Politics and Business magazines
- Penn Traffic Company
- Pennon Group Plc
- Pennsylvania Blue Shield
- Pennsylvania Power & Light Company
- Pennwalt Corporation
- PennWell Corporation
- Pennzoil-Quaker State Company
- Pentax Corporation
- Pentech International, Inc.
- Pentland Group plc
- Penton Media, Inc.
- Penzeys Spices, Inc.
- People Express Airlines, Inc.
- Peoples Energy Corporation
- Peopperidge Farm, Incorporated
- Pepper Hamilton LLP
- PepsiAmericas, Inc.
- Perdigao SA
- Perfetti Van Melle S.p.A.
- Performance Food Group Company