| Aksnes Lyd Og Musikk Da | Verdal | 2018 |
| Aktieselskapet Ullevaal Stadion | Oslo | 1925 |
| Aktiv Arrangement AS | Trondheim | 2012 |
| Aktiv Bane Drift AS | Gol | 2017 |
| Aktiv Bedriftsservice AS | Solbergelva | 2009 |
| Aktiv Begeistring AS | Oslo | 2006 |
| Aktiv Bemanning Norge AS | Kongsvinger | 2008 |
| Aktiv Brolægning Mosbjerg Aps | Dk-9870 Sindal | 2012 |
| Aktiv Eiendomsdrift AS | Harestua | 2006 |
| Aktiv I Lom AS | Lom | 2017 |
| Aktiv I Nord AS | Saltnes | 2005 |
| Aktiv Kapitalinvest AS | Ski | 2006 |
| Aktiv Omsorg Vest AS | Bergen | 2017 |
| Aktiv Oppgjør AS | Bergen | 2004 |
| Aktiv Renhold AS | Grimstad | 2024 |
| Aktiv Renhold Og Oppussing Da | Oslo | 2007 |
| Aktiv Service & Montasje AS | Kristiansand S | 2016 |
| Aktiv Service Utleie AS | Oslo | 2015 |
| Aktiv Skadedyr Og Miljø AS | Tromsø | 2023 |
| Aktiv Ukh AS | Østre Gausdal | 2022 |
| Aktiv Utleiepartner AS | Trondheim | 2006 |
| Aktiv Vaktmesterdrift AS | Oslo | 2022 |
| Aktiv Ventilasjon AS | Råde | 2016 |
| Aktiv-Partner AS | Kvaløya | 2008 |
| Aktive Fredsreiser Travel for Peace AS | Risør | 2002 |
| Aktive-Renholdstjenester AS | Oslo | 2023 |
| Aktivgruppen AS | Trondheim | 2010 |
| Aktivitet Norge AS | Oslo | 2019 |
| Aktivitet Service Issue Assist AS | Nedre Eggedal | 2026 |
| Aktivitets Utleie AS | Haslum | 2024 |
| Aktivpersonale Nuf | Dk-7500 Holstebro | 2014 |
| Aktivt Renhold AS | Sandvika | 1994 |
| Aktivut AB Nuf | 84594 Hackås | 2014 |
| Aktor AS | Oslo | 1985 |
| Akutt Utleie AS | Oslo | 2001 |
| Akvedlikehold AS | Oslo | 2025 |
| Al Bayt Hajj Services AS | Oslo | 2012 |
| Al Capone AS | Fredrikstad | 2008 |
| Al Drift AS | Forsøl | 2020 |
| Al Service AS | Sandøy | 2017 |
| Al Utleieservice AS | Eydehavn | 2024 |
| Al-Baraka for Hajj Og Umrah AS | Sørum | 2017 |
| Alakara AS | Sand | 2018 |
| Alandia Engineering Estonia Oü Nuf | 75306 Harjumaa | 2018 |
| Alandia Engineering Marine Nuf | Fi-22100 Mariehamn, Åland | 2025 |
| Alara AS | Oslo | 2026 |
| Alarm Og Sikkerhetsprodukter Ans | Oslo | 1990 |
| Alarm Systemer AS | Kragerø | 1979 |
| ALARM24 AS | Bø I Vesterålen | 2014 |
| Alarmconsult AS | Hellesøy | 2005 |
| Alarmeksperten AS | Rognan | 2013 |
| Alaturka AS | Trondheim | 2013 |
| Alazzi AS | Hagan | 2016 |
| Alb Maskin AS | Dombås | 2026 |
| Alb Renhold AS | Oslo | 2025 |
| Alba Consulting Norway | Lb-06952391 Koura | 2018 |
| Alba Og Finito AS | Oslo | 2023 |
| Albaniaguiden AS | Oslo | 2022 |
| Albatros Travel Nuf | Dk-1752 København V | 2006 |
| Albatross II AS | Oslo | 2004 |
| Albert & Værnes Smart Service AS | Trondheim | 2025 |
| Albertine AS | Asker | 1974 |
| Albesi Holding AS | Førresfjorden | 2016 |
| Albinbussen Ans | Rognan | 1981 |
| Alc Aircraft Limited Nuf | Ie-D02 E277 Dublin | 2021 |
| Alc AS | Horten | 2024 |
| Alc Holding AS | Lysaker | 2018 |
| Alcam AS | Oslo | 1993 |
| Alcatel-Lucent Espana | Fornebu | 2016 |
| Alcoa Fjardaal S.F. | Is-731 Reydarfjordur | 2024 |
| Alcoa USA Corp. | Pittsburgh Pa 15212-5858 | 2019 |
| Aldri Alene AS | Gjøvik | 2020 |
| Alegro AS | Hokksund | 2017 |
| Aleksandra Invest AS | Oslo | 1990 |
| Alektum Group AB | Se-417 64 Göteborg | 2020 |
| Aleris Recycling GmbH (German Works) | Eidsvåg I Romsdal | 2010 |
| Alessa AS | Kvalsund | 2025 |
| Alexander Chavanne AS | Kabelvåg | 2020 |
| Alexander Hermansen AS | Skjærhalden | 2018 |
| Alexander Mann Solutions AS | Sandnes | 2013 |
| Alexandra Kontor Og Service AS | Årnes | 2009 |
| Alexpedition AS | Vettre | 2018 |
| Alf Ståle Flo AS | Stryn | 2005 |
| Alfa & Omega Eiendom AS | Hagan | 1995 |
| Alfa Anlegg & Utleie AS | Krokstadelva | 2025 |
| Alfa Drift AS | Kristiansand S | 2015 |
| Alfa Eiendomsservice AS | Molde | 2007 |
| Alfa Fasade AS | Oslo | 2020 |
| Alfa Fasadevask Telemark AS | Skien | 2022 |
| Alfa GmbH | De-72644 Oberboihingen | 2026 |
| Alfa International | De 72622 Nûrtingen | 2020 |
| Alfa Invest Norway AS | Heimdal | 2013 |
| Alfa Kollega AS | Slependen | 2011 |
| Alfa Pi SA | Gr-19004 Spata Attica | 2017 |
| Alfa Safe AS | Bryne | 2020 |
| Alfa Skadedyrkontroll AS | Hommersåk | 2020 |
| Alfred Cheyne Engineering Ltd | Aberdeenshire Ab53 8En | 2007 |
| Algenmax AS | Førresfjorden | 2024 |
| Algrin AS | Trondheim | 2020 |
| Ali AS | Akkerhaugen | 1996 |