| Terje Reed AS | Agriculture & fishing | 1981 |
| TM Olsen Invest AS | | 2020 |
| Toppform Treningssenter AS | Arts & recreation | 1991 |
| Tor Hodne's Eftf Dagligvareservice AS | Wholesale & retail | 2006 |
| Torn Invest AS | Professional & scientific | 2024 |
| Torune Invest Da | Real estate | 2010 |
| Trekløver AS | Real estate | 2022 |
| Trequartista AS | Information & communication | 2024 |
| Trinestangeland AS | Professional & scientific | 2025 |
| Trinestangeland Holding AS | | 2026 |
| Uic AS | Professional & scientific | 2014 |
| Unique Communication AS | Professional & scientific | 2024 |
| Utstyrspartner AS | Wholesale & retail | 2017 |
| Velociraptor AS | | 2026 |
| Vemra Invest AS | | 2020 |
| Ventura-Holding AS | Real estate | 2020 |
| Verkvelven AS | Professional & scientific | 2014 |
| Vilama AS | | 2021 |
| Vormelaen AS | Wholesale & retail | 2016 |
| Vårlihøgda AS | Real estate | 1997 |
| Wadi Horizon Investment Group AS | | 2025 |
| Waste Up AS | Professional & scientific | 2022 |
| Waterfall Energy Partner AS | Professional & scientific | 2013 |
| Wig Holdings AS | Professional & scientific | 2024 |
| Xyzd AS | Professional & scientific | 2023 |
| Ydstebø Management Consulting AS | Administrative & support | 2000 |
| Ynwa Investment AS | Wholesale & retail | 2023 |
| Zenker Holding AS | Manufacturing | 2005 |
| Østerhus Holding AS | Financial services | 2005 |
| Østerhus Invest AS | Professional & scientific | 2005 |