| Personal PC Repair | New Hampshire |
| Personal Remedies, LLC | |
| Personal Satellite Network, Inc. | Virginia |
| Personal SEO | |
| Personalis, Inc. | California |
| Personality Web Designs | Florida |
| Personalized Computers | Missouri |
| Personalized Software, Inc. | Oregon |
| Personalized Stem Cells, Inc. | California |
| Personalweb | Texas |
| Personaweb, Inc. | California |
| Personetics Technologies Ltd | New York |
| Personify, Inc. | Texas |
| Personnel Data Systems, Inc. | Pennsylvania |
| Perspectium | California |
| Perspective Edge | |
| Perspective Therapeutics | |
| Perspectus Tech | Colorado |
| Perssist, Inc. | |
| Persuasive Games, LLC | Georgia |
| Persys Medical | North Carolina |
| Persystence Holdings, LLC | New Hampshire |
| Pertech Industries, Inc. | Wyoming |
| Perth Digital Agency | |
| Perthera, Inc. | Virginia |
| Pertinacious Software | New York |
| Peru State College Computer Management Information Systems | Nebraska |
| Peruse Software, Inc. | New Hampshire |
| Pervasent Software, Inc. | California |
| PESA Switching Systems, Inc. | Alabama |
| Pestka Biomedical Laboratories, Inc. | New Jersey |
| Pesto Tech | California |
| PestPac Software | New Jersey |
| PET Imaging Institute of South Florida | Florida |
| Pet Web Designer | Tennessee |
| Petabridge, LLC | Texas |
| Petabyte | Washington |
| Petal Card, Inc. | |
| Petal Solutions, Inc. | |
| Petal Surgical | |
| Petal Technology, LLC | |
| PetDesk | California |
| Pete Maclean Communications Software | Virginia |
| Pete's Post Digital Marketing | |
| Peter Biotherapeutics | |
| Peter Paul Office Equipment | Ohio |
| Peteramayer | |
| Peterson Design Group | Texas |
| Peterson Institute for International Economics | |
| Peterson Ventures | Utah |