| Pledge Therapeutics | |
| Plego | |
| Plenadata | Utah |
| Plenful | |
| Pleno, Inc. | California |
| PlenOptika | |
| Plentina Financial, Inc. | California |
| Plenty | California |
| Plenty Unlimited, Inc. | |
| PleoPharma, Inc. | |
| Plestar, Inc. | |
| Pleth, LLC | |
| Plethora Design | District of Columbia |
| Plex DemandCaster | Michigan |
| Plex Pharmaceuticals, Inc. | |
| Plexar Associates, Inc. | Ohio |
| Plexera, LLC | Washington |
| PLEXIS Healthcare Systems, Inc. | Oregon |
| Plexision | Pennsylvania |
| Plexium, Inc. | California |
| PlexObject Solutions, Inc. | Illinois |
| Plexon, Inc. | Texas |
| Plexos Group, LLC | |
| Plexsys Interface Products, Inc. | Washington |
| PlexTrac, Inc. | Idaho |
| Plexum Corporation | Illinois |
| Plexus IT | California |
| Plimoth Investment Advisors | |
| Pliner Solutions, Inc. | Pennsylvania |
| Plink, Inc. | California |
| Plivo, Inc. | California |
| Plixer International, Inc. | Maine |
| Plnar | Texas |
| Ploomber | New York |
| Ploonu | |
| Plot | New York |
| Plotkin Software, LLC | Massachusetts |
| Plotline, Inc. | |
| Ploto, Inc. | |
| Plotter Repair Atlanta | Georgia |
| Plotworks, Inc. | California |
| Plover Animation | |
| Plow Digital | |
| PloxHost | Massachusetts |
| PLT4M | |
| Plucky | |
| Plug and Play Tech Center | California |
| Plug Digital | Michigan |
| Plug-n-Play PC, Inc. | Massachusetts |
| PlugXR, Inc. | California |