- OBT
- Orbital Corporation Limited
- ORC
- Orchid Island Capital, Inc.
- ONP
- Orient Paper, Inc.
- OESX
- Orion Energy Systems, Inc.
- OFI
- Overhill Farms, Inc.
- OEF
- ISHARES S&P 100 INDEX FD
- OPK
- Opko Health Inc
- ORS
- Orsus Xelent
- OKLH
- Spade Oklahoma
- OZRK
- Bank of the Ozarks
- ONEQ
- Fidelity Nasdaq Composite Index Tracking Stock
- OMAB
- Grupo Aeroportuario del Centro Norte S.A.B. de C.V.
- OIIM
- O2Micro International Limited
- OVLY
- Oak Valley Bancorp (CA)
- OBAF
- OBA Financial Services, Inc.
- OMPI
- Obagi Medical Products Inc
- OBCI
- Ocean Bio-Chem, Inc.
- OPTT
- Ocean Power Technologies, Inc.
- ORIG
- Ocean Rig UDW Inc.
- OSHC
- Ocean Shore Holding Co.
- OCFC
- OceanFirst Financial Corp.
- OCLR
- Oclaro, Inc.
- OFED
- Oconee Federal Financial Corp.
- OCLS
- Oculus Innovative Sciences, Inc.
- OCZ
- OCZ Technology Group Inc
- OMEX
- Odyssey Marine Exploration, Inc.
- OPAY
- Official Payments Holdings, Inc.
- OFS
- OFS Capital Corporation
- OVBC
- Ohio Valley Banc Corp.
- ODFL
- Old Dominion Freight Line, Inc.
- OLBK
- Old Line Bancshares, Inc.
- OPOF
- Old Point Financial Corporation
- OSBC
- Old Second Bancorp, Inc.
- OSBCP
- Old Second Bancorp, Inc.
- OFLX
- Omega Flex, Inc.
- OMER
- Omeros Corporation
- OABC
- OmniAmerican Bancorp, Inc.
- OMCL
- Omnicell, Inc.
- OVTI
- OmniVision Technologies, Inc.
- ONNN
- ON Semiconductor Corporation
- OTIV
- On Track Innovations Ltd
- OGXI
- OncoGenex Pharmaceuticals Inc.
- ONCY
- Oncolytics Biotech, Inc.
- ONTY
- Oncothyreon Inc.
- ONFC
- Oneida Financial Corp.
- ONVI
- Onvia, Inc.
- ONXX
- ONYX Pharmaceuticals, Inc.
- OTEX
- Open Text Corporation
- OPEN
- OpenTable, Inc.
- OPXA
- Opexa Therapeutics, Inc.
- OPLK
- Oplink Communications, Inc.
- OBAS
- Optibase Ltd.
- OCC
- Optical Cable Corporation
- OPTR
- Optimer Pharmaceuticals, Inc.
- OPHC
- OptimumBank Holdings, Inc.
- ORCL
- Oracle Corporation
- ORMP
- Oramed Pharmaceuticals Inc.
- OSUR
- OraSure Technologies, Inc.
- ORBC
- ORBCOMM Inc.
- ORBT
- Orbit International Corporation
- ORBK
- Orbotech Ltd.
- OSH
- Orchard Supply Hardware Stores Corporation
- ORLY
- O'Reilly Automotive, Inc.
- OREX
- Orexigen Therapeutics, Inc.
- ORIT
- Oritani Financial Corp.
- ORRF
- Orrstown Financial Services Inc
- OFIX
- Orthofix International N.V.
- OSIS
- OSI Systems, Inc.
- OSIR
- Osiris Therapeutics, Inc.
- OSN
- Ossen Innovation Co., Ltd.
- OTT
- OTELCO INC
- OTTR
- Otter Tail Corporation
- OUTD
- Outdoor Channel
- OVRL
- Overland Storage, Inc.
- OSTK
- Overstock.com, Inc.
- OXLC
- Oxford Lane Capital Corp.
