| Nesåsen Barnehage SA | Education | 2000 |
| Next Bite AS | Hospitality | 2026 |
| Nice Try Holding AS | | 2022 |
| NN Gruppen AS | Health & social care | 2026 |
| Noan AS | Financial services | 2018 |
| Nordbil Oslo AS | Wholesale & retail | 2026 |
| Nordic Hockey AS | Wholesale & retail | 2018 |
| Nordic Light Produksjon AS | Arts & recreation | 2021 |
| Norlast Da | Transport & logistics | 2002 |
| Norsk Eggeband Ans | Arts & recreation | 2017 |
| Norsk Matretur AS | Water & waste | 2006 |
| Northern Delicacies AS | Wholesale & retail | 2025 |
| Nova Commerce AS | Wholesale & retail | 2026 |
| NPG Holding AS | | 2024 |
| Oberst Invest AS | | 2007 |
| Ollendorff Eiendom AS | Real estate | 2007 |
| Ollendorff Holding AS | Mining & quarrying | 2017 |
| On the Way AS | Transport & logistics | 2024 |
| Optivo AS | | 2024 |
| Orbit Holding AS | | 2026 |
| Ors International AS | Wholesale & retail | 2009 |
| Oscars Gate 19 AS | Real estate | 2023 |
| Oslo Paintball AS | Arts & recreation | 2018 |
| Pak Holding AS | Information & communication | 2005 |
| Pencom AS | Wholesale & retail | 2016 |
| Pine Tree AS | Information & communication | 2020 |
| Prana Helsekost AS | Wholesale & retail | 2024 |
| Premium Wrap AS | Professional & scientific | 2024 |
| Procona AS | Information & communication | 2003 |
| Program Consulting AS | Professional & scientific | 2019 |
| PTM Bygg AS | Construction | 2026 |
| Renholdsglede AS | Administrative & support | 2026 |
| Renlink AS | Wholesale & retail | 2026 |
| Reno & Hus AS | Construction | 2025 |
| Rezari AS | Wholesale & retail | 2026 |
| Rishidekor AS | Professional & scientific | 2019 |
| Romset Holding AS | | 2021 |
| Rusve Holding AS | | 2020 |
| Secrets by B AS | Professional & scientific | 2012 |
| Secrets by B Avd.Grünerløkka AS | Wholesale & retail | 2024 |
| Sial Invest AS | Professional & scientific | 2022 |
| Signatur Håndverk AS | Construction | 2026 |
| Sigrid Risøe AS | | 2026 |
| Sikker Service AS | Construction | 2015 |
| Sikre AS | Information & communication | 2019 |
| Sivakumar AS | | 2025 |
| Sivilingeniør Daniel Nesset AS | Professional & scientific | 2019 |
| Sk-Bygg&Eiendom AS | Real estate | 2022 |
| Skaarer Bygg AS | Construction | 2024 |
| Skanke Holding AS | Financial services | 2018 |
| Skorsteinsutstyr AS | Wholesale & retail | 2019 |
| SKS Invest AS | Real estate | 2005 |
| Smedheim Bjerklund AS | Wholesale & retail | 2024 |
| Snap Transport Og Bildeler AS | Administrative & support | 2021 |
| Snosi Design AS | | 2025 |
| Snpl AS | Professional & scientific | 2024 |
| Solid Frakt AS | Transport & logistics | 2020 |
| Solid Kompetanse AS | Education | 2024 |
| Solid Malermester & Entreprenør AS | Construction | 2026 |
| Solidus Eiendom AS | Real estate | 2005 |
| Solvit AS | Information & communication | 2013 |
| Speedboys Budservice Ans | | 1990 |
| Status Bygg Norge AS | Construction | 2009 |
| Strande Eiendomsutleie AS | Real estate | 2003 |
| Sultan Barber Shop AS | Other services | 2023 |
| Sweetoos AS | Manufacturing | 2024 |
| Sykkelstash AS | Wholesale & retail | 2023 |
| Syverud AS | Wholesale & retail | 2005 |
| Sætrengården AS | Real estate | 1996 |
| Sørli Barnehage SA | Education | 1988 |
| T2S Eiendom AS | Real estate | 2025 |
| Tafaj Fruktmarked Da | Wholesale & retail | 2005 |
| Takt Eiendom AS | Real estate | 2020 |
| Tara Bolig Og Interiør AS | Professional & scientific | 2025 |
| Taxico AS | Transport & logistics | 2020 |
| TDN Consulting AS | Professional & scientific | 2024 |
| Tenold Boligeiendom AS | Real estate | 2006 |
| Tenold Boligutvikling AS | Real estate | 2013 |
| Tenold Eiendom AS | Real estate | 2008 |
| Tenold Eiendomsutvikling AS | Real estate | 2008 |
| Tenold Gruppen AS | Real estate | 2002 |
| Tenold Gruppen Holding AS | Real estate | 2004 |
| Tentex AS | Wholesale & retail | 2006 |
| Thomas Ellefsen Invest AS | Real estate | 2019 |
| Thorsø Holding AS | | 2026 |
| Tjukanoui Holding AS | | 2024 |
| TK & K Consulting AS | Financial services | 2012 |
| TL Frisør AS | Other services | 2014 |
| Totv Invest AS | | 2021 |
| Trendora AS | Wholesale & retail | 2026 |
| Tri-Ksr AS | Financial services | 1975 |
| Ullano AS | Information & communication | 2019 |
| Unik Group AS | Administrative & support | 2025 |
| Union Malere Oslo AS | Construction | 2024 |
| Varde Auto AS | Wholesale & retail | 2023 |
| VH Flis AS | Construction | 2019 |
| Viklund Holding AS | | 2025 |
| Vilje Eiendom AS | Real estate | 2023 |
| Visual Scent AS | Financial services | 2005 |
| Volt Ventures AS | | 2024 |