Short interest in Prothena Corp PLC (NASDAQ:PRTA) increased during the last reporting period, rising from 6.79M to 7.53M. This put 22.07% of the company's publicly available shares short.

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

Based on the recent average volume of 472.31K shares traded per day, it would take 15.95 day(s) for holders of this short interest to close out their positions without sending the stock sharply higher.