Bluebird Bio downgraded By: MarketMinute.com Stock News December 07, 2015 at 13:12 PM EST Roth Capital downgraded Bluebird Bio (Nasdaq: BLUE) from a Buy rating to a Neutral rating and slashed its price target fro $121 to $62. The stock price plummeted $31.06 to $52.60. Related Stocks: Bluebird Bio