| Bautechnik Limburg | — | — | Hadamar | Germany |
| Bauunternehmen Weißbrich | info@bauunternehmen-weissbrich.de | — | Braunschweig | Germany |
| Bauunternehmung Hildebrandt GmbH | — | +49224281864 | Hennef | Germany |
| BayWa | — | — | München | Germany |
| Bayer & Raach Neue Energien GmbH & Co. KG | kristoph.koenig@bayer-raach.de | +49 7388 993373 | Pfronstetten-Aichelau | Germany |
| Bayer AG | — | — | Leverkusen | Germany |
| Bayerische Theaterakademie August Everding | — | — | — | |
| Bayerischer Rundfunk | — | — | München | Germany |
| Bayern-Fass | — | +49 8251 88990 | Aichach | Germany |
| Bayern-Mail | — | — | — | |
| BayernInvest LU | — | — | Munsbach | Luxembourg |
| Bbg-Energiekonzepte | — | — | — | |
| BechTec power GmbH | — | — | Ettlingen | Germany |
| BechTec power GmbH | — | — | Chemnitz | Germany |
| Beesandbears | — | — | — | |
| Behringer Eisele GmbH | — | — | Weilheim an der Teck | Germany |
| Beilharz Haus GmbH | — | — | Vöhringen | Germany |
| Beispielangebot | — | — | — | |
| Belenus GmbH | — | 49772099040 | — | Germany |
| Belgaspot | — | +320499345800 | Haccourt | |
| Bellersheim Tankstellen Gmbh & Co.KG | — | — | Neitersen | Germany |
| Benecke Tiefbau GmbH | benecke-tiefbaugmbh@t-online.de | +49 (391) 631 23 67 | Magdeburg (Ottersleben) | Germany |
| Benedikt Veranstaltungstechnik | — | +4903524265545 | Nossen | Germany |
| Bennex | — | — | Velsen-Noord | |
| Beobachter | — | — | Zürich | Switzerland |