Click to view a price quote on SSREY. : Swiss Re AG  (SSREY) shares surged higher in Zurich Thursday after the reinsurance giant said it was considering selling a portion of its business to Japan's SoftBank Group Co. (SFTBY) , which is run by billionaire investor Masayoshi Son. The Zurich-based group confirmed portions of an earlier report by the Wall Street Journal that suggest Son's Softbank could take as much as a third of the group's equity, a deal that would be worth around $10 billion based on last night's closing price of Sfr90.24 per Swiss Re share.