| Balthazar Interior Oslo AS | Wholesale & retail | 2024 |
| Balthazar Investment AS | Professional & scientific | 2024 |
| Baltic Ans | Administrative & support | 1998 |
| Baltic Drive AS | Transport & logistics | 2025 |
| Baltic Equity AS | | 2021 |
| Baltic Sea Properties AS | Financial services | 2005 |
| Baltmont AB Nuf | Construction | 2018 |
| Balto AS | Real estate | 2005 |
| Baltos AS | | 2022 |
| Baltus Media AS | Arts & recreation | 2018 |
| Baltuz Holding AS | Financial services | 2016 |
| Baltzersen Skog Da | Agriculture & fishing | 2012 |
| Baltzersens Økonomiconsult AS | Professional & scientific | 2017 |
| Balub AS | | 2025 |
| Balubi AS | Information & communication | 2026 |
| Balvi AS | | 2020 |
| Balzam Interiør Da | Professional & scientific | 2023 |
| Bama Dagligvare AS | Wholesale & retail | 2010 |
| Bama Eiendom AS | Real estate | 2010 |
| Bama Ferske Drikker AS | Wholesale & retail | 1995 |
| Bama Gruppen AS | Wholesale & retail | 1914 |
| Bama International AS | Wholesale & retail | 1990 |
| Bama Invest AS | Professional & scientific | 2010 |
| Bama Logistikk AS | Transport & logistics | 1992 |
| Bama Pakkerier AS | Agriculture & fishing | 2010 |
| Bama Storkjøkken AS | Wholesale & retail | 2010 |
| Bama Storkjøkken Oslo AS | Wholesale & retail | 1984 |
| Bama Torgfrisk AS | Professional & scientific | 2015 |
| Bambam Invest AS | | 2025 |
| Bambino Pizza Da | Hospitality | 2000 |
| Bambola AS | | 2021 |
| Bamboo & Reed AS | Wholesale & retail | 2023 |
| Bamboo Bjerke AS | Hospitality | 2020 |
| Bamboo Sagene AS | Hospitality | 2020 |
| Bamboo Sagene Tran AS | Hospitality | 2026 |
| Bamboo Skøyen AS | Hospitality | 2020 |
| Bamboo Solutions AS | Information & communication | 2017 |
| Bamboo Uranienborg AS | Hospitality | 2020 |
| Bamboost AS | Professional & scientific | 2019 |
| Bambora Device Nuf | Administrative & support | 2006 |
| Bambora Norge Nuf | Financial services | 2015 |
| Bambus Invest AS | | 2016 |
| Bambus Sushi AS | Hospitality | 2011 |
| Bameri Holding AS | | 2022 |
| Bamno AS | Professional & scientific | 2015 |
| Bamosa AS | | 2018 |
| Bams Invest AS | Professional & scientific | 2017 |
| Bamsebo - Sio Barnehage AS | Education | 2022 |
| Bamsebo Familiebarnehage AS | Education | 2022 |
| Bamsebua Elisabeth W Og Cato Boye Ans | Wholesale & retail | 1986 |
| Bamseveien Holding AS | Financial services | 2016 |
| Banack Transport Nuf | Wholesale & retail | 2021 |
| Banan II AS | Real estate | 2015 |
| Banan Invest AS | | 2024 |
| Banana for Scale AS | Wholesale & retail | 2023 |
| Banana Stand AS | Financial services | 2013 |
| Bananer AS | | 2021 |
| Banarsi Norway AS | Manufacturing | 2024 |
| Bancroft AS | | 2021 |
| Band Faen Da | Arts & recreation | 2024 |
| Bandagistkjeden AS | Administrative & support | 1995 |
| Bandai Namco Games Nordic AB | Information & communication | 2009 |
| Bandar Holding AS | Financial services | 2017 |
| Bandkassa Holding AS | | 2023 |
| Bands Medical AS | Wholesale & retail | 2025 |
| Bane Elektro AS | Professional & scientific | 2016 |
| Bane Nor Eiendom AS | Real estate | 1998 |
| Bane Nor Forsikring AS | Financial services | 2020 |
| Bane Nor Serviceeiendom AS | Real estate | 2016 |
| Banebakken 38 AS | Real estate | 2015 |
| Banekonsult AS | Professional & scientific | 2022 |
| Baneservice AS | Construction | 2003 |
| Bang & Olufsen AS | Wholesale & retail | 1968 |
| Bang & Partners AS | Professional & scientific | 2026 |
| Bang Rådgivning AS | Professional & scientific | 2022 |
| Bang-Ellingsen Rekruttering AS | Professional & scientific | 2026 |
| Bang-Hansen Advokatfirma AS | Professional & scientific | 2019 |
| Bang:Mørken Ans | Information & communication | 2009 |
| Bangbang Watergun Da | Arts & recreation | 2021 |
| Bangers AS | Arts & recreation | 2025 |
| Bangkok Blonde AS | Wholesale & retail | 2025 |
| Bangkok Diner AS | Hospitality | 2024 |
| Bangles & Brass Records AS | Arts & recreation | 2015 |
| Banh Mi Xo AS | Hospitality | 2019 |
| Banhammaren 25 AS | Real estate | 2022 |
| Banijay Norway AS | Information & communication | 2010 |
| Banio AS | Other services | 2023 |
| Banjo Invest AS | Financial services | 2008 |
| Banjonassen AS | Arts & recreation | 2024 |
| Bank Gran Consulting AS | Professional & scientific | 2023 |
| Bankaktiebolaget Nordiska (Publ) Nuf | Financial services | 2024 |
| Bankapp AS | Professional & scientific | 2025 |
| Bankaxept AS | Information & communication | 2018 |
| Bankgarasjene, Bjørnsletta SA | Real estate | 1953 |
| Bankhaugen AS | Real estate | 2006 |
| Bankid Norge AS | Information & communication | 2018 |
| Bankierhuset AS | | 1994 |
| Bankierhuset S T Evensen & Co Da | | 1988 |
| Banking Circle S.A. (Luxembourg) Nuf | Financial services | 2025 |
| Bankit AS | Information & communication | 2013 |