| Sandland Treteknologi AS | Professional & scientific | 2015 |
| Sandviksveien 233 Ans | | 1993 |
| Sans Egal AS | Real estate | 2012 |
| Schia Prestisje AS | Wholesale & retail | 2023 |
| Secava AS | | 2019 |
| Seevi AS | | 2002 |
| Seht Holding AS | | 2023 |
| Sekkelsten AS | | 2024 |
| Serendi AS | Professional & scientific | 1998 |
| Serine Invest AS | Professional & scientific | 2019 |
| Sface Softsolutions AS | Information & communication | 2021 |
| Sindingskogen Ans | Agriculture & fishing | 2002 |
| Sjaand Invest AS | Financial services | 2017 |
| Sjøvollen AS | Real estate | 2005 |
| Skimre AS | | 2021 |
| Skisakeråsen Øvre Vann Og Avløp AS | Water & waste | 2022 |
| Skogen Finstad Da | Agriculture & fishing | 2005 |
| Skorge Eiendom AS | Wholesale & retail | 2013 |
| Skorge Invest AS | Professional & scientific | 2012 |
| Slependen Legesenter AS | Health & social care | 2006 |
| Sokrates Invest AS | Real estate | 2012 |
| Son 087 Holding AS | | 2023 |
| Stabil Montasje AS | Construction | 2026 |
| Stil Eiendomsutvikling AS | Real estate | 2020 |
| Stor Oslo Kran & Montasje AS | Administrative & support | 2022 |
| Storelvmo Consultancy AS | Professional & scientific | 2017 |
| Strigiformes AS | | 2026 |
| Stubberud Holding AS | | 2014 |
| Studio 5 Grafisk AS | Manufacturing | 2003 |
| Sundblad Holding AS | Professional & scientific | 2020 |
| Sunnøkonomi AS | Professional & scientific | 2012 |
| Supreme Holding AS | Wholesale & retail | 2019 |
| Svevo AS | Real estate | 2016 |
| Søkke Og Snøre Invest AS | | 2020 |
| Søster Swim AS | Wholesale & retail | 2022 |
| T. Hagen Invest AS | | 2023 |
| Tangstad Holding AS | Real estate | 2015 |
| Tanum Fus Barnehage AS | Education | 1998 |
| Tanum Gård AS | | 2021 |
| Tanum Legekontor Da | Health & social care | 2001 |
| Tanum Rideskole AS | Education | 2007 |
| Tanum Rørservice AS | Construction | 2009 |
| Tanum Studio AS | Information & communication | 2014 |
| TBR 443 Holding AS | | 2023 |
| Techgen AS | Professional & scientific | 2020 |
| Tee Time AS | Education | 2024 |
| Tekst Og Kode AS | Information & communication | 2018 |
| Termo Swim Da | Education | 2004 |
| Theoline AS | Real estate | 2008 |
| Thinkahead AS | Education | 2013 |
| Tilla AS | Financial services | 2005 |
| Tinoa AS | Financial services | 2015 |
| Tjora Forlag AS | Information & communication | 2024 |
| TJP Eiendom AS | Real estate | 2025 |
| TJP Invest AS | | 2025 |
| To-Mo AS | Wholesale & retail | 2020 |
| Toja Kontorservice Da | Other services | 1992 |
| Toothfairy Farm AS | Arts & recreation | 2018 |
| Totolo Invest AS | Financial services | 2017 |
| Trad Invest AS | | 2021 |
| Trulserudveien Utvikling AS | Real estate | 2025 |
| Trygg Eiendoms Forvaltning AS | Administrative & support | 2026 |
| Turoteknikk Drift AS | Wholesale & retail | 2012 |
| Tømrermester Cato Sørensen AS | Construction | 2011 |
| Urbanus AS | Real estate | 2013 |
| Vaageby AS | Professional & scientific | 2007 |
| Vanbergs Eftf. Eiendom AS | Real estate | 2011 |
| Varnel AS | Wholesale & retail | 2024 |
| Vedema AS | Financial services | 2008 |
| Velociter AS | Professional & scientific | 2002 |
| Veloria AS | Hospitality | 2024 |
| Verdens Nordligste AS | Administrative & support | 2013 |
| Vestlie AS | Real estate | 2007 |
| Vianuten AS | | 2024 |
| Vindfjell AS | Real estate | 1994 |
| Vindoy Consulting AS | Information & communication | 2022 |
| Virtuell Visning AS | Professional & scientific | 2020 |
| Visu Asset Management AS | Wholesale & retail | 2019 |
| Vov AS | Construction | 2023 |
| VT Dekk Og Bilglass AS | Other services | 1993 |
| Waal Snertingdalen AS | Financial services | 2014 |
| Wahl Street AS | Financial services | 2010 |
| We Fix Drift AS | Administrative & support | 2014 |
| Wearit AS | Information & communication | 2019 |
| Ylva Ventures AS | | 2026 |
| Yolo Consult AS | Professional & scientific | 2012 |
| Yri Holding AS | Agriculture & fishing | 2021 |
| Ytrebø Vann- Og Avløpslag SA | Water & waste | 2020 |
| Æsir AS | | 2022 |
| Émod Holding AS | Professional & scientific | 2023 |
| Økonomisk Helse AS | Information & communication | 2026 |
| Økonomitalent AS | Professional & scientific | 2025 |
| Økoplan AS | Professional & scientific | 1998 |
| Ørvik AS | Financial services | 2013 |
| Østlandet Pharma Invest AS | Real estate | 2009 |
| Østlandske Vaktmestertjenester AS | Administrative & support | 2016 |
| Øyvind Reneflot AS | Real estate | 1985 |