| Synaxon AG | North Rhine-Westphalia |
| SynchPST | Bavaria |
| Syncope Communication Systems GmbH | Hamburg |
| Synctive GmbH | |
| SyncTwin GmbH | |
| Syncwork AG | Saxony |
| Syndicat IT & Internet | Lower Saxony |
| Syndicats eG | |
| Syneco Trading GmbH | |
| Synera GmbH | |
| Synerpy GmbH | Bavaria |
| Synertronixx GmbH | Lower Saxony |
| Synetics Gesellschaft GmbH | North Rhine-Westphalia |
| Synimmune GmbH | |
| Synium Software GmbH | Rhineland-Palatinate |
| SYNLAB International GmbH | |
| Synsor.ai GmbH i.L. | |
| SynSpace Group GmbH | Baden-Württemberg |
| Syntactix | Hesse |
| SyntaX Software | Hesse |
| syntesion GmbH | |
| syntevo GmbH | Bavaria |
| Syntlogo GmbH | Baden-Württemberg |
| Synx GmbH & Co. KG | Baden-Württemberg |
| Syracom AG | Hesse |
| Syrakus Holding AG | |
| SYS TEC electronic GmbH | Saxony |
| Sys-Manage | Hesse |
| Sys-Pro GmbH | Berlin |
| SYSBACK Solutions GmbH | |
| SYSCAD TEAM GmbH | Lower Saxony |
| SYSCARE Informationssysteme GmbH & Co. KG | Baden-Württemberg |
| SysCon GmbH | North Rhine-Westphalia |
| Syscovery Solve & Serve GmbH | Baden-Württemberg |
| Sysdacom GmbH | Berlin |
| SysEleven GmbH | |
| SYSGO AG | Rhineland-Palatinate |
| Sysgrade eCommerce GmbH | |
| Syska Gesellschaft für betriebliche Datenverarbeitung mbH | Baden-Württemberg |
| SysKon Systemlösungen GmbH | |
| syslab.com GmbH | Bavaria |
| Sysmagine GmbH | |
| sysmind Service- und Vertriebsgesellschaft mbH | |
| Sysob IT-Distribution | |
| syspilot Consulting GmbH | |
| Syspons GmbH | |
| SYSPRO Systemhaus für prof. CAD- und Netzwerklösungen GmbH | Hesse |
| SySS GmbH | |
| SystAG Systemhaus GmbH | Baden-Württemberg |
| Systags GmbH | North Rhine-Westphalia |