| Buråsen Holding AS | Real estate | 2011 |
| Buråsen Syd AS | Real estate | 2007 |
| Burøy AS | Financial services | 2006 |
| Busch Butikkdrift AS | Wholesale & retail | 2026 |
| Busch Invest AS | | 2024 |
| Buschyo AS | Information & communication | 2015 |
| Busck Ink AS | Financial services | 2016 |
| Buset Kraft AS | Energy | 2023 |
| Buseth & Lidal AS | Hospitality | 1987 |
| Bushra Bygg Og Maling AS | Construction | 2025 |
| Busi Company AS | Wholesale & retail | 2024 |
| Business Concentric Group AS | Real estate | 1998 |
| Business Da | Information & communication | 2011 |
| Business Development AS | Professional & scientific | 2019 |
| Business Development Group AS | Education | 2000 |
| Business Expense AS | Professional & scientific | 2015 |
| Business for Transport AS | Transport & logistics | 2024 |
| Business Graphics AS | Professional & scientific | 2025 |
| Business Impact Ans | Education | 2001 |
| Business Intelligence AS | Professional & scientific | 1994 |
| Business Intelligence AS | Information & communication | 2003 |
| Business Intelligence Partner AS | Professional & scientific | 2003 |
| Business Intelligence Scandinavia AS | Professional & scientific | 2019 |
| Business IT AS | Information & communication | 2015 |
| Business Sweden Business Support Office Norway Nuf | Professional & scientific | 2019 |
| Business Village AS | Real estate | 2005 |
| Business Women Oslo Ans | Education | 2018 |
| Businessmanden AS | | 2021 |
| Businessmastering AS | Professional & scientific | 2005 |
| Businesspartner AS | Professional & scientific | 1989 |
| Buskerud Dagligvare AS | Real estate | 2016 |
| Buskerud Øyeklinikk AS | Health & social care | 2004 |
| Buskerudveien Eiendomsinvest AS | Real estate | 2016 |
| Buss Port Logistics GmbH & Co. KG | Transport & logistics | 2014 |
| Buss På Tur AS | Transport & logistics | 2022 |
| Bussanlegg Kloppaveien 16 AS | Real estate | 2003 |
| Bussanlegg Kloppaveien 18 AS | Real estate | 2006 |
| Bussanlegg Årnes AS | Real estate | 2024 |
| Busse AS | Professional & scientific | 2020 |
| Bussimport AS | Wholesale & retail | 2025 |
| Bussin AS | Professional & scientific | 2025 |
| Bussterminal Kolonial AS | Wholesale & retail | 2021 |
| Bustadir AS | Transport & logistics | 1998 |
| Bustbyte AS | Information & communication | 2016 |
| Busterboy AS | Other services | 2015 |
| Busterud Holding AS | | 2023 |
| Bustnes Energi AS | Professional & scientific | 2021 |
| Bustrand Invest AS | Real estate | 1986 |
| Bustulen AS | | 2022 |
| Busy Bee Rentals AS | Real estate | 2020 |
| Busy Sunday No AS | Information & communication | 2026 |
| Busy Technologies AS | Information & communication | 2021 |
| Butenschön & Scholz AS | Professional & scientific | 2023 |
| Butenschøn Boye AS | | 2019 |
| Butikk Bølla Og Soulat Veiservice AS | Wholesale & retail | 2018 |
| Butikk Houjin AS | Wholesale & retail | 2022 |
| Butikk NR. 7 Universitetsgaten Nebell Og Borknes Ans | Wholesale & retail | 2007 |
| Butikk Peusa AS | Wholesale & retail | 2022 |
| Butikk Solsaev AS | Wholesale & retail | 2019 |
| Butikk TRV Eiendom AS | Real estate | 2021 |
| Butikkdrift Afshar AS | Wholesale & retail | 2022 |
| Butikkdrift Afzali AS | Wholesale & retail | 2024 |
| Butikkdrift Ali AS | Wholesale & retail | 2026 |
| Butikkdrift Anita Christiansen AS | Wholesale & retail | 2022 |
| Butikkdrift Asmith AS | Wholesale & retail | 2025 |
| Butikkdrift Assad AS | Wholesale & retail | 2014 |
| Butikkdrift Bia AS | Wholesale & retail | 2026 |
| Butikkdrift Enes Køkyer AS | Wholesale & retail | 2021 |
| Butikkdrift H. Qadiri AS | Wholesale & retail | 2023 |
| Butikkdrift Heidelberg AS | Wholesale & retail | 2025 |
| Butikkdrift Hou AS | Wholesale & retail | 2024 |
| Butikkdrift Hussain AS | Wholesale & retail | 2026 |
| Butikkdrift Ilyas AS | Wholesale & retail | 2024 |
| Butikkdrift Irfan AS | Wholesale & retail | 2025 |
| Butikkdrift Jowang AS | Wholesale & retail | 2014 |
| Butikkdrift Love Jimo AS | Wholesale & retail | 2024 |
| Butikkdrift Mehrnosh Shokri AS | Wholesale & retail | 2024 |
| Butikkdrift Mohid AS | Wholesale & retail | 2026 |
| Butikkdrift Nas AS | Wholesale & retail | 2021 |
| Butikkdrift NDQ AS | Wholesale & retail | 2023 |
| Butikkdrift Nemati AS | Wholesale & retail | 2025 |
| Butikkdrift Ochagberg AS | Wholesale & retail | 2024 |
| Butikkdrift Ole Martin Jørgensen AS | Wholesale & retail | 2020 |
| Butikkdrift Peroti AS | Wholesale & retail | 2021 |
| Butikkdrift Rafif Al-Sed Yasein AS | Wholesale & retail | 2025 |
| Butikkdrift RCN AS | Wholesale & retail | 2015 |
| Butikkdrift Ruban AS | Wholesale & retail | 2022 |
| Butikkdrift Sandakerveien 24 AS | Wholesale & retail | 2007 |
| Butikkdrift Serrano Ocampo AS | Wholesale & retail | 2022 |
| Butikkdrift Sjølie AS | Wholesale & retail | 2024 |
| Butikkdrift Walton AS | Wholesale & retail | 2020 |
| Butikkdrift Zunaira Amir AS | Wholesale & retail | 2020 |
| Butikkdrift Øyvind Thorsell AS | Wholesale & retail | 2011 |
| Butikknuten AS | Wholesale & retail | 2003 |
| Butikkprosjekt AS | Construction | 2020 |
| Butikksystemer AS | Financial services | 1985 |
| Butleren Catering AS | Hospitality | 2005 |
| Butter Boy Tech AS | Information & communication | 2026 |
| Butter Eye Pictures AS | Information & communication | 2023 |
| Butterfly AS | | 2021 |