| Andreassen Bygg AS | Tromsdalen | 2015 |
| Andreassen Bygg Og Service AS | Farsund | 2023 |
| Andreassen Dykkerservice AS | Bjørndalstræ | 2024 |
| Andreassen Elektro AS | Drammen | 2004 |
| Andreassen Multiservice AS | Melbu | 2022 |
| Andreassen Råd & Vedlikehold AS | Torp | 2024 |
| Andree Hobrak Byggtjenester AS | Grimstad | 2020 |
| Andresen & Far AS | Gjerdrum | 1993 |
| Andresen Byggservice AS | Trondheim | 2022 |
| Andresen Og Borthen AS | Ytre Enebakk | 1998 |
| Andresen Og Sønn AS | Oslo | 2002 |
| Andrew Lucas Limited | Gb-London Nw2 6Ew | 2018 |
| Andritz Hydro Canada Inc. | Jevnaker | 2015 |
| Andritz Hydro Ltd. Sti. | Tr-06531 Cankaya Ankara | 2017 |
| Andritz Hydro Sro | Jevnaker | 2016 |
| Andritz Hydro Unipessoal Lda | Jevnaker | 2015 |
| Andrzej Lizon Andrzej | 34-608 Kamieniec | 2007 |
| Andrzej Ruczynski Andrzej | 82-3 Elblag | 2008 |
| Andrzej Skrzypek Nuf | Pl-59-700, Gm Boleslawiec | 2025 |
| Andrzej Swiostek | Pl-80-333 Gdansk | 2019 |
| Andrzej Szydlowski | Dzierzoniow | 2013 |
| Andrzej W. Ostroga | Helgeroa | 2005 |
| Andrzej Wojcik Ander | 42-450 Lazy | 2006 |
| Andrzej Zelech | 74-100 Gryfino | 2007 |
| Andrè Larsen Boligutvikling AS | Jessheim | 2006 |
| André Eklund | 43370 Sävedalen | 2008 |
| Andrée Golv AB Nuf | Se-123 53 Farsta | 2026 |
| Andy Bygg Og Anlegg AS | Stavanger | 2015 |
| Andy Byggservice AS | Bergen | 2018 |
| Andy Holding AS | Oslo | 1990 |
| Andygroup AS | Oslo | 2014 |
| Andås Bygg AS | Mosby | 2017 |
| Andås Rør AS | Flekkerøy | 2003 |
| Andøy Bygg Og Vedlikehold AS | Bleik | 2010 |
| Andøy Installasjon AS | Andenes | 2022 |
| Aneh AS | Oslo | 2022 |
| Anes Bygg Og Bad AS | Oslo | 2023 |
| Anfinsen Holding AS | Tertnes | 2021 |
| Anfra OY Nuf | Fi-90440 Kempele | 2025 |
| Angard Kran Og Invest AS | Kråkerøy | 2026 |
| Angel Næringsbygg Da | Trondheim | 1998 |
| Angell Bygg AS | Sandnes | 2018 |
| Angell's Maling Og Belegg AS | Ankenes | 2016 |
| Angelsen Malerservice AS | Bjerka | 2005 |
| Angeltveit & Solsvik Murarforretning AS | Steinsland | 2024 |
| Angen Service AS | Rjukan | 2021 |
| Angermo Byggmester Og Rørleggerservice AS | Oslo | 2023 |
| Angermo Byggmester Og Rørservice AS | Oslo | 2017 |
| Angermo Holding AS | Oslo | 2022 |
| Angi Renovation AS | Sandnes | 2018 |
| Angianna AS | Sandnes | 2019 |
| Anglo Europe Limited | Ducks Cross Wildenj Bedford | 2011 |
| Ango AS | Saltnes | 2005 |
| Ango Brønnboring AS | Råde | 1988 |
| Angre Invest AS | Flatdal | 2005 |
| Angus Jamieson Consulting Limited | Inverness Iv1 1Sx Scotland | 2015 |
| Angvik Elektro AS | Eidsvåg I Romsdal | 2004 |
| Angvik Grytnes Entreprenør AS | Sunndalsøra | 1974 |
| Aniksdal Bygg AS | Nærbø | 2015 |
| Animonhus AB | 473 31 Henån | 2001 |
| Anita Og Petter's Service Og Vedlikehold AS | Nordre Frogn | 2025 |
| Anita's Bygg Og Anlegg AS | Tangen | 2023 |
| Ank Service AS | Rælingen | 2020 |
| Anke Melchert | Sortland | 2008 |
| Ankenes Malerservice AS | Ankenes | 2016 |
| Anker Bygg Prosjekt AS | Son | 2014 |
| Anker Dykkerselskap Da | Kristiansand S | 1989 |
| Anker Holding AS | Son | 2017 |
| Anker Solutions AS | Eiken | 2024 |
| Anker Solutions Invest AS | Eiken | 2024 |
| Ankerhaugen AS | Stavanger | 2012 |
| Ankersten Consult AS | Hurdal | 2026 |
| Anko-Holding AS | Tennfjord | 2012 |
| Ankran AS | Oslo | 2018 |
| Ankran Entreprenør AS | Oslo | 2019 |
| Anlegg & Eiendom AS | Froland | 2017 |
| Anlegg & Fjellteknikk AS | Haugesund | 2011 |
| Anlegg & Industri Support AS | Utskarpen | 2021 |
| Anlegg & Infrastruktur AS | Grålum | 2020 |
| Anlegg & Maskin AS | Sørreisa | 1998 |
| Anlegg & Snøservice AS | Øvrebø | 2012 |
| Anlegg 24 AS | Ålesund | 2020 |
| Anlegg AS | Valestrandsfossen | 2010 |
| Anlegg Innlandet AS | Dokka | 2017 |
| Anlegg Nord AS | Alta | 2013 |
| Anlegg Og Entreprenørservice Aoes AS | Trondheim | 2018 |
| Anlegg Og Graveservice AS | Ålesund | 2017 |
| Anlegg Og Transport Sør AS | Søgne | 2008 |
| Anlegg Og Transporttjenester AS | Flateby | 2018 |
| Anlegg Og Tunnel Support AS | Vinje | 2020 |
| Anlegg Og Vedlikehold Gol AS | Gol | 2007 |
| Anlegg Sarpsborg AS | Klavestadhaugen | 2019 |
| Anlegg Snørydding Drift AS | Arendal | 2016 |
| Anlegg Stål Og Bygg AS | Larvik | 1988 |
| Anlegg Sør AS | Mandal | 2007 |
| Anlegg Sør-Øst AS | Tønsberg | 2026 |
| Anlegg Vest AS | Kleppestø | 2016 |
| Anlegg Vest Tunnel AS | Kleppestø | 2020 |
| Anlegg Vest Tunnel AS | Kleppestø | 2025 |
| Anlegg Øst Entreprenør AS | Lillehammer | 2013 |