| Company | Booth | |
| C&K INDUSTRIAL SERVICES INC. | 332 | |
| Calgon Carbon Corporation | 813 | |
| Canalplast SPA | 553 | |
| CATSI,Inc. | 803 | |
| CCC Group, Inc. | 204 | |
| Century Elevators, Inc | 108 | |
| CFM/VR-TESCO, LLC | 436 | |
| CHART Inc. | 442 | |
| Chromalox | 700 | |
| Clayton Industries | 530 | |
| Clean Harbors | 437 | |
| ClearSpan Fabric Structures | 110 | |
| CleaverBrooks Inc. | 612 | |
| CO2 Capture Project | 525 | |
| Coast to Coast Coatings | 552 | |
| Company Wrench | 740 | |
| Cooling Technology Institute (CTI) | 650 | |
| Cooling Tower Technologies Inc | 536 | |
| Corrosion Service Company Limited | 237 | |
| Crosslink Technology, Inc. | 801 | |
| CTLGroup | 703 | |
