| Alfabygg AS | Slattum | 2014 |
| Alfaelkida AS | Gjøvik | 1993 |
| Alfarnes Entreprenør AS | Sagvåg | 2014 |
| Alfarrustad Bygg AS | Løten | 2022 |
| Alfarrustad Invest AS | Løten | 2022 |
| Alfateamoslo AS | Oslo | 2017 |
| Alfaunion | 11711 Tallinn | 2012 |
| Alfen AS | Godvik | 2017 |
| Alfhaim Bygg AS | Larvik | 2025 |
| Alfis Bygg AS | Ås | 2016 |
| Alfm Holding AS | Nodeland | 2024 |
| Alfoh Bygg AS | Røkland | 1985 |
| Alfred Nesset Automasjon AS | Ålesund | 2012 |
| Alfred Og Pål Hage AS | Vinstra | 1992 |
| Alfred Stelzer Metallbau | 94342 Irlbach | 2010 |
| Alfreds Elektroservice AS | Bodø | 2000 |
| Alfredsson Tak AS | Halden | 2025 |
| Alfs Håndverkertjeneste Da | Sømna | 1998 |
| Alg Bygg AS | Roa | 2024 |
| Algeco Nordics AS | Stavanger | 2020 |
| Algeco Norway AS | Stavanger | 2003 |
| Algirdo Jonaauskio Personal Enterprise | Mazeikai | 2006 |
| Algm Bygg AS | Vikedal | 2025 |
| Algrøy Elektro AS | Fjell | 2007 |
| Algrøy Holding AS | Fjell | 2007 |
| Algård Betong Da | Ålgård | 1993 |
| Alh Investering AS | Blaker | 2024 |
| Alibela Nuf | 90160 Plunges Raj. Sav. Plunges M. | 2018 |
| Alida Invest AS | Kråkerøy | 2012 |
| Alien Rubber AS | Bæverfjord | 2022 |
| Alik Industrikompani AS | Nesttun | 2014 |
| Alimak Group Denmark | Dk-8653 Them | 2025 |
| Alimak Group UK Ltd | Northants Nn10 6Bw | 2009 |
| Alimak Hek Aktiebolag | Se-931 42 Skellefteå | 2000 |
| Alion Bygg AS | Bønes | 2022 |
| Alipson | Ee-71020 Viljandi Maakond | 2017 |
| Alisa Invest AS | Os | 2021 |
| Aliuminio Prekybos Namai Uab | Lt-01109 Vilnius | 2016 |
| Alius Production S.R.O. Nuf | Sk-811 02 Bratislava | 2018 |
| Aljadan Maling AS | Oslo | 2026 |
| Aljos Marine & Industri AS | Kristiansund N | 2014 |
| Alkaja Holding AS | Mo I Rana | 2012 |
| Alkd AS | Paradis | 2025 |
| Alkom II Grzegorz Marek Pastuszak | Haugesund | 2006 |
| Alksnena Nuf | Lt-78150 Siauliai | 2011 |
| All Aspect AS | Bosberg | 2023 |
| All Bygg Drift AS | Oslo | 2005 |
| All Elektro AS | Laksvatn | 2025 |
| All Golf Nuf | Pl-73-110 Stargard Szczecinski | 2021 |
| All Golf Services Norge AS | Drammen | 2021 |
| All in 1 AS | Solbergmoen | 2017 |
| All in Holding AS | Tveit | 2006 |
| All in Service AS | Oslo | 2019 |
| All Konstruksjon AS | Fagerstrand | 2025 |
| All Masters Nuf | Lt-89236 Naikiai Mazeikiu Raj | 2024 |
| All Mine AS | Oslo | 2012 |
| All NRG Skive | Dk-7800 Skive | 2017 |
| All Remove Trondheim AS | Ranheim | 2003 |
| All Service Breim AS | Breim | 2022 |
| All-Bygg AS | Ombo | 1985 |
| All-Rør AS | Klæbu | 1997 |
| All-Rørfornying AS | Trondheim | 2019 |
| All-Tak Falck Og Engedal Ans | Moss | 1991 |
| ALL10 Entreprenør AS | Stavanger | 2019 |
| Allbygg AS | Nesttun | 2017 |
| Allbygg Florø AS | Florø | 1998 |
| Alle Gode Ting Er Tre- AS | Øye | 2024 |
| Alle Mulige Oppdrag AS | Oslo | 2015 |
| Alle Tjenester AS | Stavanger | 2019 |
| Allean Holding AS | Ørje | 2023 |
| Allende Bygg Ans | Oslo | 2023 |
| Allergotskogen BT1 Tilvisning AS | Oslo | 2026 |
| Alles Rørservice AS | Gullaug | 2004 |
| Allfarveg AS | Oslo | 2004 |
| Allfug AS | Ålgård | 1987 |
| Allgrunn AS | Stordal | 2018 |
| Alliance Medical BV | 3818Le Amersfoort South Holland | 2017 |
| Allianse Holding Kragerø AS | Kragerø | 2014 |
| Allianse Montasje AS | Arendal | 2020 |
| Allianse Stillas AS | Kragerø | 2008 |
| Allier AS | Nesttun | 1998 |
| Alliero AS | Oslo | 1999 |
| Allierogruppen AS | Oslo | 1999 |
| Allimep S.R.L. | Perugia | 2013 |
| Allproffs Da | Oslo | 2010 |
| Allrep AS | Stavanger | 2005 |
| Allservice Solør AS | Flisa | 2016 |
| Allsidig Bygg AS | Molde | 2016 |
| Allsidig Byggservice AS | Tana | 2022 |
| Allsidig Elektro AS | Rygge | 2016 |
| Allsidig Maler AS | Oslo | 2012 |
| Allsidig Rørleggertjeneste AS | Tromsø | 2011 |
| Allsidig Snekkertjeneste AS | Tromsø | 2014 |
| Allsidige Bygg AS | Ytre Enebakk | 2011 |
| Allsidige VVS AS | Rælingen | 1995 |
| Allsikring AS | Barkåker | 2017 |
| Alltak AS | Lørenskog | 2015 |
| Alltec AS | Stord | 2018 |
| Alltec Fibre Ltd Nuf | Oslo | 2025 |
| Alltemp AS | Sande I Vestfold | 2020 |