| Son Skafferi AS | Hospitality | 2025 |
| Son Spa AS | Hospitality | 2007 |
| Son Sushi AS | Hospitality | 2016 |
| Son Tennis Akademi AS | Wholesale & retail | 1981 |
| Son Verft AS | Real estate | 2020 |
| Son VVS AS | Construction | 2013 |
| Sonnich Holding AS | | 2021 |
| Sonresult AS | | 2024 |
| Sonshus AS | Real estate | 2013 |
| Sonskilen Båthavn AS | Real estate | 2020 |
| Soon Blomster AS | Wholesale & retail | 2003 |
| Soon Computer Team Da | Information & communication | 1999 |
| Soon Custom Da | Other services | 2012 |
| Soon Golfbane AS | Arts & recreation | 2006 |
| Soon Ledelse Og Teamutvikling Ans | Administrative & support | 1999 |
| Soon Marine AS | | 2025 |
| Soon Skibshandleri AS | Wholesale & retail | 2015 |
| Soon Snekkerverksted AS | Manufacturing | 1990 |
| Soon Trading AS | Professional & scientific | 2020 |
| Soon Vision SA | Information & communication | 2001 |
| SOON59 AS | Professional & scientific | 2021 |
| Sorosnes AS | Financial services | 2015 |
| Spesialisthelse AS | Health & social care | 2017 |
| Spiritus Ambrosiae AS | Wholesale & retail | 2025 |
| Sport Og Grøntanlegg AS | Administrative & support | 2002 |
| Sprinklerconsult AS | Professional & scientific | 2017 |
| ST Maskin AS | Wholesale & retail | 2019 |
| Standard Dieselservice AS | Wholesale & retail | 2015 |
| Steens Corporate Consult AS | Professional & scientific | 2012 |
| Steiro Medical AS | Health & social care | 2021 |
| Stenbakken AS | Agriculture & fishing | 1998 |
| Stensli Vann- Og Avløpslag SA | Water & waste | 2019 |
| Sterner Invest AS | | 2005 |
| Stokkeland Int Consulting AS | Professional & scientific | 1997 |
| Stolten Consulting AS | Health & social care | 2016 |
| Stoltenberg Gården Restaurant Drift AS | Hospitality | 2018 |
| Store Brevik Barnehage AS | Education | 2022 |
| Storgata Son AS | Real estate | 2017 |
| Strandstua Invest AS | | 2024 |
| Strong Eiendom AS | Real estate | 2019 |
| Sustainnord AS | Professional & scientific | 2025 |
| Sustech Da | Information & communication | 2023 |
| Sval Invest AS | | 2007 |
| Svesund AS | Financial services | 2006 |
| Synopus AS | Professional & scientific | 2000 |
| Søndre Brevik Gård AS | Agriculture & fishing | 1972 |
| T.G Invest AS | Health & social care | 2022 |
| Takstfirma Karlstad AS | Real estate | 2000 |
| Tannlege Sand AS | Health & social care | 2013 |
| Teatro AS | Arts & recreation | 2010 |
| Techpros Holding AS | Information & communication | 2021 |
| Tecnia AS | Construction | 2017 |
| Teho AS | Health & social care | 2018 |
| Tekmas AS | Professional & scientific | 2005 |
| Tembo Safari | Administrative & support | 2011 |
| Temi Holding AS | Arts & recreation | 2014 |
| Tempting AS | Real estate | 2021 |
| TH Solutions AS | Transport & logistics | 2021 |
| Themar Invest AS | Professional & scientific | 2010 |
| Thome Holding AS | | 2005 |
| Thornegaarden Kulturdrift AS | Hospitality | 2025 |
| Thornegården Antikvariat AS | Wholesale & retail | 2016 |
| Thornegården Frisør AS | Other services | 2003 |
| Thorvaldsen Ans | Education | 2008 |
| Tikktakk AS | Professional & scientific | 2002 |
| Timberhill Holding AS | | 2024 |
| TK Robotics AS | Wholesale & retail | 2024 |
| TLW AS | Real estate | 2015 |
| TNG Invest AS | | 2022 |
| To Grønne Menn Da | Wholesale & retail | 2008 |
| Tob-Grossist AB | Wholesale & retail | 1995 |
| Tom-Remi Hansen Stenqvist AS | Wholesale & retail | 2017 |
| Topbrandsoutlet Da | Wholesale & retail | 2004 |
| Tore Stai Holding AS | Real estate | 2015 |
| Torvgården Cafe & Design AS | Wholesale & retail | 2016 |
| Torvgården Eiendom AS | Real estate | 2016 |
| Tot AS | Professional & scientific | 2020 |
| Totalmiljø AS | Professional & scientific | 2000 |
| Traco Norway AS | Wholesale & retail | 2024 |
| Tregulvspesialisten AS | Construction | 2015 |
| Trejo Eiendom AS | Real estate | 2019 |
| Trettiknop Holding AS | | 2025 |
| Trine Åldstedt - Mastery Work AS | | 2009 |
| Trinn 2 AS | Professional & scientific | 2002 |
| True Colors Maling AS | Construction | 2022 |
| Trye AS | Administrative & support | 2019 |
| Tt-Drift AS | Real estate | 2021 |
| Tør AS | Professional & scientific | 2019 |
| Unstoppabl.Ai AS | Information & communication | 2023 |
| V17 Eiendom AS | Real estate | 2016 |
| Vandelay AS | | 2014 |
| Varbø Parkering AS | Transport & logistics | 2005 |
| Vardtech AS | | 2021 |
| Varme Og Sikkerhet AS | Wholesale & retail | 2024 |
| Varmefokus AS | Construction | 2012 |
| VB Helse AS | Health & social care | 2016 |
| Vecom Elektronikk Da | Construction | 1990 |
| Vefo AS | Real estate | 2019 |
| Vegard Holum AS | Wholesale & retail | 2021 |
| Veggja AS | Professional & scientific | 2018 |