Shares of General Motors Corp. rose more than 2 percent to $36.40 before the bell on Monday after Goldman Sachs raised its rating on the automaker to buy from neutral.

Shares of Yahoo Inc. rose 1.4 percent to $27.80 in electronic trade after news that the Internet media company is merging the two main parts of its U.S. advertising business following the resignation of sales executive Wenda Harris Millard.