Main Page | See live article | Alphabetical index Circle K is a trademark owned by the ConocoPhillips oil company to designate a chain of company operated and franchisedd convenience stores in the United States. Some of these stores operate gasoline pumps selling Union 76 branded motor fuels, others sell Mobil branded fuel. See also: Brands of gasoline. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.