General Motors investors who have seen their shares tumble this year to the lowest price in more than a decade as the company's US market share for vehicle shares slumped from 27% to 25.4%, and have also had to watch GM's bond rating cut to "junk" status by two ratings firms as its losses topped $US1 billion in the first quarter, are hoping to hear of a comprehensive plan to turn around the company's fortunes at the annual shareholder meeting in Wilmington, Delaware on Tuesday, according to the Associated Press (AP).