Looking at the universe of stocks we cover at Dividend Channel, on 12/18/13, GulfMark Offshore, Inc. ( GLF) will trade ex-dividend, for its quarterly dividend of $0.25, payable on 12/31/13. As a percentage of GLF's recent stock price of $46.52, this dividend works out to approximately 0.54%, so look for shares of GulfMark Offshore, Inc. to trade 0.54% lower — all else being equal — when GLF shares open for trading on 12/18/13.Below is a dividend history chart for GLF, showing historical dividends prior to the most recent $0.25 declared by GulfMark Offshore, Inc.: In general, dividends are not always predictable; but looking at the history above can help in judging whether the most recent dividend from GLF is likely to continue, and whether the current estimated yield of 2.15% on annualized basis is a reasonable expectation of annual yield going forward. The chart below shows the one year performance of GLF shares, versus its 200 day moving average: Looking at the chart above, GLF's low point in its 52 week range is $31.74 per share, with $53.89 as the 52 week high point — that compares with a last trade of $46.59. According to the ETF Finder at ETF Channel, GLF makes up 1.44% of the SPDR S&P Oil & Gas Equipment & Services ETF ( XES) which is trading higher by about 1% on the day Monday. In Monday trading, GulfMark Offshore, Inc. shares are currently up about 0.4% on the day.