| Company | Booth | |
| Chainbridge Technologies | 329 | |
| Chloeta | 224 | |
| CK Associates | 525 | |
| Clean Earth Systems, Inc. | 218 | |
| Clean Gulf Associates | 301 | |
| Clean Harbors | 319 | |
| Cliff Berry, Inc. | 330 | |
| Coastal Response Research Center | 725 | |
| Cotton Logistics | 601 | |
| CRUCIAL, INC. | 610 | |
| CSA Ocean Sciences Inc. | 210 | |
| CTEH, LLC. | 407 | |