| Trønder Renhold AS | Administrative & support | 2017 |
| Trønder-Sveis AS | Construction | 1988 |
| Trønder-Sveis Eiendom AS | Financial services | 2005 |
| Trønderbladet AS | Information & communication | 1958 |
| Trønderlinjen AS | Other services | 1986 |
| Trøndermelk Da | Agriculture & fishing | 2008 |
| Trøndermelk Eiendom AS | Real estate | 2008 |
| Trønderpotet SA | Wholesale & retail | 1965 |
| Trøndervet AS | Professional & scientific | 2011 |
| Ts-Invest AS | Professional & scientific | 2005 |
| Tubing Tec AS | Professional & scientific | 2023 |
| Turid Rekstad Holding AS | | 2026 |
| Twimets Capital AS | | 2026 |
| TZ Bygg Da | Construction | 2019 |
| Tøndels Autoservice AS | Real estate | 1977 |
| Valås Myhr Holding AS | Professional & scientific | 2017 |
| Vareflyt AS | Wholesale & retail | 2009 |
| Vaslag Eiendom AS | Real estate | 2007 |
| Vaslag Holding AS | Real estate | 2005 |
| Vekst Melhus AS | Health & social care | 1999 |
| Vekst Melhus Holding AS | Education | 2022 |
| Vekst Melhus Tjenester AS | Administrative & support | 2022 |
| Velø Holding AS | | 2021 |
| Verdexa AS | Real estate | 2022 |
| Vestre Vassfjell Grunneierlag | Real estate | 1995 |
| Victory Invest AS | | 2005 |
| Vidar Holding AS | | 2020 |
| Vigda AS | Professional & scientific | 2015 |
| Vigdal VVS AS | Construction | 2022 |
| Villmarksmessa Melhus AS | Real estate | 2023 |
| Vimph AS | Real estate | 2019 |
| Vitagile AS | Wholesale & retail | 2013 |
| Vitra Eiendom AS | Real estate | 2013 |
| Vitra Holding AS | Wholesale & retail | 2013 |
| VLW Racing AS | Arts & recreation | 2019 |
| VM Asset AS | | 2026 |
| Wagner Savoy Melhus AS | Wholesale & retail | 2020 |
| Webly Da | Information & communication | 2006 |
| Wellpower Technologies AS | Professional & scientific | 2023 |
| Wiem Holding AS | Financial services | 2015 |
| Wisbygg AS | Hospitality | 2005 |
| Wisemed AS | Education | 2026 |
| Woodstokk AS | Manufacturing | 2024 |
| WPT Engineering AS | Professional & scientific | 2025 |
| Ymiraqua AS | Information & communication | 2025 |
| Ze-Sam Holding AS | Other services | 2019 |
| Zimmerlund AS | Wholesale & retail | 2015 |
| ZL Bygg AS | Construction | 2019 |
| Zoocare AS | Wholesale & retail | 2025 |
| Åge Sten Nilsen AS | Arts & recreation | 2012 |
| Åsveien 164 AS | Real estate | 2014 |
| Åsveien Eiendom AS | Real estate | 2019 |
| Økonomipartner Norge AS | Professional & scientific | 2019 |
| Øyaas Elektro AS | Construction | 2003 |
| Øyberget Eiendom AS | Real estate | 2012 |
| Øybergvegen 43 AS | Real estate | 2021 |
| Øysand Bygg AS | Real estate | 2020 |
| Øysand Camping AS | Hospitality | 1991 |
| Øysand Maskinlag Da | Construction | 2005 |
| Øysand Motor AS | Other services | 2025 |
| Øysand Næring AS | Wholesale & retail | 2007 |
| Øysand Storbilvask AS | Other services | 2022 |
| Øysand Øst AS | Real estate | 2010 |
| Øyvind Onsøyen | Agriculture & fishing | 2013 |
| Øyås Utvikling AS | Real estate | 2025 |