| APIUS Technologies S.A. | |
| Aplinet | |
| Aplitt Sp. z o.o. | |
| APN Promise S.A. | Masovian |
| Apollo Sp. z o.o. | Subcarpathian |
| Apollogic Sp. z o.o. | |
| App.js Conf | |
| App.Tailors | |
| Appchance | Greater Poland |
| AppCodes | Masovian |
| AppDistrict Sp. z o.o. | |
| Appfinity | |
| Appfleet | |
| Apphawks | Greater Poland |
| Appidea | |
| Appjet.io | |
| Applandeo Sp. z o.o. | |
| Applica | |
| Appliscale Sp. z o.o. | Lesser Poland |
| Appotype Ltd | |
| Appricotsoft | |
| Appsilon Sp. z o.o. | |
| APPSTRACT | |
| Appstronauts Sp. z o.o. | |
| Apptension | |
| Apptorium | |
| Appunite S.A. | |
| AppVerk Sp. z o.o. | |
| Appvinio | |
| Appwise | |
| AppWorks Software | |
| APR System | Świętokrzyskie |
| Apreel | |
| Aptus.pl | Silesian |
| Apzumi | Greater Poland |
| Ar-range.app | |
| Arahub Sp. z o.o. | |
| ARC Consulting | |
| ARC Software | |
| Arcabit Sp. z o.o. | Masovian |
| ARCUS S.A. | Masovian |
| Arcus Systemy Informatyczne Sp. z o.o. | Lublin |
| ArdentCode | |
| ARDURA Consulting Sp. z o.o. Sp. k. | |
| Aret | Greater Poland |
| Arkacom | Masovian |
| Arkency | |
| Arkonsoft | |
| Aron Code | |
| ARP Ideas | |