| OnMobile Global Limited (ONMOBILE) NSE - National Stock Exchange of India | |
| Oriental Trimex Limited (ORIENTALTL) NSE - National Stock Exchange of India | |
| Oriental Hotels Limited (ORIENTHOT) NSE - National Stock Exchange of India | |
| Orient Press Ltd (ORIENTLTD) NSE - National Stock Exchange of India | |
| Odyssey Marine Exploration Inc (OMEX) NASDAQ - National Association of Securities Dealers Automated Quotations | |
| Omeros Corporation (OMER) NASDAQ - National Association of Securities Dealers Automated Quotations | |
| Open Text Corp (USA) (OTEX) NASDAQ - National Association of Securities Dealers Automated Quotations | |
| Opus Bank (OPB) NASDAQ - National Association of Securities Dealers Automated Quotations | |
| Oxford Lane Capital Corp (OXLC) NASDAQ - National Association of Securities Dealers Automated Quotations | |
| OGE Energy Corp. (OGE) NYSE - The New York Stock Exchange | |
| Orange SA (ADR) (ORAN) NYSE - The New York Stock Exchange | |
| Orion Engineered Carbons SA (OEC) NYSE - The New York Stock Exchange | |
| Ormat Technologies, Inc. (ORA) NYSE - The New York Stock Exchange | |
| Owens Corning (OC) NYSE - The New York Stock Exchange | |
| Owens-Illinois Inc (OI) NYSE - The New York Stock Exchange | |