| Seabrokers Heavy Machinery AS | Administrative & support | 2013 |
| Seabrokers Holding AS | Construction | 2002 |
| Seabrokers Innovation AS | Professional & scientific | 2023 |
| Seabrokers Services AS | Real estate | 1991 |
| Seadrill Europe Management AS | Administrative & support | 2011 |
| Seadrill Insurance Ltd | | 1997 |
| Seadrill Norway Crew AS | Administrative & support | 2011 |
| Seadrill Norway Operations Ltd. Nuf | Mining & quarrying | 2011 |
| Seadrill Offshore AS | Mining & quarrying | 1972 |
| Seadrill UK Operations Ltd | Administrative & support | 2017 |
| Seafarming Systems AS | Professional & scientific | 2016 |
| Seaking Invest AS | Real estate | 2001 |
| Seamoore Holding AS | Real estate | 2011 |
| Seapoint AS | Information & communication | 2026 |
| Seaview Invest AS | Real estate | 2006 |
| Seb Investering AS | | 2025 |
| Sebsan AS | Financial services | 2017 |
| Secant Stavanger AS | Professional & scientific | 2023 |
| Seci Holding AS | | 2026 |
| Second Securities AS | Financial services | 2011 |
| Seconsult AS | Professional & scientific | 2024 |
| Securient AS | Professional & scientific | 2024 |
| Seddel Investering AS | | 2021 |
| Sedox Eiendom AS | Real estate | 2011 |
| Seedling AS | Real estate | 2020 |
| Seehusens Gate 1 AS | Real estate | 2004 |
| Seeker AS | Manufacturing | 2002 |
| Sees Invest AS | Professional & scientific | 2021 |
| Sef Performance AS | | 2025 |
| Segbåss AS | Financial services | 2017 |
| Segelstein Bemanning AS | Administrative & support | 2026 |
| Segelstein Holding AS | | 2026 |
| Seger Holding AS | Financial services | 2017 |
| Segwell AS | Health & social care | 2014 |
| Seid Eiendom AS | Real estate | 2021 |
| Seiik AS | Information & communication | 2026 |
| Seilmaker H K Mathiesen AS | Manufacturing | 1974 |
| Seisedge AS | Professional & scientific | 2020 |
| Sekal AS | Professional & scientific | 2011 |
| Seko Elektroteknikk AS | Manufacturing | 1972 |
| Sekse Finans AS | Real estate | 2008 |
| Sektor Eiendom AS | Professional & scientific | 1960 |
| Sektor F 23 AS | Real estate | 2008 |
| Sektor L 23 AS | Real estate | 2008 |
| Sektor M 24-26 AS | Real estate | 2001 |
| Sektor M 28 AS | Real estate | 2017 |
| Selar AS | Professional & scientific | 2025 |
| Seldal Invest AS | Real estate | 2010 |
| Seldalsbakken Investering AS | | 2009 |
| Selland Holding AS | Professional & scientific | 2017 |
| Selma Kafe - Avd. Magasinblå AS | Hospitality | 2025 |
| Selvåg Invest AS | | 2010 |
| Selvåg Og Sondresen Eiendom AS | Real estate | 2021 |
| Sema AS | Real estate | 1984 |
| Semper Anticus Invest AS | | 2023 |
| Sendo AS | Information & communication | 2010 |
| Senova Team AS | Professional & scientific | 2025 |
| Sense of Science AS | Education | 2013 |
| Sensocean AS | Information & communication | 2022 |
| Sensortech Holding AS | | 2020 |
| Sensum AS | Professional & scientific | 2009 |
| Senter for Tilpasset Opplæring AS | Health & social care | 2011 |
| Senteret Gamle Bryne Mek AS | Real estate | 2005 |
| Sentir AS | Professional & scientific | 2017 |
| Sentris AS | Real estate | 2025 |
| Sentrum Kinamat AS | Hospitality | 2016 |
| Sentrum Sykkelverksted Stavanger AS | Wholesale & retail | 2024 |
| Senz AS | Professional & scientific | 2011 |
| Seoul Holding AS | Hospitality | 2023 |
| Seoul Søstre AS | Hospitality | 2023 |
| Sep Invest AS | Hospitality | 2022 |
| Sepio Holding AS | | 2017 |
| Sequoia Holding AS | | 2025 |
| Serad Eiendom AS | Real estate | 1994 |
| Serene Holding AS | Health & social care | 2024 |
| Serenity Hudpleie AS | Other services | 2017 |
| Serico Reklame AS | Wholesale & retail | 2002 |
| Serimax Limited Nuf | Manufacturing | 1996 |
| Serratula AS | Real estate | 2015 |
| Sertifiseringsorganet for Sakkyndig Virksomhet AS | Professional & scientific | 1999 |
| Service Rørleggeren AS | Real estate | 2001 |
| Servicesystemer AS | Information & communication | 1996 |
| Servo Hage AS | Other services | 2021 |
| Sess Holding AS | | 2022 |
| Session Arkaden AS | Wholesale & retail | 2007 |
| Session Bergen AS | Wholesale & retail | 2001 |
| Session Drift AS | Professional & scientific | 2010 |
| Session Haugesund AS | Wholesale & retail | 2003 |
| Session Kristiansand AS | Wholesale & retail | 2008 |
| Session Kvadrat AS | Wholesale & retail | 2002 |
| Session Lagunen AS | Wholesale & retail | 2010 |
| Session Sandvika AS | Wholesale & retail | 2003 |
| Session Stavanger AS | Wholesale & retail | 1996 |
| Session Strømmen AS | Wholesale & retail | 2006 |
| Setho AS | | 2016 |
| Settco AS | | 2022 |
| Sevan Drilling Limited Nuf | Administrative & support | 2008 |
| Seven Salim AS | Wholesale & retail | 2023 |
| Sevensix AS | Information & communication | 2017 |
| Sevvo AS | Administrative & support | 2025 |