| Iterative Engineering Sp. z o.o. | |
| Iterators Sp. z o.o. | |
| ITgenerator Sp. z o.o. | |
| ITHOUSE Sp. z o.o. | |
| ITKeyMedia | Masovian |
| ITL | Subcarpathian |
| ITMakeovers | |
| ITOpen Software | Silesian |
| iTraff Technology Sp. z o.o. | Greater Poland |
| ITS Poland Sp. z o.o. | |
| ITTI Sp. z o.o. | Greater Poland |
| ITX | |
| Ivendo Connect | Warmian-Masurian |
| iVhosting | Greater Poland |
| IVN | |
| Iware Sp. z o.o. | |
| iWeb.pl | Kuyavian-Pomeranian |
| IXION Sp. z o.o. | Silesian |
| IZACOM Sp. z o.o. | Greater Poland |
| J-Labs | |
| JackSEO Sp. z o.o. | |
| Jakusz SpaceTech Ltd | |
| 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 |
| JavaStart | Lower Silesian |
| JAWO-Projekt Sp. z o.o. | Masovian |
| Jazzy Innovations Sp. z o.o. | |
| JBR | Silesian |
| JCD | |
| JCHost.pl | Lesser Poland |
| JCommerce Sp. z o.o. | Silesian |
| Jednostki Innowacyjno-Wdrożeniowe Profile Sp. z o.o. | Lower Silesian |
| JetStyle | Lesser Poland |
| Jetstyle Sp. z o.o. | Lesser Poland |
| Jezierski.IT | Lesser Poland |
| JJP Biologics | |
| JM elektronik Sp. z o.o. | Silesian |
| JMC, LLC | Masovian |
| JMK Computer Sp. z o.o. | Masovian |
| JMMJ | Masovian |
| JMR | |
| Jobroad s.c. | |
| Jobs.pl S.A. | |
| John Weston Group | |
| JohnCube Sp. z o.o. | |