Short interest in bluebird bio Inc (NASDAQ:BLUE) decreased during the last reporting period, falling from 49.42M to 47.71M. This put 26.66% of the company's publicly available shares short.

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

Based on the recent average volume of 3.48M shares traded per day, it would take 13.7 day(s) for holders of this short interest to close out their positions without sending the stock sharply higher.