San Antonio-based refining company Tesoro Corp. is making financial history by reaching the highest stock prices in its 47 years of operation. Tesoro's (NYSE: TSO) stock price reached an all-time company high of $116.98 early Monday afternoon, which is exactly one week ahead of an expected Nov. 30 dividend date. The Monday afternoon stock price beat the company's previous record of $116.89, which was set on Nov.