| Angerland-Data GmbH | North Rhine-Westphalia |
| Angular.Schule | Baden-Württemberg |
| Animate | Hesse |
| Anja Braun Webdesign + ‑entwicklung | Baden-Württemberg |
| Ankercloud GmbH | |
| AnkhLabs GmbH | |
| ANKOMM GmbH | |
| ANN2thrive | |
| Anne Wiesmann & Andrea Lissek GbR | Schleswig-Holstein |
| annea.ai GmbH | |
| Another One GmbH | Hamburg |
| ANOVA GmbH | Mecklenburg-Vorpommern |
| ANT Maschinen GmbH | |
| Antagosoft | |
| antares Computer Company | Berlin |
| Antaro GmbH | Lower Saxony |
| ANTEK GmbH | Baden-Württemberg |
| Antennen Electronic Braun GmbH | Lower Saxony |
| ANTENNENTECHNIK Bad Blankenburg GmbH | Thuringia |
| Anti-Spy.Info | Saxony-Anhalt |
| ANTITOXIN GmbH | |
| Antonics ICP GmbH | Brandenburg |
| Antswar | Bavaria |
| Anturec Pharmaceutics GmbH | |
| Anuk GmbH | North Rhine-Westphalia |
| Anuvito GmbH | Thuringia |
| anvajo | |
| Anybill GmbH | |
| AnyDesk Software GmbH | Baden-Württemberg |
| anykey GmbH | North Rhine-Westphalia |
| anyMOTION GmbH | North Rhine-Westphalia |
| Anynines GmbH | Saarland |
| Anyplace IT GmbH | |
| anyWARE AG | Rhineland-Palatinate |
| AO Design | Bavaria |
| AOA Apparatebau Gauting GmbH | Bavaria |
| AOE GmbH | Hesse |
| Aonic GmbH | |
| AOS-Design | Baden-Württemberg |
| AP Design GmbH | Lower Saxony |
| AP Microelectronic GmbH | North Rhine-Westphalia |
| AP&S International GmbH | |
| Apache Friends | Berlin |
| apaleo | |
| APCOA PARKING Holdings GmbH | |
| Apcon AeroSpace and Defence GmbH | |
| Apel-Datensystem GmbH | Hesse |
| APERCO AG | Bavaria |
| Aperto AG | Berlin |
| ApfelAss | Baden-Württemberg |