| Acss Global Solutions AS | Kristiansand S | 2023 |
| Act RMC | Fr-38240 Meylan | 2016 |
| Actecan AS | Oslo | 2011 |
| Acticon AS | Oslo | 1999 |
| Acting HR AS | Oslo | 2023 |
| Actio AS | Kristiansand S | 2022 |
| Activ Arctic AS | Tromsø | 2025 |
| Activcare | Dk-2840 Holte | 1996 |
| Active Adventure Travel AS | Oslo | 2015 |
| Active Partner AS | Hølen | 1998 |
| Active Tours AS | Vassenden | 2012 |
| Active Tours International AS | Vassenden | 2025 |
| Active Travel Norway AS | Brusand | 2025 |
| Active Tromso AS | Kvaløya | 2013 |
| Activenorth AS | Skibotn | 2021 |
| Activepeople AS | Grimstad | 2001 |
| Activewebs | Oslo | 2008 |
| Activity Holding AS | Oslo | 2015 |
| Activity Norway AS | Forsand | 2022 |
| Activo Invest AS | Kristiansand S | 2023 |
| Activo Sales AS | Kristiansand S | 2023 |
| Activum Christensen & Hanssen Ans | Nedenes | 1998 |
| Acts Logistik Dienstleistungs Systeme AG | Moss | 2000 |
| Actus AS | Trollåsen | 2002 |
| Actus People AS | Oslo | 2023 |
| Actyon Norway AS | Oslo | 2015 |
| Ad Consultants Pty Ltd | Hammond Park Wa 6164 | 2021 |
| Ad Hoc Tjenester AS | Askim | 2012 |
| Ada AS | Trondheim | 2024 |
| Adapa Care AS | Oslo | 2018 |
| Adapa Systems AS | Oslo | 2013 |
| Adapteo AS | Hokksund | 2018 |
| Adaptive Edge Technologies AS | Lillestrøm | 2022 |
| Adastra Invest AS | Haugesund | 2020 |
| Adcommitto AS | Gjøvik | 1997 |
| Addicts & Habits AS | Oslo | 2013 |
| Addio AS | Oslo | 2022 |
| Addlink AS | Oslo | 2022 |
| Addpersona AS | Oslo | 2003 |
| Addvetro AB | Se-561 34 Huskvarna | 2012 |
| Adecco Business Solutions AS | Oslo | 2018 |
| Adecco Group Norway AS | Oslo | 2005 |
| Adecco Industri AS | Oslo | 2005 |
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| Adecco Outsourcing D.O.O. | Hr 10000 Zagreb | 2021 |
| Adecco Solutions AS | Oslo | 1991 |
| Adept Bemanning&Rekruttering AS | Kristiansand S | 2019 |
| Adept Scientific Nordic | 2600 Glostrup | 2011 |
| Adevinta Growth Partner AB Nuf | Se-753 23 Uppsala | 2013 |
| Adflash AS | Oppaker | 1997 |
| Adhama Holding AS | Bergen | 2004 |
| Adia AS | Moss | 2018 |
| Adiga AB | Se-412 50 Gøteborg | 2015 |
| Adiga Industry AB | Oslo | 2012 |
| Adima AS | Brattvåg | 2023 |
| Adima Energy AS | Brattvåg | 2006 |
| Aditro Logistics Staffing AB | Se-112 51 Stockholm | 2024 |
| Adje Renhold AS | Nordkisa | 2016 |
| Adlani Service Og Vedlikehald AS | Årdalstangen | 2025 |
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| Adleo AS | Røkland | 2018 |
| Adlers Bilformidling AS | Beitstad | 1987 |
| Admar Marta Plaza | Pl-83 209 Godziewo | 2019 |
| Admenta Sweden AB | Oslo | 2015 |
| Admento People AS | Heimdal | 2018 |
| Admiration AS | Nesodden | 2012 |
| Adoks AS | Karmsund | 1995 |
| Adrenalinevent AS | Gjøvik | 2004 |
| Adresseavisens Telefontjenester AS | Trondheim | 1999 |
| Adriatic Tankers AS | Oslo | 2014 |
| Adsmh Aero Lease AS | Kolbjørnsvik | 2023 |
| Adsmh Management AS | Kolbjørnsvik | 2017 |
| Advanced Lyd & Lys Da | Leksvik | 2020 |
| Advanced Sports Installations Europe | Ee-10138 Harju County | 2015 |
| Advela AS | Oslo | 2014 |
| Adventio AS | Oslo | 2015 |
| Adventura Event & Travel AS | Sandnes | 2024 |
| Adventure & Invest AS | Gjerdrum | 2005 |
| Adventure 4 Life AS | Melbu | 2008 |
| Adventure Craft AS | Melsomvik | 2023 |
| Adventure Group AS | Oslo | 2016 |
| Adventure Helgeland AS | Sandnessjøen | 2020 |
| Adventure Hub Narvik AS | Narvik | 2025 |
| Adventure Tailor AS | Oslo | 2018 |
| Adventure Tours AS | Skjolden | 2012 |
| Adventure West AS | Korssund | 2025 |
| Adventures AS | Kvaløya | 2025 |
| Adventures Barcelona AS | Trondheim | 2014 |
| Adverto AS | Sandefjord | 2008 |
| Advest Kontordrift AS | Stavanger | 2019 |
| Advisian Inc | Houston Tx 77079 | 2016 |
| Advokat 1 AS | Stavanger | 2012 |
| Advokatene I Larvik AS | Larvik | 2020 |
| Advokatene På ST. Olavs Plass AS | Oslo | 2015 |
| Advokaterno Da | Stabekk | 1999 |
| Advokatfellesskapet Drift AS | Kristiansand S | 2011 |
| Advokatfellesskapet Norlaw Da | Askim | 1989 |
| Advokatfellesskapet Torget 1 AS | Larvik | 2000 |
| Advokatfirmaet Inkassokontoret AS | Volda | 1987 |
| Advokatfirmaet Nidaros Inkasso Ans | Trondheim | 2009 |