| Posteringen Holding AS | Construction | 2018 |
| Pre-Con AS | Construction | 2015 |
| Profftools AS | Wholesale & retail | 2014 |
| Progressum Kongsvinger AS | Professional & scientific | 1984 |
| Promenaden Kongsvinger AS | Health & social care | 1991 |
| Properx AS | Information & communication | 2022 |
| Prosjektråd Innlandet AS | Professional & scientific | 1991 |
| Puls Kongsvinger AS | Arts & recreation | 2010 |
| Puttara Fus Barnehage AS | Education | 2019 |
| PVP Eiendom AS | Construction | 2022 |
| Ragnhild Rimfeldt AS | Financial services | 2005 |
| Rast AS | Real estate | 2017 |
| Rasta Bil AS | Other services | 2013 |
| Rasta Eiendom AS | Real estate | 2020 |
| Rasta Glass AS | Construction | 1986 |
| Rasta Mat AS | Wholesale & retail | 1993 |
| Rasta Storkiosk AS | Wholesale & retail | 2001 |
| Rastavegen 1 AS | Real estate | 2013 |
| Ratatosk AS | Agriculture & fishing | 2015 |
| Raumnes Brygge AS | Real estate | 2000 |
| Rbe AS | Construction | 2014 |
| Re Jonassen Holding AS | | 2026 |
| Rebni AS | Health & social care | 2021 |
| Red Chillies Media AS | Arts & recreation | 2015 |
| Reidar Bråthen Invest AS | Financial services | 2005 |
| Reiser & Opplevelser AS | Administrative & support | 2005 |
| Remasawco AS | Wholesale & retail | 2003 |
| Reps Hus & Takst AS | Construction | 2024 |
| Respondo AS | | 2012 |
| Resultat Regnskap Holding AS | Professional & scientific | 2019 |
| Rett Partner AS | Administrative & support | 2021 |
| Retura Glåma AS | Water & waste | 2005 |
| Rimfeldt Eiendom AS | Real estate | 2006 |
| Rimfeldt Og Rimfeldt Ans | Professional & scientific | 2001 |
| Rimfeldt-Kvale AS | Real estate | 2013 |
| RJ Con AS | Professional & scientific | 2023 |
| Roax AS | Wholesale & retail | 2026 |
| Rocketspace AS | Professional & scientific | 2020 |
| Roger Heggeriset Transport AS | Transport & logistics | 2013 |
| Rolv Snare AS | Construction | 1982 |
| Romerike Armering Invest AS | Construction | 2022 |
| Rotberget Invest AS | | 2026 |
| Row-Plan AS | Professional & scientific | 2014 |
| Royal Salmon AS | Wholesale & retail | 2026 |
| RS Mobil Og IT AS | Wholesale & retail | 2004 |
| RTM Solutions AS | Real estate | 2025 |
| Rudshøgda Pukkverk AS | Mining & quarrying | 2012 |
| RUSILL&77 AS | Information & communication | 2019 |
| Rymoen Velvære AS | Health & social care | 2025 |
| Rådhusparken Skarnes AS | | 2021 |
| Rønning Gravedrift AS | Construction | 2014 |
| S.S Invest AS | Financial services | 2014 |
| Safe Økonomi AS | Professional & scientific | 1995 |
| Saga Dental Supply AS | Wholesale & retail | 1976 |
| Saghaug Holding AS | Real estate | 1990 |
| Sakinvest AS | | 2006 |
| Salgssupport AS | Financial services | 2009 |
| Salong Betty AS | Other services | 2003 |
| Salsus AS | Manufacturing | 2014 |
| Sandbekk Holding AS | Real estate | 2005 |
| Sandströms Gulvservice AS | Construction | 2009 |
| Schutz Nordic AS | Manufacturing | 1999 |
| Seas 3 AS | Wholesale & retail | 2018 |
| Sederholm International Ans | Transport & logistics | 2000 |
| Segway Norge AS | Wholesale & retail | 2013 |
| Servicon Group AS | Manufacturing | 2013 |
| Servicon Norway AS | Other services | 2009 |
| Siesta Utleie AS | Administrative & support | 2026 |
| Signatur Its AS | Professional & scientific | 2011 |
| Sikker Bane AS | Professional & scientific | 2012 |
| Siljan Rail AB | Construction | 2016 |
| Silje Løwe Koppel AS | Real estate | 2024 |
| Silva System AS | Wholesale & retail | 1991 |
| Sipow AS | Professional & scientific | 2021 |
| SJ Konsult AS | Wholesale & retail | 2024 |
| Skandinaviakrysset AS | Real estate | 2013 |
| Skap Resultater AS | Professional & scientific | 2013 |
| Skarstad AS | Agriculture & fishing | 2021 |
| Skedsmo Håndverk AS | Construction | 2018 |
| Skjeldsø AS | Real estate | 2005 |
| Skogen Kafferøsteri AS | Manufacturing | 2023 |
| Skolebakken 1 AS | Real estate | 2006 |
| Skyrud Eiendom AS | Wholesale & retail | 2014 |
| Skyrud Holding AS | Wholesale & retail | 2014 |
| Smak Av Thailand Ans | Hospitality | 2013 |
| Smartstore AS | Real estate | 2023 |
| Smartstore Eiendom AS | Real estate | 2026 |
| Smestadtjennet AS | Professional & scientific | 2020 |
| Snaresenteret AS | Real estate | 1976 |
| Snaresenteret Eiendom AS | Real estate | 2019 |
| Snø Og Utemiljø AS | Administrative & support | 2020 |
| Snøfritt AS | | 2026 |
| Sodanofoods AS | Hospitality | 2024 |
| Solvang Kongsvinger AS | Real estate | 2016 |
| Solør Edb AS | Wholesale & retail | 1987 |
| SP Essence AS | | 2025 |
| Spare AS | Wholesale & retail | 2004 |
| Spennteknikk Construction AS | Professional & scientific | 2012 |
| Spennteknikk International AS | Manufacturing | 2009 |
| Spetals Verk AS | Professional & scientific | 2025 |