It should be noted that the preferred shares are convertible, with a conversion ratio of 2.3033. The chart below shows the one year performance of WLL.PRA shares, versus WLL: Below is a dividend history chart for WLL.PRA, showing historical dividends prior to the most recent $1.5625 on Whiting Petroleum Corp's 6.25% Convertible Perpetual Preferred Stock: According to the ETF Finder at ETF Channel, Whiting Petroleum Corp ( NYSE: WLL ) makes up 1.48% of the SPDR S&P Oil & Gas Exploration & Production ETF (XOP) which is trading lower by about 1.7% on the day Monday. See what other ETFs contain WLL » See what other stocks are held by XOP » In Monday trading, Whiting Petroleum Corp's 6.25% Convertible Perpetual Preferred Stock ( NYSE: WLL.PRA ) is currently trading flat on the day, while the common shares ( NYSE: WLL ) are down about 2.1%.