Plug Power Inc. (NASDAQ: PLUG) saw short interest fall by 1.6% to 30.96 million shares. Days to cover fell to six and about 19.7% of the company's shares are short. In the two weeks to January 30, the stock's share price fell about 2.9%. The stock's 52-week range is $2.48 to $11.72, and shares closed Tuesday at $2.91.