- Occidental Petroleum Corporation
- Los Angeles, California based oil and gas exploration and production company. Also produces basic chemicals, plastics, and petrochemicals.
- Office Depot
- Provider of office supplies, furniture, and other related products. Site provides information on corporate affairs, shopping tools, and a store locator.
- OfficeMax
- Supplies office supplies and furniture as well as computers and other consumer electronics.
- OGE Energy Corporation
- Natural gas pipeline business and the parent company of the Oklahoma Gas and Electric Company (OG&E).
- Oil States International, Inc.
- Oil equipment and services company provides specialty products to the oil and gas drilling production industry.
- Old Republic International
- Insurance holding company engaged in general, commercial property and liability, mortgage guarantee, title, and workers' compensation insurance.
- Olin Corporation
- Clayton, Missouri based maker of copper and copper alloy sheets, strips, clad metal, foil, and stainless steel strips.
- Omnicare
- Covington, Kentucky based company provides services in skilled nursing, assisted living, and other healthcare facilities.
- Omnicom Group
- Corporate media services conglomerate that operates advertising, marketing, and public relations segments.
- Oneok
- Diversified oil and gas company based in Tulsa, Oklahoma - a rural natural gas distributor.
- Oracle Corporation
- Suppliers of software for business information management.
- O'Reilly Auto Parts
- Information on products and services, promotions, store locations, corporate governance, and investor relations.
- Oshkosh
- Truck corporation designs and builds specialty trucks and truck bodies.
- OSI Restaurant Partners, Inc.
- Operates casual-dining spots and steakhousesin over 1,400 locations in the United States and abroad.
- Overture
- Provides pay-for-performance search and information services.
- Owens & Minor
- Supply-chain solutions company and distributor of name-brand medical and surgical supplies.
- Owens Corning
- Company specializing in building materials such as insulation, roofing shingles, basement finishing, vinyl sliding, and fiberglass composites.
- Owens-Illinois, Inc.
- Glass container manufacturer with a market reach in Europe, North America, Asia Pacific and Latin America.
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