- Oaktree Capital Group, LLC (OAK)
- Oasis Petroleum Inc. (OAS)
- Occidental Petroleum Corporation (OXY)
- Oceaneering International, Inc. (OII)
- Och-Ziff Capital Management Group LLC (OZM)
- Ocwen Financial Corporation (OCN)
- Office Depot, Inc. (ODP)
- Officemax Incorporated (OMX)
- OGE Energy Corporation (OGE)
- Oi S.A. (OIBR)
- Oi S.A. (OIBR-C)
- Oil States International, Inc. (OIS)
- Oil-Dri Corporation Of America (ODC)
- Oiltanking Partners, L.P. (OILT)
- Old National Bancorp Capital Trust I (ONB)
- Old Republic International Corporation (ORI)
- Olin Corporation (OLN)
- OM Group, Inc. (OMG)
- Omega Healthcare Investors, Inc. (OHI)
- Omega Protein Corporation (OME)
- Omnicare, Inc. (OCR)
- Omnicare, Inc. (OCR-PA)
- Omnicare, Inc. (OCR-PB)
- Omnicom Group Inc. (OMC)
- OMNOVA Solutions Inc. (OMN)
- On Assignment, Inc. (ASGN)
- One Liberty Properties, Inc. (OLP)
- OneBeacon Insurance Group, Ltd. (OB)
- ONEOK Partners, L.P. (OKS)
- ONEOK, Inc. (OKE)
- Open Joint Stock Company "Vimpel-Communications" (VIP)
- Opko Health Inc (OPK)
- Oppenheimer Holdings, Inc. (OPY)
- Orbital Sciences Corporation (ORB)
- Orbitz Worldwide, Inc. (OWW)
- Oriental Financial Group, Inc. (OFG)
- Oriental Financial Group, Inc. (OFG-PA)
- Oriental Financial Group, Inc. (OFG-PB)
- Oriental Financial Group, Inc. (OFG-PD)
- Orient-Express Hotels Ltd. (OEH)
- Orion Marine Group Inc (ORN)
- Orix Corp Ads (IX)
- Ormat Technologies, Inc. (ORA)
- Oshkosh Truck Corporation (OSK)
- Owens & Minor, Inc. (OMI)
- Owens Corning Inc (OC)
- Owens Corning Inc (OC-WS-B)
- Owens-Illinois, Inc. (OI)
- Oxford Industries, Inc. (OXM)
- Oxford Resource Partners, LP (OXF)
- O2Micro International Limited (OIIM)
- Oak Ridge Financial Services, Inc. (BKOR)
- Oak Valley Bancorp (CA) (OVLY)
- OBA Financial Services, Inc. (OBAF)
- Obagi Medical Products, Inc. (OMPI)
- Ocean Bio-Chem, Inc. (OBCI)
- Ocean Power Technologies, Inc. (OPTT)
- Ocean Rig UDW Inc. (ORIG)
- Ocean Shore Holding Co. (OSHC)
- OceanFirst Financial Corp. (OCFC)
- Oclaro, Inc. (OCLR)
- Oconee Federal Financial Corp. (OFED)
- Oculus Innovative Sciences, Inc. (OCLS)
- OCZ Technology Group Inc (OCZ)
- Odyssey Marine Exploration, Inc. (OMEX)
- Official Payments Holdings, Inc. (OPAY)
- OFS Capital Corporation (OFS)
- Ohio Valley Banc Corp. (OVBC)
- Old Dominion Freight Line, Inc. (ODFL)
- Old Line Bancshares, Inc. (OLBK)
- Old Point Financial Corporation (OPOF)
- Old Second Bancorp, Inc. (OSBC)
- Old Second Bancorp, Inc. (OSBCP)
- Olympic Steel, Inc. (ZEUS)
- Omega Flex, Inc. (OFLX)
- Omeros Corporation (OMER)
- OmniAmerican Bancorp, Inc. (OABC)
- Omnicell, Inc. (OMCL)
- OmniVision Technologies, Inc. (OVTI)
- ON Semiconductor Corporation (ONNN)
- On Track Innovations Ltd (OTIV)
- OncoGenex Pharmaceuticals Inc. (OGXI)
- Oncolytics Biotech, Inc. (ONCY)
- Oncothyreon Inc. (ONTY)
- Oneida Financial Corp. (ONFC)
- Online Resources Corporation (ORCC)
- Onvia, Inc. (ONVI)
- ONYX Pharmaceuticals, Inc. (ONXX)
- Open Text Corporation (OTEX)
- OpenTable, Inc. (OPEN)
- Opexa Therapeutics, Inc. (OPXA)
- Opexa Therapeutics, Inc. (OPXAW)
- Oplink Communications, Inc. (OPLK)
- Optibase Ltd. (OBAS)
- Optical Cable Corporation (OCC)
- Optimer Pharmaceuticals, Inc. (OPTR)
- OptimumBank Holdings, Inc. (OPHC)
- Oracle Corporation (ORCL)
- OraSure Technologies, Inc. (OSUR)
- ORBCOMM Inc. (ORBC)
- Orbit International Corporation (ORBT)
- Orbotech Ltd. (ORBK)
- Orchard Supply Hardware Stores Corporation (OSH)
- O'Reilly Automotive, Inc. (ORLY)
- Orexigen Therapeutics, Inc. (OREX)
- Origin Agritech Limited (SEED)
- Oritani Financial Corp. (ORIT)
- Orrstown Financial Services Inc (ORRF)
- Orthofix International N.V. (OFIX)
- OSI Systems, Inc. (OSIS)
- Osiris Therapeutics, Inc. (OSIR)
- Ossen Innovation Co., Ltd. (OSN)
- Otelco, Inc. (OTT)
- Otter Tail Corporation (OTTR)
- Outdoor Channel Holdings, Inc. (OUTD)
- Overland Storage, Inc. (OVRL)
- Overstock.com, Inc. (OSTK)
- Oxford Lane Capital Corp. (OXLC)
- Oxford Lane Capital Corp. (OXLCP)
- OXiGENE, Inc. (OXGN)
- Oxygen Biotherapeutics, Inc. (OXBT)
- Orbital Corporation Limited (OBT)
- Orchids Paper Products Company (TIS)
- Orient Paper, Inc. (ONP)
- Orion Energy Systems, Inc. (OESX)
- Overhill Farms, Inc. (OFI)
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