| Name | Type | Country |
|---|---|---|
| i68 | Enterprise | Spain |
| Ibarreta S.A. | Enterprise | Spain |
| Iberdrola | Enterprise | Spain |
| Ibermatica | Enterprise | Spain |
| IBM | Enterprise | United States of America |
| Idea75 Srl | Enterprise | |
| Ideograma | Enterprise | |
| IK4 | Enterprise | Spain |
| IKOR Sistemas Electronicos | Enterprise | Spain |
| Ikusi | Enterprise | Spain |