Looking at the universe of stocks we cover at Dividend Channel, on 5/16/13, Teekay Tankers Ltd ( TNK) will trade ex-dividend, for its quarterly dividend of $0.03, payable on 5/28/13. As a percentage of TNK's recent stock price of $2.57, this dividend works out to approximately 1.17%, so look for shares of Teekay Tankers Ltd to trade 1.17% lower — all else being equal — when TNK shares open for trading on 5/16/13.Below is a dividend history chart for TNK, showing historical dividends prior to the most recent $0.03 declared by Teekay Tankers Ltd: In general, dividends are not always predictable; but looking at the history above can help in judging whether the most recent dividend from TNK is likely to continue, and whether the current estimated yield of 4.67% on annualized basis is a reasonable expectation of annual yield going forward. The chart below shows the one year performance of TNK shares, versus its 200 day moving average: Looking at the chart above, TNK's low point in its 52 week range is $2.38 per share, with $4.82 as the 52 week high point — that compares with a last trade of $2.57. According to the ETF Finder at ETF Channel, TNK makes up 3.95% of the Guggenheim Shipping ETF ( SEA) which is trading lower by about 0.3% on the day Tuesday. In Tuesday trading, Teekay Tankers Ltd shares are currently up about 0.4% on the day.