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| AI Accounting AS | Drøbak | 2016 |
| AI Renhold &Vaktmestertjenester AS | Finstadjordet | 2024 |
| Aidea AS | Oslo | 2009 |
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| Aifix AS | Vestre Åmøy | 2015 |
| Aigesa AS | Krokelvdalen | 2020 |
| Ailt (E) Mulig AS | Beitstad | 2018 |
| Aim Italy S.R.L. | It-20134 Milano | 2025 |
| Aimei AB Nuf | Se-215 60 Malmö | 2026 |
| Ainas Invest AS | Hundvåg | 2022 |
| Aine Fishing Company Limited | Co Donegal | 2015 |
| Aip Utleie AS | Oslo | 2015 |
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| Air Ticket AS | Oslo | 2003 |
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| Aircoil AB | Se-672 32 Årjäng | 2021 |
| Aircontact Aviation Management AS | Oslo | 2014 |
| Aircontact Group AS | Oslo | 2003 |
| Airjob AS | Morvik | 2017 |
| Airlift Helikopter AS | Bygstad | 2024 |
| Airlift Puma AS | Bygstad | 2024 |
| Airline Marketing and Sales Aps Nuf | Oslo | 2004 |
| Airport Staff GmbH | De-50226 Köningsdorf | 2019 |
| Airswift Norge AS | Sandnes | 1998 |
| Aiu AS | Sandnes | 2022 |
| Aiwa Rental AS | Oslo | 2021 |
| Aj Handyman AS | Oslo | 2016 |
| Aj Maskinutleie AS | Mjøndalen | 2017 |
| Aj Motor AS | Ålgård | 2019 |
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| Ak Anleggstjenester AS | Drangedal | 2019 |
| Ak Eiendomsservice AS | Sørumsand | 2012 |
| Ak Golf Group AS | Borgenhaugen | 2021 |
| Ak Instrument Services Limited | Warrington Wa1 1Rg | 2020 |
| Ak Jensen Investment Management Limited Nuf | Oslo | 2021 |
| Ak Kran Og Transport AS | Gamle Fredrikstad | 2006 |
| Ak Kvalitet Renhold AS | Rasta | 2024 |
| Ak Renhold AS | Borgen | 2023 |
| Ak Service AS | Vennesla | 2023 |
| Ak Sikkerhet AS | Oslo | 2024 |
| Ak Solid Ground Ans | Skien | 2026 |
| Ak Systems Solutions Ltd | Aberdeenshire Ab39 3Pf Scotland | 2016 |
| Ak-Maskinutleie AS | Levanger | 2025 |
| Akademikerne Pluss AS | Oslo | 2018 |
| Akasia Gravstell AS | Laksevåg | 2015 |
| Akat Utleie AS | Veavågen | 2026 |
| Ake & Alpin Turister Da | Stabekk | 2000 |
| Akelia AS | Solbergelva | 2018 |
| Akelius AS | Solbergelva | 2018 |
| Aker Eiendomsservice Ans | Asker | 2004 |
| Aker Engineering Malaysia SDN BHD | Fornebu | 2014 |
| Aker MH Inc | Fornebu | 2010 |
| Aker Powergas Subsea Private Limited | Fornebu | 2013 |
| Aker Solutions Angola Ltd | London W4 5Hr England | 2016 |
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| Aker Trepleie AS | Oslo | 2016 |
| Akerholt AS | Hof | 2001 |
| Akerman SP. Z. O. O. | Pl-83-200 Starogard Gdanski | 2019 |
| Akershus Bil & Byggmegler AS | Fetsund | 2017 |
| Akershus Bilutleie AS | Lørenskog | 2025 |
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| Akershus Eiendomservice AS | Strømmen | 1995 |
| Akershus Entreprenør Holding AS | Jessheim | 2012 |
| Akershus Fasilitetsstyring AS | Sørumsand | 2024 |
| Akershus Landskap AS | Rælingen | 2020 |
| Akershus Lås Og Snekkerservice AS | Blystadlia | 2016 |
| Akershus Maskin Og Hengerutleie AS | Aurskog | 2025 |
| Akershus Maskinutleie AS | Skedsmokorset | 2022 |
| Akershus Miljøentreprenør AS | Haslum | 1993 |
| Akershus Renhold & Service AS | Hvittingfoss | 2025 |
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| Akershus Utemiljø AS | Gjerdrum | 2013 |
| Akershusgartneren AS | Kløfta | 2009 |
| Akevittruten AS | Hamar | 2011 |
| Akg Rengjøring AS | Stokmarknes | 2026 |
| Akg Rengjøring AS | Stokmarknes | 2006 |
| Aki AS | Asker | 2013 |
| Akinom AS | Gamle Fredrikstad | 1996 |
| Akita AS | Hjellestad | 1994 |
| Akkodis Norway AS | Oslo | 1988 |
| Akmelhus Holding AS | Oslo | 2017 |
| Akobe AS | Bærums Verk | 2006 |
| Akofs 3 AS | Lysaker | 2008 |
| Akofs I AS | Lysaker | 2007 |
| Akor AS | Trondheim | 2023 |
| Akreberg AS | Trysil | 2023 |
| Aksa Renhold AS | Moss | 2020 |
| Aksel Renhold AS | Fjellhamar | 2011 |
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| Aksess Bemanning AS | Arendal | 2019 |
| Aksess Holding AS | Arendal | 2019 |
| Aksjeselskap Salangsvask | Sjøvegan | 2022 |
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| Aksjon Soningstegn Fredstjeneste | De-10117 Berlin | 2017 |