Looking at the universe of stocks we cover at Dividend Channel, on 12/16/14, GulfMark Offshore, Inc. ( GLF) will trade ex-dividend, for its quarterly dividend of $0.25, payable on 12/29/14. As a percentage of GLF's recent stock price of $20.19, this dividend works out to approximately 1.24%, so look for shares of GulfMark Offshore, Inc. to trade 1.24% lower — all else being equal — when GLF shares open for trading on 12/16/14.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 4.95% 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 $20.01 per share, with $50.70 as the 52 week high point — that compares with a last trade of $20.16. According to the ETF Finder at ETF Channel, GLF makes up 1.89% of the SPDR S&P Oil & Gas Equipment & Services ETF ( XES) which is trading lower by about 2.1% on the day Friday. In Friday trading, GulfMark Offshore, Inc. shares are currently off about 3% on the day.