Short interest in Prothena Corp PLC (NASDAQ:PRTA) increased during the last reporting period, rising from 7.88M to 8.06M. This put 23.59% 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 452.03K shares traded per day, it would take 17.82 day(s) for holders of this short interest to close out their positions without sending the stock sharply higher.