SunPower Corp.'s (NASDAQ: SPWR) short interest increased by 5.9% to 16.85 million shares, or 27.7% of the company's float. In the short interest period, the share price fell by 9.4%. The stock's 52-week range is $6.46 to $10.00, and it closed at $7.32 on Thursday, down about 1% for the day. Days to cover fell from 15 to nine.