- ONCR — Oncorus, Inc.
- ONCS — OncoSec Medical Incorporated
- ONCT — Oncternal Therapeutics, Inc.
- ONCY — Oncolytics Biotech Inc.
- OND — ProShares - On-Demand ETF
- ONDR — Sushi Ginza Onodera, Inc.
- ONDS — Ondas Holdings Inc.
- ONE — Meta Data Limited
- ONE.V — 01 Quantum Inc.
- ONEB.TO — CI North American Core Plus Bond ETF
- ONEG — OneConstruction Group Limited
- ONEM — 1Life Healthcare, Inc.
- ONEO — State Street SPDR Russell 1000 Momentum Focus ETF
- ONEQ — FIDELITY NASDAQ COMPOSITE INDEX ETF
- ONEQ.TO — CI Global Core Plus Equity ETF
- ONEV — State Street SPDR Russell 1000 Low Volatility Focus ETF
- ONEW — OneWater Marine Inc.
- ONEX.TO — Onex Corporation
- ONEY — State Street SPDR Russell 1000 Yield Focus ETF
- ONFO — Onfolio Holdings, Inc.
- ONFOW — Onfolio Holdings, Inc.
- ONIT — Onity Group Inc.
- ONL — Orion Properties Inc.
- ONLN — ProShares - Online Retail ETF
- ONMD — OneMedNet Corporation
- ONMDW — OneMedNet Corporation
- ONOF — Global X - Adaptive U.S. Risk Management ETF
- ONON — On Holding AG
- ONT — Onterris, Inc.
- ONTF — ON24, Inc.
- ONTO — Onto Innovation Inc.
- ONTXW — Onconova Therapeutics Inc. Warrants
- ONVI — Onvia, Inc.
- ONVO — Organovo Holdings, Inc.
- ONYX — Onyx Acquisition Co. I
- ONYXU — Onyx Acquisition Co. I
- ONYXW — Onyx Acquisition Co. I
- OOMA — Ooma, Inc.
- OOOO.V — OOOOO Entertainment Commerce Limited
- OOQB — One One Nasdaq-100 and Bitcoin ETF 1Shs
- OOSB — One One S&P 500 and Bitcoin ETF
- OOSP — Obra Opportunistic Structured Products ETF
- OOTO — Direxion Daily Travel & Vacation Bull 2X Shares
- OP — OceanPal Inc.
- OPA — Magnum Opus Acquisition Limited
- OPA-UN — Magnum Opus Acquisition Limited
- OPAD — Offerpad Solutions Inc.
- OPAL — OPAL Fuels Inc.
- OPALW — OPAL Fuels Inc.
- OPBK — OP Bancorp
- OPCH — Option Care Health, Inc.
- OPEG — Leverage Shares 2x Long OPEN Daily ETF
- OPEN — Opendoor Technologies Inc.
- OPER — ClearShares Ultra-Short Maturity ETF
- OPFI — OppFi Inc.
- OPGIX — Invesco Global Opportunities A
- OPHC — OptimumBank Holdings, Inc.
- OPHR.V — Ophir Gold Corp.
- OPI — Office Properties Income Trust
- OPINL — Office Properties Income Trust
- OPK — OPKO Health, Inc.
- OPLN — OPENLANE Inc. Common Stock
- OPMIX — Invesco Main Street Mid Cap R6
- OPNT — Opiant Pharmaceuticals, Inc.
- OPOF — Old Point Financial Corporation
- OPP — RiverNorth/DoubleLine Strategic Opportunity Fund, Inc.
- OPPE — WisdomTree European Opportunities Fund
- OPPG — WisdomTree GeoAlpha Opportunities Fund
- OPPJ — WisdomTree Japan Opportunities Fund
- OPPX — Corbett Road Tactical Opportunity ETF
- OPRA — Opera Limited
- OPRT — Oportun Financial Corporation
- OPRX — OptimizeRx Corporation
- OPS.TO — Opsens Inc.
- OPT — Opthea Limited
- OPT.TO — Optiva Inc.
- OPTH — Optimi Health Corp.
- OPTN — OptiNose, Inc.
- OPTT — Ocean Power Technologies, Inc.
- OPTU — Optimum Communications, Inc.
- OPTX — Syntec Optics Holdings, Inc.
- OPTXW — Syntec Optics Holdings, Inc.
- OPTZ — Optimize Strategy Index ETF
- OPV.V — Optimum Ventures Ltd.
- OPW.V — Opawica Explorations Inc.
- OPXS — Optex Systems Holdings, Inc
- OPY — Oppenheimer Holdings Inc.
- OR — OR Royalties Inc.
- OR.TO — OR Royalties Inc.
- ORA — Ormat Technologies, Inc.
- ORA.TO — Aura Minerals Inc.
- ORAN — Orange S.A.
- ORBC — ORBCOMM Inc.
- ORBS — Eightco Holdings Inc.
- ORBX — Global X Space Tech ETF
- ORC — Orchid Island Capital, Inc.
- ORC-B.V — Orca Energy Group Inc.
- ORCC — Owl Rock Capital Corporation
- ORCL — Oracle Corporation
- ORCS — Direxion Daily ORCL Bear 1X ETF
