| sup_enName | Tel | CountryRegion | Contact |
| OMEGACHEM INC. | 418 837-4444 | CA | |
| Orthodox Union | 1-212-5634000 | US | |
| Oxxides, Inc. | 845 238 5142 | US | |
| Optimachem | 912-384-5101 | US | |
| Omicron Biochemicals, Inc. | 574 287 6910 | US | |
| Organix Inc. | 781 932 4142 | US | |
| Ochem Incorporation | 847 596 0856 | US |