| Perlen Capital AS | | 2025 |
| PH Utvikling AS | Real estate | 2018 |
| Philini International School AS | Education | 2026 |
| PLD AS | Wholesale & retail | 2023 |
| Prosesskonsult AS | Professional & scientific | 2015 |
| Pure Property AS | Real estate | 2020 |
| Quality Hair AS | Real estate | 2011 |
| Quick Truckservice AS | Wholesale & retail | 2025 |
| Quick Truckservice Utleie AS | Administrative & support | 2025 |
| Quipu AS | Real estate | 2026 |
| Radon Øst AS | Professional & scientific | 2012 |
| Re - Invest AS | Manufacturing | 2005 |
| Rett Meyer Holding AS | Manufacturing | 2021 |
| Riving Og Sjauing AS | Construction | 2024 |
| Rivingsteknikk AS | Construction | 2014 |
| Roald Amundsens Vei 148 AS | Real estate | 2016 |
| Roald Amundsensvei 136 AS | Real estate | 2015 |
| Robust Partner AS | Information & communication | 2025 |
| Rudskogen Tomter 9 AS | Real estate | 2022 |
| Rustfritt AS | Manufacturing | 2020 |
| Råd & Regnskap AS | Professional & scientific | 1993 |
| Rådhusveien 15 AS | Real estate | 2019 |
| Saans AS | Wholesale & retail | 2016 |
| Safe Bil AS | Wholesale & retail | 2012 |
| Safe Computing AS | Information & communication | 2002 |
| Safe Consulting AS | Wholesale & retail | 2000 |
| Safe Logistic AS | Wholesale & retail | 1997 |
| Safe Management AS | Professional & scientific | 2000 |
| Samoti AS | Professional & scientific | 2006 |
| Sandem Eiendom AS | Real estate | 2008 |
| Scrappiness AS | Wholesale & retail | 2016 |
| Scservices AS | Information & communication | 2012 |
| Sealtech AS | Construction | 2018 |
| Seapartner AS | Transport & logistics | 2014 |
| Seid Redjepi Dagligvare AS | Wholesale & retail | 2025 |
| Selectit Eiendom AS | Real estate | 2025 |
| Sirkel Eiendom AS | Real estate | 2012 |
| Sirkel Holding AS | Real estate | 2013 |
| Sirkel Selvvask AS | Other services | 2013 |
| Sivilingeniør Espen Thøgersen AS | Professional & scientific | 2024 |
| Skarpenord Corrosion AS | Manufacturing | 1984 |
| Skilthandleriet AS | Manufacturing | 2014 |
| Snøfonna Eiendom AS | Real estate | 2014 |
| Sola Til Ola AS | Other services | 2020 |
| Spillwill AS | Wholesale & retail | 2024 |
| Spjærholmen Og Holmetangen Vann- Og Avløpslag SA | Water & waste | 2007 |
| Spylebilen AS | Construction | 2024 |
| Stha Holding AS | | 2024 |
| Stronkbuddy Dive Academy AS | Education | 2026 |
| Stryker AI AS | | 2026 |
| Stryker Eiendomsutvikling AS | Real estate | 2001 |
| Strykerveien 1 Eiendom AS | Real estate | 2010 |
| Strykerveien 13 AS | Real estate | 2025 |
| Strykerveien 2 Eiendom AS | Real estate | 2010 |
| Strykerveien 24 AS | Real estate | 2012 |
| Strykerveien 26 AS | Real estate | 2025 |
| Sulfatveien 15 AS | Real estate | 2021 |
| Sulfatveien 17 AS | Real estate | 2021 |
| SV Bygg AS | Construction | 2025 |
| Svensen-Eiendom AS | Real estate | 2007 |
| Svoger AS | Wholesale & retail | 2022 |
| Sørensen Garasjebygg Ans | Construction | 1997 |
| Sørum Elektro AS | Construction | 1998 |
| T & J Invest AS | Real estate | 2007 |
| Tagarani Bygg AS | Construction | 2019 |
| Thorleif Weberg AS | Real estate | 1985 |
| TMV AS | Real estate | 1984 |
| Tolfsen Holding AS | Construction | 2017 |
| Tommy Larsen Transport AS | Transport & logistics | 2015 |
| Torp Byggkonsult AS | Professional & scientific | 1998 |
| Torp Marinepark AS | Real estate | 1997 |
| Torp Mek. Verksted AS | Manufacturing | 2012 |
| Torp Møbeltapetsering AS | Other services | 2016 |
| Torp Utvikling AS | Real estate | 2009 |
| Torpeskolen Filosofifabrikk AS | Arts & recreation | 2019 |
| Torvet 6 Skjærhalden AS | Real estate | 2025 |
| Toyota Østfold AS | Wholesale & retail | 2001 |
| TR Meyer Holding AS | | 2025 |
| Tretor AS | Real estate | 2006 |
| Tretor Invest II AS | Real estate | 2006 |
| Tricon AS | Wholesale & retail | 2002 |
| Trine Hundeartikler AS | Manufacturing | 2005 |
| Trollklubben Barnehage AS | Education | 2004 |
| Trollklubben Torp AS | Education | 2022 |
| Trust International AS | Professional & scientific | 2019 |
| Trykkeribakken AS | Real estate | 2025 |
| Trykkeriveien 2 AS | Real estate | 2025 |
| Twins Norge AS | Wholesale & retail | 1988 |
| Vebergveien Avløp SA | Water & waste | 2019 |
| Veland Auto AS | Wholesale & retail | 2012 |
| Vfno AS | Hospitality | 2014 |
| Villnor AS | | 2025 |
| Vogn-Service AS | Wholesale & retail | 1971 |
| Vrasmussen Holding AS | | 2025 |
| VS Byggservice AS | Construction | 2012 |
| Vyrke Bygg AS | Construction | 2025 |
| Weberg Rekkverk AS | Construction | 2023 |
| ZSP Invest AS | Real estate | 2021 |
| Årum Bygg AS | Construction | 2025 |
| Årum Holding AS | | 2026 |