Trading in Valero Energy Corp VLO stock is quiet on Wednesday. But that may not be the case for long. After gaining almost 40% since the April lows, many analysts and traders are anticipating some profit-taking. Stocks that are overbought and at resistance tend to sell off. This is why Valero is the Stock of the Day.Resistance is a large group of traders and investors looking to sell at or close to the same price. Resistance can stay intact for long periods of time. This has been the case with the $142.50 l ...