| Hostmacher | |
| HostProfis ISP Telekom GmbH | Carinthia |
| Hoststar – Multimedia Networks | Styria |
| HOTdomains Internet Service | Lower Austria |
| hotelkit GmbH | |
| hotze.com GmbH | Tyrol |
| HPL Software KG | Styria |
| HR Force EDV-Beratung GmbH | Vienna |
| HROS | |
| http://www.biosnet.at/ | Vienna |
| Humai Technologies GmbH | Vienna |
| Hutter & Schrantz AG | |
| Hydrogrid GmbH | |
| Hyperwave GmbH | Styria |
| Hypest Hive GmbH | |
| i-netservice.at | Styria |
| i2b – ideas to business | |
| i4g Investment GmbH | |
| i5invest Beratungs GmbH | Vienna |
| i5Next | Vienna |
| IAS Ing. Salcher GmbH | Styria |
| Ibase | |
| IBB Adaptive Solutions GmbH | Vienna |
| IC INTRACOM Vertriebs GmbH | Styria |
| IceKing GmbH | |
| ICLR | |
| ICRA Dumfarth & Schwap OG | Salzburg |
| id-werbeagentur | Salzburg |
| IDC EDV GmbH | Tyrol |
| IdeasOnCanvas GmbH | Vienna |
| IDEC | Styria |
| IDENTI.NET Internet + Software Services GmbH | Vorarlberg |
| iDWELL GmbH | |
| IGS Systemmanagement GmbH & Co. KG | Upper Austria |
| iiNES GmbH | Lower Austria |
| IKARUS Security Software | Vienna |
| illwerke vkw AG | |
| IMA-Systems Information-Technology GmbH | Vorarlberg |
| ImageBiopsy Lab | |
| ImageWare Scannerservice GmbH | Vienna |
| IMC Fachhochschule Krems GmbH | Lower Austria |
| immedi.at | Upper Austria |
| ImmoZ Betriebs GmbH | Styria |
| Impact Hub GmbH | Vienna |
| Impact Hub Vienna | |
| Imprint Analytics GmbH | |
| IMS Ionen Mikrofabrikations Systeme GmbH | Vienna |
| IMSoft - DI Michael Karg | Vienna |
| INAUT Automation GmbH | Lower Austria |
| Indivisual Online Media GmbH | Upper Austria |