| ATGames | |
| Athenasoft | Masovian |
| ATI | Masovian |
| Atkom | Silesian |
| ATOMIUM Systemy Informatyczne | Masovian |
| Atrium-PC.pl | Greater Poland |
| Atryda | West Pomeranian |
| ATS | Masovian |
| Atteli Sp. z o.o. | Masovian |
| AttHost | |
| Audio Academy | Łódź |
| Aula Polska | |
| Aurelius Interactive | Masovian |
| Autenti | Lesser Poland |
| Authlogic Sp. z o.o. | |
| AutoID Polska S.A. | |
| Automade | |
| AutoMapa.pl | Masovian |
| Automater | |
| Autonomous Systems | |
| Avatarland Sp. z o.o. | |
| Averbit | |
| Avidin Ltd | |
| AVSystem | |
| Awacom | Kuyavian-Pomeranian |
| Axed Serwis S.C. | Greater Poland |
| Axel Computer Sp. z o.o. | Pomeranian |
| AXIS Sp. z o.o. | Masovian |
| Axium Sp. z o.o. sp.k. | Masovian |
| Axora | |
| Aye Aye Labs Ltd | |
| AZ.pl | West Pomeranian |
| B&P "SYSTEM" s.c. | Warmian-Masurian |
| B-MIND Sp. z o.o. | |
| B.I. Solutions | Masovian |
| B2B Sp. z o.o. | Lesser Poland |
| B2Net Systems Sp. z o.o. | Greater Poland |
| Badel Elektronik Sp. z o.o. | Lower Silesian |
| Bagstudios | |
| BAJT S.C. | Warmian-Masurian |
| Bakk Sp. z o.o. | Masovian |
| Balt Media | Pomeranian |
| BaltRobotics Sp. z o.o. | |
| Bank BPH S.A. | |
| Bank Gospodarstwa Krajowego | |
| Bank Handlowy w Warszawie S.A. | Masovian |
| Bank Millennium S.A. | Masovian |
| Bank Ochrony Środowiska S.A. | Masovian |
| Bank Pekao S.A. | Masovian |
| Bank Pocztowy S.A. | |