Short interest in PTC Therapeutics Inc (NASDAQ:PTCT) increased during the last reporting period, rising from 4.66M to 4.89M. This put 9.86% of the company's publicly available shares short.

Short interest for PTC Therapeutics gives investors a sense of the degree to which investors are betting on the decline of PTC Therapeutics's stock. Short interest data is updated every two weeks.

Based on the recent average volume of 755.01K shares traded per day, it would take 6.47 day(s) for holders of this short interest to close out their positions without sending the stock sharply higher.