Shares of Hartford Financial (HIG) are up 8% to $62.07 and have been halted for volatility after Bloomberg headlines indicated that Chubb (CB) is exploring a possible takeover of its rival and is said to have made a preliminary takeover approach. Shares of other insurance names, including AIG (AIG), Allstate (ALL), Assurant (AIZ) and W. R. Berkley (WRB), have moved higher following Bloomberg’s report.