| Company | Location |
|---|---|
| Computer Optics Inc. | Hudson, New Hampshire, United States |
| COMSOL, Inc. | Burlington, Massachusetts, United States |
| Conant Engineering | Berkeley, California, United States |
| Concentris | Basel, Switzerland |
| Concurrent Technologies Corp. | Johnstown, Pennsylvania, United States |
| Constellation Technology Corp. | Largo, Florida, United States |
| Continuum Photonics Inc. | Billerica, Massachusetts, United States |
| ConverTec Corp. | Newtown, Pennsylvania, United States |
| Conway & Silver, Energy Associates LLC dba LED Consulting | Nassau, New York, United States |
| Cool Chips plc | Gibraltar, Spain |
