| RC Depot Norway AS | Wholesale & retail | 2020 |
| Realcom AS | Information & communication | 2012 |
| Regnskapsverden AS | Professional & scientific | 2024 |
| Ren & Fin AS | Administrative & support | 2018 |
| Renhold Teresa AS | Administrative & support | 2021 |
| Reservedel AS | Wholesale & retail | 2012 |
| Riggpartner AS | Administrative & support | 2014 |
| Rimfax AS | Professional & scientific | 2026 |
| Ringo Leker Skedsmo AS | Wholesale & retail | 2017 |
| Rismyhr Haugen AS | Financial services | 2016 |
| Ritas Vaskeservice AS | Administrative & support | 2012 |
| Riv Og Røsk AS | Construction | 2022 |
| RMB- AS | Construction | 2012 |
| Rmy AS | Education | 2025 |
| Road Safety Group AS | Transport & logistics | 2023 |
| Roar Johansen Eiendom AS | Real estate | 2013 |
| Rodin & Co AS | Wholesale & retail | 1998 |
| Roisjela AS | Real estate | 2008 |
| Rokom AS | Wholesale & retail | 2008 |
| Rolf Øines AS | Health & social care | 2000 |
| Rolfs Holding AS | | 2005 |
| Roma Kald-Drikk Roy Fjellvang AS | Wholesale & retail | 1997 |
| Romerike Barnehage - Solhaug AS | Education | 2022 |
| Romerike Barnehage - Varden AS | Education | 2022 |
| Romerike Barnehager SA | Education | 1996 |
| Romerike Brensel AS | Transport & logistics | 2025 |
| Romerike Dekk AS | Wholesale & retail | 2010 |
| Romerike Eiendom AS | Real estate | 2026 |
| Romerike Fyrverkeri AS | Wholesale & retail | 2025 |
| Romerike Portservice AS | Construction | 2026 |
| Rototilt AS | Wholesale & retail | 2014 |
| Rouge Costume AS | Wholesale & retail | 2026 |
| Rouge Holding AS | | 2026 |
| Royal Software AS | Information & communication | 2012 |
| RS3 Holding AS | Real estate | 2022 |
| Rydland Eiendom AS | Real estate | 2007 |
| Rørfag-Norge AS | Education | 2026 |
| Rørprosjekt AS | Construction | 2008 |
| Safesec AS | Wholesale & retail | 2015 |
| Safir Velvære AS | | 2026 |
| Saga Restaurant Ans | Hospitality | 1991 |
| Salas AS | | 2018 |
| San's AS | Hospitality | 2025 |
| Sano Holding AS | | 2022 |
| Santax Medico AS | Wholesale & retail | 1989 |
| Saver AS | Information & communication | 2020 |
| Saveti Rør AS | Construction | 2026 |
| Sbbm Holding AS | Real estate | 2018 |
| Scalibra AS | Professional & scientific | 2005 |
| Scan-Trans AS | Transport & logistics | 2018 |
| Scandinavian Solutions AS | Education | 2015 |
| Scanlog AS | Transport & logistics | 2022 |
| Scientific Nutrition AS | Manufacturing | 2021 |
| Seadex AS | Information & communication | 2013 |
| Seby AS | Construction | 1988 |
| Seko Elektro AS | Construction | 1992 |
| Selboe Group AS | Wholesale & retail | 2017 |
| Sensec Solutions AS | Wholesale & retail | 2006 |
| Sesamo Holding AS | Real estate | 2022 |
| Sherwin-Williams Norway AS | Manufacturing | 1975 |
| Silje Hallås AS | | 2021 |
| Siri Mette Herrem Holding AS | | 2025 |
| Skade Og Tilstand AS | Professional & scientific | 2024 |
| Skap Fremtid AS | Information & communication | 2019 |
| Skap Fremtid Eiendom AS | Real estate | 2023 |
| Skape Entreprenør AS | Construction | 2010 |
| Skedsmo Anlegg AS | Construction | 2020 |
| Skedsmo Anlegg Og Betong AS | Construction | 2026 |
| Skedsmo Auto Care AS | Other services | 2018 |
| Skedsmo Barnehager SA | Education | 1989 |
| Skedsmo Betong AS | Manufacturing | 2004 |
| Skedsmo Betong Eiendom AS | Real estate | 2018 |
| Skedsmo Billakkering AS | Other services | 2012 |
| Skedsmo Bygg Og Boligmaling AS | Construction | 2005 |
| Skedsmo Cleanteam AS | Administrative & support | 2023 |
| Skedsmo Eiendomsmegling AS | Real estate | 2011 |
| Skedsmo Entreprenør AS | Construction | 2019 |
| Skedsmo Functional Fitness AS | Education | 2020 |
| Skedsmo Group AS | | 2026 |
| Skedsmo Laserklinikk AS | Health & social care | 2024 |
| Skedsmo Medisinske Senter AS | Health & social care | 1996 |
| Skedsmo Psykologklinikk AS | Health & social care | 2024 |
| Skedsmo Regnskap AS | Professional & scientific | 1986 |
| Skedsmo Rørservice AS | Construction | 2021 |
| Skedsmo Samfunnshus AS | Real estate | 2012 |
| Skedsmo Tømrer & Betongentreprenør AS | Construction | 2012 |
| Skedsmokorset Legesenter AS | Health & social care | 2017 |
| Skeidar Skedsmo AS | Wholesale & retail | 1998 |
| Skintonic Skedsmo AS | Wholesale & retail | 2018 |
| Skolesirkelen AS | Information & communication | 2025 |
| Skolsegg Holding AS | Real estate | 2022 |
| Skolsegglia Fus Barnehage AS | Education | 2018 |
| Skovli Holding AS | | 2025 |
| Skraphandlerne AS | Wholesale & retail | 2021 |
| Skylars AS | Information & communication | 2019 |
| Skårstad Consulting AS | Professional & scientific | 2019 |
| Slitestålkompaniet AS | Wholesale & retail | 2005 |
| Smaksgaver AS | Wholesale & retail | 1994 |
| Smiley Budservice Ans | Transport & logistics | 1997 |
| Soft Drinks AS | Wholesale & retail | 2021 |