| Bekkegaten 2 AS | Real estate | 2015 |
| Bel Service AS | Wholesale & retail | 2024 |
| Bella Vista Holmestrand AS | Hospitality | 2020 |
| Belmare AS | Hospitality | 2023 |
| Bentsrud Eiendom AS | Real estate | 2024 |
| Bentsrudveien 14 AS | Real estate | 2018 |
| Bentsrudveien 1B AS | Real estate | 2012 |
| Bentsrudveien 3/6 Eiendom AS | Real estate | 1962 |
| Bentsrudveien 5 AS | Construction | 2017 |
| Bentsrudveien 7 Eiendom AS | Real estate | 1989 |
| Berglund Arkitektur AS | Professional & scientific | 2020 |
| Bestbil AS | Wholesale & retail | 2018 |
| Betongsentrum AS | Information & communication | 2018 |
| Bi-Invest AS | | 2026 |
| Bil & Båtrekvisita AS | Wholesale & retail | 2000 |
| Bilbjørn AS | Wholesale & retail | 1988 |
| Bilbjørn Eiendom AS | Real estate | 2021 |
| Bilflyt AS | Wholesale & retail | 2026 |
| Biobygg Ltd Nuf | Wholesale & retail | 2014 |
| Bjorjoh AS | Professional & scientific | 2019 |
| Blikkenslagermester Tormod Gretteberg AS | Construction | 2023 |
| Blueprint Tekstiltrykk Ans | Manufacturing | 2000 |
| BMB Barnehage AS | Education | 2024 |
| BMK AS | Wholesale & retail | 2005 |
| Bodø Bilsalg AS | Wholesale & retail | 2019 |
| Bondens Marked Vestfold SA | Wholesale & retail | 2017 |
| Borgen Forsamlingslokale SA | Real estate | 2018 |
| Borgentoppen AS | Real estate | 2024 |
| Bortigard AS | Construction | 1975 |
| Botne Og Hillestad Utmarkslag | Agriculture & fishing | 1947 |
| Botnebygg AS | Construction | 2010 |
| Boutique 19 AS | Wholesale & retail | 2021 |
| Boutique 63 AS | Wholesale & retail | 2012 |
| Boutique Gran AS | Wholesale & retail | 2022 |
| Boutique Grensen AS | Wholesale & retail | 2016 |
| Boutique Gulskogen AS | Wholesale & retail | 2016 |
| Boutique Hamar AS | Wholesale & retail | 2021 |
| Boutique Harebakken AS | Wholesale & retail | 2013 |
| Boutique Herkules AS | Wholesale & retail | 2012 |
| Boutique Horisont AS | Wholesale & retail | 2014 |
| Boutique Jekta AS | Wholesale & retail | 2020 |
| Boutique Kvadrat AS | Wholesale & retail | 2019 |
| Boutique Markens AS | Wholesale & retail | 2016 |
| Boutique Metro AS | Wholesale & retail | 2013 |
| Boutique Nord AS | Wholesale & retail | 2020 |
| Boutique Strømmen AS | Wholesale & retail | 2020 |
| Boutique Sør AS | Wholesale & retail | 2019 |
| Boutique Triaden AS | Wholesale & retail | 2023 |
| Boutique Trondheim AS | Wholesale & retail | 2014 |
| Boutique Åsane AS | Wholesale & retail | 2023 |
| BP Travel AS | Administrative & support | 2026 |
| BPC Holding AS | Professional & scientific | 2022 |
| Brajobba AS | Other services | 2015 |
| Brdr Hansen Ans | Construction | 1986 |
| Brekke Anlegg AS | Construction | 2023 |
| Brekke Bygg AS | Real estate | 2015 |
| Brekke Maskin AS | Construction | 2001 |
| Brekke Maskindrift AS | Construction | 2019 |
| Brekke Sanitær AS | Construction | 1997 |
| Brenner for Design AS | Professional & scientific | 2013 |
| Brillemann AS | Wholesale & retail | 2003 |
| Bringakerveien 1 AS | Real estate | 2015 |
| Bruktbilplassen AS | Wholesale & retail | 2021 |
| Bræin Bil Og Maskinservice AS | Manufacturing | 2016 |
| Brødrene Fjerdingstad AS | Information & communication | 2021 |
| Brødrene Høisæt AS | Manufacturing | 2020 |
| Brødrene Koteng AS | Administrative & support | 2012 |
| Brødrene Kvan Da | | 2026 |
| BTB Eiendom AS | Real estate | 2016 |
| Bu Holdingselskap AS | Construction | 2016 |
| Bu Landbruk Da | Agriculture & fishing | 2019 |
| Build Green AS | Wholesale & retail | 2025 |
| Buketten Blomster AS | Wholesale & retail | 2014 |
| Burgerbill AS | Hospitality | 2026 |
| Burmaveien Bod 03-04 AS | Real estate | 2024 |
| Business for Hope AS | Wholesale & retail | 2025 |
| BWP Consulting AS | Information & communication | 2021 |
| BWP Holding AS | Information & communication | 2021 |
| Byes Installasjon AS | Construction | 2019 |
| Byggmester Sjur Holt AS | Construction | 2020 |
| Byggrent-Din Renholdspartner AS | Administrative & support | 2011 |
| C-Vita AS | Wholesale & retail | 2001 |
| C.T.J Invest AS | | 2022 |
| Cafe Kullboden Da | Hospitality | 1999 |
| Cakn Holding AS | Mining & quarrying | 2022 |
| Calex Invest AS | Real estate | 2005 |
| Cambio Invest AS | Real estate | 2005 |
| Cana Holding AS | | 2024 |
| Casablanca Pizzabar AS | Hospitality | 2021 |
| Caskhunters AS | Wholesale & retail | 2018 |
| Catos Betongsaging AS | Construction | 2014 |
| CC Betong AS | Construction | 2015 |
| Center Import AS | Wholesale & retail | 2012 |
| CF Revetal AS | Arts & recreation | 2019 |
| Charge Amps Norge AS | Wholesale & retail | 2021 |
| Charlotte MSK AS | Professional & scientific | 2023 |
| Charlottemsk Holding AS | | 2025 |
| Chivirico AS | Wholesale & retail | 2006 |
| Christian Døhl AS | Water & waste | 2010 |
| CK Drift AS | Mining & quarrying | 2022 |