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| Company Name | Tel | Country/Region | Contact |
| OMEGACHEM INC. | 418 837-4444 | Canada | |
| Orthodox Union | 1-212-5634000 | United States | |
| Oxxides, Inc. | 845 238 5142 | United States | |
| Optimachem | 912-384-5101 | United States | |
| Omicron Biochemicals, Inc. | 574 287 6910 | United States | |
| Organix Inc. | 781 932 4142 | United States | |
| Ochem Incorporation | 847 596 0856 | United States |