Wartsila (OTCMKTS:WRTBY - Get Free Report) was the target of a large growth in short interest in the month of October. As of October 15th, there was short interest totaling 148,282 shares, a growth of 91.6% from the September 30th total of 77,380 shares. Currently, 0.0% of the company's shares are short sold. Based on an average trading volume of 332,890 shares, the short-interest ratio is currently 0.4 days.