Shares of Valero ( VLO) were among the NYSE's winners Monday, rising 6% after the oil refiner posted strong third-quarter results and issued a fourth-quarter guidance that impressed investors. For the third quarter, the company earned $862 million, or $2.94 a share, on sales of $23.28 billion. Excluding items, the company would have earned $1.28 billion, or $4.37 a share. Analysts polled by Thomson First Call were expecting earnings of $4.23 a share on sales of $19 billion. A year earlier, the company earned $431 million, or $1.57 a share, on sales of $14.34 billion. Valero also said analysts' expectations for the fourth quarter are too low. "Given all these positive factors, it's clear that the current First Call consensus estimate of $3.67 per share for the fourth quarter is significantly too low. In fact, we estimate that in October alone we will earn around $2.30 per share," the company said. Separately, Valero said Bill Greehey will step down from his chief executive role at the end of the year to focus on his responsibilities as chairman. Bill Klesse, chief operating officer, will assume the CEO position on Jan. 1. "The timing couldn't be better," Greehey said regarding his role change. "At no point over the past 25 years has Valero achieved greater success than it has this year." Valero shares were trading up $5.94 to $105.44. Shares of Nam Tai Electronics ( NTE) fell 8% after the company posted solid third-quarter results but projected lower-than-expected fourth-quarter earnings. The company earned $18.8 million, or 43 cents a share, for the third quarter. Excluding items, the company's earnings rose to $15.3 million, or 35 cents a share, from $10.2 million, or 24 cents a share, a year earlier. Analysts were expecting earnings of 25 cents a share, before items. Nam Tai's sales grew to $207.9 million from $138 million a year earlier, and beat analysts' average estimate of $175 million.