| Bercella S.r.l. | |
| Beretta S.r.l. | Monza and Brianza |
| Berger+Team | |
| BestNetwork | Rome |
| Beta Elettronica S.r.l. | Bergamo |
| BetaGlue Technologies S.p.A. | |
| BeTeck Soc. Coop. | South Sardinia |
| Bett Sistemi S.r.l. | Reggio Emilia |
| BEV | Milan |
| Beyond The Box S.r.l. | Milan |
| BFT S.p.A. | Vicenza |
| BG SAXO SIM S.p.A. | |
| BHW Bausparkasse AG | |
| Bi Elle S.r.l. | Turin |
| BI Network | |
| BI@Work S.r.l. | Friuli-Venezia Giulia |
| Bieffedue Elettronica S.r.l. | Parma |
| Biella Linux User Group | Biella |
| BIELLE S.a.s. | Rome |
| Biesse S.p.A. | |
| BigProfiles | Rome |
| BIMaking Engineering | |
| Bio4Dreams S.p.A. | |
| BioClec S.r.l. | |
| Biocode Bioinformatics | Rome |
| Biofarma S.r.l. | |
| Biogenera S.p.A. | |
| Bioindustry Park Silvano Fumero S.p.A. | Turin |
| BIOMAS S.r.l. | Bologna |
| Biometric S.r.l. | Turin |
| Biometrika S.r.l. | Forlì-Cesena |
| BiOMViS S.r.l. | |
| Bios Elettronica S.r.l. | Rome |
| BiovelocITA S.r.l. | |
| Biovitae | |
| Bisognin | Vicenza |
| Bit2win S.r.l. | |
| Bit4id S.r.l. | |
| BitBang | Bologna |
| BitBoss S.r.l. | |
| Bitnet S.r.l. | Rome |
| BitSong S.r.l. | |
| Bix Servizi Web Marketing S.r.l.s. | Rome |
| BizAway S.r.l. | Milan |
| bizConsulting S.r.l. | Cagliari |
| BL Digital | |
| BL Sistemi | Rome |
| Blacksheep S.r.l. | |
| Blallo | |
| Blendee S.r.l. | |