- OHACU — Oceanhawk Acquisition Corp
- OHI — Omega Healthcare Investors, Inc.
- OHPA — Orion Acquisition Corp.
- OHPAU — Orion Acquisition Corp.
- OHPAW — Orion Acquisition Corp.
- OI — O-I Glass, Inc.
- OIA — Invesco Municipal Income Opportunities Trust
- OIBR-C — Oi S.A.
- OIEIX — JPMorgan Equity Income A
- OIEJX — JPMorgan Equity Income Fund Class R6
- OIFIX — Optimum Fixed Income Fund
- OIG — Orbital Infrastructure Group, Inc.
- OIGIX — Invesco Oppenheimer International Gr R6
- OIH — VanEck Oil Services ETF
- OII — Oceaneering International, Inc.
- OIIEX — Optimum International Fund Institutional Class
- OIII.V — O3 Mining Inc.
- OIIL — Credit Suisse X-Links WTI Crude Oil Index ETN
- OIIM — O2Micro International Limited
- OIL — iPath Pure Beta Crude Oil ETN
- OILD — MicroSectors Oil & Gas Exp. & Prod. -3x Inverse Leveraged ETN
- OILGX — Optimum Large Cap Growth Fund
- OILT — Texas Capital Texas Oil Index ETF
- OILU — MicroSectors Oil & Gas Exp. & Prod. 3x Leveraged ETN
- OILVX — Optimum Large Cap Value Fund Class I
- OILX — UBS ETRACS S&P GSCI Crude Oil Total Return Index ETN
- OIM — OneIM Acquisition Corp. Class A Ordinary Shares
- OIMAU — Oneim Acquisition Corp.
- OIMAW — OneIM Acquisition Corp. Warrant
- OIO — OIO Group
- OIOWW — OIO Group
- OIS — Oil States International, Inc.
- OISGX — Optimum Small Cap Growth Fund Class I
- OISVX — Optimum Small-Mid Cap Value Fund
- OKE — ONEOK, Inc.
- OKLL — Daily Target 2X Long OKLO ETF
- OKLO — Oklo Inc.
- OKSB — Southwest Bancorp, Inc.
- OKTA — Okta, Inc.
- OKTG — Leverage Shares 2x Long OKTA Daily ETF
- OKUR — OnKure Therapeutics, Inc.
- OKYO — OKYO Pharma Limited
- OLA.TO — Orla Mining Ltd.
- OLB — The OLB Group, Inc.
- OLD — The Long-Term Care ETF
- OLED — Universal Display Corporation
- OLEM — iPath Pure Beta Crude Oil ETN
- OLGAX — JPMorgan Large Cap Growth A
- OLIT — OmniLit Acquisition Corp.
- OLITU — OmniLit Acquisition Corp.
- OLITW — OmniLit Acquisition Corp.
- OLK — Olink Holding AB (publ)
- OLLI — Ollie's Bargain Outlet Holdings, Inc.
- OLMA — Olema Pharmaceuticals, Inc.
- OLN — Olin Corporation
- OLO — Olo Inc.
- OLOX — Olenox Industries Inc
- OLP — One Liberty Properties, Inc.
- OLPX — Olaplex Holdings, Inc.
- OLVAX — JPMorgan Large Cap Value Fund Class A
- OLY.TO — Olympia Financial Group Inc.
- OM — Outset Medical, Inc.
- OM.TO — Osisko Metals Incorporated
- OM.V — Osisko Metals Incorporated
- OMAB — Grupo Aeroportuario del Centro Norte, S.A.B. de C.V.
- OMAH — VistaShares Target 15 Berkshire Select Income ETF
- OMC — Omnicom Group Inc.
- OMCIX — Oberweis Micro Cap Institutional
- OMCL — Omnicell, Inc.
- OMDA — Omada Health
- OME — Omega Protein Corp.
- OMEG — Omega Alpha SPAC
- OMER — Omeros Corporation
- OMEX — Odyssey Marine Exploration, Inc.
- OMF — OneMain Holdings, Inc.
- OMG.V — Omai Gold Mines Corp.
- OMGA — Omega Therapeutics, Inc.
- OMGNX — Invesco Main Street Fund
- OMH — Ohmyhome Limited
- OMI — Owens & Minor, Inc.
- OMI.TO — Orosur Mining Inc.
- OMI.V — Orosur Mining Inc.
- OMIC — Singular Genomics Systems, Inc.
- OMM.V — Omineca Mining and Metals Ltd.
- OMOAX — Vivaldi Multi-Strategy Fund
- OMOIX — Vivaldi Multi-Strategy Fund Class I
- OMP — Oasis Midstream Partners LP
- OMSE — OMS Energy Technologies Inc.
- OMSIX — Invesco Main Street Fund Class R6
- ON — ON Semiconductor Corporation
- ONAU.V — ONGold Resources Ltd.
- ONB — Old National Bancorp
- ONBPO — Old National Bancorp
- ONBPP — Old National Bancorp
- ONC — BeOne Medicines Ltd.
- ONC.TO — Oncolytics Biotech Inc.
- ONCH — 1RT Acquisition Corp.
- ONCHU — 1RT Acquisition Corp. Units
- ONCHW — 1RT Acquisition Corp. Warrant
- ONCO — Onconetix, Inc.
