| Storaas-Barsnes AS | Professional & scientific | 2015 |
| Stordalen Entreprenør AS | Construction | 2010 |
| Stordalen Maskin AS | Construction | 2024 |
| Stordalen Prosjektutvikling AS | Real estate | 2012 |
| Stordalen Vann Og Avløp AS | Water & waste | 2016 |
| Storgata 7 Kongsberg AS | Real estate | 2015 |
| Storgata Alltid AS | Wholesale & retail | 2025 |
| Storliveien SA | Real estate | 1992 |
| Storm Trefelling AS | Agriculture & fishing | 2018 |
| Stornesvegen Eiendom AS | Real estate | 2021 |
| Storseter Eiendom AS | Real estate | 2012 |
| Storseter Holding AS | Construction | 2012 |
| Strand Trafikkskole AS | Education | 2019 |
| Strapats AS | Information & communication | 2024 |
| Studio 3 Dans AS | Education | 2014 |
| Står Støtt AS | Manufacturing | 2022 |
| Stærnesgården AS | Real estate | 1986 |
| Subcon Kongsberg AS | Wholesale & retail | 1996 |
| Subsea Robotics | Information & communication | 2011 |
| Sundown Invest AS | Mining & quarrying | 2018 |
| Supreme Auto AS | Wholesale & retail | 2022 |
| Supreme Auto Norway AS | Wholesale & retail | 2026 |
| Surtelia Invest AS | Construction | 2005 |
| Sussi Holding AS | Real estate | 2009 |
| Suveren Fasade AS | Administrative & support | 2013 |
| SV Maskin AS | Construction | 2014 |
| Svein Aannestad Rådgivning Og Prosjektledelse AS | Professional & scientific | 2019 |
| Svein Løken Eftf AS | Construction | 2019 |
| Svein Ødegård AS | Financial services | 2005 |
| Svend Haugs Gate 1 AS | Real estate | 2018 |
| Svensk Eiendom AS | Real estate | 2011 |
| Swflc AS | Manufacturing | 2022 |
| Syklisten AS | Wholesale & retail | 2013 |
| Syspire AS | Wholesale & retail | 2024 |
| Systor AS | Information & communication | 1987 |
| Sytti-Tretti AS | Professional & scientific | 2021 |
| Syntax AS | Information & communication | 1988 |
| Så Engineering AS | Professional & scientific | 2026 |
| Sølvberget Sikkerhet AS | Administrative & support | 2005 |
| Sølvbyen Legesenter AS | Health & social care | 2018 |
| Sølvgruven Eiendom Ans | Real estate | 1997 |
| Sølvknuten Bolig AS | Real estate | 2017 |
| Sølvknuten Energisentral AS | Energy | 2017 |
| Sølvknuten Holding AS | Other services | 2017 |
| Sølvsaksa AS | Other services | 2017 |
| Sølvstuffen AS | Education | 2007 |
| Sølvtoppen AS | Real estate | 2019 |
| Søndre Kullerød 4B AS | Real estate | 2003 |
| Sør-Norge Eiendom AS | Real estate | 2008 |
| Sør-Svene Tomteutvikling AS | Real estate | 2016 |
| Sørdal Mat AS | | 2022 |
| Sørskogen Vest Hyttelag SA | Water & waste | 2020 |
| Søstrene Storaas Holding AS | Hospitality | 2020 |
| Søstrene Storaas Hotell AS | Hospitality | 2019 |
| T Ihler Nuf | Administrative & support | 2009 |
| T Smeland Holding AS | | 2024 |
| Tandoori Masala AS | Hospitality | 2019 |
| Tannlege Bent Dramdal AS | Health & social care | 2013 |
| Tannlegene Bommen AS | Health & social care | 2010 |
| Tante Grønn AS | Hospitality | 1999 |
| TB Capital AS | Professional & scientific | 2025 |
| TBC Holding AS | Education | 2022 |
| TDJ AS | | 2025 |
| Team Worldtech AS | Professional & scientific | 2017 |
| Teb Eiendom AS | Education | 2001 |
| Technipfmc Norge AS | Manufacturing | 2003 |
| Technovation AS | Manufacturing | 2005 |
| Techofnorth AS | Information & communication | 2026 |
| Tegnsatt AS | Professional & scientific | 2023 |
| Tekkon AS | Professional & scientific | 2013 |
| Tekonik AS | Professional & scientific | 2022 |
| Telegrafen Legekontor Da | Health & social care | 2011 |
| Telemark Eiendomsinvest AS | Real estate | 2006 |
| Telemaster AS | Construction | 2013 |
| Teletolk AS | Professional & scientific | 2012 |
| Tellmie AS | Information & communication | 1996 |
| Teltec Regnskap AS | Professional & scientific | 1994 |
| Ten-Holding AS | | 2024 |
| Teqnica AS | Information & communication | 2016 |
| Terapeut Pernille Villadsen AS | Health & social care | 2022 |
| Terje Sollid AS | Construction | 2006 |
| Terrafirma AS | Wholesale & retail | 2000 |
| Teso Invest AS | Professional & scientific | 2005 |
| Tet Eiendom AS | Real estate | 2016 |
| TH Motor AS | Other services | 2016 |
| Th-Konsulenttjenester AS | Administrative & support | 2021 |
| The Luggage AS | | 2025 |
| The Rock'N'Roll Express AS | Arts & recreation | 2025 |
| The Shed AS | Real estate | 2023 |
| The Wagonshed Project AS | Professional & scientific | 2021 |
| Thomassen Invest AS | | 2026 |
| Thornesvei 4 AS | Real estate | 2005 |
| Throndsen AS | Financial services | 1998 |
| Tidemands Gate 4A AS | Real estate | 2017 |
| Tidya AS | Information & communication | 2021 |
| Tigergutt AS | | 2005 |
| Tiller Tre AS | Construction | 2018 |
| Timil Media AS | Wholesale & retail | 2025 |
| Tinmark Tailor&Design AS | Professional & scientific | 2026 |
| Tislegård Eiendom AS | Manufacturing | 1977 |