| Company | Location |
|---|---|
| CTRL Systems Inc. | Westminster, Maryland, United States |
| Cube Optics AG | Mainz, Germany |
| Current Concepts LLC | Watertown, Wisconsin, United States |
| Curt Deckert Assoc. Inc. | Santa Ana, California, United States |
| Custom Control Sensors (CCS) | Chatsworth, California, United States |
| CVD Equipment Corporation | Central Islip, New York, United States |
| CVD Systems & Services Inc. | Phoenixville, Pennsylvania, United States |
| CVI Melles Griot | Carlsbad, California, United States |
| Cyanagen S.r.l. | Bologna, Italy |
| Cybernet Systems Corp. | Ann Arbor, Michigan, United States |
