| Accelpoint | |
| Accesto | |
| Acclaim Dawid Stasiak | Łódź |
| ACE! Conference | |
| ACEE Europe Sp. z.o.o. | Masovian |
| Achromatic Sp. z o.o. | |
| Acnet Sp. z o.o. | Masovian |
| Acquitec | Lower Silesian |
| ACR Systems | |
| Acrebit Sp. z o.o. | |
| ACSS ID Systems Sp. z o.o. | Greater Poland |
| Active Design | Masovian |
| Active.pl | Łódź |
| ActivePC | Lesser Poland |
| Actualizer | Masovian |
| Acutus.Digital | |
| Adalytica | |
| Adamed | |
| Adaptive Applications Sp. z o.o. | |
| Adaptronica Sp. z o.o. | |
| ADASO | Masovian |
| Adchitecs | Greater Poland |
| ADD | Masovian |
| ADD-COM | Subcarpathian |
| Addepto Sp. z o.o. | |
| Adee-Soft Usługi komputerowe | Silesian |
| Adhdev SDN Sp. z o.o. sp. k. | |
| AdMans | |
| ADSpectra.pl | |
| Adtogame | |
| ADTV Sp. z o.o. | Masovian |
| AdvaCom | Greater Poland |
| Advanced Internet Concepts | Masovian |
| Advanced Protection Systems S.A. | |
| Advantue | |
| Advox Sp. z o.o. | |
| Advy.ai | |
| Aerobits Sp. z o.o. | |
| Aether Biomedical | |
| Aexol Sp. z o.o. | |
| AF SEKO Sp. z o.o. | Silesian |
| AF.agency | |
| Affee360 | |
| Afterburn | |
| AGBIT Computer Systems | Masovian |
| Agencja E-commerce E-direct | Opole |
| Agencja Interaktywna Epoka | Lesser Poland |
| Agencja Interaktywna WiWi | Podlaskie |
| Agencja Rozwoju Pomorza S.A. | |
| Agencja SEO SEMPIRE Europe Sp. z o.o. | |