Activist targets GM share structure, board

Investor David Einhorn unveiled a proposal Tuesday to try to boost General Motors share price by creating two classes of stock, signaling a possible battle at the carmaker's annual meeting.GM rejected the initiative, calling it risky, and said it also would fight a plan by Einhorn to nominate four candidates to the GM board.Shares of GM jumped on the Einhorn move, finishing up 2.5 percent at $35.56.