| 3T Team AS | Real estate | 2006 |
| A. Storm Holding AS | | 2019 |
| Aaby Eiendom AS | Real estate | 1982 |
| Aalerud AS | Information & communication | 2020 |
| Aasen Eiendomsutvikling AS | Real estate | 2005 |
| Admar Entreprenør AS | Construction | 2018 |
| Adventureworks AS | | 2016 |
| Ahlberg Data AS | Information & communication | 2006 |
| Ait Urbanism & Landscape Limited | Professional & scientific | 2021 |
| Apotek 1 Vøyenenga Senter AS | Wholesale & retail | 2024 |
| Arboscan AS | Professional & scientific | 2026 |
| Arctic Bike AS | Arts & recreation | 2022 |
| Arctic Circus AS | Information & communication | 2011 |
| Aromagruppen AS | Real estate | 2005 |
| Aromagården AS | Real estate | 2002 |
| Art Trading AS | Administrative & support | 2003 |
| Arvnes Holding AS | Professional & scientific | 1975 |
| AS Erling Johannessen | Manufacturing | 1962 |
| AS Hibas | Administrative & support | 1978 |
| AS Lisa | Manufacturing | 1976 |
| Asker & Bærum Vaktmesterkompani AS | Administrative & support | 2019 |
| Asker Og Bærum Grøntmiljø AS | Construction | 2021 |
| Astrakom AS | Construction | 1998 |
| Astrakom Holding AS | Construction | 2010 |
| Atelier Nomade AS | Professional & scientific | 2022 |
| Atoll Invest AS | Real estate | 2015 |
| Avantidesign AS | Professional & scientific | 1998 |
| Avea Gruppen AS | Administrative & support | 2023 |
| Avea Holding AS | Hospitality | 2021 |
| Backbone AS | Wholesale & retail | 2013 |
| Bangkok Burger Ltd Nuf | Hospitality | 2020 |
| Bare Bilutleie AS | Administrative & support | 2009 |
| Barneskatter Bærum AS | Wholesale & retail | 2021 |
| Baus AS | Wholesale & retail | 2015 |
| Berlevåg Fysioterapi AS | Health & social care | 2015 |
| Berner AS | Wholesale & retail | 1998 |
| Bjerke Dagligvare AS | Wholesale & retail | 2020 |
| Bjør AS | | 1991 |
| Blamont AS | | 2020 |
| Blommenholm Hageservice AS | Construction | 2023 |
| Board Governance AS | Professional & scientific | 2009 |
| Bos-Nor D.O.O. Nuf | Construction | 2022 |
| Brevig Holding AS | Information & communication | 2020 |
| Brightshift AS | Information & communication | 2025 |
| Brumyr AS | | 2026 |
| Bryhnilsen AS | Transport & logistics | 1985 |
| Burre AS | Real estate | 2008 |
| Butterfly Garden AS | Administrative & support | 2016 |
| Bygg Og Rehab AS | Construction | 2021 |
| Byggmester Haukur Hauksson AS | Real estate | 2017 |
| BYTE52 AS | Information & communication | 2018 |
| Båtstø Terrasse AS | Real estate | 2011 |
| Bærum Kennel AS | Agriculture & fishing | 1994 |
| Bærum Maskin Og Stillasutleie AS | Administrative & support | 2013 |
| Bærum Metallgjenvinning AS | Water & waste | 2024 |
| Bærum Taktekking & Blikkenslager AS | Construction | 2004 |
| C & E Kontorfellesskap AS | Real estate | 2021 |
| Came Norge Og Anderson Elektro AS | Construction | 2001 |
| Capitan Invest AS | | 2023 |
| Cardsome AS | Wholesale & retail | 2016 |
| Carola AS | Wholesale & retail | 1962 |
| Caspari Eiendom AS | Real estate | 2017 |
| CCK 2 AS | | 2026 |
| CCK 3 AS | | 2026 |
| CCK AS | Wholesale & retail | 2021 |
| Circle Technology AS | Information & communication | 2020 |
| Cirrusweb AS | | 2016 |
| CJ Jaren AS | | 2026 |
| Clean Ship AS | Wholesale & retail | 2021 |
| Color Da | Construction | 2011 |
| CS3 Holding AS | | 2021 |
| Culina AS | Wholesale & retail | 1998 |
| Culina Norge AS | Wholesale & retail | 2003 |
| Cycle Service Nordic AS | Wholesale & retail | 2011 |
| D&S Eiendom AS | Real estate | 2015 |
| D&S Økonomi Og Regnskap AS | Professional & scientific | 2016 |
| Dekk AS | Wholesale & retail | 1997 |
| Delta Ortopediske Senter | Health & social care | 2018 |
| Den Gyldne Bønne AS | Manufacturing | 1997 |
| Devlin Holding AS | | 2022 |
| Diesel-Teknikk AS | Professional & scientific | 2024 |
| Dinas Bygg Og Sanitær AS | Construction | 2012 |
| Dinas Holding AS | Professional & scientific | 2009 |
| Dine Røtter AS | Agriculture & fishing | 2018 |
| Dinerabatter AS | Wholesale & retail | 2024 |
| Direkteimport AS | Wholesale & retail | 2008 |
| Direktesalg AS | Wholesale & retail | 2026 |
| Duggfriskt AS | Manufacturing | 2016 |
| E.N Pro Bygg Team AS | Construction | 2026 |
| Econova AS | Professional & scientific | 2000 |
| Einøvlingseggen AS | Professional & scientific | 2024 |
| Eivind Dogger Holding AS | | 2024 |
| Eivind Myhre AS | Wholesale & retail | 2005 |
| El-Tilsynet AS | Professional & scientific | 1991 |
| Emara AS | | 2024 |
| Enablers Training & Consultancy AS | Professional & scientific | 2004 |
| Ene Byggruppen AS | Construction | 2023 |
| Engenes Holding AS | Construction | 2021 |
| Engenes Invest AS | | 2025 |
| Engetek AS | Construction | 2012 |