Analysts' Actions: DRH, VOLC, WPRT

NEW YORK ( TheStreet) -- CHANGE IN RATINGS

Diamond Rock Hospitality ( DRH) was downgraded at Goldman Sachs to sell from neutral. $7.75 price target. Exposure to difficult markets, Goldman Sachs said.

Volcano Corp. ( VOLC) was downgraded at JMP Securities to market underperform from market perform. $20 price target. Longer-term fundamentals of PCI market unlikely to reverse themselves, JPM Securities said.

Westport Innovations ( WPRT) was initiated with a sell rating at Goldman Sachs. $21 price target. Cummins JV set to terminate in 2021, Goldman said.

Stock Comments/EPS Changes

Express Scripts ( ESRX) numbers were cut at Citigroup. Shares are now seen reaching $62, Citigroup said. Estimates were also lowered after the company pulls forward 2013 EPS, Citi said. Neutral rating.

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This article was written by a staff member of TheStreet.