| Participatory Culture Foundation | Massachusetts |
| Particle Health, Inc. | New York |
| Particle Industries, Inc. | California |
| Particle Measuring Systems, Inc. | |
| Particle Sciences | Pennsylvania |
| Particula | |
| Particular Software, Inc. | |
| Partillion Bioscience Corporation | California |
| Partner Software | Georgia |
| Partner Systems | Arizona |
| Partner Therapeutics, Inc. | |
| PartnerComm, Inc. | |
| Partnerize | California |
| PartnerOptimizer, Inc. | California |
| Partners Credit & Verification Solutions | |
| Partners Data Systems, Inc. | California |
| Partners in Digital Health | Connecticut |
| Partners in Local Search | |
| Partners Remarketing, Inc. | California |
| Partnership on AI | California |
| Partnership Web Apps Marketing | |
| Parts Connect, Inc. | |
| Parts Detect, LLC | |
| Parts Detect, LLC | |
| Parts-People.com, Inc. | Texas |
| Partshere | California |
| PartSimple Technologies, LLC | |
| PartSmart Corporation | Georgia |
| Partstack | California |
| Partstat | Florida |
| Party Track | Maine |
| Parus Holdings, Inc. | Texas |
| Parvus Therapeutics, Inc. | |
| Parwan Electronics Corporation | New Jersey |
| PAS, Inc. | Florida |
| Pasadena Angels | California |
| Pasadena City College | California |
| Pasadena Networks, LLC | California |
| Pascack Data Services, Inc. | New Jersey |
| Pascal AI | |
| Pascal Software | California |
| Pasco-Hernando State College | Florida |
| Pashtek | |
| Pasithea Therapeutics | |
| Paspartoo, LLC | |
| Pasquesi Partners, LLC | |
| PASS Data Community Summit | Illinois |
| Pass The Hat | |
| Passage | Texas |
| Passage Bio, Inc. | Pennsylvania |