| Apex Bergen AS | Bergen | 2025 |
| Apex Capital AS | Oslo | 2015 |
| Apex Consulting Advisors AS | Sørum | 2021 |
| Apex Digital AS | Oslo | 2025 |
| Apex Engineering AS | Sarpsborg | 2023 |
| Apex Group AS | Rørvik | 2026 |
| Apex Norge AS | Barkåker | 2023 |
| Apex Regnskap AS | Fornebu | 2022 |
| Apex Shield AS | Oslo | 2022 |
| Apex Solution AS | Drammen | 2024 |
| Apex Studio AS | Bergen | 2026 |
| Apex Venture AS | Oslo | 2023 |
| Apex Økonomi AS | Bergen | 2026 |
| Apexstride Holding AS | Mo I Rana | 2024 |
| Api 28 Ltd Nuf | N146Qh, London, Southgate | 2010 |
| Apices AS | Nordfjordeid | 2020 |
| Apiri AS | Ålesund | 2017 |
| Apis AS | Fjellstrand | 2018 |
| Apl Group AS | Gjøvik | 2022 |
| Aplitec | Fr-75014 Paris | 2022 |
| Aplittforedling AS | Namsskogan | 2001 |
| Apload AS | Oslo | 2021 |
| Aplos AS | Oslo | 2021 |
| Aply AS | Drammen | 2023 |
| Apneseth Rådgivning AS | Skien | 2015 |
| Apo-Nor AS | Bodø | 2010 |
| Apoiesis AS | Bergen | 2021 |
| Apoint AS | Kristiansund N | 2006 |
| Apoio Holding AS | Ålesund | 2016 |
| Apollo Energy Venture AS | Trondheim | 1992 |
| Apollo Holding AS | Oslo | 2009 |
| Apollo Markets AS | Oslo | 2009 |
| Apollo Norge Ans | Oslo | 1996 |
| Apollo X AS | Stavanger | 2022 |
| Apollon Rådgivning AS | Kvanne | 2023 |
| Apollos AS | Kristiansand S | 2002 |
| Apollø AS | Lysaker | 2023 |
| Aporto AS | Oslo | 2009 |
| Apostrofen AS | Aukra | 2021 |
| Apotrox Aquaculture AS | Bodø | 2024 |
| Apov AS | Oslo | 2026 |
| App Accounting AS | Askim | 2024 |
| App Start-Up Aktiebolag Nuf | Oslo | 2017 |
| Apparatus AS | Grimstad | 2016 |
| Apparatus Group AS | Grimstad | 2021 |
| Apparo Engineering Ltd | Ab33 8Nn Aberdeenshire | 2010 |
| Appcount AS | Bjerkreim | 2008 |
| Appell Consult AS | Drammen | 2026 |
| Appell Reklamebyrå AS | Drammen | 1999 |
| Appkon AS | Asker | 2022 |
| Applaus Creative AS | Trondheim | 2026 |
| Apple Pie AS | Nesbru | 2016 |
| Applica Norway AS | Oslo | 2018 |
| Applica Test & Certification AS | Mandal | 2003 |
| Application Consulting AS | Ålesund | 2025 |
| Applied Carbon Utilisation & Storage AS | Sandnes | 2020 |
| Applied Cost Cut AS | Froland | 1999 |
| Applied Geo Consultants Ltd Nuf | Tw9 2Jx Richmond | 2011 |
| Applied Hydrogen AS | Kongsberg | 2020 |
| Applied Petroleum Technology AS | Oslo | 2012 |
| Applied Petrophysics Ltd Nuf | Ab30Iff Aberdeenshire | 2022 |
| Applus Norway AS | Kongsberg | 1993 |
| Applus RTD UK Limited | Stirlingshire Fk3 8Ye | 2010 |
| Apply Consultants Limited | Sandnes | 1995 |
| Apply Poland | Pl-30-705 Krakow | 2015 |
| Applyequip Nuf | Stavanger | 2022 |
| Appodizer AS | Søreidgrend | 2016 |
| Approved AS | Oslo | 2011 |
| Apptrra Global AS | Stavanger | 2015 |
| Apptura AS | Kleppstad | 2014 |
| Apr AS | Søgne | 2022 |
| Aprego AS | Drammen | 2023 |
| Aprendo AS | Tiller | 2024 |
| Apri AS | Tynset | 2025 |
| Apri Trondheim AS | Trondheim | 2026 |
| Apriil AS | Bergen | 2023 |
| Apriil Brunch Holding AS | Bergen | 2024 |
| Apriil Digital AS | Bergen | 1992 |
| Apriil Digital V AS | Bergen | 2015 |
| Apriil Media AS | Bergen | 2014 |
| Apriil MVH AS | Oslo | 2007 |
| Apriil PR AS | Bergen | 1999 |
| Apriil Reklame AS | Bergen | 1999 |
| April Arkitekter AS | Oslo | 1945 |
| April AS | Asker | 2019 |
| Aprimo Rådgivning Frode Semb AS | Sandvika | 2008 |
| Aprimo Rådgivning Jakob Digranes AS | Sandvika | 2022 |
| Aprimo Rådgivning Martin Jensen AS | Kolbotn | 2022 |
| Aprimo Rådgivning Roar Buskoven AS | Billingstad | 2021 |
| Aprimo Rådgivning Roger Øqvist AS | Oslo | 2019 |
| Aprimo Rådgivning Tor Hernæs AS | Sandvika | 2008 |
| Aprimo Rådgivning Tore Soltveit AS | Stavanger | 2024 |
| Aprimo Rådgivning Vegard Øye AS | Oslo | 2025 |
| Aprimo Rådgivning Yngve Kaldestad AS | Klavestadhaugen | 2006 |
| Aproject AS | Oslo | 2019 |
| Apropo Regnskap AS | Skedsmokorset | 1975 |
| Apropos AS | Oslo | 2021 |
| Apropos Skatt Og Finans AS | Trondheim | 2005 |
| Aprosess AS | Snarøya | 2005 |
| Aprova AS | Arendal | 2010 |