| Bsurance GmbH | Vienna |
| Bundesrechenzentrum GmbH | Vienna |
| Bürosysteme Rottmann GmbH | Styria |
| Business Angel Institute | Vienna |
| Businesscard.at | Vienna |
| bww bitwise works GmbH | Carinthia |
| byrd technologies GmbH | |
| Byte Media GmbH | Lower Austria |
| ByteSource Technology Consulting GmbH | |
| C++ World KG | Lower Austria |
| c.c.com Andersen & Moser GmbH | Styria |
| C.Sitte Softwaretechnik | Salzburg |
| CAD+T Solutions GmbH | Upper Austria |
| CADCAM-Services Franz Reiter | Vienna |
| Callnow | Vienna |
| Calm/Storm Ventures | |
| Calyxha Biotechnologies GmbH | |
| Campus02 | Styria |
| Candera GmbH | |
| Canon Austria GmbH | Vienna |
| Capco Austria GmbH | |
| Carola Zentara | |
| Cashcom Abrechnungssysteme GmbH | Tyrol |
| CashPilot | |
| Celix Solutions GmbH | Vienna |
| Cellectric Biosciences | |
| Celum GmbH | Upper Austria |
| CeMM Forschungszentrum für Molekulare Medizin GmbH der Österreichischen Akademie der Wissenschaften | |
| Center for Integrative Bioinformatics Vienna | Vienna |
| Center for Usability Research & Engineering | Vienna |
| Central European University - Department of Network and Data Science | |
| Centrovox Kabelvertriebs Gesellschaft m.b.H. | Lower Austria |
| CEYONG GmbH | |
| cFactural | |
| CG Shop e.U. | Vienna |
| CHCNET Hosting & Coding | Lower Austria |
| Chilly.domains | Salzburg |
| ChironWells GmbH | |
| Chris Hager | Vienna |
| Christoph Wille | Styria |
| ChromoSoft | Upper Austria |
| Circle17 | |
| Circly | |
| Circonnact | |
| CISC Semiconductor GmbH | Carinthia |
| CLEF Elektronik Consulting GmbH | Vienna |
| Clients-Guide e.U. | |
| Climate Lab | |
| ClockStone | Tyrol |
| Cloudomation | |