| Opplæringsakademiet AS | Professional & scientific | 2020 |
| Orglos AS | Professional & scientific | 2025 |
| Pepita Eiendom AS | Real estate | 1999 |
| Pharmax AS | Wholesale & retail | 2020 |
| Pro Balanse AS | Professional & scientific | 2025 |
| Prospectus Management AS | Professional & scientific | 2021 |
| Prospectus Properties AS | Real estate | 2024 |
| Qurius AS | Wholesale & retail | 2008 |
| R & K Eiendom AS | Real estate | 2008 |
| Regnbuen Drift Da | Health & social care | 2011 |
| Regnskap & Administrasjon AS | Professional & scientific | 2024 |
| Renome AS | Real estate | 2005 |
| RHW Invest AS | Financial services | 2017 |
| Ronny Tangeland Transport AS | Transport & logistics | 1999 |
| RR Eiendom & Drift AS | Construction | 2024 |
| RS Vei Og Maskindrift Da | Construction | 2021 |
| RSG Maskinteknikk AS | Administrative & support | 2018 |
| Rune Jørgensen AS | Transport & logistics | 1997 |
| Rør Og Kanalrens AS | Water & waste | 1996 |
| Rør Og Kanalrens Holding AS | Water & waste | 2023 |
| S S T Thorolfsen Eiendom AS | Real estate | 1996 |
| S.A.H. Holding AS | | 2018 |
| Sacred Soulteaching AS | Other services | 2024 |
| Skaustua Omsorg AS | Health & social care | 2019 |
| Skjelhaugen Holding AS | | 2025 |
| SR Avl Og Sport AS | Education | 2020 |
| SR Sales AS | Arts & recreation | 2021 |
| SR Stables Eiendom AS | Real estate | 2020 |
| SR Stables Holding AS | Education | 2020 |
| Svinndal Gjerde Og Sveiseverksted AS | Manufacturing | 2000 |
| Svinndal Grave & Anleggsservice AS | Construction | 2010 |
| T.O. Bygg & Anlegg AS | Construction | 2018 |
| Takst Måleng AS | Professional & scientific | 2010 |
| TC Byggservice AS | Construction | 2026 |
| Tele Scan AS | Wholesale & retail | 1994 |
| Tennis-Trening.No AS | Education | 2024 |
| Thorsnes Utvikling AS | | 2016 |
| Tind Logistics AS | Professional & scientific | 2023 |
| Total Bygg Og Bolig AS | Real estate | 2026 |
| Tress Næring AS | Real estate | 2011 |
| Troost Partner Consult AS | Professional & scientific | 2005 |
| Tveter Gård Foredling AS | Agriculture & fishing | 2019 |
| Urhandel AS | Wholesale & retail | 2017 |
| V/S Holding AS | Arts & recreation | 2007 |
| Vadbakken 15 AS | Real estate | 2020 |
| Vadbakken Eiendom AS | Real estate | 1986 |
| Vadbakken Invest AS | Real estate | 2025 |
| Vekst Og Endring AS | Health & social care | 2016 |
| Ves Drift AS | Administrative & support | 2025 |
| Vestlia 1 Prosjekt AS | Real estate | 2025 |
| Viken Kompetanse AS | Education | 2015 |
| Viking Wood AS | Wholesale & retail | 2018 |
| VVS Isolering AS | Construction | 2021 |
| Våler Anlegg AS | Administrative & support | 2022 |
| Våler Graveservice AS | Construction | 1995 |
| Våler Kiosk & Gatekjøkken Ans | Wholesale & retail | 1991 |
| Våler Pc-Service Ans | Wholesale & retail | 1997 |
| Vålerlegene Da | Health & social care | 2015 |
| Vålerveien 1800 AS | Real estate | 2025 |
| W71 Invest AS | | 2024 |
| Wenche Glørud AS | Health & social care | 2026 |
| Winge Eiendom AS | Real estate | 2017 |
| Winge Graveservice AS | Construction | 2017 |
| Winge Holding AS | Construction | 2017 |
| Wire AS | Construction | 2025 |
| Wire Elektro AS | Construction | 2025 |
| XR Life Holding AS | Professional & scientific | 2000 |
| YRKESBIL1 - Utleie AS | Administrative & support | 2008 |
| Ysterud Anlegg AS | Construction | 2020 |
| Ø.M Eiendom AS | Real estate | 2020 |
| Ø.M Holding AS | Manufacturing | 2020 |
| ØG3 Eiendom AS | Real estate | 2024 |
| Østfold Bil Og Båtservice AS | Other services | 2015 |
| Østfold Bygg & VVS AS | Construction | 2026 |
| Østfold Taxi AS | Transport & logistics | 2025 |