| BitHouse | Lesser Poland |
| Bitnet Sp. z o.o. | |
| Bitnoise | |
| Bitspiration Booster Sp. z o.o. | |
| Biurco | |
| Biurcoo | |
| Biuro Hello | |
| Biuro Usług Informatycznych Softel S.C. | Warmian-Masurian |
| Biuro56 | |
| Biurolandia | |
| BIVROST Sp. z o.o. | |
| Bizky | |
| Bizmedia.pl Sp. z o.o. | Silesian |
| Biznes Spot Sp. z o.o. | |
| BiznesHub Sp. z o.o. | |
| BizTech Konsulting S.A. | |
| Black Pearls VC | Pomeranian |
| Blanet.pl | Greater Poland |
| Blare Technologies Sp. z o.o. | |
| Blast.pl | Lesser Poland |
| blaster.pl | Łódź |
| Blasto | |
| Blazity | |
| BLDG Venture | Lesser Poland |
| Blees Sp. z o.o. | |
| BLIM.pl | Pomeranian |
| Bling SH | |
| BLIRT S.A. | |
| Blocklabs | |
| Bloober Team, Inc. | Lesser Poland |
| Blox.pl | Masovian |
| Blue Dot Solutions Sp. z o.o. | |
| Blue House Technologies Sp. z o.o. | Masovian |
| Bluecloud Interactive | |
| Bluerank Sp. z o.o. | Łódź |
| Bluerider.Software | |
| Blues Brackets Sp. z o.o. | |
| Bluesoft Sp. z o.o. | |
| BlueWave.IT Consulting Sp. z o.o. | |
| BMJ Sp. J. | Silesian |
| BMS Sp. z o.o. | Masovian |
| BOBO Coworking | |
| Bogumił Kamiński | |
| BOK SferaNET S.A. | |
| Boldare S.A. | |
| BOO.pl | Silesian |
| BoomBit | Pomeranian |
| Booste S.A. | |
| Boostsite Sp. z o.o. | |
| Boring Owl Sp. z o.o. | |