| Ocoee Technologies | Tennessee |
| Oconee Fall Line Technical College | Georgia |
| Oconee Federal Savings and Loan Association | |
| Ocoos Web Consulting | |
| Ocosa Communications, LLC | Oklahoma |
| Ocozzio | Georgia |
| OCP Group, Inc. | California |
| OCP Tech | Florida |
| OCR Solutions, Inc. | Vermont |
| OCR.best | |
| OCS Hosting & Domain Services | Delaware |
| OCS Networks, Inc. | Wisconsin |
| OCS Solutions, Inc. | Alabama |
| Octadyne Systems, Inc. | |
| Octagon | |
| Octagon Communication, Inc. | New Jersey |
| Octagon Therapeutics | |
| Octal Digital | |
| Octal Digital | |
| Octal Info Solution Pvt Ltd | Florida |
| Octane | |
| Octane Advertising | California |
| Octane AI | California |
| Octane Lending | |
| Octane Marketing | |
| Octane Public Relations and Advertising | |
| Octane Technologies | Washington |
| Octane Wireless | Maryland |
| Octane11, Inc. | New York |
| Octane5 International, LLC | |
| Octant | California |
| Octava, Inc. | Georgia |
| Octave Bioscience | California |
| Octave Design | |
| Octaware | Washington |
| Octet Design Solutions, Inc. | |
| Octet IT Solutions | |
| Octify Technologies | |
| October Hill Software | California |
| OctoCog | Massachusetts |
| Octolane AI, Inc. | |
| Octolis | |
| Octomind, Inc. | |
| OctoML | Washington |
| Octoon Technologies | |
| Octoparse | California |
| Octopart, Inc. | New York |
| Octopi Digital, LLC | |
| Octopus Advertising Group | |
| Ocugen, Inc. | Pennsylvania |