| ORIO | Orion Digital Corp. | Technology | $24.5M | — | 0 |
| OESX | Orion Energy Systems, Inc. | Industrials | $119M | — | 0 |
| ORN | Orion Group Holdings, Inc. | Industrials | $345M | — | 0 |
| ONL | Orion Properties Inc. | Real Estate | $143M | — | 0 |
| OEC | Orion S.A. | Basic Materials | $339M | — | 0 |
| ORXCF | ORIX Corporation | Financial Services | $41.9B | — | 0 |
| ORA | Ormat Technologies, Inc. | Utilities | $5.7B | — | 0 |
| ORRCF | Oroco Resource Corp. | Basic Materials | $112M | — | 0 |
| ORRF | Orrstown Financial Services, Inc. | Financial Services | $822M | — | 0 |
| OFIX | Orthofix Medical Inc. | Healthcare | $370M | — | 0 |
| KIDS | OrthoPediatrics Corp. | Healthcare | $582M | — | 0 |
| ORKA | Oruka Therapeutics, Inc. | Healthcare | $5.2B | — | 0 |
| OSTX | OS Therapies Incorporated | Healthcare | $75.6M | — | 0 |
| OSCR | Oscar Health, Inc. | Healthcare | $7.5B | — | 0 |
| OSK | Oshkosh Corp | Industrials | $8.0B | — | 0 |
| OSIS | OSI Systems, Inc. | Technology | $3.3B | — | 0 |
| OSDVF | Osisko Gold Group Inc. | — | — | — | 0 |
| OSOPF | Osotspa Public Company Limited | Consumer Defensive | $2.4M | — | 0 |
| OSPRU | Osprey Acquisition Corp. III | — | — | — | 0 |
| OBTC | Osprey Bitcoin Trust | — | — | — | 0 |
| OBNB | Osprey BNB Chain Trust | — | — | — | 0 |
| OBNK | Osprey BONK Trust | Financial Services | $9.9M | — | 0 |
| OSOL | Osprey Solana Trust | — | — | — | 0 |
| OSRHW | OSR Holdings, Inc. | Healthcare | $0.7M | — | 0 |
| OST | Ostin Technology Group Co., Ltd. | Technology | $10.1M | — | 0 |