| Smarte Investeringer AS | | 2023 |
| Smash Buddies Ski AS | Hospitality | 2024 |
| Smedsrud Grendelag SA | Other services | 1986 |
| Snare Boligvurdering AS | Real estate | 2022 |
| Snotra Eiendom AS | Real estate | 2016 |
| Snurr Ski AS | Manufacturing | 2023 |
| Solbakk AS | Education | 2012 |
| Soleveien 2 AS | Real estate | 1982 |
| Soleveien Utbygging AS | Real estate | 2018 |
| Solhaug Byggservice AS | Construction | 2022 |
| Solhesten AS | Professional & scientific | 2019 |
| Solid Rivetjenester AS | Construction | 2023 |
| Solid Trafikkskole AS | Education | 2025 |
| Solid Tømrerservice AS | Construction | 2011 |
| Solskinnsmureren Jakt- Og Fiskecamp AS | Arts & recreation | 2026 |
| Solskjerming Østlandet AS | Wholesale & retail | 2023 |
| Something New AS | Wholesale & retail | 2005 |
| Soon Slipp Invest AS | Financial services | 2020 |
| Soot Regnskap AS | Professional & scientific | 2016 |
| Sorgløs Holding AS | | 2021 |
| Soulville AS | Administrative & support | 2020 |
| SP Drift Og Vedlikehold AS | Real estate | 2023 |
| SP Eiendom AS | Real estate | 2007 |
| Sparta Treningssenter AS | Arts & recreation | 2015 |
| Spe Futuri AS | | 2018 |
| Speditøren AS | Transport & logistics | 1983 |
| Speratus AS | Information & communication | 2017 |
| Spesialfelger AS | Wholesale & retail | 1980 |
| Spetaclus AS | Professional & scientific | 2021 |
| Spinke AS | Construction | 2018 |
| Spjudvik Regnskap AS | Professional & scientific | 2014 |
| Spring Management AS | Professional & scientific | 2025 |
| Srb-Holding AS | | 2025 |
| Ssgw Invest AS | | 2025 |
| ST. Halvardsgate 67 AS | Real estate | 2013 |
| ST. Tropez Tanning Shop Da | Other services | 2004 |
| Staal Consulting AS | Professional & scientific | 2014 |
| Staging AS | | 2026 |
| Stall Sandvoll AS | Education | 2022 |
| Stasjons Puben AS | Hospitality | 2013 |
| Stasjonskvartalet AS | Real estate | 2019 |
| Steenstrup 4 AS | Real estate | 2026 |
| Steigen Invest AS | | 2020 |
| Steinar Jordet AS | Wholesale & retail | 2024 |
| Steinar Nord Holding AS | | 2023 |
| Steinsenteret Ski AS | Wholesale & retail | 2005 |
| Steinteig Invest AS | Professional & scientific | 1993 |
| Stellar Music AS | Arts & recreation | 2023 |
| Stenersen Invest AS | Real estate | 2020 |
| Stensenteret AS | Manufacturing | 1985 |
| Sterner AS | Wholesale & retail | 1990 |
| Sterner Group AS | Wholesale & retail | 2001 |
| Sterner Seafood AS | Wholesale & retail | 2021 |
| Stian Landbakk AS | Wholesale & retail | 2004 |
| Stians Trafikkskole AS | Education | 2015 |
| Stil Invest AS | Real estate | 1985 |
| Stil Invest Bolig AS | Real estate | 2022 |
| Stil Tekstilservice AS | Other services | 2004 |
| Stockhamn Invest AS | | 2025 |
| Stokkis Holding & Invest AS | | 2024 |
| Stone Capital AS | Real estate | 2006 |
| Stonkeykong Holding AS | | 2019 |
| Stop and Go - Danielsen Consulting Nuf | Professional & scientific | 2009 |
| Stop and Go Danielsen Consulting AS | Professional & scientific | 2025 |
| Stork Hageservice AS | Administrative & support | 2022 |
| Stork Holding AS | Administrative & support | 2019 |
| Storsenteret Legekontor Da | Health & social care | 2015 |
| Storskringen AS | | 2021 |
| Stray-Jansen Holding AS | | 2023 |
| Stretch Wrap Norway AS | Wholesale & retail | 2019 |
| Strong Management AS | Real estate | 2018 |
| Strømland AS | Financial services | 2013 |
| Stubben Invest AS | Real estate | 2009 |
| Studio Aadalen AS | Professional & scientific | 2014 |
| Studio Alf Ski AS | Other services | 2004 |
| Studio for Men AS | Other services | 2019 |
| Styrvold Consulting AS | Professional & scientific | 2019 |
| Substrate AS | | 2025 |
| Sultan Tandoori AS | Hospitality | 2017 |
| Sundrehagen AS | | 2024 |
| Sunio Legesenter AS | Health & social care | 2023 |
| Sunquest Travel Norge AS | Administrative & support | 1994 |
| Supercuts AS | Other services | 2010 |
| Superfast Holding AS | | 2026 |
| Sushi House Restaurant & Bar AS | Hospitality | 2022 |
| Sushi Søstre 1 AS | Hospitality | 2026 |
| Sushi Søstre AS | Hospitality | 2012 |
| Svanta AS | Real estate | 2022 |
| Svarbar AS | Information & communication | 2026 |
| Svarthol Holding AS | | 2023 |
| Svein Grøstad AS | Construction | 1997 |
| Svein Kaldahl AS | Information & communication | 2025 |
| Sweetspot Group AS | Arts & recreation | 2023 |
| Syprian AS | | 2019 |
| Syrin Holding AS | | 2026 |
| Sysinn.No AS | Information & communication | 2025 |
| Ski Elektriske Installasjon A/S | Construction | 1988 |
| Steens Fornikling A/S | Real estate | 1975 |
| Sålekinna Finans AS | Financial services | 2015 |
| Sæthren & Wraamann AS | Manufacturing | 1969 |