- O2 Czech Republic as
- O2Micro International Limited
- Oaktree Capital Group, LLC
- Oando Energy Resources Inc.
- Oando PLC
- Oasis Petroleum Inc.
- Obara Group Inc.
- Obayashi Corp.
- Ober SA
- Oberoi Realty Limited
- OBI Pharma Inc.
- OBIC Business Consultants Co., Ltd.
- OBIC Co., Ltd.
- Obrascon Huarte Lain SA
- OC Oerlikon Management AG
- Ocado Group PLC
- Ocata Therapeutics Inc.
- Occidental Petroleum Corporation
- Ocean Rig ASA
- Ocean Shore Holding Co.
- Ocean Wilsons Holdings Limited
- Ocean Yield AS
- Oceana Group Limited
- OceanaGold Corporation
- Oceaneering International Inc.
- OceanFirst Financial Corp.
- Oceanside Capital Corp.
- Oceanwide Holdings Co., Ltd.
- Oceasoft SAS
- Ocera Therapeutics Inc.
- Och-Ziff Capital Management Group LLC
- OCI Co., Ltd
- OCI Materials Co., Ltd
- OCI NV
- OCI Partners LP
- OCI Resources LP
- OCK Group Bhd.
- OCL India Limited
- Octo Technology SA
- Octodec Investments Ltd.
- Ocular Therapeutix Inc.
- Oculus Innovative Sciences Inc.
- Ocwen Financial Corp.
- Odakyu Electric Railway Co., Ltd.
- Odas Elektrik Uretim Ve Sanayi Ticaret AS
- Odelic Co., Ltd.
- Odfjell Drilling Ltd.
- Odfjell SE
- Odontoprev S.A.
- OE Solutions Co., Ltd.
- OEkoworld AG
- Oeneo SA
- Office Depot Inc.
- Offshore Oil Engineering Co., Ltd.
- OFG Bancorp
- OFS Capital Corp,
- OGE Energy Corp.
- OHB AG
- OHL Mexico SAB de CV
- Ohr Pharmaceutical Inc.
- Ohsho Food Service Corp.
- Oi S.A.
- Oil & Gas Development Co., Ltd.
- Oil & Natural Gas Corp. Ltd.
- Oil India Limited
- Oil Search Limited
- Oil States International Inc.
- Oiles Corp.
- Oilex Ltd
- Oishi Group PCL
- Oisix Inc.
- Oji Holdings Corp.
- OK Zimbabwe Limited
- OKA Corporation Bhd.
- Okabe Co., Ltd.
- Okada Aiyon Corp.
- Okamura Corp.
- Okaya & Co., Ltd.
- O'Key Group S.A.
- OKI Electric Industry Co., Ltd.
- Okinawa Cellular Telephone Company
- Okinawa Electric Power Co Inc.
- Okmetic Oyj
- Okuma Corp.
- Okumura Corp.
- Olainfarm, Akciju Sabiedriba
- Olam International Limited
- Olav Thon Eiendomsselskap ASA
- Old Dominion Freight Line Inc.
- Old Line Bancshares Inc.
- Old National Bancorp
- Old Second Bancorp Inc.
- Oldtown Bhd.
- Olin Corp.
- Olvi Oyj
- Olympic Entertainment Group AS
- Olympic Steel Inc.
- Olympus Corp.
- OM Asset Management Plc
- OM Group Inc.
- Oman Cables Industry SAOG
- Oman Telecommunications Co.
- Omaxe Limited
| - Omega Diagnostics Group PLC
- Omega Healthcare Investors Inc.
- Omega Protein Corp.
- Omeros Corp.
- OMG plc
- Omkar Speciality Chemicals Limited
- Omnia Holdings Limited
- Omnicare Inc.
- Omnicell Inc.
- Omnicom Group Inc
- OmniComm Systems Inc.
- Omnitek Engineering Corp.
- OmniVision Technologies Inc.
- OMNOVA Solutions Inc.
- OMRON Corporation
- OMV AG
- OMV Petrom SA
- On Assignment Inc.
- On Deck Capital, Inc,
- ON Semiconductor Corp.
- On Time Logistics Holdings Ltd.
- On Track Innovations Ltd.
- On-Bright Electronics Co., Ltd.
- Oncodesign SA
- OncoGenex Pharmaceuticals Inc.
- Oncolys BioPharma Inc.
- Oncolytics Biotech Inc.
- OncoMed Pharmaceuticals Inc.
- Onconova Therapeutics Inc.
- OncoSec Medical Inc.
- OncoTherapy Science Inc.
- One Gas Inc.
- One Horizon Group Inc.
- One Liberty Properties Inc.
- One Media iP Group Plc
- One Tech Holding SA
- ONEOK Inc.
- ONEOK Partners, L.P.
- OneREIT
- OneSavings Plc
- Onex Corp.
- Only World Group Holdings Bhd.
- OnMobile Global Limited
- Ono Pharmaceutical Co., Ltd.
- Ontex Group N.V.
- Onward Holdings Co., Ltd.
- Onxeo SA
- oOh!media Ltd.
- Ooredoo QSC
- Ooredoo SAOG
- Opcon AB
- Open House Co., Ltd.
