |
| Smale Utleie AS | Real estate | 2014 |
| Smilsenteret AS | Health & social care | 2023 |
| Smoft AS | Information & communication | 2023 |
| Småtjern- Og Ravnåsveien SA | Real estate | 2022 |
| Softtech Consulting AS | Information & communication | 1997 |
| Solberg Eiendom & Invest AS | Construction | 2005 |
| Solg Invest AS | | 2025 |
| Solid Sikring AS | Construction | 2022 |
| Solidweb AS | Information & communication | 2023 |
| Solli Plass Servicesenter AS | Wholesale & retail | 1995 |
| Solvendt Eiendom AS | Real estate | 2016 |
| Sommerly Barnehage SA | Education | 1991 |
| Spectre Alliance AS | Arts & recreation | 2013 |
| Spectre Assets AS | Administrative & support | 2020 |
| Speed Cab Taxi AS | Transport & logistics | 2026 |
| Sport-Event AS | Administrative & support | 2018 |
| Sportxpert AS | Information & communication | 2014 |
| Spydevold-Konsult Invest | | 2017 |
| Spydevold-Konsult Nuf | Professional & scientific | 2017 |
| Stabburet Invest AS | Real estate | 2018 |
| Stackr AS | Information & communication | 2026 |
| Standard Autoco AS | Wholesale & retail | 2012 |