- PICTY860
- PICTY900
- PICTY960
- PIER Systems
- Pierre Jaquet-Droz
- Pierre Morad Omidyar
- Pierre Omidyar
- Pierre Omidyar
- PIEtech, Inc
- Pieter Van den Abeele
- PikeOS
- Pikpok
- Pilat Media
- Pilgrim Software
- Pillar Data Systems
- Pillar Technology Group, LLC
- Pindar
- PineApp
- Pingsta
- Pinnacle Systems
- Pinscher Designs, LLC
- Pinto-TH
- Pioneer
- Pioneer LaserActive
- Pioneer Palcom PX-7
- PipelineDeals
- Piqora Inc.
- Piranha Games Inc
- Pirate Bay, pirates of the modern virtual world
- Piriform
- PistonSoft
- Pitney Bowes, Inc.
- PITSS America LLC
- Pivot3
- Pivotal Labs
- Pivotal Software, Inc. (GoPivotal)
- PivotPoint Technology Corporation
- Pixafy, Inc.
- Pixalate, Inc.
- Pixart
- Pixel Web Solutions
- Pixela Corporation
- Pixelmator Mac
- Pixlr
- Pixologic
- Pixologic ZBrush
- PJ S2130
- PJ Technologies
- PJ WX2130
- PJ WX3131
- PJ WX3231N
- PJ WX4130
- PJ WX4130N
- PJ WX5140
- PJ WX5150
- PJ WX5350N
- PJ X2130
- PJ X2130
- PJ X3131
- PJ X3241
- PJ X3241N
- PJ X5260
- PJ X5360N
- PKWARE
- PKWARE Inc.
- Pkware PKUNZIP
- Pkware PKZIP
- PlacePunch
- PlaceWare
- Plan 9
- Plan B Technologies
- Planar Systems
- Planet Internet Services
- PlanetUp
- PlanIT Hardware
- PlanRight Software
- Plantronics
- Plants vs. Zombies
- Planview
- Plat'Home
- Plateau Systems
- Platform Computing Corporation
- Platform Logic
- Plathome Co Ltd
- Platinum Safety Systems
- Platinum Technology
- Plato History
- PLATO Learning, Inc.
- Platte River Networks
- PlayMaker CRM
- Playnet Technologies Inc
- Playstos Entertainment
- Playtech
- Playtech Australia
- Playtech Telesport
- Pleiades Supercomputer
- Plenium Service Informatique
- Plex Systems