| Senito AS | Real estate | 2013 |
| Senito Invest AS | | 2020 |
| Septimus AS | Real estate | 2020 |
| Septimus Holding AS | Real estate | 2020 |
| Servoinvest AS | Real estate | 2005 |
| Seth AS | Real estate | 1978 |
| Setoso AS | | 2025 |
| Settla Solutions AS | | 2023 |
| Shorewise AS | Information & communication | 2025 |
| Sian Invest AS | Real estate | 2004 |
| Simsol AS | Financial services | 2018 |
| Sjhs Holding AS | Hospitality | 2023 |
| Sjøboden AS | Financial services | 2017 |
| Skarnes Industrilager AS | Administrative & support | 1972 |
| Skaug Forvaltning AS | Financial services | 2005 |
| Sko Partner AS | Wholesale & retail | 1992 |
| Skogholmen Industrier AS | Financial services | 2007 |
| Skøyen Bolig AS | Real estate | 2026 |
| Sloth Holding AS | | 2021 |
| SLS Investering AS | Professional & scientific | 2017 |
| SM Ventures AS | | 2025 |
| Snarøen Båtservice AS | Wholesale & retail | 2023 |
| Snarøen Båtservice Holding AS | Wholesale & retail | 2023 |
| Soft Spot AS | Real estate | 2012 |
| Sohlberg Create AS | Financial services | 2011 |
| Sohlberg Invest AS | Real estate | 2005 |
| Solglimt Holding AS | | 2020 |
| Solheim Capital AS | | 2018 |
| Solskinn Holding AS | | 2020 |
| Solskinnet Holding AS | | 2020 |
| Solstrand Invest AS | Real estate | 2005 |
| Solstråle AS | Real estate | 2011 |
| Somi AS | | 2023 |
| Sondell Invest AS | Real estate | 2018 |
| SPL Invest AS | Financial services | 2014 |
| Sporty Renhold AS | Administrative & support | 2025 |
| Sporty Topco AS | | 2025 |
| Stange & Co Revisjon AS | Professional & scientific | 2025 |
| Stangeland Invest AS | Financial services | 2013 |
| Stayer Shipinvest AS | Financial services | 2014 |
| Steep Hill AS | Professional & scientific | 2021 |
| Steinar Manengen AS | Professional & scientific | 2011 |
| Steiro Holding AS | | 2018 |
| Stian Oppegaard AS | Professional & scientific | 2022 |
| Stian Solli Kanestrøm AS | Health & social care | 2012 |
| Stilco AS | | 2023 |
| Stocktips by Jens AS | Professional & scientific | 2023 |
| Stor Oslo Data AS | Information & communication | 2025 |
| Storelurv AS | | 2022 |
| Struc & Marine AS | Professional & scientific | 2000 |
| Struktur Og Marine AS | Professional & scientific | 1997 |
| Stølan Invest AS | | 2020 |
| Sundbakken 5 AS | Real estate | 2025 |
| Sunn Økonomi AS | Professional & scientific | 2004 |
| Super Entreprenør AS | Construction | 2022 |
| Sverre Gaasrud Holding AS | Real estate | 2007 |
| Syberg Eiendom AS | Real estate | 1981 |
| Synapse AS | Professional & scientific | 1988 |
| Søndre Finstad AS | | 2021 |
| T & J Eiendom AS | Real estate | 2022 |
| Taugbøl Holding AS | Real estate | 2017 |
| Techstian AS | Wholesale & retail | 2000 |
| Techteam Ingeniør- Og Datatjenester AS | Professional & scientific | 2002 |
| Temasi AS | Professional & scientific | 2009 |
| The Innovation Effect AS | Information & communication | 2012 |
| Theo Investments AS | | 2006 |
| Thøgersen AS | | 2026 |
| Ticato AS | Professional & scientific | 2005 |
| Tie Connect AS | Information & communication | 2023 |
| Tippr AS | | 2026 |
| TITI1 AS | | 2021 |
| TITI2 AS | | 2021 |
| Tmts Invest AS | Financial services | 2021 |
| Tofte Utvikling AS | Real estate | 2011 |
| Toftes Gate 64 AS | Real estate | 2025 |
| Toni Holding AS | Financial services | 2005 |
| Topptur AS | Professional & scientific | 2005 |
| Topspin AS | Professional & scientific | 2012 |
| Torrey Pines AS | Information & communication | 2005 |
| Total Verdianalyse AS | Professional & scientific | 2004 |
| Toveien 30 AS | Real estate | 2023 |
| TPG Sør AS | Real estate | 2018 |
| Traconet AS | Professional & scientific | 2007 |
| Traconet Holding AS | Real estate | 2008 |
| Tradisjonsbygg Eiendomsutvikling AS | Real estate | 2001 |
| Trolls AS | Professional & scientific | 2020 |
| Tunr Arkitektur + Design AS | Professional & scientific | 2025 |
| Tvist Print AS | Manufacturing | 2012 |
| Ucon Offshore AS | Professional & scientific | 1996 |
| Uranienborg Utbyggingsselskab AS | Real estate | 2015 |
| Urox Norge AS | Manufacturing | 2014 |
| Utleiell Da | Administrative & support | 2022 |
| V Invest AS | Wholesale & retail | 2005 |
| Vabro AS | | 2026 |
| Valløveien AS | Real estate | 2008 |
| Vannmelon AS | | 2024 |
| Vassholmen Samvirkeforetak SA | Real estate | 2012 |
| Vasstvedt Holding AS | Financial services | 2005 |
| Venture Holding AS | Professional & scientific | 2013 |
| Venturegroup AS | | 2025 |