| Askøy Rørservice AS | Kleppestø | 2020 |
| Askøy Snekkerservice AS | Erdal | 2024 |
| Askøy Tippen AS | Kleppestø | 2005 |
| Askøy Transport Service AS | Hauglandshella | 2014 |
| Askøy Tømrerservice AS | Hauglandshella | 2018 |
| Askøy VVS AS | Hauglandshella | 2013 |
| Askøy-Bergen Elektro AS | Kleppestø | 1990 |
| Asla Maskin AS | Brumunddal | 2023 |
| Aslagsen Holding AS | Tveit | 2007 |
| Aslak Øyna Maskinentreprenør AS | Iveland | 2008 |
| Aslaksrud AS | Oslo | 2006 |
| Aslaksrud Holding AS | Hønefoss | 2022 |
| Asle P Entreprenør AS | Asker | 1994 |
| Asle Rundberg AS | Melhus | 2012 |
| Asles Maling Og Jernvare AS | Hauge I Dalane | 2001 |
| Asm Andersen Smede & Montageteknik V/ Erik Andersen | Dk-9560 Hadsund | 2015 |
| Asmaløy Bygg AS | Vesterøy | 2015 |
| Asmo AS | Fosnavåg | 2022 |
| Asmund Kamp AS | Kvam | 1996 |
| Asmussen & Holmelund Aps | Lillestrøm | 2004 |
| Asne Bygg AS | Oslo | 2018 |
| Aso Bygg Ans | Bødalen | 2002 |
| Asoma Hanssen AS | Sortland | 2016 |
| Asone AS | Laksevåg | 2013 |
| Asor Da | Rendalen | 2025 |
| Asp AS | Beitstad | 2020 |
| Asp Bygg AS | Billingstad | 2020 |
| Asp Production & Design AB | Se-182 62 Djursholm | 2012 |
| Asp Tjenester AS | Tiller | 2018 |
| Asp VVS AS | Vinterbro | 2018 |
| ASP1 Eiendom Og Invest AS | Trondheim | 2021 |
| ASP1 Holding AS | Trondheim | 2020 |
| Aspa Bygg AS | Øydegard | 2020 |
| Aspaker Rør AS | Harstad | 2014 |
| Aspelia Invest AS | Alta | 2024 |
| Aspelund Elektro AS | Lommedalen | 2004 |
| Aspen & Haug Da | Oslo | 2011 |
| Aspenes Rør AS | Os | 2023 |
| Asphaug AS | Blomsterdalen | 2023 |
| Asphaug Maskin AS | Blomsterdalen | 1993 |
| Aspheim Gulv AS | Filtvet | 2025 |
| Aspheim Gulv Og Bygg AS | Filtvet | 2023 |
| Aspheim Holdingselskap AS | Filtvet | 2024 |
| Aspira AS | Oslo | 2016 |
| Aspn Automatikkspesialisten AS | Mysen | 2005 |
| Aspvik Bygg AS | Hakadal | 2021 |
| Aspås Maskin AS | Verdal | 2022 |
| Aspåsen Panorama AS | Kristiansund N | 2011 |
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| Assa Abloy Entrance Systems Production Skellefteå AB | Se-931 76 Skellefteå | 2014 |
| Assemble-It AS | Lommedalen | 2021 |
| Assembler AB | Se-116 49 Stockholm | 2026 |
| Assemblin AS | Oslo | 1992 |
| Assemblin Caverion Norge AS | Oslo | 1987 |
| Assemblin El AB | Se-126 30 Hägersten | 2010 |
| Assemblin Ventilasjon AS | Lier | 1992 |
| Assemblin Ventilation AB | Se-213 76 Malmö | 2024 |
| Assentoft Silo A/S Nuf | 8900 Randers | 2011 |
| Asset Group AS | Oslo | 2026 |
| Asset Group Stor-Oslo Bygg Og Eiendom AS | Oslo | 2026 |
| Assev Bygg AS | Arendal | 1997 |
| Assi AS | Drøbak | 2023 |
| Assistance AS | Birtavarre | 2019 |
| Assistent Partner AS | Lier | 1996 |
| Assmont GmbH | At-9556 Liebenfels | 2015 |
| Assmont Steel Hungaria KFT | Hu-8308 Zalahalap | 2017 |
| Ast Service AS | Haugesund | 2020 |
| Astel Modular Oü | Ee-61715 Torvandi Alevik, Kambja V | 2019 |
| Asteri Malerfirma AS | Stavanger | 2025 |
| Asto Elektro AS | Fagerstrand | 2021 |
| Astra Bygg & Entreprenør AS | Sparbu | 1997 |
| Astra Bygg & Montering AS | Fjerdingby | 1982 |
| Astra Holding AS | Valestrandsfossen | 2005 |
| Astrakom AS | Vøyenenga | 1998 |
| Astrakom Holding AS | Vøyenenga | 2010 |
| Astrimant AB Nuf | Se-665 35 Kil | 2026 |
| Astrio Entreprenad AB Nuf | Se-418 34 Göterborg | 2025 |
| Astrium S.R.O. Nuf | Sk-92701 Sala | 2026 |
| Astro Holding AS | Nyborg | 2005 |
| Astro Ventilasjon AS | Tyristrand | 2026 |
| Asturi Holding AS | Kragerø | 2005 |
| Asv Bygg & Service AS | Brumunddal | 2017 |
| At Anlegg AS | Sem | 2017 |
| At Blikk AS | Fredrikstad | 2014 |
| At Bygg Og Rehabilitering AS | Laksevåg | 2021 |
| At Bygg Og Vedlikehold AS | Nesttun | 2013 |
| At Byggentreprenør AS | Oslo | 2023 |
| At Cranes AS | Narvik | 2021 |
| At Drift AS | Lysaker | 2024 |
| At Konsern AS | Nord-Statland | 2024 |
| At Lift & Maskinutleige AS | Ørsta | 2007 |
| At Malerservice AS | Hakadal | 2022 |
| At Portsystemer AS | Nord-Statland | 2024 |
| At Rigg Bygg AS | Finstadjordet | 2016 |
| At Rør AS | Randaberg | 1988 |
| At Rørservice AS | Trondheim | 2014 |
| At Rørtek AS | Eikefjord | 2025 |
| At Ventilasjon AS | Risør | 2025 |
| At-Bau Monika Kaczarewska | Pl-10-692 Olsztyn | 2016 |
| At-Bygg AS | Stokke | 2018 |