| Argentum Business Management AS | Bergen | 2018 |
| Argentum Eis AS | Bergen | 2018 |
| Argentum Fondsinvesteringer AS | Bergen | 2001 |
| Argentum General Partner a AS | Bergen | 2021 |
| Argentum Invest Xix AS | Bergen | 2022 |
| Argentum Investment Partner AS | Bergen | 2008 |
| Argentum Nordic Pep 1 AS | Bergen | 2008 |
| Argentum Nordic Pep HC AS | Bergen | 2008 |
| Argentum Npep AS | Bergen | 2011 |
| Argentum Oppstart 1 AS | Bergen | 2021 |
| Argentum Primary AS | Bergen | 2019 |
| Argentum Private Equity AS | Bergen | 2000 |
| Argentum Secondary 2018A AS | Bergen | 2018 |
| Argentum Secondary 2018B AS | Bergen | 2018 |
| Argentum Secondary 2019 AS | Bergen | 2019 |
| Argentum Secondary AS | Bergen | 2008 |
| Argentum Secondary IV AS | Bergen | 2020 |
| Argentum Secondary Opportunity 2023 AS | Bergen | 2022 |
| Argentum Secondary Opportunity II AS | Bergen | 2024 |
| Argentum Secondary Opportunity IV AS | Bergen | 2026 |
| Argentum XV GP AS | Bergen | 2021 |
| Argod AS | Trondheim | 2005 |
| Arguin AS | Hønefoss | 2005 |
| Ariadne Invest AS | Oslo | 2005 |
| Arieb AS | Lommedalen | 2016 |
| Aries Holding AS | Trondheim | 2016 |
| Arild Bergmann Holding AS | Charlottenlund | 2005 |
| Arild Heskestad Invest AS | Søreidgrend | 2005 |
| Arild Holding AS | Solbergelva | 2005 |
| Arild Johansen Holding AS | Oslo | 2016 |
| Arild Rødal AS | Ålesund | 2007 |
| Arild Vikan Holding AS | Heimdal | 2007 |
| Arisona Holding AS | Oslo | 2007 |
| Aritho Invest AS | Søgne | 2005 |
| Arje Holding AS | Heimdal | 2013 |
| Ark Royal AS | Skien | 2002 |
| Arki Invest AS | Kokstad | 2005 |
| Arkitektbedriftene Forsikringsservice AS | Oslo | 2005 |
| Arkitektur AS | Kristiansand S | 2005 |
| Arko Bjørn AS | Bøverbru | 2018 |
| Arko Eivind AS | Bøverbru | 2018 |
| Arkson AS | Moi | 2003 |
| Arktiq Assuranse AS | Kirkenes | 2008 |
| Arktis Nordic Holding AS | Oslo | 2007 |
| Arkwright Investco 1 AS | Oslo | 2022 |
| Arkwright X Incubator Invest 10 AS | Oslo | 2019 |
| Arkwright X Incubator Invest 11 AS | Oslo | 2020 |
| Arkwright X Invest AS | Oslo | 2021 |
| Arkwright X Management AS | Oslo | 2020 |
| Arkwright X Partners Invest 1 AS | Oslo | 2020 |
| Arkwright X Partners Invest 2 AS | Oslo | 2024 |
| Arkwrightx Incubator Invest 2 AS | Oslo | 2017 |
| Arkwrightx Incubator Invest 3 AS | Oslo | 2017 |
| Arkwrightx Incubator Invest 5 AS | Oslo | 2018 |
| Arkwrightx Incubator Invest 7 AS | Oslo | 2018 |
| Arkwrightx Incubator Invest 8 AS | Oslo | 2018 |
| Arland AS | Bryne | 1996 |
| Arle Invest AS | Oslo | 2006 |
| Arleb Holding AS | Sparbu | 2017 |
| Arlis AS | Sandnes | 2018 |
| Arlø AS | Trondheim | 2005 |
| Arm Invest AS | Mandal | 2013 |
| Arma AS | Stryn | 2005 |
| Armand Holding AS | Oppegård | 2016 |
| Armentum AS | Lillehammer | 2017 |
| Armor AS | Oslo | 2018 |
| Arn Vennatrø Holding AS | Stjørdal | 2015 |
| Arna Og Åsane Holding AS | Bergen | 2002 |
| Arne Aniksdal Holding AS | Kongshavn | 2012 |
| Arne C. Ellingsen Invest AS | Sortland | 2005 |
| Arne Dyrdal Holding AS | Kleppestø | 2005 |
| Arne Glæstad Holding AS | Angvik | 2005 |
| Arne Holding AS | Godvik | 2005 |
| Arne Invest AS | Sandane | 2016 |
| Arne Pettersen Invest AS | Nyborg | 2009 |
| Arne Sandøy Invest AS | Molde | 2005 |
| Arne Syltern Invest AS | Åfjord | 2005 |
| Arned Holding AS | Nesttun | 2005 |
| Arnegard Holding AS | Ål | 2005 |
| Arnesin AS | Ørsta | 2013 |
| Arnfinn Bakken AS | Os I Østerdalen | 2017 |
| Arnin AS | Trondheim | 2012 |
| Arnstad Holding AS | Oslo | 2018 |
| Arnstad Invest AS | Halden | 2005 |
| Arnstein J. Syltern Invest AS | Trondheim | 2011 |
| Arnt Hagen Holding AS | Hunndalen | 2005 |
| Arnt Invest AS | Bøverbru | 2005 |
| Arnte Holding AS | Røros | 2017 |
| Arntzberg Holding AS | Sandnessjøen | 2017 |
| Arnulf Bendixen Invest AS | Bodø | 2005 |
| Arom Invest AS | Oslo | 2007 |
| Aron Capital AS | Oslo | 2007 |
| Arost AS | Klepp Stasjon | 2017 |
| Arpu Holding AS | Oslo | 2017 |
| Arra Holding AS | Ottestad | 2015 |
| Arret AS | Oslo | 2010 |
| Arrl Invest AS | Oslo | 2016 |
| Arstad AS | Jevnaker | 2015 |
| Art & Fun Norge AS | Hønefoss | 2005 |
| Art Advice AS | Lysaker | 1998 |