| Sani Resurs AS | Health & social care | 2014 |
| Santin AS | | 2022 |
| Sath Holding AS | | 2023 |
| Sce 276 Holding AS | | 2023 |
| Schiøtz Oppmåling AS | Professional & scientific | 1999 |
| SCM Consulting AS | Professional & scientific | 2006 |
| Scott Holding AS | Real estate | 2013 |
| Scott Management AS | Professional & scientific | 2013 |
| Seaseth AS | Financial services | 2016 |
| Secure Invest AS | Professional & scientific | 2005 |
| Sensualbliss AS | Wholesale & retail | 2023 |
| Sentrum Bakeri AS | Wholesale & retail | 2020 |
| Sentrum Regnskap & Revisjon AS | Professional & scientific | 1992 |
| Sentrumsbygget Kolbotn AS | Real estate | 2005 |
| Sesamy AS | Information & communication | 2023 |
| SHT Rådgivning AS | Professional & scientific | 2016 |
| Sigberge Invest AS | Real estate | 2013 |
| Sigma 3CK AS | Health & social care | 2012 |
| Sigma Eiendomsinvest AS | Real estate | 2013 |
| Sigur Innovasjon AS | Professional & scientific | 2022 |
| Sigur Technology AS | Professional & scientific | 2005 |
| Sigurd Bjørnstad AS | Real estate | 1967 |
| Sili AS | | 2024 |
| Sinusgruppen Eiendomsservice AS | Wholesale & retail | 2020 |
| Sinusgruppen Holding AS | Real estate | 2016 |
| Siricon AS | Professional & scientific | 2025 |
| Sirnes Invest AS | Financial services | 2005 |
| Sisca AS | Financial services | 2017 |
| Sjarm & Sjel AS | Wholesale & retail | 2008 |
| Skaidi AS | Professional & scientific | 2020 |
| Skardsvarden Invest AS | Transport & logistics | 2023 |
| Skarvøy Montasje AS | Construction | 2003 |
| Skifer Og Granitt Eiendom AS | Real estate | 2021 |
| Skilly AS | Construction | 2018 |
| Skippern Yachts AS | Transport & logistics | 2023 |
| Skiveien 42 AS | Real estate | 2011 |
| Skiveien 44 AS | Construction | 2014 |
| Skiveien 55 AS | Real estate | 2007 |
| Skiveien 57 AS | Real estate | 2007 |
| Skiveien 6 AS | Real estate | 2018 |
| Skjerven Creative AS | Information & communication | 2014 |
| Skogstrøm Invest AS | | 2022 |
| Skrettingland Prosjektledelse AS | Professional & scientific | 2022 |
| Skånevik Feriesenter AS | | 1993 |
| Smarketing AS | Information & communication | 2023 |
| Sne Studio AS | Information & communication | 2020 |
| Sniptind Capital AS | | 2023 |
| Sofiemyr Bil AS | Other services | 1997 |
| Sofiemyr Holding AS | Real estate | 2008 |
| Soki Consulting AS | Professional & scientific | 2023 |
| Solbakkens Gleder AS | Financial services | 2005 |
| Soleklar Invest AS | Professional & scientific | 2024 |
| Solgården Legesenter Da | Health & social care | 2001 |
| Solgården Tannhelse AS | Health & social care | 2023 |
| Soma Bygg AS | Construction | 2025 |
| Sovall Holding AS | | 2026 |
| Spikret AS | Real estate | 2021 |
| Spro Havn AS | Real estate | 2000 |
| Spro Havn Invest AS | Real estate | 2023 |
| SPV Alfa AS | Information & communication | 2016 |
| SPV Bravo AS | Information & communication | 2017 |
| SPV Charlie AS | Information & communication | 2017 |
| SPV Delta AS | Information & communication | 2015 |
| SR Eiendom AS | Real estate | 2004 |
| Stabekk Hudpleie AS | Other services | 2020 |
| Staben Holding AS | | 2019 |
| Standard Elektro AS | Construction | 1993 |
| Standard Regnskap AS | Professional & scientific | 2021 |
| Sted Helhet Arkitektur - Shark. AS | Professional & scientific | 2004 |
| Steinfoten AS | | 2025 |
| Stenbro Studios AS | Information & communication | 2026 |
| Stephan Nordnes Eriksen Holding AS | | 2020 |
| Stevning Consulting AS | Professional & scientific | 2024 |
| Stevning Holding AS | Financial services | 2006 |
| Stokkaasen AS | Real estate | 2017 |
| Stokker Holding AS | Wholesale & retail | 2005 |
| Storeide Holding AS | | 2023 |
| Storeng Invest AS | Information & communication | 2012 |
| Storkollen AS | Professional & scientific | 2019 |
| STS AS | Real estate | 2010 |
| Studio by KK Rygge AS | Wholesale & retail | 2024 |
| Studio by KK Torget AS | Wholesale & retail | 2024 |
| Studio Ess AS | Professional & scientific | 2023 |
| Studio Søyland AS | Health & social care | 2025 |
| Style Agency AS | Wholesale & retail | 2016 |
| Stylescape AS | Wholesale & retail | 2024 |
| Stålmontasje Øst AS | Construction | 2024 |
| Superroti AS | Financial services | 2017 |
| Suppli AS | Information & communication | 2022 |
| Sushi & Wok Express AS | Hospitality | 2014 |
| Svith Invest AS | | 2025 |
| Swip Da | Information & communication | 2024 |
| Synkia AS | Professional & scientific | 2004 |
| Sætreveien 1 AS | Real estate | 2019 |
| T M Eliassen Holding AS | Professional & scientific | 2008 |
| T. Veflen AS | Professional & scientific | 2005 |
| T. Veflen Prosjekt AS | Professional & scientific | 2013 |
| Tannlege Mie K. Midtgarden AS | Health & social care | 2020 |
| Tannlegeriet Liabø AS | Health & social care | 1997 |
| Taxi Plus AS | Transport & logistics | 2022 |