| Senrivest AS | | 2003 |
| Senseloop AS | Information & communication | 2017 |
| Senseloop Holding AS | Information & communication | 2019 |
| Service Invest AS | Real estate | 1985 |
| Shahram Yalda AS | Health & social care | 2022 |
| Sheilas Beauty AS | Other services | 2025 |
| Sigurd Jensen AS | Real estate | 1957 |
| Sildafjord AS | | 2023 |
| Silje Tolo AS | | 2021 |
| Simen Kind Gulbrandsen Holding AS | Information & communication | 2022 |
| Sinclair Innovation AS | Professional & scientific | 2021 |
| Sino-Nordic Alliance AS | | 2011 |
| Sirius Business Consultants AS | Professional & scientific | 1994 |
| Sitor Eiendom AS | Professional & scientific | 1988 |
| Sjø & Ski AS | Arts & recreation | 1997 |
| Sjølyst Bil Og Båt AS | Wholesale & retail | 1995 |
| Skaarungen AS | Wholesale & retail | 1995 |
| Skandinavisk Rør AS | Administrative & support | 2013 |
| Skansen Capital AS | Real estate | 2005 |
| SKM Tømrer Bygg AS | Construction | 2025 |
| Skogstien 21 AS | Real estate | 2021 |
| Skranglejazz AS | Arts & recreation | 2018 |
| Skredderstolpe AS | Professional & scientific | 2011 |
| SKS AS | Hospitality | 2023 |
| Skymoen Holding AS | Financial services | 2017 |
| Sletterødåsen Boligutvikling AS | Real estate | 2008 |
| Sletterødåsen Holding AS | Real estate | 2022 |
| Smartass Consulting AS | Professional & scientific | 2020 |
| Smarthandlings AS | Other services | 2015 |
| Smilet Tannklinikk AS | Health & social care | 2013 |
| SMT Invest AS | | 2023 |
| Snoveien Høvik AS | Real estate | 2021 |
| Snusfondet AS | Financial services | 2021 |
| Snøtind AS | Financial services | 2005 |
| Soleglad Holding AS | Real estate | 2014 |
| Solemworks AS | Professional & scientific | 2024 |
| Solice AS | Wholesale & retail | 2018 |
| Sommerborg AS | Manufacturing | 2018 |
| Sonic Agency AS | Wholesale & retail | 2017 |
| Sonic Labels AS | Wholesale & retail | 2018 |
| Southern Cross Spars AS | Manufacturing | 2004 |
| Spain Holiday Online Rentals SL | Administrative & support | 2010 |
| Sparkle AS | Administrative & support | 2022 |
| Speed Consulting AS | Information & communication | 2026 |
| Spenn AS | Financial services | 2012 |
| Spikes AS | | 2026 |
| Spitsbergen Invest AS | Professional & scientific | 2007 |
| Spoton Transport AS | Transport & logistics | 2012 |
| Sprint Eiendom AS | Real estate | 2017 |
| Staalesen Bygg AS | Construction | 2018 |
| Stabbestein AS | Transport & logistics | 2022 |
| Stabekk Bolig AS | | 2021 |
| Stack Seven AS | Information & communication | 2026 |
| Standout Designs AS | Professional & scientific | 2024 |
| Stang Media AS | Information & communication | 2007 |
| Stange-Rognøy Holding AS | | 2013 |
| Stardust AS | Real estate | 2016 |
| Steinto Holding AS | | 2024 |
| Stella Holding AS | Real estate | 2005 |
| Stjernholm AS | Professional & scientific | 2024 |
| Stokvis Tapes Norge AS | Wholesale & retail | 1999 |
| Stoppenkollen AS | Real estate | 2018 |
| Storagebox AS | Real estate | 2021 |
| Store Hasleberg AS | Financial services | 2006 |
| Storemyr Eiendom AS | Real estate | 2007 |
| Storkjøkkenforum AS | Hospitality | 2020 |
| Stormanger Invest AS | Real estate | 2020 |
| Stormangero AS | Professional & scientific | 2020 |
| Storskrymten AS | Financial services | 2006 |
| Stortorvet Holding AS | Financial services | 2005 |
| Storylab Ans | Professional & scientific | 2004 |
| Strandveien 103 AS | Real estate | 2020 |
| Strikkesalongen AS | Professional & scientific | 1999 |
| Stråle AS | Transport & logistics | 2022 |
| Sundem Holding AS | Real estate | 1991 |
| Sundin Invest AS | | 2023 |
| Susann Gjerde AS | Professional & scientific | 2008 |
| Sushi Huset AS | Hospitality | 2025 |
| Svartskjær AS | Financial services | 2015 |
| SVL AS | Financial services | 2017 |
| Swe-Ger AS | Information & communication | 2026 |
| Synité AS | Professional & scientific | 2025 |
| T & G Elektro AS | Manufacturing | 2003 |
| Tabio Holding AS | | 2022 |
| Tale Technologies AS | Information & communication | 2026 |
| Tales Holding AS | | 2024 |
| Tann- Kjeve Og Ansiktskirurgisk Klinikk AS | Health & social care | 2013 |
| Tanngalleriet AS | Health & social care | 2014 |
| Tannlege Mariann Westgaard AS | Health & social care | 2009 |
| TEACH4TWO AS | Information & communication | 2020 |
| Teceb AS | Financial services | 2008 |
| Tech Stew AS | Information & communication | 2017 |
| Technical Consulting AS | Professional & scientific | 2000 |
| Tecot AS | Financial services | 2016 |
| Tempo Consult AS | Real estate | 2005 |
| Tendenzer AS | Wholesale & retail | 2000 |
| Terra Eiendomsutvikling AS | Real estate | 1996 |
| Terrasseveien 38 AS | Real estate | 2015 |
| Tesserakt AS | Professional & scientific | 2025 |
| The Bakers AS | Manufacturing | 2025 |