| Orange Dimension | Lisbon |
| Oreyeon | |
| Origen Studio | |
| Oursupport | Azores |
| Out.Cloud | Lisbon |
| Outdare | |
| Outplanr | |
| OutSoft | Região de Aveiro |
| P2T | Lisbon |
| Pahldata | Lisbon |
| Papersoft | Lisbon |
| Parallel-Processing | |
| Parkurbis | Beiras e Serra da Estrela |
| Particle Forward, Lda | |
| Passworks | Lisbon |
| Paycritical | Lisbon |
| Pcmedic | Beiras e Serra da Estrela |
| PeakIT | |
| Pecland Engenharia Informática, Lda | Lisbon |
| PeekMed | |
| PeopleWare | Lisbon |
| PETE.tech | |
| Petronilho, Magalhães e Ramalhete, Lda | Lisbon |
| PH Informática e Micro Sistemas, S.A. | Porto |
| Phantasma Chain | Lisbon |
| PHC GO | Lisbon |
| PHC Software | Lisbon |
| Phi Wallet Unipersonal, Lda | |
| Photoshop Star | Lisbon |
| Physics of Information and Quantum Technologies Group | |
| PICadvanced | |
| PipeCodes | Alentejo Central |
| Pixel in Motion | |
| Pixelmatters | Porto |
| PixelStudio | Região de Coimbra |
| Planless | Lisbon |
| PlatformE | Porto |
| Play your future, S.A. | Lisbon |
| Player | Porto |
| PLD - Distribuição Informática, Lda | Porto |
| Pleez | Lisbon |
| Podsqueeze | Lisbon |
| Politécnico de Portalegre | |
| Politécnico de Viseu | Viseu Dão Lafões |
| Porbite, Lda | Lisbon |
| Porto Innovation Hub | Porto |
| Porto Research, Technology & Innovation Center | Porto |
| Porto Tech Hub | Porto |
| Portugal Fintech | Lisbon |
| Portugal Startups | Lisbon |