| Nannestad Sankelag SA | Agriculture & fishing | 1975 |
| Nannestad Taktekking AS | | 2023 |
| Nannestad Tre Og Tråd AS | Wholesale & retail | 2023 |
| Nannestad VVS AS | Construction | 2020 |
| NGM Eiendom AS | Real estate | 2015 |
| Niklas M Lindström Holding AS | Real estate | 2021 |
| Nilamar AS | Agriculture & fishing | 2005 |
| Ninka AS | Administrative & support | 2022 |
| Ninka Holding AS | | 2025 |
| Nix Holding AS | Construction | 2018 |
| NNJ AS | | 2021 |
| Northgenix AS | Other services | 2025 |
| NRX Holding AS | Professional & scientific | 2025 |
| NST Gardermoen MC AS | Wholesale & retail | 1993 |
| Nye Hus Eiendom AS | Real estate | 2020 |
| Nymann Invest AS | | 2025 |
| O&P Håndverk Og Takst AS | Real estate | 2023 |
| Oljeservice Maura AS | Transport & logistics | 1995 |
| Omid Momand AS | Wholesale & retail | 2016 |
| Onsrud Auto AS | Wholesale & retail | 2022 |
| Optimaljakt AS | Administrative & support | 2023 |
| Park and Fly AS | Transport & logistics | 2025 |
| Peanut AS | Information & communication | 2016 |
| PGM AS | Wholesale & retail | 2013 |
| Pilot AS | Professional & scientific | 1998 |
| Polar Crown AS | Professional & scientific | 2026 |
| Profil & Reklame Service AS | Professional & scientific | 2022 |
| Pudzik Eiendom AS | Real estate | 2020 |
| Rebella Art AS | Agriculture & fishing | 2018 |
| Ride Leahu Da | Transport & logistics | 2025 |
| RMR AS | Transport & logistics | 2021 |
| Ro-Ev AS | Construction | 2024 |
| Roger Toftner AS | Professional & scientific | 1997 |
| Romerike Industrilakkering Da | Manufacturing | 2007 |
| Romerike Markiseservice AS | Wholesale & retail | 1987 |
| Romerike Pipe Service AS | Construction | 2018 |
| Rønning Lysaker AS | Real estate | 2015 |
| Røsåsen Skogsmaskiner AS | Agriculture & fishing | 2000 |
| Sagstuen Tak Og Metall AS | Construction | 2022 |
| Sasa AS | Hospitality | 2019 |
| Seljevold Invest AS | | 2025 |
| Sellstrøm Transport AS | Transport & logistics | 2006 |
| Sidensvans Invest AS | Real estate | 2022 |
| Sirus Gruppen AS | | 2026 |
| Sita B.V. Nuf | Information & communication | 2000 |
| Skak Holding AS | | 2026 |
| SLT AS | Transport & logistics | 2012 |
| Solheim Barnehage SA | Education | 1992 |
| SP Com AS | | 2026 |
| Sptrucking AS | Wholesale & retail | 2022 |
| Stangeskovene Bjerke AS | Wholesale & retail | 2005 |
| Star Pizzeria AS | Hospitality | 2021 |
| Stensgård Transport AS | Transport & logistics | 2022 |
| Stian a. Olsen AS | Construction | 2017 |
| Storstein Holding AS | Real estate | 2017 |
| STRATUM3D AS | Wholesale & retail | 2021 |
| Strete Transport AS | Transport & logistics | 2017 |
| Støk AS | Real estate | 2014 |
| Støk Handel AS | Wholesale & retail | 2014 |
| Surely AS | Wholesale & retail | 2026 |
| Suveren Eiendom AS | Real estate | 2015 |
| Sørensen VVS AS | Construction | 2026 |
| T. Fredrikstad Verkstedtjenester AS | Other services | 2026 |
| T. Tomren Holding AS | | 2018 |
| T.A.K Eiendom AS | Real estate | 2026 |
| T.A.K Entreprenør AS | Construction | 2026 |
| T.A.K Invest AS | | 2021 |
| Tak Og Bygg AS | Real estate | 2013 |
| TB Rådgivning AS | Professional & scientific | 2020 |
| Team Julusmoen AS | Professional & scientific | 2025 |
| Terje Kjærvik AS | Financial services | 2013 |
| Thell Holding AS | Real estate | 2011 |
| Thida Utvikling AS | Real estate | 2011 |
| Tingulstad AS | Real estate | 2013 |
| Tiril Invest AS | | 2015 |
| TK Tømmertransport AS | Transport & logistics | 2015 |
| TM Global Investment AS | | 2025 |
| TM Rønning AS | Real estate | 2015 |
| TM Skjølås AS | Construction | 2022 |
| Trekling Drift AS | Manufacturing | 2022 |
| Trollheimen SA | Arts & recreation | 1945 |
| Trygghet I Fokus AS | Administrative & support | 2012 |
| Tul Holding AS | | 2026 |
| TWB Invest AS | | 2022 |
| Tærudparken Eiendom AS | Real estate | 2021 |
| Uhren Holding AS | Construction | 2023 |
| Ullensaker Almenning AS | | 2020 |
| Ullensaker Almenning KS | | 2020 |
| Ultra Vedlikehold AS | Administrative & support | 2023 |
| Utendørsliv AS | Wholesale & retail | 2024 |
| Va Haug Eiendom AS | Real estate | 2022 |
| Va Haug Holding AS | Manufacturing | 2022 |
| Vacunor AS | Wholesale & retail | 2014 |
| Verktøysliping AS | Wholesale & retail | 2014 |
| Vestenga Invest AS | Financial services | 2015 |
| Vestre Hurdalsveg 31 AS | Wholesale & retail | 2013 |
| Veterinær Ac Løvås AS | Professional & scientific | 2013 |
| Veterinær Klo AS | Professional & scientific | 2012 |
| Veto Transport AS | Transport & logistics | 2010 |
| Vexo Prosjekt AS | Construction | 2025 |