| Boss Computers | Lesser Poland |
| Bouncer | |
| Bowil Biotech Sp. z o.o. | |
| BOWWE | |
| BPSC | Silesian |
| BPX S.A. | Lower Silesian |
| BrainCode Marketing | |
| Brainhub Sp. z o.o. | Silesian |
| Brainly | |
| Brainly.pl | |
| Brand Oriented Sp. z o.o. | |
| Brand24 | |
| Brandrocket Digital | |
| Brave New | |
| Bravelab | |
| Bright Apps Sp. z o.o. | |
| Bright Future | Masovian |
| Bright Inventions | |
| Brights | |
| Britenet | |
| Brival Sp. z o.o. | |
| Brodex | Lubusz |
| Brontes Processing Sp. z o.o. | Silesian |
| BrowseWiz | |
| bs4 business solutions Sp. z o.o. | Greater Poland |
| BSN Biersin | Lower Silesian |
| bsscommunication.com | Masovian |
| BST | Silesian |
| BTC Sp. z o.o. | West Pomeranian |
| Buddy Team Sp. z o.o. | Masovian |
| Build IT Up Sp. z o.o. | |
| Buisness Insider Polska | |
| Bull Design | Masovian |
| Bunker Studio | Masovian |
| Bürkert Contromatic GmbH | Masovian |
| Buro S.C. | Masovian |
| Business Lab Nowy Świat s.c. | |
| Business Web Solutions | |
| Busy Beaver Software | |
| Busy Rebel | |
| BUTORG Sp. z o.o. | Lower Silesian |
| Buttercups | |
| bValue Fund | |
| Bydgoska Szkoła Wyższa | |
| Byss Mobile | |
| ByteGeometry | |
| byteLAKE | |
| BytesBakers Sp. z o.o. | |
| ByVoice Sp. z o.o. | |
| C&C Partners Telecom Sp. z o.o. | Greater Poland |