- OXLCP
- Oxford Lane Capital Corp.
- OXGN
- OXiGENE, Inc.
- OXBT
- Oxygen Biotherapeutics, Inc.
- OSM
- SLM CORPORATION
- OKSB
- Southwest Bancorp, Inc.
- OKSBP
- Southwest Bancorp, Inc.
- OINK
- Tianli Agritech, Inc.
- ONVC
- ALEC BRADLEY CIGAR
- OAOFY
- O A O Tatneft
- OICO
- O I Cp
- OTMN
- O T Mining Corp
- OTOW
- O2 Secu Wireless
- OKME
- OAK RIDGE MICRO-ENERGY INC
- OAKR
- Oakridge Energy Inc
- OKRG
- Oakridge Holdings Inc
- OGZPY
- OAO GAZPROM ADR REGS
- OBNI
- Obn Holdings
- OCBG
- OC Beverages Inc
- OCNW
- Occam Networks
- OCENY
- Oce Nv Adr
- OCSM
- Ocean Smart Inc
- OCANF
- Oceanagold Corp
- OCNFD
- Oceanfreight
- OCCAF
- Oceania Capital
- OCEX
- Oceanic Exploration Co
- OCTI
- Octus
- ODMO
- Odimo Incorpor DEL < PK> ORD
- OOGI
- Odysey Oil Enrgy
- ODSY
- ODYSSEY HEALTHCARE INC
- OPIX
- Odyssey Pictures Corp
- ODXSF
- Odyssey Resources Ltd
- OEZVF
- Oesterreichische
- OERCF
- Oesterreichische Post AG
- OFEK
- Ofek Capital Corp
- OGXPY
- OGX Petroleo E Gas Participacoes SA
- OHPB
- Ohana Pacific Bank
- OART
- Ohio Art Co
- OLCB
- OHIO LEGACY CP
- OHIPO
- Ohio Power
- OHIPN
- Ohio Power Co
- OHIPM
- OHIO PWR CO PFD 4.50
- OSBI
- Ohio State Bancshares
- OHRP
- Ohr Pharmceuticl
- OISDF
- Oil Sands Sector Fd
- OISHY
- Oil Search Ltd Spon
- OILXF
- Oilexco Inc
- OJCB
- Ojai Community Bank
- OPYGY
- OJSC Polyus Gold
- OLMIF
- Olam International Ltd
- OLBG
- OLB GROUP INC
- OHBK
- Old Harbor Bank
- ODMTY
- Old Mutual PLC
- OLDW
- Oldwebsites.com Inc
- OLFC
- Olfactory Biosce
- OLVRF
- Olivut Res Ltd
- OCPNF
- Olympus Corp
- OCPNY
- Olympus Optical Co Ltd ADR
- OLYMF
- Olympus Pacific Minerals Inc
- OMHLF
- OM Holdings Ltd
- OMAG
- Omagine Inc
- ONAV
- Omega Navigation Enterprises Inc
- OMBP
- Omni Bio Pharma
- OMNI
- Omni Energy Services Corp
- OLOU
- OmniaLuo Inc
- OMCY
- Omnicity Corp
- OMCM
- Omnicomm Systems Inc
- OMMH
- Omnimmune Hold
- ORHI
- OmniReliant Holdings Inc
- OMTK
- OmniTek Engineering Corp
- OMRNY
- Omron Corp ADS
- OMTL
- Omtool Ltd
- OMVJF
- OMV AG
- ONCI
- On4 Comm
- OCLG
- Oncologix Tech
- OVIT
- Oncovista Invtve
- ONBI
- One Bio Corp
- OWDN
- One World Nutrition Inc
- OSCN
- Onescreen Inc
- ONEXF
- Onex Corp
- ORCC
- Online Resources Corp
- ONSE
- Onsite Energy Cp
- ONSM
- Onstream Media
- OKASY
- Onward Holdings Co Ltd
- OTES
- Op-Tech Envir
- OPWEF
- Opawica Exploration Inc
- OPELF
- Opel Intl Inc
- ONRGF
- Open Range Energy Corp
- OPTV
- Open Tv Cp Cl A
- OCBM
- OpenCell Biomed Inc
- OPNN
- Openlane Inc
- OPWV
- Openwave Systems
- OPESF
- Opera Software Asa
- OPESY
- Opera Software ASA
- OISI
- Ophthalmic Imaging Sys Inc
- OPNT
- OPNET TECHNOLOGIES INC
