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Create free account to monitor VLOvalero energy corporation, through its subsidiaries, is an international manufacturer and marketer of transportation fuels and other petrochemical products. valero, a fortune 50 company based in san antonio, texas, with approximately 10,000 employees, is an independent petroleum refiner and ethanol producer, and its assets include 15 petroleum refineries with a combined throughput capacity of approximately 3. 1 million barrels per day and 11 ethanol plants with a combined production capacity of approximately 1.