The stock settled at $37.41 a share, rising 4.6% for the day and pushing the price up 2.2% year to date.
If it continues at that pace, this week will be one of the top five weeks of the year for the stock, according to FactSet data.
Several Wall Street analysts complimented GM during an investor presentation Wednesday about the Hummer EV, which debuted Tuesday night, but no major research firms have upgraded their price targets yet.
Prior to the Hummer's unveiling Tuesday night, BofA Securities' John Murphy said GM's "solid business plan" was not being reflected in its stock price.