| Black Pants Game Studio | Hesse |
| Black Semiconductor | |
| Blackbit digital Commerce GmbH | |
| Blackcam 4D GmbH | |
| Blackemon Büro für Mediengestaltung | Rhineland-Palatinate |
| blaich IT GmbH | |
| Blank | Bavaria |
| Blank & Nassauer GmbH | |
| Blauhut & Partner Informationssysteme GmbH | Bavaria |
| BlauWeb.DE | Brandenburg |
| Blech GmbH | Berlin |
| Blecher Networld GmbH | Bavaria |
| Blenk Software | Bavaria |
| Blickfeld GmbH | Bavaria |
| Blickle & Scherer Kommunikationstechnik GmbH & Co. KG | Baden-Württemberg |
| Blickshift GmbH | |
| Blindside HB GmbH | |
| blinkenbox eG | |
| Blinkenlichten Open Source Solutions | Berlin |
| BlinkIn GmbH | |
| Blinkist | |
| Bliq | |
| Bliq | |
| Blish GmbH | |
| bll computersysteme GmbH & Co. KG | Baden-Württemberg |
| Blloc GmbH | |
| BLMEDiA GmbH | North Rhine-Westphalia |
| Blockbrain GmbH | |
| Blockchain Hackathon | Baden-Württemberg |
| Blockchain Helix AG | Hesse |
| Blockchain HELIX AG | |
| Blockchain Holding GmbH | |
| Blockchain Research Lab gGmbH | |
| blockLAB Stuttgart e.V. | |
| Blockrocket GmbH | |
| Blocksize | |
| Blocksize Capital | |
| Blockwall Management GmbH | Hesse |
| blogfoster GmbH | Berlin |
| Blohm Consulting GmbH | Schleswig-Holstein |
| Bloofusion Germany GmbH | North Rhine-Westphalia |
| Bloola GmbH & Co. KG | |
| Bloomblisser GmbH | |
| blösch.partner GmbH | |
| BLP Software GmbH | Baden-Württemberg |
| Blubbsoft GmbH | |
| Blue Ant | |
| Blue Ball Media | North Rhine-Westphalia |
| Blue Image GmbH | Baden-Württemberg |
| Blue Label Soft | Mecklenburg-Vorpommern |