| Plug-In Service AS | Construction | 2016 |
| PNN Invest AS | Real estate | 2005 |
| Postrom Maskiner AS | Wholesale & retail | 1989 |
| Premium Wines AS | Wholesale & retail | 2001 |
| Pro Bygg & Maskin AS | Construction | 2022 |
| Pro Systemer AS | Arts & recreation | 2024 |
| Promo Transport AS | Transport & logistics | 2018 |
| Prosess-Service AS | Manufacturing | 2023 |
| PS Assets AS | Administrative & support | 2026 |
| PS Holding AS | Arts & recreation | 2024 |
| Psgk Invest AS | | 2020 |
| Punchline Holding AS | | 2019 |
| Pål Arve Kleven Invest AS | Wholesale & retail | 2018 |
| Pål Kleven Dagligvare AS | Wholesale & retail | 2018 |
| Qubik AS | Arts & recreation | 2018 |
| Questigate AS | Information & communication | 2021 |
| Rbi Solar Energi AS | Wholesale & retail | 2023 |
| Redford Polymers Nuf | Professional & scientific | 2009 |
| Reimertz Interior AS | Professional & scientific | 2016 |
| Reinli Holding AS | Construction | 2025 |
| Relief Care AS | Health & social care | 2023 |
| Revisjon Consult AS | Professional & scientific | 2014 |
| Revisjonsselskapet Olsson & Co Da | Professional & scientific | 2009 |
| Ringnes Supply Company AS | Manufacturing | 2006 |
| Ringneshagan Eiendomsutvikling AS | Real estate | 2024 |
| RKH Holding AS | | 2020 |
| Romerike Kaffebrenneri AS | Manufacturing | 2025 |
| Romerike Renhold Og Vedlikeholdsservice AS | Administrative & support | 2026 |
| Rosing Eiendom AS | Real estate | 1972 |
| Rosing's Holding AS | Construction | 2005 |
| Rosings Industrier AS | Construction | 1987 |
| Rosmek AS | Manufacturing | 2003 |
| Rostad Consulting AS | Professional & scientific | 2017 |
| Royal Bilvask Og Pizza AS | Other services | 2026 |
| Rubicon AS | Wholesale & retail | 2000 |
| Run the Voltage AS | Other services | 2025 |
| Rune Grøvslien Transport AS | Transport & logistics | 1998 |
| Rød Boligutvikling AS | Real estate | 2011 |
| Rørmiljø AS | Administrative & support | 1978 |
| S.Robøle Holding AS | Professional & scientific | 2026 |
| Salmonordic Seafood AS | Wholesale & retail | 2024 |
| Samosa Chai AS | Hospitality | 2024 |
| Sancus AS | Professional & scientific | 2017 |
| Sandberg Regnskap AS | Professional & scientific | 2009 |
| Sari Service AS | Transport & logistics | 2017 |
| SB Equity AS | | 2025 |
| Scaniabiz AS | Administrative & support | 2014 |
| Scheie Invest Holding AS | Real estate | 2017 |
| Schürmann Holding AS | | 2019 |
| Scott & Green AS | Wholesale & retail | 2024 |
| Selley AS | Professional & scientific | 2019 |
| Selmatec AS | Wholesale & retail | 2002 |
| Senevi Drift AS | Wholesale & retail | 2020 |
| Senfina AS | Wholesale & retail | 1999 |
| Sentralkommandoen AS | Information & communication | 2017 |
| Servika AS | Transport & logistics | 2025 |
| Servis 1 AS | Administrative & support | 2018 |
| Sheikh Holding AS | | 2020 |
| Si Transport AS | Transport & logistics | 2018 |
| Siemers & Cos Destillasjon Ans | Manufacturing | 2000 |
| Sikker Eiendom AS | Real estate | 2006 |
| Simensen Holding AS | | 2016 |
| Simensen Rustfri AS | Manufacturing | 1988 |
| Site Service AS | Construction | 2011 |
| Site Service Holding AS | Financial services | 2016 |
| Sivbo Systems AS | Information & communication | 2015 |
| Sj-Invest AS | Real estate | 2021 |
| Sjøveien 8 AS | Real estate | 2019 |
| SK Skrenten Invest AS | | 2024 |
| Skanditek AS | Professional & scientific | 2015 |
| Skiftetjenester AS | Construction | 2015 |
| Skiftetjenester Nytt AS | Transport & logistics | 2026 |
| Skillebekk Invest AS | Professional & scientific | 2018 |
| Skillebekk Regnskap AS | Professional & scientific | 2015 |
| Skillebekk Snekker AS | Construction | 2024 |
| Skins Originals AS | Wholesale & retail | 2025 |
| Skoveng Prosjekt AS | Construction | 2023 |
| Skrenten Nor Holding AS | Wholesale & retail | 2024 |
| Skybit Norge AS | Real estate | 2020 |
| Skyscraper AS | | 2017 |
| Skytta Catering Tran AS | Hospitality | 2021 |
| Skytta Eiendom AS | Real estate | 1979 |
| Skytta Hydroforanlegg SA | Water & waste | 1947 |
| Skytta Nor AS | Real estate | 1985 |
| Skytta Nor Holding AS | Wholesale & retail | 2004 |
| Skøien Invest AS | | 2020 |
| Smith Invest AS | Real estate | 2018 |
| Solstua Barnehage AS | Education | 2014 |
| Soulgrowth AS | Education | 2024 |
| Spn-Holding AS | | 2024 |
| Sponsor Og Mediasalg AS | Professional & scientific | 2016 |
| Sponsored by Uncle AS | Real estate | 2005 |
| Ssangyong Norge AS | Wholesale & retail | 1985 |
| ST Bygg Og Graveservice AS | Construction | 2014 |
| Stams Invest AS | | 2020 |
| Stamveien 7 AS | Real estate | 2020 |
| Star Bidco AS | Construction | 2022 |
| Sten Ørpen AS | Real estate | 2004 |
| Stendebakken AS | Real estate | 2015 |
| Stenelind Holding AS | Wholesale & retail | 2024 |