- P & F Industries Incorporated
- PACCAR Incorporated
- Pacific Ethanol Incorporated
- Pacific Financial Company
- Pacific Gas & Electric Company
- Pacific National Corporation
- Pacific Sunwear of California Incorporated
- PacifiCorp
- Packaging Corporation of America
- Pactiv Corporation
- PainCare Holdings Incorporated
- Pall Corporation
- Palm Harbor Homes Incorporated
- Palm Inc
- Panavision Incorporated
- Panera Bread Company
- Pantry Incorporated (The)
- Park Electrochemical
- Park National Corporation
- Parker Hannifin Corporation
- Parkway Bank
- Pathmark Stores Incorporated
- Paxson Communications Corporation
- Paychex Incorporated
- Peabody Energy Corporation
- Peace Frogs
- Peco Energy Company
- Pediatrix Medical Group Incorporated
- Penn National Gaming
- Penn Treaty American Corporation
- Penn Virginia Corporation
- Pennsylvania Power Company
- Pentair Incorporated
- Penton Media Incorporated
- People's Bank
- Peoples Energy Corporation
- PepsiCo Incorporated
- Perini Corporation
- Pernod Ricard SA
- Perrigo Company
- Perry Ellis International Incorporated
- PetroChina Company Limited
- Petroleo Brasileiro SA
- Petroleum & Resources Corporation
- Pfizer Incorporated
- PG&E Corporation
- Phelps Dodge Corporation
- Philips Electronics
- Phillips-Van Heusen Corporation
- Phoenix Companies Incorporated
- Photronics Incorporated
- Pier 1 Imports Incorporated
- Pike Electric Corporation
- Pinelawn Cemetery
- Pinnacle Airlines Corporation
- Pinnacle Entertainment Incorporated
- Pitney Bowes Incorporated
- Pixar
- PlanetOut Incorporated
- Plantronics Incorporated
- Plaxo Inc.
- Playboy Enterprises, Inc.
- Plug Power Incorporated
- Plum Creek Timber Company Incorporated
- PNC Financial Services Group Incorporated
- Polk Audio Incorporated
- Polo Ralph Lauren Corporation
- Polycom Incorporated
- Porsche AG
- Portland General Electric Company
- Potash Corporation of Saskatchewan Incorporated
- Potomac Electric Power Company
- PPL Corporation
- PPR
- Praxair Incorporated
- Precision Castparts Corporation
- Premier Exhibitions
- priceline.com Incorporated
- Pride International Incorporated
- Prime Retail Incorporated
- Primedia Incorporated
- Princeton Review Inc.
- Principal Financial Group Incorporated
- Private Business Incorporated
- PrivateBancorp Incorporated
- Procter & Gamble Company
- Procyon Corporation
- Proginet Corporation
- Progress Energy Incorporated
- Progressive Corporation
- Prologue
- ProQuest Company
- Provident Bankshares Corporation
- Prudential Financial Incorporated
- PSA Peugeot Citroen
- PSINet Incorporated
- Psychiatric Solutions Incorporated
- Public Service Electric & Gas Company
- Public Service Enterprise Group Incorporated
- Public Storage Incorporated
- Publicis Groupe SA
- Publix Super Markets Incorporated