- OPXT
- Opnext Inc
- OSGFF
- OpSec Security Group PLC
- OPST
- OPT Sciences Corp
- OPTC
- Optelecom-Nkf
- OPXS
- Optex Systems Holdings Inc
- OPCDF
- OPTI CDA INC
- OPTI
- Opti Inc
- OCCF
- Optical Cable Corp
- OPMR
- Optimal Group A
- OPTZ
- Optimized Transportation Management Inc
- OPRX
- OptimizeRx Corp
- OSIN
- Optimum Source Intl Inc
- OPMC
- OptimumCare Corp
- OPNVY
- Option NV SA
- OPBL
- Optionable Inc
- OPMG
- Options Media Group Holdings Inc
- OXPS
- OPTIONSXPRESS HLDGS INC
- OPOSF
- OPTOS PLC
- ORNI
- ORAGENICS INC
- ORNG
- Orange 21
- OCBN
- Orange Community Bancorp
- OCBB
- ORANGE COUNTY BUSI BK NA (CA)
- OCBI
- ORANGE COUNTY TR MIDDLETOWN
- ORSDF
- Orascom Con
- ORSTF
- Orascom Telecom Sae
- ORFR
- Orbit /Fr Inc
- OECI
- Orbit E-Commerce
- OBTMY
- Orbital Corp Adr
- ORXGF
- Orca Exploration Group Inc
- ORCD
- Orchard Enterpri
- OCHT
- Orchestra Therapy
- ORCH
- Orchid Cellmark Inc
- ORCT
- Orckit Comm Ltd
- ORXE
- Ore Pharma Hldg
- ORBN
- Oregon Bancorp
- ORGG
- Oregon Gold Inc
- ORPB
- Oregon Pac Bncp
- ORXRF
- OREMEX RES INC
- ORXIF
- Orex Minerals Inc
- ORZCF
- Orezone Gold Corp
- ORGC
- Organic Alliance Inc
- ORRMF
- Organic Resource Management Inc
- OGSM
- Organic Sales and Marketing Inc
- ORGT
- Organitech Usa
- ORDNF
- Oridion Systems Ltd
- OROVY
- Orient Overseas International Ltd
- OFLMF
- Oriflame Cosmetics SA
- OFLMY
- Oriflame Cosmetics SA
- ORGN
- ORIGEN FINANCIAL INC
- OOIL
- OriginOil Inc
- OEHL
- Orion Ethanol
- ORNH
- Orion Healthcorp
- ORKLY
- Orkla A S A Shs
- OKOFF
- Orko Silver Corp
- OEXFF
- ORLEANS ENERGY LTD
- OHBIQ
- Orleans Home
- ORMT
- Ormet Corp
- OGRSF
- ORO GOLD RESOURCES
- OROSF
- Oro Silver Res Ltd
- OROCF
- Orocobre Ltd
- ORFG
- OROFINO GOLD CORP
- OLEPF
- Oromin Explrtns
- OROXF
- Orosur Mining Inc
- ORSUF
- Orsu Metals Corp
- ORVMF
- Orvana Minerals Corp
- OSBK
- Osage Bancshares
- OEDV
- Osage Exploration and Development Inc
- OSCUF
- Osaka Securities Exchange Co Ltd
- OSCIQ
- Oscient Pharm
- OSIIF
- Osi Geospatial
- OSKFF
- Osisko Mining Cp
- OLGX
- Osteologix Inc
- OSTE
- Osteotech Inc
- OSKA
- Osyka Corp
- OGLDF
- Otis Gold Corp
- OTIX
- Otix Global
- OTTW
- Ottawa Savings Bancorp Inc
- OTTRP
- Otter Tail $3.60
- OTTEF
- Otto Energy Ltd
- OPCO
- Ourpets Company
- OVLG
- Ovale Group
- OVCHY
- Oversea-Chinese Banking Corp Ltd
- OXBC
- Oxford Bank Corp
- OXIHF
- Oxford Investments Holdings Inc
- OXIS
- Oxis Interntnl
- OXUSF
- OXUS GOLD PLC ORD SHS
- OYOG
- Oyo Geospace Corp
- OZMLY
- Oz Minerals ADR
- OZMLF
- OZ Minerals Ltd
- OEZVY
- Verbund Ag Adr
- OFC
- Corporate Office Properties Trust
- OAKS
- Five Oaks Investment Corp.
