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- O'Charley's Inc.
- O'Melveny & Myers
- O'Reilly Automotive, Inc.
- O'Sullivan Industries Holdings, Inc.
- O.C. Tanner Co.
- Oak Harbor Freight Lines, Inc.
- Oak Industries Inc.
- Oak Technology, Inc.
- Oakhurst Dairy
- Oakley, Inc.
- Oaktree Capital Management, LLC
- Oakwood Homes Corporation
- OAO LUKOIL
- OAO NK YUKOS
- OAO Siberian Oil Company (Sibneft)
- OAO Surgutneftegaz
- OAO Tatneft
- Obie Media Corporation
- Observer AB
- Occidental Petroleum Corporation
- Océ N.V.
- Ocean Spray Cranberries, Inc.
- Oceaneering International, Inc.
- Octel Communications Corp.
- Octel Messaging
- Ocular Sciences, Inc.
- Odakyu Electric Railway Co., Ltd.
- Odetics Inc.
- ODL, Inc.
- Odwalla, Inc.
- OEC Medical Systems, Inc.
- Office Depot, Inc.
- OfficeMax Inc.
- Officine Alfieri Maserati S.p.A.
- Offshore Logistics, Inc.
- Oglebay Norton Company
- OGLETHORPE POWER CORPORATION
- 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.