| Patreider S.r.l. | Belluno |
| PC Academy S.r.l. | Rome |
| PCE Italia S.r.l. | Lucca |
| PCG S.r.l. | Rome |
| PCSoftware | Bari |
| PCUsato.it | Parma |
| Pecso Cavi S.r.l. | Mantua |
| Pedius S.r.l. | |
| Pellegrini S.p.A. | Venice |
| Pellegrini Telecomunicazioni S.r.l. | Milan |
| Pensareweb | Rimini |
| Penta Elettronica S.a.s. | Biella |
| Penta S.r.l. | Treviso |
| Personae | Turin |
| Pess S.r.l. | Asti |
| PGE S.r.l. | Rieti |
| Phasis | Rome |
| Philogen S.p.A. | |
| Phoneconsulting S.a.s. | Reggio Emilia |
| Phononic Vibes S.r.l. | |
| phpDay | Verona |
| PhraseExpander | Turin |
| Pi School | |
| Pianeta Software | Lecce |
| Pick Center Roma S.r.l. | Rome |
| Picosats S.r.l. | |
| Piemme Telecom S.r.l. | Bergamo |
| Pikkart S.r.l. | |
| Pimas S.r.l. | Padua |
| PinCell S.r.l. | |
| Pino Ceniccola | Bologna |
| PINV S.r.l. | |
| PipeIn S.r.l. | |
| Pivotal | Parma |
| Pixel Web Development | Ravenna |
| Pixies | Rome |
| Pizzoni Modern Office S.r.l. | Milan |
| Pizzut | Latina |
| PlanBee S.r.l. | |
| Planckian | |
| Planet Consulting S.r.l. | Milan |
| PlaNet S.r.l. Sistemi Informatici | Florence |
| Planetek Italia S.r.l. | |
| Planetel S.p.A. | Brescia |
| Plannet | Reggio Emilia |
| Plasfer S.r.l. | |
| Playnet S.r.l. | |
| PLC Forum | Monza and Brianza |
| Plume S.r.l. | |
| Plus Biomedicals S.r.l. | |