| Topics AS | Information & communication | 2022 |
| Torax AS | Information & communication | 1990 |
| Tordenvær AS | Information & communication | 2016 |
| Tordivelen Holding AS | Financial services | 2015 |
| Torger Helleberg AS | Health & social care | 2002 |
| Torggata 121 AS | Real estate | 1998 |
| Torggata 13 Hamar AS | Real estate | 2025 |
| Torggata 3 Hamar AS | Real estate | 2025 |
| Torggata 36 AS | Real estate | 2003 |
| Torggata 41 Holding AS | Real estate | 2024 |
| Torggata 41 Næring AS | Real estate | 2024 |
| Torggata 54 AS | Real estate | 1989 |
| Torggata 82 AS | Real estate | 2021 |
| Torggata 83 Drift AS | Hospitality | 2025 |
| Torggt 1 AS | Real estate | 2000 |
| Torggt 22 AS | Real estate | 2000 |
| Torghjørnet AS | Real estate | 1997 |
| Torghjørnet Restaurantdrift AS | Hospitality | 2021 |
| Torleiv Sverdrup AS | Financial services | 2005 |
| Torolf Storsveens Veg 27 AS | Real estate | 2023 |
| Torshov Park AS | Real estate | 2007 |
| Toyota Sulland Hamar AS | Wholesale & retail | 1991 |
| TPW Holding AS | | 2020 |
| Tradom AS | Other services | 2012 |
| Trainee Innlandet SA | Administrative & support | 2011 |
| Trangsrud Medical AS | Health & social care | 2020 |
| Transfer Galaxy Technology AS | Professional & scientific | 2020 |
| TRC Nordic AS | Administrative & support | 2025 |
| Treebook AS | Information & communication | 2022 |
| Trehusene På Navneberget AS | Real estate | 2021 |
| Trehørningen AS | Real estate | 2021 |
| Trend Optikk AS | Wholesale & retail | 2000 |
| Trendmat AS | Professional & scientific | 2014 |
| Trengeru AS | Construction | 2022 |
| Trete Forvaltning AS | Real estate | 2017 |
| Tretoen AS | Information & communication | 2019 |
| Triangelgården Invest AS | Real estate | 2007 |
| Trion Ans | Real estate | 2008 |
| Troller Eiendom AS | Real estate | 1996 |
| Troller Holding AS | | 2025 |
| Trommerommet AS | Arts & recreation | 2014 |
| Tru Holding AS | Real estate | 2007 |
| Trygg Netthandel AS | Wholesale & retail | 2024 |
| Tryggere Hjem AS | Health & social care | 2007 |
| Trym Invest AS | | 2015 |
| Trym S AS | Arts & recreation | 2024 |
| Trysil Konsult AS | Administrative & support | 2016 |
| Trysil Turistsenter Eiendom AS | Real estate | 2016 |
| Trønnes Holding AS | | 2024 |
| TS Aktiv AS | Financial services | 2015 |
| Ts-Øst Holding AS | Transport & logistics | 2007 |
| TSK 115 Holding AS | Financial services | 2023 |
| Tunn AS | | 1991 |
| Tvirø Holding AS | Hospitality | 2021 |
| Torvgaten 32 AS | Real estate | 1982 |
| Tønseth Utvikling AS | Real estate | 2012 |
| Ua Eiendom AS | Real estate | 2019 |
| Ua Holding AS | Other services | 2019 |
| Ubatuba AS | | 2019 |
| Unimed Eiendom AS | Real estate | 2020 |
| Unique R&M Da | Wholesale & retail | 2004 |
| Unity Nuf | Education | 2021 |
| Universal Rengjøring AS | Administrative & support | 2021 |
| Upday AS | Professional & scientific | 2014 |
| Upl Hamar AS | Real estate | 2019 |
| Upl Hamar Reorg AS | Real estate | 2021 |
| Ur & Sånn AS | Wholesale & retail | 2013 |
| Ursa AS | Manufacturing | 2019 |
| Ursapunk Games AS | Information & communication | 2026 |
| Utfarten Hamar AS | Real estate | 2011 |
| Uthus Bruk AS | Real estate | 1986 |
| Uthuskrysset Eiendom 1 AS | Real estate | 2012 |
| Utstillingsplassen Eiendom AS | Real estate | 1986 |
| V-Invest AS | Real estate | 2012 |
| VAKTMESTER1 AS | Administrative & support | 2011 |
| Vals Invest AS | Real estate | 2014 |
| Vang Brænderi AS | Real estate | 2005 |
| Vangsvegen 119 AS | Real estate | 2019 |
| Vangsvegen 121 AS | Real estate | 2022 |
| Vangsvegen 71 AS | Real estate | 2005 |
| Vangsvegen 73 AS | Real estate | 2019 |
| Vangsvegen 75 AS | Real estate | 2005 |
| Vangsvegen 91 AS | Real estate | 2019 |
| Vangsveien 100 AS | Real estate | 1989 |
| Vangsveien 63 AS | Real estate | 1996 |
| Vannmelon Holding AS | Professional & scientific | 2022 |
| Varate Eiendom AS | | 2021 |
| Vega Subsea AS | Professional & scientific | 2008 |
| Vegard Kokslien AS | Real estate | 2015 |
| Vekstra Eier AS | Professional & scientific | 2003 |
| Vella Holding AS | | 2021 |
| Vensli AS | Real estate | 2019 |
| Ventura Utvikling AS | Professional & scientific | 2024 |
| Verdi Vekst AS | Construction | 2023 |
| Verdiinvest AS | Real estate | 1999 |
| Versantur Eiendom AS | Real estate | 2019 |
| Vertebrae Entertainment AS | Information & communication | 2020 |
| Vestvannet Invest AS | Real estate | 1998 |
| Veterinær Maria Synnes AS | Professional & scientific | 2016 |
| Vextra AS | Professional & scientific | 1988 |