| Tanntorget AS | Health & social care | 2005 |
| Tautra Båtlag SA | Real estate | 2005 |
| TDM Invest AS | | 2019 |
| Telegrafen AS | Real estate | 2002 |
| Telekiosken Brønnøysund AS | Wholesale & retail | 2010 |
| TH Bygg AS | Construction | 2024 |
| THP247 Holding AS | | 2025 |
| Tift Eiendom AS | Real estate | 2014 |
| Timstad Eiendom AS | Real estate | 2006 |
| Tindra Studio AS | Professional & scientific | 2026 |
| TMH Landbruk AS | Agriculture & fishing | 2015 |
| Toft Brygge AS | Real estate | 2001 |
| Toft Marina AS | Real estate | 2013 |
| Toftbuen AS | Agriculture & fishing | 2024 |
| Toftegård Da | Agriculture & fishing | 2022 |
| Togglebrick Holding AS | Information & communication | 2020 |
| Toilar AS | Agriculture & fishing | 2024 |
| Tore Holm & Sønn AS | Construction | 1989 |
| Torgar Montessoriskole AS | Education | 2024 |
| Torgarhaugen AS | Hospitality | 2004 |
| Torgarnes AS | Agriculture & fishing | 2019 |
| Torghatten AI AS | Information & communication | 2025 |
| Torghatten Aqua AS | Agriculture & fishing | 1997 |
| Torghatten Camping & Strandrestaurant AS | Hospitality | 2009 |
| Torghatten Group AS | Transport & logistics | 2020 |
| Torgøy AS | | 2021 |
| Tosan Consulting AS | Professional & scientific | 2026 |
| Total Sør-Helgeland Eiendom AS | Real estate | 2005 |
| Trafikkskolen Brønnøysund AS | Education | 1998 |
| Tromsø Busscharter AS | Transport & logistics | 2013 |
| Truck Tek AS | Manufacturing | 1996 |
| Trælnes Eiendom AS | Real estate | 2007 |
| Trælnes Holding AS | Real estate | 2007 |
| Trælnes Multimedia AS | Professional & scientific | 2016 |
| Trøndelag Helgeland Invest AS | Agriculture & fishing | 1997 |
| Trøndermoe Eiendom AS | Real estate | 2013 |
| TTS Bil Og Dekksenter AS | Other services | 1994 |
| Tumen AS | Health & social care | 2005 |
| Tømrer Teamet AS | Construction | 2019 |
| Tørrfiskbrygga SA | Real estate | 2025 |
| Ullbuksa AS | Wholesale & retail | 2020 |
| Unik-Frisørene AS | Other services | 2017 |
| Urs-Urs Re AS | Professional & scientific | 2022 |
| Vaaganco AS | Transport & logistics | 2022 |
| Vassheia Eiendom AS | Construction | 2019 |
| Veivalg AS | Health & social care | 2012 |
| Verdande AS | Construction | 2017 |
| Vex Frisør Brønnøysund AS | Other services | 2020 |
| Vibeculture AS | Information & communication | 2026 |
| Vidar Bendiksen Holding AS | Construction | 2018 |
| VISUAL360 AS | Information & communication | 2022 |
| VT Multi Service AS | Manufacturing | 2024 |
| Vågan Arkitektkontor AS | Professional & scientific | 2023 |
| Warholmen Holding AS | | 2025 |
| Warmek AS | Manufacturing | 2025 |
| Wennevik Holding AS | Hospitality | 2023 |
| Zum Regnskap AS | Professional & scientific | 2026 |
| Årtua Eiendom AS | Real estate | 2023 |
| Åsberg Holding AS | Financial services | 2005 |
| Åsletten Service AS | Construction | 2024 |
| Åsveien 33 AS | Real estate | 1987 |
| Ødegaard Anlegg AS | Construction | 2008 |
| Øyvind Ellingsen AS | Construction | 2015 |