| 145 Holding AS | | 2025 |
| 365 Invest AS | | 2026 |
| A Stake AS | Transport & logistics | 1941 |
| Aamodt Eiendomsutvikling AS | Real estate | 2021 |
| Aamodt Holding AS | Real estate | 2005 |
| Aasberg Holding AS | Real estate | 2005 |
| Aaserud AS | | 2025 |
| Acra Invest AS | | 2023 |
| Adventure & Invest AS | Administrative & support | 2005 |
| Aia Holding AS | Construction | 2010 |
| Aircare AS | Professional & scientific | 2025 |
| Akart AS | Professional & scientific | 1984 |
| Akershus Utemiljø AS | Administrative & support | 2013 |
| All in All AS | Financial services | 2016 |
| Alt I Asfalt AS | Construction | 2010 |
| Alt I Asfalt Eiendom AS | Construction | 2010 |
| Aluko AS | Wholesale & retail | 1998 |
| Am Construction AS | Construction | 2021 |
| Am-Gruppen AS | Construction | 2019 |
| Amblie Og Moe Bygg AS | Construction | 2020 |
| Amforma AS | | 2026 |
| Andresen & Far AS | Construction | 1993 |
| Arctic Nest AS | Hospitality | 2025 |
| Arnold Bakke AS | Construction | 2018 |
| Art.D AS | Construction | 2018 |
| Artur Byggservice AS | Construction | 2020 |
| AS Gjerde- og Sikringsservice | Construction | 1987 |
| AS Norsk Mølleservice | Manufacturing | 1983 |
| AS Talio | Professional & scientific | 1986 |
| Asbjørn Olstad Holding AS | Real estate | 2010 |
| Asgs Holding AS | | 2022 |
| Ask Antikk Og Interiør Ans | Wholesale & retail | 2007 |
| Ask Boliger AS | Real estate | 2015 |
| Ask Brodal AS | Real estate | 2011 |
| Ask Dagligvare AS | Wholesale & retail | 2017 |
| Ask Industrimontasje AS | Transport & logistics | 1996 |
| Ask Mat AS | Wholesale & retail | 2022 |
| Ask Project Management AS | Professional & scientific | 2024 |
| Ask Sentrum Eiendom AS | Real estate | 2008 |
| Ask Tannhelse AS | Health & social care | 2022 |
| Askdammen Holding AS | | 2026 |
| Asktorvet 1 Eiendom AS | Real estate | 2012 |
| Asktorvet Holding AS | Real estate | 2015 |
| Asktunet Eiendom AS | Real estate | 2020 |
| Asmyrsvingen 1 Eiendom AS | Real estate | 2022 |
| Atelier Hinode AS | Professional & scientific | 2022 |
| Aub AS | Real estate | 2008 |
| Auto Industry Norway AS | Wholesale & retail | 2016 |
| Autoviva AS | Wholesale & retail | 2024 |
| Av Minilager AS | Transport & logistics | 2026 |
| Avanse Media Ans | Professional & scientific | 2024 |
| B&N Utvikling AS | Real estate | 2016 |
| Baderom Entreprenøren AS | Construction | 2023 |
| Bare Eb Invest AS | Financial services | 2007 |
| Barnas Dag AS | Arts & recreation | 2003 |
| Bauta Entreprenør AS | Construction | 2024 |
| Becker Marine Systems Norway AS | Wholesale & retail | 2009 |
| Bempus Digital AS | Professional & scientific | 2018 |
| Bent Gate Brewing AS | Manufacturing | 2021 |
| Bergstrandholding AS | | 2025 |
| Beston AS | Construction | 2006 |
| BF Landbruksservice Da | Agriculture & fishing | 2007 |
| BG Stillas AS | Administrative & support | 2014 |
| BG Stillas Utleie AS | Administrative & support | 2021 |
| Bilveglaget Renåtangen SA | Real estate | 2022 |
| Bio Health Norway AS | Wholesale & retail | 2015 |
| Bira AS | Wholesale & retail | 2013 |
| Bjørkely Prosjekt AS | Information & communication | 2020 |
| Bjørnstad Gjerdrum Invest AS | Financial services | 2015 |
| Blomsterlinna AS | Wholesale & retail | 2021 |
| Bogetvedt AS | Hospitality | 2006 |
| Bohemen Frisører AS | Other services | 2016 |
| Boplan Entreprenør AS | Construction | 1994 |
| Boplan Invest AS | Construction | 2015 |
| Borgaard Invest AS | Financial services | 2005 |
| Borgen Kapital AS | | 2019 |
| Bosman Oppussing AS | Construction | 2022 |
| Braate Consulting AS | Financial services | 2005 |
| Braate Eiendom AS | Real estate | 2003 |
| Braate Kjærstad AS | | 2023 |
| Brennmoen Holding AS | Professional & scientific | 1999 |
| Brobo Prosjekt AS | Real estate | 2018 |
| Broinvest Holding AS | Real estate | 2014 |
| Brus Norway AS | Construction | 2025 |
| Bryghaug Holding AS | Other services | 2021 |
| Brådal Golf AS | Arts & recreation | 2003 |
| Brådalsfjellet Utbygging AS | Real estate | 2019 |
| Bull Trans Eiendom AS | Transport & logistics | 2018 |
| Bull Trans Oslo AS | Transport & logistics | 1988 |
| Buvez Agenturer AS | Wholesale & retail | 2012 |
| Byggnor AS | Construction | 2021 |
| Byggservice Kwapis AS | Construction | 2017 |
| Capitana AS | Arts & recreation | 2014 |
| Cargo Trine Consulting AS | Professional & scientific | 2020 |
| Cato Johansen Holding AS | | 2023 |
| Cedell Frang Kristoffersen AS | Real estate | 1984 |
| Celli Nett AS | Wholesale & retail | 2020 |
| Cfa Rørleggerbedrift AS | Construction | 2011 |
| Christiania Cigar Club AS | Financial services | 1996 |
| Christoffer Olstad Holding AS | | 2024 |