| SD Forfuture AS | Wholesale & retail | 2019 |
| Sea Grown Vesterålen AS | Agriculture & fishing | 2015 |
| Seafoodnorway AS | Wholesale & retail | 2016 |
| Seksjon 4 AS | Real estate | 2005 |
| Sense-Tech AS | Wholesale & retail | 2023 |
| Senss Holding AS | | 2019 |
| Sentrumsveien 43 AS | Real estate | 2019 |
| Service Addiction AS | Professional & scientific | 2025 |
| Servico AS | Professional & scientific | 1989 |
| SFB Invest AS | Real estate | 2005 |
| SG Nordic Da | Information & communication | 2026 |
| Shooter AS | Wholesale & retail | 2021 |
| Silap AS | | 2017 |
| Simen Christensen Holding AS | | 2023 |
| Sirius Innovation AS | Professional & scientific | 2016 |
| Sissel Grana AS | Other services | 2008 |
| Siv Heleen Andersen AS | Wholesale & retail | 2005 |
| Sjø&Land AS | Construction | 2024 |
| Sjøsikta AS | Real estate | 2026 |
| Skagens Eiendom AS | Real estate | 2015 |
| Skallevold Holding AS | Real estate | 2005 |
| Skallevoldveien 32A AS | | 2014 |
| Skanke AS | Health & social care | 2023 |
| Skin Nurse AS | Health & social care | 2025 |
| Skipperkurs Forlag AS | Information & communication | 2016 |
| Skogenberget Eiendom AS | Real estate | 2019 |
| Skovly Invest AS | Wholesale & retail | 2025 |
| Sky Fitness Tjølling AS | Arts & recreation | 2017 |
| Slagen Bygg AS | Construction | 2022 |
| Slagen CF AS | Education | 2018 |
| Slagen Elektriske AS | Construction | 2007 |
| Slagen Holding AS | | 2026 |
| Slagen Legekontor Ans | Health & social care | 2004 |
| Slagen Multiservice Og Utleie AS | Administrative & support | 2022 |
| Slagen PT Og Trening AS | Arts & recreation | 2026 |
| Slagenpakkeriet AS | Real estate | 1993 |
| SMC Finance AS | Professional & scientific | 2005 |
| Smeg Eiendom AS | Professional & scientific | 2021 |
| Smidsrød AS | Health & social care | 2011 |
| Smo Entreprenør AS | Construction | 2025 |
| Smo Holding AS | Construction | 2024 |
| Sofaa Holding AS | Real estate | 2021 |
| Solid Design AS | Professional & scientific | 2005 |
| Sollia Invest AS | Real estate | 2002 |
| Soltoppen B3 AS | Real estate | 2020 |
| Solvang Engineering & Construction AS | Professional & scientific | 2006 |
| Sondre Evju AS | Construction | 2022 |
| Sparringspartner AS | Professional & scientific | 2019 |
| Spire Regnskap AS | Professional & scientific | 2024 |
| Spirea Investments AS | Professional & scientific | 2013 |
| Spjsworks AS | Information & communication | 2026 |
| SPZ Consulting AS | Professional & scientific | 2024 |
| Sramek Holding AS | Construction | 2000 |
| Stars Invest AS | Professional & scientific | 2015 |
| Stelo Consulting AS | Professional & scientific | 2026 |
| Stian Farmen Holding AS | Financial services | 2018 |
| Stokke Consulting AS | Professional & scientific | 2002 |
| Storbukås Advisory & Invest AS | Professional & scientific | 2026 |
| Storgaten 17 Horten AS | Real estate | 2014 |
| Storgaten 40 Tønsberg AS | Real estate | 2005 |
| Storgaten 42 Tønsberg AS | Real estate | 2010 |
| Stribolt Holding AS | Real estate | 2009 |
| Strøk Design AS | Professional & scientific | 2018 |
| Studio Pryd AS | Administrative & support | 2024 |
| Styrekompetanse AS | Professional & scientific | 1992 |
| Swenor Rail AS | Construction | 2017 |
| Synton AS | Professional & scientific | 2005 |
| Synton Eiendom AS | | 2018 |
| Skallevold Trevarefabrikk AS | Real estate | 1975 |
| Sølvposten Invest AS | Professional & scientific | 2006 |
| Søre Vegglifjell Hyttetomter AS | Administrative & support | 2020 |
| Sørsveen Holding AS | Real estate | 2006 |
| Sørvig AS | Construction | 2017 |
| T Myhre Holding AS | Financial services | 2005 |
| T.G.M. Holding AS | | 2008 |
| T.Johansen Holding AS | Information & communication | 2023 |
| Tallay Invest AS | | 2023 |
| Tapio's Brannservice AS | Education | 2017 |
| Tbbm Invest AS | | 2022 |
| Tema Forlag AS | Information & communication | 1987 |
| Tenk Fremtid AS | Education | 2021 |
| Terje Henden Holding AS | Real estate | 2012 |
| Terje Jacobsen Snekkerservice AS | Construction | 2012 |
| Tetona AS | Wholesale & retail | 2024 |
| Tha Gruppen AS | Professional & scientific | 1999 |
| Thibeko AS | Wholesale & retail | 2025 |
| Think Holding AS | Information & communication | 2021 |
| Thisted Holding AS | | 2020 |
| Tho Invest AS | Financial services | 2005 |
| Thon Analytics AS | Professional & scientific | 2025 |
| Thorstensen Eftf AS El Installatør | Construction | 1988 |
| Tia Holding AS | | 2023 |
| Tiltaksteam AS | Health & social care | 2016 |
| Tiltnes Holding AS | | 2025 |
| Timeto AS | Professional & scientific | 2005 |
| Titan Dynamics AS | Information & communication | 2023 |
| Titan Dynamics Holding AS | Information & communication | 2023 |
| Tkberg AS | Financial services | 2005 |
| TMK Media AS | Information & communication | 2020 |
| To Verdiløse Menn AS | Administrative & support | 2023 |