| Alltrim Sp. z o.o. | Greater Poland |
| ALM Services Technology Group | |
| Alma S.A. | |
| Almar IT Sp.z.o.o Sp. K. | Silesian |
| Alnet Systems Sp. z o.o. | Pomeranian |
| Alphamoon Sp. z o.o. | Lower Silesian |
| AlphaNet Sp. z o.o. | Silesian |
| ALSO | Greater Poland |
| Altab.pl | Silesian |
| Alte Media | Pomeranian |
| Alterdata.io Sp. z o.o. | |
| Alterkom Sp. z o.o. | Lesser Poland |
| Altimi | |
| Altix | Masovian |
| Altkom Software | |
| Altkomp | Lesser Poland |
| ALTRAN | Masovian |
| ALX | Masovian |
| AMAGE Systems Sp. z o.o. | |
| Amano | |
| AMB Software Sp. z o.o. | Masovian |
| Ambiscale Sp. z o.o. | |
| AMC Tech Sp. z o.o. | |
| AMEplus Sp. z o.o. | Silesian |
| American Systems | |
| Amikom S.C. | Podlaskie |
| Amiserwis | Masovian |
| AMM Robot | |
| AMSNET | Lower Silesian |
| amSoft | |
| AMT Solution | |
| Anchor Software Sp. z o.o. | Greater Poland |
| Anchor Sp. z o.o. | Masovian |
| And Computers | Lesser Poland |
| Android.com.pl | Masovian |
| ANDRZEJEWSKI Automatyzacja i Wyposażenie Produkcji Sp. z o.o. | Łódź |
| Angry Nerd | |
| Angry Nerds | |
| Anixe | |
| Anscom - szkolenia pakietu Office | Pomeranian |
| Anshar Studios S.A | |
| ANT Sp. z o.o. | |
| Antologic | Lower Silesian |
| Antyweb Sp. z o.o. | |
| aOrion | |
| Apanet S.A. | |
| Apeiron Synthesis | |
| Apel | |
| APER Ventures Sp. z o.o. | |
| ApiTrade | Masovian |