Looking at the universe of stocks we cover at Dividend Channel, on 5/5/15, Nordic American Tankers Ltd ( NAT) will trade ex-dividend, for its quarterly dividend of $0.38, payable on 5/21/15. As a percentage of NAT's recent stock price of $12.24, this dividend works out to approximately 3.10%, so look for shares of Nordic American Tankers Ltd to trade 3.10% lower — all else being equal — when NAT shares open for trading on 5/5/15.Below is a dividend history chart for NAT, showing historical dividends prior to the most recent $0.38 declared by Nordic American 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 NAT is likely to continue, and whether the current estimated yield of 12.42% on annualized basis is a reasonable expectation of annual yield going forward. The chart below shows the one year performance of NAT shares, versus its 200 day moving average: Looking at the chart above, NAT's low point in its 52 week range is $6.95 per share, with $13.15 as the 52 week high point — that compares with a last trade of $12.24. According to the ETF Finder at ETF Channel, NAT makes up 3.25% of the Guggenheim Shipping ETF ( SEA) which is trading up by about 0.1% on the day Friday. In Friday trading, Nordic American Tankers Ltd shares are currently up about 0.1% on the day.