| Allocation Network GmbH | Bavaria |
| Alloy Software GmbH | |
| Allround-PC.com | North Rhine-Westphalia |
| Alltech GmbH & Co. KG | Rhineland-Palatinate |
| Alltrotec GmbH | Saxony |
| ALLY Gesellschaft für Systemlösungen, Datenbank- und Softwareentwicklung mbH | Berlin |
| Almaron GmbH | |
| Aloaha Software | North Rhine-Westphalia |
| Alogis AG | Berlin |
| ALOS GmbH | |
| Alpas GmbH | |
| ALPEIN Software GmbH | Bavaria |
| Alpha 2000 GmbH | Saxony |
| ALPHA Bürosysteme GmbH | |
| Alpha Com Deutschland GmbH | Hamburg |
| Alpha Computer GmbH | Saxony |
| Alpha EDV GmbH | Lower Saxony |
| Alpha Future Funds | |
| alpha projekt GbR | Berlin |
| Alpha Search | Hesse |
| alpha Soft | Bavaria |
| alpha-bit GmbH | Bavaria |
| alpha-board GmbH | Berlin |
| Alpha-Soft Computer Security GmbH | Saxony |
| Alphabet Type GmbH | |
| Alphabytes.de | North Rhine-Westphalia |
| Alphacool International GmbH | |
| AlphaCron Datensysteme | Thuringia |
| Alphadata Gesellschaft für Softwareentwicklung, Internet und Beratung mbH | North Rhine-Westphalia |
| alphamerisch Webdesign | Baden-Württemberg |
| AlphaPet Ventures GmbH | Bavaria |
| Alphasoft GmbH | North Rhine-Westphalia |
| Alphasystems GmbH | Bavaria |
| Alphatech Computersysteme GmbH | Bavaria |
| Alphin GmbH | |
| Alpine Electronics (Europe) GmbH | Bavaria |
| Alpine Space Ventures Management GmbH | |
| Alptech Elektronik GmbH | Hesse |
| Alschi-Soft oHG | |
| ALSTIN II GmbH | |
| ALSTIN II GmbH | |
| alta4 AG | Rhineland-Palatinate |
| Altair Engineering GmbH | Baden-Württemberg |
| Altair Systems GmbH | Bavaria |
| Altais Webdesign & Internet Service, M. Schulte-Holtey & P. Knippers GbR | North Rhine-Westphalia |
| Altavo GmbH | |
| Alte Försterei Veranstaltungs GmbH & Co. KG | |
| Altech Advanced Materials AG | |
| Altech GmbH | |
| ALTEN GmbH | |