| B.G Holding AS | | 2020 |
| B.R. Holding AS | Wholesale & retail | 2016 |
| B.U Holding AS | Professional & scientific | 2024 |
| B2 Forvaltning AS | Professional & scientific | 2014 |
| B5 Holding AS | Information & communication | 2024 |
| B8 Investering AS | Real estate | 1990 |
| Baan Thai Takeaway AS | Hospitality | 2013 |
| Baci AS | Real estate | 2005 |
| Backen Veterinærpraksis AS | Professional & scientific | 2010 |
| Bagri Invest AS | Real estate | 2015 |
| Bagstevold Invest AS | | 2026 |
| Bak Døra Da | Arts & recreation | 2025 |
| Bakelink AS | Wholesale & retail | 2005 |
| Bakke Sørensen AS | Professional & scientific | 1995 |
| Bakkebo AS | Professional & scientific | 2021 |
| Bakkedammen AS | Real estate | 1998 |
| Bakken Engineering AS | Professional & scientific | 2018 |
| Bakken Kiosk & Grill Da | Wholesale & retail | 2013 |
| Bakken Vel | Other services | 2012 |
| Baksås Skog Da | Agriculture & fishing | 2010 |
| Balance Your Health AS | Wholesale & retail | 2010 |
| Balder Bilskade AS | Other services | 2018 |
| Ballestad Consulting AS | Real estate | 2026 |
| Ballestad Holding AS | | 2025 |
| Ballong & Partygrossisten AS | Wholesale & retail | 1989 |
| Bamblekilen Skog Holding AS | | 2017 |
| Bambleveien 49 AS | Real estate | 2021 |
| Bananita AS | | 2022 |
| Bane Eiendom Holding AS | Real estate | 2025 |
| Bankers AS | Professional & scientific | 1994 |
| Bany AS | Other services | 2001 |
| Bar-Zone AS | Wholesale & retail | 2017 |
| Barber Corner AS | Other services | 2023 |
| Bareror.No AS | Construction | 2017 |
| Barkaden Skien AS | Hospitality | 2018 |
| Barnehagen Gregorius AS | Education | 2003 |
| BARNEROMMET DA Kari Østbye Pedersen Geir Østbye Pedersen | | 1990 |
| Bas Holding AS | Professional & scientific | 2005 |
| Basel AS | Manufacturing | 2005 |
| Bastian G Holding AS | | 2020 |
| Bataljonsveien 30 AS | Real estate | 2006 |
| Bataljonveien 11 AS | Real estate | 2011 |
| Bataljonveien 27 AS | Real estate | 1987 |
| Batec AS | Professional & scientific | 2016 |
| Batjak AS | Real estate | 1991 |
| Batne AS | Administrative & support | 2008 |
| Batne Holdco AS | | 2026 |
| Batteributikken AS | Wholesale & retail | 2020 |
| BB Property AS | Real estate | 2022 |
| Bbvt Drift AS | Administrative & support | 2020 |
| Beable AS | Information & communication | 2013 |
| Beats AS | Professional & scientific | 2024 |
| Beautylines AS | Other services | 2020 |
| Bedriftsagenten AS | Professional & scientific | 2003 |
| Bedriftsagenten Invest AS | | 2023 |
| Bedriftsvegen 11 AS | Real estate | 2021 |
| Bedriftsvegen 42 Invest AS | Real estate | 2020 |
| Bedriftsvegen 64 AS | Real estate | 2011 |
| Bedriftsvegen 86 AS | Real estate | 2023 |
| Bedriftsvegen 92 AS | Real estate | 2016 |
| Bedriftsvegen 92 Holding AS | Real estate | 2021 |
| Bedriftsvegen AS | | 2025 |
| Bedriftsveien 100 AS | Real estate | 2015 |
| Bedriftsveien 30 AS | Real estate | 2008 |
| Bedriftsveien 52/58 AS | Real estate | 1986 |
| Bedriftsveien 68 AS | Real estate | 2006 |
| Beff Eiendom AS | Real estate | 2012 |
| Behfa AS | Real estate | 2020 |
| Behs AS | Professional & scientific | 2021 |
| Bekkedal AS | Real estate | 1980 |
| Bekkefaret Heistad AS | Administrative & support | 2025 |
| Bekker AS | | 2022 |
| Bella Pizza Burlacu AS | Hospitality | 2024 |
| Bem Eiendomsutvikling AS | Real estate | 2020 |
| Bemax AS | Wholesale & retail | 2004 |
| Bendik & Co AS | Administrative & support | 2023 |
| Bentes Blomster Og Gaver AS | Wholesale & retail | 1994 |
| Bentes Klinikk AS | Education | 2021 |
| Berg Gynekologi AS | Health & social care | 2021 |
| Berg Mur & Flis AS | Construction | 2015 |
| Bergan & Ståland AS | Wholesale & retail | 1999 |
| Bergan Holding AS | Wholesale & retail | 2005 |
| Bergbys Sennep AS | Manufacturing | 2015 |
| Berger-Eiendom AS | Real estate | 2015 |
| Bergsland Eiendom AS | Real estate | 1997 |
| Bergsli Metallmaskiner AS | Wholesale & retail | 2011 |
| Bergsli Treteknikk AS | Wholesale & retail | 2005 |
| Bergsli-Hantek AS | Wholesale & retail | 2014 |
| Bergstrøm Utleie AS | Administrative & support | 2025 |
| Bergsund Invest AS | Professional & scientific | 2016 |
| Berit Sivertsen Holding AS | Financial services | 2016 |
| Bernina Søm Og Strikk AS | Wholesale & retail | 1996 |
| Bervikåsen Boligfelt AS | Real estate | 2013 |
| Besso AS | Hospitality | 2007 |
| Besso Turisthytte AS | Hospitality | 2018 |
| Best Eiendomsmegler AS | Real estate | 2013 |
| Bestul Jakthus AS | Hospitality | 2020 |
| Bet Eiendom AS | Real estate | 2011 |
| Betanien Hospital Skien AS | Health & social care | 2025 |
| Beto AS | Real estate | 1996 |