| Call Tools | California |
| Call2Kitchen | |
| Call2Recycle, Inc. | Georgia |
| Call48.com | Florida |
| Callan Pharma Services | |
| Callback Technologies, Inc. | North Carolina |
| Callbox, Inc. | |
| Callcentric, Inc. | New York |
| Calldrip | Utah |
| Callecs.net | Georgia |
| CallerID.com | Georgia |
| CallFire, Inc. | California |
| CallFluent AI | |
| CallHippo | |
| CallHUb | |
| Callibra, Inc. | Illinois |
| Callify.ai | New York |
| Callingly, LLC | Arizona |
| Callingmart | Texas |
| Callio Therapeutics | |
| Calliope Concepts, LLC | |
| CallMiner | Massachusetts |
| CallMultiplier.com | Oklahoma |
| CallNet Call Center Services | Indiana |
| CallOnTheGo.com | |
| CallRevu, LLC | Maryland |
| CallSource | |
| CallTele, Inc. | Illinois |
| CallTrackingMetrics, LLC | Maryland |
| Calltrol Corporation | New York |
| Callware Technologies, Inc. | Utah |
| Calm Energy, Inc. | |
| Calmont Wire & Cable, Inc. | California |
| Calmotion, LLC | |
| CalmWave, Inc. | |
| Calnet, Inc. | Virginia |
| Calogic, LLC | California |
| Calosyn Pharma, Inc. | |
| Calrad, Inc. | California |
| Calsoft Systems | California |
| Calspan | |
| Caltek USA | California |
| CalTel | California |
| CalTower, Inc. | California |
| Caltron Industrial, Inc. | California |
| Caltronics | California |
| Calumet Capital, LLC | Florida |
| Calumet College of St. Joseph | Indiana |
| Calumet, Inc. | |
| Calvary University | Missouri |