| Takst Nor AS | Professional & scientific | 2023 |
| Tannlege Lise Bjerkerud AS | Health & social care | 2013 |
| Tannlege Per R Rust AS | Health & social care | 1989 |
| Tannlegegården AS | Real estate | 2011 |
| Tbø Håndverk Da | Construction | 2005 |
| TD Produksjon AS | Manufacturing | 2013 |
| Terbi AS | Professional & scientific | 2020 |
| Terum Holding AS | Real estate | 2008 |
| Thon & Co AS | Construction | 1984 |
| Thorgersen Maskin AS | Construction | 2023 |
| Thorn Energy Solution AS | Administrative & support | 2024 |
| TL Prosjekt AS | Professional & scientific | 2021 |
| Tomta Da | Real estate | 2004 |
| Tradisjonshaandtverk AS | Construction | 2003 |
| Troski Holding AS | | 2019 |
| TS Holding Modum AS | Construction | 2019 |
| Ttsa Holding AS | | 2024 |
| Tyrvi Eiendom AS | Real estate | 1993 |
| Tømrerfirma Johansen Og Bjørndal Ans | Construction | 1994 |
| Undervisningsmateriell AS | Wholesale & retail | 2020 |
| Uniliving AS | Real estate | 2023 |
| V. Strandbråten Holding AS | | 2020 |
| Va-Ra Regnskapsservice AS | Professional & scientific | 2014 |
| Vegar Hølen AS | | 2019 |
| Ver Holding AS | | 2021 |
| Veterinær Brun AS | Professional & scientific | 2026 |
| Viei Eiendom AS | Real estate | 2018 |
| Vikland Brygge SA | Arts & recreation | 2017 |
| Vtvb Eiendom AS | Real estate | 2021 |
| Wassend Holding AS | Financial services | 2017 |
| Wassend Ventures AS | | 2025 |
| Winther No Dig AS | Construction | 2001 |
| Wold & Borgersen AS | Other services | 1998 |
| Wold & Borgersen Eiendom AS | Real estate | 1938 |
| Wolfram Transport AS | Construction | 2019 |
| Woto AS | Construction | 2018 |
| Xdrive Auto AS | Wholesale & retail | 2023 |
| Yantell AS | Professional & scientific | 2021 |
| Yttri Entreprenør AS | Construction | 2026 |
| Zaklad Remontowo Budowlany Majocha Sylwester | Construction | 2008 |
| Zipps Skiwax AS | Wholesale & retail | 2005 |
| Åmot Bilsenter AS | Wholesale & retail | 2022 |
| Åmot Bilservice Verksted AS | Other services | 2024 |
| Åmot Blomster AS | Wholesale & retail | 2001 |
| Åmot Eiendom AS | Real estate | 1994 |
| Åmot Elektro AS | | 2024 |
| Åmot Fysikalske AS | Arts & recreation | 1998 |
| Åmot Legepraksis AS | Health & social care | 2013 |
| Åmot Legesenter Da | Health & social care | 2009 |
| Åmot Maling Da | Wholesale & retail | 2007 |
| Åmot Matsenter AS | Real estate | 1991 |
| Åsgard Eiendom AS | Real estate | 2016 |
| Åsheim Landbruk Og Invest AS | Agriculture & fishing | 2025 |
| Åsly Invest AS | Real estate | 1998 |
| Ødegård Maskin AS | Construction | 2023 |