| Aixcon Powersystems | — | — | Round Rock | United States |
| Aixtr Solar AG | — | — | Aachen | Germany |
| Aixtra Solar AG | — | — | Aachen | Germany |
| Ak-Automation | — | — | Waizenkirchen | |
| AkkuSer | — | — | — | Finland |
| AkkuSmart Energielösung GmbH | — | — | Leer | Germany |
| Akowi GmbH | — | — | Berlin | Germany |
| Alber GmbH | — | — | Albstadt | Germany |
| Albert Hauser PV | — | — | Brunnthal | Germany |
| Albert und Philipp Dornfried GbR | — | — | Obermarchtal-Reutlingendorf | Germany |
| Albgaubad Ettlingen | — | — | Ettlingen | Germany |
| Albobst Aigner | — | — | Gerstetten | Germany |
| Albright | — | 4401256893060 | Whitchurch | United Kingdom |
| Albtourer Camper - Vermietung | — | +4915209620356 | Römerstein | |
| Aldi Nord | — | — | Bad Harzburg | Germany |
| Aldi Nord Bielefeld | — | — | Bielefeld | Germany |
| Alexander Vaas | — | — | Nettetal | Germany |
| Alfred Thun GmbH | — | — | Ennepetal | Germany |
| AliExpress | — | — | San Mateo | United States |
| Alice | — | +49 33395 71222 | Fanø | Germany |
| Allaoui Graphic Machinery | — | +49 241 1892750 | Aachen | |
| Alle Rechte vorbehalten | — | — | — | |
| Allfrisch Geflügel-Produktions GmbH | — | — | Emsdetten | Germany |
| Allgäu Metalle - NE-Metalle für Profis | — | — | — | Germany |
| Allgäuer Alpenwasser | — | — | Oberstaufen | Germany |