- Penn United Technology, Inc.
- Pennknoll Village
- Pennsville National Bank
- Pennswood Village
- Pennsylvania Academy of Family Physicians
- Pennsylvania Alliance for Association Advancement
- Pennsylvania Association of Community Bankers
- Pennsylvania Association of Community Health Centers
- Pennsylvania Automotive Association
- Pennsylvania Convention Center Authority
- Pennsylvania Department of Health
- Pennsylvania Dutch Convention and Visitors Bureau
- Pennsylvania Hospital - Penn Medicine
- Pennsylvania Music Educators Association
- Pennsylvania Psychiatric Institute
- Penobscot Valley Hospital
- Penrose - St. Francis Health Services
- Pension Benefit Guaranty Corporation
- Pentech Pharmaceuticals, Inc.
- Penton Media, Inc.
- People To People International
- People, Inc.
- Peoples Community Health Care
- Peoples Income Tax, Inc.
- PeopleSoft
- Peoria Area CVB
- Pepperidge Farm, Inc
- Peppermill
- Pepsi Americas
- Pepsi Bottling Company
- Pepsi Cola Bottling Co.
- Pepsi Cola Bottling Group
- Pepsi-Cola National Brand Beverages
- PepsiCo
- PERC
- Perfect Settings
- Perfection Oil Co.
- Performance Events
- Performance Trailers
- Peripheral SVCS Inc
- Perishable Distributors of Iowa
- Perishing County Board of Commissioners
- Perkins County
- Perkins Eastman Architects PC of New York
- Perkins Eastman Architects PC of Pennsylvania
- Perkins Electronics
- Perkins Restaurant
- Perma
- Perot Systems Corporation
- Perotsystems