We believe market (stock) sentiment should be evaluated two to three days after an announcement has been made to appropriately measure the response. GMX Resources (NYSE: GMXR) provided an operations update on the company’s Williston Basin and Niobrara operations after the market close on April 16, 2012. When the market opened on April 17, 2012, GMXR shares increased 5.5% to hit an intra-day high of $1.52 per share. At the time of writing this article, shares of GMXR were trading at $1.38, below the share price at the time of announcement. So wh...


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