Amarin (NASDAQ:AMRN) initiated with with Buy rating at Aegis. Shares up 1% premarket.
Tetraphase Pharmaceuticals (NASDAQ:TTPH) upgraded to Buy at Gabelli. Shares up 11% premarket.
PerkinElmer (NYSE:PKI) downgraded to Neutral with an $89 (1% upside) price target at Piper Jaffray.
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