| Company | Location |
|---|---|
| Chipworks Inc. | Ottawa, Ontario, Canada |
| Chiral Photonics Inc. | Clifton, New Jersey, United States |
| Chiral Technologies | Exton, Pennsylvania, United States |
| Chisholm Institute | Dandenong, Victoria, Australia |
| Chorum Technologies | Richardson, Texas, United States |
| Christmann GmbH | Birkenfeld, Germany |
| Ciba Specialty Chemicals North America | Tarrytown, New York, United States |
| CiDRA Precision Services | Wallingford, Connecticut, United States |
| CIENA Corp. | Linthicum, Maryland, United States |
| CILAS | ORLEANS, France |