- ONE
- Higher One Holdings, Inc.
- OIA
- Invesco Municipal Income Opportunities Trust
- OAK
- Oaktree Capital Group, LLC
- OAS
- Oasis Petroleum Inc.
- OXY
- Occidental Petroleum Corporation
- OII
- Oceaneering International, Inc.
- OZM
- Och-Ziff Capital Management Group LLC
- OCN
- Ocwen Financial Corporation
- ODP
- Office Depot, Inc.
- OMX
- Officemax Incorporated
- OGE
- OGE Energy Corporation
- OIBR
- Oi S.A.
- OIS
- Oil States International, Inc.
- ODC
- Oil-Dri Corporation Of America
- OILT
- Oiltanking Partners, L.P.
- ONB
- Old National Bancorp
- ORI
- Old Republic International Corporation
- OLN
- Olin Corporation
- OMG
- OM Group, Inc.
- OHI
- Omega Healthcare Investors, Inc.
- OME
- Omega Protein Corporation
- OCR
- Omnicare, Inc.
- OMC
- Omnicom Group Inc.
- OMN
- OMNOVA Solutions Inc.
- OLP
- One Liberty Properties, Inc.
- OB
- OneBeacon Insurance Group, Ltd.
- OKS
- ONEOK Partners, L.P.
- OKE
- ONEOK, Inc.
- OPY
- Oppenheimer Holdings, Inc.
- ORB
- Orbital Sciences Corporation
- OWW
- Orbitz Worldwide, Inc.
- OFG
- OFG Bancorp
- OEH
- Orient-Express Hotels Ltd.
- ORN
- Orion Marine Group Inc
- ORA
- Ormat Technologies, Inc.
- OSK
- Oshkosh Corporation
- OMI
- Owens & Minor, Inc.
- OC
- Owens Corning Inc
- OI
- Owens-Illinois, Inc.
- OXM
- Oxford Industries, Inc.
- OXF
- Oxford Resource Partners, LP
- O
- Realty Income Corporation
- OLE
- 9.25% Callable STRIDES Lnkd to Oracle
- OTR
- Claymore Ocean Tomo Growth Index
- OTP
- Claymore Ocean Tomo Patent ETF
- OTE
- Hellenic Telecommunications Organ
- OIB
- Invesco Municipal Incm Opprtnts Trst II
- OIC
- Invesco Municipal Incm Opprtnts Trst III
- OIL
- iPath S&P GSCI Crude Oil Tot Ret Idx ETN
- OIH
- OIL SERVICE HOLDERS TR 2041
- OLA
- OLD MUTUAL/CLAYMORE LONG-SHORT
- ONEF
- One Fund
- OOK
- OOK ETF
- OSG
- Overseas Shiphldg Grp
- OLO
- PowerShares DB Crude Oil Long
- OVIP
- Vimpelcom
- OGEN
- Oragenics, Inc.
- OMTH
- Omthera Pharmaceuticals, Inc.
- OCCH
- COCA COLA HELLENIC BOTTLING CO
- OVAS
- Ovascience Inc.
