| Suxess AS | Hospitality | 1996 |
| Svalun AS | Energy | 2020 |
| Svartbekkvegen 3 AS | Real estate | 2018 |
| Sverdrups Gate 44 AS | Real estate | 2019 |
| Switch Bil AS | Wholesale & retail | 2024 |
| Sykkel & Fritid Hamar AS | Wholesale & retail | 2006 |
| Sykkelbirger Kapital AS | | 2026 |
| Syn Pedersen AS | Health & social care | 2012 |
| Sysflow AS | Information & communication | 2023 |
| Søbbak AS | Real estate | 2016 |
| Søberg Holding AS | Financial services | 2010 |
| Sølvbanken AS | Wholesale & retail | 2013 |
| Sømo Holding AS | | 2023 |
| Søre Trysil Vind Da | Energy | 2024 |
| Sørensen Arkitektur AS | Professional & scientific | 2014 |
| Sørli & Co AS | Real estate | 2012 |
| Sørli Infrastruktur AS | Real estate | 2026 |
| Sørlie Takst AS | Real estate | 2017 |
| Søstuen Barber AS | Other services | 2025 |
| T-Mac Invest AS | | 2020 |
| T-Vindfallet Holding AS | Real estate | 2016 |
| Taasos AS | Other services | 2021 |
| Takstplan AS | Professional & scientific | 2016 |
| Talas AS | Real estate | 2007 |
| TANN1 Din AS | Manufacturing | 2025 |
| Tannlege Elin Slaatmo AS | Health & social care | 2019 |
| Tannlege Geir Frøyshov AS | Health & social care | 1987 |
| Tannlege Jon Olav Aabakken AS | Health & social care | 2005 |
| Tannlege Kjersti Høye AS | Health & social care | 2018 |
| Tannlege Margrethe Bronken Hartz AS | Health & social care | 2012 |
| Tannlege Marie Eng AS | Health & social care | 2019 |
| Tannlege Nabeel Mekhlif AS | Health & social care | 2009 |
| Tannlege Petar Ninkov AS | Health & social care | 2014 |
| Tannlege Tore Avlesen AS | Health & social care | 2007 |
| Tannlege Vaadal AS | Health & social care | 1999 |
| Tave Holding AS | | 2023 |
| Taxiforsikring AS | | 2017 |
| TBG Rit AS | | 1991 |
| Team a AS | Construction | 2022 |
| Team Frisører AS | Other services | 1998 |
| Team Snugglemoth AS | Information & communication | 2023 |
| Team Tomorrow AS | Professional & scientific | 2021 |
| Teas Holding AS | Real estate | 2007 |
| Teater Innlandet AS | Arts & recreation | 2010 |
| Teaterkjøkkenet AS | Hospitality | 2017 |
| Technolite Ans | | 1990 |
| Technologies AS | Information & communication | 2022 |
| Technoteam Prosjekt AS | Construction | 2015 |
| Teig Digital AS | Information & communication | 2019 |
| Teknopilot AS | Information & communication | 2011 |
| Tekstur AS | Other services | 2012 |
| Tele Innlandet AS | Real estate | 2009 |
| Telekiosken Innlandet AS | Wholesale & retail | 1989 |
| Teller Tall AS | Professional & scientific | 2023 |
| Tempus Eiendom AS | Administrative & support | 2021 |
| Terminalpartner AS | Real estate | 2003 |
| Terningen Arena Barnehage AS | Education | 2009 |
| Teva Invest AS | | 2021 |
| The Assessment Company Holding AS | Professional & scientific | 2014 |
| The Assessment Company Norge AS | Professional & scientific | 2017 |
| The Film Company AS | Information & communication | 2021 |
| The Final Distance Expedition 2002 Da | Arts & recreation | 2002 |
| The Irishman Drift AS | Hospitality | 2019 |
| The Irishman Eiendom AS | Real estate | 2019 |
| The Irishman Holding AS | Hospitality | 2019 |
| Theodorsen Wining AS | Arts & recreation | 2013 |
| Therese Enger AS | Arts & recreation | 2019 |
| Therese Kaulum AS | Wholesale & retail | 2014 |
| Thomas Antonsen Holding AS | | 2020 |
| Thomas Lund Holding AS | Financial services | 2016 |
| Thor Gundersen AS | Transport & logistics | 2004 |
| Thorshaug Holding AS | | 2005 |
| Throwhill AS | Real estate | 2015 |
| Throwhill Eiendom AS | Real estate | 2020 |
| Tibe Ferskvann AS | Professional & scientific | 2024 |
| Tide Moment AS | Professional & scientific | 2019 |
| Tidløst Treverk AS | Construction | 2022 |
| Tiensu Energy Solutions AS | Wholesale & retail | 2012 |
| Tips Trafikkskole AS | Education | 2025 |
| Tjelde Vassdragsteknikk AS | Professional & scientific | 2023 |
| Tjuvholmen Arena Event AS | Arts & recreation | 2014 |
| Tjuvholmen Hamar Holding AS | | 2020 |
| Tjuvholmen Kro AS | Hospitality | 2005 |
| Tki Eiendom AS | Real estate | 2005 |
| Tki Holding AS | Real estate | 1991 |
| Tki Innlandet AS | Wholesale & retail | 2020 |
| TM Consult AS | Professional & scientific | 2023 |
| TNT Kiropraktikk Og Rehabilitering AS | Health & social care | 2015 |
| Tofastrud Romakustikk AS | Professional & scientific | 2020 |
| Tofo Eiendom AS | Real estate | 2005 |
| Tolibu AS | Real estate | 2020 |
| Tolibu Consult AS | Professional & scientific | 2025 |
| Tollefsen Butikkdrift AS | Wholesale & retail | 2014 |
| Tominutterfor Holding AS | | 2018 |
| Tommelstadveien 23 AS | Real estate | 2021 |
| Tomo Aktiv AS | Manufacturing | 2005 |
| Tomos AS | Real estate | 2012 |
| Tomtegata Prosjekt AS | Real estate | 2022 |
| Tomtepartner Norge AS | Wholesale & retail | 2013 |
| Tools Invest AS | | 2021 |