| Company | Sector | Market Cap |
|---|---|---|
| OAK | Healthcare | $2.2M |
| OB1 | Basic Materials | $3.5M |
| OBL | Financial Services | $489.5M |
| OBM | Basic Materials | $2.13B |
| OCA | Healthcare | $420.1M |
| OCC | Healthcare | $163.2M |
| OCL | Technology | $1.04B |
| OCN | Basic Materials | $98.6M |
| OCT | Basic Materials | $1.8M |
| OD6 | Basic Materials | $18.5M |
| ODA | Industrials | $7.9M |
| ODE | Basic Materials | $38.8M |
| ODY | Basic Materials | $33.7M |
| OEC | Industrials | $20.2M |
| OEL | Energy | $26.4M |
| OFX | Financial Services | $130.9M |
| OIL | Technology | $130.5M |
| OLI | Consumer Cyclical | $3.2M |
| OLL | Technology | $7.8M |
| OLY | Basic Materials | $4.0M |
| OM1 | Basic Materials | $3.9M |
| OMA | Energy | $235.1M |
| OMG | Consumer Defensive | $6.6M |
| OMH | Basic Materials | $179.6M |
| OML | Communication Services | $726.3M |
| OMX | Basic Materials | $7.9M |
| ONE | Healthcare | $149.6M |
| OOO | ETF | $91.6M |
| OPH | Fund | $607.7M |
| OR3 | Basic Materials | $66.2M |
| ORA | Consumer Cyclical | $1.69B |
| ORD | Basic Materials | $29.1M |
| ORE | Basic Materials | $1.28B |
| ORG | Energy | $19.09B |
| ORI | Basic Materials | $10.74B |
| ORN | Basic Materials | $197.0M |
| ORP | Basic Materials | $19.3M |
| OSL | Healthcare | $10.6M |
| OSM | Basic Materials | $75.9M |
| OSX | Healthcare | $1.3M |
| OVT | Technology | $4.7M |
| OZF | ETF | $44.9M |
| OZM | Basic Materials | $17.7M |
| OZR | ETF | $258.8M |
