| Check Gateway, LLC | Arizona |
| Check Point User Group | California |
| CheckAlt, Inc. | California |
| Checkbook | California |
| Checkbox Survey, Inc. | Massachusetts |
| CheckerBoard | Minnesota |
| Checkly, Inc. | |
| Checkmagic | New Hampshire |
| CheckMark | Colorado |
| Checkmarx | Colorado |
| Checkmarx Ltd | |
| Checkmate Productions | Utah |
| Checkpoint Surgical, Inc. | Ohio |
| Checkpoint Systems, Inc. | New Jersey |
| Checkpoint Therapeutics, Inc. | |
| Checkr | California |
| Checks by Fax Software Company | Arizona |
| Checkster | California |
| CheckSum, LLC | Washington |
| CheckWriter | Massachusetts |
| Cheehoo | |
| Cheekd, Inc. | |
| Cheeney Media Concepts | |
| Cheenti Digital, LLC | |
| Cheetah Digital | Illinois |
| Cheetah Logistic Technology | California |
| Chef Robotics, Inc. | California |
| Chef Software, Inc. | Washington |
| Chegg, Inc. | |
| Cheil Worldwide, Inc. | |
| Chekable, Inc. | |
| Chekhub | North Carolina |
| Chelsea Technologies | New York |
| Chelsio Communications | California |
| Chelsoft Solutions Co. | Kansas |
| Chemapps | California |
| Chematix | Georgia |
| Chembio Diagnostic, Inc. | New York |
| Chembridge Corporation | California |
| ChemDBSoft.com | Delaware |
| ChemDiv | California |
| CheMedImmune, Inc. | |
| Chemeleon | |
| Chemical and Pharmaceutical Solutions, Inc. | New Jersey |
| ChemInnovation Software, Inc. | California |
| CheminPharma | |
| Chemitope Glycopeptide | New York |
| Chemogenics BioPharma | |
| Chemours | |
| ChemPacific Corporation | |