| Billagring for Alle AS | Wholesale & retail | 2022 |
| Billigkro AS | Wholesale & retail | 2024 |
| Billingstad Barnehage SA | Education | 1994 |
| Billingstad Eiendomsinvest Holding AS | Real estate | 2025 |
| Billingstad Møbel Og Interiør AS | Wholesale & retail | 2025 |
| Billingstad Trelast AS | Wholesale & retail | 1986 |
| Billingstadsletta 13 AS | Real estate | 2001 |
| Billingstadsletta 14-18 AS | Real estate | 1983 |
| Billingstadsletta 17 AS | Real estate | 2009 |
| Billingstadsletta 19 AS | Real estate | 2016 |
| Billingstadsletta 22 AS | Real estate | 2005 |
| Billingstadsletta 23 AS | Real estate | 2001 |
| Billingstadsletta 24 AS | Real estate | 2005 |
| Billingstadsletta 26 AS | Real estate | 2009 |
| Billingstadsletta 35 AS | Real estate | 1992 |
| Bilnext AS | Wholesale & retail | 2024 |
| Biri AS | Manufacturing | 2004 |
| Bjag AS | Real estate | 2003 |
| Bjarne Eia & Co AS | | 2005 |
| Bjørnerud Holding AS | Real estate | 2005 |
| Blue Chinos Holding AS | | 2026 |
| Blue Line Invest AS | Financial services | 2017 |
| Blue Square AS | Professional & scientific | 2019 |
| BMT AS | Wholesale & retail | 2016 |
| Boligkontrollen AS | Information & communication | 2026 |
| Bottleneck Consulting AS | Professional & scientific | 2022 |
| Boye AS | Wholesale & retail | 2012 |
| Brafas AS | Construction | 2014 |
| Brani Produksjon AS | Real estate | 2001 |
| BRC Eiendom AS | Real estate | 2023 |
| Bridgeto AS | Wholesale & retail | 2023 |
| Brokelandsheia Areal AS | | 2025 |
| Brugata Bolig AS | Real estate | 2022 |
| Bryllupslisten AS | Wholesale & retail | 2023 |
| Bugten AS | Real estate | 2005 |
| Bus AS | Information & communication | 2014 |
| Businesspeople Bemanning Og Rekruttering AS | Administrative & support | 1989 |
| Bygdinvegen 1 AS | Real estate | 2018 |
| Bygg Og Prosjektutvikling AS | Real estate | 1987 |
| Byggfront AS | Construction | 2022 |
| Bymedhus AS | Wholesale & retail | 2017 |
| Byporten Jessheim Bygg Sør AS | Real estate | 2019 |
| Byråservice AS | Professional & scientific | 1983 |
| Båt Og Heis AS | Wholesale & retail | 2021 |
| Båthuset Slependen AS | Wholesale & retail | 2001 |
| Bærum Betong AS | Construction | 2024 |
| Bærum HR & Rekruttering AS | Administrative & support | 2024 |
| Bølingshavn Senter AS | Real estate | 1996 |
| Caba Holding AS | | 2011 |
| Cabo Consulting AS | Professional & scientific | 2019 |
| Camina City AS | Administrative & support | 2025 |
| Camp Scandinavia AB | Wholesale & retail | 1999 |
| Camp Scandinavia AS | Wholesale & retail | 1990 |
| CAP10 AS | Information & communication | 2012 |
| Capex Invest AS | Real estate | 2023 |
| Capillus AS | Other services | 2025 |
| Capillus Capital AS | Other services | 2025 |
| Capital Eiendom AS | Real estate | 2022 |
| Caprio Import AS | Wholesale & retail | 2022 |
| Caprio Invest AS | | 2022 |
| Captive AS | Information & communication | 1999 |
| Carlings AS | Wholesale & retail | 1999 |
| Catmandoo AS | Hospitality | 2020 |
| Cbra AS | Health & social care | 2006 |
| Ceion AS | Professional & scientific | 2024 |
| Cejoys Nuf | Information & communication | 2010 |
| Celebrate AS | Wholesale & retail | 2025 |
| Choconorway AS | Wholesale & retail | 2026 |
| Choice Eiendom AS | Real estate | 2001 |
| Choice Living AS | Real estate | 2011 |
| Cibes Lift Norge AS | Construction | 2014 |
| Cito Eiendom AS | Real estate | 2017 |
| Clean Innovation AS | Wholesale & retail | 2019 |
| Clynker AS | Information & communication | 2021 |
| Cmdk AS | Professional & scientific | 2024 |
| Cmy Invest AS | | 2019 |
| Cni AS | Health & social care | 2017 |
| Coherent AS | Information & communication | 2016 |
| Commedia AS | Professional & scientific | 1998 |
| Compagnie Jacobsen Kolsås Ans | | 1994 |
| Concentio AS | Education | 1998 |
| Conceptor AS | Real estate | 1995 |
| Conceptor Bolig AS | Real estate | 2016 |
| Conceptor Eiendom AS | Real estate | 1998 |
| Conceptor Forvaltning AS | Professional & scientific | 2007 |
| Conceptor Invest AS | Real estate | 2017 |
| Concilia Retail Property AS | Real estate | 2012 |
| Considium Consulting Group AS | Professional & scientific | 1986 |
| Convarig AS | Real estate | 2005 |
| Cosma Holding AS | | 2024 |
| Costa Eiendom AS | Real estate | 1997 |
| Covent Garden AS | Professional & scientific | 1998 |
| CSW Holding AS | | 2025 |
| Cubus AS | Wholesale & retail | 1986 |
| Cultivate Food AS | Hospitality | 2018 |
| Dag-Ny AS | Real estate | 1984 |
| Dagslet Holding AS | | 2024 |
| Dalaveien AS | Wholesale & retail | 2006 |
| Danebuåsen AS | Real estate | 2009 |
| Dansac and Hollister Scandinavia Inc Nuf | Wholesale & retail | 1995 |