| USB | U.S. Bancorp | 40.45 | Financial Services | Stocks | NYQ |
| OB | Outbrain Inc. | 4.09 | Communication Services | Stocks | NMS |
| MSB | Mesabi Trust | 17.79 | Basic Materials | Stocks | NYQ |
| ASB | Associated Banc-Corp | 20.55 | Financial Services | Stocks | NYQ |
| OSK | Oshkosh Corporation (Holding Co | 117.72 | Industrials | Stocks | NYQ |
| SB | Safe Bulkers, Inc | 4.81 | Industrials | Stocks | NYQ |
| ONB | Old National Bancorp | 16.19 | Financial Services | Stocks | NMS |
| OPB | OPB | N/A | N/A | Stocks | NMS |
| OSS | One Stop Systems, Inc. | 2.78 | Technology | Stocks | NCM |
| ZSB | ZSB | 25.33 | N/A | Stocks | ASE |
| OSBC | Old Second Bancorp, Inc. | 14.43 | Financial Services | Stocks | NMS |
| SSB | SouthState Corporation | 78.33 | Financial Services | Stocks | NYQ |
| OSG | Overseas Shipholding Group, Inc | 5.98 | Energy | Stocks | NYQ |
| OSW | OneSpaWorld Holdings Limited | 12.30 | Consumer Cyclical | Stocks | NCM |
| OST | Ostin Technology Group Co., Ltd | 0.41 | Technology | Stocks | NCM |
| OVB | OVB | 25.21 | N/A | Stocks | NYQ |
| OSA | ProSomnus, Inc. | 0.47 | Healthcare | Stocks | NGM |
| OSB.L | OSB GROUP PLC ORD 1P | 379.40 | Financial Services | Stocks | LSE |
| OLB | The OLB Group, Inc. | 0.33 | Technology | Stocks | NCM |
| 0P0001M081.L | UWS CT American A - OSB | 731.82 | N/A | Mutual Fund | LSE |
| 0P0001M073.L | UWS Property A - OSB | 97.80 | N/A | Mutual Fund | LSE |
| OSBL.XC | OSB Group PLC | 380.20 | Financial Services | Stocks | CXE |
| OSI | Osiris Acquisition Corp. | 10.71 | Financial Services | Stocks | NYQ |
| OSBK | OCONEE FINL CORP | 33.75 | Financial Services | Stocks | PNK |
| 2UK.F | OSB GROUP PLC LS 0,01 | 4.34 | Financial Services | Stocks | FRA |