| Storgata Fysioterapi Og Trening AS | Real estate | 2021 |
| Storgt 148 AS | Real estate | 2018 |
| Storgt 154 AS | Real estate | 2016 |
| Storm-Bygg AS | Construction | 2017 |
| Storm-Invest AS | Construction | 2018 |
| Stormyr Konsulent AS | Professional & scientific | 2025 |
| Storvand Scandinavia AS | Health & social care | 1984 |
| Storvegen Boliger AS | Real estate | 2017 |
| Storveien Familiebarnehage Ans | Education | 1995 |
| Storyshaper AS | Professional & scientific | 2025 |
| Strandberg AS | Wholesale & retail | 1982 |
| Strandsletta AS | Real estate | 2020 |
| Strandvegen Industri AS | Real estate | 2021 |
| Strategy AS | Administrative & support | 2005 |
| Stressman Engineering AS | Professional & scientific | 2010 |
| Stressman Oasis AS | Real estate | 2023 |
| Stressman Vaultron AS | Professional & scientific | 2024 |
| Stridsklev Helsehus AS | Health & social care | 2011 |
| Stridsklev Legekontor AS | Health & social care | 2019 |
| Stridsklev Spiseri AS | Hospitality | 2020 |
| Strimp Dagligvare AS | Wholesale & retail | 2019 |
| Strobefarm AS | Information & communication | 2017 |
| Strukturas AS | Professional & scientific | 1991 |
| Strukturas Equipment AS | Administrative & support | 2025 |
| Strukturas Holding AS | | 2023 |
| Strålelys AS | Health & social care | 2024 |
| Strømdalspynten AS | Real estate | 2007 |
| Strømdalspynten Invest AS | | 2015 |
| Strømstad AS | Construction | 2025 |
| Studio D.A.N.S. Da | Education | 2021 |
| Studio HM Frisør AS | Other services | 1998 |
| Styrk AS | Education | 2018 |
| Støperibakken Eiendom AS | Real estate | 2016 |
| Støperibakken Utvikling AS | Real estate | 2021 |
| Støy Investment AS | Real estate | 2016 |
| Støyva Holding AS | Professional & scientific | 2017 |
| Subli Norge AS | Wholesale & retail | 2025 |
| Sulesund AS | Wholesale & retail | 2024 |
| Sulesund Holding AS | | 2025 |
| Sundby Bolig AS | Real estate | 2018 |
| Sundbyhagen Eiendom AS | Real estate | 2018 |
| Sundsbarm Kraftverk Da | Energy | 1962 |
| Superfood Norway AS | Wholesale & retail | 2014 |
| Supporterutstyr Jørandrud & Co Ans | Wholesale & retail | 1979 |
| Svalastog Bygg AS | Construction | 2002 |
| Svar 418 AS | | 2022 |
| Svarstad Rose AS | Real estate | 2020 |
| Svartangen Bryggelag SA | Real estate | 2026 |
| Svartdal AS | Professional & scientific | 2015 |
| Svega AS | Real estate | 1995 |
| Svendsen Dental Holding AS | | 2023 |
| Svensrud Transport AS | Transport & logistics | 1989 |
| Sverresgaard AS | Real estate | 2020 |
| Sverresgate 12 Eiendom AS | Real estate | 2011 |
| Sverresgate 13 AS | Real estate | 2005 |
| Svinhult Jaktstuga Da | Professional & scientific | 2011 |
| Swift Supply AS | Wholesale & retail | 2023 |
| Sykar Holding AS | | 2019 |
| Sykkelkollektivet AS | Other services | 2025 |
| Synneva Konsulent AS | Information & communication | 2025 |
| Sæbo Eiendom Selskab Da | Real estate | 1997 |
| Sæsvatn Kraftformidling SA | Energy | 2022 |
| Sølverød Da | Administrative & support | 2006 |
| Søren Lorentzen Trevare AS | Manufacturing | 2007 |
| Sørhaug Eiendom AS | Real estate | 2016 |
| Sørhaugkvartalet Holding AS | Real estate | 2025 |
| Søsterhjemmet AS | Real estate | 2007 |
| Søsterhjemmet Legesenter Da | Health & social care | 2008 |
| Søsterhjemmet Tannlegesenter AS | Health & social care | 2021 |
| Søvik & Ødegård AS | Construction | 2005 |
| T. Jansen AS | Other services | 2016 |
| T.E.Transport AS | Transport & logistics | 2025 |
| T.Kaalstad AS | | 2023 |
| T.T.S AS | Administrative & support | 2020 |
| T4 Invest AS | | 2026 |
| Tak Og Fasadeforvaltning AS | Professional & scientific | 2002 |
| Takeaway Holding AS | Construction | 2003 |
| Takst Og Byggpartner AS | Real estate | 2024 |
| Talaria Norge AS | Manufacturing | 2013 |
| Talent Gallery AS | Professional & scientific | 1997 |
| Tall Holding AS | | 2006 |
| Talmo Bygg AS | Construction | 2021 |
| Talmo Holding AS | Real estate | 2019 |
| Tamburvegen Invest AS | Real estate | 2008 |
| Tangen Shipping AS | Transport & logistics | 2000 |
| Tangen Shipping Holding AS | Transport & logistics | 1996 |
| Tango Akademiet AS | Education | 2000 |
| Tango Drift AS | Other services | 1999 |
| Tango Frisør Gulset AS | Other services | 2019 |
| Tangvall Næring AS | Real estate | 2017 |
| Tank Og Trailervask AS | Administrative & support | 1982 |
| Tannlege Aakre AS | Health & social care | 2021 |
| Tannlege Anne Helene Thorkildsen Ødegård AS | Health & social care | 2024 |
| Tannlege Borge AS | Health & social care | 2017 |
| Tannlege Knut Jore AS | Health & social care | 2025 |
| Tannlege Svendsen AS | Health & social care | 2023 |
| Tannlege Terje Fredriksen AS | Health & social care | 2026 |
| Tannlege Thorkildsen AS | Health & social care | 2013 |
| Tannlege Unni Augestad AS | Health & social care | 2013 |
| Tannlege Zeyad AS | Health & social care | 2013 |