| BH Invest AS | Financial services | 2005 |
| BH Investments AS | | 2020 |
| BH Nordic AS | Wholesale & retail | 1993 |
| BH Selskap 1 AS | | 2024 |
| Bhandari Eiendom AS | Real estate | 2013 |
| Bharat Tankers Holding AS | | 2024 |
| BHB Invest AS | Real estate | 2004 |
| BHC Construction AS | Construction | 1992 |
| Bhie Holding AS | | 2015 |
| BHM Holding AS | Real estate | 2017 |
| Bhome Invest AS | | 2021 |
| BHR AS | | 2026 |
| BHS Invest AS | | 2026 |
| Bht-Gruppen SA | Health & social care | 1988 |
| Bhumi Ans | Wholesale & retail | 2008 |
| Bhuyin Consulting AS | Wholesale & retail | 2024 |
| Bi Bidco AS | Wholesale & retail | 2022 |
| Bi Partner Holding AS | | 2019 |
| Bi-Bygget D-Blokka AS | Real estate | 2005 |
| Bi-O Agro AS | Professional & scientific | 2019 |
| Bi-O AS | Professional & scientific | 2012 |
| Bi-Omstilling SA | Agriculture & fishing | 2021 |
| BI7 Kontor Holding AS | Financial services | 2016 |
| Biandol AS | Wholesale & retail | 2022 |
| Bias Trykk AS | Manufacturing | 1995 |
| Bibamus Invest AS | Financial services | 2007 |
| Bibba Norge AS | Wholesale & retail | 2010 |
| Bibbi AS | Real estate | 2000 |
| Bibby International Services (Guernsey)Ltd | Administrative & support | 2006 |
| Bibelskolen Fjellhaug AS | Education | 2005 |
| Biber AS | Wholesale & retail | 2021 |
| Bibesto Drive AS | Transport & logistics | 2019 |
| Bibi Prosjekt AS | Real estate | 1994 |
| Bibi Surf AS | | 2023 |
| Bibicava AS | Real estate | 2005 |
| Biblioteksentralen SA | Wholesale & retail | 1952 |
| Bibliotekshaven Næring AS | Real estate | 2006 |
| Biboja AS | Wholesale & retail | 2025 |
| Bic AS | Professional & scientific | 2007 |
| Biclever AS | Information & communication | 2025 |
| Biclever Software AS | Information & communication | 2026 |
| Bictech AS | | 2023 |
| Bid Auction House Limited | Real estate | 2022 |
| Bidbuddy AS | Information & communication | 2024 |
| Bidco 104 AS | | 2026 |
| Bidco AS | | 2022 |
| Bidco Brøset Nord Felt 1 AS | Real estate | 2024 |
| Bidco Clover AS | | 2025 |
| Bidco Compact AS | Arts & recreation | 2021 |
| Bidco Gi AS | | 2025 |
| Bidco Spirit AS | Health & social care | 2021 |
| Bidder AS | Information & communication | 2023 |
| Bidos AS | Real estate | 1998 |
| Bidragshjelpen AS | Other services | 2021 |
| Bie Hold. AS | | 2026 |
| Bie Holding AS | Real estate | 2013 |
| Bie Prosjektledelse AS | Professional & scientific | 2026 |
| Biejordene AS | Real estate | 1997 |
| Bielke&Yang AS | Professional & scientific | 2022 |
| Bien Amigos AS | | 2017 |
| Bien Eiendom AS | Real estate | 2006 |
| Bien Sparebank ASA | Financial services | 2007 |
| Biermann Invest AS | | 2023 |
| Biewa Invest AS | | 2023 |
| Biff House AS | Hospitality | 2022 |
| Bifflønsj AS | Arts & recreation | 2023 |
| Bifrost AS | Information & communication | 2026 |
| Bifrost Bolig AS | Real estate | 2018 |
| Bifrost Booking AS | Information & communication | 2020 |
| Bifrost Entertainment AS | Information & communication | 2012 |
| Bifrost Esport AS | Arts & recreation | 2019 |
| Bifrost Music AS | Professional & scientific | 2016 |
| Bifrost Outdoor AS | Information & communication | 2026 |
| Bifrost Utvikling AS | Real estate | 2019 |
| Bifrost Venture AS | | 2026 |
| Big Balls Da | Arts & recreation | 2002 |
| Big Bear Capital AS | Real estate | 2017 |
| Big Beefy AS | Hospitality | 2009 |
| Big Blue AS | Professional & scientific | 2016 |
| Big Blue Holding AS | Professional & scientific | 2016 |
| Big Box Denmark AS | Real estate | 2021 |
| Big Box Music AS | Information & communication | 1992 |
| Big Box Rygge AS | Real estate | 2007 |
| Big Box Vestby AS | Real estate | 2009 |
| Big Brother KB | Information & communication | 2001 |
| Big Bux AS | | 2023 |
| Big Calm Productions S.L. Nuf | Administrative & support | 2023 |
| Big Capital Norway AS | Professional & scientific | 2025 |
| Big Day Records AS | Information & communication | 2016 |
| Big Dipper AS | Wholesale & retail | 2006 |
| Big Fish AS | Professional & scientific | 2016 |
| Big Hold AS | Financial services | 2016 |
| Big Horn Steak House AS | Hospitality | 1989 |
| Big Horn Steakhouse Norge AS | Administrative & support | 1997 |
| Big Jerk Motel AS | Information & communication | 1998 |
| Big Mountain Holding AS | | 2025 |
| Big Orange AS | Wholesale & retail | 2014 |
| Big P Invest AS | Education | 2018 |
| Big Stack Invest AS | | 2020 |
| Big T Holding AS | Financial services | 2005 |