| Plum | California |
| Plum Alley Co. | New York |
| Plum Creek Consulting | Wisconsin |
| Plumaz, LLC | |
| Plumb Development | New Hampshire |
| Plumb Pharmaceuticals, Inc. | |
| Plumbing Webmasters | |
| Plume Design, Inc. | |
| Plummer Slade, Inc. | Pennsylvania |
| Plumsail | Florida |
| Plunk, Inc. | |
| Plural Policy, Inc. | |
| Pluralis Research | |
| Pluralsight, LLC | Utah |
| Plurexa | |
| Pluribus Networks, Inc. | California |
| Pluristyx | Washington |
| PluroTech, LLC | Illinois |
| Plus & Minus Software Corporation | Texas |
| Plus Consulting, LLC | Pennsylvania |
| Plus Docs, Inc. | Washington |
| Plus One Robotics | Texas |
| Plus Technologies, LLC | Ohio |
| Plus Therapeutics, Inc. | |
| Plus11 | |
| PlusAI, Inc. | |
| Plush Marketing Agency | |
| PlusPlus Internet Solutions, LLC | Delaware |
| Plustek | California |
| Pluto Biosciences | Colorado |
| Plutora, Inc. | California |
| PLX Labs, LLC | |
| PLx Pharma, Inc. | |
| PLYmedia | New York |
| Plymouth Rocket, Inc. | Massachusetts |
| Plymouth State University Computer Science and Technology | New Hampshire |
| Plymouth State University Mathematics | New Hampshire |
| Plymouth Ventures | Michigan |
| Plynt, Inc. | Virginia |
| Plytix.com, Inc. | Delaware |
| PM AM Corporation | Texas |
| PM Assembly, L.P. | Texas |
| PM Connect | California |
| PM Digital Consulting, LLC | Florida |
| PM Photo & Computer Services | Nevada |
| PMA Advertising, Inc. | |
| PMA Financial Network, LLC | |
| PMC, Inc. | Illinois |
| PMCS Services | Texas |
| pMDsoft, Inc. | California |