| Allianz | — | — | München | Germany |
| Allianz Arena München Stadion GmbH | — | — | München | Germany |
| Allion Alternative Energieanlagen GmbH | — | — | Karlsruhe | |
| Allit Werk | — | — | Bad Kreuznach | Germany |
| Allomess | — | — | Hückeswagen | Germany |
| Allresist GmbH | — | — | Strausberg | Germany |
| Alois Müller GmbH | — | — | Ungerhausen | Germany |
| Alois Riedl Landwirtschaft | — | — | Waldsassen | Germany |
| Alpena Energy Solutions GmbH | — | — | Bad Reichenhall | Germany |
| Alpu GmbH | — | — | Mengen | Germany |
| Alterric GmbH | — | — | Aurich | Germany |
| Alto-Products Im- und Export GmbH | — | — | Redmond | United States |
| Alu Team | — | — | Wolfhagen | Germany |
| Aluminium Féron GmbH & Co. KG | — | — | Düren | Germany |
| Aluminium Giesserei Eggingen GmbH | — | — | Eggingen | Germany |
| Alva Energie GmbH | — | — | Berlin | Germany |
| Alz Kies und Recycling GmbH | — | — | Tacherting | Germany |
| Amandus Kaufmann GmbH | — | — | Hamburg | Germany |
| Amazon Deutschland S37 Transport GmbH | — | — | Bad Urach OT Hengen | Germany |
| Amazon.com, Inc. | — | +49 2062 661000 | — | Germany |
| Amazon.de (R) | impressum@amazon.de | — | Luxemburg | Luxembourg |
| Amnis Energy GmbH | — | — | Hamburg | Germany |
| Ampere GmbH | — | — | Karlsfeld | Germany |
| Amperehouse | — | — | — | |
| Amw Nützlinge | — | +49 7032 9578-3 | Pfungstadt | Germany |