| Alphas AS | Tyristrand | 2013 |
| Alpin 5 Eood | Bg-8000 Burgas | 2016 |
| Alpitronic Norway AS | Oslo | 2024 |
| Alpiwork SP. Z O.O. Nuf | Pl-95-100 Zgierz | 2025 |
| Alpma Alpenland Maschinenbau GmbH | De-83543 Rott Am Inn | 2016 |
| Alpma Drift AS | Ringebu | 2023 |
| Alptec AS | Nesbyen | 1996 |
| Alrek Mek & Service AS | Sparbu | 2020 |
| Alsaker Stål AS | Kleppestø | 1981 |
| Alstad AS | Lundamo | 2011 |
| Alstad Graving Og Vedlikehold AS | Levanger | 2023 |
| Alstad Mekaniske AS | Kyrksæterøra | 2025 |
| Alstom Carbon Capture GmbH | 55252 Mainz-Kastel | 2010 |
| Alstom Engineering and Services Limited | Stavanger | 2010 |
| Alstom Power Ltd | Rugby Cv21 2Nh | 2011 |
| Alstom Transport | 93400 St Ouen | 2010 |
| Alstom Transport Deutschland GmbH | De-38239 Salzgitter | 2025 |
| Alstom Transport Norway AS | Oslo | 2014 |
| Alsvik Maskin AS | Tau | 2026 |
| Alsvåg AS | Sortland | 2002 |
| Alsvåg Lakseslakteri AS | Alsvåg | 1988 |
| Alt Av Tjenester Ltd Nuf | Skien | 2023 |
| Alt I 3 AS | Longyearbyen | 2016 |
| Alta Anlegg & Industriservice AS | Alta | 2020 |
| Alta Maskinering AS | Alta | 2020 |
| Alta Mekaniske Verksted AS | Alta | 2007 |
| Alta Stål & CNC Maskinering AS | Alta | 2009 |
| Alta Takstoler AS | Alta | 2008 |
| Altabunad AS | Alta | 2007 |
| Alteka AS | Lødingen | 2021 |
| Altieik AS | Trondheim | 2005 |
| Altieng AS | Stavern | 1998 |
| Altifrisk AS | Oslo | 2025 |
| Altikran&Industri AS | Oslo | 2017 |
| Altilaft AS | Oppdal | 2025 |
| Altiplast Lasse Willumsen | Inndyr | 2013 |
| Altirep AS | Egersund | 2026 |
| Altisveis AS | Bryne | 2022 |
| Altokinetics AS | Hafrsfjord | 2021 |
| Altym AS | Oslo | 2021 |
| Alu International Shipyard Spolka Z.O.O. | Pl-80643 Gdansk | 2013 |
| Alu Metall Grupp | 10129 Tallin, Harjumaa | 2015 |
| Alu Rehab AS | Klepp Stasjon | 1986 |
| Alu Stigen AS | Kristiansand S | 1994 |
| Alu-Consult Bur AS | Brøttum | 2010 |
| Alu-Stål Kommanditbolag | 65471 Karlstad | 2007 |
| Alu-Team AS | Enebakk | 2012 |
| Alu-Teck AS | Ørsta | 1985 |
| ALU316 AS | Godvik | 2015 |
| Alubend Eiendom AS | Kapp | 2010 |
| Alubend Holding AS | Kapp | 2010 |
| Aludyne Norway AS | Farsund | 2017 |
| Aluform AS | Sømna | 2020 |
| Aluhak Produksjon AS | Årdal I Ryfylke | 2017 |
| Alumetall Norge AS | Tonstad | 2014 |
| Aluminium Fasader AS | Larvik | 1995 |
| Aluminiumsbearbeiding AS | Skotterud | 2000 |
| Alunord Alumiinium Oü Nuf | Tromsø | 2026 |
| Alupro-N AS | Tiller | 1984 |
| Aluprodukter AS | Haukeland | 2020 |
| Alustar AS | Sola | 1994 |
| Alustrax AS | Kristiansand S | 2004 |
| Alustål AS | Råde | 1999 |
| Alustål Holding AS | Råde | 2012 |
| Alutec AS | Os | 1986 |
| Alutech AS | Kolbu | 2006 |
| Alux Stiklojumi Sia Nuf | Lv- 2133 Ropazu Nov. | 2020 |
| Alva Form AS | Mørsvikbotn | 2012 |
| Alva Industries AS | Trondheim | 2017 |
| Alvdal Bryggeri AS | Alvdal | 2025 |
| Alvdal Skurlag AS | Alvdal | 2012 |
| Alvdalskjøkken Da | Alvdal | 1995 |
| Alvdalsstolpen AS | Alvdal | 2003 |
| Alveland AS | Dverberg | 2009 |
| Alvelandet AS | Bryne | 2017 |
| Alver Bakeri & Catering AS | Isdalstø | 2024 |
| Alver CNC AS | Isdalstø | 2019 |
| Alver Gravering AS | Frekhaug | 2023 |
| Alver Stein Og Betongprodukter AS | Isdalstø | 2022 |
| Alversund Handverksbryggjeri AS | Alversund | 2014 |
| Alvestad Holdco AS | Oslo | 2026 |
| Alvestad Marin AS | Oslo | 2003 |
| Alvi Group AS | Leksvik | 1961 |
| Alvøen Marina AS | Mathopen | 1997 |
| Alwin Silba AS | Karasjok | 2017 |
| Am Mek Verksted Lakk Customs AS | Meisingset | 2013 |
| Am Nutrition AS | Stavanger | 2004 |
| Am Vilt Og Catering AS | Åmot | 2014 |
| Am-Agri AS | Finnøy | 2007 |
| Amandus Kahl GmbH & Co. KG | De-21465 Reinbek | 2025 |
| Amandy Breezy AB | Se-114 35 Stockholm | 2023 |
| Amargo Spolka Z Ograniczona Odpowiedzialnoscia Spolka Komandytowa Nuf | 05-850 Ozarow Mazowiecki | 2025 |
| Amdam Sag Og Høvleri AS | Ørskog | 1987 |
| Amdam Sag Og Høvleri Drift AS | Ørskog | 2025 |
| Amedia Russia AS | Kjeller | 2006 |
| Amedia Trykk AS | Kjeller | 2014 |
| Amedia Trykk Bodø AS | Bodø | 2016 |
| Amedia Trykk Innlandet AS | Biri | 2014 |
| Amedia Trykk Lillestrøm AS | Kjeller | 1986 |
| Amg Gruppen AS | Larvik | 2024 |