| SKS Pool AS | Transport & logistics | 2015 |
| SKS Tankers Holding AS | Transport & logistics | 2008 |
| Sku 10 AS | Financial services | 2013 |
| Skulstad AS | Health & social care | 2015 |
| Skuten 2 AS | Real estate | 2016 |
| Skuteviken Eiendom AS | Real estate | 2006 |
| Skuteviken Personell AS | Administrative & support | 2008 |
| Skuteviken Smalgang 11 AS | Real estate | 2020 |
| Skuteviken Utleie AS | Real estate | 2014 |
| Skuteviksboden 7-8 AS | Real estate | 2018 |
| Skuteviksboder 1-2 AS | Real estate | 2007 |
| Skuteviksboder 10-12 AS | Real estate | 2018 |
| Skuteviksboder 17 AS | Real estate | 2007 |
| Skuteviksboder 18 - 19 AS | Real estate | 1974 |
| Skuteviksboder 22 AS | Real estate | 2008 |
| Skuteviksboder AS | Real estate | 1999 |
| Skutevikstorget 1 AS | Real estate | 2013 |
| Skuteviksveien 51 AS | Real estate | 2012 |
| Skuteviksveien AS | Real estate | 2008 |
| Sky Labs AS | Information & communication | 2009 |
| Sky Media AS | Administrative & support | 2022 |
| Sky Stryketrio Da | Arts & recreation | 2025 |
| Skyen AS | Information & communication | 2017 |
| Skyen I Byen AS | Wholesale & retail | 2016 |
| Skyggen Holding AS | | 2024 |
| Skyggesiden AS | Professional & scientific | 2025 |
| Skyggespel Produksjoner AS | Arts & recreation | 2025 |
| Skyline Cleaning Systems AS | Administrative & support | 2025 |
| Skyra AS | Information & communication | 2023 |
| Skyskraperen Restaurant AS | Hospitality | 2016 |
| Skyttel AS | Information & communication | 1953 |
| Skyttelpass AS | Administrative & support | 2019 |
| Skywagon Norway AS | Administrative & support | 2020 |
| Skånevik Utvikling AS | Real estate | 2022 |
| Skår & Gundersen Karosseri AS | Other services | 1983 |
| SL 4 Næring 2 AS | Real estate | 2019 |
| SL 4 Næring 3 AS | Real estate | 2019 |
| SL 4 Næring 5 AS | Real estate | 2019 |
| Slaamaskin Da | Information & communication | 2018 |
| Slengesol Lakk & Karosseri AS | Other services | 2017 |
| Slettebakken Arena Aksjeselskap | Arts & recreation | 2025 |
| Slettebakken Frivilligsentral AS | Health & social care | 2023 |
| Slettebakken Legesenter Da | Health & social care | 1997 |
| Slettebakken Menighets Barnehage AS | Education | 2016 |
| Slettebakksveien 100 AS | Households | 1959 |
| Slettebakksveien 28 AS | Real estate | 2017 |
| Slettebrekkdalen 1 AS | Real estate | 2011 |
| Sletten Allmennpraksis Da | Health & social care | 2007 |
| Sletten Fargehandel AS | Wholesale & retail | 1990 |
| Sletten Fysioterapi Da | Health & social care | 2018 |
| Slettestrandveien 15 AS | Real estate | 1911 |
| Slomosa AS | Arts & recreation | 2022 |
| Slow and Steady AS | Information & communication | 2026 |
| Sloy AS | Administrative & support | 2025 |
| SLS Group AS | | 2025 |
| Slåtthaugvegen 17 AS | Real estate | 1998 |
| Smada Holding AS | | 2025 |
| Smallb Holding AS | | 2022 |
| Smart Seafood AS | Wholesale & retail | 2022 |
| Smarte Mål AS | Education | 2024 |
| Smartinvest AS | | 2022 |
| Smartroom AS | Construction | 2024 |
| Smashburger AS | Hospitality | 2025 |
| Smau Media AS | Information & communication | 2014 |
| Smauet Eiendom AS | Real estate | 2011 |
| Smcd AS | | 2019 |
| Sme Solutions AS | | 2020 |
| Smedsvig Eiendom AS | | 1989 |
| Smedsvig Landskapsarkitekter AS | Professional & scientific | 2017 |
| Smestad Holding AS | | 2005 |
| Smidig AS | Other services | 2016 |
| Smisi Hospitality AS | Hospitality | 2020 |
| Smith-Sivertsen Eiendom AS | Real estate | 2020 |
| SML Invest AS | | 2020 |
| SMP C Holding AS | Professional & scientific | 2019 |
| Smuud AS | Information & communication | 2024 |
| Små Frø AS | Financial services | 2017 |
| Smådøla Kraft AS | Energy | 2004 |
| Småkraft AS | Energy | 2002 |
| Småkraft Green Bond 1 AS | Energy | 2018 |
| Småkraft Uspp 1 AS | Energy | 2022 |
| Småkraft Vekst 2025 AS | Energy | 2023 |
| Småkraft Vekst 2026 AS | Energy | 2023 |
| Småkraft Vekst 2027 AS | Energy | 2025 |
| Småstrandgt. 6 AS | Real estate | 2017 |
| Smørbukk AS | Financial services | 2017 |
| Smøråsgården AS | Real estate | 1997 |
| SNAKEKING56 AS | | 2023 |
| Snapbooks AS | Information & communication | 2018 |
| Snedig AS | Hospitality | 2013 |
| Snedig Design AS | Professional & scientific | 1997 |
| Snesa Holding AS | | 2022 |
| Snincak Holding AS | Real estate | 2002 |
| Snos Sundt AS | Wholesale & retail | 2025 |
| Snow Cannon Games AS | Information & communication | 2015 |
| Snowcell AS | Information & communication | 2024 |
| Snute Og Pote Ans | Other services | 2005 |
| Snølys Design AS | Professional & scientific | 2017 |
| Snøstorm AS | | 2020 |
| So Far So Good AS | Professional & scientific | 2018 |