| Allnex Norway AS | Manufacturing | 2012 |
| Allora Italiensk Pizzaria AS | Manufacturing | 2024 |
| Alna Rør AS | Construction | 2021 |
| Alvi Akershus AS | Real estate | 2014 |
| Alvi Halden AS | Real estate | 2016 |
| Alvi Holding AS | Professional & scientific | 2022 |
| Alvi Invest AS | Real estate | 2008 |
| Alvi Moss AS | Real estate | 2016 |
| Alvins AS | Real estate | 2013 |
| Am Bygg & Interiør AS | Construction | 2017 |
| Amalie Jensen AS | | 2023 |
| Ambrosia AS | Real estate | 1974 |
| Amedia Annonse Romerike Og Innlandet AS | Professional & scientific | 2022 |
| Amfibi Da | Wholesale & retail | 2004 |
| Amfja Holding AS | | 2018 |
| Amira AS | Real estate | 2020 |
| Amira Regnskap AS | Professional & scientific | 2024 |
| Ampm AS | Real estate | 2013 |
| Amtmand Bloms Gate 4 AS | Real estate | 2016 |
| Andero Holding AS | | 2024 |
| Anders Olaussen AS | Real estate | 2010 |
| Andøy Invest AS | Real estate | 2019 |
| Angi's Collection Da | Wholesale & retail | 2006 |
| Anita Engebråten Agenturer AS | Wholesale & retail | 2016 |
| Anita Østnes AS | Other services | 2017 |
| Anleggsgartner Eksperten AS | Construction | 2023 |
| Anna Johnson AS | Wholesale & retail | 2017 |
| Anne Panne AS | | 2024 |
| Anntre AS | Information & communication | 2023 |
| Anovia AS | | 2023 |
| Anteversio AS | Health & social care | 2011 |
| Anthony Sandberg AS | Wholesale & retail | 1965 |
| Antonio Nusa Holding AS | | 2025 |
| Apotek Meierikvartalet AS | Wholesale & retail | 2022 |
| Appelqvist Holding AS | | 2026 |
| Appera AS | Information & communication | 2023 |
| Aqfoten AS | Hospitality | 2022 |
| Arcelormittal Building Solutions Norge AS | Wholesale & retail | 1996 |
| Areal & Bolig Utvikling AS | Real estate | 1992 |
| Arena Trening AS | Arts & recreation | 2006 |
| Artur AS | Construction | 2022 |
| Arupsgate 2 Holding AS | Real estate | 2023 |
| Arupsgate 2 Næring AS | Real estate | 2023 |
| Arv Invest AS | | 2017 |
| AS Aktiv Interest | Real estate | 1990 |
| AS Gabrielsen & Sønner | Real estate | 1976 |
| AS Høyres Hus Lillestrøm | Other services | 1968 |
| AS Jonas Lies Gate 40 | Real estate | 1987 |
| AS Løvenstad Fyrings- Og Servicesentral | Energy | 1967 |
| AS Nittedalsgaten 12 | Real estate | 1984 |
| AS Valer Bygg AS | Construction | 2025 |
| Asapark AS | Information & communication | 2025 |
| Ase Invest AS | Information & communication | 2005 |
| Asian Dinner AS | Hospitality | 2022 |
| Askeladd Eiendom AS | Real estate | 2019 |
| Askheim Næringseiendom AS | Real estate | 2021 |
| Askmann Invest AS | Hospitality | 2019 |
| Aslak Bolts Gate 40 AS | Real estate | 2004 |
| Asma Selskap AS | Wholesale & retail | 2021 |
| Asmussen & Holmelund Aps | Construction | 2004 |
| Aso 391 Holding AS | | 2023 |
| Aspekt 79 AS | | 2026 |
| Assessica AS | Information & communication | 2024 |
| Astorh AS | | 2020 |
| Astralis Equitas AS | Wholesale & retail | 2024 |
| Athletech AS | Information & communication | 2024 |
| Atle Gulbrandsen Holding AS | | 2025 |
| Atom Økonomi Service AS | Professional & scientific | 1997 |
| Atp Invest AS | | 2019 |
| Attentus Verdi AS | Professional & scientific | 2001 |
| Aure & Valskaar AS | Real estate | 1998 |
| Automotors AS | Wholesale & retail | 2021 |
| Autoproff Norge AS | Wholesale & retail | 2021 |
| Autorola AS | Wholesale & retail | 2015 |
| Autoslo AS | Wholesale & retail | 2018 |
| Autoteam Trafikkskole AS | Education | 1986 |
| Autovi AS | Wholesale & retail | 2026 |
| Averio AS | Professional & scientific | 2026 |
| Aviationplus Norway AS | Transport & logistics | 2014 |
| Avicenna Klinikk AS | Health & social care | 2017 |
| Avklart AS | Professional & scientific | 2023 |
| Aziz Coinvest AS | | 2026 |
| Aziz Invest AS | Real estate | 2007 |
| B&G Foods AS | Hospitality | 2022 |
| B/B Holding AS | | 2026 |
| Baas Component AS | Manufacturing | 1986 |
| BACK2BACK Invest AS | Construction | 2021 |
| Badmash AS | Hospitality | 2022 |
| Bahez Transport AS | Transport & logistics | 2024 |
| Balder Solutions AS | Information & communication | 2018 |
| Barbers & Friends AS | Other services | 2021 |
| Barbershopbk AS | Other services | 2023 |
| Barmed AS | Health & social care | 2008 |
| Barnas Festdager SA | Arts & recreation | 2024 |
| Barnehagetomt AS | | 2016 |
| Barradas AS | Information & communication | 2018 |
| Barselgaven AS | Wholesale & retail | 2025 |
| Bath 2BE AS | Construction | 2025 |
| Bbl-Nabo AS | Real estate | 2023 |
| Bbreeder AS | Professional & scientific | 2016 |