| Natur Og Grønt AS | Real estate | 2005 |
| Neonreklame Ans | Wholesale & retail | 2004 |
| Nordic Ice AS | Information & communication | 1987 |
| Nordic Polymer Processing Technology AS | Wholesale & retail | 2015 |
| Nordli Bygg AS | Construction | 2006 |
| NRJ Konsult AS | Professional & scientific | 2024 |
| Olivias Hjemmelagde AS | Wholesale & retail | 1994 |
| Omc AS | Manufacturing | 2019 |
| Onkel Rolf AS | | 2005 |
| Onsøy Golfbane AS | Arts & recreation | 1988 |
| Onsøy Golfbane Holding AS | Arts & recreation | 2021 |
| Onsøy Hyttepark AS | Real estate | 2008 |
| Onsøyhus AS | Construction | 2018 |
| Pavin AS | Transport & logistics | 2011 |
| Pettrelli AS | Wholesale & retail | 2014 |
| Phønix Galleri AS | Wholesale & retail | 2005 |
| Preg Barnehager Kjærre AS | Education | 2022 |
| Preutz Holding AS | Construction | 2020 |
| Profilagenturet AS | Wholesale & retail | 2001 |
| PT Hovland AS | Arts & recreation | 2024 |
| Qvistia Invest AS | | 2022 |
| R-B Holding AS | Real estate | 2011 |
| Ragnar Larsen Og Sønner Ans | Wholesale & retail | 1977 |
| Re-Turn AS | Professional & scientific | 1998 |
| Realturf Norway AS | Wholesale & retail | 2014 |
| Restaurant Onsøy Resort AS | Hospitality | 2022 |
| Roald Amundsens Vei 141 AS | Real estate | 2018 |
| Rune Kilebu AS | Real estate | 1996 |
| Rustad Sails AS | Manufacturing | 2018 |
| Rørleggermester Ole J. Kristiansen AS | Construction | 2020 |
| Sajh AS | | 2021 |
| Sand Terrasse AS | Real estate | 2009 |
| Seriebygg AS | | 2022 |
| Shipoperation AS | Transport & logistics | 2017 |
| Sinsoft AS | | 2013 |
| Skjæløy Bryggeselskap AS | Real estate | 2011 |
| Skjæløy Restaurantdrift AS | Hospitality | 2020 |
| Skjæløy Slipp AS | Real estate | 2004 |
| Skjæløy Slipp Båtmegling AS | Transport & logistics | 2004 |
| Skjæløy Slipp Marineservice AS | Manufacturing | 2018 |
| Slærød Dagligvare AS | Wholesale & retail | 2013 |
| Solberg Vann-Og Avløpslag SA | Water & waste | 2012 |
| Solli Handel Da | Real estate | 2024 |
| SP Motor & Marineservice AS | Manufacturing | 2007 |
| Spot Market AS | Real estate | 2013 |
| Sprudlende Sunn AS | Health & social care | 2012 |
| SRF AS | Professional & scientific | 2011 |
| Stabil Data Og Foto AS | Wholesale & retail | 2019 |
| Stall Kråketorp Ans | Agriculture & fishing | 2014 |
| Stasjonsbyen Eiendom AS | Real estate | 2019 |
| Stene Regnskap AS | Professional & scientific | 2014 |
| Stian Johansen Invest AS | | 2020 |
| Svemo Eiendom AS | Real estate | 2002 |
| Syver AS | | 2005 |
| Teso Kvalitetsmat AS | Wholesale & retail | 2017 |
| Thunem Ventures AS | | 2025 |
| Tore Takst AS | Professional & scientific | 2017 |
| Trendline Capital AS | Real estate | 2007 |
| Trevirke AS | Construction | 1991 |
| Trijon AS | | 2019 |
| Tømrerfirma Carl Jørgensen AS | Construction | 2010 |
| Vbygg AS | Construction | 2017 |
| Vibese AS | | 2024 |
| Viresta AS | Information & communication | 2026 |
| Warren Invest AS | | 2026 |
| Wattoshi AS | Information & communication | 2025 |
| Wingbeam AS | Professional & scientific | 2022 |
| Wulff Pack AS | | 2024 |
| Xpressen Pizza & Grill AS | Hospitality | 2023 |
| Xproco AS | Professional & scientific | 2011 |
| Østfold Holding AS | Real estate | 2005 |