Bluebird Bio's (BLUE) shares were down more than 11% in recent Friday trading after BofA Securities downgraded the company's stock to neutral from buy.
JPMorgan also downgraded the biotechnology company's stock to underweight from neutral.
Trading volume stood at about 7.9 million shares against a daily average of roughly 6.7 million.
Price: 0.32, Change: -0.04, Percent Change: -11.58