Looking at the universe of stocks we cover at Dividend Channel, on 12/10/13, Tsakos Energy Navigation Ltd. (TNP) will trade ex-dividend, for its quarterly dividend of $0.05, payable on 12/17/13. As a percentage of TNP's recent stock price of $5.28, this dividend works out to approximately 0.95%, so look for shares of Tsakos Energy Navigation Ltd. to trade 0.95% lower — all else being equal — when TNP shares open for trading on 12/10/13.Below is a dividend history chart for TNP, showing historical dividends prior to the most recent $0.05 declared by Tsakos Energy Navigation Ltd.: In general, dividends are not always predictable; but looking at the history above can help in judging whether the most recent dividend from TNP is likely to continue, and whether the current estimated yield of 3.79% on annualized basis is a reasonable expectation of annual yield going forward.The chart below shows the one year performance of TNP shares, versus its 200 day moving average: Looking at the chart above, TNP's low point in its 52 week range is $3.13 per share, with $5.75 as the 52 week high point — that compares with a last trade of $5.28. According to the ETF Finder at ETF Channel, TNP makes up 4.13% of the Guggenheim Shipping ETF ( SEA) which is trading higher by about 0.5% on the day Friday. According to Preferred Stock Channel, there is are 2 series of preferred stock that are senior to TNP — find out what they are ». In Friday trading, Tsakos Energy Navigation Ltd. shares are currently up about 0.6% on the day.