| Bee the Data, S.L. | Barcelona |
| Beedata Analytics, S.L. | Barcelona |
| Beedigital | |
| BeeDIGITAL AI, S.A.U. | Madrid |
| Beemeral, S.L. | Málaga |
| Begoñako Andra Mari Irakasleen Unibertsitate Eskola | |
| Beleader Internet Marketing, S.L. | Madrid |
| Belsati Sistemas | Barcelona |
| Belvo | Barcelona |
| Benotac | Madrid |
| BEOFFON | |
| BEONx | Salamanca |
| BEONx | |
| Berba Translations, S.L. | Biscay |
| BeRepublic Networks, S.L. | Barcelona |
| Berkano Systems | Madrid |
| Berrly | Barcelona |
| Berzerk | |
| Best In BI Solutions, S.L. | |
| Best Marketing | Madrid |
| Best Search Consultores, S.L. | Madrid |
| BETA Mayorista Informático, S. L. | Zaragoza |
| Betran.info | Barcelona |
| Betterplace | Asturias |
| beWanted | Madrid |
| beWanted | |
| BGS Software y Control Industrial, S.L. | Barcelona |
| Biboss | Barcelona |
| Bic Araba | Álava |
| Bic Gipuzkoa | Gipuzkoa |
| Biel Glasses, S.L. | Barcelona |
| Big Sur Ventures | Madrid |
| Bigle Legal | Barcelona |
| BIGSEO | |
| Biguntek | Gipuzkoa |
| Biko2 2006, S.L. | Madrid |
| Bilnea Digital, S.L. | Murcia |
| BIM Informàtica, S.L. | Barcelona |
| Binaria Web Services, S.L. | Barcelona |
| Binary Systems | Santa Cruz de Tenerife |
| Bincore Servicios Informáticos | Madrid |
| Binsoft | Barcelona |
| Bio-One, S.L. | Barcelona |
| Bioaccez | Barcelona |
| BioBam Bioinformatics | Valencia |
| Biocat | Barcelona |
| BioClonal | |
| Biofabri, S.L.U. | |
| Bioga | |
| Bioiberica | Barcelona |