- ODTX — Odyssey Therapeutics, Inc.
- ODY.AX — Odyssey Gold Limited
- ODYC — Odyne Corporation
- ODYS — Odysight.ai Inc.
- ODYY — Odyssey Health, Inc.
- OEC — Orion Engineered Carbons S.A.
- OEC.AX — Orbital Corporation Limited
- OECPF — Oracle Energy Corp.
- OEDVQ — Osage Exploration and Development, Inc.
- OEF — iShares SP 100 ETF
- OEFA — ALPS Funds O’Shares International Developed Quality Dividend ETF
- OEI — Optimized Equity Income ETF
- OEL.AX — Otto Energy Limited
- OERCF — Österreichische Post AG
- OERLF — OC Oerlikon Corporation AG
- OESX — Orion Energy Systems, Inc.
- OEZVF — Verbund AG
- OEZVY — Verbund AG
- OFAL — OFA Group
- OFED — Oconee Federal Financial Corp.
- OFG — OFG Bancorp
- OFIX — Orthofix Medical Inc.
- OFLX — Omega Flex, Inc.
- OFRM — Once Upon A Farm Pbc
- OFS — OFS Capital Corporation
- OFSI — Omni Financial Services, Inc.
- OFSSH — OFS Capital Corporation 4.95% Notes due 2028
- OFSTF — Carbon Streaming Corporation
- OFX.AX — OFX Group Limited
- OGAA — Organic Agricultural Company Limited
- OGBLY — Onion Global Limited
- OGC — OceanaGold Corporation
- OGC.TO — OceanaGold Corporation
- OGCP — Empire State Realty OP, L.P.
- OGD.TO — Orbit Garant Drilling Inc.
- OGE — OGE Energy Corp.
- OGEN — Oragenics, Inc.
- OGFGF — Origin Energy Limited
- OGFGY — Origin Energy Limited
- OGG — Osisko Gold Group Inc.
- OGG.V — Osisko Gold Group Inc.
- OGGFF — Oragin Foods Inc.
- OGGNF — Origen Resources Inc.
- OGGWZ — Osisko Gold Group Inc.
- OGI — Organigram Global Inc.
- OGI.TO — OrganiGram Holdings Inc.
- OGIG — ALPS Funds O’Shares Global Internet Giants ETF
- OGN — Organon & Co.
- OGN.V — Orogen Royalties Inc.
- OGO.V — Organto Foods Inc.
- OGOFF — Organto Foods Inc.
- OGS — ONE Gas, Inc.
- OGSP — Obra High Grade Structured Products ETF
- OHAC — Oceanhawk Acquisition Corp. Class A Ordinary Shares
- OHACR — Oceanhawk Acquisition Corp. Rights
- OHAQ — Oracle Healthcare Acquisition Corp.
- OHCS — Optimus Healthcare Services, Inc.
- OHI — Omega Healthcare Investors, Inc.
- OHTR — Oasis Hotel Resort & Casino I
- OI — O-I Glass, Inc.
- OIBRQ — Oi S.A.
- OIBZQ — Oi S.A.
- OICT — Oicintra, Inc.
- OIGLF — Chariot Limited
- OIH — VanEck Oil Services ETF
- OII — Oceaneering International, Inc.
- OIL.AX — Optiscan Imaging Limited
- OILCF — Permex Petroleum Corporation
- OILD — MicroSectors Oil & Gas Exp. & Prod. -3x Inverse Leveraged ETN
- OILFF — Nextleaf Solutions Ltd.
- OILK — ProShares - K-1 Free Crude Oil ETF
- OILRF — Oil Refineries Ltd.
- OILS.CN — Nextleaf Solutions Ltd.
- OILSF — Saturn Oil & Gas Inc.
- OILT — Texas Capital Texas Oil Index ETF
- OILU — MicroSectors Oil & Gas Exp. & Prod. 3x Leveraged ETN
- OIM — OneIM Acquisition Corp. Class A Ordinary Shares
- OIMAU — Oneim Acquisition Corp.
- OIO — OIO Group
- OIOWW — OIO Group
- OIS — Oil States International, Inc.
- OISXF — Oisix ra daichi Inc.
- OITAF — The Oita Bank, Ltd.
- OJIPF — Oji Holdings Corporation
- OJIPY — Oji Holdings Corporation
- OJOC — Ojai Oil Company
- OJSY — OJsys, Inc.
- OKAMF — Okamura Corporation
- OKCTF — Okinawa Cellular Telephone Company
- OKE — ONEOK, Inc.
- OKEPF — The Okinawa Electric Power Company, Incorporated
- OKIEF — Oki Electric Industry Co., Ltd.
- OKIEY — Oki Electric Industry Co., Ltd.
- OKJ.AX — Oakajee Corporation Ltd
- OKLL — Daily Target 2X Long OKLO ETF
- OKLO — Oklo Inc.
- OKMN — Okmin Resources, Inc.
- OKTA — Okta, Inc.
- OKTG — Leverage Shares 2x Long OKTA Daily ETF
- OKUR — OnKure Therapeutics, Inc.
