| Tba Gruppen AS | Real estate | 2007 |
| Tba Prosjekt AS | Real estate | 2007 |
| Tbaed Invest AS | | 2020 |
| Team Bygg Og Eiendom AS | Real estate | 2001 |
| Tecso AS | Professional & scientific | 2023 |
| Tehnik AS | Information & communication | 2025 |
| Temple of Rock Da | Hospitality | 2006 |
| Thörel AS | | 2026 |
| TM Eiendomsservice AS | Administrative & support | 2021 |
| Tollboden Trans AS | Transport & logistics | 2023 |
| Tom R. Oppegaard Transport AS | Transport & logistics | 2007 |
| Toor Singh Transport AS | Transport & logistics | 2015 |
| Top Coat AS | Other services | 2023 |
| Topuz Transport & Logistics AS | Transport & logistics | 2025 |
| Toyota Romerike AS | Wholesale & retail | 1979 |
| TPJ Holding AS | | 2019 |
| Triolab AS | Wholesale & retail | 1992 |
| TRV 123 AS | Real estate | 2016 |
| TS Utvikling AS | Professional & scientific | 2007 |
| Tuterud Utvikling AS | Real estate | 2021 |
| Tvers Igjennom AS | Information & communication | 2026 |
| Ulti Tech AS | Professional & scientific | 2021 |
| Uptech Solutions AS | Information & communication | 2017 |
| Utleiecompagniet AS | Administrative & support | 1998 |
| Vakre Deg AS | Health & social care | 2025 |
| Varde Rør AS | Construction | 2023 |
| Vebcon AS | Professional & scientific | 2024 |
| Vertifiks AS | Manufacturing | 2016 |
| Vice Entreprenør AS | Construction | 2025 |
| Viken Fritid AS | Wholesale & retail | 2021 |
| Viken Revisjon Og Regnskap AS | Professional & scientific | 2021 |
| Vimar AS | Real estate | 2005 |
| Vitusapotek Kjeller AS | Wholesale & retail | 2021 |
| Vätgas Sverige - Avdeling Norge | Professional & scientific | 2012 |
| Wasa Teknikk Norge AS | Professional & scientific | 2013 |
| Xylem Water Solutions Norge AS | Wholesale & retail | 1966 |
| Åråsen Eiendom AS | Real estate | 1999 |
| Åråsen Stadion AS | Real estate | 1996 |
| Åråssvingen 10 AS | Real estate | 2020 |
| Åråssvingen 12 AS | Real estate | 2002 |
| Øe Bolig AS | Construction | 2011 |
| Øks Eiendom AS | Real estate | 2023 |
| Øre Invest AS | Real estate | 2014 |
| Østheim Byggfornyelse AS | Construction | 2018 |
| Østheim Eiendomsservice AS | Administrative & support | 2021 |
| Østheim Montasje AS | Construction | 2015 |