| OEC | Orion S.A. Common Shares | | |
| OFG | OFG Bancorp Common Stock | | |
| OFRM | Once Upon a Farm, PBC Common Stock | | |
| OGC | OceanaGold Corporation Common Shares | | |
| OGE | OGE Energy Corp Common Stock | | |
| OGG | Osisko Gold Group Inc. Common Shares | | |
| OGN | Organon & Co. Common Stock | | |
| OGS | ONE Gas, Inc. Common Stock | | |
| OHI | Omega Healthcare Investors, Inc. Common Stock | | |
| OI | O-I Glass, Inc. Common Stock | | |
| OIA | Invesco Municipal Income Opportunities Trust Common Stock | | |
| OII | Oceaneering International, Inc. Common Stock | | |
| OIS | Oil States International, Inc. Common Stock | | |
| OKE | ONEOK, Inc. Common Stock | | SP500 |
| OKLO | Oklo Inc. Class A common stock | | |
| OLN | Olin Corporation Common Stock | | |
| OLP | One Liberty Properties, Inc. Common Stock | | |
| OMC | Omnicom Group Inc. Common Stock | | SP500 |
| OMF | OneMain Holdings, Inc. Common Stock | | |
| ONIT | Onity Group Inc. Common Stock | | |
| ONL | Orion Properties Inc. Common Stock | | |
| ONON | On Holding AG Class A Ordinary Shares | | |
| ONT | Onterris, Inc. Common Stock | | |
| ONTO | Onto Innovation Inc. Common Stock | | |
| OOMA | Ooma, Inc. Common Stock | | |
| OPFI | OppFi Inc. Class A Common Stock | | |
| OPLN | OPENLANE, Inc. Common Stock | | |
| OPP | RiverNorth/DoubleLine Strategic Opportunity Fund, Inc. Common Stock | | |
| OPP-A | RiverNorth/DoubleLine Strategic Opportunity Fund, Inc. 4.375% Series A Cumulative Preferred Stock | | |
| OPP-B | RiverNorth/DoubleLine Strategic Opportunity Fund, Inc. 4.75% Series B Cumulative Preferred Stock | | |
| OPTU | Optimum Communications, Inc. Class A common stock | | |
| OPY | Oppenheimer Holdings, Inc. Class A Common Stock (DE) | | |
| OR | OR Royalties Inc. Common Shares | | |
| ORA | Ormat Technologies, Inc. Common Stock | | |
| ORC | Orchid Island Capital, Inc. Common Stock | | |
| ORCL | Oracle Corporation Common Stock | | SP500 |
| ORCL-D | Oracle Corporation Depositary Shares, each representing a 1/2,000th interest in a sh of 6.50% Series D Mandatory Convertible Preferred Stock | | |
| ORI | Old Republic International Corporation Common Stock | | |
| ORN | Orion Group Holdings, Inc. Common | | |
| OSCR | Oscar Health, Inc. Class A Common Stock | | |
| OSG | Octave Specialty Group, Inc. Common Stock | | |
| OSK | Oshkosh Corporation (Holding Company)Common Stock | | |
| OTAI | Starlink AI Acquisition Corporation Ordinary Shares | | |
| OTAI^ | Starlink AI Acquisition Corporation Rights, each entitling the holder to receive one-fourth (1/4) of one ordinary share | | |
| OTAI= | Starlink AI Acquisition Corporation Units, each consisting of one Ordinary Share, and one Right to receive one-fourth (1/4) of one ordinary share | | |
| OTF | Blue Owl Technology Finance Corp. Common Stock | | |
| OTIS | Otis Worldwide Corporation Common Stock | | SP500 |
| OUT | OUTFRONT Media Inc. Common Stock | | |
| OVV | Ovintiv Inc. (DE) | | |
| OWL | Blue Owl Capital Inc. Class A Common Stock | | |