| Irmler IT-Solutions | Upper Austria |
| IRQ Internet Service 4u | Vienna |
| irregular.at OG | Vienna |
| ISIS Papyrus Europe AG | Vienna |
| ISOPARTNER Austria GmbH | |
| issp e.U. | Lower Austria |
| IT Sentinel | Vienna |
| IT Solution GmbH | Vienna |
| it+t Informationstechnologie + Telekommunikation GmbH | Salzburg |
| IT-Management | Vienna |
| ITdesign Software Projects & Consulting GmbH | Vienna |
| ITEC Tontechnik und Industrieelektronik Gesellschaft mbH | Styria |
| Ithuba FinMill GmbH | |
| ITis4u Informationsservice GmbH | Upper Austria |
| ITpool GmbH | Upper Austria |
| iTranslate GmbH | |
| ITusability | Vienna |
| ITworx Solutions AT GmbH | |
| IXOPAY GmbH | |
| JAMJAM | Vienna |
| Janus Net·Works | Tyrol |
| JCT Consulting & Trading GmbH | Lower Austria |
| JEGO-Design | Salzburg |
| JLP Health GmbH | |
| JMC | |
| Joanneum Research | |
| Jobchain GmbH | |
| Jobcity.at | Lower Austria |
| Joblist.app | |
| JobRocker International GmbH | |
| jobs Personalberatung | Vienna |
| Johannes Bachinger | Upper Austria |
| Johannes Jarolim | Salzburg |
| Johannes Kepler Universität - Industrial Mathematics Institute | Upper Austria |
| Johannes Kepler Universität - Institut für Systemsoftware | Upper Austria |
| Johannes Kepler Universität - Institute of Computational Mathematics | Upper Austria |
| Johannes Kepler Universität Linz | Upper Austria |
| Johannes Kepler Universität Linz - Institut für Algebra | Upper Austria |
| Johannes Kepler Universität Linz - Institut für Wirtschaftsinformatik Software Engineering | Upper Austria |
| Johannes Kepler University - Department of Computer Science | Upper Austria |
| Johannes Kepler University - Research Institute for Symbolic Computation | Upper Austria |
| Johannes Kepler University Linz - Department of Knowledge-Based Mathematical Systems | Upper Austria |
| Joinvision e-Services GmbH | Vienna |
| JOP - Java Optimized Processor | Vienna |
| Josef Pötzl | Carinthia |
| Journi GmbH | |
| Junge Römer GmbH | |
| Junior Enterprises Austria | |
| K2netsolutions Consulting GmbH | Vienna |
| Kaindl Informatics GmbH | Styria |