| Purmo Group Sweden Nuf | Wholesale & retail | 2010 |
| R-Nr AS | | 2000 |
| Rakeievegen 162/15 AS | Real estate | 2018 |
| Raumnes AS | Information & communication | 1947 |
| Raumnesgården AS | Real estate | 1968 |
| RB Byggutvikling AS | Real estate | 2016 |
| Regalia AS | Wholesale & retail | 2022 |
| Richard Group Holding AS | | 2025 |
| Rimtussene AS | | 2017 |
| Ringstad Bygg AS | Construction | 2001 |
| Robek AS | Financial services | 2005 |
| Roland 1 Holding AS | | 2021 |
| Roland Invest AS | Real estate | 2001 |
| Rolf Haugen Holding AS | | 2015 |
| Roma Brus Shop Årnes AS | Real estate | 1989 |
| Romerike Anleggsservice AS | Construction | 2020 |
| Romerike Bilverksted Og Skadesenter AS | Other services | 2025 |
| Romerike Eiendomsinvestering AS | Real estate | 2018 |
| Romerike Maskin AS | Construction | 2003 |
| Romerike Maskinstasjon AS | Administrative & support | 2013 |
| Romerike Regnskap AS | Professional & scientific | 2019 |
| Roseid Holding AS | Real estate | 2018 |
| Rovenveien 533 AS | Real estate | 2025 |
| RTK Holding AS | Real estate | 2013 |
| RTK Jessheim AS | Real estate | 2020 |
| Runni Boligutvikling AS | Real estate | 2016 |
| Runni Consult AS | Financial services | 2014 |
| Runni Gjestegård AS | Hospitality | 2019 |
| Runnibakken 20 Årnes AS | Real estate | 2012 |
| Runnigarasjen AS | Real estate | 2009 |
| Rønaas AS | Construction | 2012 |
| Rønaas Eiendom I AS | Construction | 2016 |
| Rønaas Entreprenør AS | Construction | 2018 |
| Rønningen Holding Og Invest AS | | 2026 |
| Rønningen Maskin AS | Construction | 2005 |
| Rørlegger Odd Jensen AS | Construction | 2011 |
| S&A BM Holding AS | Real estate | 2019 |
| Saga Eiendom Knatten AS | Real estate | 2023 |
| Saga Regnskap Årnes AS | Professional & scientific | 2002 |
| Sagbruksgata 4 AS | Real estate | 2023 |
| Sagvegen AS | Real estate | 2018 |
| Salong Aleksandersen AS | Other services | 2012 |
| Salong Duo Ans | Other services | 1995 |
| Samaf Invest AS | Financial services | 2012 |
| Sandholt & Hansen Dyretransport AS | Transport & logistics | 2021 |
| Sandmo Binæring AS | Agriculture & fishing | 2017 |
| Sbhgolf AS | Education | 2023 |
| Scandinavian Technology AS | Wholesale & retail | 2000 |
| Schur Pack Norway AS | Administrative & support | 1988 |
| Sebye Holding AS | | 2024 |
| Selby AS | Information & communication | 2001 |
| Semmingsrud Invest AS | Financial services | 2005 |
| Shine Bilvask Og Bilpleie AS | Other services | 2016 |
| Sigmund Espeland AS | Manufacturing | 1987 |
| Sign Partner AS | Professional & scientific | 2025 |
| Sign Production AS | Manufacturing | 2016 |
| Sign Text AS | Wholesale & retail | 1999 |
| Sissel BM Holding AS | | 2018 |
| Sivilingeniør Eirik Botnmark AS | Professional & scientific | 2014 |
| Skandinavisk Elektronikk AS | Wholesale & retail | 1964 |
| Skotøimagasinet AS | Wholesale & retail | 2009 |
| Skotøimagasinet Holding AS | Wholesale & retail | 1964 |
| Skårerverket Holding AS | Real estate | 2014 |
| Sl-Multiservice AS | Construction | 2021 |
| Slettumgården AS | Real estate | 1985 |
| Snor-Rett AS | Construction | 2024 |
| Soh Maskinutleie AS | Administrative & support | 2021 |
| Solberggården AS | Real estate | 1981 |
| Solidfoundation AS | Information & communication | 2024 |
| Solution Facility AS | Administrative & support | 2025 |
| Solås AS | Real estate | 2021 |
| Spar Eiendom Holding Årnes AS | Real estate | 2005 |
| Spar Eiendom Årnes AS | Real estate | 2005 |
| Sporet Pub AS | Hospitality | 2020 |
| Stall Olstad Da | Agriculture & fishing | 2000 |
| Stangeskovene Årnes AS | Wholesale & retail | 2016 |
| Stanja AS | Financial services | 2011 |
| Stareng Bygg AS | Construction | 2025 |
| Sten Tørnby AS | Transport & logistics | 2020 |
| Stft 03 04 25 AS | | 2025 |
| Stft 04 04 25 AS | | 2025 |
| Stft 05 04 25 AS | | 2025 |
| Stft 06 04 25 AS | | 2025 |
| Stft 07 04 25 AS | | 2025 |
| Stft 08 04 25 AS | | 2025 |
| Stft 09 04 25 AS | | 2025 |
| Stift AS | Professional & scientific | 2024 |
| Stobbe Bygg AS | Construction | 2022 |
| Studio-Sax Da | Other services | 2018 |
| Sund Engineering AS | Professional & scientific | 2020 |
| Svendsen Konsult AS | | 2021 |
| Søgård Eiendom AS | Real estate | 2016 |
| Søgård Holding AS | Construction | 2024 |
| Søndre Løken Gård AS | Agriculture & fishing | 2015 |
| Søndre Sandaker AS | Real estate | 2019 |
| T. a. Holding AS | Wholesale & retail | 2014 |
| T. Linnes Holding AS | | 2022 |
| Taha Trading AS | Wholesale & retail | 2025 |
| Takst AS | Real estate | 2006 |
| Tannlege Per Egil Øyri AS | Health & social care | 2025 |