Looking at the universe of stocks we cover at Dividend Channel, on 11/25/13, Valero Energy Corp. ( VLO) will trade ex-dividend, for its quarterly dividend of $0.225, payable on 12/18/13. As a percentage of VLO's recent stock price of $42.35, this dividend works out to approximately 0.53%, so look for shares of Valero Energy Corp. to trade 0.53% lower — all else being equal — when VLO shares open for trading on 11/25/13.Below is a dividend history chart for VLO, showing historical dividends prior to the most recent $0.225 declared by Valero Energy Corp.: In general, dividends are not always predictable; but looking at the history above can help in judging whether the most recent dividend from VLO is likely to continue, and whether the current estimated yield of 2.13% on annualized basis is a reasonable expectation of annual yield going forward. The chart below shows the one year performance of VLO shares, versus its 200 day moving average: Looking at the chart above, VLO's low point in its 52 week range is $30.56 per share, with $48.97 as the 52 week high point — that compares with a last trade of $42.42. According to the ETF Finder at ETF Channel, VLO makes up 5.48% of the Dynamic Energy Exploration & Production Portfolio ETF ( PXE) which is trading higher by about 0.5% on the day Thursday. In Thursday trading, Valero Energy Corp. shares are currently up about 0.6% on the day.