| Invisio | Lesser Poland |
| Invito.pl | Pomeranian |
| IP Partner | Masovian |
| IP Systems Automatyka | Greater Poland |
| iPOS S.A. | |
| IQ PL Sp. z o.o. | Pomeranian |
| IQCST | Pomeranian |
| Ironsoft | Masovian |
| iSource S.A. | Masovian |
| ISTS | Lesser Poland |
| IT Bridge | Masovian |
| IT Component | Opole |
| IT Partner | |
| IT School | Greater Poland |
| IT Vision | Lesser Poland |
| IT-BOX | Lower Silesian |
| IT-Dev Sp. z o.o. | Lower Silesian |
| IT-SOLVE Mobility Business Partner | |
| IT-SYSTEM | Lower Silesian |
| IT.integro Sp. z o.o. | Greater Poland |
| iTaxi.pl S.A. | |
| ITB Vega | Kuyavian-Pomeranian |
| ITCraft | Kuyavian-Pomeranian |
| itDesk Advertising | |
| itDesk Sp z o.o. | Opole |
| ITECH Sp. z o.o. | Świętokrzyskie |
| Itelite Antennas | Lower Silesian |
| iteo.com | Silesian |
| Iterative Engineering Sp. z o.o. | |
| Iterators Sp. z o.o. | |
| ITKeyMedia | Masovian |
| ITL | Subcarpathian |
| ITOpen Software | Silesian |
| iTraff Technology Sp. z o.o. | Greater Poland |
| ITTI Sp. z o.o. | Greater Poland |
| Ivendo Connect | Warmian-Masurian |
| iVhosting | Greater Poland |
| Iware Sp. z o.o. | |
| iWeb.pl | Kuyavian-Pomeranian |
| IXION Sp. z o.o. | Silesian |
| IZACOM Sp. z o.o. | Greater Poland |
| J-Labs | |
| j-labs | |
| James Enterprises | |
| JAN.net | Łódź |
| Janbit | Masovian |
| Janko-Soft | Lublin |
| Jantar Sp. z o.o. | Silesian |
| Jarkom | Pomeranian |
| Jaronet&WebVision PIX New Technologies | Greater Poland |