shares of assurant inc aiz dropped 077 to 12884 tuesday on what proved to be an allaround mixed trading session for the stock market with the dow jones industrial average djia rising 031 to 3373396 and the sp 500 index spx falling 007 to 401695 the stocks fall snapped a twoday winning streak assurant inc closed 6528 below its 52week high 19412 which the company achieved on april 21st the stock underperformed when compared to some of its competitors tuesday as berkshire hathaway inc cl a