| Trelauget AS | Agriculture & fishing | 2025 |
| Tremest Bergen AS | Real estate | 2020 |
| Tremlin Holding AS | | 2025 |
| Tren Byfjordparken AS | Arts & recreation | 2017 |
| Tretec Byggsystemer AS | Manufacturing | 2022 |
| Treverket AS | Construction | 2018 |
| Trifolium AS | Professional & scientific | 2000 |
| Trigram AS | Information & communication | 2015 |
| Trine-Lise Giske Interiør AS | Professional & scientific | 2020 |
| Trinitas AS | Real estate | 2023 |
| Trio Eiendom & Invest Ans | Financial services | 1999 |
| Trio Food Processing Machinery AS | Manufacturing | 1997 |
| Triple M Ans | Hospitality | 2022 |
| Triplex Capital AS | | 2023 |
| Tripod House AS | Real estate | 2018 |
| Trippo Holding AS | | 2022 |
| Trivera AS | Professional & scientific | 2025 |
| Trivium Paradis AS | Real estate | 2025 |
| Troll Næring AS | Real estate | 2012 |
| Trollaskeinuten AS | | 2021 |
| Trollcom AS | Professional & scientific | 2011 |
| Trollfar Eiendom AS | Real estate | 2021 |
| Trollfar Ventures AS | Professional & scientific | 2018 |
| Trollshaugane Panorama AS | Real estate | 2002 |
| Trollspring AS | Real estate | 2015 |
| Trollspring Pure AS | Wholesale & retail | 2026 |
| Trollveien 1 AS | Real estate | 2021 |
| Tromar Eiendom AS | Real estate | 2025 |
| Tromar Invest AS | Real estate | 2025 |
| Trond a Invest AS | | 2021 |
| Trond Halvorsen Invest AS | Construction | 2005 |
| Trond Harald Håland AS | Education | 2026 |
| Trond Haugsgjerd Invest AS | Education | 2005 |
| Trondheimsveien 51A AS | Real estate | 2026 |
| Troneshøyden AS | Real estate | 2022 |
| Tronholberget 1 AS | Real estate | 2023 |
| Tronsholen Utvikling AS | Construction | 2012 |
| Tross AS | Real estate | 2015 |
| Trowi AS | Real estate | 2005 |
| Trucksenter AS | Wholesale & retail | 2016 |
| Truevision AS | Manufacturing | 2023 |
| Trulap Norway AS | Wholesale & retail | 2025 |
| Truman AS | | 2019 |
| Trunkfish Capital AS | | 2007 |
| Truper Thorsen AS | Professional & scientific | 2025 |
| Tryaskola AS | | 2024 |
| Trygg Base AS | Health & social care | 2012 |
| Trygg Eivind Skjelde AS | Wholesale & retail | 2012 |
| Tryggleik Invest AS | | 2022 |
| Trykkerigården AS | Real estate | 1995 |
| TS Rør AS | Construction | 2012 |
| TS Storkjøkken AS | Wholesale & retail | 1994 |
| Tssp AS | Professional & scientific | 2011 |
| TST Bilvask AS | Other services | 2020 |
| Tsunami Ans | Wholesale & retail | 2004 |
| TSV Rådgivning Holding AS | Professional & scientific | 2024 |
| TT Bolig AS | Real estate | 2025 |
| TT Eiendomsdrift AS | Administrative & support | 2022 |
| TT Holding & Invest AS | Real estate | 2005 |
| TT Ingrid Klæboe Lohne AS | | 2019 |
| TT Prosjektadministrasjon AS | Professional & scientific | 2018 |
| TTC AS | Professional & scientific | 2018 |
| Tte Holding AS | Energy | 2021 |
| TTH AS | | 2024 |
| Ttin AS | Professional & scientific | 2014 |
| Tubing Supply AS | Wholesale & retail | 2026 |
| Tucan Invest AS | | 2022 |
| Tuft Vareberg AS | | 2018 |
| Tune Rekvisita AS | Wholesale & retail | 1984 |
| Tunge Eiendom AS | Real estate | 2014 |
| Tunge Holding AS | Health & social care | 2011 |
| Tunge Tannregulering AS | Health & social care | 2017 |
| Turbo Consulting AS | Professional & scientific | 2013 |
| Turfpal AS | Information & communication | 2024 |
| Turinor Invest AS | Professional & scientific | 2007 |
| Turmod AS | | 2020 |
| Turner & Townsend AS | Professional & scientific | 1978 |
| Turnover App AS | Information & communication | 2024 |
| Tusen AS | | 2026 |
| TV Vest AS | Information & communication | 2014 |
| TV Vest Hordaland AS | Information & communication | 2017 |
| Tva Invest AS | | 2025 |
| Tvedt & Co AS | Real estate | 2021 |
| Tvedt Eiendom AS | Real estate | 2017 |
| Tvedt Finans AS | Real estate | 2022 |
| Tvedt Investering AS | Real estate | 2016 |
| Tvedt Maskinveien 8 AS | Real estate | 2004 |
| Tvedt Nybø Holding AS | | 2025 |
| Tvedt Senteret AS | Real estate | 1999 |
| Tveit Bygg AS | Construction | 2024 |
| Tveranger Invest AS | | 2020 |
| Tverrå AS | Wholesale & retail | 2005 |
| Tverrå Eiendom AS | Wholesale & retail | 2015 |
| Tveteraas Capital AS | Financial services | 2010 |
| Tveteraas Capital II AS | | 2018 |
| Tveteraas Eiendomsselskap AS | Real estate | 2016 |
| Tveteraas Finans AS | Professional & scientific | 1998 |
| Tveteraas Holding AS | Real estate | 2016 |
| Tveteraas Invest AS | Real estate | 2016 |
| Twins Eiendom AS | Real estate | 2012 |