| A-H-Tjenester AS | Construction | 2022 |
| Akseth Holding AS | Wholesale & retail | 2024 |
| Amf'En Holding AS | | 2026 |
| Amundsen Auto AS | Wholesale & retail | 2025 |
| Annas Frisørsalong AS | Other services | 2016 |
| Ans Huldrebua | Manufacturing | 1990 |
| Bakåsfall AS | Arts & recreation | 2023 |
| Bergsmo Maskinlag SA | Agriculture & fishing | 1995 |
| Bjørgan Skianlegg SA | Arts & recreation | 2016 |
| Bjørgan Skisenter AS | Arts & recreation | 2011 |
| Bjørgan Utbyggingsselskap AS | Real estate | 2007 |
| Bjørgan Utmarkslag SA | Real estate | 2022 |
| Bjørn Fornes Byggevarer AS | Wholesale & retail | 1999 |
| Bygg Og Industritjenester AS | Construction | 2014 |
| Ce Eiendom AS | Real estate | 2011 |
| Comfort Bjørn Seem AS | Construction | 2015 |
| Eliasmoen 1 AS | Real estate | 2017 |
| Elvelangs Namsen SA | Professional & scientific | 2020 |
| Eoka AS | | 2023 |
| Espelund Maskin AS | Construction | 2022 |
| Estensen Multiservice AS | Agriculture & fishing | 2022 |
| Even Hepsø Berg AS | Wholesale & retail | 2026 |
| Fdv-Vaktmestern AS | Administrative & support | 2011 |
| Fiskum Consult AS | Professional & scientific | 2022 |
| Fjellapa AS | Professional & scientific | 2022 |
| Formofoss Næringspark AS | Real estate | 2014 |
| Fornes Eiendom AS | Real estate | 1995 |
| Forsikring Helgeland AS | Financial services | 2014 |
| Friskgården Namdal AS | Health & social care | 2002 |
| Frøyen Byggservice AS | Construction | 2026 |
| Føynum Holding AS | Professional & scientific | 2022 |
| Gartland Samdrift Da | Agriculture & fishing | 2011 |
| Garva AS | Administrative & support | 2026 |
| Gasth AS | Hospitality | 2014 |
| Gjersvika Brøytestasjon AS | Real estate | 2022 |
| Grong Auto AS | Wholesale & retail | 2026 |
| Grong Autosalg AS | Wholesale & retail | 2011 |
| Grong Bilservice AS | Wholesale & retail | 1985 |
| Grong Boligbygg AS | Real estate | 2011 |
| Grong Dyreklinikk AS | Professional & scientific | 2006 |
| Grong El-Kontroll AS | Construction | 2021 |
| Grong Elektro AS | Construction | 1998 |
| Grong Fritid SA | Administrative & support | 1985 |
| Grong Graveservice AS | Construction | 2021 |
| Grong Gård Gjestegård AS | Hospitality | 2014 |
| Grong Holding AS | Real estate | 1991 |
| Grong Hotell AS | Hospitality | 2015 |
| Grong Innkjøpslag SA | Wholesale & retail | 1931 |
| Grong Kino SA | Information & communication | 1974 |
| Grong Kjøpesenter AS | Real estate | 2019 |
| Grong Maskinservice AS | Administrative & support | 2021 |
| Grong Minipris AS | Wholesale & retail | 1992 |
| Grong Næringsbygg AS | Real estate | 1998 |
| Grong Rør AS | Construction | 2014 |
| Grong Sparebank | Financial services | 1862 |
| Grong Taxi AS | Transport & logistics | 2017 |
| Grong Terrassen Restaurant & Pizzeria AS | Hospitality | 2020 |
| Grong Trafikksenter AS | Wholesale & retail | 2003 |
| Grongmelk Eiendom AS | Real estate | 2015 |
| Heia Gjestegård AS | Hospitality | 2018 |
| Holterbygg AS | Construction | 2016 |
| In-Vest AS | Financial services | 1997 |
| Ingers Helse Og Velvære AS | Health & social care | 2020 |
| Intersport Grong AS | Wholesale & retail | 2019 |
| Jakt Og Friluftsliv AS | Wholesale & retail | 2018 |
| Japp Utvikling AS | Real estate | 2022 |
| Jenas Eiendom AS | Real estate | 2018 |
| Josef Taraldsen AS | Wholesale & retail | 2024 |
| Julanta AS | Manufacturing | 2023 |
| Kafe Kroken AS | Hospitality | 2016 |
| Kmoe AS | Real estate | 2020 |
| Kneppin Utbygging AS | Real estate | 2018 |
| Knut Sklett AS | Agriculture & fishing | 2021 |
| Kråbøl Elektro AS | Construction | 2011 |
| Langnes Camping AS | Hospitality | 1990 |
| Leir Samdrift Da | Agriculture & fishing | 2003 |
| Leksås Gårdsmat AS | Wholesale & retail | 2019 |
| Leksås Invest AS | Real estate | 2014 |
| Leksås Sport AS | Real estate | 1986 |
| Li-La Holding AS | | 2021 |
| Mas-Sam Grong SA | Agriculture & fishing | 1994 |
| Mediåvollan Eiendom AS | Real estate | 2001 |
| Medøla Skogsvegforening | Real estate | 1995 |
| Melhusen&Moe AS | Construction | 2021 |
| Melhusen&Moe Eiendom AS | Real estate | 2025 |
| Memogel Eiendom AS | Real estate | 2025 |
| Mestalla AS | | 2006 |
| Mestring Og Helse AS | Health & social care | 2021 |
| MR Utvikling AS | Real estate | 2025 |
| Murmester Nilssen Eiendom AS | Real estate | 2025 |
| Musikkfestdagan I Grong AS | Administrative & support | 2023 |
| Namdal Byggservice Entreprenør AS | Construction | 1990 |
| Namdal Engineering AS | Professional & scientific | 1984 |
| Namdal Hus Og Hytte AS | Construction | 2014 |
| Namdal Landbrukstjenester SA | Agriculture & fishing | 1995 |
| Namdal Oljeservice AS | Wholesale & retail | 2026 |
| Namdal Tankrens AS | Water & waste | 1992 |
| Namdalsbryggeriet AS | Manufacturing | 2017 |
| Namsen Catering AS | Hospitality | 2023 |
| Namsentunet AS | Hospitality | 2011 |