| Birkebeiner Invest AS | Real estate | 2016 |
| Birkebeinervegen 26 AS | Real estate | 1999 |
| Birkebeinerveien AS | Real estate | 2001 |
| Bjerke Konsulenttjenester AS | Health & social care | 2025 |
| Bjerkås Holding AS | | 2020 |
| Bjørge Transport AS | Transport & logistics | 2022 |
| Bjørk Agentur Ans | Wholesale & retail | 1996 |
| Bjørn Frode Kvernstuen AS | Information & communication | 2025 |
| Bjørnstad Invest AS | Real estate | 2006 |
| Bjørtomt Eiendom AS | Real estate | 2021 |
| Bjørtomt Holding AS | Wholesale & retail | 2021 |
| BK Trading AS | Transport & logistics | 2021 |
| Blackcircle Holding AS | | 2023 |
| Blest Invest AS | | 2025 |
| Blittlurt.No AS | Information & communication | 2026 |
| Blomsterenga AS | Real estate | 2020 |
| Blystad Elektro AS | Construction | 2018 |
| Blåklokkevegen 6 AS | Real estate | 2023 |
| Blåklokkeveien 12 AS | Real estate | 2016 |
| Blåveisen Barnehage SA | Education | 1991 |
| Bno Invest AS | | 2024 |
| Bo Godt Eiendom AS | Real estate | 2024 |
| Bob Heis Holding AS | Construction | 2007 |
| Bobcat AS | Wholesale & retail | 2024 |
| Bolde AS | Wholesale & retail | 2022 |
| Bolig Partner AS | Construction | 1993 |
| Bolig Partner Prosjekt AS | Real estate | 2018 |
| Bolig Øst AS | Real estate | 2018 |
| Boligmax AS | Real estate | 2024 |
| Boligpartner Innlandet AS | Real estate | 2024 |
| Boligpartner Trehusene AS | Real estate | 2023 |
| Boligutvikling Hamar AS | Real estate | 2018 |
| Bolix AS | Real estate | 2022 |
| Boman AS | Information & communication | 2009 |
| Bona Copia AS | | 2021 |
| Bona Fide Eiendom AS | Real estate | 2020 |
| Bowling 1 Eiendom AS | Real estate | 2019 |
| Bowling 1 Holding AS | Arts & recreation | 2000 |
| BP Gruppen Norge AS | Real estate | 1994 |
| Bra Regnskap AS | Professional & scientific | 2025 |
| Bragd Holding AS | Real estate | 2020 |
| Brave Capital AS | Professional & scientific | 2020 |
| Bravinor AS | | 2026 |
| Brekkhus Holding AS | | 2021 |
| Breogbratt AS | Professional & scientific | 2019 |
| Brevity Media AS | Information & communication | 2022 |
| Brightec Security AS | Construction | 2007 |
| Bringebærstedet AS | | 2023 |
| Briskeby Prosjekt AS | Real estate | 2021 |
| Briskebyen Eiendom AS | Real estate | 1994 |
| Briskebyen Montessori International AS | Education | 2010 |
| Briskebyen Spisested AS | Hospitality | 2015 |
| Brudehuset Hamar AS | Wholesale & retail | 2013 |
| Brudvik AS | Real estate | 2021 |
| Brugata 72 AS | Real estate | 2017 |
| Brugata AS | Real estate | 2021 |
| Brukshuset Hamar AS | Real estate | 1992 |
| Brustad-Holding AS | Real estate | 2018 |
| Brygga Invest AS | Real estate | 1975 |
| Bryggeriet 1 - 2 - 3 Drift SA | Real estate | 2012 |
| Bryggeriet Arena Ans | Real estate | 2011 |
| Bryggerigt. 42 AS | Real estate | 2011 |
| Bråss AS | Real estate | 2019 |
| Brødrene Øvergaard & Co Ans | | 1992 |
| Bucket AS | Wholesale & retail | 2025 |
| Budtjenesten Hamar Bilutleie AS | Transport & logistics | 2019 |
| Bukke AS | | 2023 |
| Bus Stop Hamar AS | Wholesale & retail | 1990 |
| Butikkdrift AS | Real estate | 2003 |
| Butikkservice AS | Wholesale & retail | 1998 |
| Buylink Øst AS | Wholesale & retail | 2025 |
| BVV Invest AS | Real estate | 2015 |
| Bygg Og Taksikring AS | Construction | 2022 |
| Byggeriet Invest AS | Construction | 2018 |
| Byvestli House AB | Professional & scientific | 2008 |
| Bækkelien Holding AS | Real estate | 2019 |
| Bæssmor AS | Professional & scientific | 2022 |
| C. Gulbrandsen Holding AS | | 2019 |
| C.Z-Sanit Dorota Kubica Miroslaw Kubica Spolka Jawna | Construction | 2005 |
| Caddiesoft Norge AS | Information & communication | 2020 |
| Café Gravdahl AS | Hospitality | 2019 |
| Camini AS | Wholesale & retail | 2022 |
| Caminives AS | | 2020 |
| Campaign Shark AS | Information & communication | 2025 |
| Campbell & Co Holding AS | Professional & scientific | 2005 |
| Canine Connections AS | Information & communication | 2023 |
| Cappilytix AS | Other services | 2024 |
| Carfreaks AS | Wholesale & retail | 2020 |
| Carfreaks Media AS | Professional & scientific | 2023 |
| Carmelo Pizzeria AS | Hospitality | 2026 |
| Casa Nora AS | | 2025 |
| Castrum Holding AS | | 2024 |
| Cavall AS | Wholesale & retail | 2021 |
| CC Bilpleie AS | Other services | 2018 |
| CC Dagligvare AS | Wholesale & retail | 1971 |
| CC Eiendom AS | Real estate | 1993 |
| CC Gruppen AS | Real estate | 2005 |
| CC Martn Eiendom AS | Real estate | 1991 |
| Ccccc AS | | 2021 |
| Chapagain AS | | 2024 |