| Bil Og Bobil AS | Other services | 2010 |
| Bil Og Bobil Salg AS | Wholesale & retail | 1993 |
| Bil Og Bobil Vaskehall AS | Other services | 2020 |
| Bil Og Bobil Østerhus AS | Wholesale & retail | 2017 |
| Billigcamping DK Aps | Wholesale & retail | 2018 |
| Birketvedt Holding AS | | 2021 |
| Biscotto Stones International AS | Wholesale & retail | 2020 |
| Bjarnastein AS | Construction | 2019 |
| Bjarnastein Holding AS | Construction | 2019 |
| Bjellerås Entreprenørforretning AS | Construction | 1991 |
| Bjerglund Holding AS | Wholesale & retail | 2024 |
| Bjort Invest AS | | 2020 |
| Bjønneveien 9 AS | Real estate | 1997 |
| Bjønneveien 9 Holding AS | Real estate | 2019 |
| Bjørn Engen Brøyting & Transport AS | Transport & logistics | 2012 |
| Bjørn Engh AS | Information & communication | 2020 |
| Bjørumsvegen 2A AS | Real estate | 2021 |
| Bliksund AS | Information & communication | 2010 |
| Blå Kors Videregående Skole Grimstad AS | Education | 2019 |
| BMB Bygg AS | Construction | 2020 |
| Bobil & Caravan Grimstad AS | Wholesale & retail | 2025 |
| Bobil Eiendom Grimstad AS | Real estate | 2002 |
| Bobilutleie Sør Ans | Administrative & support | 2006 |
| Boelia AS | Professional & scientific | 2020 |
| Boligpartner Agder AS | Real estate | 2026 |
| Bona Fide Holding AS | | 2025 |
| Bondevik AS | Financial services | 2016 |
| Boomcar AS | Wholesale & retail | 1995 |
| Boreas Bio Resources AS | Professional & scientific | 2025 |
| Boreas Fertilizer AS | Agriculture & fishing | 2025 |
| Bortelid Eiendomsutvikling AS | Real estate | 2013 |
| Bortelid Fritidshus AS | Real estate | 1994 |
| Boutique Adelin Ans | Wholesale & retail | 1985 |
| Boutique De Nim AS | Wholesale & retail | 2003 |
| Bowl of Wood AS | Professional & scientific | 2025 |
| Box 4 AS | Real estate | 2025 |
| Box 5 AS | Real estate | 2025 |
| Brannummer 45 AS | Real estate | 2020 |
| Brave Forvaltning AS | Real estate | 2016 |
| Brave Gruppen AS | Real estate | 2002 |
| Braves AS | Professional & scientific | 2012 |
| Braves Global AS | Professional & scientific | 2016 |
| Breakroom AS | Health & social care | 2021 |
| Breivik Camping AS | Hospitality | 2017 |
| Brekka Sandtak AS | Mining & quarrying | 2002 |
| Brenneriet Mipco AS | Financial services | 2021 |
| Bricks & Walls AS | | 2024 |
| Bringsverd & Groos Da | Transport & logistics | 2017 |
| Bringsverd & Hesseldalen AS | Agriculture & fishing | 2023 |
| Bris.No AS | Hospitality | 2016 |
| Briseid Holding AS | | 2021 |
| Brisen Invest AS | | 2022 |
| Brixen AS | Real estate | 2016 |
| Broen AS | | 2021 |
| Bruktbil Forum/Elzabout | Wholesale & retail | 2013 |
| Brunåsen AS | Real estate | 2019 |
| BRV AS | Construction | 2019 |
| BRV Tilkomstteknikk AS | Manufacturing | 2026 |
| Brygga Losji AS | Real estate | 2004 |
| Bråstad AS | Financial services | 2008 |
| Bråstad BT1 S11 AS | Real estate | 2026 |
| Bråstad BT1 S12 AS | Real estate | 2026 |
| Bråstad BT1 S14 AS | Real estate | 2026 |
| Bråstad BT1 S22 AS | Real estate | 2026 |
| Bråstad BT1 S3 AS | Real estate | 2026 |
| Bråstad BT1 S4 AS | Real estate | 2026 |
| Bråstad BT1 S6 AS | Real estate | 2026 |
| Bråstad BT4 S1 AS | Real estate | 2026 |
| Bråstad BT4 S3 AS | Real estate | 2026 |
| Bråstad BT4 S4 AS | Real estate | 2026 |
| Bråstad BT4 S5 AS | Real estate | 2026 |
| Bråstad BT4 S6 AS | Real estate | 2026 |
| Bråstad BT4 S7 AS | Real estate | 2026 |
| Bråstad BT4 S8 AS | Real estate | 2026 |
| Bråstad BT4 S9 AS | Real estate | 2026 |
| Brødrene Brothers Ans | Real estate | 2007 |
| Brødrene Jakobsen AS | Construction | 2008 |
| Brødrene Rislå Tellefsen Ans | Agriculture & fishing | 1995 |
| BT Legetjenester AS | Health & social care | 2011 |
| Bull-Dog AS | Professional & scientific | 2025 |
| Bunnpris Grimstad AS | Wholesale & retail | 2010 |
| Bunor AS | Construction | 2020 |
| Bunor Eiendomsutvikling AS | Real estate | 2022 |
| Bunor Holding AS | Construction | 2020 |
| Bunor Maskin Utleie AS | Administrative & support | 2022 |
| Burrito Børsen AS | Hospitality | 2023 |
| Bygg & Hageservice AS | Construction | 2012 |
| Bygg Wari AS | Real estate | 2006 |
| Byggfirma Aleksander Aas AS | Construction | 2021 |
| Byggmester Bastian Amundsen AS | Construction | 2022 |
| Byggmester Terjesen Og Githmark AS | Construction | 2019 |
| Bygnes BT1 S10 AS | Real estate | 2025 |
| Bygnes BT2 S10 AS | Real estate | 2026 |
| Bygnes BT2 S19 AS | Real estate | 2026 |
| Bygnes BT2 S7 AS | Real estate | 2026 |
| Bådsenter Gruppen AS | Wholesale & retail | 2016 |
| Båt & Motor AS | | 2023 |
| Børuf Holding AS | | 2019 |
| C.Andersson AS | | 2021 |
| Cafe Java Ans | Information & communication | 1998 |