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The risk that a public company will face shareholder litigation stemming from an announced merger or acquisition is on the rise. According to Cornerstone Research, 91percent of deals valued at $100 million or greater from 2010 to 2011 resulted in lawsuits challenging those deals. The number of lawsuits challenging each deal also has grown from an average of 2.8 lawsuits per deal in 2007, to 6.2 lawsuits per deal in 2011, with lawsuits often filed in multiple jurisdictions.