| AMS Technologies AG | Bavaria |
| ams.Solution AG | North Rhine-Westphalia |
| AMSilk GmbH | |
| Amuzed GmbH | |
| AMZ Sicherheitsdienste GmbH | Berlin |
| Anabrid GmbH | |
| Anacode GmbH | |
| Analog Digitalagentur | Baden-Württemberg |
| Analog Microelectronics GmbH | Rhineland-Palatinate |
| ANALYTICA GmbH | |
| AnalyticaA | |
| Analytical-software | Baden-Württemberg |
| AnalytiChem GmbH | |
| Analyticom | |
| Analyticon Biotechnologies GmbH | |
| Analytik Jena GmbH & Co. KG | |
| Ananda Ventures GmbH | |
| anatom5 perception marketing GmbH | North Rhine-Westphalia |
| Anbio Biotechnology Ltd | |
| Anbit GmbH | |
| ANC Systemhaus GmbH | |
| ANCA Europe GmbH | |
| Ancud IT-Beratung GmbH | Bavaria |
| Anders und Sehr GmbH | Baden-Württemberg |
| Anders und Seim Neue Medien GmbH | Hesse |
| Anders+Kern Präsentationssysteme GmbH & Co. KG | North Rhine-Westphalia |
| Andersen Germany GmbH | |
| Andersen Marketing KG | |
| Anderson Electronic | Baden-Württemberg |
| André Hennen | |
| André Rohrmüller | digitale medien | Baden-Württemberg |
| Andrea Weber | Baden-Württemberg |
| Andreas Breitschopp Softwareberatung und -entwicklung | Bavaria |
| Andreas Geiger | |
| Andreas Horvath Informationstechnologien | Bavaria |
| Andreas Kempf | Hamburg |
| Andreas Mayer IT-Services | North Rhine-Westphalia |
| Andreas Recek Designer | North Rhine-Westphalia |
| Andreas Rieder | North Rhine-Westphalia |
| Andreas Rodeck Webdesign | Hesse |
| Andreas Sandmann | Hesse |
| Andreas Schrade | |
| Andreas Unkelbach | Hesse |
| Andrzejewski | Berlin |
| Andtek GmbH | Bavaria |
| Andus Electronik GmbH | Berlin |
| Anfimau Industry Solutions GmbH | |
| ANGEL Internet Services GmbH | North Rhine-Westphalia |
| Angelize Program GmbH | |
| Angerer & Weimar GmbH | |