| Schultz Salg AS | Administrative & support | 2014 |
| Seasystems AS | Wholesale & retail | 1965 |
| Secure Edge AS | Information & communication | 2024 |
| Select Eiendom AS | Real estate | 2025 |
| Sentire AS | Education | 2024 |
| Sentire Holding AS | Wholesale & retail | 2023 |
| Servicemannen AS | Administrative & support | 2024 |
| SG VVS AS | Construction | 2024 |
| SGK AS | Construction | 2023 |
| Sheep Chase AS | Information & communication | 2025 |
| Sho Cafe AS | Hospitality | 2026 |
| Siara Solutions AS | Information & communication | 2022 |
| Siha Investeringer AS | Real estate | 2024 |
| Simen Hoels Gate AS | Real estate | 2021 |
| Sixpence Invest AS | | 2020 |
| SK Bygg Og Eiendom AS | Real estate | 2019 |
| Skar Advokater AS | Professional & scientific | 2023 |
| Skarpnes Invest AS | | 2025 |
| Skaug Entreprenør AS | Construction | 2026 |
| Skeidar Holding AS | Wholesale & retail | 2024 |
| Skeidar Retail AS | Wholesale & retail | 2016 |
| Skeidar Supply Chain AS | Wholesale & retail | 1993 |
| Skiltmannen AS | Professional & scientific | 2026 |
| Skiold Eiendom AS | Real estate | 2016 |
| Skiold Næring AS | Real estate | 2020 |
| Skjellumfjellet Vann- Og Avløp SA | Water & waste | 2002 |
| SL Gruppen Eiendom AS | Administrative & support | 2020 |
| SL Totalentrepenør AS | Construction | 2020 |
| SLG Logistikk AS | Transport & logistics | 2023 |
| SLG Norge AS | Wholesale & retail | 2024 |
| Smaalenene Eiendom AS | Real estate | 2010 |
| Small AS | | 2025 |
| Sol-Bygg AS | Real estate | 2019 |
| Sole Bolig AS | Real estate | 1999 |
| Sole Skog Barnehage AS | Education | 2022 |
| Sole Tjenester AS | Administrative & support | 2005 |
| Solem Drift & Vedlikehold AS | Administrative & support | 2024 |
| Sollibråten Drift Og Vedlikehold AS | Administrative & support | 2024 |
| Sollys AS | Hospitality | 2017 |
| Solveien 52 AS | Real estate | 2001 |
| Son Bilservice AS | Transport & logistics | 2000 |
| Soul AS | Administrative & support | 2022 |
| Special Events Da | Arts & recreation | 2006 |
| Spero AS | Administrative & support | 2022 |
| Sportwagen AS | Wholesale & retail | 2005 |
| Sportwagen Verksted AS | Other services | 2023 |
| Sro Teknikk AS | Professional & scientific | 2022 |
| Stangnes Marineservice AS | Manufacturing | 2012 |
| Stordal Gruppen AS | Real estate | 2022 |
| Storgata 17 Son AS | Real estate | 2003 |
| Storgata 31 Son AS | Real estate | 2022 |
| Stormåsan 12 AS | Real estate | 2018 |
| Storo Invest AS | Real estate | 1990 |
| Storybox AS | Wholesale & retail | 2021 |
| Strand Eiendom AS | Real estate | 1971 |
| Strand Engineering AS | Information & communication | 2020 |
| Strand-Holding AS | Wholesale & retail | 2005 |
| Strandco AS | Wholesale & retail | 1980 |
| STS Eiendomsselskap AS | Real estate | 2012 |
| Style Auto AS | Wholesale & retail | 1985 |
| Style Auto Bilsalg AS | Other services | 1982 |
| Suksess I Utdanning AS | Education | 2020 |
| Sundby Gård AS | Real estate | 2017 |
| Sunrise Medical AS | Wholesale & retail | 1993 |
| Supreme AS | Wholesale & retail | 2019 |
| Svendsen & Breivik Eiendom AS | Real estate | 1991 |
| SVENSKA SCM Avdeling i Norge NUF | Arts & recreation | 1995 |
| Swenor Maskin AS | Wholesale & retail | 2025 |
| Syncrolift AS | Professional & scientific | 1986 |
| Sønsteby Ans | Agriculture & fishing | 2000 |
| T.R.W Holding AS | Real estate | 2023 |
| Ta Drift AS | Construction | 2017 |
| Takstmann Og Tømrermester Jarle Torp AS | Real estate | 2025 |
| Tangen AS | Real estate | 2015 |
| Tannum Gård Da | Agriculture & fishing | 1994 |
| Tbali Invest AS | | 2023 |
| Techfab AS | Information & communication | 2021 |
| Tecta AS | Construction | 2015 |
| Tecta Prosjekt AS | Construction | 2016 |
| Tecta Tak AS | Construction | 2015 |
| Teigland Naprapati AS | Health & social care | 2023 |
| Tempura House AS | Hospitality | 2022 |
| Terjer Eiendomselskap AS | Real estate | 2004 |
| Terrasse Teknikk Da | Construction | 2026 |
| The Athletic Movement AS | Arts & recreation | 2022 |
| Thomassen Mekaniske AS | Manufacturing | 2019 |
| Tilbolig AS | Wholesale & retail | 2025 |
| Tip Trailer Services Norway Ans | Administrative & support | 1997 |
| Tirama Invest AS | Financial services | 2005 |
| Tlangholen Invest AS | Financial services | 2015 |
| Toe Prosjekt AS | Real estate | 2006 |
| Tommy Hilfiger Stores Norge AS | Wholesale & retail | 2010 |
| Torak Holding AS | Administrative & support | 2017 |
| Torbjørn Køhler AS | | 2023 |
| Trafikkskole Vestby AS | Education | 2014 |
| Trailx Norge Da | Other services | 2007 |
| Transportwagen AS | Wholesale & retail | 2025 |
| Troll Salmon AS | Manufacturing | 1987 |
| Trollfelt Vestby AS | Real estate | 2018 |
| Tronstad Utvikling AS | Real estate | 2021 |