| Rør Og Vedlikehold AS | Construction | 2020 |
| S.D.S Anlegg AS | Construction | 2025 |
| Safe Accounts AS | Professional & scientific | 2006 |
| Sagdal Holding AS | Construction | 2019 |
| Sagulo AS | Professional & scientific | 2016 |
| Salimi Holding AS | Hospitality | 2024 |
| Salong Sihlouette Da | Other services | 1998 |
| Sami & Co AS | Transport & logistics | 1982 |
| Sandbukta VK SA | Water & waste | 2015 |
| Saneringseksperten AS | Construction | 2022 |
| Santino Restaurant AS | Hospitality | 2024 |
| Schou AS | Wholesale & retail | 1937 |
| Scorpio Eiendom AS | Real estate | 1993 |
| Selje Transport AS | Transport & logistics | 2006 |
| Serm Holding AS | Wholesale & retail | 2007 |
| Shopsy AS | Information & communication | 2024 |
| Siaco AS | Information & communication | 2025 |
| Silver Falcon AS | | 2019 |
| Sirkus Agio AS | Administrative & support | 2019 |
| Sitecontrol AS | Professional & scientific | 2015 |
| Sjur Holding AS | | 2021 |
| Sjuve Holding AS | Agriculture & fishing | 2021 |
| Skilt Og Reklame Kløfta AS | Professional & scientific | 2007 |
| Skiltdirect AS | Manufacturing | 2012 |
| Skodvin AS | Real estate | 1995 |
| Skog & Virke AS | Agriculture & fishing | 2017 |
| Skog & Virke Entreprenør AS | Agriculture & fishing | 2019 |
| Sky Consult AS | Information & communication | 2022 |
| Skytterlinken AS | Wholesale & retail | 2005 |
| Slettebø Elektriske AS | Construction | 1987 |
| SLH Invest AS | Wholesale & retail | 2011 |
| Smia Service AS | Wholesale & retail | 2024 |
| Snekker Eksperten AS | Construction | 2024 |
| Snekkerverket AS | Construction | 2023 |
| Snodi AS | Wholesale & retail | 2018 |
| Sofaland & Bilsalg AS | Wholesale & retail | 2016 |
| Solem Trading AS | | 2005 |
| Sos Biloppretting AS | Other services | 1989 |
| SP Investeringer AS | Real estate | 2025 |
| SP Sprinkler AS | Construction | 2024 |
| SP Sprinkler Holding AS | Construction | 2024 |
| Spectr AS | Wholesale & retail | 2026 |
| Spider Network AS | Administrative & support | 2021 |
| Sport Og Fritid Birkelund AS | Wholesale & retail | 1989 |
| Sportica AS | Arts & recreation | 2007 |
| Sportsholding AS | Wholesale & retail | 2020 |
| SRK Byggentreprenør AS | Construction | 2021 |
| SRM Eiendom AS | Real estate | 2020 |
| SRM Invest AS | Construction | 2020 |
| Stangeskovene Kværner AS | Wholesale & retail | 1997 |
| Star Restaurant Pizza Og Bar AS | Hospitality | 2022 |
| Statbygg AS | Construction | 2024 |
| Stein & Flis Da | Construction | 2006 |
| Stein Og Utemiljø AS | Wholesale & retail | 2023 |
| Steth AS | Wholesale & retail | 2010 |
| Stian Østby Transport AS | Transport & logistics | 2012 |
| Stokkervegen 2 AS | Real estate | 2019 |
| Strømmen Bygg AS | Construction | 2014 |
| Støre Classic Cars AS | Wholesale & retail | 2020 |
| Støre Eiendom AS | Wholesale & retail | 2006 |
| Supersonic Holding AS | | 2022 |
| Surya Services AS | Wholesale & retail | 2020 |
| Sverre Knutsen AS | Real estate | 2009 |
| Svindal Bil AS | Wholesale & retail | 2015 |
| Sørby Kroktransport AS | Transport & logistics | 2015 |
| Sørlandets Hytteutleie AS | Real estate | 2014 |
| Sørum Transport AS | Transport & logistics | 1986 |
| Taenparaply AS | Administrative & support | 2025 |
| Tekoda Elektro AS | Construction | 2012 |
| Tenki Labs AS | Information & communication | 2026 |
| Terratech AS | Wholesale & retail | 2015 |
| The Big Egg Group AS | Information & communication | 2020 |
| The Exception AS | Professional & scientific | 2012 |
| Thorstein Og Dag Konsulent AS | Construction | 1996 |
| THP Invest AS | | 2006 |
| Three Wishes Productions AS | Information & communication | 2019 |
| Tibro AS | Real estate | 2013 |
| Tifn Holding AS | Real estate | 2021 |
| Tindevindu AS | Wholesale & retail | 2013 |
| TK Bussreiser AS | Transport & logistics | 2008 |
| TLP Eiendom AS | Real estate | 2018 |
| Tolkmedinvest AS | Professional & scientific | 2025 |
| Topp Rør AS | Construction | 2023 |
| Toppin AS | Information & communication | 2014 |
| Tor O. Wethal Holding AS | Wholesale & retail | 2023 |
| Tore Jødahl AS | Construction | 1987 |
| TP Rent AS | Administrative & support | 2022 |
| TPH Consulting AS | | 2025 |
| TQH AS | | 2023 |
| Treider Handel AS | Other services | 2023 |
| Trend Gadget Da | Wholesale & retail | 2007 |
| Trenob Holding AS | Information & communication | 2017 |
| Tron & Bente Eiendom AS | Real estate | 2005 |
| Trondheimsvegen Kløfta 96 AS | | 2023 |
| Trymbla Holding AS | Information & communication | 2014 |
| Tunmo Invest AS | Real estate | 2016 |
| Turbo Parts AS | Wholesale & retail | 2024 |
| Turbo Power Norway AS | Wholesale & retail | 2017 |
| Turfcleaner AS | Professional & scientific | 2019 |
| Tydal Invest AS | Information & communication | 2024 |