- Open Text Corporation
- OpenLimit Holding AG
- Opera Software ASA
- Opexa Therapeutics Inc.
- OPG Power Ventures Plc
- Ophir Energy plc
- Ophthotech Corp.
- OPKO Health Inc.
- Opower Inc.
- Oppenheimer Holdings Inc.
- Opsens Inc.
- OPT Holding Inc.
- Optex Co., Ltd.
- Optics Valley Union Holding Co., Ltd.
- Optimal Payments Plc
- OptimizeRx Corp.
- Option NV
- Opus Bank
- Opus Group AB
- Opus International Consultants Limited
- Oracle Corporation
- Oracle Corporation Japan
- Oracle Financial Services Software Limited
- Oramed Pharmaceuticals Inc.
- Orange Polskiej S.A.
- Orange SA
- Orapi SA
- Orascom Construction Ltd.
- OraSure Technologies Inc.
- Orava Residential REIT Plc
- ORBCOMM Inc.
- Orbis S.A.
- Orbit Exports Ltd
- Orbital ATK Inc.
- Orbital Corp. Ltd.
- Orbite Technologies Inc.
- Orbitz Worldwide Inc.
- Orbotech Ltd.
- Orchid Island Capital Inc.
- Orchids Paper Products Company
- Ordina N.V.
- O'Reilly Automotive Inc
- Orexigen Therapeutics Inc.
- Orexo AB
- Orezone Gold Corp.
- ORG Packaging Co., Ltd.
- Organizacion Cultiba SAB de CV
- Organizacion Soriana SAB de CV
- Organovo Holdings Inc.
- Orica Limited
- Orient Bell Limited
| - Orient Cement Ltd.
- Orient Overseas (International) Limited
- Orient Refractories Limited
- Orient Securities Co., Ltd.
- Oriental Bank of Commerce Limited
- Oriental Carbon & Chemicals Ltd
- Oriental Energy Co., Ltd.
- Oriental Holdings Bhd.
- Oriental Land Co., Ltd.
- Oriental Union Chemical Corp.
- Oriental Watch Holdings Limited
- Oriental Weavers Group
- Oriflame Holding AG
- Origin Electric Co., Ltd.
- Origin Energy Limited
- Origin Enterprises Plc
- Oriola-KD Oyj
- Orion Corp.
- Orion Energy Systems Inc.
- Orion Engineered Carbons SA
- Orion Health Group Ltd.
- Orion Marine Group Inc.
- Orion Oyj
- ORIOR AG
- Oritani Financial Corp.
- ORIX Corp.
- ORIX JREIT Inc.
- Orkla ASA
- Ormat Technologies Inc.
- Orocobre Limited
- Orolia SA
- Orora Ltd.
- Orotongroup Limited
- Orpea SA
- Orrstown Financial Services Inc.
- Orthofix International NV
- Oryx Petroleum Corp., Ltd.
- Oryx Properties Limited
- Osage Exploration and Development Inc.
- Osaka Gas Co., Ltd.
- OSAKA STEEL CO., LTD.
- OSAKA Titanium Technologies Co., Ltd.
- Osaki Electric Co., Ltd.
- Oscar Properties Holding AB
- Oscotec Inc.
- OSG Corp.
- Oshkosh Corp.
- OSIM International Ltd
- Osiris Therapeutics Inc.
- Osisko Gold Royalties Ltd.
- Oslo Bors VPS Holding ASA
- Osprey Medical Inc
- OSRAM Licht AG
- Osstem Implant Co., Ltd.
- Ossur hf.
- Osterreichische Post AG
- OTC Markets Group Inc.
- Otokar Otomotiv ve Savunma Sanayi A.S.
- Otonomy, Inc,
- OTP Bank Nyrt
- Otsuka Corp.
- Otsuka Holdings Co., Ltd.
- Otsuka Kagu, Ltd.
- Otter Tail Corp.
- Otto Energy Limited
- OTTO Marine Limited
- Ottogi Corp.
- OUE Commercial REIT
- OUE Hospitality Trust
- OUE Ltd
- Ourgame International Holdings Ltd.
- Ouro Fino Saude Animal Participacoes SA
- Ourpalm Co., Ltd.
- Outerwall Inc.
- OUTFRONT Media Inc.
- Outokumpu Oyj
- Outotec Oyj
- Outsourcery plc
- OUTSOURCING Inc.
- OvaScience Inc.
- OVB Holding AG
- Oversea-Chinese Banking Corp. Ltd.
- Overseas Education Ltd
- Overseas Realty (Ceylon) Ltd.
- Overseas Shipholding Group Inc.
- Overstock.com Inc.
- Ovivo Inc.
- Ovostar Union N.V.
- OVS SpA
- Owens & Minor Inc.
- Owens Corning
- Owens-Illinois Inc.
- Oxford BioMedica plc
- Oxford Immunotec Global Plc
- Oxford Industries Inc.
- Oxford Instruments plc
- Oxford Pharmascience Group plc
- OXiGENE Inc.
- OxySure Systems Inc.
- OZ Minerals Limited
- Ozforex Group Ltd.
- Ozner Water International Holding Ltd.
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