| Norsk Småfeservice AS | Wholesale & retail | 2015 |
| North Car AS | Wholesale & retail | 2023 |
| O.M. Holding AS | Construction | 2005 |
| Office Garden AS | Wholesale & retail | 2002 |
| Office Garden Holding AS | Professional & scientific | 2015 |
| Ol Taxi AS | Transport & logistics | 2022 |
| Ole M. Almeli AS | Construction | 1987 |
| Olf Holding AS | Professional & scientific | 2018 |
| Oslo Bilsalg AS | Wholesale & retail | 2022 |
| Oslo Snekkerservice AS | Construction | 2017 |
| Pinkka Holding AS | | 2025 |
| Polar Byggservice AS | Construction | 2018 |
| Primis Holding AS | | 2019 |
| R-Aa Holding AS | Real estate | 1987 |
| Rafpo AS | Construction | 2024 |
| Rakel-Eiendom AS | Real estate | 2022 |
| Rapkon Foods AS | Wholesale & retail | 2022 |
| RBL Holding AS | Other services | 2024 |
| Rbo Holding AS | Real estate | 2012 |
| Rishøy Handel AS | Wholesale & retail | 2025 |
| Romerike & Hadeland Blåseisolering AS | Construction | 2025 |
| Romerike Autosenter AS | Wholesale & retail | 2019 |
| Romerike Bilglass & Lakk AS | Other services | 2024 |
| Romerike Catering AS | Hospitality | 1991 |
| Romerike Trefelling AS | Agriculture & fishing | 2012 |
| Romerike Utleie AS | Administrative & support | 1997 |
| RS Trommelservice AS | Manufacturing | 2011 |
| Rubio Monocoat Norway AS | Wholesale & retail | 2018 |
| Rud Olsen Konsult AS | Construction | 2017 |
| Råholt Bil AS | Wholesale & retail | 2022 |
| Råholt Næring AS | Real estate | 2010 |
| Råholt Sentrum AS | Real estate | 2010 |
| Råholt Utvikling AS | Real estate | 2006 |
| Råholthøyden 3 AS | Real estate | 2017 |
| Rørinstal AS | Construction | 2025 |
| Sagene Finans AS | Real estate | 2012 |
| Sandra Brenna AS | Wholesale & retail | 2024 |
| Sanita Omsorg AS | Health & social care | 2013 |
| Scanvaegt Systems AS | Wholesale & retail | 2008 |
| Sce Holding AS | | 2015 |
| Serle AS | Construction | 2020 |
| Sinus Production Ans | Manufacturing | 1999 |
| Sjusjøhøyden AS | Real estate | 2011 |
| Skogen Group AS | Wholesale & retail | 2006 |
| Sly Eiendom AS | Wholesale & retail | 1995 |
| Smedstuen Eiendom AS | Real estate | 1989 |
| Snekkernord AS | Construction | 2014 |
| Snoksrud Securities AS | | 2023 |
| Sofa Møbler AS | Wholesale & retail | 2018 |
| Solberg Motor AS | Wholesale & retail | 2019 |
| Solgård Eiendom AS | Real estate | 2009 |
| Soundjahr AS | Arts & recreation | 2021 |
| Stalsberg Holding AS | | 2024 |
| Steinerud Mat Og Næring AS | Wholesale & retail | 2017 |
| Stenberg & Emilsen AS | Construction | 1996 |
| Stenberg & Emilsen Eiendom AS | Real estate | 2014 |
| Stera Maritim AS | Manufacturing | 2024 |
| Stoksflod Invest AS | | 2023 |
| Sundheim Holding AS | Wholesale & retail | 2020 |
| Sunwood Norge AS | Wholesale & retail | 2016 |
| Suveko AS | Administrative & support | 2026 |
| Sweet Consulting AS | Information & communication | 2020 |
| T-Pro AS | Wholesale & retail | 2014 |
| T.O. Bull Eiendom AS | Real estate | 2006 |
| TBC Norge AS | Administrative & support | 2023 |
| Teda Eiendom AS | Real estate | 2014 |
| Teleradio Norge AS | Manufacturing | 1994 |
| TGS Service Partner AS | Administrative & support | 2016 |
| Tilhengernor AS | Wholesale & retail | 2009 |
| Tilhengernor Dal AS | Other services | 2010 |
| TJM Eiendom AS | Construction | 2019 |
| Tob Holding AS | Real estate | 2012 |
| Toffeloffe AS | | 2022 |
| Touch Produkter AS | Wholesale & retail | 2015 |
| Trolldalen Holding AS | Real estate | 2017 |
| Trondeg PL AS | Professional & scientific | 2023 |
| Trondheimsvegen 310 AS | Real estate | 2011 |
| TSF Holding AS | Other services | 2018 |
| Turboconstroi Norge AS | Construction | 2014 |
| Turgut Holding AS | | 2026 |
| TWR AS | Professional & scientific | 2021 |
| Udnes Hvitevareservice AS | Other services | 2019 |
| Ulvenveien 2 AS | Real estate | 2011 |
| Unik Bolig & Eiendom AS | Real estate | 2014 |
| Utvendig Renovering AS | Construction | 2022 |
| Vaaler Samdrift Da | Agriculture & fishing | 2006 |
| Vaktsentralen AS | Administrative & support | 2017 |
| Valid Regnskap AS | Professional & scientific | 1989 |
| Vals Holding AS | Professional & scientific | 2020 |
| Villa Malthe AS | | 2026 |
| Voffe Hundehotell AS | Other services | 2023 |
| Vognvegen 16 AS | Real estate | 2022 |
| Vognvegen 23 AS | Real estate | 2002 |
| Vognvegen 28 AS | Real estate | 2019 |
| Von Haeger Holding AS | Information & communication | 2020 |
| VP Bygg AS | Wholesale & retail | 2015 |
| Vr.Trading.As | Wholesale & retail | 2013 |
| West Omsorg AS | Health & social care | 2021 |
| Westbye Eiendom AS | Real estate | 2018 |
| Wilmas Baguette & Sånn AS | Wholesale & retail | 2013 |