An activist investor could spark new growth for the major retailer.The past year has not been easy for Target (TGT +0.33%). The retailer endured slumping sales and lagged significantly behind its peers. At the time of this writing, its stock is down more than 27% over the past year and over 40% in the past five years. NYSE : TGTTargetToday's Change( 0.33 %) $0.32Current Price$ 97.75Key Data PointsMarket Cap$44BDay's Range$ 97.20 - $98.4452wk Range$ 83.44 - $ 145.08Volume4.3MAvg Vol7.4MGross Margin25.36 %D ...