| Societe De Gestion De L'Echappee | Arts & recreation | 2024 |
| Sol Management AS | Real estate | 2004 |
| Solai Holding AS | | 2023 |
| Solberglia Eiendom AS | Construction | 2017 |
| Soleil Invest AS | | 2021 |
| Solinova AS | Professional & scientific | 2006 |
| Sollan-Rom for Arbeidsglede Da | Education | 2005 |
| Solli & Partnere AS | Real estate | 2005 |
| Solli Skianlegg SA | Arts & recreation | 2006 |
| Solro AS | Real estate | 2005 |
| Solunn AS | Professional & scientific | 2005 |
| Someone AS | Information & communication | 2001 |
| Somle AS | | 2024 |
| Sondre & Tanya AS | Arts & recreation | 2022 |
| Sondre Events AS | Education | 2024 |
| Sonro AS | Financial services | 1997 |
| Soundscape AS | Wholesale & retail | 2017 |
| Southwest Sub AS | Hospitality | 2019 |
| Sozzled Capital Management AS | | 2023 |
| Sparks AS | Professional & scientific | 2014 |
| Spartoi AS | | 2021 |
| SPD Teknologier AS | Professional & scientific | 2025 |
| Special Service Company AS | Administrative & support | 2014 |
| Special Service Norge AS | Administrative & support | 2019 |
| Speedproducts AS | Wholesale & retail | 2015 |
| Speedway Consult AS | Professional & scientific | 2012 |
| Spina Holding AS | Health & social care | 2021 |
| Spirit Consulting AS | Information & communication | 2020 |
| Spis Riktig AS | Hospitality | 2015 |
| Spons.Gg AS | Information & communication | 2024 |
| Sporten Elektriske AS | Wholesale & retail | 1983 |
| Sportmarket Nordic AS | Wholesale & retail | 2011 |
| Sprell Invest AS | | 2018 |
| Squarepoint Services International Limited Nuf | Information & communication | 2022 |
| SRS Maskin & Landbruk AS | Construction | 2018 |
| ST Bergestuen AS | Arts & recreation | 2015 |
| Stadsnes Holding AS | Financial services | 2016 |
| Stagetech AS | Financial services | 2005 |
| Stalheim Invest AS | | 2016 |
| Standard Garanti Forsikring AS | Administrative & support | 2016 |
| Stanley Bygg AS | Construction | 2017 |
| Stanley Holding AS | Real estate | 2025 |
| Stark Capital AS | | 2021 |
| Stasjonskvartalene AS | Real estate | 1995 |
| Stasjonsveien 65 AS | Real estate | 2015 |
| State Street Global Advisors Limited | Professional & scientific | 2023 |
| Steinfjellet Invest AS | Real estate | 2023 |
| Steingardr AS | | 2021 |
| Steinseth AS | Manufacturing | 1988 |
| Stenvaag Holding AS | | 2005 |
| Stern Holding AS | | 2023 |
| Stickfigure Consulting AS | Information & communication | 2015 |
| Stig a. Bruset AS | Education | 1998 |
| Stig Slorafoss Holding AS | Financial services | 2017 |
| Stiro AS | Financial services | 2006 |
| Stop Stop AS | Professional & scientific | 2019 |
| Storageco AS | Real estate | 2019 |
| Storageco Eiendom AS | Real estate | 2018 |
| Storegut Holding AS | Real estate | 2022 |
| Straa Frisørene Asker AS | Other services | 1982 |
| Strada Morello AS | Professional & scientific | 2016 |
| Strai Kjøkken Asker AS | Wholesale & retail | 2003 |
| Strand Data AS | Information & communication | 1984 |
| Stranda Vann & Avløp SA | Water & waste | 2010 |
| Strategic Consulting Group AS | Professional & scientific | 2016 |
| Strila Drift AS | Real estate | 2024 |
| Studio 23 AS | Arts & recreation | 2018 |
| Studio Form AS | Wholesale & retail | 2014 |
| Styria AS | Information & communication | 2007 |
| Stående Applaus AS | Construction | 2018 |
| Sudndalen Eiendom AS | Real estate | 2005 |
| Suit Supply Norway AS | Manufacturing | 2015 |
| Sulzer Pumps Wastewater Norway AS | Wholesale & retail | 1977 |
| Sunstone Reach AS | Health & social care | 2023 |
| Superbasket Plastic Group AS | Wholesale & retail | 2000 |
| Supernova AS | | 2024 |
| Surlien Management AS | Professional & scientific | 2012 |
| Sushi Senter Asker AS | Hospitality | 2017 |
| Suum AS | Real estate | 2020 |
| Svaco AS | Real estate | 2012 |
| Svart Invest AS | | 2021 |
| Svenner AS | | 2022 |
| Svensk Forretningspartner AS | Wholesale & retail | 2022 |
| Swereco AS | Wholesale & retail | 2022 |
| Symra Invest AS | | 2019 |
| Synhovd AS | | 2026 |
| Syningen AS | Real estate | 1997 |
| Syretårnet 37 AS | Real estate | 2012 |
| Systemvent AS | Construction | 2024 |
| Syverstadkollen AS | Real estate | 2012 |
| Scan Coin A/S | Wholesale & retail | 1983 |
| Service-Eksperten Vest AS | Other services | 1987 |
| SiSuSoft AS | Information & communication | 1987 |
| Sætre Gard AS | Real estate | 2007 |
| Sørestrandvegen 675 AS | Real estate | 2021 |
| Tafjord AS | Real estate | 2005 |
| Takeda AS | Wholesale & retail | 1998 |
| Takk Tikk Design Ans | Professional & scientific | 1992 |
| Takst Hegerland AS | Real estate | 2019 |
| Takst Og Konsulting AS | Real estate | 2026 |