| Name | Type | Country |
|---|---|---|
| GTS-THAUMAT XXI S.A. | Enterprise | |
| Guide | Enterprise | France |
| Hanshin University | University | Korea |
| Hellenic Telecommunications & Telematics Applications Company | Enterprise | Greece |
| Humanist | Enterprise | |
| Ibarreta 2000 | Enterprise | Spain |
| IDEKO-IK4 | Enterprise | Spain |
| Idom | Association | Spain |
| Ikerlan IK4 | Enterprise | Spain |
| Ikor Metering | Enterprise | Spain |