| Bjørdal Og Moen Ans | Wholesale & retail | 1994 |
| Bjørgan Invest AS | Real estate | 2010 |
| Bjørgan Og Linden AS | | 2025 |
| Bjørka - Søtt Fra Sparbu AS | Manufacturing | 2026 |
| Bjørks Kontor AS | Real estate | 1997 |
| Bjørktun Invest AS | | 2021 |
| Bjørn Aage Nilsen Holding AS | Real estate | 2010 |
| Bjørn Kvaran Holding AS | Health & social care | 2005 |
| Bjørn Rygg Holding AS | | 2022 |
| Bjørnes AS | Health & social care | 2001 |
| Bjørnes Holding AS | | 2025 |
| BK Stena AS | Professional & scientific | 2024 |
| Bk-Investering AS | Administrative & support | 2024 |
| Bka Management Consulting AS | Financial services | 2015 |
| Blikkenslager Tommy Belsaas AS | Construction | 2018 |
| Blomsterspiren Steinkjer AS | Wholesale & retail | 2025 |
| Blondie Logistique AS | Transport & logistics | 2013 |
| Blooming Life AS | Health & social care | 2025 |
| Boa Bil Og Henger AS | Wholesale & retail | 2022 |
| Bobla AS | Real estate | 1998 |
| Bogavegen 20 AS | Real estate | 1994 |
| Bogaveien 7 AS | Real estate | 1998 |
| Bogaveien Eiendom AS | Real estate | 2020 |
| Boli Eiendomsmegling AS | Real estate | 2009 |
| Bom I Bilde AS | Information & communication | 2026 |
| Bomo Holding AS | Hospitality | 2002 |
| Bomo Invest AS | | 2012 |
| Bomveien 13 AS | Real estate | 2000 |
| Bomveien 3 Ans | Real estate | 1986 |
| Bomveien 3 AS | Real estate | 2009 |
| Bondens Beste AS | Wholesale & retail | 2024 |
| Borgas AS | Professional & scientific | 2007 |
| Borgetun AS | Health & social care | 2012 |
| Borgetun Da | Health & social care | 2021 |
| BP Malerservice AS | Professional & scientific | 2015 |
| Brandheia Villmarksleir AS | Real estate | 2003 |
| Brandsegg/Fossem Maskinlag Da | Agriculture & fishing | 2006 |
| Brandtsegg Invest AS | Financial services | 2017 |
| Bratberg Holding AS | | 2015 |
| Breidablikkgården AS | Real estate | 1996 |
| Bremset Arkitektkontor AS | Professional & scientific | 1998 |
| Brenne Fritid AS | Real estate | 2012 |
| Brenneriet Eiendom AS | Real estate | 2016 |
| Brosveet Holding AS | Financial services | 2014 |
| Brugata 2-4 Eiendom AS | Real estate | 2006 |
| BRV Maskinlag Da | Agriculture & fishing | 2005 |
| Brønlund/Jonassen Ans | Administrative & support | 2003 |
| BS Bygg Steinkjer AS | Construction | 2014 |
| Bud & Distribusjon AS | Transport & logistics | 2025 |
| Build and Run AS | Information & communication | 2018 |
| Bunnpris Guldbergaunet AS | Wholesale & retail | 1995 |
| By Brenneri AS | Manufacturing | 2017 |
| By Brug AS | Agriculture & fishing | 1896 |
| Byavegen 57 AS | Real estate | 2008 |
| Byavegen 59 AS | Real estate | 2008 |
| Bye Eiendom AS | Real estate | 1994 |
| Byggmester Asle Landrø AS | Construction | 2011 |
| Byggmester Binde AS | Construction | 2015 |
| Byggmester Forås AS | Construction | 2025 |
| Byggmester Ingar Modell AS | Construction | 2012 |
| Byggmester Knut Kjerkol AS | Construction | 2018 |
| Bygningsvern Og Restaurering AS | Wholesale & retail | 2025 |
| Bymiljø AS | Manufacturing | 1989 |
| Bålkaffe AS | Information & communication | 2026 |
| Bård Brøndbo AS | Transport & logistics | 2016 |
| Bækken Service AS | Other services | 2025 |
| Bøgda Catering AS | Hospitality | 2025 |
| Børgefjell AS | Real estate | 2011 |
| C-Jay AS | | 2024 |
| Cafe Madam Brix AS | Hospitality | 2014 |
| Camerat AS | Information & communication | 1998 |
| Cantor Kaffe AS | Wholesale & retail | 2026 |
| Capp AS | Information & communication | 2017 |
| Capus Midt AS | Professional & scientific | 2023 |
| Carolin Eiendom AS | Real estate | 1998 |
| Cenec Tavlebygg AS | Manufacturing | 2008 |
| Chef Steinkjer AS | Hospitality | 2019 |
| Clever Invest AS | Wholesale & retail | 2017 |
| Col Snekkeri AS | Construction | 2018 |
| Coldfeet Invest AS | Construction | 2011 |
| Corget Invest AS | | 2020 |
| Crunch Steinkjer AS | Hospitality | 2026 |
| Cudo AS | Professional & scientific | 2025 |
| Curam AS | Real estate | 2010 |
| Cuvee AS | | 2025 |
| CV Helse AS | Health & social care | 2025 |
| CV Invest AS | | 2024 |
| Dahls Frisør AS | Other services | 2012 |
| Daleie AS | Real estate | 2009 |
| Damir AS | Real estate | 2022 |
| Dampen-Steinkjer AS | Health & social care | 2022 |
| Dampsaga Dagligvare AS | Wholesale & retail | 2015 |
| Dampsaga Kulturbygg AS | Real estate | 1990 |
| Dampsaga Næringsbygg AS | Real estate | 1995 |
| Datapower Learning AS | Information & communication | 1996 |
| Datapower Skole AS | Education | 2021 |
| Datapower Skoledrift AS | Education | 2025 |
| Dean AS | Other services | 2006 |
| Dehli Inkasso AS | Administrative & support | 2014 |
| Dekk & Bilservice AS | Other services | 2013 |