| Optio3, Inc. | Washington |
| Option Alpha | |
| Option Technologies International, LLC | Florida |
| Option4 Interactive Solutions | Florida |
| OptionGrid | Colorado |
| Options Information Technology, LLC | New York |
| Optios, Inc. | California |
| OptioSurgical | Colorado |
| Optise | |
| OptiSol Business Solutions | |
| Optisys, Inc. | |
| Optitek, Inc. | Missouri |
| OptiTrack | |
| Optiv Security, Inc. | Colorado |
| OptiView 360 Tours, LLC | Florida |
| Optivision, Inc. | Arizona |
| OptiWorks, Inc. | California |
| Optix Communications, Inc. | California |
| Optizmo Technologies, LLC | Texas |
| Optm | Florida |
| OptMed, Inc. | |
| OPTML | |
| Opto 22 | California |
| Opto Diode Corporation | California |
| Opto-Knowledge Systems, Inc. | California |
| Optocom Corporation | Florida |
| Optodot Corporation | Massachusetts |
| Optoelectronics, Inc. | Georgia |
| OptoElectronix, Inc. | California |
| Optoma Technology, Inc. | California |
| Optomi, LLC | Georgia |
| Optoro, Inc. | District of Columbia |
| OptoTest Corporation | California |
| Optotherm, Inc. | Pennsylvania |
| OptoTree, LLC | |
| OptraHEALTH, Inc. | California |
| OptraSCAN, Inc. | |
| OptTek Systems, Inc. | Colorado |
| Optum Ventures | Massachusetts |
| Optum, Inc. | |
| Optus, Inc. | Arkansas |
| Optys Tech Corporation | |
| OPUA Agency | |
| Opulus | Pennsylvania |
| Opus Biosciences, Inc. | |
| Opus Capital | California |
| Opus Consulting | Georgia |
| Opus Design | |
| Opus Genetics, Inc. | North Carolina |
| Opus Interactive | Oregon |