- Packaging Corporation of America
- Packard BioScience Company
- PacketVideo Corporation
- PaeTec Corp.
- Pain Therapeutics Inc.
- Palm, Inc.
- PaperExchange.com, Inc.
- Paradigm Genetics, Inc.
- Paradigm4, Inc.
- Parthus Technologies Public Limited Company
- Participate.com, Inc.
- PartMiner, Inc.
- PartsBase.com, Inc.
- Paymap, Inc.
- PayTru$t, Inc.
- PDF Solutions, Inc.
- PEC Solutions, Inc.
- Peco II, Inc.
- Pemstar Inc.
- Penson Worldwide Inc.
- PeoplePC, Inc.
- Peoples Community Bancorp, Inc.
- Personify, Inc.
- Petopia.com, Inc.
- PetroChina Company Limited
- Pets.com, Inc.
- PETsMART.com, Inc.
- Pharsight Corporation
- Phase2Media, Inc.
- Pinnacle Financial Partners, Inc.
- Pixelworks, Inc.
- PlaceWare, Inc.
- Playboy.com, Inc.
- Plumtree Software, Inc.
- PNY Technologies, Inc.
- Pointshare Corporation
- Port Financial Corp.
- Power Save International, Inc.
- Power Save International, Inc.
- POZEN, Inc.
- Praecis Pharmaceuticals Incorporated
- Precis Smart Card Systems, Inc.
- Precise Software Solutions Ltd.
- Prime Response, Inc.
- Primis, Inc.
- Princeton Review, Inc. The
- PrintCafe, Inc.
- ProcureNet, Inc.
- Propel, Inc.
- Protocol Communications, Inc.
- Proton Energy Systems, Inc.
- PYA/Monarch, Inc.
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