| Aspeggen Landbruk AS | Brandsfjord | 2025 |
| Aspid Engineering AB | 417 28 Göteborg | 2012 |
| Aspirock USA Inc | Nolensville, Tn 37135 | 2025 |
| Asprem Drift Og Service AS | Mauseidvåg | 2025 |
| Aspøypall AS | Øydegard | 2000 |
| Asquith AS | Oslo | 1990 |
| Assaf Holding AS | Oslo | 2018 |
| Assens Shipyard | 5610 Assens | 2014 |
| Assento AS | Oslo | 2015 |
| Assetcare AS | Sandnes | 2014 |
| Assets Da | Oslo | 2011 |
| Assist Air Limited Nuf | Lysaker | 2010 |
| Assist Management AS | Oslo | 2025 |
| Assistera I Sverige AB | 211 43 Malmø | 2012 |
| Assistia AS | Bodø | 2025 |
| Assistly AS | Sandefjord | 2018 |
| Association Européenne Des Loteries Et Totos D'Etat | Be-1040 Etterbeek | 2024 |
| Association for Clinical Data Management Limited | Wantage Ox12 8Pd | 2026 |
| Ast Marine Operations and Management SA | Pa-Costa Del Este | 2020 |
| Ast Utleie AS | Bremnes | 2013 |
| Astag Revisionen AG | Ch-6052 Hergiswil | 2021 |
| Astral International Limited | Douglas Im1 4Ls | 2012 |
| Astrilo Intoto SL | Es-03730 Jávea, Alicante | 2014 |
| Astro Ipr AS | Aurskog | 2024 |
| Astronomy Development Fundation | 1012 Riga | 2006 |
| Astrup Ingeniør Og Entreprenør Firma Nuf | 030353 Bucharest, Sektor 1 | 2011 |
| Asutvikling AS | Kongsvinger | 2022 |
| Aswi AS | Stjørdal | 2012 |
| At Event AS | Drøbak | 2026 |
| Atani Ans | Mandal | 2000 |
| Atd Global Travel Solutions AS | Oslo | 2025 |
| Atd Renhold AS | Rådal | 2020 |
| Atea | Dk-2750 Ballerup | 2014 |
| Atebe AS | Ulsteinvik | 2025 |
| Atec Bemanning AS | Voss | 2010 |
| Atech Holding AS | Skedsmokorset | 2012 |
| Atech Security AS | Skedsmokorset | 2012 |
| Atest Norge AS | Porsgrunn | 2002 |
| Atg Multidrift AS | Holter | 2021 |
| Ath Vedlikehold AS | Oslo | 2018 |
| Athares Holding AS | Åsgårdstrand | 2019 |
| Atia Gruppen AS | Oslo | 2025 |
| Atia Helse AS | Oslo | 2025 |
| Atic Bemanning Da | Oslo | 2009 |
| Atl Investment AS | Eidsvåg I Åsane | 2021 |
| Atl Survey Services Ltd | Hebburn Ne31 2Lu | 2019 |
| Atlantic Explorer Ltd | Bergen | 2011 |
| Atlantic Feeder III AS | Oslo | 2024 |
| Atlantic Feeder IV AS | Oslo | 2025 |
| Atlantic Group AS | Flaktveit | 2025 |
| Atlantic Mobility AS | Molde | 1981 |
| Atlantic Offshore International Crew AS | Straume | 2019 |
| Atlantic Renhold AS | Bryne | 2010 |
| Atlantic Resourcing Limited | Ab11 5Qf Aberdeenshire Scotland | 1998 |
| Atlantic Solutions AS | Kristiansund N | 2026 |
| Atlantis Automater Da | Bødalen | 1994 |
| Atlantis Reiser AS | Oslo | 2002 |
| Atlantix AS | Bønes | 2020 |
| Atlas 182 Global | Macduff Ab44 1Xy | 2015 |
| Atlas Cerno AS | Stavanger | 2011 |
| Atlas Copco Rental Europe | Be-2850 Boom | 2014 |
| Atlas Drift AS | Stavanger | 2008 |
| Atlas Facility Services AS | Oslo | 2015 |
| Atlas Handel AS | Oslo | 2021 |
| Atlas Professionals UK Limited | Bs1 4Xe Bristol | 2009 |
| Atlas Service Group Cyprus Limited | 3083 Limassol | 2008 |
| Atlas Technology Solutions Norway AS | Oslo | 2016 |
| Atlas Tour AS | Oslo | 2014 |
| Atlas X AS | Oslo | 2021 |
| Atle Holbek AS | Lindesnes | 2024 |
| Atlo AS | Bergen | 2020 |
| Atm AS | Os | 1987 |
| Atn AS | Oslo | 2002 |
| Atnt AS | Nodeland | 2017 |
| Atpi Norway AS | Bergen | 1996 |
| Atr 72 MSN 1341 AS | Oslo | 2017 |
| Atr Cleaning Services AS | Oslo | 2018 |
| Atradius Information Services B.V. Nuf | Lysaker | 2007 |
| Atrium Blue Crewing AS | Straume | 2019 |
| Atrium Bygg AS | Oslo | 2006 |
| Atrium People AS | Straume | 2017 |
| Atrym AS | Oslo | 2026 |
| Ats 10 AS | Bergen | 2012 |
| Ats 11 AS | Bergen | 2012 |
| Ats Anna Stankiewicz SP. Z O.O. Nuf | 73-110 Stargard | 2025 |
| Att Marketing AS | Kristiansand S | 2021 |
| Attestog Hansen AS | Porsgrunn | 2025 |
| Atticum Software AS | Larvik | 2002 |
| Attmæ AS | Kleppe | 2019 |
| Attraksjonsdrift AS | Ålgård | 2012 |
| Atå AS | Tverlandet | 2025 |
| AU2X AS | Eidsvoll | 2018 |
| Auctor Security AS | Oslo | 2023 |
| Auda AS | Malm | 2019 |
| Audhumla Ans | Oslo | 2000 |
| Audiopol Live Da | Skien | 2007 |
| Audiovision AS | Drøbak | 2022 |
| Audun Collection AS | Oslo | 2026 |
| Auga AS | Lærdal | 2022 |
| Augustea S.P.A. | 96011 Augusta (Sr) | 2011 |