| Abbreviation | Definition |
|---|---|
| ORV | Orvana Minerals Corp. |
| ORV | Orvana Minerals Corporation |
| OSF | Oil Sands Sector Fund |
| OSI | OSI Geospatial Inc. |
| OSI | OSI Geospatial Incorporated (de-listed) |
| OSI | OSI Geospatial Incorporated (de-listed) |
| OSK | Osisko Mining Corporation |
| OSL | OCP Senior Credit Fund |
| OSM | Oil Sands and Energy Mega-Projects Trust |
| OSU | Orsu Metals Corporation |
| OTC | Open Text Corporation |
| OTT | Otelco Inc. |
| OTT | Otelco Incorporated (de-listed) |
| OTT | Otelco Incorporated (de-listed) |
| OYM | Olympus Pacific Minerals Inc. |
| OYM | Olympus Pacific Minerals Incorporated (de-listed) |
| OYM | Olympus Pacific Minerals Incorporated (de-listed) |
| P | Primero Mining Corp. |
| P | Primero Mining Corporation |
| PAA | Pan American Silver Corp. |