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- OHBAYASHI CORPORATION
- Ohio Bell Telephone Company
- Ohio Casualty Corp.
- OIL AND NATURAL GAS COMMISSION
- Oil-Dri Corporation of America
- OJI PAPER CO., LTD.
- OJSC Wimm-Bill-Dann Foods
- OKI ELECTRIC INDUSTRY COMPANY, LIMITED
- OKLAHOMA GAS AND ELECTRIC COMPANY
- OKURA & CO., LTD.
- Olan Mills, Inc.
- Old America Stores, Inc.
- Old Dominion Freight Line, Inc.
- Old Kent Financial Corp.
- Old Mutual PLC
- Old National Bancorp
- Old Navy, Inc.
- Old Republic International Corporation
- Old Spaghetti Factory International Inc.
- Olin Corporation
- Olivetti S.p.A.
- Olympia & York Developments Ltd.
- OM Group, Inc.
- Omaha Steaks International Inc.
- OMI Corporation
- Omni Hotels Corp.
- Omnicare, Inc.
- Omnicom Group Inc.
- OmniSource Corporation
- OMNOVA Solutions Inc.
- Omron Corporation
- On Assignment, Inc.
- One Price Clothing Stores, Inc.
- Oneida Ltd.
- ONEOK Inc.
- Onex Corporation
- Onion, Inc.
- Ontario Hydro Services Company
- Ontario Teachers' Pension Plan
- Onyx Acceptance Corporation
- Onyx Software Corporation
- Opinion Research Corporation
- Oppenheimer Wolff & Donnelly LLP
- Opsware Inc.
- Option Care Inc.
- Opus Group
- Oracle Corporation
- Orange Glo International
- Orbital Sciences Corporation
- Orbitz, Inc.
- Orchard Supply Hardware Stores Corporation
- Ore-Ida Foods Incorporated
- Oregon Chai, Inc.
- Oregon Dental Service Health Plan, Inc.
- Oregon Metallurgical Corporation
- Oregon Steel Mills, Inc.
- Organic Valley (Coulee Region Organic Produce Pool)
- Organización Soriana, S.A. de C.V.
- Orion Oyj
- ORION PICTURES CORPORATION
- Orkla A/S
- Orleans Homebuilders, Inc.
- Orthodontic Centers of America, Inc.
- Orthofix International NV
- Oryx Energy Company
- Osaka Gas Company, Ltd.
- Oscar Mayer Foods Corp.
- OshKosh B'Gosh, Inc.
- Oshkosh Truck Corporation
- Oshman's Sporting Goods, Inc.
- Osmonics, Inc.
- ÖSTERREICHISCHE BUNDESBAHNEN GmbH
- ÖSTERREICHISCHE POST- UND TELEGRAPHENVERWALTUNG
- Otis Elevator Company, Inc.
- Otis Spunkmeyer, Inc.
- OTR Express, Inc.
- Ottakar's plc
- Ottaway Newspapers, Inc.
- Otter Tail Power Company
- Otto Versand (GmbH & Co.)
- Outback Steakhouse, Inc.
- Outboard Marine Corporation
- Outdoor Research, Incorporated
- Outdoor Systems, Inc.
- Outlook Group Corporation
- Outokumpu Oyj
- Outrigger Enterprises, Inc.
- Overhead Door Corporation
- Overhill Corporation
- Overnite Corporation
- Overseas Shipholding Group, Inc.
- Owens & Minor, Inc.
- Owens Corning Corporation
- Owens-Illinois, Inc.
- Owosso Corporation
- Oxford Health Plans, Inc.
- Oxford Industries, Inc.
- P & F Industries, Inc.
- P&C Foods Inc.
- P. F. Chang's China Bistro, Inc.