| See Investment AS | | 2025 |
| See Utleie AS | Real estate | 2025 |
| Seim Holding AS | Financial services | 2005 |
| Seko Data AS | Information & communication | 2002 |
| Selgvia AS | Professional & scientific | 2026 |
| Selskapsservice.No AS | Hospitality | 2020 |
| Sendex AS | Transport & logistics | 2018 |
| Senter Bilpleie AS | Other services | 2022 |
| Sentrumsbygg AS | Real estate | 1997 |
| Seoulbeauty AS | Wholesale & retail | 2026 |
| Service Gruppen AS | Construction | 2019 |
| SERVICES4HIRE AS | Manufacturing | 2014 |
| Sev Consulting AS | Professional & scientific | 2021 |
| Shala Eiendommer AS | Real estate | 2024 |
| Shala Holding Group AS | | 2025 |
| Sham Bedriftsrådgiver AS | Professional & scientific | 2021 |
| Shawarma Raslani AS | Hospitality | 2024 |
| Shazbot! AS | Information & communication | 2024 |
| Shinehub AS | Wholesale & retail | 2026 |
| Sidhu Invest AS | Real estate | 2015 |
| Signaturklinikken AS | Other services | 2015 |
| Sika Invest AS | Real estate | 1987 |
| Sikra Sikkerhet AS | Construction | 2023 |
| Silasa Invest AS | Financial services | 2018 |
| Simple Solutions Transport AS | Transport & logistics | 2020 |
| Simplicatus Research and Development AS | Wholesale & retail | 2000 |
| Sinsenterrassen 14/16 Holding AS | Real estate | 2024 |
| Sinsenterrassen 14/16 Næring AS | Real estate | 2024 |
| Sirex AS | Professional & scientific | 2009 |
| Siso Consulting AS | Professional & scientific | 2021 |
| Siso Regnskap AS | Professional & scientific | 2023 |
| SJ Byggservice A/S | Real estate | 1988 |
| Sjovik AS | | 2020 |
| Skedsmo Bowling AS | Arts & recreation | 1993 |
| Skedsmo Eiendom AS | Real estate | 2011 |
| Skedsmo Fot Terapi AS | Health & social care | 2017 |
| Skedsmo Holding AS | Construction | 2005 |
| Skedsmo Parkering AS | Transport & logistics | 2004 |
| Skedsmo Rørleggerbedrift AS | Construction | 1997 |
| Skien Kraftproduksjon AS | Energy | 2003 |
| Skigarden AS | Professional & scientific | 2002 |
| Skillheart AS | Information & communication | 2014 |
| Skin Clinic Lillestrøm AS | Health & social care | 2013 |
| Skin Clinic Torvgata 11 AS | Health & social care | 2026 |
| Skjevik Holding AS | | 2026 |
| Skjølberg Invest AS | | 2021 |
| Skoglyfjellet Sør AS | Real estate | 2021 |
| Skovhuus Strik Norge AS | Wholesale & retail | 2003 |
| Skue Frakt AS | Transport & logistics | 2023 |
| Skuseth Media AS | Wholesale & retail | 2024 |
| Skut AS | Real estate | 2020 |
| Skyrocket AS | Arts & recreation | 2020 |
| Skyrud Invest AS | Professional & scientific | 1987 |
| Skårerbyen Næring 2 AS | Real estate | 2021 |
| Skårerbyen Næring AS | Real estate | 2021 |
| Skårersletta 80 AS | Real estate | 2005 |
| SL Kapital AS | Real estate | 2022 |
| Slettvoll Lillestrøm AS | Wholesale & retail | 2001 |
| SLM Revisjon AS | Professional & scientific | 1994 |
| Slynga 2 Eiendom AS | Real estate | 2008 |
| Smerteekspert AS | Wholesale & retail | 2026 |
| Smil-Foto AS | Professional & scientific | 2020 |
| Smith & Smule Marked Og Media Ans | Administrative & support | 1999 |
| Snare AS | Real estate | 1976 |
| Snare Invest AS | Real estate | 1990 |
| Sniff Snaff Snute AS | Professional & scientific | 2020 |
| Snikkerbua Holding AS | | 2021 |
| Snipp Og Snapp AS | Wholesale & retail | 2021 |
| Snu Eiendom AS | Real estate | 2025 |
| Software-Writer AS | | 1981 |
| Sogsti AS | Real estate | 2024 |
| Soleie AS | Energy | 2020 |
| Solgrid AS | Energy | 2019 |
| Solgrid Nordvi AS | Energy | 2023 |
| Solgrid Ørje AS | Energy | 2023 |
| Solhaugen Bygg AS | Construction | 2012 |
| Solheim Vinbar AS | Hospitality | 2013 |
| Solheimsgata 17 AS | Real estate | 2025 |
| Solheimsgata 18 AS | Real estate | 2021 |
| Solheimsgata 21 AS | Real estate | 2021 |
| Solheimsgt. 4 Eiendom Ans | Real estate | 2003 |
| Solid Advokat AS | Professional & scientific | 2023 |
| Solo Kran & Invest AS | Transport & logistics | 2012 |
| Solsiden Bar AS | Hospitality | 2021 |
| Sondresen Eiendom AS | Real estate | 2015 |
| Soulfood AS | Hospitality | 2023 |
| Speed Auto AS | Wholesale & retail | 2023 |
| Spekter Holding AS | | 2019 |
| Spira Nova AS | Professional & scientific | 2025 |
| Spireaveien 16 Eiendom AS | Real estate | 2002 |
| Sponsible AS | Professional & scientific | 2024 |
| SPORT4FUN AS | Education | 2021 |
| Squatra Capital AS | | 2024 |
| SRG Partner AS | Real estate | 2011 |
| SS Profil Og Yrkesklær AS | Manufacturing | 2006 |
| SS Sidhu Invest AS | Financial services | 2017 |
| ST. Mørkved AS | | 2025 |
| Stacked Accounting AS | Professional & scientific | 2025 |
| Stadig AS | Professional & scientific | 2023 |
| Stamstedet AS | Professional & scientific | 2026 |