| Informatikai Intézet, TTIK, Szegedi Tudományegyetem | |
| Infornax Information Technology Zrt. | Veszprém |
| Infotéka Software | Budapest |
| InnoByte | |
| Innomatrix | Budapest |
| Innonic Group | |
| InnVoice Ügyviteli Szoftver Kft. | Budapest |
| Input Program | Budapest |
| INSPYRE | |
| Instalent | |
| Integral Vision | |
| Integrity Kft. | Budapest |
| InteliArt | |
| IntelliFactory | |
| IntelliFactory Kft. | Budapest |
| Intellio Integrated Video System Ltd | |
| Intelliport | |
| Intellisys Kft. | Pest |
| Intellitext | |
| Inter-Computer-Informatika Zrt. | |
| INTER.HU Kft. | Pest |
| Interholding.hu Kft. | Jász-Nagykun-Szolnok |
| InterJNet | Budapest |
| Internet Biztonság EV.-RŐL | Győr-Moson-Sopron |
| Internet Dunaújváros Kft. | Fejér |
| Internet4U | Budapest |
| Intersoft Hungary Kft. | |
| Interword | |
| Intren Kft. | Budapest |
| Intretech Hungary Ltd | |
| Intrex-Hosting Kft. | Budapest |
| Intronet Kft. | Budapest |
| Intuitech Zrt. | |
| Invento Labs Hungary Kft. | |
| Invictus Games Ltd | Hajdú-Bihar |
| Invitech | Pest |
| Invitel | Budapest |
| Iqsoft-John Bryce Oktatóközpont Kft. | Budapest |
| IseeQ Kft. | Budapest |
| iSolutions Kft. | Budapest |
| ISYS-ON Informatikai Tanácsadó Kft. | Budapest |
| ISZT | Budapest |
| IT Cabling Services Hungary Kft. | Budapest |
| IT Hosting Kft. | |
| ITCapital | Budapest |
| ITS Direct Europe | |
| ITSecure Informatikai Tanácsadó Kft. | Budapest |
| itSun Security Kft. | Budapest |
| ITware | Budapest |
| ITZen | |