| Skarestrand Gruppen AS | Real estate | 2005 |
| Skedsmo Bud & Vare AS | Transport & logistics | 1992 |
| Skikkelig Rent AS | Administrative & support | 2024 |
| Skinclinic AS | Health & social care | 2020 |
| Skjettenveien 40 Eiendom AS | Real estate | 2012 |
| Skjønt AS | Other services | 2016 |
| Skogmo Vest 1 AS | Real estate | 2019 |
| Skogmo Vest AS | Real estate | 2025 |
| Skogteknikk AS | Wholesale & retail | 2015 |
| SKR Eiendom AS | Real estate | 2024 |
| Skycap AS | Wholesale & retail | 2024 |
| Slattum Holding AS | | 2026 |
| Slettavegen 2 AS | Real estate | 2023 |
| Slettaveien 1 AS | Real estate | 2010 |
| Sletthøe Holding AS | | 2026 |
| Sletvold Eiendom AS | Real estate | 2001 |
| Sletvold Holding AS | Wholesale & retail | 2005 |
| Sletvold Tapet Og Gulv AS | Construction | 1997 |
| SLF Bil AS | Wholesale & retail | 2023 |
| Slice Invest AS | Real estate | 2021 |
| Slinning AS | Professional & scientific | 2000 |
| SLT Herstua AS | Administrative & support | 2019 |
| Smart Cabs AS | Transport & logistics | 2011 |
| Smart Rides AS | Transport & logistics | 2025 |
| Smartbook Technology AS | Information & communication | 2014 |
| SMB Invest AS | Professional & scientific | 1996 |
| Smba Holding AS | | 2024 |
| Smerud Invest AS | Construction | 2024 |
| Smokvina Holding AS | Professional & scientific | 2024 |
| Smokvina Salg Og Konsulentservice AS | Professional & scientific | 2024 |
| SMW Group AS | | 2025 |
| Smått Eiendom AS | Real estate | 1991 |
| Snapa Holding AS | | 2023 |
| Snekker Edseth AS | Construction | 2023 |
| Snekker Jostein Dahl AS | Construction | 2020 |
| Snekker Og Tak AS | Construction | 2020 |
| Snekker Vision AS | Construction | 2025 |
| Snekkerfirma Tor Eivind Hagen AS | Construction | 2019 |
| Snöfokk Film AS | Information & communication | 2012 |
| Snøgrønt AS | Administrative & support | 2024 |
| Soelberg AS | | 2025 |
| Soelberg Transport AS | Transport & logistics | 2013 |
| Sogna Eiendomsutvikling AS | Real estate | 2026 |
| Sohn Group AS | Professional & scientific | 2024 |
| Sokk AS | Real estate | 2021 |
| Solgården AS | Real estate | 2002 |
| Solheim Event Og Reiser AS | Administrative & support | 2012 |
| Solheimen AS | Professional & scientific | 2005 |
| Solid Maskin Og Utleie AS | Construction | 2024 |
| Solli Dampsaga AS | Real estate | 2018 |
| Solli Klinikk AS | Health & social care | 1997 |
| Solstråla Familie Barnehage Da | Education | 2024 |
| SOLUTION4 AS | Information & communication | 2021 |
| Solvang Pumpeteknikk AS | Wholesale & retail | 2017 |
| Solwang Eiendom AS | Real estate | 2018 |
| Soma Miljøkonsult AS | Education | 1998 |
| Someday Company AS | Information & communication | 2016 |
| Sommer & Vinter AS | Wholesale & retail | 2008 |
| Sos Media AS | Professional & scientific | 2022 |
| SP Renhold AS | Administrative & support | 2021 |
| Spa Aroma Jessheim AS | | 2026 |
| Spania Eiendom Invest AS | Real estate | 2023 |
| Spania Invest AS | Real estate | 2018 |
| Spelsberg Norge AS | Professional & scientific | 2018 |
| Spesialistsenteret for Kvinner AS | Health & social care | 2012 |
| Spinnwheel Records Inc AS | Information & communication | 2024 |
| Sport 1 AS | Wholesale & retail | 2002 |
| Sport Holding AS | Wholesale & retail | 2020 |
| Sport Holding IP AS | Wholesale & retail | 2019 |
| Sport Holding Logistikk AS | Transport & logistics | 2019 |
| Sport Holding Regnskap AS | Professional & scientific | 2000 |
| Sport Holding Retail AS | Wholesale & retail | 1999 |
| Sport Holding Retail Group AS | Wholesale & retail | 2021 |
| Sport Holding Retail Partner AS | Wholesale & retail | 2022 |
| Sportura AS | Wholesale & retail | 2025 |
| SQL Holding AS | Wholesale & retail | 2021 |
| Sraa Solution AS | Professional & scientific | 2010 |
| Stai Holding AS | | 2023 |
| Stallvegen Utvikling AS | Real estate | 2016 |
| Stasjonsdrift Singh AS | Wholesale & retail | 2020 |
| Stasjonsporten AS | Real estate | 2019 |
| Stavans Creative Solutions AS | Information & communication | 2025 |
| Stavmind AS | Information & communication | 2026 |
| Steelwrist AS | Wholesale & retail | 2017 |
| Stein Bygg Service AS | Construction | 2020 |
| Steinar Stolen Holding AS | Wholesale & retail | 2005 |
| Steinvollvegen Eiendomsutvikling AS | Real estate | 2023 |
| Stenerud Multiconsult AS | | 2026 |
| Stensbøl Invest AS | Real estate | 2017 |
| Stian Åsen Invest AS | | 2026 |
| Stillbygg AS | Administrative & support | 2019 |
| Stolen Eiendom AS | Real estate | 2006 |
| Stonewell AS | Information & communication | 2018 |
| Stordahl Group AS | Professional & scientific | 2026 |
| Storgata 162 AS | Real estate | 2014 |
| Storvika Gruppen AS | Wholesale & retail | 2026 |
| Strai Kjøkken Jessheim AS | Wholesale & retail | 2020 |
| Strandens AS | Construction | 2015 |
| Stride Oslo AS | Wholesale & retail | 2025 |
| Strodafredriksen Holding AS | | 2025 |