| Company | Location |
|---|---|
| Oak Ridge National Laboratory | Oak Ridge, Tennessee, United States |
| Obducat AB | Malmo, Sweden |
| OC Oerlikon Balzers AG | Balzers, Liechtenstein |
| Ocean Optics | Dunedin, Florida, United States |
| Ocean Optics Inc. | Dunedin, Florida, United States |
| OCG Ventures LLC | Columbia, Maryland, United States |
| OEpic Inc. | Sunnyvale, California, United States |
| Ohio State University - MicroMD Laboratory | Columbus, Ohio, United States |
| Ohio State University - Nanotech Research Tribology | Columbus, Ohio, United States |
| OI Analytical | College Station, Texas, United States |
