| Stories of Tomorrow AS | Information & communication | 2023 |
| Stormer Marine AS | Manufacturing | 2010 |
| Storviken AS | Professional & scientific | 2005 |
| Strange-Hansen Invest AS | | 2020 |
| Streamfabrikken AS | Information & communication | 2021 |
| Struts Consult AS | Administrative & support | 2024 |
| Styrk Helse AS | Health & social care | 2022 |
| Ståle Ludvigsen AS | Construction | 1997 |
| Subseadesign AS | Professional & scientific | 2020 |
| Sumaya Khalil AS | Wholesale & retail | 2023 |
| Suri Holding AS | Health & social care | 2023 |
| Svein Helgeland AS | Health & social care | 1992 |
| Sveinsson Invest | | 2022 |
| Svenningsen Invest AS | | 2005 |
| Svensefjøset AS | Manufacturing | 2013 |
| Swapo Industri AS | Wholesale & retail | 2024 |
| Sylling Jordvanning SA | Agriculture & fishing | 1979 |
| Søhus Transport AS | Transport & logistics | 1996 |
| SØR.1 Holding AS | Real estate | 2005 |
| Søren Helmen Haskoll Gartneri Da | Agriculture & fishing | 2006 |
| Sørnes Invest AS | Real estate | 2007 |
| T Fjeld Biltransport AS | Transport & logistics | 2001 |
| Tabas Holding AS | Administrative & support | 2005 |
| Tak Og Byggpartner AS | Construction | 2024 |
| Tannlege Stine Merethe Moen AS | Health & social care | 2022 |
| Tannlege Truls Moen AS | Health & social care | 2000 |
| Tataki.Ai AS | Information & communication | 2025 |
| TB Venture AS | | 2020 |
| Te Landskap AS | Administrative & support | 2021 |
| Team 4 Invest AS | Construction | 2018 |
| Team Takmestere AS | Construction | 2023 |
| Tech Eiendom AS | Real estate | 2022 |
| Tech Pro AS | Other services | 2024 |
| Technity Engineering AS | Professional & scientific | 2026 |
| Tenax AS | Manufacturing | 2005 |
| Tenera Eiendom AS | Real estate | 2023 |
| Tenold Capital Group AS | Real estate | 2019 |
| Tepf AS | | 2018 |
| Thes Invest AS | Real estate | 2021 |
| Thielemann AS | Financial services | 2018 |
| Thok Invest AS | | 2020 |
| Thormod Saue Transport AS | Transport & logistics | 1995 |
| Tiberion AS | | 2024 |
| Tidemann Eiendom AS | Real estate | 2025 |
| Tidemann-Andersen Holding AS | Health & social care | 2021 |
| Tidvind Holding AS | | 2023 |
| Tjonsbakken Eiendom AS | Real estate | 2014 |
| TK Capital AS | Real estate | 2022 |
| TK Karting Ans | Wholesale & retail | 1994 |
| TLS Elektro AS | Construction | 2018 |
| Tollbugata Drammen 8 AS | Real estate | 1993 |
| Tomali AS | Health & social care | 2011 |
| Tonum Invest AS | Financial services | 2015 |
| Top Log Cargo Group AS | Transport & logistics | 2000 |
| Tore Lund Bygg AS | Construction | 1994 |
| Total Brannalarmservice AS | Construction | 2019 |
| Totalrent AS | Administrative & support | 2025 |
| Tove Mortensen AS | Professional & scientific | 2017 |
| Trafikklærer Hakan AS | Education | 2023 |
| Tranby-Utenga AS | Agriculture & fishing | 2018 |
| Traveloffice AS | Administrative & support | 2014 |
| Travexperten.No AS | Administrative & support | 2020 |
| Treffen Maskin AS | Construction | 2023 |
| Tressinvest AS | Transport & logistics | 2020 |
| Trino Invest AS | | 2018 |
| TRP Software AS | Information & communication | 2012 |
| TRS2 AS | Real estate | 2015 |
| Truls Moholdt AS | Financial services | 2013 |
| Trygt Og Ivaretatt AS | Transport & logistics | 2021 |
| Tuftegruppen AS | | 2016 |
| Tveit Eiendomsutvikling AS | Real estate | 2017 |
| Tveten Jordvanning SA | Agriculture & fishing | 1977 |
| Tvetmarken Holding AS | | 2022 |
| Tøfte Kompressorservice AS | Wholesale & retail | 1995 |
| Tømrermester Sagbråten AS | Construction | 2014 |
| Uro L&G AS | Health & social care | 2022 |
| Utenga AS | Agriculture & fishing | 2012 |
| Utenga Bryggeri Holding AS | | 2026 |
| Vako Prosjekt AS | Professional & scientific | 2012 |
| Vawe AS | Information & communication | 2026 |
| Vekta AS | Construction | 2004 |
| Veslefjell Holding AS | | 2016 |
| Veslefrikk Fus Barnehage AS | Education | 2018 |
| Veslevoksen Holding AS | Financial services | 2024 |
| Vestbråtan Villamaskin AS | Other services | 2024 |
| Vestre Lier Grunneierlag SA | Agriculture & fishing | 1995 |
| Vestre Linnes Holding AS | Real estate | 2017 |
| Vestsideveien 3A Eiendom AS | Real estate | 2005 |
| Vestviken Serveringsautomater AS | Wholesale & retail | 2018 |
| Vi Gjør Det Ivesdal Flem Ans | Administrative & support | 2002 |
| Vicoda AS | Wholesale & retail | 2023 |
| Vigen Consulting AS | Professional & scientific | 2026 |
| Vigen Holding AS | Real estate | 2015 |
| Viken Blikkenslager AS | Construction | 2026 |
| Viken Hus Og Eiendom AS | Real estate | 2022 |
| Villa Skaar Lier AS | Health & social care | 2008 |
| Vilmo Invest AS | Real estate | 2005 |
| Vingco AS | Real estate | 1996 |
| Viva La Vida AS | Education | 2005 |
| Vivel Invest AS | Information & communication | 2012 |