Stratasys Ltd. ( SSYS ) saw short interest drop 2.9% in the first two weeks of December to 1.9 million shares, or about 5.1% of the company's float. Shares rose about 1.2% in the two-week period and closed at $130.33 Thursday, up about 60% for the year. The stock's 52-week range is $60.20 to $134.00.